M/s C and I Calibrations Pvt. Ltd, is a NABL Accredited Calibration and Testing Laboratory. The prime aim of this unit is to provide solution in managing calibration and Testing looking to the needs of the various industries in this region govt. organizations and private sectors.
Potential transformer :-
Potential transformer is a voltage step-down transformer which reduces the voltage of a high voltage circuit to a lower level for the purpose of measurement. These are connected across or parallel to the line which is to be monitored.
Testing Procedures
- Insulation Resistance test.
- Voltage Transformer Ratio & Polarity test.
- Winding Resistance test.
Equipment Required
- CPC 100 for VT Ratio & Polarity test.
- Insulation Resistance tester: Megger mit1020.
- Multimeter.
- Micro ohm meter: Drlo10
Insulation Resistance Test
- Use Megger mit1020 to measure insulation resistance.
- Insulation Resistance Tests to be done:
- Primary winding – Ground (Apply 1kV for 1 minute)
- Primary winding – Secondary winding (Apply 500V for 1 minute)
- Secondary winding – Secondary winding (Apply 500V for 1 minute)
- Secondary – Ground (Apply 500V for 1 minute)
VT Ratio & Polarity Test
- Use Omicron CPC100 to test VT ratio & polarity.
- Connection on CPC100 will be same as the shown figure.
- Repeat the test for the other phases and the other secondary cores.