| 摘要 |
PURPOSE:To enable performance tests to be conducted by a simple instrument by connecting a current source supplying the current to a lightening arrestor disconnecting device and a voltage source supplying the voltage to the disconnecting device in parallel with the disconnecting device. CONSTITUTION:When starting the measurement of the lightening arrestor disconnecting device ST, an ON/OFF switch S1 and an interrupter SH2 for a voltage source are opened, whereas an interrupter SH1 for a current source is opened. In this state, a generator Gen is excited so that prescribed voltage and current are impressed to the disconnecting device ST. When the ON/OFF switch S1 is turned on, the current (i) flows through the disconnecting device ST and the current value is adjusted by a reactor L to a prescribed value. After the lapse of a prescribed time, this current is interrupted by the power source interrupter SH1. After the lapse of a further prescribed time, the power source interrupter SH2 is turned on. In this manner, the prescribed voltage Vt is impressed to the disconnecting device ST and the dielectric strength performance of the device ST after the current supply to the device ST is checked.
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