Overcurrent static relay

Claim 1

A CONTROL SYSTEM RESPONSIVE TO CURRENT IN A POLYPHASE ELECTRICAL CIRCUIT TO PRODUCE A SIGNAL, SAID CONTROL SYSTEM COMPRISING: CURRENT TRANSFORMERS EACH HAVING ITS PRIMARY WINDING CONNECTED TO A DIFFERENT PHASE AND HAVING THE OUTPUTS FROM ITS SECONDARY WINDINGS CONNECTED IN SERIES TO PRODUCE AN OUTPUT VARYING AS A FUNCTION OF THE HIGHEST CURRENT OF ANY PHASE; STORAGE MEANS CONNECTED TO RECEIVE THE OUTPUT FOR STORING ENERGY FROM THE OUTPUT AS A VOLTAGE; A BYPASS CIRCUIT CONNECTED PARALLEL TO THE STORAGE MEANS; A POTENTIOMETER CONNECTED TO ADJUST THE PORTION OF THE INPUT PASSED TO THE STORAGE MEANS RELATIVE TO THE PORTION OF THE INPUT PASSED TO THE BYPASS CIRCUIT; SAID BYPASS CIRCUIT COMPRISING THE EMITTER-COLLECTOR CIRCUIT OF A TRANSISTOR; AN EMITTER-FOLLOWER AMPLIFIER CONNECTED TO MAINTAIN THE POTENTIAL ACCROSS THE BYPASS CIRCUIT EQUAL TO THE POTENTIAL ACROSS THE STORAGE MEANS, SAID TRANSISTOR AND COMPONENTS SELECTED WHEREBY THE IMPEDANCE IN THE BYPASS CIRCUIT IS MAINTAINED EQUAL TO THE IMPEDANCE ACROSS THE STORAGE MEANS; A SILICON CONTROLLED RECTIFIER CONNECTED TO CONTROL THE SWITCHING CIRCUIT; A ZENER DIODE CONNECTED IN SERIES WITH THE GATING TERMINAL OF THE SILICON CONTROLLED RECTIFIER AND CONNECTED IN PARALLEL WITH THE STORAGE MEANS TO TURN ON THE SILICON CONTROLLED RECTIFIER WHEN THE VOLTAGE ACROSS THE STORAGE MEANS EXCEEDS A PREDETERMINED LEVEL; A TRANSISTOR CONNECTED TO RECEIVE A FUNCTION OF THE OUTPUT AND HAVING ITS EMITTER-COLLECTOR CIRCUIT IN PARALLEL WITH THE STORAGE MEANS, SAID TRANSISTOR BIASED AND CONTROLLED TO REMAIN IN A CONDUCTIVE STATE WHEN THE OUTPUT IS BELOW A PREDETERMINED LEVEL AND TO ASSUME A NONCONDUCTIVE STATE WHEN THE OUTPUT IS ABOVE A PREDETERMINED LEVEL; A CIRCUIT CONNECTED IN SERIES WITH THE CURRENT GENERATING MEANS, SAID LAST CIRCUIT COMPRISING A ZENER DIODE CONNECTED IN PARALLEL WITH A VARIABLE RESISTANCE AND IN SERIES WITH A VARIABLE RESISTANCE.