1

2010 Intern Report

Global Specialist in energy management —— Make the most of your energy

2

Name： Ying Xiao

School： Wuhan Institute of Technology

Major： Electrical Automation

Intern Time：5th July 2010 -5th October 2010

Intern Location：Schneider Electric (China) Investment

Co.,Ltd.Wuhan Branch

Intern Position：Project，Equipment & Service engineer

3

Table of Contents ChapterⅠLearn Section ................................................................................................................ 5

1.1 Learn the background of Schneider Electric .......................................................... 51.1.1 Schneider Electric’s Profile ................................................................................. 51.1.2 Schneider Electric in China ................................................................................. 61.1.3 Schneider Electric’s Major projects in China .................................................... 81.1.4 The specific divisions in China and PES department ................................... 10

1.2 Learn some main products and related knowledge .................................................. 131.2.1 Masterpact NT/NW ............................................................................................. 131.2.2 Compact NSX ..................................................................................................... 161.2.3 EV12s ................................................................................................................... 171.2.4 Varlogic NR6/12,NRC12 .................................................................................... 181.2.5 AccuSine .............................................................................................................. 201.2.6 ATV ....................................................................................................................... 231.2.7 ATS ....................................................................................................................... 241.2.8 The products in Installation Systems & Control ............................................. 261.2.9 Safety Kit and related knowledge .................................................................... 311.2.10 Learn how to use SAP software ..................................................................... 341.2.11 Learn the basic method to read Electric Circuit Diagram ........................... 34

ChapterⅡ Practice Section ........................................................................................................ 352.1 Arrow-capacitor investigation------FiberHome distribution substation & Central Southern China Electric Power Institute ........................................................................... 352.2 SK installation------Yihaikerry(Wuhan) Investment Co., Ltd. ................................... 382.3 Organizing and doing statistics for Arrow-capacitor service ................................... 392.4 Setting and commissioning Varlogic NR6 ------Carrefour(Wuhan) Erqi Supermarket .......................................................................................................................... 402.5 Repairing the circuit breaker Evolis ------Wuhan Light rail ....................................... 412.6 Checking the reason of Masterpact MT circuit breaker’s burnout and complete investigation ------Wuhan Cigarette Factory ..................................................................... 422.7 Commissioning the Trip units of Masterpact MT ------ The Cancer Center of Union Hospital Wuhan ......................................................................................................... 432.8 Checking the reason of non-indication of Trip units of Masterpact MT circuit breaker ------Hubei XiSai Mountain power plant .............................................................. 472.9 Removing leakage protection of Masterpact MT circuit breaker ------ Hutchinson (Wuhan) rubber Investment Co., Ltd. ................................................................................ 492.10 Utilizing AutoCAD to draw the diagram of Converter Transform project ............. 50

Chapter Ⅲ Conference Section ............................................................................................... 523.1 Regular meeting and group discussion ...................................................................... 523.2 Arrow-capacitor service telephone conference ......................................................... 523.3 Central、South and Southwestern China Business Development conference ... 533.4 The spare parts contract between Dongfeng PEUGEOT CITROEN Automobile Company Ltd and Schneider Electric ................................................................................ 53

Chapter Ⅳ Intern Reflections ................................................................................................... 55

4

5

ChapterⅠLearn Section

1.1 Learn the background of Schneider Electric

1.1.1 Schneider Electric’s Profile

As a global specialist in energy management with operations in more than 100 countries, Schneider Electric offers integrated solutions across multiple market segments, including leadership positions in energy and infrastructure, industrial processes, building automation, and data centers/networks, as well as a broad presence in residential applications. Focused on making energy safe, reliable, and efficient, the company's 100,000+ employees achieved sales of more than 15.8 billion euros in 2009, through an active commitment to help individuals and organizations “Make the most of their energy”.

19th Century

• 1836: The Schneider brothers took over the Creusot foundries. Two years later, they created Schneider & Cie..

6

• 1891: Having become an armaments specialist, Schneider innovated by launching itself into the emerging electricity market.

First half of 20th century

• 1919: Installation of Schneider in Germany and Eastern Europe via the European Industrial and Financial Union (EIFU). In the years that followed, Schneider associated with Westinghouse, a major international electrical group. Post war: Schneider gradually abandoned armaments and turned to construction, iron and steel works and electricity. The company was completely reorganised in order to diversify and open up to new markets.

Late 20th century

• 1981-1997: Schneider Group continued to focus on the electrical industry by separating from its non-strategic activities. This policy was given concrete form through strategic acquisitions by Schneider Group: Telemecanique in 1988, Square D in 1991 and Merlin Gerin in 1992.

• 1999: Development of Installation, Systems and Control with the acquisition of Lexel, Europe’s number two in electrical distribution. In May 1999 the Group was renamed Schneider Electric, to more clearly emphasize its expertise in the electrical field. The Group engaged in a strategy of accelerated growth and competitiveness.

• 2000-2009: Period of organic growth, positioning itself in new market segments: UPS (uninterruptible power supply), movement control, building automation and security through acquisitions of APC, Clipsal, TAC, Pelco, Xantrex, and more.

1.1.2 Schneider Electric in China

Schneider Electric is a top Global 500 company, and has been advancing and innovating aggressively over the course of more than 170 years. Schneider Electric is now the global specialist in energy management. Since the establishment of its first joint-venture plant in Tianjin in 1987, Schneider Electric has established a strong foothold in the market, and has grown together with the Chinese economy. It has witnessed different phases in China’s growth over the past more 20 years, and has made it a part of its own mission to contribute to a sustainable development of the Chinese economy. Contribution As of 2009 Schneider Electric had, 77 offices, 22 factories, one learning

7

institute, two research and development centers and one laboratory. Presently, Schneider Electric has 15,000 employees, 500 distributors and a nation-wide sales network, creating many further job opportunities. By the end of 2007, China has become second largest market. Innovation In order to enhance innovation within the local market, Schneider Electric has been continuously developing its R&D force in China. Each year, it invests about 5% of its sales revenue into R&D. So far, it has established two research & development centers in China, with 440 professional engineers. Social Responsibility Schneider Electric’s Luli program, has donated RMB 6.2 million, Schneider Electric also helped set up 7 Hope Primary Schools, 2 orphanages and 1 special education school. Through its university partnership program, Schneider Electric has donated RMB 18 million worth of equipment to local universities in China, improving the overall quality of education through R&D programs, talent fostering (internships, employment opportunities, campus talks etc) and infrastructure (courses, textbooks, and training). More than 20 years of successful local partnership Schneider Electric produces in China for both the local and international markets in its 22 local production facilities. It has been growing together for more 20 years with its 500 local distributors, 5,000 local suppliers and 1,000 technology integrators, and has localized its research and product development with two R&D centers in China. Furthermore, Schneider Electric in China has a highly localized staff - up to 99% - at all levels of the company, including top management.

