| Arc Flash Forum https://brainfiller.com/arcflashforum/ |
|
| Lock-out relays https://brainfiller.com/arcflashforum/viewtopic.php?f=23&t=829 |
Page 1 of 1 |
| Author: | tricard [ Fri Dec 04, 2009 2:24 pm ] |
| Post subject: | Lock-out relays |
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 |
|
| Author: | stevenal [ Fri Dec 18, 2009 11:21 am ] |
| Post subject: | |
Electroswitch says .5 cycle. |
|
| Page 1 of 1 | All times are UTC - 7 hours |
| Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |
|