EEHA Solutions

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HV Switchboard
Online Activities
Offline Activities
  1. Visual inspection of switchboard
    1. Check for any signs of abnormality.
  2. Online testing and monitoring
    1. Check for partial discharge, if online partial discharge monitoring system is installed.
    2. Perform thermography of cable connections, where accessible.Check for phase indication, if insta
  1. Visual inspection of busbar and internal connection including general cleaning.
  2. Insulation resistance (IR) and polarisation index (PI) test on busbar.
  3. Contact resistance (Ductor) test of main connection points.
  4. Any other additional inspections and tests as recommended by the manufacturer.

HV Circuit Breaker
Online Activities
Offline Activities
  1. Visual inspection of circuit breaker
    1. Check for any signs of abnormality such as unusual vibration or noise.
    2. Check for CB counter, where accessible, ensuring it is within the allowable number of switching operations.
  2. Online testing and monitoring
    1. Perform thermography, if IR window is installed.
  1. Visual inspection of all parts for any abnormality.
  2. Insulation resistance (IR) and polarisation index (PI) test.
  3. Static or dynamic resistance test.
  4. Circuit breaker timing test.
  5. Power factor (Tan Delta) test.
  6. Contact resistance (Ductor) test of main connection points.
  7. Circuit breaker trip and open checks.
  8. Charging motor functional test.
  9. Busbar shutter inspection, where it is safely accessible.
  10. Any other additional inspections and tests as recommended by the manufacturer.

Protection Relay
Online Activities
Offline Activities
  1. Visual inspection of protection relay
    1. Check for any active alarms.
  1. Secondary injection test.
  2. Primary injection test.
  3. Trip and close function checks.
  4. Check for any loose wirings.
  5. Replace back up battery, if applicable.
  6. Any other additional inspections and tests as recommended by the manufacturer.

Air Circuit Breaker (ACB)
Online Activities
Offline Activities
  1. Visual inspection of ACB trip unit
    1. Check for any active alarms.
    2. Check for any abnormality such as unusual noise or vibration.
  1. Secondary injection test for trip unit.
  2. Primary injection test for trip unit.
  3. Static or dynamic resistance test of ACB.
  4. ACB timing test.
  5. Insulation resistance (IR) and polarisation index (PI) test.
  6. Trip and close function checks.
  7. Any other additional inspections and tests as recommended by the manufacturer

Current Transformer (CT)
Offline Activities
  1. General visual inspection for any abnormality such as heat damage or discoloration.
  2. CT ratio and phase error test.
  3. CT winding resistance test.
  4. CT excitation and magnetisation curve check.
  5. CT Insulation resistance (IR) and polarisation index (PI) test.
  6. CT circuit continuity checks.
  7. Check for any loose wirings.
  8. Any other additional inspections and tests as recommended by the manufacturer.

Voltage Transformer (VT)
Offline Activities
  1. General visual inspection for any abnormality such as heat damage or discoloration.
  2. VT ratio and phase error test.
  3. VT winding resistance test.
  4. VT Insulation resistance (IR) and polarisation index (PI) test.
  5. VT circuit continuity checks.
  6. Check for any loose wirings.
  7. Any other additional inspections and tests as recommended by the manufacturer.