Dual-power power supply circuit and device
A dual power supply and circuit technology, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency power arrangements, etc., can solve the problems of closing loop current, power distribution system damage, and inconsistency, so as to achieve simple circuit and avoid false closing , low-cost effect
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[0020] The dual power supply device includes a cabinet and a dual power supply circuit arranged in the cabinet, wherein the dual power supply circuit includes a three-phase bus, a first three-phase power supply 3, a second three-phase power supply 4, a circuit breaker K1, a first-phase power supply sequence relay, second phase sequence relay, double-position relay, closing circuit, opening circuit and pre-circuit. The first three-phase power supply 3 and the second three-phase power supply 4 are both 400V low-voltage power supplies after the 10kV high-voltage power supply is stepped down by the transformer 1. The first three-phase power supply 3 and the second three-phase power supply 4 pass through the two main transformer circuit breakers K2 respectively. Connected to the three-phase bus, the circuit breaker K1 is arranged on the three-phase bus, and is located between the first three-phase power source 3 and the second three-phase power source 4. Under normal circumstances, ...
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