CN219643581U - Circuit breaker - Google Patents

Abstract

The embodiment of the utility model provides a circuit breaker, which comprises a circuit breaker body and a fault protection module integrated on the circuit breaker body, wherein the fault protection module comprises a main control circuit, a tripping circuit, a fault arc monitoring circuit and an overvoltage protection circuit which are respectively and electrically connected to the main control circuit; the fault arc monitoring circuit is configured to monitor an arc signal of a circuit breaker main circuit, the overvoltage protection circuit is configured to output an overvoltage trigger signal to the main control circuit when an overvoltage occurs in the circuit breaker main circuit, and the main control circuit is configured to trigger the trip circuit to open the circuit breaker main circuit when the arc signal exceeds an arc signal threshold value and when the overvoltage trigger signal is received, respectively.

Description

Circuit breaker

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a circuit breaker.

Background

A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time. In the related art, the functions of most circuit breakers are single, and a circuit protection device independent of the circuit breakers is required to be configured in an end branch of an electricity consumption place, so that more and messy electric circuit devices are needed, and the occupied volume is larger; while part of the circuit breakers integrate fault protection functions, the signal detection and trigger judgment accuracy of the circuit breakers is poor, and the problem that the fault protection functions are totally invalid easily occurs.

Disclosure of Invention

The embodiment of the utility model provides a circuit breaker, which is provided with a fault protection module integrated on a circuit breaker body, has higher signal detection and trigger judgment accuracy, and can still play a role in protecting other fault types when part of protection functions fail.

The circuit breaker provided by the embodiment of the utility model comprises a circuit breaker body and a fault protection module integrated on the circuit breaker body, wherein the fault protection module comprises a main control circuit, a tripping circuit, a fault arc monitoring circuit and an overvoltage protection circuit which are respectively and electrically connected to the main control circuit; the fault arc monitoring circuit is configured to monitor an arc signal of a circuit breaker main circuit, the overvoltage protection circuit is configured to output an overvoltage trigger signal to the main control circuit when an overvoltage occurs in the circuit breaker main circuit, and the main control circuit is configured to trigger the trip circuit to open the circuit breaker main circuit when the arc signal exceeds an arc signal threshold value and when the overvoltage trigger signal is received, respectively.

In some embodiments, the fault protection module further includes a residual current protection circuit electrically connected to the trip circuit, the residual current protection circuit configured to collect a residual current of a circuit breaker main loop and trigger the trip circuit to open the circuit breaker main loop when the residual current of the circuit breaker main loop exceeds a residual current threshold.

In some embodiments, the residual current protection circuit includes a residual current sensor configured to collect residual current from the circuit breaker main loop and a comparison control sub-circuit configured to compare the residual current from the circuit breaker main loop to a residual current threshold and trigger the trip circuit when the residual current from the circuit breaker main loop exceeds the residual current threshold.

In some embodiments, the residual current sensor is a zero sequence current transformer and the comparison control sub-circuit includes a leakage chip.

In some embodiments, the residual current protection circuit is further electrically connected to the main control circuit to output a trigger signal to the main control circuit, and the main control circuit is configured to determine a trip type corresponding to the trigger signal according to the trigger signal.

In some embodiments, the fault arc monitoring circuit includes a primary loop current sensor configured to collect a current signal of a breaker primary loop and an arc signal conversion sub-circuit configured to convert the current signal of the breaker primary loop into an arc signal, the arc signal conversion sub-circuit and the master circuit being electrically connected in sequence.

In some embodiments, the primary loop current sensor is a shunt.

In some embodiments, the overvoltage protection circuit is configured to collect a voltage of a circuit breaker main loop and output an overvoltage trigger signal to the master circuit when the voltage of the circuit breaker main loop exceeds a voltage threshold.

In some embodiments, the overvoltage protection circuit is a voltage detection chip or a comparator that outputs a high level or a low level signal when the voltage of the circuit breaker main loop exceeds a voltage threshold.

In some embodiments, the master control circuit is configured to determine a trip type corresponding to the overvoltage trigger signal according to the overvoltage trigger signal.

