EC_QM_3571_Nang Giang Co. Ltd-1

8/3/2019 EC_QM_3571_Nang Giang Co. Ltd-1

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Ref: EC_QM_3571_FSK April 14, 2011

Nang Giang Co. Ltd.

VietnamSub.: Our Offer for 100 MVAR SVC Project

This is with reference to the above, kindly find attached herewith our offer as per the followingannexure:

Annexure 1 : Scope of WorkAnnexure 2 : Prices, Commercial Terms & ConditionsAnnexure 3 : Technical Specification

We hope you will find our offer in line with your requirement and look forward to the pleasure of

receiving your most valued order.

In case of any query please feel free to contact us any time.

Thanking you,

Yours faithfully,For Energe Capacitors Pvt. Ltd.,

Felix KadamDy. General Manager Marketing


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ENERGE CAPACITORS PVT. LTD.

Ref: EC_QM_3571_FSK April 14, 2011Nang Giang Co. Ltd.-------------------------------------------------------------------------------------------------------------------------------

Page 2 of 26

ANNEXURE 1

AUSTRALIAN STEEL BILLET COMPANY90/100 MVAR SVC PROJECT QUOTATION

1. SCOPEAs given in this quotation, the scope of this project includes; preparing required projects,

manufacturing and supplying equipments, supervising during erection, commissioning andfinally showing system performance by appropriate tests and measurements.

Hereafter, AUSTRALIAN STEEL BILLET COMPANY and ECPL will be mentioned as BUYER

and SELLER in this document, respectively.

2. SCOPE OF SUPPLY AND DIVISION LIST

Responsibility of all parties in the project and scope of supply are described in the division list.

List of abbreviations in the division list are given below:

BD : Basic Data

BE : Basic Engineering

DE : Detailed Engineering

SU : Supply

ERT : Erection

COM : Commissioning

SUPS : Supervisory Service

S : Seller

B : BuyerThere are three types of engineering that must be performed during the project schedule.

2.1. Basic Data (BD)

Basic data denotes the basic information for the buyers engineering.

2.2. Basic Engineering (BE)

SELLER will present functional descriptions and technical specifications of all equipments in the

SVC system as an output of basic engineering. The customer has to approve the basic engineeringdata in the specified time. Approved documents of basic engineering become a part of the

contract and form the basis for the detailed engineering of the system.

Basic engineering will be done by the respective party specified in the division list.

2.3. Detailed Engineering (DE)

This covers the design of all hardware/software parts of SVC system specified in the approvedbasic engineering documents.

Detailed engineering will be done by the respective party specified in the division list.


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ANNEXURE 1

Description Engineering Other PartsBD BE DE SU ERT COM SUPS

MV Feeders for SVC

Voltage Transformers S S S B B S SCurrent Transformers S S S B B S SSVC Feeder Circuit Breaker B B B B B S STCR& HF Circuit Breakers S S S B B S SSteel Structures S S S B B S SBuswork / Erection Material S S S B B S S

SVC MV Parts

Surge Arrestor for SVC S S S S B S SInsulators for HF S S S S B S SAluminium Busbars S S S S B S SAluminium Conductors S S S S B S S

SVC TCR Equipment

Thyristor Valve S S S S B S SThyristor Controlled Reactors S S S S B S S

Wall bushings between reactorand thyristor stack S S S S B S SBuswork / Erection Material S S S S B S S

SVC Harmonic Filters

Filter Reactors S S S S B S SFilter Capacitors S S S S B S SResistors ( 2nd and 4th HF filters) S S S S B S S

Current Transformers S S S S B S SInterconnections capacitors &reactors S S S S B S S


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ANNEXURE 1


Water Cooling SystemCooling System S S S S B S SCooling System Piping betweenCooling system and ThyristorValve S S S S B S SIndustrial Water Piping S S S B B S S

Industrial Water, De-ionizedWater and Glycol S S S B S S S

Cubicles for SVC

SVC Control System S S S S B S SValve Base Electronic S S S S B S S

SVC Protection System S S S S B S SSignalling S S S S B S SAuxiliary Power Distribution S S S S B S S

HMI for SVC

Industrial PC S S S S B S SSoftware for Ethernet andSCADA S S S S B S SCables between SVC and EAFRoom S S S B B S S

Cables and Earthing Materials

Medium Voltage Cables S S S B B S S

LV Power, Control and CT/PTcables S S S B B S SFiber optic cables S S S S S S SSVC Equipment Earthing S S S B B S SCable trays and accessories S S S B B S S


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ANNEXURE 1

In addition to the division list given above, following items are also under BUYERs responsibility:

Protection relays specified in Table-3

Transportation of goods on the field

Lighting and Lightening

Fire Alarm System


Other Services

SVC Layout S S S S - - -Civil Design S S S S - - -Civil Work - - - B B S SVentilation and Air Conditioning S S S B B - -Foundation and Security Fences S S S B B - -

