Q:-How to test insulators?
Must read & share to all electrical & electronics engineer's...
Ans:-Always remember to practice safety procedures for the flash-over voltage distance and use a sturdy enclosure to contain an insulator that may shatter, due to steam build-up from moisture in a cavity, arcing produces intense heat, an AM radio is a good RFI/arcing detection device, a bucket truck AC dielectric test set (130KV) is a good test set for most pin and cap type insulators.
A recent article said the DC voltage required to “search out defects can be 1.9 times the AC voltage.
*.Insulators have a normal operating voltage and a flash-over voltage. Insulators can have internal flash-over that are/are not present at normal operating voltage. If the RFI is present, de-energize the insulator (line) and if the RFI goes away, suspect the insulator (line).
Then there can be insulators that have arcing start when capacitor or other transients happen, stop when the line is de-energized or dropped below 50% of arc ignition voltage.
Using a meg-ohm-meter can eliminate defective insulators that will immediately arc-over tripping the test set current overload.
From ur's # sai saikumar jn
( Bellapuri saikumar )
Must read & share to all electrical & electronics engineer's...
Ans:-Always remember to practice safety procedures for the flash-over voltage distance and use a sturdy enclosure to contain an insulator that may shatter, due to steam build-up from moisture in a cavity, arcing produces intense heat, an AM radio is a good RFI/arcing detection device, a bucket truck AC dielectric test set (130KV) is a good test set for most pin and cap type insulators.
A recent article said the DC voltage required to “search out defects can be 1.9 times the AC voltage.
*.Insulators have a normal operating voltage and a flash-over voltage. Insulators can have internal flash-over that are/are not present at normal operating voltage. If the RFI is present, de-energize the insulator (line) and if the RFI goes away, suspect the insulator (line).
Then there can be insulators that have arcing start when capacitor or other transients happen, stop when the line is de-energized or dropped below 50% of arc ignition voltage.
Using a meg-ohm-meter can eliminate defective insulators that will immediately arc-over tripping the test set current overload.
From ur's # sai saikumar jn
( Bellapuri saikumar )
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