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。
( E; z6 c( G; x, Q; FTo prevent islanding, a DR unit operating in parallel with the Area EPS should disconnect from the* i" {" {. A( x% l
system within 2 seconds of sensing a voltage sag or discontinuity of service on Area EPS side of the PCC., z) i! l5 R1 w& f
This is typically fast enough to allow disconnection prior to the shortest reclosing times found in% ^' R* u4 l$ R
protective relays on the Area EPS. It should also prevent reclosure into an out of phase DR unit, as well) I) {, `+ G8 f7 k
as allow the fault arc to deionize prior to reclosure. Once a DR unit has disconnected from the Area EPS,
. v5 {2 Z! }# J: i" m7 A8 uit should not reconnect into a de-energized system |
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