Circuit breaker

Abstract

The invention relates to the field of circuit breakers, and provides a circuit breaker which comprises an insulating shell and a pull rod mechanism, a power connection end is arranged on the side face of the insulating shell, the circuit breaker further comprises a first capacitor and a second capacitor, and the first capacitor is arranged in the insulating shell and electrically connected with a first conductive metal body of the power connection end; the second capacitor is arranged in the insulating shell, a second conductive metal body electrically connected with the second capacitor is arranged at the end part of a moving contact of the vacuum arc-extinguishing chamber of the insulating shell, and a first interface and a second interface are arranged on the side wall or the end part of the insulating shell. The circuit breaker is connected for use, and the power connection end is connected with external detection or feedback equipment, so that the working state of the circuit breaker is monitored and fed back in real time. When the circuit breaker is disconnected, the first capacitor and the second capacitor can be used for detection so as to determine whether the interior of the circuit breaker is completely powered off, that is, no residual voltage exists on the power connection end and the moving contact part, so that safe and reliable operation is ensured.

Description

Technical Field

[0001] This invention relates to the field of circuit breakers, and more specifically to a circuit breaker. Background Technology

[0002] High-voltage vacuum circuit breakers are named for their high-vacuum nature, which is both the arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. They are widely used in power distribution networks due to their advantages of small size, light weight, suitability for frequent operation, and maintenance-free arc extinguishing. The working principle of a vacuum circuit breaker is as follows: When the moving and stationary contacts open under the action of the operating mechanism, an electric arc is generated between the contacts. Vapor evaporates from the contact surface at high temperature. Due to the special shape of the contacts, a magnetic field is generated when current passes through. Under the influence of this magnetic field, the arc moves rapidly along the tangential direction of the contact surface, and some metal vapor condenses on the metal cylinder (shielding cover). The arc extinguishes when it naturally crosses zero, and the dielectric strength between the contacts quickly recovers.

[0003] After a vacuum circuit breaker is switched on or off, current will remain inside the circuit breaker for a certain period of time. If the voltage inside the circuit breaker cannot be determined, this poses a serious safety hazard to operators or maintenance personnel. Summary of the Invention

[0004] The purpose of this invention is to provide a circuit breaker that addresses the problem that existing circuit breakers do not have the ability to obtain internal voltage information.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a circuit breaker, comprising an insulating housing and a pull rod mechanism for performing on / off operations on the circuit breaker, wherein the side of the insulating housing is provided with a terminal for connecting to another circuit breaker, and further comprising:

[0006] A first capacitor, disposed within the insulating housing and electrically connected to a first conductive metal body at the terminal; and

[0007] The second capacitor is disposed inside the insulating housing, and the moving contact end of the vacuum interrupter chamber of the insulating housing is provided with a second conductive metal body electrically connected to the second capacitor;

[0008] The insulating housing has a first interface electrically connected to the first capacitor and a second interface electrically connected to the second capacitor on its side wall or end.

[0009] In a preferred embodiment of the present invention, the first capacitor and the second capacitor are disposed within the side wall of the pull rod cavity of the insulating housing.

[0010] As a preferred structure of the present invention, the ratio of the diameter or the width of the cross-section of the first capacitor to the thickness at the location of the insulating shell is 1:(2.23 to 4.57).

[0011] As a preferred structure of the present invention, the ratio of the diameter or the width of the cross-section of the second capacitor to the thickness at the location of the insulating shell is 1:(2.23 to 4.57).

[0012] As a preferred structure of the present invention, a feedback device is also provided, which is electrically connected to the first interface and the second interface;

[0013] The feedback device includes a wireless communication module for electrical connection with an external terminal, a processing module for converting electrical signals on a capacitor into data information, and a storage module for recording data information and forming a database.

[0014] As a preferred structure of the present invention, the first capacitor, the second capacitor and the insulating shell are integrally cast from insulating material.

