Circuit and device for monitoring secondary circuit of circuit breaker
A secondary circuit and monitoring circuit technology, applied in the field of power equipment, can solve problems such as difficulty in promotion, increased cost, and increase in secondary circuit fault nodes, and achieve the effects of facilitating promotion, reducing the number, and simple methods
Inactive Publication Date: 2021-07-02
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
However, the method in the prior art will increase the number of faulty nodes in the secondary circuit and increase the possibility of secondary circuit failure. At the same time, this method modifies the secondary circuit and increases the cost, making it difficult to popularize
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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0038] figure 1 A schematic structural diagram of a circuit breaker secondary circuit monitoring circuit provided by an embodiment of the present invention, refer to figure 1 , The circuit breaker secondary circuit monitoring circuit provided by the embodiment of the present invention includes: a power module 20 , a current transformer 10 , a current acquisition circuit 30 , an amplification circuit 40 , a control circuit 50 and a voltage conversion circuit 60 .
[0039] The current transformer 10 is in one-to-on...
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The embodiment of the invention discloses a circuit and a device for monitoring a secondary circuit of a circuit breaker. The circuit comprises a power module, current transformers, a current acquisition circuit, an amplification circuit, a control circuit, and a voltage conversion circuit. The current transformers are in one-to-one correspondence with the sub-loops of the secondary loop; the current acquisition circuit comprises a voltage division circuit, a first comparison output circuit and a second comparison output circuit; the current acquisition circuit is used for acquiring current on the sub-loops; and the voltage conversion circuit is used for converting a current signal collected by the current transformer into a voltage signal. Compared with the prior art, according to the technical scheme provided by the embodiment of the invention, the original structure of the secondary circuit of the circuit breaker does not need to be damaged, whether the secondary circuit is complete or not can be determined by monitoring the change condition of the current only by hooking the current transformer on the secondary circuit, and the number of fault nodes in the secondary circuit is greatly reduced; and the method is simple and beneficial to popularization.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of power equipment, and in particular to a monitoring circuit and device for a secondary circuit of a circuit breaker. Background technique [0002] In the power system, there are a large number of circuit breakers. Whether the circuit breakers work reliably is closely related to the safe operation of the power system. Therefore, it is very important to monitor the secondary circuit of the circuit breaker. [0003] At present, the online monitoring method of the circuit breaker is mainly to judge whether the secondary circuit is complete by connecting a resistor in series with a Hall sensor in the secondary circuit. However, the method in the prior art will increase the number of faulty nodes in the secondary circuit and increase the possibility of secondary circuit failure. At the same time, this method modifies the secondary circuit and increases the cost, making it difficult to p...
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Login to View More IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 袁伟明温崇攀黄秋达吴灼权萧睿腾何其荣郭锦洪诸秀强秦康钟伟杰陈粤
Owner GUANGDONG POWER GRID CO LTD