Opening device of external circuit breaker

Abstract

The utility model discloses an opening device of an external circuit breaker. The opening device comprises a control power supply, an opening loop, a monitoring relay, a PLC control module and a switch control module. The opening loop comprises a control power supply positive electrode, a manual opening switch, a normally open contact of the circuit breaker body, a circuit breaker opening coil and a control power supply negative electrode which are connected in sequence; one end of the monitoring relay is connected with the positive electrode of the control power supply, and the other end is connected with the normally-open contact of the breaker body. The input end of the PLC control module is respectively connected with the manual opening switch, the normally open contact of the circuit breaker body and the output end of the monitoring relay, and the output end of the PLC control module is connected with the input end of the switch control module. According to the utility model, the PLC control module receives signals of the manual opening switch, the monitoring relay, the DCS opening module, the anti-tripping relay and the protection relay, so as to judge whether the secondary plugging contact is good or not and judge the current state of the circuit breaker, thereby improving the response speed and accuracy of opening detection.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breaker loop control, in particular to a tripping device for an external circuit breaker. Background Art

[0002] In the power system, the circuit breaker is one of the key devices to ensure the stable operation and safe control of the power grid. Especially in medium-voltage and low-voltage power systems, the external circuit breaker has been widely used because it has the functions of opening and closing the load current in the power line and the ability to break the fault current.

[0003] At present, the control of the external circuit breaker mainly relies on the connection of the secondary plug and the secondary socket in the switch cabinet and its secondary system. This connection method can ensure the reliable operation of the circuit breaker under normal circumstances, but in actual operation, various fault situations may be encountered, such as control power failure, poor contact of secondary plugging and unplugging, non-conduction of the contacts of the circuit breaker body, open circuit of the tripping electromagnet coil or jamming of the moving armature. These faults may cause the circuit breaker to fail to trip reliably, resulting in the continuous existence of the fault current, which will not only damage the equipment, but also may cause major accidents such as fire and explosion, posing a serious threat to personnel safety, equipment safety and the stable operation of the power system.

[0004] Therefore, in order to ensure the reliable tripping of the external circuit breaker in case of faults, it is necessary to improve and optimize the existing circuit breaker control system to improve its fault detection and response capabilities, and ensure that the fault current can be quickly and accurately cut off in an emergency, so as to ensure the safe and stable operation of the power system. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the utility model provides a tripping device for an external circuit breaker, which is used to ensure the reliable tripping of the circuit breaker in an emergency and reduce the safety risks in the operation of the power system.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A tripping device for an external circuit breaker includes a control power supply, a tripping circuit, a monitoring relay, a PLC control module and a switch control module;

[0008] The tripping circuit includes a positive control power supply, a manual tripping switch, a normally open contact of the circuit breaker body, a tripping coil of the circuit breaker and a negative control power supply connected in sequence; one end of the monitoring relay is connected to the positive control power supply, and the other end is connected to the normally open contact of the circuit breaker body;

[0009] The input terminals of the PLC control module are respectively connected to the manual opening switch, the normally open contacts of the circuit breaker body, and the output terminal of the monitoring relay. The output terminal of the PLC control module is connected to the input terminal of the switch control module.

[0010] Optionally, it further includes an anti-pumping relay and an anti-pumping resistor;

[0011] One end of the normally open contact of the anti-pumping relay is connected to the positive pole of the control power supply, and the other end is sequentially connected to the anti-pumping resistor, the current starting coil of the anti-pumping relay, and the normally open contact of the circuit breaker body.

[0012] Optionally, it further includes a protection relay; one end of the normally open contact of the protection relay is connected to the positive pole of the control power supply, and the other end is sequentially connected to the current holding coil of the protection relay and the normally open contact of the circuit breaker body.

[0013] The output terminal of the protection relay is connected to the input terminal of the PLC control module.

[0014] Optionally, it further includes a DCS opening module; one end of the DCS opening module is connected to the positive pole of the control power supply, and the other end is connected to the normally open contact of the circuit breaker body;

[0015] The output terminal of the DCS opening module is connected to the input terminal of the PLC control module.

[0016] Optionally, the switch control module includes a switch controller and a controller power supply;

[0017] The controller power supply is connected to the switch controller; the input terminal of the switch controller is connected to the output terminal of the PLC control module to receive the closing instruction of the PLC control module and control the closing of the manual opening switch.

[0018] Optionally, it further includes a circuit breaker switch cabinet, and the control power supply, the opening circuit, and the monitoring relay are all arranged inside the circuit breaker switch cabinet.

[0019] Optionally, the switch control module is fixed to the inner side of the door of the circuit breaker switch cabinet and is arranged opposite to the manual opening switch.

