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Wet withstand voltage test for composite pin insulator

You may feel boring when watch a power frequency wet withstand voltage test for composite pin insulator, since you can't see anything special, no flashover, no excitement, just a composite insulator under the rain. But Power frequency wet withstand voltage test for composite pin insulator is very a important test to check insulator quality.

Voltage application of power frequency wet withstand voltage test for composite pin insulator:
75% of the rated wet withstand voltage maybe applied in one step and gradually raised to the required value in not less than 5 nor more than 30 seconds.

Test voltage and time of power frequency wet withstand voltage test for composite pin insulator:
The test voltage, which is the rated wet withstand voltage, with appropriate atmospheric corrections applied, shall be held on the test specimen for 10 seconds.

corrections of power frequency wet withstand voltage test for composite pin insulator:
Correction of composite insulators test shall be in accordance with international standard, except that no correction shall be made for humidity. the test voltage applicable to existing atmospheric conditions is obtained from the rated withstand voltage.

After the withstand test, if you increase the applied voltage, a composite insulator low frequency wet flashover voltage test is done. These two tests can be done at a same test procedure.

 

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