TA的每日心情 | 开心 2017-2-26 11:53 |
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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
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发表于 2011-12-6 14:53:57
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95页,Islanding 这一章就有讲到。
0 f( K; t2 S; c' o! C/ ]& iTo prevent islanding, a DR unit operating in parallel with the Area EPS should disconnect from the# O; W7 Z5 [7 w1 w( \
system within 2 seconds of sensing a voltage sag or discontinuity of service on Area EPS side of the PCC.
& g5 J2 Y7 C# B) k! iThis is typically fast enough to allow disconnection prior to the shortest reclosing times found in
3 F* w2 t- p1 [9 v( T' G! w. {9 ~protective relays on the Area EPS. It should also prevent reclosure into an out of phase DR unit, as well
! E6 t9 U7 C& y: R: U- ~as allow the fault arc to deionize prior to reclosure. Once a DR unit has disconnected from the Area EPS,
1 U4 I! B) P: dit should not reconnect into a de-energized system |
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