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

A power supply system and monitoring device technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as the inconvenience of leakage monitoring, and achieve the effects of avoiding false alarms, power outage losses, current false alarms, and damages

CN110174586APending Publication Date: 2019-08-27BEIJING HANGTIAN CHANGXING S & T DEV CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-08-27

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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.
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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...

Examples

Embodiment Construction

[0020] Such as figure 1 As shown, the dual power supply system in the prior art includes: the first power supply line (A, B, C three-phase line and neutral line N), the second power supply line (A, B, C three-phase line and neutral line N ), the first power supply line and the second power supply line are connected to the load (there may be multiple loads, seven of which are exemplarily listed in the figure) through a 3p switch. Depend on figure 1 It can be seen that the 3p switch is only connected to the three-phase lines A, B, and C, and the neutral line N bypasses the 3p switch, so it can ensure that the neutral line is continuous during the switching process and that no switching accidents occur during the switching process.

[0021] For the above dual power supply system, such as image 3 As shown, the present embodiment provides a double-circuit power supply system anti-leakage false alarm monitoring device, which includes: a first current transformer 101, a second cur...