摘要 |
PURPOSE: A device of judging leakage voltage and gate control function is provided to protect an equipment and improve a reliability, by previously judging the badness without separating a thyrister from electron and electric equipments. CONSTITUTION: When an alternating current voltage is applied to one terminal, a high voltage is generated from a high voltage generating transformer and an alternating current high voltage is applied between an anode(A) and a cathode(K). A current is limited through a current limiting resistor(R1), and a thyrister(SCR1) measures a leakage voltage into a leakage direct current voltage meter(M1) through a thyrister(SCR1), a diode(D1) and a switch(SW1). If the leakage voltage is over a limited value, the switch(SW1) for measuring the leakage voltage is set to a neutral position. Switches(SW2,SW3) are switched on and a volume(VR1) for controlling a pulse phase is slowly increased. A gate pulse signal of a thyrister is increased so as to be turned on.
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