Prevent electrified cutting device of primary equipment of guarantor's debugging then of transformer substation

The utility model discloses a prevent electrified cutting device of primary equipment of guarantor's debugging then of transformer substation has solved the electrified problem of transformer substation relay protection debugging in -process primary equipment mistake. Constitute closed detection loop by detection circuitry microprocessor (20), voltage relay normally open contact (14) and detectioncircuitry power (19), put in series on the line between relay protection tester (9) and relay protection tester external power supply (29) current relay normally closed contact (26), establish ties circuit break power (28), current relay coil (25) and switch of audion (24) to constitute and cut off the return circuit, connect the relay protection 1 of circuit break relay protection 0 (23) in thebase of switch of audion (24), power -off signal switches on through circuit break microprocessor (23) control switch of audion (24), current relay normally closed contact (26) disconnection to the power supply's of relay prot