Dielectric withstand voltage tests should be performed by users of switchgear devices to prove the ability of insulating materials and spacings to withstand specified over-voltages for specified times without dielectric breakdown or puncture.

 

The test voltage levels in field tests are typically 75 or 80 % of the levels used on new equipment by the suppliers. Such tests should be conducted as:

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- Commissioning tests before new equipment is placed into service

- Test before recently maintained equipment is returned to service

- In general, as part of a comprehensive preventive maintenance program.

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Checking integrity of:

-Vacuum interrupters

- Busbar

- Switchgear

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