jghrist: One already failed, the reason we started looking at their replacement. Also, since one has failed, is that valid reason to look at replacing them all? Your thoughts?
Zogzog: I understood corona inspections were ultrasound based and at lower voltages, corona is that much more difficult...
Actually, we have replacement insulators already, but we're looking to postpone replacement until early next year. Trying to determine if postponing the replacement is an 'acceptable risk'.
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...