8

1.1.3 Schneider Electric’s Major projects in China

9

10

1.1.4 The specific divisions in China and PES department

Schneider Electric is divided into twelve departments: HR Intranet、SLIC、

11

Power&Energy BU、Power Engineering China、Automation Offer Creation China、IS Division、Quality、Finance、IT、Marketing and PES. PES department is short for Project, Equipment & Service.

The main mission in Our department is to let end customer to make the most of their energy, save energy and increase efficiency is our permanent goal. From visiting customer, Walking through and offering potential savings assessment to presenting quick wins solutions; From initial energy performance level, initial consulting to extended services. These parts all demonstrate our professionalism. Moreover, we are here to offer end customers a series of after-sale service and consulting.

12

13

1.2 Learn some main products and related knowledge

1.2.1 Masterpact NT/NW

Figure 1-1: Masterpact NT/NW

Brief introduction

--The original Masterpact has set a new standard for power circuit breakers around the world. --In addition to the traditional features of power circuit breakers(withdraw ability, discrimination and low maintenance), Masterpact now offers built-in communications and metering functions, all in optimized frame sizes -- Masterpact NT, the world’s smallest true power circuit breaker, with ratings from 630 to 1600 A --Masterpact has many patents (Filtered breaking, automatic unlatching, “double setting” system for protection functions) This brief introduction is the classical summary for Masterpact MT/MTE in my part. And as far as I am here, the majority of customers bought this type of circuit breaker. So I would like to demonstrate it more sophisticatedly.

Main features of Masterpact NT and NW:

1、Five performance levels（N1\H1\H2\H3\L1） 2、3 frame sizes, 2 families

14

The range of power circuit breakers includes two families: Masterpact NT, the world’s smallest true power circuit breaker, with ratings from 630 to 1600 A Masterpact NW, in two frame sizes, one from 800 to 4000 A and the other from 4000 A to 6300 A. 3、Optimized Volume: Masterpact NT innovates by offering all the performance of a power circuit breaker in an extremely small volume. 4、Ease of installation With optimized sizes, the Masterpact NT and NW ranges simplify the design of switchboards and standardize the installation of devices. 5、Greater safety and dependability More patents: Filtered breaking, automatic unlatching, Protection functions are separate from the measurement functions and are managed by an ASIC electronic component. A patented “double setting” system for protection functions. 6、Ready for the future Considering the impact of environment, simple upgrading of installation.

Micrologic control units in Masterpact NT and NW:

All Masterpact circuit breakers are equipped with a Micrologic control unit that can be changed on site. Control units are designed to protect Power circuits and loads. Alarms may be programmed for remote indications. Measurements of current, voltage, frequency, power and power quality optimize continuity of service and energy management. Integration of protection functions in an ASIC electronic component used in all Micrologic control units guarantees a high degree of reliability and immunity to conducted or radiated disturbances. On Micrologic A, P and H control units, advanced functions are managed by an independent microprocessor. Micrologic A control units protect power circuits. They also offer measurements, display, communication and current maximeters. Version 6 provides earth-fault protection, version 7 provides earth-leakage protection. Micrologic P control units include all the functions offered by Micrologic A. In addition, they measure voltages and calculate power and energy values. They also offer new protection functions based on currents, voltages, frequency and power reinforce load protection in real time. Micrologic H control units include all the functions offered by Micrologic P. Integrating significantly enhanced calculation and memory functions, the

15

Micrologic H control unit offers in-depth analysis of power quality and detailed event diagnostics. It is intended for operation with a supervisor.

Figure 1-2 Current Protection of Micrologic Control units

16

1.2.2 Compact NSX

Figure 1-3 Compact NSX

Compact NSX is the next-generation circuit breaker.

A power monitoring unit enhances their invariably impeccable protective functions. For the first time, users can monitor both energy and power, offering new performance in a remarkably compact device.

• Integrated monitoring • New breaking selectivity • 100% installation safety • Efficient communication network

17

1.2.3 EV12s

Figure 1-4 EV12s

EV12s is the latest design of Schneider Electric in France, it meets the demand of GB,DL standards in China. Indoor circuit breaker EV12s, which is assembled in China, can ensure the feasibility and quality of the advance technology by the supervision of France Schneider Electric. It can be widely used in medium power distribution network in the areas of energy and fundamental infrastructure，industry，business and household buildings. Especially for the high/medium, medium/medium or medium/low substations.

18

1.2.4 Varlogic NR6/12,NRC12

Figure 1-5 Varlogic NR6/12, NRC12

The Varlogic controllers permanently measure the reactive power of the installation and control connection and disconnection of capacitor steps to obtain the required power factor. The range is composed of:

• NR6 control up to 6 capacitor steps • NR12 control up to 12 capacitor steps • NRC12 control up to 12 capacitor steps and offer more functions and

the Modbus communication option They simplify the installation, supervision and maintenance of reactive power compensation equipment

Product feature: Simplicity, Reliability, Intelligence Simplicity:

• easy to read display about various parameters and measured data, scanning the menu and alarm indicator

• intuitive man/machine dialogue

Peace of mind:

• direct display of network and capacitor bank step characteristics

Flexibility:

• automatic programming and commissioning, regardless of the polarity and phase sequence of the current transformer.

19

• communication option Modbus RS485 network (compatible Transparent Ready) Varlogic NRC12 can connect the communication module to realize the remote communication.

The following two diagrams are the Line-to-neutral and Line-to-Line connection of NR12 as an example:

Figure 1-6 Line-to-neutral Connection and Line-to-Line connection of NR12

20

1.2.5 AccuSine

Figure 1-7 AccuSine PCS & AccuSine 3L/4L

The AccuSine PCS is a power electronic converter utilizing analog and digital logic to inject corrective current for harmonic currents, from the 2nd to the 50th orders, and for reactive current to correct displacement power factor. If sized properly for both harmonics and power factor correction, AccuSine PCS can improve the total power factor as seen by the utility grid to near unity. An AccuSine version which only injects corrective currents for harmonic currents of odd harmonics up to the 25th order. The power components of AccuSine PCS, see Figure 1-8, consist of line fuses, pre-charge contactor, carrier frequency filter, power converter, and bus capacitors. Control logic is not shown.