Erection

Tools - - - B - - -Special Tools - - - S - - -Auxiliary Supply - - - B B - -Office - - - B B - -

Storage Room - - - B B - -Accommodation - - - B - - -Commissioning

Tools - - - B - - -Special Tools - - - S - - -Labour - - - B - - -Auxiliary Supply - - - B - - -Storage Room - - - B - - -Accommodation - - - B - - -

Tests

Open Package Inspection - - - - - S -

System Tests S S S - - S -Training

On-Site Training - - - S - - -


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ANNEXURE 1

3. SPECIAL NOTES ON RESPONSIBILITIES

3.1. Erection Supervision

For erection supervision, SELLER envisages the presence of 1 SELLER specialist at plant site upon

the request of BUYER. The supervision for erection is supposed to be 30 days at most.

SELLER specialist should be available at site during the unloading of thyristor stacks.

BUYER has to pay 320 US $/day (for each day beyond 30 days erection supervision) for each

SELLER specialist if erection cannot be finished in 30 days because of the reasons caused by

BUYER.

3.2. Commissioning Supervision

For commissioning supervision, SELLER envisages the presence of 3 SELLER specialists at plantsite upon the request of BUYER. The supervision for commissioning is supposed to be 30 days at

most. BUYER has to pay 200 Euro/day (for each day beyond 30 days commissioning supervision)

for each SELLER specialist if commissioning cannot be finished in 30 days because of the reasons

caused by BUYER.

3.3. Training

Training to the responsible personnel of BUYER will be given at site after commissioning by

commissioning engineer of SELLER.

3.4. Flights and Accommodation

Following costs of the supervisors will be paid by BUYER.

International and domestic flight tickets

Accommodation including hotel and food

Transportations between hotel and site


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Page 7 of 26

ANNEXURE 2

PRICESSl. No. Description Qty. Unit Price in

US $Total Price inUS $

1 Equipments of 90 MVAr SVC system 1 set 3,663,000/- 3,663,000/-

2 Supervisory service of Erection 1 set 46,500/- 46,500/-3 Commissioning 1 set 93,000/- 93,000/-

TOTAL 3,802,500/-1 Spare Parts (option) 1 set 93,000/- 93,000/-

COMMERCIAL DETAILS

1st payment

30% of the total contract price as advance payment.

2nd payment

70% of the total price shall be paid, pro-rata, through an irrevocable and confirmable Letter of

Credit, against shipping documents, but not later then 1 months from the notice of good ready for

shipment, in case shipment is delayed for reasons not imputable to SELLER. Partial shipment

shall be allowed and partial payments shall be effected for the individual partial shipments.

Warranty Bonds

We undertake warranty for the equipments for a period of 12 months after the commissioning.

DELIVERY PLACE

Ex Works

TIME SCHEDULE AND PENALTY FOR DELAYS

Time Schedule

Detailed time schedule of the project will be given after signing of contract. However, the

milestones of the project are as follows:

Notification for the delivery of goods : 7-8 months after the down payment

Erection (BUYERs responsibility) : 30 days after the receipt of goods for installation in the field

Commissioning (SELLERs responsibility) : 30 days after the completion of erection

Complying With Scheduled Dates

SELLER will deliver its services according to the schedule provided that delays are not related to:

later changes or additions to the contractual scope of supply delays by BUYER in fulfillment of its obligations

delays by SELLER in fulfillment of its obligations

delays by third parties in fulfillment of SELLER responsibilities according to the individual

contract between SELLER and third parties

other conditions for which SELLER could not be held responsible


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ANNEXURE 2

7.3. Extension of Scheduled Dates

If delays occur in scheduled dates according to part 14.2., SELLER has the right to extend

appropriately the originally agreed scheduled rates. Contract parties should agree on revised

dates.

8. LIST OF SUPPLIERS

No. Component Manufacturer Quantity

1 Harmonic Filter Bank Energi 3 sets2 TCR Reactors Trench/Coil Innovation /

Shrihans Electricals6 pcs.

3 Harmonic Filter Reactors Trench/Coil Innovation /Shrihans Electricals / Energi

9 pcs.

4 Damping Resistors MS Resistances / Schneiwindt 3 pcs.

5 Thyristor Stack Westcode / DynexSemiconductors

1 set

6 Water Cooling System Swedewater 1 pcs7 SVC Control and Protection System Endoks 1 set8 Current Transformer Gyro / Alce 1 set9 Surge Arrestor Oblum / ABB 1 set10 Protection Relays ABB 1 set11 72.5 KV Circuit Breaker ABB / Areva / CGL 2 pcs.

