TA的每日心情 | 开心 2017-2-26 11:53 |
---|
签到天数: 7 天 连续签到: 1 天 [LV.3]偶尔看看II 累计签到:7 天 连续签到:1 天
|
发表于 2011-12-6 14:53:57
|
显示全部楼层
95页,Islanding 这一章就有讲到。! _7 Z2 a7 R# O- N1 c' M
To prevent islanding, a DR unit operating in parallel with the Area EPS should disconnect from the
: w$ Y& {: y3 q% A; K0 P4 Wsystem within 2 seconds of sensing a voltage sag or discontinuity of service on Area EPS side of the PCC.6 Y+ h( w) T, }8 u
This is typically fast enough to allow disconnection prior to the shortest reclosing times found in
+ ?9 u4 v7 _4 w. R! g3 ]protective relays on the Area EPS. It should also prevent reclosure into an out of phase DR unit, as well! n* C! T9 B ]
as allow the fault arc to deionize prior to reclosure. Once a DR unit has disconnected from the Area EPS,
8 N5 w, k) N* m# N# U) D& lit should not reconnect into a de-energized system |
|