User Manual PCT100i EN V1 - Home - €¦ · Internal linear amplifier, ... Entering the main menu and selecting the burden measuring unit, CT secondary burden ... While doing the

PCT100i Operation Manual

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PONOVO POWER CO., LTD

2F, 4Cell, Tower C, In.Do Mansion

No.48A Zhichun Road, Haidian District

Beijing, China (Post Code 100098)

Office TEL. +86 (10) 82755151 ext. 8887

FAX +86 (10) 82755257

E-Mail [email protected]

Website www.ponovo.com.cn

PCT100I

OPERATION MANUAL

VERSION: PCT100I-AE-1.10

DATE: 14/07/2011

This manual is the publication of PONOVO POWER CO., LTD. Any form of copy should obtain the

consent of it.

This manual represents the technical status for the moment of publishing. The product information,

description and specifications mentioned in the manual do not have any contact binding force and

PONOVO POWER CO., LTD remains the right to make modifications to the technical

specifications and configurations without prior notice. PONOVO POWER does not take

responsibility to the possible error/mistakes in this manual.


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Content

1. General Description ....................................................................................................... 5

1.1 Functions .............................................................................................................. 5

1.2 Features ............................................................................................................... 5

1.3 Operation Preparation .......................................................................................... 6

2. Panel Description ........................................................................................................... 8

3. Technical Specification ................................................................................................... 9

3.1 Output and Input ................................................................................................... 9

3.2 Main Supply .......................................................................................................... 9

3.3 Environment Conditions ........................................................................................ 9

3.4 Dimension and Weight ........................................................................................ 10

4. Operation Instruction ................................................................................................... 11

4.1 Select Test Functions .......................................................................................... 11

4.2 Set Test Parameters ........................................................................................... 11

4.3 Control Output .................................................................................................... 12

4.4 Save Test Report ................................................................................................ 12

5. Burden Test .................................................................................................................. 14

5.1 Wiring Connection .............................................................................................. 14

5.2 Test Operation .................................................................................................... 15

6. CT Test ........................................................................................................................ 16


6.2 Test Operation .................................................................................................... 17

6.2.1 Settings .................................................................................................... 17

6.2.2 Rct Measuring .......................................................................................... 18

6.2.3 Demagnetization ....................................................................................... 19

6.2.4 Polarity Check .......................................................................................... 20

6.2.5 Excitation Test .......................................................................................... 21

6.2.6 Ratio Test .................................................................................................. 25

6.2.7 Auto Test ................................................................................................... 26

6.3 Application Examples.......................................................................................... 27


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6.3.1 Transmission line CT Test ......................................................................... 27

6.3.2 CT Test in Y Voltage Transformer ............................................................. 28

6.3.3 CT Test in the Star Connection Voltage Transformer ................................ 29

6.3.4 Bushing CT Test ....................................................................................... 30

6.3.5 Test CT with Tapping ................................................................................ 31

7. PT test ......................................................................................................................... 32


7.1.1 Polarity and Ratio Test .............................................................................. 32

7.1.2 Excitation Test .......................................................................................... 34

7.2 Test Operation .................................................................................................... 35

7.2.1 Settings .................................................................................................... 35

7.2.2 Polarity and Ratio Test .............................................................................. 35

7.2.3 Excitation Test .......................................................................................... 36


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Notes：

In order to prevent static electricity, the tester must be connected to ground

before testing.

Avoid electric shock accident when the output voltage is above 36V.

Short circuit is prohibited at output side while testing.

Connect wires in accordance with instructions.

External voltages and currents are prohibited to apply on the tester’s output.

Avoid the equipment being wet by rain.

Contact manufacturer timely and do not repair it when device works abnormally.


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1. General Description

1.1 Functions

CT testing：

Secondary side burden test

Secondary side winding resistance test

Excitation test with automatic calculation of knee point

Polarity test

Ratio test

Ratio and angular difference at rated load

Demagnetization

PT Testing：

Polarity test

Ratio test

Excitation test

1.2 Features

Testing CT by voltage method

Based on frequency test principle and can test knee point voltage up to 20kV

Requiring low output voltage and power. Portable design with small size and lightweight

Whole machine integration design, adopting anti-vibration and anti-electromagnetic

interference combination chassis.

Embedded microprocessor digital platform without external PC, easy to operate and


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finishing automatic testing in a few seconds.

Testing results can be led out by U disk.

Internal linear amplifier, fast response time, high precision and reliability. With maximum

output AC voltage 120V, maximum output current 5 Arms.

1.3 Operation Preparation

Preparation:

CT secondary side load loop disconnection and secondary winding off-grounded

CT primary side disconnects with busbar

Order of connection:


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Utility line

Burden

1

2

3

4

5

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1. The chassis of PCT is grounded.