9. WITNESSING TESTS

SELLER personnel will witness the factory acceptance tests of harmonic filter banks, air core

reactors, thyristor stacks. BUYER can also witness these tests if required.BUYER can witness the following tests that will be carried out at SELLER site:

Thyristor Stack-Water Cooling System Integration Tests

Thyristor Stack-Control System Integration Tests

Thyristor Stack-Protection System Integration Tests

10. REGULATIONS and STANDARDS

BUYER, at latest when giving the order, has to inform SELLER about all regulations andstandards applicable to provision of services, operation of plant, healthy and safety. BUYER shall

make SELLER aware of any special consideration to be shown to the BUYER itself or third parties

during the provision of services.


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ANNEXURE 2

11. RESPONSIBILITIES OF PARTIES

SELLER is responsible from all permits, licenses, taxes, fees and any other charges inside of

INDIA.

BUYER is responsible from all permits, licenses, taxes, fees and any other charges outside ofINDIA.

12. IMPOSSIBILITY OF PERFORMANCE DUE TO FORCE MEASURE

SELLER is not responsible from damages resulting from delays or limitations of supply which are

not under its control by reasonable interpretation. Examples are serious work interruptions,

accidents, labor conflicts, intervention or default of authorities, natural catastrophes or delays in

supplies or services by third parties due to same causes.

13. TERMINATION

In all cases where contractual performance is not duly affected and where not expressly covered,

BUYER shall grant SELLER a reasonable additional period to correct its performance. If such

additional period lapses and is unused due to fault on the part of SELLER, BUYER may terminate

the contract with respect to the services which are not in conformity with the contract.

If BUYER has in payment arrears and do not respond to the first warning of SELLER, SELLER has

the right of withdraw either totally or partially from the individual contract. In this case, all rights

of the SELLER remain unchanged.

Contract parties undertake to continue their contractually agreed services in total until the

effective time of contract termination. In case of contract termination resulting from insolvency of

BUYER, this responsibility is only applicable if BUYER assures payment for the outstanding

services in advance. If premature contract termination happens, SELLER is entitled to

compensation for work supplied up to the time of termination. If BUYER unilaterally withdraw

from an individual contract, then SELLER is entitled to compensation for any damages (or loss of

earnings) resulting from this premature withdrawal.

14. WARRANTY

a) The period of warranty for SVC system is twelve months after the commissioning of the SVC

system. If acceptance of SVC system is delayed for reasons for which SELLER is not responsible,

the warranty period shall end at the latest 18 months after the completion of SVC system.


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Page 10 of 26

ANNEXURE 2

b) If it is discovered before the end of the warranty period that the services have not been

provided in professionally, SELLER shall correct the services concerned within a reasonable

period upon written request of BUYER, provided that BUYER has immediately notified SELLER

in writing of the defects during the warranty period. SELLER shall withstand any costs incorrecting the defects.

c) Warranty for services provided by the personnel of BUYER shall only be given by SELLER if

the defects can be proved to be caused by the gross negligence of SELLER personnel in issuing

instructions or carrying out supervision.

15. ACCEPTANCE OF SERVICES

a) Services shall be ready for acceptance when SVC system is ready to be put into operation asagreed.

b) As soon as SELLER has notified BUYER that the services are ready for acceptance, they shall be

inspected by BUYER in the presence of a representative of SELLER. Any defects are to be reported

immediately in writing to SELLER.

c) If SELLER is responsible for defects discovered during acceptance, it shall correct such defects

as soon as possible. BUYER shall give SELLER sufficient opportunity and time to do so.

16. APPLICABLE LAW and JURISDICTION

The contract shall be governed by Indian Law. The contract parties agree on India as the place of

jurisdiction.

17. VALIDITY OF OFFER

Prices, conditions and specifications of this offer are valid until 31/07/2011


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Page 11 of 26

ANNEXURE 3TECHNICAL SPECIFICATIONS

1. STANDARDSDesign procedures of the reactive power compensation and harmonic filtering systems will be

doneaccording to the following standards and recommendations:

- IEC 61000-3-6, Limits Assessment of emission limits for the connection of distorting

installations to MV, HV and EHV power systems

- IEC 61000-3-7, Electromagnetic compatibility (EMC) - Part 3-7: Limits - Assessment ofemission limits for the connection of fluctuating installations to MV, HV and EHV powersystems

- IEEE Std. 1531-2003, IEEE Guide for Application and Specification of Harmonic Filters

- IEEE Std. C37.99-2000, IEEE Guide for the Protection of Shunt Capacitor Banks- IEEE Std. 141-1993, IEEE Recommended Practice for Electric Power Distribution for

Industrial Plants

- IEC 60076-6, Reactors

- IEC 61954, Power electronics for electrical transmission and distribution systems - Testing

of thyristor valves for static VAR compensators

- IEC 61131, Programmable Controllers

2. EQUIPMENT SPECIFICATIONS

During the design stage of the reactive power compensation and harmonic filtering project; hard

environmental conditions will be taken into consideration. Unless it is specified, all the equipment

will satisfy all the international (IEC) standards.

