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tricard
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Post subject: Lock-out relays  Posted: Fri Dec 04, 2009 2:24 pm |
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Joined: Thu Apr 02, 2009 5:59 am
Posts: 6
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Hi everyone,
I am doing an arc flash study for a generating station that protects the main generator buses through lockout relays (i.e. 50/51/87 etc. element actuates the 86 element which in turn initiates the circuit breaker trip coil). It turns out there is a wide variance of activation times on these lockout relays (from reading on-line specs) and it is not particularly easy to get this data from the client. How does everyone incorporate the 86 element time into their model? I have heard times ranging from 130ms all the way down to 8ms... makes a pretty big difference in HRC.
Thanks in advance for the input.
Tim Ricard
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stevenal
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Post subject: Posted: Fri Dec 18, 2009 11:21 am |
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Joined: Tue Jan 13, 2009 5:00 pm
Posts: 631
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Electroswitch says .5 cycle.
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