Three-station vacuum circuit breaker

Abstract

The utility model discloses a three-station vacuum circuit breaker which comprises a rack, an operating mechanism arranged on one side of the rack, three solid-sealed polar poles installed on the rack, and vacuum arc-extinguishing chambers arranged in the solid-sealed polar poles, static conducting rods are arranged on the vacuum arc-extinguishing chambers, a connecting shell is arranged on one sides of the three solid-sealed polar poles, and the other sides of the three solid-sealed polar poles are connected with the connecting shell. Three insulating shells corresponding to the solid-sealed polar poles are arranged on the side, away from the solid-sealed polar poles, of the connecting shell, zero-sequence current transformers are installed in the insulating shells, a connecting copper rod is arranged on the outer side of the static conducting rod, one end of the connecting copper rod sequentially penetrates through the solid-sealed polar poles, the connecting shell, the zero-sequence current transformers and the insulating shells, and the other end of the connecting copper rod penetrates through the connecting shell. According to the utility model, the zero-sequence current transformer is integrated on the solid-sealed polar pole in the circuit breaker through the connecting shell, the insulating shell, the connecting copper bar and the connecting copper bar, so that the zero-sequence current transformer does not need to be installed in a high-voltage cabinet, the occupied space is reduced, and the volume of the high-voltage cabinet can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a three-position vacuum circuit breaker. Background Art

[0002] The three-position vacuum circuit breaker is an indispensable device in the high-voltage cabinet. It is an electrical device that integrates an isolating switch, a vacuum circuit breaker, and a grounding switch. A zero-sequence current transformer is also installed in the high-voltage cabinet. The zero-sequence current transformer is used to monitor and measure the zero-sequence current. When the high-voltage cabinet generates a zero-sequence grounding current, it is used in conjunction with a relay protection device or signal to activate the device components to achieve protection, thereby improving safety.

[0003] The existing three-position vacuum circuit breaker and the zero-sequence current transformer are usually separately arranged, resulting in the zero-sequence current transformer occupying more space in the cabinet, making the high-voltage cabinet larger. Utility Model Content

[0004] The purpose of the utility model is to provide a three-position vacuum circuit breaker to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a three-position vacuum circuit breaker, comprising a frame, an operating mechanism arranged on one side of the frame, three sealed poles installed on the frame, and a vacuum arc extinguishing chamber arranged inside the sealed pole, wherein a static conductive rod is arranged on the vacuum arc extinguishing chamber, a connecting shell is arranged on one side of the three sealed poles, and three insulating shells corresponding to the sealed poles are arranged on the side of the connecting shell away from the sealed pole, respectively, a zero-sequence current transformer is installed inside the insulating shell, a connecting copper rod is arranged on the outer side of the static conductive rod, one end of the connecting copper rod passes through the sealed pole, the connecting shell, the zero-sequence current transformer and the insulating shell in sequence, and one end of the connecting copper rod is fixedly connected to a connecting copper bar, a terminal bar is arranged on one side of the sealed pole, and the end of the connecting copper bar away from the connecting copper rod is connected to the terminal bar.

[0006] As a preferred solution of the utility model, a wire outlet tube is provided on a side of the connection shell close to the operating mechanism, and an umbrella skirt is provided on the outer side of the wire outlet tube.

[0007] As a preferred solution of the utility model, a flange is provided on the outer side of the connecting shell.

[0008] As a preferred solution of the utility model, the materials of the sealed pole, the connecting shell, the insulating shell and the outlet pipe are all epoxy resin.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model integrates the zero-sequence current transformer on the sealed pole in the circuit breaker by setting a connecting shell, an insulating shell, a connecting copper rod and a connecting copper busbar, so that there is no need to install a zero-sequence current transformer in the high-voltage cabinet, reducing the space occupied, thereby reducing the volume of the high-voltage cabinet, and the zero-sequence current transformer is used to monitor and measure the zero-sequence current, so that the equipment protection on the connected secondary line is actuated, thereby achieving a protective effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0011] Figure 2 For this utility model Figure 1 The enlarged view of point A in the middle;

[0012] Figure 3 It is a partial cross-sectional view of the utility model;

[0013] Figure 4 For this utility model Figure 3 Enlarged view of point B in the middle.

