3 thoughts
1) If your using 2 different manufacturers to supervise weak engineering, update your engineers.
2) We have never paid for a Schweitzer repair in 15yrs. They have warrantied everything so far...
3) Tech/engineering support for SEL relays is second to NONE!
Cheers
Chris
I think the Germans are going to import more French nuclear power and burn wood.
Scotty you're half correct "Never underestimte the stupidity of politicians"
Never underestimate the stupidity of the voting public.
What is your total N current as a % of full load?
If the units are paralleled to the grid they sould be fine running in PF mode.
What type of regulators? Is there a droop CT input?
Have you tried running your 600kw paralleled with the 2nd unit off?
Precisely why we commisson equipment, gathering baseline data with temp correction and himidity recordings. On well maintained equipment you typically don't see dramatic changes between EPM's. Always refer to the NETA standards for device testing & insulation resistance limits.
One more point on the In Phase Monitor type switches. If the gen freq is closely matched to the Normal source it may not drift into the sync window for minutes. I've seen them sit there for 20 minutes. I've instructed customers to check their gen (depending on the governor type) matching speed...
Did you have a quality NETA company commission your transformers? I have seen a few poor internal terminations cause heating of the bushing and subsequent oil seepage. Also some Noload LTC's with poor terminations cause heating as well. That typically shows up during the on-site commission testing.
2 questions 1) did you check the gen freq before the transfer test? 2) does the 800A breaker have a electronic trip unit?
If the gen freq is permissive (not driven into sync) this is going to be a on going problem. I've seen an ASCO CTS ATS In Phase Monitor allow a close with a very fast slip...
Did anyone record the max oil temp pointer? It should have been on the sample form. What is the replace xfmr temp running?
What does the load PQ signature look like? Harm heating? Just throwing it out there.
Yes, it's a great test. Verification of current circuits, wiring polarity and burden is doable with a test set. We do it all the time for commissioning. Secondary injection with all wiring terminated and the circuit dead. Nothing to do with saturation.