21

Figure 1-8 AccuSine Power Circuit The input fuses are sized for the rated AccuSine PCS output current. The fuses will disconnect AccuSine PCS from the AC lines in the event that the unit malfunctions. The fuses are Class T rated at 200,000 AIC (amperes of interrupting capacity) for use on virtually any plant electrical system. Upon application of power, the pre-charge contactor delays actuation until the DC bus capacitors are sufficiently charged to prevent inrush damage to the DC bus capacitors. This may take up to eight seconds. Once the DC bus voltage has reached the operating voltage, the pre-charge contactor closes to permit operation. This contactor will remain closed during all stop and fault conditions. It will open with a delay only upon removal of power or if the main input fuses blow. The carrier frequency at which the power devices of AccuSine PCS are operating is blocked from entering the AC-lines by a tuned filter circuit which consists of inductors and capacitors on the filter PCB. The power converter performs two functions. One function is to control the voltage on the bus capacitors by utilizing the diodes of the IBGT, S1 through S6, shown in Figure 1-7. The second function is to return power to the AC lines in a manner that cancels harmonic current and corrects poor power factor (PF) caused by the loads to be corrected. The logic on the Control PCB dictates the firing sequence based upon the data received. Using the current transformers and the AC lines connection, AccuSine PCS measures the power factor of the load. When PF Mode is activated, AccuSine PCS injects reactive current up to its rated total current capacity to bring the displacement power factor (DPF) to the desired level. The rated output current of AccuSine PCS is equal to the rms-sum of the harmonic and reactive current injected. The following table provides a representation of this relationship. All values in percent of rated output current.

Table 1-1: Dual Mode Output Percentages

The following formula is used to calculate this current relationship:

2 2AS h rI I I= +

Where IAS is the total output current of AccuSine PCS, Ih is the injected harmonic current of AccuSine PCS, and Ir is the injected reactive current of AccuSine PCS.

22

Use these percentages to determine the amount of current available for each function. Multiply the above percentage with the AccuSine PCS rated current to obtain the approximate amount of correction provided by AccuSine PCS for each function. AccuSine PCS is installed directly on the AC lines in parallel to the harmonic producing load(s), see figure 1-8. For three phases, three wire AC power systems, two current transformers (CT) are placed on phases A and B to provide the logic with a representation of the load current. The AccuSine PCS logic then deducts the fundamental frequency (50 or 60 Hertz) from this signal. At this point the logic inverts the remaining signal and directs the firing of the IGBT to duplicate the inverted signal. The result is a cancellation of the current harmonics for the upstream electrical system. A low level of harmonic distortion will remain. If the AccuSine PCS has been selected to meet or exceed the total harmonic current produced by the load(s), then the remaining total harmonic current distortion will be less than 5% TDD. (total demand distortion as defined by IEEE 519-1992). This also assures that the total harmonic voltage distortion [THDv] caused by these loads will be much lower than 5% up stream of the AccuSine PCS location. If single phase line-to-neutral connected loads are present on the same bus, a third CT is required on phase C, and the parameter “4Wire System” has to be activated in the Setup Menu. When operating on a 4-wire system, AccuSine PCS will correct for all harmonics caused by line-to-line connected loads. However, 33% of the harmonic current flowing in the neutral line will remain on the phase currents. Therefore, in this special case a TDD of more than 5% may remain. Due to functions designed into the logic of AccuSine PCS, the IGBT cannot be overloaded. The total rms current output of AccuSine PCS is monitored and limited to 100% of the AccuSine current rating. The “At max. capacity” relay will be activated if output current attains these levels and the message “At max. capacity, Iout > 95%” appears on the display. As a result, if the total harmonic current present on the AC lines exceeds the total current rating of AccuSine PCS, the total harmonic current distortion may exceed 5%. In addition, the logic of AccuSine PCS will automatically reduce the total output current of AccuSine PCS if the IGBT temperature exceeds its rated operating level. This may happen if the ambient temperature exceeds the specified limit; if insufficient airflow is provided to a chassis mount unit; or a door fan stops operating. The “Fault” relay will be activated in this case, and the message “Thermal Limit” will appear on HMI. The unit will continue to run, however, until either the ambient temperature decreases which allows the unit to restart or the unit shuts down due to an “Over- Temperature” fault. In either case, the unit will resume operation as soon as the internal temperatures have decreased sufficiently.

23

Note the alternate placement for the CT in Figure 1-8. In this case the CT are on the source side of the AccuSine PCS power connections to the AC lines. The function is the same. However, the harmonic distortion will be effectively cancelled on the source side of the CT and not at the AccuSine PCS power connection point.

Figure1-9 Installation one-line diagram

1.2.6 ATV

24

Figure 1-10 ATS 61 The Altivar 61 drive is a frequency inverter for 0.75 kW to 800 kW three-phase asynchronous motors. It has been designed for state-of-the-art applications in heating, ventilation and air conditioning (HVAC) in industrial and commercial buildings: ventilation, air conditioning, pumping The Altivar 61 can reduce operating costs in buildings by optimizing energy consumption whilst improving user comfort. Its numerous comprehensive options enable it to be adapted and incorporated into electrical installations, sophisticated control systems and building management systems. With one variant the Altivar 61 can be used for applications involving medium voltage motors. Observing requirements in respect of electromagnetic compatibility and reducing harmonics were considered right from the design stage. Depending on the various standard versions (UL Type 1/IP 20 and/or UL Type 12/IP 54), class A or class B EMC filters and DC chokes are either integrated, or available as options.

1.2.7 ATS

Figure 1-11 ATS 48 soft starter

The principle of soft starter: Voltage Control: According to the setting accelerating ramp curve to accommodate SCR conduction angle, and therefore realizing low voltage start. The essence of this start method is step-down voltage with limited current. Torque Control

: According to the motor parameters and setting accelerating ramp curve accommodate SCR conduction angle to get the start data model, moreover, it has feedback regulation for SCR conduction angle according to the instantaneous output current in the process of starting. The essence of this method is feedback step-down voltage with limited current.

Three phase motor

M

KC

KC

SCR

SCR

SCR

L

V

W

R

S

T

KC

25

Figure 1-12 Soft starter principle The principle of semiconductor: The SCR is a three-lead device with an anode and a cathode (as with a standard diode) plus a third control lead or gate. As the name implies, it is a rectifier which can be triggered to the “ON” state by applying a small positive voltage ( VTM ) to the gate lead. Once gated ON, the trigger signal may be removed and the SCR will remain conducting as long as current flows through the device. It can also be turned into “OFF” state by applying a negative voltage between anode and cathode. So we can change the conduction angle θ by varying the magnitude of α, and therefore change the output voltage of the motor.

Figure 1-13 Semiconductor principle

Altistart 48 offers you the benefits of its patented Torque Control System (TCS). Ready for immediate start-up, with simplified wiring and extended communication functions, it can be integrated at the heart of your applications in complete simplicity. Torque Characteristics: Curves indicating changes in the torque depending on the starting current of a three phase asynchronous motor. Curves 1: direct line starting. Curves 2: starting in current limiting mode. Torque curve Ts1 indicates the total torque range available depending on the limiting current Is1. Limiting the starting current Is to a preset value Is1 will reduce the starting torque Ts1 to a value which is almost equal to the square of currents Is1/Is. Example: for motor characteristics: Ts = 3 Tn for Is = 6 In, limit the current to Is1 = 3 In (0.5 Is) resulting in a starting torque Ts1 = Ts x (0.5)² = 3 Tn x 0.25 = 0.75 Tn

G1

G2

K1

K2

A1

A2A: AnodeG: GateK: Cathode

ϕ

ϕ

α θ

26

Figure 1-14 Example of torque control by Altistart 48

1.2.8 The products in Installation Systems & Control

Installation Systems & Control Division provides solutions that represent the best in lifestyle and innovation for offices, hotels and homes. Specific examples include award-winning products and technologies covering building and home automation, structured cabling, and designer switches and sockets. The conformity with three famous brands (Clipsal, Merlin Gerin and Merten) brings Schneider Electric a new era of all-direction, high quality and intelligent solution for various customers. The main products of this division include Switches & sockets, intelligent light control and generic cabling system.