2. One end of CT primary side grounded (P2)

Note: There is a grounding switch in one side of primary. No matter the grounding switch is in P1

or P2, only one end is supposed to ground.

3. The test lead connects with P1, P2 of CT.

4. The other end of the lead connects with P1, P2 of PCT100i.

5. One secondary side connects with one group of CT’s S1 and S2

6. The other Secondary side connects with S1, S2 of PCT100i.

7. Power on


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2. Panel Description

1) Connecting CT secondary side

2) Secondary side voltage test while testing CT

3) Primary side voltage test while testing CT

4) Connecting PT primary side

5) Secondary side voltage test while testing PT

6) Run lamp: output indicator--flashing while outputting

Stop lamp: indicating output stop--flashing without output

7) Rotary encoder: selecting menu and setting specifications

8) USB interface: lead-out report by U disk

9) Instrument chassis ground terminal

10) Power switch

11) Function control button

12) LCD display


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3. Technical Specification

3.1 Output and Input

Voltage output range: 0～120V

Current output range: 0～5Arms

Max. ratio: 30,000：1 ，45,000：5

Accuracy: ±0.2％

Max. Knee point voltage: 20KV

Secondary burden measuring range: 0.1Ω～100Ω

Secondary burden measuring accuracy: 0.2%±1mΩ

Secondary winding resistance measuring range: 0.1Ω～100Ω

Secondary winding resistance measuring accuracy: 0.2%±1mΩ

Current measuring accuracy: 0.2%+0.2mA

Voltage measuring accuracy: 0.2%+0.2mV

3.2 Main Supply

Input voltage: 110/240 VAC，50/60HZ

3.3 Environment Conditions

Operation temperature: -10～50

Operation humidity：≤90％, non-condensing


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3.4 Dimension and Weight

Aluminum alloy extrusion, EMC enclosure chassis:320mm x364mm x 155（W*H*L）

Weight: 11Kg


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4. Operation Instruction

4.1 Select Test Functions

Choosing main menu button at any interface to enter, then rotating rotary encoder to change the

cursor position and select specified testing button. The selected operation is displayed in white

with background of black, after pushing the rotary encoder, then entering the selected testing

process.

4.2 Set Test Parameters

Change variable parameter by pushing rotary encoder and rotating it clockwise and

counterclockwise.


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4.3 Control Output

Pushing run and stop buttons can control the functions of output and stop output. While output,

the operation indicator will flash.

4.4 Save Test Report

After testing, a U disk should be inserted through the USB interface, selecting the save key,

pushing rotary encoder to save test report which is saved as TXT format. The following picture

indicates the save is in process, and the U disk cannot be pulled out. When the cursor moves

automatically from save unit to parameter setting, the save process is finished and the U disk can

be extracted.

Notes: Please use the distributed U disk while saving the results.

Other profiles are not permit in the U disk while saving the report. Otherwise, there will be

some mistakes or other profiles will be damaged.


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While pushing rotary encoder to save test report, if it displays like the following picture, the U disk

should be inserted once again or be changed a new one.


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5. Burden Test

5.1 Wiring Connection

Connecting the instrument transformer according to the below direction, while doing secondary

load impedance test.

Wiring direction: The instrument transformer’s output end S1 and testing end S1 are connected

with the secondary load side of the CT.

The instrument transformer’s output end S2 and testing end S2 are connected

with the other side of secondary load of the CT.


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5.2 Test Operation

Entering the main menu and selecting the burden measuring unit, CT secondary burden

measuring can be done. After entering burden measuring unit, the process can automatically run

after pushing the button. The testing result is displayed in Z zone. It stops automatically and the

lamp turns off.


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6. CT Test


While doing the CT secondary coil resistance, polarity, excitation demagnetization and ratio test,

The instrument transformer tester should be connected according to the below diagram.

Wiring direction: The instrument transformer’s output side S1 and testing side S1 are

connected with the secondary side of the CT.

The instrument transformer’s output side S2 and testing side S2 are

connected with the other side of secondary side of the CT.

The instrument transformer’s primary test side P1 is connected with one

side of the CT primary test.

The instrument transformer’s primary test end P2 is connected with the

other side of the CT primary test.


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6.2 Test Operation

6.2.1 Settings

The CT parameters are set by rotary encoder properly; otherwise, the test results are not correct.

f: rated frequency; VA: rated capacity; COSφ: power factor; P/TP: the CT type; I-sn: secondary

side rated current; I-pn: primary side rated current; Substation: name of substation; Standard: test

standard based on; Winding: the number of the winding; SN: the serial number of the winding;

Date: date of test.


