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Power Plant Thermography-Wide Range of Applications

From Flir Systems Incorporated
 

 
A Midwest nuclear power plant utilizes 345 kV oil circuit breakers (OCBs) rated at 2,000 amps with an interrupting capacity of 63,000 amps. OCBs are independent-pole, pneumatically operated breakers: air to close; spring to open. A hot spot was identified on the test tap cover of the A phase, on bus 10 side of OCB 10-11. The hot spot exhibited a difference in temperature (?T) of 12°F when compared with B and C phase tap covers on the same OCB. This is considered a non-line-of-sight component. It was determined through discussion with experts from the transmission department that if the source of the heat was behind the cover, it could be a serious problem. Per the Thermography Procedure, the condition was considered "red" with Action 3 Criteria requiring immediate planning and corrective action. PdM personnel increased frequency of monitoring to daily. Visual inspection indicated a slight oil leak near the bottom of the cover. PdM personnel and transmission experts created the following scenario
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Topics of Interest
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