In some embodiments, the trip circuit includes a trip control sub-circuit and a trip, the trip control sub-circuit being electrically connected to the main control circuit and the overvoltage protection circuit, respectively, the trip control sub-circuit being configured to execute a trip command to trigger the trip to open the circuit breaker main loop.

According to the embodiment of the utility model, on one hand, the fault protection module is integrated on the circuit breaker body, and can trigger to disconnect the circuit breaker when fault arc and overvoltage occur in the power utilization line, so that the fault protection effect on the power utilization line and the power utilization device in the power utilization line is correspondingly achieved, and a circuit protection device is not required to be independently configured in the power utilization line, so that the condition that the number and arrangement of circuit devices are more and messy and meanwhile, the circuit installation space is compressed is avoided; on the other hand, through setting up independent master control circuit and overvoltage protection circuit each other, carry out fault arc protection by master control circuit according to fault arc monitoring circuit's electric arc signal, and carry out overvoltage detection and trigger judgement function by overvoltage protection circuit is special, overvoltage protection circuit's testing result and trigger judgement are more accurate, make trigger protection more in time, and when overvoltage protection circuit became invalid, master control circuit can not receive the influence, can continue normal realization fault arc protection function, has higher security and stability, avoid appearing the problem that fault protection function wholly became invalid.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a circuit layout structure diagram of a circuit breaker provided by some embodiments of the utility model;

fig. 2 is a circuit connection structure diagram of a circuit breaker according to some embodiments of the present utility model.

Description of main reference numerals:

102-fault protection module, 10-master control circuit, 20-tripping circuit, 30-fault arc monitoring circuit, 31-main loop current sensor, 32-arc signal conversion sub-circuit, 40-overvoltage protection circuit, 50-residual current protection circuit, 51-residual current sensor and 52-comparison control sub-circuit.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

The use of "adapted" or "configured" in this disclosure is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps. In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

In the present utility model, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the utility model with unnecessary detail. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

As shown in fig. 1, the embodiment of the utility model provides a circuit breaker, which comprises a circuit breaker body and a fault protection module 102 integrated on the circuit breaker body, has higher signal detection and trigger judgment accuracy, and can still play a role in protecting other fault types when part of protection functions fail.

The breaker body is the body structure of the breaker, and the breaking function is executed. The fault protection module 102 is integrated on the breaker body, for example, may be integrated in a housing of the breaker body or fixedly disposed on an outer surface of the breaker body, so that the breaker body and the fault protection module 102 form an integrated structure, thereby providing a breaker structure with a fault protection function.

Here, the fault protection module 102 includes a main control circuit 10, a trip circuit 20, a fault arc monitoring circuit 30, and an overvoltage protection circuit 40, and the trip circuit 20, the fault arc monitoring circuit 30, and the overvoltage protection circuit 40 are electrically connected to the main control circuit 10, respectively. The fault arc monitoring circuit 30 is configured to monitor an arc of the main circuit of the circuit breaker, and the overvoltage protection circuit 40 is configured to output an overvoltage trigger signal to the main control circuit 10 when an overvoltage occurs in the main circuit of the circuit breaker. The main control circuit 10 is configured to compare the arc signal with the arc signal threshold value and trigger the trip circuit 20 when the arc signal exceeds the arc signal threshold value to trigger the trip circuit 20 when the main circuit of the circuit breaker breaks down an arc, and to trigger the trip circuit 20 when the above-mentioned overvoltage trigger signal is received to trigger overvoltage protection when the main circuit of the circuit breaker breaks down. When the tripping circuit 20 is triggered, the tripping circuit 20 executes tripping action to disconnect the main circuit of the breaker, so as to protect the power consumption line and the electric appliances thereof when line faults occur.