27

1.2.8.1 Switches, Sockets & Boxes

S-Turqo

—the first border combined with board switch and socket

Figure 1-15 S-Turqo switch & socket

“S-Turqo”is name for the “Sapphire” in Latin, its design values simplicity and elegance. The color and structure reminds us the exquisite life that everyone dreams of. Actually, it is such a product that counts on this modern notion of life. “S-Turqo” products bring us the concept of “perfect face switch architecture” and redefine the traditional design of switch and socket with a tremendous power. 1、Ease of installation 2、Special design increase efficiency 3、High stability and safety with 16A current for the load E3000 C-Metro ----the first switch & socket with LED indicator lamp

28

Figure 1-16 C-Metro switch & socket

1）It is the first switch & socket with LED indicator, which can illuminate for 10000 hours. Here I would like to talk about the different types of lamp in switch & socket. Generally, it contains three major types: ① Fluorescence：3-4 years the light would fade away. ② Neon：unstable, short service life, high power consumption ③ LED：long service life with low power consumption, stable and effective

2）starts the era of horizontal board instead of traditional vertical one ZENcelo

----the first Full-Flat switch & socket

29

Figure 1-17 ZENcelo switch & socket

1、The revolutionary Full-Flat switch

The Full-Flat form factor has redefined many facets in life. Airplane seats, TVs, Mobile phones. Electric stoves... And now switches. Aesthetically pleasing flat switches are in fact available. But only exclusive to luxurious electronic switches and lighting automation systems. The ZENcelo Full-Flat switch has been created for the majority who use electromechanical switches. Even on switches you never imagined can be Full-Flat...With ZENcelo, luxury is no longer defined by price. But by wisdom and style.

2、Enabled by a new physics

Switch designs are limited by many factors, primarily the switch mechanism. The patented “impress” (iso-motion-press) mechanism ensures the switch dolly remains stationary when it is “on” or “off”, and at the same time occupying a much smaller footprint. Freedom in design has become a reality. Enabled by impress mechanism, ZENcelo makes the future flatter than you ever imagined.

3、Indicate the current status

Form does not sacrifice function. Knowing when the Full-Flat switch is turned on is not taken for granted. The patent-pending “Ondicator” changes to marigold when turned “on”. And blends into the same color as the dolly when “off”. Meticulously designed to the finest detail – Not only for looks, but also for practicality.

4、Embrace for quality

Made of corrosion resistant, heat resistant and impact resistant polycarbonate. Data socket with patented integrated shutter. Electrical socket with reinforced nylon protective shutter. Switches are electric arc encapsulated. Philips head screw to fit both flat and cross head screwdrivers. Switches tested to 80,000 times. Sockets tested to 15,000 cycles. Durable to last more than a decade.

5、Available in White, Silver Bronze, Silver Satin and Silver White colors

30

1.2.8.2 Generic Cabling System

Figure 1-18 Delta 8 core unit

The core unit of the Delta 8 network receives the Voice, Data and Image inputs and then permanently transmits VDI signals to all of the telecommunications outlets in every room:

TV and radio Phone Data applications

These signals are all distributed via a single link using standardized RJ45 connector systems and twisted-pair cable. Delta 8 brings you mobility at home.

1.2.8.3 Wiser Home Control

Smart homes are about technologies. Wiser Homes evolve around people. It adds a new dimension - being Stylish, Living Well and Eco-friendly.

Wiser Home Control interlinks the electrical, multi-media and telecommunication worlds with a single and user-friendly solution – enabling you to monitor, control and access your home beyond physical boundaries at anytime, anywhere, on your mobile phone, computer, door entry system, web tablet… with the same intuitive graphic interface.

31

Wiser Homes go beyond looks and comfort, it is a whole new way of approaching environmental awareness and sustainability. Being eco-friendly is not just about saving, but optimization, living with wisdom and attitude. With Wiser, all you really need to do is to plan innovatively, and it will take care of the rest. It’s simpler than you think !

Wiser Home Control is a scalable solution which is flexible and easy to upgrade. Whether it is an entry-level or a full-blown series of controls, there are different solutions to fit different needs.

1.2.9 Safety Kit and related knowledge

This Arrow-capacitor service is sponsored by France Schneider Electric and it mainly includes three parts:

1. Capacitor investigation

2. Safety Kit installation

3. Capacitor replacement

Here I want to look further about the part two—SK installation. Safety Kit includes three products:

i. Smoke detector/horn 230V 50Hz ii. Three Auxiliary contactor 230V 50/60Hz

iii. Thermal probes package

There three over temperature detection about SK: ① Capacitor over temperature detection

32

Figure 1-19 Detection position for thermal probe

② Reactor over temperature detection ③ Smoke detection

33

Figure 1-20 Safety Kit installation layout

34

1.2.10 Learn how to use SAP software

Headquartered in Walldorf, Germany, SAP is the world's largest business software company – with more than 47,598 employees at sales and development locations in more than 50 countries worldwide. Schneider Electric also uses SAP to manage their everyday affairs. As a member of PES department, I learnt some basic skills to handle the issues in my group, such as give order, edit order, check the spare, search the quotation, etc. Just like the Arrow Capacitor Service, I had to use SAP frequently to statistics the overall number of the service which had put forward by customers and therefore deciding the progress of the project. So It was really rewarding to learn such a powerful office software.

1.2.11 Learn the basic method to read Electric Circuit Diagram

A circuit diagram (also known as an electrical diagram, elementary diagram, or electronic schematic) is a simplified conventional graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components of the circuit as simplified standard symbols; both types show the connections between the devices, including power and signal connections. Arrangement of the components interconnections on the diagram does not correspond to their physical locations in the finished device.

Unlike a block diagram or layout diagram, a circuit diagram shows the actual wire connections being used. The diagram does not show the physical arrangement of components. A drawing meant to depict what the physical arrangement of the wires and the components they connect is called "artwork" or "layout" or the "physical design."

