Double-circuit power supply system and false electric leakage alarm preventing monitoring device and method thereof

Abstract

The invention discloses a false electric leakage alarm preventing monitoring device and method of a double-circuit power supply system. The double-circuit power supply system comprises a first power supply line and a second power supply line, wherein the first power supply line and the second power supply line are connected with a load through a 3p switch. The monitoring device comprises a first current transformer, a second current transformer and a detector, wherein the first current transformer sleeves on an A, B, C three-phase line and a null line N of the first power supply line; the second current transformer sleeves on an A, B, C three-phase line and a null line N of the second power supply line; secondary coils of the first current transformer and the second current transformer areconnected in parallel; the polarities of the parallel ends of the coils are same; and the circuit after the parallel connection is connected with the detector. The invention also discloses the double-circuit power supply system comprising the monitoring device. The system disclosed by the invention has the advantages that the current transformers are arranged in parallel to enable the electric field and the magnetic field to cancel each other, so that the electric leakage can be effectively discriminated, the loss caused by the false alarm can be avoided and the real electric leakage can be monitored.

Description

technical field [0001] The invention relates to the field of leakage prevention monitoring of a power supply system, in particular to a dual-circuit power supply system and its leakage prevention false alarm monitoring device and monitoring method. Background technique [0002] The dual power supply system is a commonly used power supply system nowadays. It is mainly aimed at some high-demand primary loads. It needs to be equipped with two power supplies at the same time. When one power supply fails, the other power supply can be activated. However, in the existing dual power supply system, two transformers are generally used to supply power to the load through a dual power supply switching switch. The dual power supply switch mainly includes 3p switch and 4P switch. The 3P switch is used for the wiring of three live wires (A, B, C three-phase lines), the neutral line N is not connected, and the 4P switch is used for the three live wires (A, B, and C three-phase lines). , B...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the above-mentioned existing two-way power supply system still has inconvenience and defects in leakage monitoring, and needs to be further improved urgently.

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