CN218333575U

CN218333575U - Three-phase switch structure

Info

Publication number: CN218333575U
Application number: CN202123299533.9U
Authority: CN
Inventors: 宋玉晨; 傅欣; 赵柏清; 付颖涛; 李瑞梅; 王汝云; 张晓勇; 翟田; 王东旭; 寇金铃; 徐素兰
Original assignee: Beijing Lead Electric Equipment Co Ltd
Current assignee: Beijing Lead Electric Equipment Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2023-01-17
Anticipated expiration: 2031-12-23

Abstract

The application relates to a switch structure especially relates to a three-phase switch structure, and its technical scheme main points are: the three conductive rods are enclosed to form a triangular prism structure and are respectively positioned at three side edges of the triangular prism; the effect of offsetting magnetic fields generated by three conducting rods of the three-phase switch is optimized, so that the aim of reducing the interference on weak current near the three-phase switch is fulfilled.

Description

Three-phase switch structure

Technical Field

The present application relates to a switch structure, and more particularly, to a three-phase switch structure.

Background

The three-phase isolating switch function is one of the main functions in a high-voltage switchgear, and plays the following roles in the switchgear: when a user carries out maintenance on the switch equipment or electric equipment connected with the switch equipment, the high-voltage power supply is reliably isolated and disconnected so as to ensure the safety of an operator.

A three-phase switch described in the related art includes three conductive rods that are parallel to each other, arranged side by side, and distributed at equal intervals, and the three conductive rods correspond to three-phase electrodes, respectively; the three-phase switch also comprises a moving contact for connecting the conducting rod with a main circuit of a user, one end of the conducting rod is a static contact for the moving contact to touch, and after the moving contact moves to the end part of the conducting rod and contacts the static contact, the main circuit is connected with a three-phase power supply.

In view of the above-mentioned related art solutions, the inventors found that: according to the electromagnetic principle, the electrified conducting rods can generate magnetic fields around the electrified conducting rods, and for the magnetic field directions of the three conducting rods, the magnetic field directions of two conducting rods are always opposite to the magnetic field direction of the other conducting rod (the condition that the instantaneous current of one conducting rod is 0 is not considered); now, it is assumed that, in the initial state, the internal currents of the three conductive rods are sequentially: the magnetic field generated by the conducting rod with the forward current is smaller near the conducting rod with the reverse strong current, the magnetic field generated by the conducting rod with the reverse strong current is difficult to cancel, and the stronger magnetic field can certainly cause interference to electric equipment near the conducting rod, especially weak electric equipment.

Furthermore, over time, the internal current flow of the three conductive rods will change along the arrangement: the magnetic field strength around the two conducting rods with the reverse-phase current is changed interactively, so that the magnetic field generated by the conducting rod close to the conducting rod with the forward-phase current can better offset the magnetic field generated by the conducting rod with the reverse-phase strong current, and the magnetic field generated by the conducting rod with the reverse-phase weak current is difficult to offset well; the alternating change of the intensity of the magnetic field and the distance between the magnetic field and the switch can cause the intensity of the magnetic field near the whole three-phase switch to change more violently.

SUMMERY OF THE UTILITY MODEL

In order to optimize the effect of offsetting between three conducting rods of three-phase switch production magnetic field to reduce the interference to the near weak current of three-phase switch, this application provides a three-phase switch structure.

The application provides a three-phase switch structure adopts following technical scheme:

the utility model provides a three-phase switch structure, includes three conducting rod, and three conducting rod encloses into triangular prism structure, and three conducting rod is located the three side edge position department of triangular prism respectively.

By adopting the technical scheme, the distance between the conducting rods positioned on two sides in the related technology is shortened, the magnetic field generated by the conducting rod with the forward current can be more effectively offset with the magnetic fields generated by the other two conducting rods with the reverse current, the offset effect among the magnetic fields generated by the three conducting rods of the three-phase switch is optimized, and the interference to the weak current near the three-phase switch is reduced.

Optionally, the switch-on static contact further comprises a main loop static contact, the conducting rod is provided with a switch-on static contact, the switch-on static contact is provided with a switch-on sliding rod capable of moving towards a direction close to or far away from the main loop static contact in a penetrating manner, the switch-on sliding rod is contacted with the guide cylinder static contact at any time, and the switch-on sliding rod has conductivity.

By adopting the technical scheme, when the user main loop power supply needs to be switched on, the switching-on sliding rod is driven to enable the switching-on sliding rod to abut against the main loop static contact, and the switching-on of the user main loop power supply is realized by switching on the main loop static contact and the switching-on static contact of the sliding rod guide cylinder.

Optionally, a driving screw rod in threaded connection with the conducting slide rod is coaxially arranged on the conducting slide rod in a penetrating manner, and a guide block for preventing the conducting slide rod from rotating is arranged between the conducting slide rod and the conducting static contact.

By adopting the technical scheme, the driving screw rod is driven to rotate around the self axis fixed shaft, so that the sliding rod moves towards the direction close to or far away from the static contact of the main loop along the self axis.

Optionally, a grounding fixed contact is arranged on one side of the conducting rod, the grounding fixed contact is located at one end of the conducting slide rod, which is far away from the fixed contact of the main loop, and the conducting slide rod can move towards a direction close to or far away from the grounding fixed contact; when the conducting slide bar and the grounding fixed contact are disconnected, the grounding fixed contact and the conducting rod are in an insulated state.

By adopting the technical scheme, after the conducting slide rod is abutted against the grounding fixed contact, the conducting rod is grounded, and then the output electric charge is guided into the ground to protect maintainers; in addition, residual charges in the conducting rod can be discharged, and the discharging danger caused by charge accumulation is avoided.

