Keywords:Shunt reactor, switching, restrike, SF6, overvoltages
Summary:
At EHV level shunt reactors are applied to regulate the reactive power balance of a system by means of compensating for the surplus reactive power generation of transmission lines. Reactors are normally disconnected at heavy load and are connected to the lines at periods of low load. Consequently, frequent switching is a significant characteristics of reactors. The main insulation of reactors can be overstressed if the breaker has high current chopping character. Furthermore, if a conventional arrester operates as a consequence of current chopping, or a restrike occurs during the switching-off operation, the turn-to-turn insulation of the reactor can also be jeopardized by the steep voltage change. In this case-study a comprehensive and a simplified EMTP model of the reactor are introduced. The computer model has been validated in field experiments.
The one-line diagram of the 750 kV reactors were investigated in
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