During my intern in Schneider Electric, I learnt some basic knowledge to read Electric Circuit Diagram so as to understand the underlying principles of some project diagrams that our department handled. Especially the SK installation in the Arrow Capacitor Service, I learnt how to read the secondary electrical diagram and totally understood how the SK works.

http://www.sap.com/contactsap/directory/index.epx�http://www.sap.com/contactsap/directory/index.epx�http://en.wikipedia.org/wiki/Electrical_network�http://en.wikipedia.org/wiki/Pictorial�http://en.wikipedia.org/wiki/Schematic�http://en.wikipedia.org/wiki/Electric_power�http://en.wikipedia.org/wiki/Signal_%28information_theory%29�http://en.wikipedia.org/wiki/Block_diagram�http://en.wikipedia.org/wiki/Integrated_circuit_layout�http://en.wikipedia.org/wiki/Electrical_connection�http://en.wikipedia.org/wiki/Integrated_circuit_layout�

35

ChapterⅡ Practice Section

2.1 Arrow-capacitor investigation------FiberHome distribution

substation & Central Southern China Electric Power Institute

FiberHome Technologies is an outstanding product and solution provider for information and telecommunication. FiberHome Technologies traces its heritage to “Wuhan Research Institute of Posts and Telecommunications (WRI)”. Established as early as 1974, WRI is well-known as the cradle of optical communication technology in China. Starting with R&D in the field of optical communications, FiberHome Technologies has evolved into a major Telecom Industrial House, providing total solution in the field of fiber-optic communication, data networking and wireless communication in China over last 30 years. The range of products, Telecom application solutions it can offer and the global customers who have continued their reliance bears testimony of its leadership. The main goal to several substation room in FiberHome is to investigate the condition of capacitor cubicle and decided how many SKs we should installed, how many capacitor we should replace the older ones. First of all, we should check the type of capacitor enclosure (Blokset, OKKEN,…), the type of power factor controller, and the ventilation arrangement. Secondly, we must evaluate the quality of the installation conditions, identify if there are reactors and how they are installed. (It must conform if there is natural or forced ventilation) Thirdly, we also have to check the type of contactor and fuses and interconnections quality. At same time it can help to identify some overheating points. Finally, the most important part is to know the serial number and capacitance in every step on the name plate of the capacitor units. And we should write the information like this:

Moreover, the type of capacitor units should also be considered. There are three types of capacitor in Schneider Electric in recent years. (VARPLUS2 、VARPLUS M “narrow shape” or VARPLUS M “straight shape”).

36

Figure 2-1 overview photo of the FiberHome substation room

Figure 2-2 one of the capacitor units in FiberHome substation room

37

The method the procedure of Arrow capacitor investigation in Central Southern China Electric Power Institute is similar to that in FiberHome as described above. There are six major ones that we should examine: the environmental condition of the capacitor bank, the type of capacitor, installation conditions of the components in the capacitor bank, ventilation system , the setting condition of power factor controller and the maintenance progress. During the checking, we should also record the serial number of capacitor units, contactor, fuse and reactor, if any, in the capacitor bank. I also want to mention the significance of examining the setting parameters in power factor controller, such as delay time, C/K, CT ratio, voltage/wiring, and the compensated steps, etc. After we measured the actual capacitance value in the Central Southern China Electric Power Institute, we found that the contemporary value went beyond the rated value for a large scale, so it may lead to the unexpected dangerous thing in the future if the capacitor still in use. Thus, we gave the suggestion of stopping the running of capacitor bank until we installed SK or replaced the new capacitor next time.

38

Figure 2-3 the capacitor and reactor in Central Southern China Electric Power Institute

substation room I have conducted much more Arrow capacitor investigations besides above two cases. Sometimes it was really hard to investigate since the inappropriate installation method of capacitor cubicle. For this scenario, we may utilize some special tools, such as reflector, brush, flash-lamp and so forth. During the three months, I am much more familiar with this project than any others since I took part in it many times and really learnt a lot.

2.2 SK installation------Yihaikerry(Wuhan) Investment Co., Ltd.

Yihai Kerry is a leading agribusiness and food company with over 20 years of local operating history in China. They process oilseeds, grains, edible oils, palm and laurics into a wide range of high quality food products, feed ingredients and oleochemicals at competitive cost. Their products include edible oils, feed meals, rice, flour, bran, grains, specialty fats, oleochemicals and soy protein

39

concentrate. With over 130 large-scale integrated manufacturing plants located in more than 35 strategic locations, as well as an extensive nationwide sales and distribution network, they distribute their products cost-effectively and with minimum time-to-market.

The major goal of this progress is to install Safety Kit, which is the second step of Arrow capacitor service. The spot environment is relatively well with the temperature of 30 degree centigrade. There are three capacitor cubicles in one of substation rooms in Yihai Kerry, so we installed three SKs in each of the bank. The process of the installation went smoothly, and we also checked the smoke detector by the deliberate smoke.

Figure 2-4 SK installation condition in Yihai Kerry

2.3 Organizing and doing statistics for Arrow-capacitor service

The Arrow-capacitor service includes three steps: 1) Capacitor investigation; 2) Safety Kit installation; 3)Capacitor replacement; moreover, we should conducted the capacitor service for every customer that bought the Schneider Electric’s capacitor during 2004 to 2009, so it is really troublesome to conduct this big project. In this project, I played a role like Project Manager to organize the

40

progress of the whole service and statistics the instantaneous situation. Furthermore, I also have to analyze the number and type of the replaceable capacitor according to the capacitor investigation reports that everyone sent to me. Sometimes it was really painstaking to rush about different spots to investigate and install and then come back home to statistics the reports. But it is this project that hones my communication and management skill.

2.4 Setting and commissioning Varlogic NR6

------Carrefour(Wuhan) Erqi Supermarket

The trouble in Carrefour(Wuhan) Erqi Supermarket is their power factor controller Varlogic NR6 cannot operate. After the careful examination in the spot, we found the reason of this scenario is the error of C/K parameter. So I would like to talk about the C/K setting issue.

CK value can be obtained by the equation c/k=1 / 5 3

Ist

LL

QI A U× ×

Where, IstQ =capacitance volume in the first step(Var)

LLU =Line-Line voltage（V）

1 / 5I A =Current Transformer ratio

The data we measured in the spot showed that IstQ =20KVar, LLU =400v, 1 / 5I A

=4000/5, So we can use the above C/K equation to get the value C/K=0.036. For this scenario, we change the original C/K value to 0.04. Moreover, the DELAY parameter of the capacitor is also too short to put into operating, and we modify it into 60s instead the previous 20s. After we changed these two parameters, the NR6 was in proper operation again. This time I realized a common phenomenon among the majority of customers: They don’t spare time to study the basic approach to use the product until they know the maloperation of the product and call for our service engineers. Sometimes it may take more time and money on repairing it. So it would be more effective to study the basic knowledge by reading our maintenance &repair manual for them.

41

Figure 2-5 the instantaneous cosφ of NR6

The above one is a picture that I took in the Carrefour(Wuhan) Erqi Supermarket

substation room. It represents us the instantaneous cosφ and also the number

of capacitor units that put into the compensating the reactive power.