3. SYSTEM DATA

3.1. Point of Common Coupling

Supply Frequency : 50 Hz

Nominal Bus Voltage : 110 kVHighest System Voltage : 123 kV

Frequency : 50 Hz

Minimum Short Circuit Power : 6000 MVA (as specified by BUYER)


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ANNEXURE 3

3.2. Step-Down Transformer

Transformer Rating : 90 MVA

Transformer Ratio : 110 kV / 22 kV

Short Circuit Voltage : 12.5 % (@ 90 MVA)Vector Group : YNyn0d11

3.3. Medium Voltage (MV) System

Nominal Bus Voltage : 22 kV

Maximum Bus Voltage : 24.2 kV (1.1 p.u.)

Minimum Bus Voltage : 19.8 kV (0.9 p.u.)

3.4. Environmental Data

Ambient Temperature : +5 / +44 C

Humidity : 85 %

Altitude :


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Page 13 of 26

ANNEXURE 3

4.2. SVC System Design

4.2.1. General Technical Information

SVC system includes a Thyristor Controlled Reactor (TCR, variable inductive reactive power) and

harmonic filter banks (HF, constant capacitive reactive power). Size of the SVC system is decidedaccording to the reactive power compensation of the EAF&LF and flicker requirements.

Thyristor Controlled Reactor will reduce the disturbing effects of the electric arc furnace (EAF)and ladle furnaces (LF) such as flicker and voltage fluctuation.

Voltage stabilization can be achieved directly in voltage mode operation mode and indirectly in

reactive power compensation mode. The following equation is satisfied in reactive power

compensation mode.

Qload+QTCR-QHF = 0

Qload : Total reactive power of EAF/LF

QTCR : Reactive power of thyristor controlled reactor

QHF : Reactive power of harmonic filter banks

SVC System compensates reactive power of the load (Arc Furnace, Ladle furnace, Rolling Mill

etc.), increases voltage stability at the medium bus and reduces voltage fluctuations at PCC. A

properly designed SVC system can reduce flicker and voltage distortion at PCC. It can also

balance the unbalance load currents.

An SVC consists of mainly two parts called Thyristor Controlled Reactor and Harmonic Filters.Thyristor controlled reactor consists thyristor valve directly connected to 22 kV bus in series with

the air core reactors. Harmonic filter banks will reduce the disturbing effects of the electric arc

furnace (EAF) and ladle furnaces (LF) such as harmonic problems and poor power factor.

4.2.1.1. Thyristor Controlled Reactor

TCR provides inductive reactive power whose magnitude can be controlled by varying the firing

angles of the thyristors. They are delta connected and splitted into two series connected coilsbetween two phases. The complete TCR system consists of 6 reactors. The medium voltage

thyristor valves (back-to-back connected strings ) are between the two coils in each phase.TCR are air core, air cooled epoxy impregnated reactors which are connected one above the other

to form a stack.

An SVC can make load balancing according to Steinmetz Law if and only if the total inductive

Reactive power of the TCR is higher than the capacitive reactive power of the capacitor banks.

This makes the temporarily overload of the TC reactors necessary. The short time overloading of the

TCR is 125 %.


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ANNEXURE 3

4.2.1.2. Harmonic Filter Banks

Harmonic filter banks provides the capacitive reactive power to compensate the inductive reactive

power consumed by the load. They also absorbs the current harmonics generated by the load and

TCR. They are designed for outdoor installation. They consists of capacitor bank and seriesconnected air core reactor which are reliable and maintanence free. The capacitor banks are

double Y (Y-Y) connected. Unbalance protection is realized by the unbalance current transformer

between the star points.

The capacitor units used in capacitor banks are manufactured and tested according to IEC 60871

Standard.

They are all film-NON PCB, internally fused units.

The filter reactors are air core, air cooled epoxy impregnated reactors.

4.2.1.3. Thyristor Stack

Thyristor stacks are composed of back-to-back thyristor pairs, which are connected in series. The

number of back-to-back connected thyristor pairs is decided according to the medium voltage

level. (n+1) redundancy is also included in the thyristor stack designs.

Each thyristor pair shall also have dynamic and static equalizing snubber networks. Thyristors

will be fired by using isolated firing circuits, which shall be optically isolated. Each Thyristor pair

shall also have an over voltage protection based on Break-over diodes (BOD).

Firing units shall have their own power supply units, which are being supplied from anode-

cathode of thyristor pairs directly (especially for thyristor stacks directly connected to 22 kV bus).

A typical connection of a thyristor stack is shown in Figure-1.

