Wiring control circuit of circuit breaker

Abstract

The utility model provides a wiring control circuit of a breaker, which comprises a power supply U, a working loop and a fault alarm loop, the working loop comprises a switching power supply conversion device, a control and sampling device and a working device M which are connected in series, and the fault alarm loop comprises a change-over switch S1, a branch A and a branch B, a contact of the change-over switch S1 can be connected with a branch A or a branch B, the branch A is connected to a control and sampling device, a fault alarm device L1 is arranged on the branch B, the branch B is connected with a power supply U in series, and when the circuit breaker works normally, the contact of the change-over switch S1 is communicated with the branch A; when the circuit breaker trips due to a fault, the contact of the change-over switch S1 is switched to be communicated with the branch B; an external manual and automatic indication loop and a fault alarm loop are arranged, remote electric control of the circuit breaker can be limited through a change-over switch S1 after the circuit breaker trips due to a fault, only local manual control can be achieved, and remote indication of fault alarm and indication of a manual operation mode are achieved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a wiring control circuit for a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. It is mainly used to perform switching operations on power distribution circuits, motors, or other electrical equipment and to provide protection, playing a crucial role in power systems.

[0003] If a circuit breaker trips unexpectedly due to a fault, it must remain in the reset state until the fault is completely resolved; closing the circuit breaker is strictly prohibited. Unauthorized closing before the fault has been cleared could lead to a series of serious consequences, such as equipment damage, short circuits, or even a failure of the entire power system, affecting power supply over a wide area, causing production stoppages, inconvenience, and potentially endangering personnel safety. Therefore, to prevent accidental closing before the fault has been cleared, appropriate measures should be taken, including providing the remote control terminal with a trip signal, a signal indicating that manual operation is currently in effect, and prohibiting remote control. Summary of the Invention

[0004] The purpose of this invention is to provide a wiring control circuit for a circuit breaker to solve the above-mentioned problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A circuit breaker wiring control circuit includes a power supply U, a working circuit, and a fault alarm circuit. The working circuit includes a switching power supply conversion device, a control and sampling device, and a working device M connected in series. The fault alarm circuit includes a switching switch S1, a branch A, and a branch B. The contacts of the switching switch S1 can be connected to either branch A or branch B. Branch A is connected to the control and sampling device. A fault alarm device L1 is installed on branch B. Branch B is connected in series with the power supply U. When the circuit breaker is working normally, the contacts of the switching switch S1 are connected to branch A; when the circuit breaker trips due to a fault, the contacts of the switching switch S1 switch to be connected to branch B.

[0007] As a further improvement of this utility model, the fault alarm device L1 is an alarm indicator light.

[0008] As a further improvement of this utility model, the fault alarm device L1 is an audible and visual alarm.

[0009] As a further improvement of this utility model, the control and sampling device is a low-voltage control and sampling device.

[0010] As a further improvement of this utility model, the fault alarm circuit is provided with a tripping branch C and a closing branch D connected in parallel. The tripping branch C is used to receive the tripping signal, and the closing branch D is used to receive the closing signal.

[0011] As a further improvement of this utility model, an isolation sampling device is also provided between the combined output terminal of branch A, branch C and branch D of the fault alarm circuit and the low-voltage control and sampling device.

[0012] As a further improvement of this utility model, the power supply U is also connected to a manual / automatic indicator circuit, which is connected in parallel with the working circuit.

[0013] As a further improvement of the present invention, the manual / automatic indicator circuit includes a manual / automatic switch S2 and a manual mode indicator light L2 connected in series, wherein the manual / automatic switch S2 is a normally open switch.

[0014] As a further improvement of this utility model, a sampling control circuit is provided in parallel on the control and sampling device. The sampling control circuit includes a sampling switch, which is a normally open switch.

[0015] As a further improvement of this utility model, the power supply U is a rated voltage power supply U, and the switching power supply conversion device outputs 24V DC power.

[0016] The beneficial effects of this utility model are as follows:

[0017] With the above structure, an external manual / automatic indication circuit and a fault alarm circuit are set up. By switching switch S1, after the circuit breaker trips due to a fault, its remote electric control can be restricted, and it can only be manually controlled locally. This realizes the remote indication of the fault alarm and the indication of the manual operation mode. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wiring control circuit of a circuit breaker. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0020] If the description of this utility model involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.), then the directions involved need to be defined. For example, "To clearly express the position and direction described in this utility model, the operator of the instrument is used as a reference, the end closer to the operator is the proximal end, and the end farther from the operator is the distal end." Or, the paper can be used as a reference. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, then this definition is not required.

[0021] A circuit breaker wiring control circuit includes a power supply U, a working circuit, and a fault alarm circuit. The working circuit includes a switching power supply conversion device, a control and sampling device, and a working device M connected in series. The working circuit is connected in series with the power supply U and is powered by the power supply U. The fault alarm circuit includes a switching switch S1, a branch A, and a branch B. The contacts of the switching switch S1 can be connected to either branch A or branch B. Branch A is connected to the control and sampling device. A fault alarm device L1 is installed on branch B. Branch B is connected in series with the power supply U. When the circuit breaker is operating normally without a fault trip, the contacts of the switching switch S1 are connected to branch A; when the circuit breaker trips due to a fault, the contacts of the switching switch S1 are switched to be connected to branch B.

