6.9kV Overhead Line Insulator Test Methods
6.9kV Overhead Line Insulator Test Methods
(OP)
Hi,
Looking for test methods to determine integrity of porcelain/ceramic insulators on a 6.9kV overhead line - without de-energizing the line. I've looked at both thermography and ultrasound, but understand their results may vary, especially at 6.9kV. Anyone have experience with either of these tests at 6.9kV? I also didn't see anything in ANSI C29.1-1988 (R2002) Test Methods for Electrical Power Insulators. Other than de-energizing the line and performing a ring test, is there anything more scientific? Last resort would be to perform a visual with binoculars, but again not really the most scientific...
Thanks,
Devin
Looking for test methods to determine integrity of porcelain/ceramic insulators on a 6.9kV overhead line - without de-energizing the line. I've looked at both thermography and ultrasound, but understand their results may vary, especially at 6.9kV. Anyone have experience with either of these tests at 6.9kV? I also didn't see anything in ANSI C29.1-1988 (R2002) Test Methods for Electrical Power Insulators. Other than de-energizing the line and performing a ring test, is there anything more scientific? Last resort would be to perform a visual with binoculars, but again not really the most scientific...
Thanks,
Devin






RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
Zogzog: I understood corona inspections were ultrasound based and at lower voltages, corona is that much more difficult to detect. Have you experience with corona detection at 6.9kV? I'll certainly look into it if it'll work.
I'm beginning to think that line insulators at 6.9kV give little or no indication of imminent failure.
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
Corona imaging is very effective at higher voltages, how low of a voltage it is effective is debatable for sure. 6.9kV is in that grey area, while we have seen corona in switchgear at 4160V, I can't say it is 100% accurate less than 15kV.
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
Wait for shutdown & do a visual inspection if you are still unhappy,
but I do not think you should be concerned.
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
RE: 6.9kV Overhead Line Insulator Test Methods
If you have some in question it would be a good job for an apprentice to learn to change them out hot.