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    • 1. 发明公开
    • Circuit breakers test device
    • 用于剩余电流断路器的测试设备
    • EP1591797A1
    • 2005-11-02
    • EP04252469.4
    • 2004-04-28
    • Megger Limited
    • Haynes, Simon Michael
    • G01R31/327
    • G01R31/3277G01R31/3272
    • According to the invention there is provided a device for testing an electric circuit, the electric circuit including a magnetic core (28) comprising means to generate an AC preconditioning signal with decaying amplitude;

      means to apply the AC preconditioning signal to the magnetic element;
      means to generate a test signal; and means to apply a test signal to the electric circuit, wherein the device is adapted to apply the test signal subsequent to the preconditioning signal.

      The device may be a residual current circuit breaker (RCCB) trip time test instrument. Typically, RCCBs include a transformer core (20) onto which live (L) and neutral windings (N) are placed. Previous circuit activity can leave the transformer core (20) magnetised, even after the live and neutral currents have returned to an equal condition. This can affect subsequent tests. The device of the present invention applies a pre-conditioning decaying AC signal to the transformer core (20) in order to bring the residual magnetism to within a specified, acceptable level.