IEEE Std. C37.102-2006 tripping 63T same as 87T
IEEE Std. C37.102-2006 tripping 63T same as 87T
(OP)
4.9.2.2 Tripping modes
Both the unit transformer and the UAT fault pressure relays should be connected to lockout relays that are separate from the lockout relays connected to the differentials. In some system configurations, these lockout relays trip the main generator and field and/or exciter breakers, trip the prime mover, and transfer the unit auxiliaries. However, if the UAT has a breaker to isolate it from the generator bus, then that breaker may be tripped and the unit auxiliaries transferred without affecting the generator or field and exciter breakers or tripping the prime mover. See the cautionary advice in 4.5.1.4.
Why lockout relays of 63T are separate from the lockout relays of 87T ?
Both the unit transformer and the UAT fault pressure relays should be connected to lockout relays that are separate from the lockout relays connected to the differentials. In some system configurations, these lockout relays trip the main generator and field and/or exciter breakers, trip the prime mover, and transfer the unit auxiliaries. However, if the UAT has a breaker to isolate it from the generator bus, then that breaker may be tripped and the unit auxiliaries transferred without affecting the generator or field and exciter breakers or tripping the prime mover. See the cautionary advice in 4.5.1.4.
Why lockout relays of 63T are separate from the lockout relays of 87T ?






RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
By Std lockout relay make both actions: tripping and blocking
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
So what are the benefits to us? - We may wrap the primary or secondary lines or both in the 87T zone (not all the time) and 87T fault can be very different from a rapid pressure.
Also these things tend to occur like 1-2AM, so we would get a call from a non electrical operations person..'hey the '86-63' tripped' etc... But, I'm a rookie....
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
...Also these things trend to Occur like 1-2AM, so we would get a call from a non electrical person operations .. 'hey the '86-63' tripped 'etc ...
I think the latter reason the most convincing!
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
Rather than a separate lockout, our sudden pressure relays hit a Qualitrol 909 seal-in relay to provide the targeting Madman correctly points out is very important.
If the desire for redundancy is high enough to justify dual lockouts, then it could be worth considering dual sudden pressure relays as well. We do not use redundant paths for pressure relays, however for microprocessor relays we usually dual trip as jghrist described.
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
refers to Figure 7-1a—Unit generator-transformer configuration AND Figure 7-1b—Unit generator-transformer configuration dc tripping logic
Why in Figure 7-1.b 87T trips 86T1 and 63 trips 86T2 , both with same goals?
For me, the only explanation is suggested by Madman4q.
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
The c37.102 introduction states:
The protection philosophy, practices, and limits are essentially identical [with a multi-functional microprocessor based protection system] to those of the implementation using discrete component relays.
Given this starting point, I can see why the newest version has the same diagram as the 1995 version. My philosophy regarding redundancy and the practice of cross tripping of dual trip coils has evolved significantly with the advent of microprocessor based relays. Perhaps the 2018 revision will include guidance on using multiple output contacts from digital relays.
RE: IEEE Std. C37.102-2006 tripping 63T same as 87T
86T1, 86T2 , 86T3 tripping same circuit breakers and shutdown same prime move.
86T1 by electrical system maintenance team.
86T2 by non electrical maintenance team
86T3 by elctrical power house maintenance team.