[0015] As a preferred structure of the present invention, the first capacitor and the second capacitor are high-voltage capacitors for capacitor power extraction, carrier coupling and voltage traveling wave acquisition, and the capacitance value ranges from 3000pF to 8000pF.

[0016] As a preferred structure of the present invention, a third capacitor is provided inside the insulating housing, a third conductive metal body electrically connected to the third capacitor is provided on the stationary contact of the insulating housing, and a third interface electrically connected to the third capacitor is provided on the side wall or end of the insulating housing.

[0017] As a preferred structure of the present invention, the insulating shell is provided with shielding mesh at the first capacitor, the second capacitor and the third capacitor.

[0018] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0019] 1. This invention connects and uses a circuit breaker, and simultaneously connects it to an external detection or feedback device via a power terminal to achieve real-time monitoring and feedback of the circuit breaker's operating status. When the circuit breaker is disconnected, a first capacitor and a second capacitor can be used for detection to determine whether the circuit breaker is completely de-energized, i.e., there is no residual voltage on the power terminal and moving contact, to ensure safe and reliable operation. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the circuit breaker described in this invention;

[0021] Figure 2 This is a cross-sectional view of the circuit breaker described in this invention connected to another switch circuit breaker.

[0022] Figure 3This is a block diagram of the circuit breaker described in this invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Insulating housing; 11. Pull rod mechanism; 12. Electrical connection terminal;

[0025] 101. First conductive metal body; 102. Second conductive metal body; 103. First interface; 104. Second interface; 105. Third conductive metal body; 106. Third interface; 107. Shielding mesh;

[0026] 20. First capacitor; 30. Second capacitor;

[0027] 40. Feedback device; 401. Wireless communication module; 402. Processing module; 403. Storage module;

[0028] 50. The third capacitor. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element of the present invention must have a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0032] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Please refer to Figure 1 and Figure 2As shown, this embodiment provides a circuit breaker, including an insulating housing 10 and a lever mechanism 11 for performing on / off operations on the circuit breaker. The insulating housing 10 has a side terminal 12 for connecting to another circuit breaker. It also includes a first capacitor 20 and a second capacitor 30. The first capacitor 20 is disposed within the insulating housing 10 and electrically connected to a first conductive metal body 101 of the side terminal 12. The second capacitor 30 is disposed within the insulating housing 10. A second conductive metal body 102 electrically connected to the second capacitor 30 is provided at the moving contact end of the vacuum interrupter chamber of the insulating housing 10. A first interface 103 electrically connected to the first capacitor 20 and a second interface 104 electrically connected to the second capacitor 30 are provided on the sidewall or end of the insulating housing 10. The first capacitor 20, the second capacitor 30, and the insulating housing 10 are integrally cast from an insulating material (e.g., epoxy resin).

[0034] The first conductive metal body 101, the second conductive metal body 102, and the third conductive metal body 105 of this disclosure are all made of highly conductive metal materials, such as copper or copper alloys, to ensure the stability and reliability of the circuit. The insulating shell 10 can be made of epoxy resin, which has good insulation properties and mechanical strength, effectively isolating internal components from the external environment and improving the safety and durability of the circuit breaker.

[0035] The first interface 103, the second interface 104, and the third interface 106 of this disclosure can be disposed on the end face of the insulating housing 10 to form a pluggable interface; or, they can be directly connected to the power cord and external equipment for quick connection and disconnection with other circuit breakers or circuit systems.

[0036] Furthermore, the moving and stationary contacts within the vacuum interrupter can rapidly release arc energy during the breaking process. Through coupling between the second conductive metal body 102 and the second capacitor 30 at the end of the moving contact, arc energy is absorbed and buffered, thereby improving the circuit breaker's breaking capacity and service life. Simultaneously, by connecting the first interface 103 and the second interface 104, the internal operating status of the circuit breaker can be detected to determine whether the circuit breaker is energized after switching on and off, ensuring operator safety.

