Circuit breaker monitoring circuit and low-voltage protection device
A technology for monitoring circuits and circuit breakers, which is applied to circuit devices, emergency protection devices for automatic disconnection, circuit breaker testing, etc., and can solve the problems of inconvenient use of tripping circuit monitoring circuits
Pending Publication Date: 2021-07-09
CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD
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Problems solved by technology
[0004] Based on this, it is necessary to provide a circuit breaker monitoring circuit and a low-voltage protection device for the inconvenient use of the traditional tripping circuit monitoring circuit.
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[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described more fully hereinafter through the embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0019] In one embodiment, see figure 1 , provides a circuit breaker monitoring circuit, including a first isolator 210, a second isolator 220, a trip contact 300 and a controller 100, the first end of the primary side of the first isolator 210 is connected to the operating power supply, the first isolation The second end of the primary side of the isolator 210 is connected to the first contact of the circuit breaker, and the two ends of the trip contact 300 are respectively connected to the first end of the primary side of the first isolator 210 and the second end of the prima...
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The invention relates to a circuit breaker monitoring circuit and a low-voltage protection device; the circuit comprises a first isolator, a second isolator, a tripping contact and a controller; when the first isolator can normally access an operation voltage, a first voltage output by an output end of a secondary side of the first isolator is greater than a preset threshold voltage; when operation voltage can be normally accessed to the first isolator or operation voltage can be normally accessed to the tripping contact, second voltage output by the output end of the secondary side of the second isolator is larger than preset threshold voltage, and when a circuit between the circuit breaker monitoring circuit and the circuit breaker is disconnected, or the circuit in the circuit breaker is disconnected, the first voltage and the second voltage are both smaller than a threshold voltage. According to the circuit, the threshold voltage serves as the comparison standard of the first voltage and the second voltage, the appropriate threshold voltage can be set according to different operation voltage grades, the circuit can be applied to scenes of various voltage grades, the requirements of various operation voltages are met, and use is convenient and fast.
Description
technical field [0001] The present application relates to the technical field of relay protection, in particular to a circuit breaker monitoring circuit and a low-voltage protection device. Background technique [0002] The most direct control object of the power system is equipment such as circuit breakers. The circuit breaker is the most direct and important device to control grid equipment and lines. Therefore, in the field of relay protection, the operation of the circuit breaker and the monitoring of the circuit breaker are very important. The current low-voltage protection devices often integrate the functions of protection and operation circuits. The trip circuit is the most important circuit. If the cable between the device and the circuit breaker is damaged, or the circuit breaker fails to trip, it will bring certain economic losses, so the monitoring of the trip circuit status becomes very important. [0003] The traditional trip circuit monitoring circuit often...
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IPC IPC(8): G01R31/327H02H7/26H02H3/04H02H3/20
CPCG01R31/3272H02H7/26H02H3/04H02H3/20
Inventor 李肖博于杨习伟陈军健姚浩蔡田田陶伟李鹏
Owner CHINA SOUTHERN POWER GRID DIGITAL GRID RES INST CO LTD