CN-224232622-U - Circuit breaker and power system

CN224232622UCN 224232622 UCN224232622 UCN 224232622UCN-224232622-U

Abstract

The application provides a circuit breaker and a power system, wherein the circuit breaker comprises a contact switch assembly, a tripping unit, a protection unit and a target switching device, the contact switch assembly is configured to control on-off of a power line, the tripping unit is in transmission connection with the contact switch assembly, the tripping unit is configured to control the contact switch assembly, the protection unit is coupled with the power line and configured to output a control signal according to the current of the power line, the tripping unit only triggers the contact switch assembly to be disconnected when the power line breaks a first type of fault, and the protection unit only outputs a first control signal when the power line breaks a second type of fault, and the first control signal is configured to control the target switching device to be disconnected and the target switching device is configured to disconnect the power line. The application does not need to manually reset the circuit breaker after various circuit protection, thereby being beneficial to reducing the operation and maintenance workload of power maintenance personnel.

Inventors

HU JIQING
XU SHENGGUO
FANG GUANGZE
CHEN YUZHOU
HOU MINGMING
WANG HAIYUAN

Assignees

浙江正泰电器股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250428

Claims (13)

1. A circuit breaker, comprising: A contact switch assembly configured to control on-off of a power cord; The tripping unit is in transmission connection with the contact switch assembly and is configured to control the contact switch assembly to trip; A protection unit coupled to the power line, the protection unit being electrically connected to a target switching device, the protection unit being configured to output a control signal to the target switching device according to a magnitude of a current of the power line; The tripping unit only triggers the contact switch assembly to be disconnected when the power line has a first type of fault, and the protection unit only outputs a first control signal to the target switch device when the power line has a second type of fault; The first control signal is configured to control the target switching device to open, the target switching device being configured to disconnect the power line.
2. The circuit breaker of claim 1, wherein a current value of the power line when a first type of fault occurs is greater than a current value of the power line when a second type of fault occurs.
3. The circuit breaker of claim 2, wherein the first type of fault comprises a short circuit fault; The second type of faults include overload faults and/or locked rotor faults.
4. The circuit breaker of claim 1, wherein the protection unit comprises a current detector and a control circuit; The current detector is coupled with the power line, and the current detector is configured to detect the current magnitude of the power line; The control circuit is electrically connected with the current detector, and the control circuit is configured to output the control signal according to the current magnitude of the power line.
5. The circuit breaker of claim 4, wherein the circuit breaker has a first output terminal and a second output terminal configured to connect to the target switching device, the control circuit comprising a control chip and a first switch; The control chip is electrically connected with the current detector and is configured to output an enabling signal according to the current magnitude of the power line; the first switch is electrically connected with the first output terminal, and the first switch is electrically connected with the second output terminal; The enabling signal is used for controlling the first switch, and when the power line has a second type of fault, the first switch breaks a path between the first output terminal and the second output terminal.
6. The circuit breaker of claim 5, further having a third output terminal, the first output terminal and the third output terminal configured to connect to a fault indicator; The first switch is further electrically connected with the third output terminal, and when the power line has a second type of fault, the first switch conducts a passage between the first output terminal and the third output terminal.
7. The circuit breaker of claim 1, wherein the protection unit has an automatic reset mode; When the protection unit is in the automatic reset mode, the protection unit outputs a second control signal at intervals of preset time length after outputting the first control signal; wherein the second control signal is configured to control the target switching device to close.
8. The circuit breaker of claim 7, wherein the protection unit further has a manual reset mode; When the protection unit is in the manual reset mode, the protection unit outputs a second control signal after being manually powered off and restarted; wherein the second control signal is configured to control the target switching device to close.
9. The circuit breaker of claim 8, wherein the circuit breaker has a first auxiliary power terminal and a second auxiliary power terminal; The first auxiliary power terminal and the second auxiliary power terminal are electrically connected with the protection unit, and the first auxiliary power terminal and the second auxiliary power terminal are electrically connected with a target auxiliary power.
10. The circuit breaker of claim 8, wherein the circuit breaker comprises a knob switch electrically connected with the protection unit; when the knob switch rotates to a first gear, the protection unit is switched to the automatic reset mode; When the knob switch rotates to a second gear, the protection unit is switched to the manual reset mode.
11. The circuit breaker of claim 10, wherein the first gear includes a plurality of first sub-gears, and/or the current of the power line is not equal in magnitude when the protection unit outputs the first control signal when the knob switch is rotated to a different one of the first sub-gears The second gear comprises a plurality of second sub gears, and when the knob switch rotates to different second sub gears, the current of the power line is unequal when the protection unit outputs the first control signal.
12. The circuit breaker according to any one of claims 1 to 11, wherein the contact switch assembly comprises a contact switch and an operating mechanism; The contact switch is configured to control the on-off of a power line, the operating mechanism is in transmission connection with the contact switch, and the operating mechanism is in transmission connection with the tripping unit; When the power line has a first type of fault, the tripping unit triggers the operating mechanism, so that the operating mechanism triggers the contact switch to disconnect the power line.
13. An electrical power system, comprising: Circuit breaker according to any of claims 1 to 12 and a target switching device; Wherein the circuit breaker is opened only when a first type of fault occurs in the power system and the target switching device is opened only when a second type of fault occurs in the power system.