[0037] In addition, by detecting the voltage changes of the first capacitor 20 and the second capacitor 30, the current state inside the circuit breaker can be determined in real time, ensuring that no residual current flows through when the circuit is open, thereby effectively preventing the risk of leakage.

[0038] In use, the circuit breaker is connected and connected to an external detection or feedback device via the energizing terminal 12 to achieve real-time monitoring and feedback of the circuit breaker's operating status. When the circuit breaker is disconnected, the first capacitor 20 and the second capacitor 30 can be used to detect whether the circuit breaker is completely de-energized, i.e., there is no residual voltage on the energizing terminal 12 and the moving contact, to ensure safe and reliable operation.

[0039] In practical applications, this circuit breaker, by rationally configuring the capacitance of the first capacitor 20 and the second capacitor 30, can effectively absorb transient overvoltages generated during the breaking process, thereby reducing the impact on the circuit system. For example, multiple capacitors of the same type can be connected in series as needed to improve the overall withstand voltage and stability. At the same time, the parallel combination of multiple capacitors can also effectively reduce the impact of the failure of a single capacitor on the overall performance, thereby further enhancing the reliability of the system.

[0040] like Figure 1 and Figure 2 As shown, in this disclosure, the first capacitor 20 and the second capacitor 30 are disposed inside the side wall of the pull rod cavity of the insulating housing 10, which can be disposed away from the vacuum interrupter, thereby reducing the influence of the electric field on the capacitor and ensuring the stability and safety of the capacitor operation.

[0041] Furthermore, the first capacitor 20 and the second capacitor 30 of this disclosure are high-voltage capacitors for capacitor power extraction, carrier coupling and voltage traveling wave acquisition, and the capacitance value ranges from 3000pF to 8000pF.

[0042] In this disclosure, the ratio of the diameter or cross-sectional width of the first capacitor 20 to the thickness at the location of the insulating housing 10 is 1:(2.23 to 4.57), preferably 1:3. Similarly, the ratio of the diameter or cross-sectional width of the second capacitor 30 to the thickness at the location of the insulating housing 10 is 1:(2.23 to 4.57), preferably 1:3.

[0043] Specifically, the capacitor can be placed in the middle to ensure it is not directly affected by external interference. Alternatively, it can be placed on the outer side, with the distance between the capacitor and the outer side being less than the distance between the capacitor and the inner side. For example, the distance between the capacitor and the outer side should be half the distance between the capacitor and the inner side to reduce electromagnetic interference inside the circuit breaker.

[0044] like Figure 3As shown, this disclosure also includes a feedback device 40, which is electrically connected to the first interface 103 and the second interface 104. The feedback device 40 includes a wireless communication module 401 for electrical connection with an external terminal, a processing module 402 for converting electrical signals on the capacitor into data information, and a storage module 403 for recording data information and forming a database. The storage module 403 can be an external hard disk and / or cache chip. The processing module 402 can be a CPU, MCU, or DSP chip, used to process and analyze the acquired voltage signals, and transmit the analysis results to an external monitoring terminal through the wireless communication module 401, thereby realizing remote monitoring and fault early warning of the circuit breaker's operating status.

[0045] Specifically, the wireless communication module 401 can use wireless transmission methods such as Bluetooth, Wi-Fi, or 4G / 5G to achieve remote communication with external terminals (such as mobile phones or computers). Through the wireless communication module 401, users can obtain real-time operating status information of the circuit breaker, including key parameters such as capacitor voltage, current, and temperature, based on the data information processed by the processing module 402. This enables comprehensive monitoring and intelligent diagnosis of the circuit breaker's operating status. Simultaneously, abnormal warnings can be issued by setting thresholds to ensure stable operation of the equipment under complex conditions. Furthermore, the storage module 403 in the feedback device 40 is used to store historical data and operating logs, facilitating subsequent data analysis and fault tracing. Meanwhile, the processing module 402 in the feedback device 40 can filter, amplify, and digitize the collected electrical signals to improve data accuracy and reliability.

