The voltage withstand test for current transformers (CTs) is conducted to ensure the insulation integrity of the CT and its ability to withstand overvoltages. Here is a general procedure for performing a voltage withstand test on a current transformer:
To guide the responsible persons in conducting Current Transformer Voltage Withstand Test.
SAFETY PRECAUTIONS – The following Safety precautions shall be taken in consideration prior, during and after conducting the test measurements.
- Safety tagging shall be implemented.
- Isolate the Area by Safety Warning Tape.
- Keep a Safe Distance from the device being tested.
- Wear Appropriate Personal Protective Equipment(PPE) Prior to starting any testing activity.
- Implementation of Proper Grounding.
Voltage Withstand Test Procedure
TEST EQUIPMENTS: OMICRON CPC-100
- Setup the CALIBRATED test instrument in a firm, reasonably level base and dry area.
- Identify test parameters and terminals for proper connections.
- Set-up and effectively ground the test instrument. Supply voltage, 110Vac or 230Vac. Conduct testing as per the
following illustrated test Connections:
- Power ON the Test Instrument and select VWithstand Test Card
- Properly fill-up test settings:
- Press I/O (test start/stop) push-button to start the test.
- Save test card for printing.
7.1 For multi-tap core/s, create and save test card for each tap tested. - Note and record all necessary test parameters in standard test forms
- Evaluate test result as per general standard ratings.