Ponovo PCT200 Series User manual

PCT200 Series C T / P T Te s ting System User Manual
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PONOVO POWER CO., LTD
No. 139 Jinghai Third Road, BDA, Beijing, China, 100176
Office TEL. [phone]
E-Mail [e-mail]
Website www.ponovo.net
PCT200 Series CT/PT Testing System
User Manual
VERSION: PCT200 -AE-1.50
DATE: FEB. 2023
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 explicitly exonerates
itself from all liability for mistakes in this manual

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Notes：
In order to prevent static electricity, the PCT and test CT must be connected to
ground safely before test.
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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Special Tips:
1. CT/PT testing system (called PCT) is applied in the electromagnetic and low leakage flux
current transformer (CT without gapped core or compensation) and inductive voltage
transformer (PT) of power system. It completes the following test items:
CT load impedance
CT secondary coil resistance (Rct)
CT excitation characteristic
CT ratio
CT polarity
PT ratio and polarity
PT excitation characteristic
……
PCT is used in the above fields and the wiring connection/ operations should be executed in the
guide of the user manual. Any other usage is invalid. The users must operate PCT in the proper
way. Otherwise, improper operation might cause damage. The manufacturer will not take any
responsibility for such damages. The users assume all responsibilities and risks.
2. The power supply must be accordance with the requirements described in user manual.
3. Users can’t maintain the PCT without manufacturer’s authorization. Otherwise the warranty
period statement is invalid.
4. Users can’t disassemble the PCT without manufacturer’s authorization. Otherwise the
warranty period is invalid.

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5. It is prohibited to maintain reform, extend or change the system or any other accessories.
6. Only original accessories are accepted in test and detection process.
7. Do not switch-on and operate PCT in the place having explosive gas or water vapor
8. Avoid the equipment to be wet by rain
9. Do not block the ventilation outlets
10. Don’t stand rightly under the joint point in case of clamps hurting.
11. It is not allowed to connect or disconnect the test object in the operation process. The high
voltage caused by energy, storing in external inductance, might damage the human, PCT and
test object.
12. Make sure that the terminals of the test objects are not charging to exit the program.
13. Please make wiring connection in the guide of user manual while making CT test. If the wiring
is wrong, the high voltage might damage the CT or PCT.
14. Please make wiring connection in the guide of user manual while making PT ratio and polarity
test. If the users connect the PCT output with the secondary side of PT, thousands of volts
high voltage might be generated in the primary side and damage the PT or PCT.
15. Please make wiring connection in the guide of user manual while making PT excitation test.
The PCT output must be connected with the secondary side of PT. If it is connected with the
primary side of PT, it might damage the PT or PCT.
16. The test of guess nameplate is only for reference.

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Content
1. General Description .................................................................................................................. 7
1.1 Functions............................................................................................................................. 7
1.2 Technical Specifications ...................................................................................................... 9
1.3 Features .............................................................................................................................11
1.4 Operation Preparation....................................................................................................... 12
1.5 Block Diagram................................................................................................................... 13
2. Panel Description .................................................................................................................... 14
3. Operation Instruction............................................................................................................... 15
3.1 Set Test Parameters.......................................................................................................... 15
3.2 Select Test Functions ........................................................................................................ 16
3.3 Control Output................................................................................................................... 17
3.4 Save Test Report............................................................................................................... 17
4. CT Test .................................................................................................................................... 18
4.1 Wiring Connection............................................................................................................. 18
4.1.1 Transmission line CT Test....................................................................................... 20
4.1.2 CT Test in Delta Connection Transformer .............................................................. 21
4.1.3 CT Test in the Star Connection Transformer .......................................................... 22
4.1.4 Bushing CT Te st ...................................................................................................... 23
4.1.5 Test CT with Tapping............................................................................................... 24
4.1.6 Test CT in GIS......................................................................................................... 25
4.2 Testing process ................................................................................................................. 26
4.2.1 Settings ................................................................................................................... 26
4.2.2 Settings for Different CT ......................................................................................... 27
4.3 CT Auto Test...................................................................................................................... 30
4.3.1 Test Process ........................................................................................................... 30
4.3.2 Assessment............................................................................................................. 32
4.4 CT Test for Single Item...................................................................................................... 35
4.4.1 Polarity Test ............................................................................................................ 35
4.4.2 Rct Measuring......................................................................................................... 36
4.4.3 Demagnetization..................................................................................................... 37