Description

Circuit breaker and power system Technical Field The application relates to the technical field of electric power, in particular to a circuit breaker and an electric power system. Background At present, a Circuit Breaker (Circuit Breaker) is a vital protection device in a power system, and can realize the functions of short-Circuit protection, overload protection, locked rotor protection, undervoltage protection and the like, so that the Circuit Breaker is widely applied to the fields of household electricity, industrial electricity, photovoltaic power generation, energy storage battery management, data cabinet power distribution management and the like. In the related art, the circuit breaker cannot be automatically reset after short-circuit protection, overload protection, locked rotor protection or under-voltage protection and the like are performed, and an electric power maintenance person is required to manually operate a handle of the circuit breaker to reset. However, when the circuit breaker is installed in a location inconvenient for manual operation (such as a top control cabinet of a wind driven generator), resetting the circuit breaker manually under various protection conditions increases the operation and maintenance workload of power maintenance personnel. Disclosure of utility model The application provides a circuit breaker and a power system, and aims to solve the technical problems. In a first aspect, the present application provides a circuit breaker comprising: a contact switch assembly configured to control on-off of the power line; the tripping unit is in transmission connection with the contact switch assembly and is configured to control the contact switch assembly to trip; The protection unit is coupled with the power line, is electrically connected with the target switching device and is configured to output a control signal to the target switching device according to the current of the power line; The tripping unit only triggers the contact switch assembly to be disconnected when the power line has a first type of faults, and the protection unit only outputs a first control signal to the target switch device when the power line has a second type of faults; the first control signal is configured to control a target switching device to open, the target switching device being configured to open the power line. In some embodiments, the current value when the power line fails in the first type is greater than the current value when the power line fails in the second type. In some embodiments, the first type of fault comprises a short circuit fault; the second type of faults includes overload faults and/or locked rotor faults. In some embodiments, the protection unit includes a current detector and a control circuit; a current detector coupled to the power line, the current detector configured to detect a magnitude of a current of the power line; The control circuit is electrically connected with the current detector and is configured to output a control signal according to the current magnitude of the power line. In some embodiments, the circuit breaker has a first output terminal and a second output terminal configured to connect to a target switching device, the control circuit including a control chip and a first switch; The control chip is electrically connected with the current detector and is configured to output an enabling signal according to the current of the power line; The first switch is electrically connected with the first output terminal, and the first switch is electrically connected with the second output terminal; The enabling signal is used for controlling the first switch, and when the power line has a second type of faults, the first switch breaks a path between the first output terminal and the second output terminal. In some embodiments, the circuit breaker further has a third output terminal, the first output terminal and the third output terminal being configured to connect to a fault indicator; the first switch is also electrically connected with the third output terminal, and when the power line has a second type of fault, the first switch conducts a passage between the first output terminal and the third output terminal. In some embodiments, the protection unit has an automatic reset mode; When the protection unit is in an automatic reset mode, the protection unit outputs a second control signal at intervals of preset time length after outputting the first control signal; wherein the second control signal is configured to control the target switching device to close. In some embodiments, the protection unit further has a manual reset mode; when the protection unit is in a manual reset mode, the protection unit outputs a second control signal after being manually powered off and restarted; the second control signal is configured to control the target switching device to close. In some embodiments, the circuit breaker has a first auxiliary power supply termi