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。
; n" K ]% n- D# _To prevent islanding, a DR unit operating in parallel with the Area EPS should disconnect from the' ]& N4 [& E2 |: f3 T
system within 2 seconds of sensing a voltage sag or discontinuity of service on Area EPS side of the PCC.
, `3 f3 }% w5 o, } a5 XThis is typically fast enough to allow disconnection prior to the shortest reclosing times found in2 ^3 r" L7 Q) ^& d7 l, D
protective relays on the Area EPS. It should also prevent reclosure into an out of phase DR unit, as well
( N4 p! p$ I- D' sas allow the fault arc to deionize prior to reclosure. Once a DR unit has disconnected from the Area EPS,. R: V2 w: c* r( G: I i
it should not reconnect into a de-energized system |
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