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4.4.4 Excitation Test......................................................................................................... 38
4.4.5 Ratio Test ................................................................................................................ 40
5. Burden Test ............................................................................................................................. 41
5.1 Wiring Connection............................................................................................................. 41
5.2 Test Operation................................................................................................................... 42
6. PT test ..................................................................................................................................... 43
6.1 Wiring Connection............................................................................................................. 43
6.1.1 Polarity and Ratio Test............................................................................................ 43
6.1.2 Excitation Test......................................................................................................... 45
6.2 Test Operation................................................................................................................... 46
6.2.1 Settings ................................................................................................................... 46
6.2.2 Polarity and Ratio Test............................................................................................ 47
6.2.3 Excitation Test......................................................................................................... 48
7. Report...................................................................................................................................... 49
7.1 Report Save and Copy...................................................................................................... 49
7.2 PCT Report Tools User Manual ........................................................................................ 52
8. Troubleshooting....................................................................................................................... 67
Appendix A: Glossary ..................................................................................................................... 69
Appendix B: CT Test Items............................................................................................................. 71

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1. General Description
1.1 Functions
PCT200i PCT200Ai
CT
CT type P, T P, M P, T P, M (0.2S)
Ratio ◆◆
Polarity ◆◆
Coarse ratio ◆◆
Guess ratio ◆◆
Turn-ratio and error ◆◆
Ratio error and phase
displacement
◆◆
Rct ◆◆
Burden ◆◆
Excitation characteristic ◆◆
CT demagnetization ◆◆
Knee point (V-I) ◆◆
Remanence flux (Kr) ◆◆
Secondary time constant (Ts) ◆◆
Unsaturated inductance (Lm) ◆◆
Saturated inductance (Ls) ◆◆
Instrument security factor (FS) ◆◆
Accuracy limit factor (ALF) ◆◆
Composite error (εc) ◆◆
Eal ◆◆

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Notes: The symbol “◆” indicates it has the function.
The symbol “△” indicates assessment not to guarantee the accuracy.
The symbol “/” indicates it doesn’t have the function.
Transient dimensioning factor (Ktd) ◆◆
Symmetrical short-circuit current
ratio (Kssc)
◆
◆
Peak instantaneous (total) error εˆ ◆◆
Guess nameplate △△
Report tools ◆◆
PT
Ratio △△
Polarity ◆◆
Excitation characteristic △△
Burden △△

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1.2 Technical Specifications
Items
PCT200i
PCT200Ai
Output voltage range 0-120V
Output current range 0-5Arms (15A peak)
Output power 0.0001-500VArms (1500VA peak)
100% Ipn and 100% VA
Ratio test range 30,000:1-45,000:5
Ratio test accuracy﹡
1-2,000 0.05% Typ.
0.10%Gur
2,000-5,000,0.08%Typ.
0.15%Gur
5,000-30,000, 0.10%Typ.
0.20%Gur
1-2,000 0.02% Typ.
0.05%Gur
2,000-5,000,0.03%Typ
0.10% Gur
5,000-30,000, 0.05%Typ.
0.20%Gur
Turn ratio range
1~30,000
Max. knee point
voltage 45,000V
Burden test accuracy ±0.05% ±1mΩ Typ. ±0.1% ±1mΩ Gur.
Winding resistance test
range 0~1,000Ω
Winding resistance test
accuracy
±0.05%±1mΩ Typ. ±0.1%±1mΩ Gur.
Winding ratio accuracy 0.1% or 1 turn
Phase displacement﹡1min Typ. 3min Gur.
resolution 0.01min
1min Typ. 2min Gur.
resolution 0.01min
Temperature
compensation -20℃~120℃
Main supply
110~240Vac / 50~60Hz
90-260Vac / 45~65Hz
Input power: max 2,000VA
Operation temperature
-10
℃
~50
℃

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Storage temperature
-25
℃
~70
℃
Relative humidity 5%~95% non-condensing
Dimensions 470x200x245mm (WxHxL)
Weight 10kg 14kg
LCD display 8.4-inch, color display
Operating system Windows 7/XP
Note: The corresponding temperature of each parameter is 23℃±5℃. It is suggested the preheat
time is longer than 15 minutes.
The symbol “﹡” indicates the knee voltage is more than 3V.