2.5 Repairing the circuit breaker Evolis ------Wuhan Light rail

The circuit breaker Evolis is best suitable for the medium voltage applications. The issue of this service is the maloperation of Evolis, more specifically, Evolis couldn’t make the appropriate tripping functions. Our manager, some other engineers and me went to the spot and examined the situation. After half an hour, the manager found the crux of this problem is the free screws, so he screwed up the joints and fasten it on the panel. Experience really makes everything seems easy, half an hour can handle this

42

tough problem is absolutely derived from 10 years spot experience.

2.6 Checking the reason of Masterpact MT circuit breaker’s

burnout and complete investigation ------Wuhan Cigarette

Factory

One of the main substation rooms in Wuhan Cigarette Factory had a grave accident about Masterpact MT on 25th, July. Excessive temperature of MT led a shortening of the circuit. Considering some safe issues, they cut off the power for nearly 9 hours so that they lost a vast amount of money. The leaders in Wuhan Cigarette Factory thought much of this accident and required us to give them an official document to explain the reason of this accident. So we invited the engineer specialty from Beijing to give a general overhaul to their low-voltage substation room. In their substation room, there are two MT circuit breakers with the type of 3200A and 1600A specifically, the burned one is 3200A. And when I came there for the first time on 28th,July, I felt the excessive temperature in their substation room( probably about 35 degree centigrade). But this time the temperature is much better (30 degree centigrade). After the careful examination and analysis, we offer a detailed report to explain this accident and made some suggestions for them.

Check Conclusion problems risks solutions

1、over temperature of input line

Over-heat、fire、blow the breaker

Clean and visual inspection Push-in examination and adjust lubrication Contact resistance，opening and closing coils

2、inappropriate protection settings

Low selectivity when the accidents happen, broaden the range of the power off

Well-rounded analysis and arithmetic for the low substation room

3、obsolete M circuit breaker still in use

Equipment is ceased production, it would take a long time once maloperation

Upgrade the M circuit breaker

43

4、only collect 10KV signal from PMS power control system

No power control for 0.4KV system

Refine the power control system by adding the 0.4KV signal circuit

Table 2-1 Check Conclusion of general overhaul of low voltage substation room From the information in the table, we can draw the conclusion that the excessive temperature is the major cause of this grave accident. Though our MT circuit breaker has a rather high temperature limit to stand the overload, the frequent over temperature may break the insulation quality of the breaker. Thus, the broken insulation layer may lead to short circuit.

2.7 Commissioning the Trip units of Masterpact MT ------

The Cancer Center of Union Hospital Wuhan

The main goal for this service is to explain and train them how to accommodate the Micrologic MT. From the previous chapter we have known the basic knowledge of Micrologic MT and next I want to step further about this topic and present how it works.

Figure 2-6 Micrologic trip unit of Masterpact MT Because the Micrologic trip unit P was used in the Cancer Center of Union Hospital Wuhan, I would like to talk about it as an example. Micrologic P control units include all the functions offered by Micrologic A.

44

In addition, they measure voltages and calculate power and energy values. They also offer new protection functions based on currents, voltages, frequency and power reinforce load protection in real time.

Figure 2-7 Micrologic P control units

Protection settings................................................................ The adjustable protection functions are identical to those of Micrologic A (overloads,short-circuits, earth-fault and earth-leakage protection).

45

Fine adjustment Within the range determined by the adjustment dial, fine adjustment of thresholds (to within one ampere) and time delays (to within one second) is possible on the keypad or remotely using the COM option. IDMTL (Inverse Definite Minimum Time lag) setting Coordination with fuse-type or medium-voltage protection systems is optimised by adjusting the slope of the overload-protection curve. This setting also ensures better operation of this protection function with certain loads. Neutral protection On three-pole circuit breakers, neutral protection may be set using the keypad or remotely using the COM option, to one of four positions: neutral unprotected (4P 3d), neutral protection at 0.5 Ir (4P 3d + N/2), neutral protection at Ir (4P 4d) and neutral protection at 1,6 Ir (4P 3d + 1,6N). Neutral protection at 1,6 Ir is used when the neutral conductor is twice the size of the phase conductors (major load imbalance, high level of third order harmonics). On four-pole circuit breakers, neutral protection may be set using a three-position switch or the keypad: neutral unprotected (4P 3d), neutral protection at 0.5 Ir (4P 3d+ N/2), neutral protection at Ir (4P 4d). Neutral protection produces no effect if the long-time curve is set to one of the IDMTL protection settings.

46

Programmable alarms and other protection................................. Depending on the thresholds and time delays set using the keypad or remotely using the COM option, the Micrologic P control unit monitors currents and voltage, power, frequency and the phase sequence. Each threshold overrun is signalled remotely via the COM option. Each threshold overrun may be combined with tripping (protection) or an indication carried out by an optional M2C or M6C programmable contact (alarm), or both (protection and alarm).

Load shedding and reconnection................................................... Load shedding and reconnection parameters may be set according to the power or the current flowing through the circuit breaker. Load shedding is carried out by a supervisor via the COM option or by an M2C or M6C programmable contact.

Measurements................................................................................. The Micrologic P control unit calculates in real time all the electrical values (V, A, W, VAR, VA, Wh, VARh, VAh, Hz), power factors and cosj factors. The Micrologic P control unit also calculates demand current and demand power over an adjustable time period. Each measurement is associated with a minimeter and a maximeter. In the event of tripping on a fault, the interrupted current is stored. The optional external power supply makes it possible to display the value with the circuit breaker open or not supplied.

Histories and maintenance indicators........................................... The last ten trips and alarms are recorded in two separate history files. Maintenance indications (contact wear, operation cycles, etc.) are recorded for local access. Indication option via programmable contacts The M2C (two contacts) and M6C (six contacts) auxiliary contacts may be used to signal threshold overruns or status changes. They can be programmed using the keypad on the Micrologic P control unit or remotely using the COM option. Communication option (COM) The communication option may be used to: remotely read and set parameters for the protection functions transmit all the calculated indicators and measurements signal the causes of tripping and alarms consult the history files and the maintenance-indicator register. maximeter reset. An event log and a maintenance register, stored in control-unit memory but not available locally, may be accessed in addition via the COM option.

47

2.8 Checking the reason of non-indication of Trip units of

Masterpact MT circuit breaker ------Hubei XiSai Mountain power

plant

Hubei XiSai Mountain power plant is a Chinese and Foreign joint venture. It plays a very important role in distribution and generation electricity in Hubei Province. And this service is to check the reason of non-indication of Trip units of Masterpact MT circuit breaker. According to what I knew from manual, the reasons of the non-indication of Trip unit are 1）the control unit has no battery; 2）it needs external 24V DC power supply. And the 24V DC power supply is one of the accessories of Micrologic control units; see the figure 2-8. External 24 V DC power-supply module The external power-supply module makes it possible to use the display even if the circuit breaker is open or not supplied (for the exact conditions of use, see the “electrical diagrams” part of this catalogue). This module powers both the control unit (100 mA) and the M2C and M6C programmable contacts (100 mA). If the COM communication option is used, the communication bus requires its own 24 V DC power supply, independent with respect to that of the Micrologic control unit. With the Micrologic A control unit, this module makes it possible to display currents of less than 20 % of In. With the Micrologic P and H, it can be used to display fault currents after tripping.

