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(3) Service life of capacitor
Opening and closing of the capacitor produces sever conditions for contactors,
such as high frequency inrush current and interpole recovery voltage more than
twice the normal voltage.
The criteria of the maximum number of the capacitor current switching operations
is shown in the graph below. The vacuum interrupter should be replaced when the
number of switching operations in the graph is reached.
１０
５
４
３
２
１
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２０
５０
１００
ｓｗｉｔｃｈｉｎｇ ｃｕｒｒｅｎｔ（Ａ）
Fig.9
Capacitor switching life
(with 6% reactor)
-
２１ -
２００ ３００ ４００
6F9G0154
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