According to the circuit breaker provided by the embodiment of the utility model, the fault protection module 102 is integrally arranged on the circuit breaker body, the fault protection module 102 can trigger to disconnect the circuit breaker when fault arc and overvoltage occur in the power utilization line, the corresponding fault protection effect on the power utilization line and the power utilization device therein is achieved, and the circuit breaker integrated with the fault arc protection and the overvoltage protection is high in cost, the fault protection module 102 enables the circuit breaker to be disconnected when faults such as the fault arc and the overvoltage occur in the power utilization line, and electronic components in the circuit breaker can be protected to prevent the circuit breaker body from being damaged; the circuit breaker is provided with the fault protection module 102 which is integrally arranged, and a circuit protection device does not need to be independently configured in an electric circuit, so that the condition that the quantity and arrangement of circuit devices are more and disordered, and meanwhile, the circuit installation space is compressed is avoided, and the protection of a circuit breaker body can be realized.

Compared with the related art, the circuit breaker provided by the embodiment of the utility model is provided with the main control circuit 10 and the overvoltage protection circuit 40 which are independent of each other, the main control circuit 10 performs fault arc protection according to the arc signal of the fault arc monitoring circuit 30, and the overvoltage protection circuit 40 performs overvoltage protection, on one hand, the overvoltage protection circuit 40 specially performs overvoltage detection and trigger judgment functions, the detection result and the trigger judgment are more accurate, and the trigger protection is more timely, on the other hand, when the overvoltage protection circuit 40 fails, the main control circuit 10 is not influenced, the fault arc protection function can be continuously and normally realized, and the circuit breaker has higher safety and stability, and the problem of integral failure of the fault protection function is avoided.

In some embodiments, the fault protection module 102 may include the residual current protection circuit 50. The residual current protection circuit 50 may be configured to collect residual current of the circuit breaker main loop and trigger the trip circuit 20 to open the circuit breaker main loop when the residual current of the circuit breaker main loop exceeds a residual current threshold. When the residual current collected by the residual current protection circuit 50 exceeds the residual current threshold value, the existence of leakage risk in the main circuit of the circuit breaker can be determined; at this time, the residual current protection circuit 50 may send a trigger electrical signal to the trip circuit 20, so that the trip circuit 20 is triggered, and the trip circuit 20 performs a trip action to disconnect the main circuit of the circuit breaker, thereby achieving the purpose of leakage protection.

The hardware configuration of the residual current protection circuit 50 may be determined according to actual needs, and the embodiment of the present utility model is not limited thereto. As shown in fig. 1-2, in some examples, the residual current protection circuit 50 may include a residual current sensor 51 and a comparison control sub-circuit 52 electrically connected in sequence, and the comparison control sub-circuit 52 may be electrically connected with the trip circuit 20. The residual current sensor 51 is configured to collect residual current of the circuit breaker main loop, and the comparison control subcircuit 52 is configured to compare the residual current of the circuit breaker main loop with a residual current threshold and trigger the trip circuit 20 when the residual current of the circuit breaker main loop exceeds the residual current threshold.

The type of the residual current sensor 51 may be determined according to actual needs, and the embodiment of the present utility model is not limited thereto. The residual current sensor 51 may be a zero sequence current transformer, for example. The hardware configuration of the comparison control sub-circuit 52 may be determined according to actual needs, which is not limited in the embodiment of the present utility model. By way of example, the comparison control subcircuit 52 may include a leakage chip, which may be, for example, a 54123A leakage chip, a 2147 leakage chip, or the like. In this way, the residual current protection circuit 50 may be composed of a pure circuit hardware structure, and achieve a corresponding leakage protection function without involving software development.

In some examples, the residual current protection circuit 50 is further electrically connected to the master circuit 10 to output a trigger signal to the master circuit 10, and the master circuit 10 is configured to determine a trip type corresponding to the trigger signal according to the trigger signal. For example, the comparison control sub-circuit 52 may be electrically connected to the main control circuit 10 to output a trigger signal to the main control circuit 10, so that the main control circuit 10 knows that the trip belongs to the leakage protection trip according to the trigger signal, and may further transmit the trip type to a remote server through the main control circuit 10 or display the trip type through a circuit breaker.

