Electrical discharge simulator for insulation testing including relay means connected across series capacitors

Claim 1

A DISCHARGE SIMULATOR FOR INSULATION TESTING PURPOSES COMPRISING: A PAIR OF TERMINALS AFFORDING CONNECTION ACROSS INSULATION TO BE TESTED; A PAIR OF SERIES CONNECTED CAPACITOR MEANS CONNECTED ACROSS SAID TERMINALS TO BE CHARGED BY AN A.C. POTENTIAL APPLIED TO THE INSULATION UNDER TEST; AN ELECTROMAGNETIC RELAY OF THE TYPE HAVING NORMALLY OPEN CONTACTS WHICH ARE EFFECTIVELY FREE FROM BOUNCE AND WHICH PASS FROM THE NON-CONDUCTING TO THE CONDUCTING CONDITION IN LESS THEN 0.1 MICROSECOND; PHASE SHIFT MEANS CONNECTING THE WINDING OF SAID RELAY ACROSS SAID TERMINALS; MEANS FOR CONNECTING SAID CONTACT ACROSS ONE OF SAID CAPACITOR MEANS SO AS TO SHORT-CIRCUIT AND DISCHARGE SAID ONE CAPACITOR MEANS WHENEVER SAID RELAY IS ENERGIZED TO A PREDETERMINED VALUE OF SAID APPLIED A.C. POTENTIAL; AND MEANS CONNECTED ACROSS SAID TERMINALS FOR INDICATING THE VOLTAGE APPLIED THERETO.