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。
9 u* X5 k+ Q& _% q7 W+ oTo prevent islanding, a DR unit operating in parallel with the Area EPS should disconnect from the" W3 [! @3 b( l, c( j) Y
system within 2 seconds of sensing a voltage sag or discontinuity of service on Area EPS side of the PCC." q, e' s2 t9 D( p6 m
This is typically fast enough to allow disconnection prior to the shortest reclosing times found in) s D* ^5 E5 r: B$ z+ t6 {9 s" R
protective relays on the Area EPS. It should also prevent reclosure into an out of phase DR unit, as well
7 s3 J% Y7 I9 _! T2 }as allow the fault arc to deionize prior to reclosure. Once a DR unit has disconnected from the Area EPS,
- b9 |* g' a! B: h% u# O, i; Mit should not reconnect into a de-energized system |
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