Power line failure detection system

Claim 1

IN COMBINATION, (A) A THREE-PHASE TRANSFORMER HAVING A WYE-CONNECTED PRIMARY, A SECONDARY, AND A COMMON CORE FOR THE WINDINGS OF SAID PRIMARY AND SECONDARY, (B) A THREE-PHASE POWER LINE SUPPLYING POWER TO SAID PRIMARY, AND AN ALTERNATE THREE-PHASE SOURCE OF POWER, (C) AN ELECTRIC CIRCUIT CONNECTING SAID SECONDARY TO A LOAD, (D) AN ELECTRIC CIRCUIT CONNECTING SAID ALTERNATE SOURCE TO SAID LOAD, (E) A TRANSFER SWITCH ASSEMBLY COMPRISING A COIL, A FIRST SWITCH IN CIRCUIT (C), AND A SECOND SWITCH IN CIRCUIT (D), SAID FIRST SWITCH BEING CLOSED AND SAID SECOND SWITCH OPEN WHEN SAID COIL IS ENERGIZED, (F) AN AUXILIARY TRANSFORMER ASSOCIATED WITH EACH PHASE CONDUCTOR OF SAID POWER LINE, SAID CONDUCTOR SERVING AS THE PRIMARY OF SAID AUXILIARY TRANSFORMER, AND AN AUXILIARY SECONDARY FORMING PART OF SAID AUXILIARY TRANSFORMER, (G) A RELAY HAVING A COIL AND A PAIR OF NORMALLY OPEN CONTACTS, A CIRCUIT CONNECTED SAID RELAY COIL TO SAID AUXILIARY SECONDARY, AND MEANS IN SAID CIRCUIT RESPONSIVE TO THE PRESENCE OF AT LEAST EXECITING CURRENT IN SAID CONDUCTOR FOR ENERGIZING SAID RELAY COIL TO CLOSE SAID CONTACTS, SAID RELAY COIL BEING DEENERGIZED AND SAID CONTACTS OPENED THE CURRENT IN THE CONDUCTOR FALLS BELOW THE EXCITING CURRENT, (H) A CIRCUIT INCLUDING SAID TRANSFER SWITCH COIL AND SAID THREE PAIRS OF RELAY CONTACTS IN SERIES, (I) WHEREBY UPON THE FAILURE OF ANY PHASE OF SAID POWER LINE, THE RELAY CONTACTS ASSOCIATED WITH THAT PHSE CONDUCTOR WILL OPEN AND CAUSE SAID TRANSFER SWITCH TO CONNECT SAID LOAD FROM SAID TRANSFORMER SECONRDARY AND CONNECT SAID LOAD TO SAID AUXILIARY SOURCE OF POWDER.