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Arrester disconnecting device

  • US 4,864,455 A
  • Filed: 12/08/1988
  • Issued: 09/05/1989
  • Est. Priority Date: 02/16/1988
  • Status: Expired due to Fees
First Claim
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1. A surge arrester disconnecting device having a reactor, a fusible wire connected in series with said reactor and an air gap provided in parallel to a series circuit of said reactor and said fusible wire and adapted to disconnect a surge arrester connected in series with a parallel circuit of said gap and said series circuit from an electric circuit connecting said arrester to a utilization means, when fault current flows through said arrester, by melt down of said fusible wire, comprising a fixed electrode, a movable electrode, said air gap having a predetermined size and being provided between said fixed electrode and said movable electrode, latch means having one end portion engaged normally with said movable electrode, trigger means engaged normally with the other end portion of said latch means to hold a normal engagement of said one end portion thereof with said movable electrode, said fusible wire being stretched between said movable electrode and said trigger means, first spring means for biasing said trigger means toward a position at which said normal engagement of said one end portion thereof with said movable electrode is broken, said first spring means having a spring force compatible with a tension of said fusible wire, and second spring means normally kept compressed by said movable electrode latched by said latch means to push said movable electrode in a direction in which said movable electrode is separated from said fixed electrode when said movable electrode is unlatched, whereby, when said fusible wire is melted down, said trigger means is actuated by said first spring means to unlatch said movable electrode to allow said second spring means to push said movable electrode in said direction.

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