[0046] like Figure 2 As shown, the insulating housing 10 of this disclosure is provided with a third capacitor 50, and a third conductive metal body 105 electrically connected to the third capacitor 50 is provided on the stationary contact of the insulating housing 10. A third interface 106 electrically connected to the third capacitor 50 is provided on the side wall or end of the insulating housing 10.

[0047] The setting of the third capacitor 50 is the same as that of the first capacitor 20 or the second capacitor 30. It can monitor the electrical connection position of the stationary contact of the circuit breaker, thereby realizing real-time feedback and control of the operating status of the main circuit of the circuit breaker. For detailed explanation, please refer to the description of the first capacitor 20 and the second capacitor 30, which will not be repeated here.

[0048] like Figure 2As shown, the insulating housing 10 of this disclosure is provided with shielding meshes 107 at the first capacitor 20, the second capacitor 30, and the third capacitor 50. The shielding meshes 107 can block electromagnetic interference between the capacitors and the outside of the circuit breaker, thereby effectively improving the accuracy and stability of the capacitor-acquired signals. The shielding meshes 107 can be made of conductive material and reliably connected to the grounding terminal of the circuit breaker to form an effective electromagnetic shielding environment. In specific embodiments, the shielding meshes 107 can be arranged around the outside of the capacitors or embedded inside the insulating housing 10, maintaining a certain distance from the capacitors to avoid direct contact that could affect the normal operation of the capacitors. By setting the shielding meshes 107, interference from external electromagnetic fields on the capacitors can be effectively suppressed, further improving the overall electromagnetic compatibility of the circuit breaker and ensuring its stable operation in complex electromagnetic environments.

[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A circuit breaker comprising an insulating housing and a pull rod mechanism for conducting on or off operation of the circuit breaker, a side surface of the insulating housing being provided with a power connection terminal for connection with another circuit breaker, characterized in that, Also comprising: a first capacitor disposed in the insulating shell and electrically connected with the first conductive metal body of the electric terminal; and a second capacitor disposed in the insulating shell, the moving contact end of the vacuum arc-extinguishing chamber of the insulating shell being provided with a second conductive metal body electrically connected with the second capacitor; the side wall or end of the insulating shell being provided with a first interface electrically connected with the first capacitor and a second interface electrically connected with the second capacitor.

2. The circuit breaker of claim 1, wherein: The first capacitor and the second capacitor are disposed in the side wall of the pull rod cavity of the insulating shell.

3. The circuit breaker of claim 1, wherein: The ratio of the diameter or cross-sectional width of the first capacitor to the thickness of the insulating shell at the location of the first capacitor is 1:(2.23-4.57).

4. The circuit breaker of claim 1, wherein: The ratio of the diameter or cross-sectional width of the second capacitor to the thickness of the insulating shell at the location of the second capacitor is 1:(2.23-4.57).

5. The circuit breaker of claim 1, wherein, A feedback device is also provided, which is electrically connected with the first interface and the second interface; The feedback device comprises a wireless communication module for electrical connection with an external terminal, a processing module for converting electrical signals on the capacitor into data information, and a storage module for recording data information and forming a database.

6. The circuit breaker of claim 1, wherein, The first capacitor, the second capacitor and the insulating shell are integrally casted using insulating material.

7. The circuit breaker of claim 1, wherein, The first capacitor and the second capacitor are high-voltage capacitors for capacitor power taking, carrier coupling and voltage traveling wave collection, and the capacitance value ranges from 3000pF to 8000pF.

8. The circuit breaker of claim 1, wherein, A third capacitor is disposed in the insulating shell, a third conductive metal body is disposed on the static contact of the insulating shell and electrically connected with the third capacitor, and a third interface is disposed on the side wall or end of the insulating shell and electrically connected with the third capacitor.

9. The circuit breaker of claim 8, wherein, The insulating shell is provided with a shielding net at the first capacitor, the second capacitor and the third capacitor.

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