The hardware configuration of the fault arc monitoring circuit 30 may be determined according to actual needs, and the embodiment of the present utility model is not limited thereto. In some embodiments, the fault arc monitoring circuit 30 may include a main loop current sensor 31 and an arc signal conversion subcircuit 32 electrically connected in sequence, and the arc signal conversion subcircuit 32 may be electrically connected with the main control circuit 10. The main loop current sensor 31 is configured to collect current signals of the main loop of the circuit breaker, and the arc signal conversion sub-circuit 32 is configured to convert the current signals of the main loop of the circuit breaker into arc signals to detect and identify fault arcs and normal operation arcs in the line; and the master circuit 10 may compare the arc signal to an arc signal threshold. When the arc signal exceeds the arc signal threshold, it may be determined that a fault arc has occurred in the line, at which time the master circuit 10 may trigger the trip circuit 20, and the trip circuit 20 performs a trip action to open the main circuit of the circuit breaker.

The type of the main loop current sensor 31 may be determined according to actual needs, and the embodiment of the present utility model is not limited thereto. In some examples, the main loop current sensor 31 may be a shunt. The type of the arc signal converting sub-circuit 32 may be determined according to actual needs, and the embodiment of the present utility model is not limited thereto. In some examples, the arc signal conversion subcircuit 32 may be an operational amplifier circuit.

In other embodiments, the fault arc monitoring circuit 30 may include an arc detection inductor configured to detect a fault arc in the circuit breaker main loop. Here, the arc detection inductor may be electrically connected to the main control circuit 10 to output a detected fault arc signal to the main control circuit 10, and the main control circuit 10 sends a trigger electrical signal to the trip circuit 20 according to the fault arc signal to trigger the trip circuit 20 to disconnect the main circuit of the circuit breaker, thereby achieving the purpose of fault arc protection.

In some embodiments, the overvoltage protection circuit 40 may be configured to collect the voltage of the circuit breaker main loop and trigger the trip circuit 20 when the voltage of the circuit breaker main loop exceeds a voltage threshold. When the voltage of the main circuit of the circuit breaker exceeds the voltage threshold, the overvoltage problem in the circuit can be determined, and at the moment, the overvoltage protection circuit 40 can send a trigger electric signal to the tripping circuit 20 to trigger the tripping circuit 20 to disconnect the main circuit of the circuit breaker, so that the overvoltage protection purpose is realized.

The hardware configuration of the overvoltage protection circuit 40 may be determined according to actual needs, and the embodiment of the present utility model is not limited thereto. In some examples, the overvoltage protection circuit 40 may be a voltage detection chip or comparator; when the voltage of the main circuit of the circuit breaker exceeds a voltage threshold value, the voltage detection chip or the comparator outputs an overvoltage trigger signal such as a high level or low level signal. Here, the voltage detection chip or the comparator may be electrically connected to the trip circuit 20 through the main control circuit 10; thus, the voltage detection chip or the comparator outputs a trigger signal such as a high level or a low level to the main control circuit 10, and the main control circuit 10 can trigger the trip circuit 20 according to the high level or the low level signal.

In some examples, the master circuit 10 may be further configured to determine a trip type corresponding to the over-voltage trigger signal according to the over-voltage trigger signal. For example, when the overvoltage protection circuit 40 includes a voltage detection chip or a comparator, the voltage detection chip or the comparator may be electrically connected to the main control circuit 10 to output an overvoltage trigger signal to the main control circuit 10, so that the main control circuit 10 knows that the trip belongs to the overvoltage protection trip according to the overvoltage trigger signal, and may further transmit the trip to a remote server through the main control circuit 10 or display the trip type through a circuit breaker.

In some embodiments, the front end of the overvoltage protection circuit 40 may collect the voltage of the main loop through a resistive voltage divider. For example, the resistor divider may include a first resistor connected to a phase pole (L-pole) of the circuit breaker main circuit and a second resistor connected to a negative pole (N-pole) of the circuit breaker main circuit.

The hardware configuration of the trip circuit 20 may be determined according to actual needs, which is not limited in the embodiment of the present utility model. In some embodiments, trip circuit 20 may include a trip control subcircuit and a trip unit. The tripping control sub-circuit is respectively and electrically connected with the main control circuit 10 and the overvoltage protection circuit 40, and is configured to execute a tripping command to trigger the tripper so as to disconnect the main circuit of the circuit breaker and realize the corresponding tripping protection purpose. Here, the trip command may be issued by any one of the main control circuit 10 and the residual current protection circuit 50.