[0022] In one embodiment of this utility model, the switching switch S1 can be a single-pole double-throw switch. The single-pole double-throw switch is normally connected to branch A. The switching switch S1 is linked to the circuit breaker. When the circuit breaker trips due to a fault, the single-pole double-throw switch connects to branch B, energizing the fault alarm device L1. When the circuit breaker is operating normally, the single-pole double-throw switch connects to branch A, and the fault alarm device L1 is de-energized, thus achieving remote indication of the fault alarm.

[0023] In one embodiment of this utility model, the fault alarm device L1 is an alarm indicator light.

[0024] As one embodiment of this utility model, the fault alarm device L1 is an audible and visual alarm.

[0025] As one embodiment of this utility model, the control and sampling device is a low-voltage control and sampling device. Through precise sampling and control logic, it can achieve real-time monitoring and accurate judgment of the circuit status. The low-voltage sampling section collects various signals inside the electric operating mechanism (including voltage signals, current signals, internally set position signals, or signals from limit switches, etc.) to determine the internal status of the mechanism or the position of components, such as whether the circuit is closed, open, or currently in manual or automatic operation mode. It converts continuous analog signals into discrete digital signals and sends them to the controller. Based on these parameters and preset control logic, the controller adjusts the operating status through the low-voltage control circuit, improving safety, enhancing system stability and reliability, and facilitating remote monitoring and intelligent management.

[0026] In one embodiment of this utility model, a tripping branch C and a closing branch D are connected in parallel on the fault alarm circuit. The tripping branch C can receive tripping signals, and the closing branch D can receive closing signals.

[0027] In one embodiment of this utility model, an isolation sampling device is further provided between the combined output terminal of branch A, branch C, and branch D of the fault alarm circuit and the low-voltage control and sampling device. The isolation sampling circuit can isolate the input signal from other parts of the circuit through an isolation device, thereby reducing the impact of interference and noise on the circuit and improving its stability and reliability. When the input signal changes, the isolation device transmits it to the output terminal while maintaining electrical isolation between the input and output terminals. Thus, even if there is significant interference and noise at the input terminal, it will not affect the output terminal, improving the accuracy of sampling.

[0028] In one embodiment of this utility model, the power supply U is also connected to a manual / automatic indicator circuit, which is connected in parallel with the working circuit.

[0029] The manual / automatic indicator circuit includes a manual / automatic switch S2 and a manual mode indicator light L2 connected in series. The manual / automatic switch S2 is a normally open switch. When the circuit breaker is operating normally in remote automatic control mode, the manual / automatic switch S2 remains open, and the manual mode indicator light L2 is not energized. When the circuit breaker switches to local manual control mode due to demand or tripping maintenance, the manual / automatic switch S2 closes, the manual / automatic indicator circuit is connected, and the manual mode indicator light L2 is energized and illuminates, indicating to the operator that the circuit breaker is currently in local manual control mode, thus realizing remote indication of the electric manual / automatic status.

[0030] As an embodiment of the present invention, a sampling control circuit is provided in parallel on the control and sampling device, and the sampling control circuit includes a sampling switch S3, which is a normally open switch.

[0031] In one embodiment of this utility model, the power supply U is a rated voltage power supply, and the switching power supply conversion device can output 24V DC power. The rated voltage power supply can accept a wide range of voltages applicable to both AC and DC.

[0032] The wiring control circuit of the circuit breaker provided by this utility model is equipped with an external manual / automatic indication circuit and a fault alarm circuit. By switching switch S1, after the circuit breaker trips due to a fault, remote electric control can be restricted, and only local manual control is possible. It also realizes remote indication of fault alarm and indication of manual operation mode.

[0033] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0034] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A wiring control circuit for a circuit breaker, characterized in that: The circuit includes a power supply U, a working circuit, and a fault alarm circuit. The working circuit includes a switching power supply conversion device, a control and sampling device, and a working device M connected in series. The fault alarm circuit includes a switching switch S1, branch A, and branch B. The contacts of the switching switch S1 can be connected to either branch A or branch B. Branch A is connected to the control and sampling device. A fault alarm device L1 is installed on branch B. Branch B is connected in series with the power supply U. When the circuit breaker is working normally, the contacts of the switching switch S1 are connected to branch A; when the circuit breaker trips due to a fault, the contacts of the switching switch S1 switch to be connected to branch B.

2. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: The fault alarm device L1 is an alarm indicator light.

3. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: The fault alarm device L1 is an audible and visual alarm.

4. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: The control and sampling device is a low-voltage control and sampling device.

5. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: The fault alarm circuit is provided with a tripping branch C and a closing branch D connected in parallel. The tripping branch C is used to receive the tripping signal, and the closing branch D is used to receive the closing signal.

6. The wiring control circuit of the circuit breaker according to claim 5, characterized in that: An isolation sampling device is also provided between the combined output terminal of branch A, branch C and branch D of the fault alarm circuit and the low-voltage control and sampling device.

7. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: The power supply U is also connected to the manual / automatic indicator circuit, which is connected in parallel with the working circuit.

8. The wiring control circuit of the circuit breaker according to claim 7, characterized in that: The manual / automatic indicator circuit includes a manual / automatic switch S2 and a manual mode indicator L2 connected in series. The manual / automatic switch S2 is a normally open switch.

9. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: A sampling control loop is connected in parallel on the control and sampling device. The sampling control loop includes a sampling switch S3, which is a normally open switch.

10. The wiring control circuit of the circuit breaker according to claim 1, characterized in that: The power supply U is a rated voltage power supply, and the switching power supply conversion device outputs 24V DC power.

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