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1.3 Features
Apply the newest principle of multi point DC method and meet the standard of IEC 60044-6
The voltage measurement of ratio and phase displacement complies with standard of IEC
61869-2.
Calibration certificate approved by National Center for High Voltage Measurement. The report
includes: angle differential, ratio differential test and stability test.
8.4-inch LCD with colorful graphical interface for HMI.
The whole integration structure, anti-vibration and anti-electromagnetic interference
combination chassis.
Built-in computer for operation. All test items are completed automatically.
Light weight and small dimension due to small voltage and power output.
The voltage measurement is used to test the bushing CT and GIS CT that can’t be measured
by traditional way.
The knee point voltage of CT ranges from 1-45,000V. And the excitation characteristic test
speed is fast. These features surpass that of traditional analyzer.
Apply to various types of CT (including TP type) excitation, ratio, polarity, secondary winding
resistance, load, ratio differential and angle differential etc steady-state or transient
characteristic test.
Automatically test knee point voltage/ current, ALF, FS, Ts, and Kr etc CT parameters.
Users can select ten groups of excitation data to save.
It lists the ratio error and phase error table and changes the report data in condition the rated
current 1%-300% be set.
The PCT automatically memories test items, report items, and report setting items.
The report can be converted into EXCEL format. More than thousands of reports are saved in
it for checking and printing.
Users can export the test results by USB disk as well as upgrade.
The report tool software is convenient for report saving, converting and analyzing which is for
data contrast, judgment and assessment.
User-defined test according to the defined standards.
PT test items: ratio, polarity and excitation curve.

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1.4 Operation Preparation
Preparation:
CT secondary side load loop disconnection and secondary winding off-grounded
CT primary side disconnects with busbar
Order of connection:
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 C T.
4. The other end of the lead connects with P1, P2 of PCT.
5. One secondary side connects with one group of CT’s S1 and S2
6. The other Secondary side connects with S1, S2 of PCT.
7. Power on

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1.5 Block Diagram

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2. Panel Description
1) Connecting CT secondary side for output (PT secondary for excitation)
2) Connecting CT secondary side for measurement (PT secondary for excitation)
3) Connecting CT primary side for measurement
4) Connecting PT primary side for output
5) Connecting PT Secondary side for measurement
Please refer to the Wiring Connection in chapter 4.1 and 5.1 for CT and PT.
6) Grounding indicator: When the PCT200 is not connected with grounding cable, the indicator
will be on.
7) Run button/ indicator: Press run to start the testing and the indicator will be flashing.
8) Stop button: During the testing, press it to stop the present test.
9) Mouse: it is working as mouse.
10) Keyboard
11) USB interface
12) LCD display

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3. Operation Instruction
3.1 Set Test Parameters
Set variable parameters by pushing keyboard and pressing mouse.

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3.2 Select Test Functions
After the CT settings are set, then press CT Auto Test to choose the required CT Te s t Task.

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3.3 Control Output
After the test task is selected, click Run on the interface or press button Run on the panel to start
testing,
During testing, the operation indicator will be flashing.
The test can be stopped by clicking Stop on the interface or press button Stop on the panel.
3.4 Save Test Report
After testing is finished, click Save Report in the CT Auto Test interface or in the Report interface
for report saving.

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4. CT Test
4.1 Wiring Connection
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.
P1
P2
S1
S2
Load
Wiring direction: The transformer’s output S1 and testing side S1 are connected with one
side of CT secondary.
The transformer’s output S2 and testing side S2 are connected with the
other side of CT secondary.
The transformer’s primary test side P1 is connected with one side of CT
primary.
The transformer’s primary test side P2 is connected with the other side of
the CT primary.
The comparison between four-cable and two-cable testing:

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The transformer secondary tap is connected by claps and the following four-cable connection is
applied.
Four-cable connection Two-cable connection
Otherwise, the chuck resistance might affect measuring result and the CT tester might list the
incorrect measuring result.
Four-cable connection: CT output terminal and input terminal are connected with tested objects by
different claps.
Every testing cable needs a clap.---CORRECT
Two-cable connection: Single testing cable is applied in CT output terminal and input terminal. But
the testing cable is connected with the transformer by a public clap.
Two testing cables use a public clap.---INCORRECT
Physics background:
While two-cable is applied, if there is contact resistance in the CT clap, there will be big measuring
error between the differential error and other parameters. Because the contact resistance might
have change when the clap connect or disconnect with CT, the measuring result can’t be
repeated.
The max. contact resistance of two claps will be 0.5 and the max. overload would be 12.5VA. For
this, the lower the CT coil resistance, the bigger the contact resistance’s effect. When testing a
5A CT, such contact resistance might cause a completely wrong result. But if a higher resistance
such as 10Ω, the error can be igored. So the four-cable conection is absolutely applied in 5ACT
testing.

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4.1.1 Transmission line CT Test
Load
S1
P2
S2
P1