Figure 1: Medium Voltage Thyristor Stacks (Principle Diagram)


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ANNEXURE 3

4.2.2. Proposed SVC Configuration

4.2.2.1. Calculation of SVC Rated Power

SVC rating is found by considering the mean reactive power of the EAF&LF and dynamic reactive

power which is coming from the variations in the load.P EAF = SEAF x cos(phi) = 60 x 0.75 = 45 MW

Q EAF = SEAF x sin(phi) = 60 x 0.66 = 39.6 MVAr

P LF = SLF x cos(phi) = 20 x 0.75 = 15 MW

Q LF = SLF x sin(phi) = 20 x 0.66 = 13.2 MVAr

______________________QDYN = (QEAF X 0.7)2 + (QLF X 0.2)2 = 27.85 MVAR

QSVC > QEAF+QLF+QTR+QDYN = 85.65 MVAr

Hence, 90 MVAr SVC rating is quite sufficient to keep the power factor at unity at PCC.

4.2.2.2. Flicker Calculations

Flicker severity level Pst is specified as 1 at 110 kV bus.

Pst : Short term severity

Short term severity (Pst) is a measure of the visual severity of flicker found from the time seriesoutput of a flicker meter over a 10-minute period.

Pst (99 %) = Kst x QFUR,SC/ PCC Short Circuit Power

Kst denotes the arc furnace severity factor. Kst value changes between 45 to 85 depending on how

unstable the furnace operation is. Kst is chosen as 75 in the calculations below. Correlation

between Pst (99 %) and Pst (95 %) is 1.25.

Pst (95%) = 0.8 x Pst (99 %)

QFUR,SC denotes the short circuit reactive power of the furnace at PCC. It is found by calculating

The total reactance at PCC. Total reactance at PCC is composed of supply reactance, step down

transformer reactance, furnace transformer reactance, series reactor reactance, and furnace

secondary reactance.

Calculated flicker values are given in Table-1(for 6000 MVASC) and Table-2 (for Pst 1.0).

As can be seen from Table-1 and Table-2, flicker severity level Pst is reached by 90 MVAr SVC

System for the following conditions:

i) MVASC at PCC 2700 MVA

ii) Background flicker 0.5 for 6000 MVASC


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ANNEXURE 3

Table 1 : Flicker Calculations (MVAsc = 600 MVA)

Case 1 Case 2 Case 3 Case 4 Case 5 Case 6GRID

Short Circuit Power at PCC MVA 6.000 6.000 6.000 6.000 6.000 6.000

STEP DOWN TRANSFORMER:

Primary Voltage KV 110 110 110 110 110 110

Secondary Voltage KV 22 22 22 22 22 22

Rated Power MVA MVA 90 90 90 90 90 90

Short Circuit Impedance % 12.5 12.5 12.5 12.5 12.5 12.5

FURNACE TRANSFORMER:

Primary Voltage KV 22 34.5 34.5 34.5 34.5 34.5

Secondary Voltage KV 0.85 0.85 0.85 0.85 0.85 0.85



FURNACE

Secondary Impedance m 2.6 2.6 2.6 2.6 2.6 2.6

Series Reactor Impedance 2.00 1.60 1.20 0.80 0.40 0.00

Series Reactor Tap % 100.0 80.0 60.0 40.0 20.0 0.0REACTANCE at PCCVOLTAGE

Supply 2.0 2.0 2.0 2.0 2.0 2.0

Step Down Transformer 16.8 16.8 16.8 16.8 16.8 16.8

Arc Furnace Transformer 16.1 16.1 16.1 16.1 16.1 16.1Furnace Secondary 44 44 44 44 44 44

Series Reactor 50 40 30 20 10 0

Total reactance 128 118 108 98 88 78

FLICKER CALCULATIONS

Maximum reactive power at PCC Mvar 94 102 112 123 137 154

QSVC Mvar 90 90 90 90 90 90

Arc furnace severity factor 75 75 75 75 75 75

Flicker Pst without SVC ( 99 %) 1.177 1.276 1.394 1.536 1.709 1.927


Compensation Ratio 0.96 0.88 0.81 0.73 0.66 0.58

Max reduction factor of SVC 2.059 2.086 2.064 1.997 1.897 1.779Flicker Pst (95%) with SVC 0.457 0.490 0.540 0.615 0.721 0.867

Background Flicker Pst (95%) 0 0 0 0 0 0

Total Flicker Pst (95%) 0.458 0.490 0.541 0.616 0.721 0.867


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ANNEXURE 3

Table 1 : Flicker Calculations (MVAsc = 600 MVA)

Case 1 Case 2 Case 3 Case 4 Case 5 Case 6

GRIDShort Circuit Power at PCC MVA 2.700 2.700 2.700 2.700 2.700 2.700

STEP DOWN TRANSFORMER:

Primary Voltage KV 110 110 110 110 110 110

Secondary Voltage KV 22 22 22 22 22 22



FURNACE TRANSFORMER:

Primary Voltage KV 22 34.5 34.5 34.5 34.5 34.5

Secondary Voltage KV 0.85 0.85 0.85 0.85 0.85 0.85


Short Circuit Impedance % 8.00 8.00 8.00 8.00 8.00 8.00FURNACE

Secondary Impedance m 2.6 2.6 2.6 2.6 2.6 2.6

Series Reactor Impedance 2.00 1.60 1.20 0.80 0.40 0.00

Series Reactor Tap % 100.0 80.0 60.0 40.0 20.0 0.0REACTANCE at PCCVOLTAGE

Supply 4.5 4.5 4.5 4.5 4.5 4.5

Step Down Transformer 16.8 16.8 16.8 16.8 16.8 16.8

Arc Furnace Transformer 16.1 16.1 16.1 16.1 16.1 16.1

Furnace Secondary 44 44 44 44 44 44

Series Reactor 50 40 30 20 10 0

Total reactance 131 121 111 101 91 81

FLICKER CALCULATIONS

Maximum reactive power at PCC Mvar 92 100 109 120 133 149

QSVC Mvar 90 90 90 90 90 90

Arc furnace severity factor 75 75 75 75 75 75



Compensation Ratio 0.97 0.90 0.83 0.75 0.68 0.60

Max reduction factor of SVC 2.045 2.084 2.074 2.017 1.924 1.809

Flicker Pst (95%) with SVC 1.004 1.067 1.169 1.321 1.537 1.836Background Flicker Pst (95%) 0 0 0 0 0 0

Total Flicker Pst (95%) 1.004 1.067 1.168 1.320 1.536 1.835


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ANNEXURE 3

4.2.2.3. Switchgear Equipments

There will be two 72.5 kV circuit breakers of SF6 type in the SVC system. Circuit breakers should

have the capability of breaking capacitive current and should be re-strike free. Configuration will

be as follows:1st Circuit Breaker : TCR+2nd HF

2nd Circuit Breaker : 3rd HF+4th HF

4.2.2.4. Surge Arresters

There will be line-earth connected surge arresters at the load side of each circuit breaker.

There will be line-to-line connected surge arresters at the load side of 1st circuit breaker (TCR+2nd

HF).


The rated power of the thyristor controlled reactors is 90 MVAr at 22 kV and this corresponds to a

rated current of 1363 Arms in delta-connected reactors. Maximum continuous overloading of the

reactors is +10 %. Hence, maximum continuous current of the reactors is 1500 Arms.

4.2.2.6. Harmonic Filters

SVC has been designed at 90 MVAr capacitive reactive power has been divided into threeharmonic filters.

The ratings of the filters are as follows:

- 2nd Harmonic Filter 25 MVAr at 22 kV (C-Type)

- 3rd Harmonic Filter 35 MVAr at 22 kV

- 4th Harmonic Filter 30 MVAr at 22 kV

4.2.2.7. Thyristor Stack

125 MVAr thyristor stack will be used in order to control TCR. Important specifications of the

thyristor stack are as follows:

- There will be 13 series thyristor pairs and 1 of them will be used for redundancy.

- The thyristor stack will have the ability to be switched off and successfully block the applied

voltage at 1.3 p.u. primary voltage.

- De-ionized water cooling system will be used for the cooling of the thyristor stack.4.2.2.8. Water Cooling System

Thyristor stacks will be cooled by a water-to-water de-ionized cooling system.

Industrial cooling water will be used in the primary circuitry of water cooling system.

There will be two pumps and one heat-exchanger in water cooling system.


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ANNEXURE 3

4.2.3. Specifications of SVC Components

4.2.3.1. Switchgear Equipments

Switchgear equipments are under the responsibility of BUYER. If the technical specifications ofthe Existing circuit breakers are not suitable, new circuit breaker specifications will be given by

SELLER in Basic engineering stage.

4.2.3.2. Surge Arresters

Manufacturer : ABB

Model : POLIM H Series

Nominal Discharge Current In 8/20 s : 20 kA (pk)

Line discharge class : 4

High current impulse/hc 4/10 s : 100 kA (pk)

Long duration current impulse : 1350 A / 2000 s

Short Circuit Rating Is 50 Hz : 63 kA (rms) for 0.2 s

Classification according to IEEE (ANSI) C62.11 : Station Class High Energy


Outdoor Installation

Dry insulated

Air-cored

Two coils per phase (stacked one above the other)

Equipped with silicon coating

Very Heavy pollution (31mm / kV creepage)

