Corner Stone Energy provides the following specialist HV testing and commissioning services:

1.  Protection relays: Secondary injection for verification of trip and restraints. Primary injection for trip verification. Protection integration.
2.  Energy meters: Secondary injection for verification of metering, update of registers and integration with other systems such as SCADA.
3.  Rotating machines: Power generator excitation system compliance/performance check (voltage regulation, voltage range, V/F limiter, step response, reactive power capability, excitation ceiling, and excitation limiter).
4.  Switchgear: Contact resistance, insulation resistance, power frequency voltage withstand, functional checks, interlocking, arc flash marking verification.
5.  Instrument transformers (VTs and CTs): Ratio, phase deviation, polarity, burden, winding resistance, insulation resistance, primary injection for VTs and CTs as well as loop resistance and excitation for CTs.
6.  Power Transformers: Ratio, polarity, phase deviation, winding resistance, excitation current, TanDelta.
7.  Circuit Breakers: Timing, contact resistance, dynamic contact resistance, displacement curve, insulation resistance, power frequency voltage withstand, reduced voltage operation.
8.  Power cables: Insulation resistance, VLF voltage withstand, partial discharge.