Open circuit prevention circuit of circuit breaker
By connecting a transient suppression diode in series with the current transformer circuit of the circuit breaker, the open-circuit discharge phenomenon at the socket is solved, protecting the circuit breaker controller and preventing damage.
Patent Information
- Application Number
- CN202423121542.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In the electronic control system of circuit breakers, when the current sampling transformer is connected to the circuit breaker controller, an open-circuit discharge phenomenon is prone to occur at the socket, which can lead to damage to the controller.
A transient suppression diode is connected in series in the circuit of the current transformer to prevent the generation of open circuit current during insertion and removal. The open circuit protection circuit of the zero-sequence current transformer, the open circuit protection circuit of the protection transformer, and the open circuit protection circuit of the measurement transformer are used to suppress the open circuit current through rectifier diodes and transient suppression diodes, respectively.
This effectively prevents open-circuit discharge of the controller module during hot-plugging, protecting the controller from damage.
Smart Images
Figure CN223625580U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of control system technology for molded case circuit breakers, and in particular to the anti-open circuit circuit of the circuit breaker. Background Technology
[0002] In the electronic control system of circuit breakers, current sampling transformers, such as current transformers, measuring transformers, and zero-sequence current transformers, are often used. These sampling signals are collected on a converter socket and connected to the circuit breaker controller. However, during the connection of the two ports, an open-circuit discharge phenomenon occurs at the socket, which burns out the controller. Summary of the Invention
[0003] The purpose of this invention is to provide an anti-open circuit circuit for a circuit breaker to solve the above-mentioned technical problems.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] An anti-open-circuit circuit for a circuit breaker, characterized in that it includes a circuit breaker controller and at least one anti-open-circuit circuit for a current transformer, wherein the circuit breaker controller is connected to the anti-open-circuit circuit for the current transformer via an adapter socket, and the anti-open-circuit circuit for the current transformer is a zero-sequence current transformer anti-open-circuit circuit and / or a measuring current transformer anti-open-circuit circuit and / or a protective current transformer anti-open-circuit circuit.
[0006] The present invention further includes an adapter socket J4, a rectifier diode D3, a rectifier diode D4, a rectifier diode D7, and a rectifier diode D8. The adapter socket J4 has a connecting pin 1, a connecting pin 2, and a connecting pin 3. The connecting pin 1 connects to the rectifier diode D4 and the rectifier diode D3. The rectifier diode D4 is connected to the rectifier diode D8 and then to the connecting pin 3. The rectifier diode D3 is connected to the rectifier diode D7 and then to the connecting pin 3.
[0007] The present invention further includes a protection circuit for the current transformer against open circuit, comprising an adapter socket J3 and three transient suppression diodes. The three transient suppression diodes are located on the three-phase circuit, and the transient suppression diodes include diodes D1, D5, and D9. The two ends of diode D1 are connected to pins 1 and 2 of the adapter socket J3, the two ends of diode D5 are connected to pins 3 and 4 of the adapter socket J3, and diode D9 is connected to pins 5 and 6 of the adapter socket J3.
[0008] The present invention further includes an open-circuit protection circuit for the measuring transformer, comprising an adapter socket J2 and three transient suppression diodes. The three transient suppression diodes are located on the three-phase circuit, and include diodes D2, D6, and D10. The two ends of diode D2 are connected to pins 1 and 2 of adapter socket J2, the two ends of diode D6 are connected to pins 3 and 4 of adapter socket J2, and diode D10 is connected to pins 5 and 6 of adapter socket J2.
[0009] The beneficial effects of this invention are as follows: In the circuit of the current transformer, an SMBJ6.0CA transient suppression diode is connected in series in each phase circuit to suppress the open-circuit current generated during insertion and removal, thereby achieving the function of preventing open circuit and avoiding open-circuit discharge during hot-plugging of the controller module. In the circuit of the current transformer protection, an SMBJ30CA transient suppression diode is connected in series in each phase circuit to suppress the open-circuit current generated during insertion and removal, thereby achieving the function of preventing open circuit and avoiding open-circuit discharge during hot-plugging of the controller module. In the circuit of the zero-sequence current transformer, an A7 rectifier diode is connected in series in the circuit to suppress the open-circuit current generated during insertion and removal, thereby achieving the function of preventing open circuit and avoiding open-circuit discharge during hot-plugging of the controller module. Attached Figure Description
[0010] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0011] Figure 1 This is a schematic diagram of the controller of this utility model.
[0012] Figure 2 This is a circuit diagram for preventing open circuit of the zero-sequence current transformer in an embodiment of this utility model.
[0013] Figure 3 This is a circuit diagram for protecting the current transformer from open circuit in an embodiment of this utility model.
[0014] Figure 4 This is a circuit diagram for preventing open circuit of the current transformer in an embodiment of this utility model. Detailed Implementation
[0015] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.
