Protective relaying assembly

Claim 1

IN A PROTECTIVE RELAY ASSEMBLY, A FIRST PAIR OF TERMINALS, A SECOND PAIR OF TERMINALS, MEANS FOR DERIVING FROM CURRENT SUPPLIED TO THE FIRST OF TERMINALS A FIRST DIRECT VOLTAGE HAVING A MAGNITUDE DEPENDENT ON THE MAGNITUDE OF CURRENT FLOWING THROUGH THE FIRST PAIR OF TERMINALS, MEANS FOR DERIVING FROM A VOLTAGE ACROSS SAID SECOND PAIR OF TERMINALS A SECOND DIRECT VOLTAGE HAVING A MAGNITUDE DEPENDENT ON THE MAGNITUDE OF THE VOLTAGE ACROSS THE SECOND PAIR OF TERMINALS, A CAPACITOR, CIRCUIT MEANS CONNECTING THE CAPACITOR FOR ENERGIZATION IN ACCORDANCE WITH THE FIRST DIRECT VOLTAGE, SAID CIRCUIT MEANS INCLUDING SUBSTANTIAL RESISTANCE WHEREBY THE CIRCUIT MEANS AND CAPACITOR PROVIDE A TIME-DELAY CIRCUIT, DISCHARGE MEANS RESPONSIVE TO A PREDETERMINED CHANGE IN CURRENT FLOWING THROUGH SAID FIRST PAIR OF TERMINALS FOR SUBSTANTIALLY DISCHARGING SAID CAPACITOR, AND TRANSLATING MEANS RESPONSIVE TO THE DIFFERENCE BETWEEN THE VOLTAGE ACROSS AND CAPACITOR AND THE SECOND DIRECT VOLTAGE, SAID DISCHARGE MEANS COMPRISING A TRANSFORMER HAVING A PRIMARY WINDING, MEANS FOR ENERGIZIN THE PRIMARY WINDING BY DIRECT CURRENT DEPENDENT ON CURRENT FLOWING THROUGH THE FIRST PAIR OF TERMINALS, AN ELECTRORESPONSIVE SWITCH OPERABLE FOR SHUNTING SAID CAPACITOR SAID TRANSFORMER HAVING A SECONDARY WINDING CONNECTED TO ENERGIZE THE ELECTRORESPONSIVE SWITCH FOR SHUNTING THE CAPACITOR IN RESPONSE TO AN INCREASE IN THE DIRECT CURRENT SUPPLIED TO SAID PRIMARY WINDING.