Rated voltage : 22 kV

Max. cont. operating voltage : 24.2 kV

Rated frequency : 50 Hz

Rated current : 1500A fund / 1600A rms

Tolerance : % 0 to -3Insulation level : 70/170 kV

Temperature class : F

Cooling method : AN

Standard : IEC 60076-6


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ANNEXURE 3

4.2.3.4. Harmonic Filters

Rated voltage : 22 kV

Max. cont. operating voltage : 24.2 kV

Rated frequency : 50 HzCooling method : AN

Creepage distance : 31 mm / kV

Insulation : 70/170 kV

2nd Harmonic Filter

Tuned Frequency : 100 Hz

Rated Power : 25 MVAr

3rd Harmonic Filter



4th Harmonic Filter



All filter banks are tuned harmonic filters. Connection type is double Y (Y-Y). The unbalanceprotection is implemented by a current transformer which is connected between the neutralpoints.

4.2.3.4.1. Harmonic Filter Reactors

Dry type

Air-core

Inductance : 20.68 mH/phase (2nd HF)

5.73 mH/phase (3rd HF)

3.50 mH / phase (4th HF)

Tolerance : < 2 %

Rated Current : 721A fund / 736A rms (2nd HF)

1010A fund / 1085A rms (3rd HF)

866A fund / 890A rms (4th HF)

Mounting : Outdoor

Design : 3S


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ANNEXURE 3

BIL : 70/170 kV

Insulation Class : F

Pollution : High

Standard : IEC 60076-6

4.2.3.4.2. Harmonic Filter Capacitor Banks

Double-Y Connected Capacitor Bank

Rated voltage / power : 40 kV / 61.88 MVAr (2nd HF)

36 kV / 82.92 MVAr (3rd HF)

31 kV / 55.77 MVAr (3rd HF)

Insulation level (BIL) : 70/170 kVInstallation : Outdoor

Pollution : High

Altitude : 110 kV peak

Number of Thyristor in Series : 13 / phase (Redundancy :1)

Cooling : De-ionized water coolingTemperature of Inlet Water : 40 C max.

Water Flow : > 300 lit/min.

Altitude :


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ANNEXURE 3

4.2.3.6. Water Cooling System

Pure Water Circuit

Cooling capacity : > 300 kW

Cooling liquid : Glycol-de-ionized waterDesign pressure : 10 bar

Test pressure : 10 bar

Max. coolant temp. to cooling object: 40 C

Industrial Cooling Water

Maximum water temperature : 35C

Minimum water temperature : 10C

Chlorine content : < 100 mg / l

Ph Value : 7-9

Size of Particles : < 0.2 mm

4.2.4. Control, Protection and Monitoring Systems

4.2.4.1. Control System

RPCS system will control the reactive power flow by using a fully digital control system, and

generate corresponding firing signals. Control system is based on Digital Signal Processors (DSP)

of Texas Instruments TMS320 family. Following requirements are achieved by DSP boards :

Control of SVC system

Digital protections (TCR current limiting, TCR DC unbalance & overload protections)

Current, voltage, harmonics, active and reactive power measurements

Trigger pulse supervision is included in the control system.

The supervisory controls of the system are employed by PLC.

Control modes of the control system are explained below:

Closed Loop Control Constant Power Factor

In this mode, the user can select a power factor reference. The aim of this control is to regulate thepower factor at the 22 kV bus.

Closed Loop Control Constant Reactive Power

In this mode, the user can select a reactive power reference. The aim of this control is to regulatethe reactive power at the 22 kV bus.


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ANNEXURE 3

Closed Loop Control Voltage Control

In this mode, the user can select a p.u. voltage reference. The aim of this control is to regulate thebus voltage at the 22 kV bus.

Manual Control Constant Susceptance

In this mode, the user can select the susceptance value of the TCR. Therefore, TCR can beoperated at a fixed triggering angle at this mode.

4.2.4.2. Protection System

Protection relays will be used for the protection of thyristor controlled reactors and harmonic

filters. List of protections are given in Table-3. Protection relays will be chosen from ABB.

Table-3 : SVC System Protections

Relevant System Part Protection Type Protection Relay

22 KV Bus Over/Under Voltage Supplied by Buyer

22 KV SVC Feeder Over Current, Overload, Earth Fault Supplied by Buyer

22 KV Feeder 1(TCR and 2nd Harmonic Filter)

Over Current, Overload, Earth Fault 7SJ62 (Siemens)

22 KV Feeder 1(TCR and 2nd Harmonic Filter)

Over Current, Overload, Earth Fault 7SJ62 (Siemens)

TCR Over Current, Overload SPAJ 140C (ABB)

Harmonic Filters Capacitor bank Protection SPAJ 140C (ABB)

4.2.4.3. Human Machine Interface (HMI) System

HMI system is used in order control the SVC system and also for the supervision of SVC system.