[0020] The beneficial effects provided by the embodiments of the present utility model:

[0021] The utility model receives the signals of the manual opening switch, monitoring relay, DCS opening module, anti - bounce relay, and protection relay through the PLC control module to judge whether the secondary plug - in contact is good and the current state of the circuit breaker. When any abnormal signal is detected, the device can respond in a timely manner, improving the response speed and accuracy of opening detection; the utility model drives the switch controller through the PLC control module, which can ensure that after the switch controller receives the opening instruction, it can quickly control the manual opening switch to close, realizing the reliable opening of the circuit breaker and avoiding the possible operation errors or delays in traditional manual opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Shows a circuit schematic diagram of the opening device provided according to the embodiments of the present specification;

[0024] Figure 2 Shows a schematic diagram of the structure of the PLC control module provided according to the embodiments of the present specification. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will describe in detail the features and exemplary embodiments of various aspects of the present application. In the following detailed description, many specific details are proposed to provide a comprehensive understanding of the present utility model. However, it is obvious to those skilled in the art that the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0026] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0027] Embodiment 1

[0028] Figure 1 Shows a circuit schematic diagram of the opening device according to the embodiments of the present specification

[0029] As Figure 1 , this embodiment discloses a tripping device for an external circuit breaker, including a control power supply, a tripping circuit, a monitoring relay KJ, a PLC control module, a switch control module, an anti-pumping module, a protection module, and a DCS tripping module;

[0030] In some embodiments, the tripping circuit includes a control power supply positive pole +KM1, a manual tripping switch TA, a normally open contact DL of the circuit breaker body, a circuit breaker tripping coil TQ, and a control power supply negative pole -KM1 connected in sequence;

[0031] Among them, in this embodiment, the manual tripping switch TA is a manual emergency tripping button of the circuit breaker.

[0032] Exemplarily, one end of the monitoring relay KJ is connected to the control power supply positive pole +KM1, and the other end is connected to the normally open contact DL of the circuit breaker body.

[0033] Exemplarily, the anti-pumping module includes an anti-pumping relay TBJ and an anti-pumping resistor;

[0034] One end of the normally open contact of the anti-pumping relay TBJ is connected to the control power supply positive pole +KM1, and the other end is sequentially connected to the anti-pumping resistor, the current starting coil of the anti-pumping relay TBJ, and the normally open contact DL of the circuit breaker body.

[0035] Exemplarily, the protection module includes a protection relay BCJ;

[0036] One end of the normally open contact of the protection relay BCJ is connected to the control power supply positive pole +KM1, and the other end is sequentially connected to the current holding coil of the protection relay BCJ and the normally open contact DL of the circuit breaker body.

[0037] Exemplarily, one end of the DCS tripping module is connected to the control power supply positive pole +KM1, and the other end is connected to the normally open contact DL of the circuit breaker body;

[0038] Specifically, after receiving the signal transmitted by the DCS, the DCS tripping module sends a DCS tripping instruction to the circuit breaker; among them, DCS is a Distributed Control System, which is an automation system used for monitoring and controlling industrial processes.

[0039] Figure 2 Shows a schematic diagram of the PLC control module structure provided according to the embodiments of this specification;

[0040] As Figure 2As shown, exemplarily, the input ends of the PLC control module are respectively connected to the output ends of the manual opening switch TA, the normally open contact DL of the circuit breaker body, the monitoring relay, the DCS opening module, and the protection relay BCJ, and the output end of the PLC control module is connected to the input end of the switch control module.

[0041] In some embodiments, it further includes a circuit breaker switch cabinet; wherein, the control power supply, the opening circuit, the monitoring relay KJ, the anti-pumping relay TBJ, the anti-pumping resistor, and the protection relay BCJ are all arranged inside the circuit breaker switch cabinet.

[0042] In some embodiments, the switch control module includes a switch controller and a controller power supply;

[0043] Exemplarily, the controller power supply is connected to the switch controller; the input end of the switch controller is connected to the output end of the PLC control module for receiving the closing instruction of the PLC control module to control the closing of the manual opening switch TA.

[0044] In this embodiment, the switch controller includes a high-power locking electromagnet and a moving armature assembly; the moving armature assembly is fixed to the inner side of the door of the circuit breaker switch cabinet and is arranged opposite to the manual opening switch TA of the circuit breaker. When the high-power locking electromagnet receives the opening instruction, it drives the moving armature assembly to push the manual opening switch TA of the circuit breaker.