The circuit breaker provided by the embodiment of the present utility model has been described in detail, and specific examples are applied to illustrate the principle and implementation of the present utility model, and the description of the above embodiments is only used to help understand the method and core idea of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims (10)

1. The circuit breaker is characterized by comprising a circuit breaker body and a fault protection module (102) integrated on the circuit breaker body, wherein the fault protection module (102) comprises a main control circuit (10), and a tripping circuit (20), a fault arc monitoring circuit (30) and an overvoltage protection circuit (40) which are respectively and electrically connected to the main control circuit (10); the fault arc monitoring circuit (30) is configured to monitor an arc signal of a breaker main circuit, the overvoltage protection circuit (40) is configured to output an overvoltage trigger signal to the main control circuit (10) when an overvoltage occurs in the breaker main circuit, and the main control circuit (10) is configured to trigger the trip circuit (20) to open the breaker main circuit when the arc signal exceeds an arc signal threshold and when the overvoltage trigger signal is received, respectively.

2. The circuit breaker of claim 1, wherein the fault protection module (102) further comprises a residual current protection circuit (50) electrically connected to the trip circuit (20), the residual current protection circuit (50) configured to collect a residual current of the circuit breaker main circuit and trigger the trip circuit (20) to open the circuit breaker main circuit when the residual current of the circuit breaker main circuit exceeds a residual current threshold.

3. The circuit breaker according to claim 2, characterized in that the residual current protection circuit (50) comprises a residual current sensor (51) and a comparison control sub-circuit (52) electrically connected in sequence, the residual current sensor (51) being configured to collect the residual current of the circuit breaker main circuit, the comparison control sub-circuit (52) being configured to compare the residual current of the circuit breaker main circuit with a residual current threshold value and to trigger the trip circuit (20) when the residual current of the circuit breaker main circuit exceeds the residual current threshold value.

4. A circuit breaker according to claim 3, characterized in that the residual current sensor (51) is a zero sequence current transformer and the comparison control sub-circuit (52) comprises a leakage chip.

5. The circuit breaker according to claim 2, characterized in that the residual current protection circuit (50) is further electrically connected to the main control circuit (10) for outputting a trigger signal to the main control circuit (10), the main control circuit (10) being configured to determine the trip type to which the trigger signal corresponds according to the trigger signal.

6. The circuit breaker according to claim 1, characterized in that the fault arc monitoring circuit (30) comprises a main loop current sensor (31) and an arc signal converting sub-circuit (32) electrically connected in sequence, the main loop current sensor (31) being configured to collect a current signal of a main loop of the circuit breaker, the arc signal converting sub-circuit (32) being configured to convert the current signal of the main loop of the circuit breaker into an arc signal, the arc signal converting sub-circuit (32) being electrically connected with the main control circuit (10).

7. Circuit breaker according to claim 6, characterized in that the main loop current sensor (31) is a shunt.

8. The circuit breaker according to claim 1, characterized in that the overvoltage protection circuit (40) is configured to collect the voltage of the circuit breaker main circuit and to output an overvoltage trigger signal to the main control circuit (10) when the voltage of the circuit breaker main circuit exceeds a voltage threshold.

9. The circuit breaker according to claim 8, characterized in that the overvoltage protection circuit (40) is a voltage detection chip or a comparator which outputs a high or low signal when the voltage of the circuit breaker main loop exceeds a voltage threshold; and/or the main control circuit (10) is further configured to determine the tripping type corresponding to the overvoltage trigger signal according to the overvoltage trigger signal.

10. The circuit breaker according to claim 1, characterized in that the trip circuit (20) comprises a trip control sub-circuit and a release, the trip control sub-circuit being electrically connected to the main control circuit (10), the overvoltage protection circuit (40), respectively, the trip control sub-circuit being configured to execute a trip command to trigger the release to open the circuit breaker main circuit.