HMI system is based on Siemens made 15.1 Industrial PC, with touch panel. Screens available on

the HMI systems are given below:

Screen 1- SVC Control and Real Time Single Line Diagram

Following controls are done from Screen 1.

ON/OFF of SVC Circuit Breakers

SVC start/stop

Control Mode Selection

Water Cooling System start/stop


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ANNEXURE 3

Following details are shown on this screen.

Position of SVC system circuit breakers

22 kV Bus Voltage and voltage harmonics

110 kV Bus Voltage and voltage harmonics 110 kV active & reactive powers, current harmonics, power factor, THD

SVC currents, reactive powers (TCR and HF separately)

EAF and LF currents

Screen 2 - Thyristor Monitoring Screen

Status of each thyristor is shown in this screen and faulty thyristor can be directly seen from thispage.

Screen 3- Fault and Alarms Screen

Following details are shown on this screen.

- Current faults & alarms are shown on this screen.

- All past fault & alarms are seen on with a sufficiently long memory.

Screen 4 Event Recorder Screen

Recorded events are shown in this screen with a sufficiently long memory.

Screen 5- TCR Diagram

TCR currents (delta and line) are shown in this screen.

Screen 6 - Water Cooling System

Water cooling system diagram is shown in this screen. The following details are available on thisscreen.

Water flow rate

Water conductivity

Main circuit

Main circuit temperature

Status pressure

4.2.5. Auxiliary Power

Auxiliary voltage should be 110V DC and 3 phase 400V AC, 50 Hz.

Maximum continuous DC current that will be drawn from 110V DC is 10 A.

Maximum continuous AC current that will be drawn from 400V AC is 40 A.


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ANNEXURE 3

4.2.6. Panels

All panels will be RITTAL made and have an isolation class of IP 40.

4.2.7. ConstructionStructures will be either hot deep galvanized or aluminum.

4.2.8. Documentation

The following documents will be given by SELLER at the detailed engineering period.

Document List

Operation Manual

Erection Manual

Detailed Material List

Civil Design

All documents, drawings and instruction manuals should use metric units. All design and

calculations should be in accordance with IEC standards including IEC 61000.

5. ERECTION PERSONNEL, TOOL AND EQUIPMENTS

The installation work of SVC system is under BUYERs responsibility. Erection personnel must be

skilled personnel and list of personnel is given in Table-4.

Table-4 : List of Erection Personnel

Personnel Required Number of Personnel

Skilled Mechanics 4-6

Skilled Electricians 2-4

Skilled Welders for TIG or MIG Aluminium welding 2

Crane operator 1 1

Boom truck operator 1 1

Fork lift operator 1 1

Qualifications of the erection personnel will be given after signing the contract.

A mobile crane is required at the plant for 4 days to lift the heavy components. The lifting capacity

of the crane will be 25 tons or higher.

A boom truck and fork lift are required for lifting/unloading less heavy objects.


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ANNEXURE 3

6. GENERAL SPECIFICATIONS

- If any change in the project is to be needed, customer approval shall be taken.

- Basic engineering data will be given after signing of the contract.

- Detailed engineering documents for installation will be given to BUYER before installation work.- AS-BUILT project with all necessary information for operation and maintenance will be given

after the completion of the project.

7. LIST OF PROPOSED SPARE PARTS

TITLE VENDOR QUANTITYCONTROL PANEL

Control and Protection Cards (rack type) Endoks 1 setDC/DC Power Supply Lambda / Phoenix Contact 1 pc

EMI filter EPCOS / Schaffner 1 pcTHYRISTOR VALVESThyristor Westcode / Dynex semiconductors 6 pcs.TCU Board Endoks 3 pcSnubber Capacitor Electronion / Vishay / NCL 2 pc.Snubber Resistor EBG Resistor / Arcol 2 pc.Sharing Resistor EBG Resistor / ARCOL 2 pc.Fibre Optic Cables Avago 2 pc.

TITLE VENDOR QUANTITYCAPACITOR FILTER BANKS

Capacitor unit (2nd HF) Energi 3 pc.Capacitor unit (3rd HF) Energi 3 pc.Capacitor unit (4th HF) Energi 2 pc.PROTECTION RELAYS

Protection Relay SPAJ 160 C ABB 1 pc.SURGE ARRESTOR

POLIM H 26 N ABB 1 pc.POLIM H 35 N ABB 1 pc.WATER COOLING SYSTEM

Pump Seal Kit Swedewater 1 pc.Filter Cartridge Swedewater 5 pc.Strainer Swedewater 1 pc.Conductivity Sensor Swedewater 1pc.Flow Meter Repair Kit Swedewater 1pc.Temperature Switch Swedewater 1pc.Thermometer Swedewater 1pc.Pressure Switch Swedewater 1pc.Deionizer Filter Swedewater 1pc.

Documents

EC_QM_3571_Nang Giang Co. Ltd-1