Directional relay apparatus

Claim 1

IN A RELAYING SYSTEM FOR A THREE PHASE NETWORK, A FIRST PLURALITY OF INPUT TERMINALS SUPPLYING A THREE PHASE ELECTRICAL QUANTITY WHICH IS PROPORTIONAL TO THE POTENTIAL OF A THREE PHASE NETWORK FROM WHICH SAID FIRST TERMINALS ARE ENERGIZED, A SECOND PULRALITY OF INPUT TERMINALS SUPPLYING A THREE PHASE ELECTRICAL QUANTITY WHICH IS PROPORTIONAL TO THE CURRENT FLOWING IN A THREE PHASE NETWORK FROM WHICH SAID SECOND TERMINALS ARE ENERGIZED, FIRST AND SECOND AND THIRD PAIRS OF OUTPUT TERMINALS, FIRST AND SECOND COMPENSATORS, EACH SAID COMPENSATOR INCLUDING INPUT MEANS AND OUTPUT MEANS AND EFFECTIVE TO ENERGIZE ITS SAID OUTPUT MEANS WITH A COMPENSATING VECTOR QUANTITY WHICH IS THE VECTOR SUM OF ELECTRICAL QUANTITIES SUPPLIED TO ITS SAID INPUT MEANS, EACH SAID COMPENSATOR FURTHER INCLUDING MEANS TO SHIFT THE PHASE OF ITS SAID COMPENSATING VECTOR QUANTITY WITH RESPECT TO SAID VECTOR SUM OF SAID ELECTRICAL QUANTITIES SUPPLIED THERETO, FIRST CIRCUIT MEANS CONNECTING A FIRST PAIR OF SAID FIRST INPUT TERMINALS TO SAID FIRST PAIR OF OUTPUT TERMINALS AND INCLUDING SAID OUTPUT MEANS OF SAID FIRST COMPENSATOR WHEREBY SAID FIRST PAIR OF OUTPUT TERMINALS IS ENERGIZED BY THE VECTOR SUM OF THE SAID QUANTITIES WHICH ARE SUPPLIED TO SAID FIRST CIRCUIT MEANS BY SAID FIRST PAIR OF INPUT TERMINALS AND SAID FIRST COMPENSATOR, A SECOND CIRCUIT MEANS CONNECTING A SECOND PAIR OF SAID FIRST INPUT TERMINALS TO SAID SECOND PAIR OF OUTPUT TERMINALS AND INCLUDING SAID OUTPUT MEANS OF SAID SECOND COMPENSATOR WHEREBY SAID SECOND PAIR OF OUTPUT TERMINALS ARE ENERGIZED BY THE VECTOR SUM OF THE SAID QUANTITIES WHICH ARE SUPPLIED TO SAID SECOND CIRCUIT MEANS BY SAID SECOND PAIR OF INPUT TERMINALS AND SAID SECOND COMPENSATOR, A PHASE SHIFTING CIRCUIT, A THIRD CIRCUIT MEANS CONNECTING SAID FIRST PAIR OF INPUT TERMINALS TO SAID THIRD PAIR OF OUTPUT TERMINALS AND INCLUDING SAID PHASE SHIFTING CIRCUIT WHEREBY THE PHASE OF THE SAID QUANTITY WHICH IS SUPPLIED TO SAID THIRD PAIR OF OUTPUT TERMINALS MAY BE PHASE SHIFTED WITH RESPECT TO THE PHASE OF THE SAID QUANTITY SUPPLIED TO SAID THIRD CIRCUIT MEANS FROM SAID FIRST PAIR OF INPUT TERMINALS, MEANS CONNECTING SAID INPUT MEANS OF SAID FIRST COMPENSATOR TO A FIRST GROUP OF TERMINALS OF SAID SECOND PLURALITY OF TERMINALS TO SUPPLY A FIRST CURRENT COMPENSATING QUANTITY TO SAID FIRST COMPENSATOR WHICH IS REPRESNTATIVE OF THE DIFFERENCE BETWEEN A FIRST PHASE QUANTITY AND A SECOND PHASE QUANTITY OF SAID THREE PHASE QUANTITY SUPPLIED BY SAID SECOND PLURALITY OF INPUT TERMINALS, MEANS CONNECTING SAID INPUT MEANS OF SAID SECOND COMPENSATOR TO A SECOND GROUP OF TERMINALS OF SAID SECOND PLURALITY OF TERMINALS TO SUPPLY A SECOND CURRENT COMPENSATING QUANTITY TO SAID SECOND COMPENSATOR WHICH IS REPRESENTATIVE OF THE DIFFERENCE BETWEEN TWO PHASE QUANTITIES OF SAID THREE PHASE QUANTITY SUPPLIED BY SAID SECOND PLURALITY OF INPUT TERMINALS, AND A PHASE SENSITIVE CONTROL CIRCUIT CONNECTED TO SAID PAIRS OF OUTPUT TERMINALS AND EFFECTIVE WHEN THE PAHSE OF SAID QUANTITY OF A PREDETERMINED PAIR OF SAID OUTPUT TERMINALS IS LEADING IN PHASE RELATIONSHIP WITH THE PHASE OF EITHER OF SAID QUANTITIES OF THE OTHER TWO OF SAID PARIS OF SAID OUTPUT TERMINALS.