Solid-sealed polar pole for magnetically controlled circuit breaker

Abstract

The utility model relates to the technical field of solid-sealed polar poles, and discloses a solid-sealed polar pole for a magnetically controlled circuit breaker, which comprises an outdoor epoxy shell, the top end of the outdoor epoxy shell is fixedly connected with a wire inlet terminal, the bottom of the wire inlet terminal is provided with a vacuum arc-extinguishing chamber, the wire inlet end of the vacuum arc-extinguishing chamber is provided with an extended copper conductive rod, and the wire inlet terminal of the vacuum arc-extinguishing chamber is fixedly connected with the outdoor epoxy shell. The movable end of the vacuum arc-extinguishing chamber is fixedly connected with a flexible connector, an insulating pull rod is fixedly connected below the flexible connector, a wire inlet side voltage sensor is installed on the middle lower portion of the rear end of the inner side of the outdoor epoxy shell, and a low-power-consumption phase current sensor and a zero-sequence current sensor are installed on the wire outlet side. A current transformer is installed in the outdoor epoxy shell. According to the utility model, a low-contact-pressure vacuum arc-extinguishing chamber scheme is adopted, and the low-contact-pressure scheme can effectively prolong the service life of the contact and increase the opening speed, so that the special function of rapid opening is achieved.

Description

A solid-sealed pole for a magnetically controlled circuit breaker Technical Field

[0001] This utility model relates to the field of solid-sealed pole technology, and in particular to a solid-sealed pole for magnetically controlled circuit breakers. Background Technology

[0002] Solid-sealed poles are integral components that embed vacuum interrupters and related conductive parts of circuit breakers into solidified insulating materials. Solid-sealed poles encapsulate conductive parts in insulating materials, realizing the transformation from surface insulation to volume insulation. Compared with traditional air insulation, their insulation performance is less affected by environmental factors and can maintain a good insulation state under harsh environmental conditions, thereby improving the reliability and safety of electrical equipment.

[0003] A search revealed Chinese Patent Publication No. CN112185752B, which discloses a solid-sealed pole, comprising: a housing, a vacuum interrupter, an outgoing conductive rod, a current sensor / current transformer, a first voltage sensor, a second voltage sensor, an insulating pull rod assembly, an electrical connection assembly, and a shielding assembly. The current sensor / current transformer is coaxial with the outgoing conductive rod to monitor the current signal. The first and second voltage sensors are respectively disposed at the moving and stationary ends of the vacuum interrupter to monitor the voltage signals on both sides of the vacuum interrupter's break. The shielding assembly is disposed on the outer periphery of the vacuum interrupter and / or the outgoing conductive rod to shield the signal interference to the first voltage sensor, the second voltage sensor, and / or the current sensor / current transformer. By setting the shielding assembly, the influence of the current sensor / current transformer on the electric field of the upper conductive part of the insulating pull rod is reduced, and the influence of the large electric field of the voltage sensor in the vacuum interrupter's open state on the partial discharge of the solid-sealed pole is also reduced, thus improving the insulation strength. Summary of the Invention

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a solid-sealed pole for a magnetically controlled circuit breaker, comprising an outdoor epoxy shell, an incoming terminal fixedly connected to the top of the outdoor epoxy shell, a vacuum interrupter provided at the bottom of the incoming terminal, an outgoing copper conductive rod around the periphery of the vacuum interrupter, a flexible connection fixedly connected to the moving end of the vacuum interrupter, an insulating pull rod fixedly connected below the flexible connection, an incoming voltage sensor installed in the lower middle part of the inner rear end of the outdoor epoxy shell, a phase current sensor and a zero-sequence current sensor installed on the outgoing side of the outdoor epoxy shell, a current transformer installed inside the outdoor epoxy shell, a voltage equalization shielding ring provided between the current transformer and the vacuum interrupter, an outgoing terminal fixedly connected to the front end of the outdoor epoxy shell, an outgoing high-voltage capacitor low-voltage terminal installed on the inner bottom wall of the outdoor epoxy shell, an incoming high-voltage capacitor low-voltage terminal installed on the inner bottom wall of the outdoor epoxy shell, and a secondary outgoing terminal of the current transformer installed on the inner bottom wall of the outdoor epoxy shell.

