High Voltage (HV) Testing of Primary Equipment and Energy Meter Testing

As all sites are different, our engineers will tailor the tests to suit site and client requirements. Bharti Automation regularly carries out the following routine site tests:

Current transformer: CT ratio and phase error, CT magnetising curve, CT secondary DC resistance, CT secondary impedance, CT primary and secondary Insulation resistance, polarity.

Voltage transformer: VT ratio, VT secondary and primary Insulation resistance, polarity. Surge arrestor

Insulation resistance, variable frequency dissipation factor measurement, discharges counter check.

Breaker switch: Contact resistance for all joints including main contact(s), insulation resistance

• Circuit breakers: Contact resistance for all joints including main contact(s), insulation

resistance, trip close timing tests, dynamic resistance measurements

• Bus bars: Partial discharge, conductivity, insulation resistance

• Power transformers: Power transformer testing including winding ratio, vector group, DC

resistance, impedance percentage, tap change continuity, insulation resistance, dissipation

factor (Tan Delta), calibration of thermal sensors. Frequency response analysis, oil test and

analysis, Diana testing.

• Generators: Stator DC resistance, stator zero, positive and negative sequence impedance,

rotor AC and DC impedance, dissipation factor, insulation resistance, polarisation index,

partial discharge measurement.

• Earthling system: Step and touch voltages, system earthling resistance, earthling system

integrity Lines: Positive and zero sequence impedance measurements, ground fault current

compensation factor, mutual coupling of parallel lines, coupling impedances between power

lines, signal cables and pipelines.

• Cables: HV cable testing including VLF with-stand, partial discharge, insulation resistance,

conductivity test.

• Bharti Automation is one of the few laboratories in India who have got Accreditation from

NABL, Govt. of India for Energy Meter Calibration. We provide this service to hundreds of

government and private institutions, Offices, Factories Hospitals, Commercial Complexes etc.