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6.2.2 Rct Measuring

CT secondary winding resistance test can be done after selecting the Rct measuring unit.

Entering the Rct measuring unit, the temperature of rotary encoder is present test temperature.

The secondary side winding resistance test will automatically run after pushing the run button. The

test results display at R. R75 is the resistance at 75. After testing, it stops automatically and

the lamp is off.


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6.2.3 Demagnetization

CT demagnetization can be done after selecting the demagnetization unit. The process will

automatically run when entering the unit and pushing the run button. After the process, it will

automatically stop and the lamp is off.


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6.2.4 Polarity Check

CT polarity check can be done after selecting the polarity check unit. The polarity check is

automatically finished while pushing the run button. It stops automatically and the lamp is off. The

test method is negative polar.


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6.2.5 Excitation Test

CT excitation test can be done after selecting the excitation unit.

The test will automatically run while entering the excitation unit. It stops automatically after test

and the lamp is off.

The test result displays in curve, and the voltage and current are shown at knee point. Pushing

rotary encoder will go back to the top.


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After excitation curve test, V-A data should be selected.

Every voltage and current can be checked while entering the V-A data. The voltage and current

are displayed at lower right corner in the diagram.


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Select “3” through rotary encoder as illustrated in the below diagram.

Push rotary encoder and enter the below interface. Any 10 sets of excitation data can be checked

in the unit.


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The excitation current can be changed by moving cursor to any set of excitation current and

the relative excitation voltage is automatically displayed. The step can be also changed

according to “coarse/fine”. The coarse step is 0.1A, and the fine step is 0.001A.

>

After setting the excitation current, moving cursor to “ ” and pushing rotary button, the 10 sets excitation current values are automatically saved in the FLASH, and they will be led out

automatically next power-on.


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6.2.6 Ratio Test

Firstly do RCT test to make sure the angular difference before doing CT ratio.

The angular difference and ratio show the error at rated load.

CT ratio test can be done after selecting the ratio test unit and pushing run button. When the test

is completed, it stops automatically and the lamp is off.


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6.2.7 Auto Test

CT excitation, polarity, ratio, secondary side winding resistance and demagnetization tests all can

be done after selecting auto test unit and pushing run button. When it is finished, the test

automatically stops and the lamp is off. Ratio, excitation knee voltage, polarity, secondary side

resistance test result can be checked in this unit. Excitation test result should be checked in

excitation unit.


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6.3 Application Examples

6.3.1 Transmission line CT Test


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6.3.2 CT Test in Y Voltage Transformer

In order to reduce interference, other windings of the CT voltage transformer should be short

circuit.


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6.3.3 CT Test in the Star Connection Voltage Transformer

In order to reduce interference, other voltage transformer’s windings should be short circuit.


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6.3.4 Bushing CT Test In order to reduce interference, other windings of the CT voltage transformer should be short

circuit.


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6.3.5 Test CT with Tapping

All the windings in the same shank are all switched on while testing CT with tapping.


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7. PT test


7.1.1 Polarity and Ratio Test

Connect instrument transformer tester as illustrated in below when doing PT polarity, ratio test.


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Wiring directions：The output A of transformer is connected with one side of PT primary.

The output N of transformer is connected with one side of PT primary.

The secondary testing end “a” of transformer is connected with one side of

PT secondary.

The secondary testing end “n” of transformer is connected with

the other end of PT secondary.

Note: The wiring for primary and secondary cannot be wrong, otherwise, it may give thousands of

voltage.


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Connect transformer tester as illustrated in below when doing PT excitation test.

Single-phase voltage transformer

Three-phase voltage transformer

Wiring directions: The output S1 of transformer is connected with one side of PT secondary.

The output S1 of transformer is connected with the other side of PT

secondary.

PT primary end is connected with a reliable ground, and other windings are

open circuit.

Notes: Keep off the instrument, in case that thousands of voltage may occur while doing

excitation test.


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7.2 Test Operation

7.2.1 Settings

U-an is rated voltage of secondary and is set as PT secondary rated voltage.

7.2.2 Polarity and Ratio Test

The PT polarity, ratio test can be automatically finished after selecting polarity ratio and pushing

run button. It stops automatically and the lamp is off.


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Select PT test unit, and then choose excitation test.

PT excitation is finished automatically when selecting V-A Curve and pushing rotary button. It

stops automatically and the lamp is off.

After testing excitation curve, every voltage and current on the excitation curve can be checked in

V-A Data.

Documents

User Manual PCT100i EN V1 - Home - €¦ · Internal linear amplifier, ... Entering the main menu and selecting the burden measuring unit, CT secondary burden ... While doing the