[0014] In the figure: 1. frame; 2. operating mechanism; 3. sealed pole; 4. connecting shell; 5. insulating shell; 6. connecting copper bar; 7. terminal block; 8. flange; 9. umbrella skirt; 10. outlet pipe; 11. vacuum interrupter; 12. static conductive rod; 13. connecting copper rod; 14. zero-sequence current transformer. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figures 1 to 4The utility model provides a technical solution: a three-station vacuum circuit breaker, comprising a frame 1, an operating mechanism 2 arranged on one side of the frame 1, three sealed poles 3 installed on the frame 1, and a vacuum arc extinguishing chamber 11 arranged inside the sealed pole 3, a static conductive rod 12 is arranged on the vacuum arc extinguishing chamber 11, and a connecting shell 4 is arranged on one side of the three sealed poles 3. The internal structures of the operating mechanism 2, the vacuum arc extinguishing chamber 11 and the sealed poles 3 are all prior arts, so they are not described in detail. The connecting shell 4 is provided with three insulating shells 5 corresponding to the sealed poles 3 on the side away from the sealed poles 3, respectively. The connecting shell 4 and the insulating shell 5 are used to protect and fix the zero-sequence current transformer 14. The zero-sequence current transformer 14 is installed inside the insulating shell 5. The zero-sequence current transformer 14 is used to monitor And measure the zero-sequence current, so that the equipment protection on the connected secondary line is activated, thereby realizing the protection effect. A connecting copper rod 13 is provided on the outer side of the static conductive rod 12. One end of the connecting copper rod 13 passes through the sealed pole 3, the connecting shell 4, the zero-sequence current transformer 14 and the insulating shell 5 in sequence, and one end of the connecting copper rod 13 is fixedly connected with a connecting copper bar 6. The connecting copper bar 6 is used to connect the connecting copper rod 13 with the terminal bar 7, so as to connect the connecting copper rod 13 to the circuit, so that the zero-sequence current transformer 14 can be measured, so as to realize the integration of the zero-sequence current transformer 14 and the circuit breaker, so that the zero-sequence current transformer 14 does not need to be installed in the high-voltage cabinet, saving space. The connecting copper bar 6 is used to be provided with a terminal bar 7 on one side of the sealed pole 3, and the connecting copper bar 6 is connected to the terminal bar 7 at the end away from the connecting copper bar 13.

[0017] Among them, a wire outlet tube 10 is provided on the side of the connecting shell 4 close to the operating mechanism 2. The external wire can pass through the wire outlet tube 10 and be connected to the zero-sequence current transformer 14, so that the zero-sequence current transformer 14 can transmit the signal, and the wire outlet tube 10 can protect the wire. An umbrella skirt 9 is provided on the outside of the wire outlet tube 10, and the umbrella skirt 9 is used to increase the creepage distance.

[0018] A flange 8 is provided on the outer side of the connecting shell 4, and the flange 8 is used to increase the creepage distance.

[0019] Among them, the materials of the sealed pole 3, the connecting shell 4, the insulating shell 5 and the outlet pipe 10 are all epoxy resin. Epoxy resin has excellent insulation properties, can effectively prevent the flow of current, plays a good insulation role, and has good wear resistance and long service life.

[0020] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0022] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-position vacuum circuit breaker, comprising a frame (1), an operating mechanism (2) arranged on one side of the frame (1), three sealed poles (3) mounted on the frame (1), and a vacuum interrupter (11) arranged inside the sealed poles (3), wherein a static conductive rod (12) is arranged on the vacuum interrupter (11), characterized in that: A connecting shell (4) is provided on one side of the three sealed poles (3); three insulating shells (5) corresponding to the sealed poles (3) are provided on the side of the connecting shell (4) away from the sealed poles (3); a zero-sequence current transformer (14) is installed inside the insulating shell (5); a connecting copper rod (13) is provided on the outside of the static conductive rod (12); one end of the connecting copper rod (13) passes through the sealed pole (3), the connecting shell (4), the zero-sequence current transformer (14) and the insulating shell (5) in sequence; one end of the connecting copper rod (13) is fixedly connected to a connecting copper bar (6); a terminal bar (7) is provided on one side of the sealed pole (3); and the end of the connecting copper bar (6) away from the connecting copper rod (13) is connected to the terminal bar (7).

2. A three-position vacuum circuit breaker according to claim 1, characterized in that: A wire outlet tube (10) is provided on one side of the connection shell (4) close to the operating mechanism (2), and an umbrella skirt (9) is provided on the outer side of the wire outlet tube (10).

3. A three-position vacuum circuit breaker according to claim 1, characterized in that: A flange (8) is provided on the outer side of the connecting shell (4).

4. A three-position vacuum circuit breaker according to claim 2, characterized in that: The material of the sealed pole (3), the connecting shell (4), the insulating shell (5) and the outlet pipe (10) are all epoxy resin.

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