High Voltage (HV) Testing of Primary Equipment Cont..
•Circuit breakers: Contact resistance for all joints including main contact(s), insulation
resistance, trip close timing tests, dynamic resistance measurements
•Busbars: 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 ?), 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.
•Earthing system: Step and touch voltages, system earthing resistance, earthing
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.