[0005] The above technical solution integrates an outgoing voltage sensor and a voltage equalization shielding ring within the outdoor epoxy shell. The sealed electrode post achieves dual-sided voltage signal sampling via voltage sensors on both the incoming and outgoing terminals, and can also sample voltage signals from one side as needed. The voltage equalization shielding ring of the outgoing voltage sensor provides a uniform electric field, reducing the overall partial discharge value of the electrode post. The phase current sensor and zero-sequence current sensor utilize low-power coils, with independent coils for phase current and zero-sequence current. The insulated pull rod is rigidly connected to the outgoing copper conductive rod, eliminating the need for an internal spring and thus reducing the burden on the vacuum interrupter and moving parts. The weight of all incoming high-voltage capacitors is reduced, and the low-voltage terminals of all incoming high-voltage capacitors are led out to the bottom of the solid-sealed pole through the low-voltage terminals of outgoing high-voltage capacitors. The low-voltage terminals of outgoing high-voltage capacitors are installed by thread, which simplifies the installation process and wiring steps. The specially designed vacuum interrupter uses a low contact pressure scheme. First, it can reduce the contact pressure, thereby reducing the holding force of the magnetic control mechanism and increasing the residual holding force of the mechanism. Second, the specially designed vacuum interrupter can enable the switch to achieve a faster opening speed, enabling it to achieve the special function of rapid opening. At the same time, the low contact pressure can also greatly increase the life of the vacuum interrupter.

[0006] As a further description of the above technical solution:

[0007] The bottom of the outdoor epoxy shell is fixedly connected to a base. Multiple terminals for incoming voltage sensors are equidistantly provided on the bottom of the outer wall of the base. An assembly seal is fixedly connected to the outer wall of the terminals for the incoming voltage sensors. The assembly seal is used to seal the solid electrode.

[0008] The above technical solution, through the assembly seal on the outer wall of the incoming voltage sensor at the bottom of the base, ensures that when connecting components are connected via the incoming voltage sensor, the assembly seal can fit tightly against the outer wall of the connection point. This effectively prevents impurities and dirt from the surrounding environment from entering the solid-sealed pole and causing contamination. Even under various complex working environments, the assembly seal can maintain good sealing performance to ensure the stable operation of the entire system, thus avoiding the problem of equipment damage caused by external dirt entering the equipment connection.

[0009] As a further description of the above technical solution:

[0010] An incoming voltage sensor is fixedly connected to the rear side of the outer wall of the outdoor epoxy shell.

[0011] Through the above technical solution, the incoming line voltage sensor can monitor the incoming line voltage of outdoor electrical equipment in real time. Through continuous monitoring, it can promptly detect voltage fluctuations, abnormal increases and decreases, providing important voltage data references for the stable operation of the equipment, so that staff can take timely measures when voltage problems occur.

[0012] As a further description of the above technical solution:

[0013] A primary wiring terminal is installed on the outer wall of the incoming terminal.

[0014] Through the above technical solution, the primary terminal block provides a clear and convenient interface for connecting the external circuit to the incoming terminal block, which facilitates the access and fixation of wires and improves the efficiency and accuracy of wiring.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, the solid-sealed pole can achieve dual-sided sampling of voltage signals through voltage sensors on the input and output terminals. The specially designed output vacuum interrupter uses a low contact pressure scheme, which extends its service life while maintaining excellent mechanical characteristics such as high opening speed. The low-voltage terminal of the output high-voltage capacitor is installed by thread, which simplifies the installation process and wiring steps, making subsequent maintenance and replacement more convenient.

[0017] 2. In this utility model, the sealing ring on the outer wall of the incoming voltage sensor at the bottom of the base ensures that when the connecting parts are connected through the incoming voltage sensor, the sealing ring can fit tightly against the outer wall of the connection part. This effectively prevents impurities and dirt from the surrounding environment from entering the solid-sealed pole and causing contamination. Even under various complex working environments, the sealing ring can always maintain good sealing performance to ensure the stable operation of the entire system, thereby avoiding the problem of equipment damage caused by external dirt entering the equipment connection. Attached Figure Description

[0018] Figure 1 is a perspective view of a solid-sealed pole for a magnetically controlled circuit breaker proposed in this utility model;

[0019] Figure 2 is a left-side sectional view of a solid-sealed pole for a magnetically controlled circuit breaker proposed in this utility model;

[0020] Figure 3 is a top view of a solid-sealed pole for a magnetically controlled circuit breaker proposed in this utility model;

[0021] Figure 4 is a side view of a solid-sealed pole for a magnetically controlled circuit breaker proposed in this utility model;

[0022] Figure 5 is a right-side sectional view of a solid-sealed pole for a magnetically controlled circuit breaker proposed in this utility model.