[0045] The implementation principle of this embodiment is as follows: when the input end of the PLC control module receives any pulse signal sent from the manual opening switch TA and / or the DCS opening module and / or the protection relay BCJ, the circuit breaker performs an opening operation. At this time, the input end of the PLC control module receives the normally closed contact signal of the circuit breaker body and the normally open signal of the monitoring relay KJ in real time. If the monitoring relay KJ is in the closed state (indicating that the opening has started) and the normally closed contact of the circuit breaker body is in the open state (indicating that the opening has been completed), it is considered that the circuit breaker is in a reliable opening state at this time; if the normally closed contact of the circuit breaker body remains open and / or the monitoring relay KJ remains closed within the time T, it is considered that the circuit breaker is in an opening fault state, and the circuit fault signal and the non-opening-in-time fault alarm signal are transmitted to the DCS through the PLC control module; at the same time, the PLC control module sends an opening instruction to the switch controller, and the high-power locking electromagnet drives the moving armature assembly to push the manual opening switch TA of the circuit breaker to achieve reliable opening of the circuit breaker.

[0046] Among them, the circuit fault signal in this embodiment includes a control power supply fault signal and / or a break alarm signal of the opening circuit.

[0047] It should be noted that in some cases, the switch controller can also adopt devices such as motor drivers, pneumatic actuators, and hydraulic actuators to push the manual trip switch to achieve the function of remotely controlling the trip switch.

[0048] In summary, the utility model receives the signals of the manual trip switch TA, monitoring relay KJ, DCS trip module, anti-pumping relay TBJ, and protection relay BCJ through the PLC control module to judge whether the secondary plug-in contact is good and the current state of the circuit breaker. When any abnormal signal is detected, the device can respond in a timely manner, improving the response speed and accuracy of trip detection;

[0049] The utility model drives the switch controller through the PLC control module, which can ensure that after the switch controller receives the trip instruction, it can quickly control the manual trip switch TA to close, accurately drive the moving armature assembly to act, thereby pushing the manual trip switch TA of the circuit breaker to achieve reliable tripping of the circuit breaker, avoiding possible operation errors or delays in traditional manual tripping. At the same time, the control power cable of the utility model adopts a non-plug-in design, avoiding the problem of unreliable operation caused by poor secondary plug-in contact, and improving the stability and reliability of the system.

[0050] After the utility model detects the fault that the circuit breaker fails to trip in time, it will trigger an alarm signal and transmit the signal to the DCS to achieve remote monitoring and fault handling. Through the above reliable emergency trip system and fault alarm mechanism, the utility model can ensure quick power-off in case of emergency to protect the safety of equipment and personnel.

[0051] The above is only a preferred embodiment of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the utility model is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the utility model.

Claims

1. A tripping device for an external circuit breaker, comprising a control power supply and a tripping circuit, characterized in that: It also includes monitoring relays, PLC control modules and switch control modules; The opening circuit includes a positive electrode of a control power supply, a manual opening switch, a normally open contact of a circuit breaker body, a circuit breaker opening coil and a negative electrode of a control power supply connected in sequence; one end of the monitoring relay is connected to the positive electrode of the control power supply, and the other end is connected to the normally open contact of the circuit breaker body; The input end of the PLC control module is respectively connected to the manual opening switch, the normally open contact of the circuit breaker body, and the output end of the monitoring relay, and the output end of the PLC control module is connected to the input end of the switch control module.

2. The device according to claim 1, characterized in that It also includes anti-trip relays and anti-trip resistors; One end of the normally open contact of the anti-tripping relay is connected to the positive electrode of the control power supply, and the other end is connected to the anti-tripping resistor, the current starting coil of the anti-tripping relay, and the normally open contact of the circuit breaker body in sequence.

3. The device according to claim 1, characterized in that It also includes a protection relay; one end of the normally open contact of the protection relay is connected to the positive electrode of the control power supply, and the other end is connected to the current holding coil of the protection relay and the normally open contact of the circuit breaker body in sequence; The output end of the protection relay is connected to the input end of the PLC control module.

4. The device according to claim 1, characterized in that It also includes a DCS opening module; one end of the DCS opening module is connected to the positive electrode of the control power supply, and the other end is connected to the normally open contact of the circuit breaker body; The output end of the DCS opening module is connected to the input end of the PLC control module.

5. The device according to claim 1, characterized in that The switch control module includes a switch controller and a controller power supply; The controller power supply is connected to the switch controller; the input end of the switch controller is connected to the output end of the PLC control module to receive the closing instruction of the PLC control module and control the closing of the manual opening switch.

6. The device according to claim 1, characterized in that It also includes a circuit breaker switch cabinet, and the control power supply, the opening circuit, and the monitoring relay are all arranged inside the circuit breaker switch cabinet.

7. The device according to claim 6, characterized in that The switch control module is fixed on the inner side of the door of the circuit breaker switch cabinet and is arranged opposite to the manual opening switch.

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