Testing and Commissioning

Testing and Commissioning

The testing and commissioning of high voltage electrical equipment is a highly specialised activity with each and every installation being tested by a trained engineer to exacting standards.

Powersystems testing capability covers an extensive range of disciplines, including cable installations, transformers, switchgear, protection, earthing and underground fault location.

Powersystems testing capability covers an extensive range of disciplines.

Cable installations

  • 1kV and 5kV insulation tests
  • DC pressure tests up to 33kV
  • VLF cable testing

Transformers

  • HV & LV winding insulation tests
  • Winding ratio checks
  • Bucholz testing
  • Oil sample and testing (electrical breakdown, acidity, water & PCB content, dissolved gas analysis)

Switchgear

  • AC pressure testing
  • Ductor testing
  • CT’s – Ratio & flick tests, mag curves
  • VT’s – Ratio & polarity checks
  • Functionality checks
  • Protection testing

Protection

  • Primary and secondary injection
  • Timing tests
  • Overcurrent and earth fault relays
  • Directional overcurrent and earth fault relays
  • Differential transformer protection
  • Translay and Solkor feeder unit protection
  • Restricted and standby earth fault relays
  • Generator loss of mains and G59 protection
  • Neutral voltage displacement
  • Transformer auto tapping relays
  • Inter tripping schemes.

Earthing

  • Soil resistivity measurements
  • Final earth electrode resistance

Underground fault location

  • Digital pulse echo

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