[0016] like Figure 1-4As shown, this utility model provides an anti-open-circuit circuit for a circuit breaker, including a circuit breaker controller and at least one anti-open-circuit circuit for a current transformer. The circuit breaker controller is connected to the anti-open-circuit circuit for the current transformer via an adapter socket. The anti-open-circuit circuit for the current transformer is a zero-sequence current transformer anti-open-circuit circuit and / or a measuring current transformer anti-open-circuit circuit and / or a protective current transformer anti-open-circuit circuit.
[0017] refer to Figure 2 The zero-sequence current transformer anti-open-circuit circuit includes an adapter socket J4, rectifier diodes D3, D4, D7, and D8. The adapter socket J4 has a connection pin 1, a connection pin 2, and a connection pin 3. The connection pin 1 connects to rectifier diodes D4 and D3. The rectifier diode D4 is connected to rectifier diode D8 and then to connection pin 3. The rectifier diode D3 is connected to rectifier diode D7 and then to connection pin 3.
[0018] refer to Figure 3 The protection circuit for the current transformer against open circuit includes an adapter socket J3 and three transient suppression diodes. The three transient suppression diodes are located on the three-phase circuit. The transient suppression diodes include diodes D1, D5, and D9. The two ends of diode D1 are connected to pins 1 and 2 of the adapter socket J3. The two ends of diode D5 are connected to pins 3 and 4 of the adapter socket J3. Diode D9 is connected to pins 5 and 6 of the adapter socket J3.
[0019] refer to Figure 4 The open-circuit protection circuit for the current transformer includes an adapter socket J2 and three transient suppression diodes. The three transient suppression diodes are located on the three-phase circuit. The transient suppression diodes include diode D2, diode D6 and diode D10. The two ends of diode D2 are connected to pins 1 and 2 of adapter socket J2. The two ends of diode D6 are connected to pins 3 and 4 of adapter socket J2. Diode D10 is connected to pins 5 and 6 of adapter socket J2.
[0020] In this invention, an SMBJ6.0CA transient suppression diode is connected in series in each phase circuit of the current transformer measuring circuit to suppress the open-circuit current generated during insertion and removal, thereby achieving the function of preventing open circuit and avoiding open-circuit discharge during the hot-plugging and removal of the controller module. Similarly, an SMBJ30CA transient suppression diode is connected in series in each phase circuit of the current transformer protection circuit to suppress the open-circuit current generated during insertion and removal, thus achieving the function of preventing open circuit and avoiding open-circuit discharge during the hot-plugging and removal of the controller module. Finally, an A7 rectifier diode is connected in series in the circuit of the zero-sequence current transformer to suppress the open-circuit current generated during insertion and removal, thus achieving the function of preventing open circuit and avoiding open-circuit discharge during the hot-plugging and removal of the controller module.
[0021] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.
[0022] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.
[0023] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept by means of the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.
Claims
1. An anti-open-circuit circuit for a circuit breaker, characterized in that, It includes a circuit breaker controller and at least one transformer open-circuit protection circuit. The circuit breaker controller is connected to the transformer open-circuit protection circuit via an adapter socket. The transformer open-circuit protection circuit is a zero-sequence current transformer open-circuit protection circuit and / or a measuring transformer open-circuit protection circuit and / or a protective transformer open-circuit protection circuit.
2. The anti-open-circuit circuit of a circuit breaker according to claim 1, characterized in that, The zero-sequence current transformer anti-open-circuit circuit includes an adapter socket J4, rectifier diodes D3, D4, D7, and D8. The adapter socket J4 has connection pins 1, 2, and 3. Connection pin 1 connects to rectifier diodes D4 and D3. Rectifier diode D4 is connected to rectifier diode D8 and then to connection pin 3. Rectifier diode D3 is connected to rectifier diode D7 and then to connection pin 3.
3. The anti-open-circuit circuit of a circuit breaker according to claim 1, characterized in that, The protection circuit for the current transformer against open circuit includes an adapter socket J3 and three transient suppression diodes. The three transient suppression diodes are located on the three-phase circuit. The transient suppression diodes include diodes D1, D5, and D9. The two ends of diode D1 are connected to pins 1 and 2 of the adapter socket J3. The two ends of diode D5 are connected to pins 3 and 4 of the adapter socket J3. Diode D9 is connected to pins 5 and 6 of the adapter socket J3.
4. The anti-open-circuit circuit of a circuit breaker according to claim 1, characterized in that, The open-circuit protection circuit for the current transformer includes an adapter socket J2 and three transient suppression diodes. The three transient suppression diodes are located on the three-phase circuit. The transient suppression diodes include diodes D2, D6, and D10. The two ends of diode D2 are connected to pins 1 and 2 of adapter socket J2. The two ends of diode D6 are connected to pins 3 and 4 of adapter socket J2. Diode D10 is connected to pins 5 and 6 of adapter socket J2.