http://www.neonlightssigns.info/nos-condition/
Nos Condition
what are the causes of PT falure ( 11 KV /110 volt ) indoor type?
it is in power plant 15 MW running in parallel with grid through 132 kv/11 kv transformer .in last 6 years 5 time 6 nos of PT s failed.what are the condtion monitoring methods to know the condition of PT. BUT during the last three years the failure is one time ( it may due to some tuning in ternator AVR / less no of disturbance from grid )
.It could be form line transients but it sounds like you may have a protector (the AVR?) as long as the response time is fast enough.
You did not say what the load is on your PT (in VA) and the nature of the load. If there are high starting or inrush currents and you have frequent power drops, that could do it if the VA rating isn't high enough.
You really need to monitor the primary voltage (11 KV) over time to see if there is a correlation. But that means loosing at least one more PT. Sorry
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1999 GSXR 750 GOOD CONDITION 4000 ISH MILES! CHROME RIMS! STREET WARLOCKZ
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