Figure 2-8 External 24V DC power supply module

The substation room in Hubei XiSai Mountain power plant used the Micrologic 5.0A control units, and the temperature there is very comfortable. We examined all the functions of Micrologic units by Full Function Test Kit. The result of five control units showed us that the long time(RMS) protection Ir is normal( the mean trip time is 14s), but the short time(RMS) protection Isd, tsd is abnormal(only 0.046s).

48

Figure 2-9 Full Function Test Kit

The result showed us that the circuit breaker can be blow properly but with the limited selectivity since the beforehand of short time protection. Here I have to explain the principle of Zone Selective Interlocking Short-time and ground-fault protection can be interlocked to provide zone selective interlocking. Control wiring links several trip units in the distribution network and in the event of a fault, a trip unit will obey the set delay time only if receiving a signal from a downstream trip unit. If the trip unit does not receive a signal, tripping will be instantaneous (with no intentional delay). • The fault is cleared instantaneously by the nearest upstream circuit breaker. • Thermal stresses (I2t) in the network are minimized without any effect on the correct time delay coordination of the installation. Figure 2-10 shows circuit breakers 1 and 2 zone selective interlocked. • A fault at A is seen by circuit breakers 1 and 2. Circuit breaker 2 trips instantaneously and also informs circuit breaker 1 to obey set delay times. Thus,

49

circuit breaker 2 trips and clears the fault. Circuit breaker 1 does not trip. • A fault at B is seen by circuit breaker 1. Circuit breaker 1 trips instantaneously since it did not receive a signal from the downstream circuit breaker 2. Circuit breaker 1 trips and clears the fault. Circuit breaker 2 does not trip.

Figure 2-10 Zone-selective Interlocking

2.9 Removing leakage protection of Masterpact MT circuit

breaker ------ Hutchinson (Wuhan) rubber Investment Co., Ltd.

Hutchinson manufactures and markets products derived from rubber processing for the automotive and aerospace industries. Hutchinson serves the Chinese market through two subsidiaries specialized in each of its two business areas. Hutchinson (Wuhan) Automotive Rubber Products Co., Ltd. was established in August 1995. It was initially a joint-venture enterprise of Hutchinson and Dong Feng Exploring Development company, and became a wholly-owned subsidiary of Hutchinson in April 2007. Producing the fluid transfer systems and body sealing system, the plant has introduced world-class facilities for automotive rubber production using equipment and expertise from France. Hutchinson (Wuhan) Automotive Rubber Products Co., Ltd. used Micrologic 7.0 trip control unit. Micrologic 7.0 offers selective, earth and leakage protection for the circuit. But the leakage protection often maloperated there, so they required us to remove the leakage protection in case of malfunction. It has close relationship with the secondary electrical diagram see as Figure 2-11.

50

Figure 2-11 leakage protection electrical diagram of Micrologic 7.0

From the figure 2-11, we can arrive at the conclusion that the leakage protection of Micrologic 7.0 can be removed by shortening the three lines M1,M2 and M3. Thus, the rectangular transformer would not collect any voltage signal from the three phases. Connecting T4 and M3 can ensure this removal further.

2.10 Utilizing AutoCAD to draw the diagram of Converter

Transform project

AutoCAD can draw many electrical diagrams for the industry and companies. Based on some parameters and drafts of the Converter Transform project in Henan Province, I finished the drawing part independently with the highly praise of my manager. From the initial self-learning AutoCAD to draw the whole project diagram independently, it was really a great leap for me.

51

52

Chapter Ⅲ Conference Section

3.1 Regular meeting and group discussion

Sometimes my department will have a regular meeting at two or three weeks intervals. The main propose of the meeting is to share our recent project progress and experience. From the initial call contract with customers to going to the spot, all the engineers will talk about what they have learned from this specific project or service. And then our manager would provide some suggestions and requirements about their following a couple of weeks. I think this kind of meeting is of great significance to the development and communication of my department. Because all the engineers are so busy to rush between different spots to do service that they seldom have abundant time to sit together to talk with others. It is really a great chance for us to know the progress of each service and project. Moreover, we often have some group discussion with each other. Once an service engineer discussed the harmonics problem that happened in the electric locomotive with me for nearly an hour. By analyzing some figures from he collected in the spot, we arrived at the resonant conclusion about the stability of the system, harmonic component, cause of the harmonics, etc.

3.2 Arrow-capacitor service telephone conference

This conference is about the Arrow-capacitor service in our service department from Beijing and Wuhan, and it is also the first telephone conference that I have ever taken. The call is from the manager in Beijing who is in charge of the Arrow-capacitor service. First he explained to us the progress of this project and set more tasks to us. The overall sequence of this project is : Capacitor investigation---Safety Kit Installation---Capacitor replacement There are three types of customers: 1、 Key Account 2、 Plant’s customers(SAP list) 3、 End users

53

3.3 Central 、 South and Southwestern China Business

Development conference

The managers and Business Development Engineers from Central (Chengdu Province, Wuhan Province) and southern China got together and had a two conference in Wuhan. The contents of this conference are about the recent project of Business Development and share their experience. Moreover, the senior ones also give some basic introduction to the fresh Business Development Engineer. At the end of this conference, I discussed about the service report with the Key manager in Central China and he valued my suggestions very much. In my perspective, the most direct and obvious presentations to the customers are our service reports (Maintenance report, Transform Report, repairing report, etc.) It is the report that tells the customers if we are serious about their project and our professionalism. In this sense, the report is pretty important than any other part. So we have to take more time on enhancing our capability on writing a decent report. Maybe we can keen on the four major aspects: choice of words, picture, typesetting and material. Only in this way can we make the customers deeply understand our devotion and efforts. My opinions really arouse echo in everybody present.