[0023] Legend:

[0024] 1. Outdoor epoxy shell; 2. Incoming voltage sensor; 3. Incoming terminal; 4. Outgoing copper conductive rod; 5. Insulating pull rod; 6. Flexible connection; 7. Outgoing voltage sensor; 8. Phase current sensor and zero-sequence current sensor; 9. Outgoing terminal; 10. Incoming high voltage capacitor low voltage terminal; 11. Outgoing high voltage capacitor low voltage terminal; 12. Equalizing shielding ring; 13. Vacuum interrupter; 14. Assembly sealing groove; 15. Base; 16. Pole post fixing insert; 17. Fixing bolt. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Referring to Figures 1, 3, and 5, one embodiment of this utility model is provided: a solid-sealed pole for a magnetically controlled circuit breaker, comprising an outdoor epoxy shell 1, an incoming terminal 3 fixedly connected to the top of the outdoor epoxy shell 1, a vacuum interrupter 13 disposed at the bottom of the incoming terminal 3, an outgoing copper conductive rod 4 surrounding the vacuum interrupter 13, a flexible connector 6 fixedly connected to the moving end of the vacuum interrupter 13, an insulating pull rod 5 fixedly connected below the flexible connector 6, an incoming voltage sensor 7 installed in the lower middle part of the inner rear end of the outdoor epoxy shell 1, a phase current sensor and a zero-sequence current sensor 8 installed on the outgoing side of the outdoor epoxy shell 1, a current transformer installed inside the outdoor epoxy shell, and an equalizing shielding ring 12 disposed between the current transformer and the vacuum interrupter 13. The front end of the outer epoxy housing 1 is fixedly connected to the outgoing terminal 9. The inner bottom wall of the outdoor epoxy housing 1 is provided with the outgoing high voltage capacitor low voltage terminal 11. The inner bottom wall of the outdoor epoxy housing 1 is installed with the incoming high voltage capacitor low voltage terminal 10. The inner bottom wall of the outdoor epoxy housing 1 is installed with the secondary outgoing terminal of the current transformer. The outer rear side of the outdoor epoxy housing 1 is fixedly connected with the terminal of the incoming voltage sensor. The terminal of the incoming voltage sensor can monitor the voltage signal of the outdoor pole-mounted circuit breaker in real time and feed it back to the FTU device for fault judgment and corresponding control. The outer wall of the incoming terminal 3 is installed with the primary terminal. The primary terminal provides a clear and convenient interface for the connection between the external circuit and the incoming terminal 3, which can facilitate the access and fixation of wires.

[0027] Specifically, the outgoing voltage sensor 7 and the equalizing shielding ring 12 are integrated inside the outdoor epoxy shell 1. The solid-sealed pole can achieve dual-sided sampling of the voltage signal through the incoming voltage sensor 2 and the outgoing voltage sensor 7. Alternatively, single-sided voltage sampling can be achieved using either the incoming or outgoing side as needed. The equalizing shielding ring 12 is used on the connection side between the outgoing voltage sensor 7 and the vacuum interrupter and the software connection side, which can effectively shield the electric field, reduce the risk of partial discharge, extend the service life of the solid-sealed pole, and make it less prone to breakdown. The phase current sensor and the zero-sequence current sensor 8 use low-power coils, and both the phase current and the zero-sequence current use independent low-power current transformer coils. The insulating pull rod 5 and the outgoing copper conductive rod 4 are connected to the ingoing voltage sensor 7. The circuit breaker features a rigid connection without an internal spring, reducing the weight of the insulating pull rod. All incoming high-voltage capacitor low-voltage terminals 10 and outgoing high-voltage capacitor low-voltage terminals 11 are led out to the bottom of the solid-sealed pole. The outgoing high-voltage capacitor low-voltage terminals 11 are threaded, simplifying the installation process and wiring steps. The specially designed vacuum interrupter 13 uses a low contact pressure scheme, extending its service life while maintaining excellent mechanical characteristics such as opening speed. The outer wall of the outdoor epoxy housing 1 is fixedly connected to the terminal block of the incoming voltage sensor. The terminal block of the incoming voltage sensor can monitor the voltage signal of the outdoor pole-mounted circuit breaker in real time and feed it back to the FTU device for fault diagnosis and corresponding control. The outer wall of the incoming terminal 3 is equipped with a primary terminal block, which provides a clear and convenient interface for the connection between the external circuit and the incoming terminal 3, facilitating wire access and fixation, and improving wiring efficiency and accuracy.

[0028] Referring to Figures 3 and 4, a base 15 is fixedly connected to the bottom of the outdoor epoxy housing 1. Multiple terminals for incoming voltage sensors are equidistantly provided on the bottom of the outer wall of the base 15. An assembly seal 14 is fixed on the outer wall of the terminals for sealing the electrode post.

[0029] Specifically, the assembly seal 14 on the outer wall of the incoming voltage sensor 2, which is opened at the bottom of the base 15, allows the connecting parts to be connected through the incoming voltage sensor 2. This ensures that the assembly seal 14 fits tightly against the outer wall of the connection part, effectively preventing impurities and dirt from the surrounding environment from entering the solid-sealed pole and causing contamination. Even under various complex working environments, the assembly seal 14 can always maintain good sealing performance to ensure the stable operation of the entire system.

