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Dry power-frequency flashover voltage test for insulator

Dry power-frequency flashover voltage test for insulator is very important, this article mainly talk about which tests shall be done?

Dry power-frequency flashover voltage test

Dry power-frequency flashover voltage test

Dry power-frequency flashover voltage tests include
1) Initial dry power-frequency flashover voltage test
2) Sudden load release test (30% of SML* -20 to -25°C)
3) Temperature-mechanical test (50% of SML* +50 to -35°C)
4) Water-immersion test (42 hr, boiling water, NaCl0.1% weight)
5) Verification tests
  a) Visual inspection (for cracking or other abnormality)
  b) Steep-front impulse voltage test
  c) Dry power-frequency voltage tests
    ◆ Flashover test (to check for drop from initial conditions)
    ◆ 80% of FOV for 30 min (to check for temperature rise in insulator shank)
* SML = specific mechanical load

The following test results were obtained:
a) Visual inspection: no cracking or separation of the housing rubber was observed.
b) Steep-front impulse voltage test: The insulators tested were separated into two sections and 1000 kV/ ms (positive- and negative-polarity) were applied 25 times to each. All underwent external flashover, but no puncture of the housing rubber or core occurred.
c) Dry power-frequency voltage tests: the results of five repetitions of average flashover voltage, but all of the test specimens held 90% or more of initial flashover voltage. Next 80% of average initial flashover voltage (328.9 kV x 0.8 = 263 kV) was applied to the lower end-fitting for 30 min and the temperature rise was measured immediately. All test specimens satisfied the standards, with a temperature rise of less than 20 K.


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