220kv Lightening Arrestor testing
220kv Lightening Arrestor testing
(OP)
Dear all
220kv Lightening Arrestor
what type of site tests are preferred during Operation and Maintenance of 220 kv Lightening Arrestor?
Can the following are helpful
1.Third hormic current measurement (online test)
2.Insulation resistance meansrement. If yes separate top stack and bottom stack and total LA. (Offline test)
Please give any site for furthur site test.
What is minium IR value of the LA preferred to discard the LA?
220kv Lightening Arrestor
what type of site tests are preferred during Operation and Maintenance of 220 kv Lightening Arrestor?
Can the following are helpful
1.Third hormic current measurement (online test)
2.Insulation resistance meansrement. If yes separate top stack and bottom stack and total LA. (Offline test)
Please give any site for furthur site test.
What is minium IR value of the LA preferred to discard the LA?






RE: 220kv Lightening Arrestor testing
This is an off-line test. Individual elements are tested separately and the results compared with historical data from previous tests or with like items.
old field guy
RE: 220kv Lightening Arrestor testing
Thank you for the suggested test.
Could you please tell me few service providers names. Or Name of testing equipment and suppliers.
regards
RE: 220kv Lightening Arrestor testing
ht
for a testing company in your area, assuming you're in the US.
The equipment is available for rental or purchase, but the testing is a somewhat specialized function.
If you're outside the US, I'm sure that there are companies with similar capabilities.
I neglected to say that an infra-red thermography of the arrestors in question is also not a bad approach. WE have detected some arrestors with significant temperature differences from adjacent units, and these were replaced. They also showed poor results on the subsequent power factor testing.
old field guy
RE: 220kv Lightening Arrestor testing
There are available today surge arrester monitoring system that may continually or periodically check the status or degradation of the unit
The most popular arrester field testing are:
1. Power Factor /watt loss test.
2. Infrared analysis.
3. Resistive leakage current.
Impulse test may be impractical since require onsite impulse generator.
RE: 220kv Lightening Arrestor testing
Thank you for suggested testing.
We are having 33nos. 220kv Lightening arrestors. these are in service for 10 years onwards. Suddenly within 2 months span one after another transmission Line Lightening arrestors failed.
Generally every year we do IR value testing and we observed always more than 5000 Mega ohms values. Recently the following insulation resistance values found for one of the arrestor.
Voltage : 5000 vdc, Meggar make Insulation tester.
Top stack - 80 Megaohms
Bottom stack - 6000 Megaohms
Total stack - 5500 Megaohms
Can this LA (Lightening Arrestor) needs any tests/replacement?
Could you please suggest any thing.
Thanking you
RE: 220kv Lightening Arrestor testing
RE: 220kv Lightening Arrestor testing
RE: 220kv Lightening Arrestor testing
RE: 220kv Lightening Arrestor testing
Before this IR value measurement we performed the on -line resistive leakeage current moitoring test. we was not find any clue.
Regards
RE: 220kv Lightening Arrestor testing