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General tests on high voltage equipment

Short answer

High-voltage equipment undergoes sustained power-frequency tests (1 min, dry/wet), DC tests, high-frequency tests, and impulse tests (lightning 1.2/50 μs, switching 250/2500 μs). Non-destructive checks include insulation resistance, tan δ, capacitance, and partial discharge measurement.

What are the general tests that are carried out on high voltage equipment?

Tests on high voltage equipment prove that its insulation withstands the voltages it will meet in service. The general tests are:

  1. Sustained power-frequency tests – 50 Hz withstand and flashover tests, dry and wet, usually for 1 minute.
  2. High-voltage DC tests – for cables, capacitors and machines, with leakage current measurement.
  3. High-frequency tests – for insulators exposed to high-frequency (carrier, transient) voltages.
  4. Impulse (surge) tests – lightning impulse 1.2/50 μs, switching impulse 250/2500 μs and chopped waves, to verify BIL.

By purpose they are done as type tests (one unit of a design), routine tests (every unit) and acceptance/sample tests, supported by non-destructive checks such as insulation resistance, tan⁡δ\tan\delta and partial discharge measurement.

✓ Answer checked by Claude Opus 5.5 (high effort)

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