[0030] Referring to Figures 1 and 2, the moving end of the vacuum interrupter 13 is fixedly connected to a flexible connection 6, and the outgoing terminal is connected to the flexible connection 6 through a fixing bolt 18, forming an electrical connection with the moving end of the vacuum interrupter 13.

[0031] Specifically, the moving end of the vacuum interrupter 13 is fixedly connected to a flexible connection 6, and the outgoing terminal is connected to the flexible connection 6 through a fixing bolt 18, forming an electrical connection with the moving end of the vacuum interrupter 13.

[0032] Working principle: An outgoing voltage sensor 7 and a voltage equalization shielding ring 12 are integrated inside the outdoor epoxy shell 1. The solid-sealed pole achieves dual-sided voltage signal sampling through the incoming voltage sensor 2 and the outgoing voltage sensor 7. Single-sided voltage sampling can also be achieved using either the incoming or outgoing side as needed. The outgoing voltage sensor 7, connected to the vacuum interrupter and software, uses a voltage equalization shielding ring 12 to effectively shield the electric field, reduce the risk of partial discharge, extend the service life of the solid-sealed pole, and make it less prone to breakdown. The phase current sensor and zero-sequence current sensor 8 use low-power coils; both phase current and zero-sequence current use independent low-power current transformer coils. The insulating pull rod 5 and the outgoing copper conductive rod 4... A rigid connection is used, eliminating the need for an internal spring and thus reducing the weight of the insulating pull rod. All incoming high-voltage capacitor low-voltage terminals 10 and outgoing high-voltage capacitor low-voltage terminals 11 are led out to the bottom of the solid-sealed pole. Outgoing high-voltage capacitor low-voltage terminals 11 are installed using a threaded method, thereby simplifying the installation process and wiring steps. The specially designed vacuum interrupter 13 uses a low contact pressure scheme, which extends its service life while maintaining excellent mechanical characteristics such as opening speed. The outer wall of the outdoor epoxy housing 1 is fixedly connected to the terminal block of the incoming voltage sensor. The terminal block of the incoming voltage sensor can monitor the voltage signal of the outdoor pole-mounted circuit breaker in real time and feed it back to the FTU device for fault diagnosis and corresponding control.

[0033] The assembly sealing groove 14 opened at the bottom of the base 15 allows the assembly sealing ring to fit tightly against the outer wall of the connection part, thereby effectively preventing impurities and dirt from the surrounding environment from entering the solid seal column and causing contamination. Even in various complex working environments, the assembly seal 14 can always maintain good sealing performance to ensure the stable operation of the entire system, thereby avoiding the problem of equipment damage caused by external dirt entering the equipment connection.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A solid-sealed pole for a magnetically controlled circuit breaker, comprising an outdoor epoxy shell (1), characterized in that: An inlet terminal (3) is fixedly connected to the top of the outdoor epoxy shell (1). A vacuum interrupter (13) is provided at the bottom of the inlet terminal (3). A copper conductive rod (4) is provided around the vacuum interrupter (13). A flexible connector (6) is fixedly connected to the moving end of the vacuum interrupter (13). An insulating pull rod (5) is fixedly connected below the flexible connector (6). A voltage sensor (7) is installed on the lower middle part of the inner rear end of the outdoor epoxy shell (1). A phase current zero-sequence current sensor is installed on the outlet side of the outdoor epoxy shell (1). The device (8) has a current transformer installed inside the outdoor epoxy shell (1). A voltage equalization shielding ring (12) is provided between the current transformer and the vacuum interrupter (13). The front end of the outdoor epoxy shell (1) is fixedly connected to the outgoing terminal (9). The bottom wall of the outdoor epoxy shell (1) is equipped with the outgoing high voltage capacitor low voltage terminal (11). The bottom wall of the outdoor epoxy shell (1) is equipped with the incoming high voltage capacitor low voltage terminal (10). The bottom wall of the outdoor epoxy shell (1) is equipped with the secondary outgoing terminal of the current transformer.

2. A hermetically sealed pole for a magnetic contact breaker according to claim 1, characterized in that: The bottom of the outdoor epoxy shell (1) is fixedly connected to a base (15). Multiple terminals of the incoming voltage sensor (2) are equidistantly provided on the bottom of the outer wall of the base (15). An assembly seal (14) is fixedly connected to the outer wall of the terminals of the incoming voltage sensor (2). The assembly seal (14) is used to seal the solid electrode.

3. A solid-sealed pole for a magnetically controlled circuit breaker according to claim 1, characterized in that: An incoming voltage sensor (2) is fixedly connected to the rear side of the outer wall of the outdoor epoxy shell (1).

4. A solid-sealed pole for a magnetically controlled circuit breaker according to claim 1, characterized in that: The outer wall of the incoming terminal (3) is equipped with a primary wiring terminal.

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