To guide the responsible persons in conducting Voltage Transformer Winding Resistance 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.
TEST EQUIPMENTS: OMICRON CPC-100
Winding Resistance Test Procedure
- 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 RWinding Test Card
- Properly fill-up test settings:
- Press I/O (test start/stop) push-button to start the test.
- Save test card for printing.
7.1For multi-tap core/s, create and save test card for each tap tested. - Note and record all necessary test parameters
- Evaluate test result as per general standard ratings and accuracy classes for Voltage transformers.
What is Winding Resistance Test?
A Winding Resistance Test is a diagnostic measurement performed on transformers or other electrical equipment with windings. This test is designed to measure the resistance of the windings in the equipment. The winding resistance is a crucial parameter as it provides information about the condition of the windings, potential issues like loose connections, or problems with the conductors.
The primary purpose of the test is to determine the DC resistance of the transformer windings. This resistance measurement helps in assessing the condition of the winding material, the connections, and identifies any abnormalities.
What procedure is used in winding resistance test?
A low-voltage DC current is injected into one set of windings, and the resulting voltage drop is measured.
Ohm’s Law (V = I * R) is then used to calculate the resistance, where V is the measured voltage drop, I is the injected current, and R is the winding resistance.
This process is repeated for each set of windings in the transformer.
What equipment is used in winding resistance test?
The test is typically performed using a specialized instrument known as a Winding Resistance Tester.
The tester sends a low-level DC current through the winding and measures the resulting voltage.
What are safety considerations during winding resistance test?
Safety precautions are crucial during this test since it involves applying a current to the windings.
Proper safety measures, including using appropriate personal protective equipment and following safety guidelines, are essential.
What is the frequency of winding resistance test?
The winding resistance test is typically performed during routine maintenance or as part of diagnostic testing.
Regular testing helps in identifying potential problems early and allows for timely corrective actions.