3.4 The spare parts contract between Dongfeng PEUGEOT

CITROEN Automobile Company Ltd and Schneider Electric

Dongfeng PEUGEOT CITROEN Automobile Company Ltd was established in 18th May, 1992, and its headquarter lies in Wuhan, Hubei Province. It has three large factories and over 10 business department in advanced cities such as Beijing, Shanghai, etc. Their products include two famous brands: PEUGEOT and CITROEN. Dongfeng PEUGEOT CITROEN Automobile Company Ltd has established a wide-range exchange and long cooperative relationship with Schneider Electric (China) Investment Co.,Ltd. They purchased many essential equipments from Schneider Electric, such as transformer, circuit breaker, disconnector, converter, etc. As the ever developing business demand, Dongfeng PEUGEOT CITROEN Automobile Company Ltd decided to sign an open-end contract with Schneider Electric so that they can purchase our products more quickly. Because it would improve their efficiency and convenience. Here I want to explain the definitions about the open-end contract: It is an

54

agreement to supply goods or services in which quantity to be supplied at the contracted price is not specified, and the buyer may purchase any amount during the life of the agreement. The contract would shorten supply period and both of Dongfeng and Schneider can improve the efficiency. Managers from Eastern, Central and southwest China in Schneider Electric and me had a preliminary agree-on conference with the Purchasing Department from Dongfeng PEUGEOT CITROEN Automobile Company Ltd. I think our cooperation would be very pleasant, and I also hope that we can have a greater and a more extensive cooperation to achieve a win-win situation.

http://www.businessdictionary.com/definition/agreement.html�http://www.businessdictionary.com/definition/supply.html�http://www.businessdictionary.com/definition/goods.html�http://www.businessdictionary.com/definition/services.html�http://www.businessdictionary.com/definition/quantity.html�http://www.businessdictionary.com/definition/price.html�http://www.businessdictionary.com/definition/buyer.html�http://www.businessdictionary.com/definition/purchase.html�http://www.investorwords.com/205/amount.html�

55

Chapter Ⅳ Intern Reflections

Throughout these three years in university, I have filled a variety of roles: undergraduate, research assistant, project leader, league branch secretary, etc. Three months ago, I began my new role as an intern in Schneider Electric (China) Investment Co.,Ltd.Wuhan Branch. From the first day interning at Schneider Electric, I knew it was going to be a good fit. What made my internship so successful was a combination of three factors. I was constantly learning something new. Everyday I understood new knowledge about the functions and principles of various products, about employing method of various products, about trouble-shooting and commissioning approach for specific product. Set the circuit breaker product—Masterpact MT as an example, I could always learn something new about it. When I scanned its catalogue for the first time, I just remembered its fundamental definition “A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.” When I was imparting basic principles by my manager, I learned its major elements and inherent constructions. When I did the first cite service at the cancer center of Union Hospital, I got to know the employing method of Trip units of Masterpact MT. When I did a second cite service at Hubei XiSai Mountain power plant, I learned the main reasons of non-indication of Trip units of Masterpact MT. When I did another cite service at Hutchison rubbery factory, I learned the way to remove the leakage protection of Trip units of Masterpact MT. Though I am so sure that there exists much knowledge to be explored for Masterpact MT, I am also sure that the abundant knowledge is accumulated everyday. I was so glad that I could have this kind of valuable chance to study these products and assisted experienced engineers when we were doing cite services. I was given challenging and varied services and projects. I never thought of myself could be an office person who sit at the desk to handle different tasks. Luckily, my job offered me different assignments. Sometimes I went outside to do site services with experienced engineers and assisted them in trouble-shooting process. Sometimes I stayed in office to handle some papers and reports about my cite services. Sometimes I attended conference to share experience with other engineers in my department. Over these three months, I have assisted experienced engineers for over 20 different services on spot. Every service really taught me a lot of experience. Arrow-capacitor service, which is one of the most frequent services that I have involved, taught me some valuable knowledge

56

about reactive power compensation. When I first did the capacitor cubicle investigation, i found the definitions of “environmental temperature” and “temperature rise” were so hard to clarify for end users. Facing with their doubts for my capabilities, I felt so embarrassed. After careful thinking and consulting, I got to know that their accurate explanations. “Environmental temperature” is the temperature in substation room while “temperature rise” is the temperature difference between substation room and capacitor cubicle. These temperature definitions are quite important for the standards of the optimum environment for the operation of capacitor. This kind of challenging task forced me to find out the correct answer to solve problems. I was accepted as part of the team. From the first day, the staffs made me feel like I was one of them. I took part in staff general meetings and conference meetings, had experienced engineers to take me to do service on spot, had my own projects, had my own desks, and amazingly—even my own computer which was sent by another branch. Working full-time definitely contributed to this feeling, but more importantly, the staff was warm and welcoming. The first day of my interning, I received a lot of business cards; the names on them were quite unfamiliar. But after these three months, I feel so warm and unforgettable when I read the names especially matches to the specific person. Sweet regards, serious concerns, sincere comforts, all of which drived me into this big company.

The success of my internship had provided me with knowledge and confidence that will help me a great deal in my future life. Now I have a deep understanding of what factors would contribute to a satisfying work and how to choose my academic career to strengthen my foundation. In addition, I have developed confidence in myself as a valuable employee and as an easygoing colleague. I cherish this valuable opportunity to experience another wonderful life, and will take this experience with me as I move on to fill the next stage of my life.

ChapterⅠLearn SectionLearn the background of Schneider Electric1.1.1 Schneider Electric’s Profile1.1.2 Schneider Electric in China1.1.3 Schneider Electric’s Major projects in China1.1.4 The specific divisions in China and PES department

1.2 Learn some main products and related knowledge1.2.1 Masterpact NT/NWBrief introductionMain features of Masterpact NT and NW:Micrologic control units in Masterpact NT and NW:

1.2.2 Compact NSX1.2.3 EV12s1.2.4 Varlogic NR6/12,NRC121.2.5 AccuSine1.2.6 ATV1.2.7 ATS1.2.8 The products in Installation Systems & Control1.2.8.1 Switches, Sockets & Boxes1.2.8.2 Generic Cabling System1.2.8.3 Wiser Home Control

1.2.9 Safety Kit and related knowledge1.2.10 Learn how to use SAP software1.2.11 Learn the basic method to read Electric Circuit Diagram

ChapterⅡ Practice Section2.1 Arrow-capacitor investigation------FiberHome distribution substation & Central Southern China Electric Power Institute2.2 SK installation------Yihaikerry(Wuhan) Investment Co., Ltd.2.3 Organizing and doing statistics for Arrow-capacitor service2.4 Setting and commissioning Varlogic NR6 ------Carrefour(Wuhan) Erqi Supermarket2.5 Repairing the circuit breaker Evolis ------Wuhan Light rail2.6 Checking the reason of Masterpact MT circuit breaker’s burnout and complete investigation ------Wuhan Cigarette Factory2.7 Commissioning the Trip units of Masterpact MT ------ The Cancer Center of Union Hospital Wuhan2.8 Checking the reason of non-indication of Trip units of Masterpact MT circuit breaker ------Hubei XiSai Mountain power plant2.9 Removing leakage protection of Masterpact MT circuit breaker ------ Hutchinson (Wuhan) rubber Investment Co., Ltd.2.10 Utilizing AutoCAD to draw the diagram of Converter Transform project

Chapter Ⅲ Conference Section3.1 Regular meeting and group discussion3.2 Arrow-capacitor service telephone conference3.3 Central、South and Southwestern China Business Development conference3.4 The spare parts contract between Dongfeng PEUGEOT CITROEN Automobile Company Ltd and Schneider Electric

Chapter Ⅳ Intern Reflections