TA的每日心情 | 开心 2017-2-26 11:53 |
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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。: J$ s4 D# I# t1 S- j% R
To prevent islanding, a DR unit operating in parallel with the Area EPS should disconnect from the% k9 Q5 L m9 L( n4 j7 w
system within 2 seconds of sensing a voltage sag or discontinuity of service on Area EPS side of the PCC.' {% [) z+ M0 m9 m' C
This is typically fast enough to allow disconnection prior to the shortest reclosing times found in
- I- |7 \/ o: [. yprotective relays on the Area EPS. It should also prevent reclosure into an out of phase DR unit, as well. S0 z, t9 A$ j/ C: z+ X7 _! V
as allow the fault arc to deionize prior to reclosure. Once a DR unit has disconnected from the Area EPS,8 V N: q" ]3 N: b+ {; }# f
it should not reconnect into a de-energized system |
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