Optionally, an insulating fixing member is disposed on one side of the conducting rod, and the conducting rod, the main circuit fixed contact and the grounding fixed contact are all fixed on the insulating fixing member.

By adopting the technical scheme, the reliable mutual insulation relation among the conducting rod, the main loop static contact and the grounding static contact when the three-phase switch is in the opening state is realized.

Optionally, the device further comprises a bearing fixing piece, the number of the insulating fixing pieces is three, the insulating fixing pieces are all fixed on the bearing fixing piece, and the three insulating fixing pieces correspond to different conducting rods respectively.

Through adopting above-mentioned technical scheme for the three-phase constitutes an organic whole, is convenient for install three-phase switch integral type on consumer.

Optionally, the vacuum circuit breaker further comprises a cable input terminal and a vacuum circuit breaker for conducting or breaking the cable input terminal and the conducting rod.

By adopting the technical scheme, the closing of the load current, the overload current and the short-circuit current in the power system is effectively realized.

Optionally, a main circuit connecting busbar is fixed on the main circuit static contact.

By adopting the technical scheme, the design meets the industry standard so as to facilitate the conduction and the connection of the main loop.

In summary, the present application has the following technical effects:

1. the three conducting rods are made to surround the triangular prism structure, so that the counteracting effect among magnetic fields generated by the three conducting rods of the three-phase switch is optimized, the interference on weak current near the three-phase switch is reduced, and the magnetic field generated by the whole three-phase switch is weaker and the alternating amplitude is smoother;

2. the guide cylinder static contact, the main loop static contact, the grounding static contact and the conduction sliding rod are arranged, so that the switching-on, switching-off and grounding functions of the three-phase switch are realized;

3. by arranging the vacuum circuit breaker, the closing of load current, overload current and short-circuit current in the power system is effectively realized.

Drawings

Fig. 1 is a schematic overall structure diagram of a three-phase switch structure in an embodiment of the present application;

fig. 2 is a schematic diagram of a phase position in a three-phase switch structure in an embodiment of the present application;

fig. 3 is a schematic view of an installation structure between a conducting stationary contact and a conducting sliding rod in an embodiment of the present application.

In the figure, 1, a conductive rod; 2. a main circuit static contact; 3. conducting a static contact; 31. a guide block; 4. conducting the sliding rod; 41. a guide groove; 5. a drive screw; 6. a grounding static contact; 7. an insulating fixing member; 8. carrying the fixing piece; 81. a fixing plate; 9. a cable input terminal; 10. a vacuum interrupter; 11. the main loop is connected with the busbar.

Detailed Description

In the description of the present application, it should be noted that the terms "forward", "reverse", "strong", "weak", and the like are all relative relationships shown in the drawings, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the process or module referred to must have a particular orientation, state, and operation, and therefore, should not be construed as limiting the invention.

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1, the present application provides a three-phase switch structure, which includes a horizontally disposed bearing fixing member 8, the bearing fixing member 8 has three fixing plates 81 sharing a common end point, and the extending directions of the three fixing plates 81 form an included angle of 120 degrees with each other; one end of each of the three fixing plates 81, which is far away from each other, is fixed with a vertically arranged insulating fixing member 7, and one side of each insulating fixing member 7, which is far away from a common end point of the three fixing plates 81, is fixed with a conducting rod 1; the three conductive rods 1 are parallel to each other and are vertically arranged, the three conductive rods 1 form a triangular prism structure together, and the three conductive rods 1 are respectively positioned on three different side edges of the triangular prism structure; in the present embodiment, two adjacent conductive rods 1 in three are equally spaced, that is, the triangular prism is a regular triangular prism.

In addition, a vacuum circuit breaker 10 is arranged below each conducting rod 1, a vacuum arc-extinguishing chamber of each vacuum circuit breaker 10 is fixed on a corresponding fixing plate 81, a static end conducting block of each vacuum circuit breaker 10 is communicated with the conducting rod 1, and a cable input terminal 9 for plugging a cable input section is fixed on a movable conducting rod of each vacuum circuit breaker 10; when the movable conducting rod of the vacuum circuit breaker 10 is abutted against the static end conducting block of the vacuum circuit breaker 10, the conducting rod 1 is connected with a cable and is supplied with power, and then the closing of load current, overload current and short-circuit current in a power system is effectively realized.

Under the condition that the distance between two adjacent conducting rods 1 is unchanged compared with the distance in the related art, the distance between the conducting rods 1 positioned on two sides when the conducting rods are arranged side by side in the related art is shortened, and the three conducting rods 1 are distributed equidistantly in pairs; therefore, the magnetic field generated by the conducting rod 1 with the forward current can be more effectively and simultaneously offset with the magnetic fields generated by the other two conducting rods 1 with the reverse current, the offset effect among the magnetic fields generated by the three conducting rods 1 of the three-phase switch is optimized, and the interference to weak current near the three-phase switch is reduced; in addition, even if the strength relationship of the reverse current of the two conducting rods 1 is interchanged with the lapse of time, the two conducting rods 1 with the reverse current are equidistant from the conducting rod 1 with the forward current, so that when the magnitude of the forward current is not changed, the magnetic field generated by the whole three-phase switch is weaker and the direction is not changed; even if the three-phase current has positive and negative alternate change, the comprehensive magnetic field alternating amplitude generated by the whole three-phase switch can be more gentle.

Referring to fig. 1, a main loop static contact 2, a conducting static contact 3 and a grounding static contact 6 which are sequentially distributed from top to bottom are fixed on one side of the insulating fixing member 7, which is far away from the conducting rod 1; the conducting rod 1 is connected with a cable power supply circuit, the main loop connecting busbar 11 used for connecting a main loop of the electric equipment is fixed on the main loop static contact 2, the three main loop connecting busbars 11 are parallel to each other and correspond to three-phase power arrangement of the main loop of the electric equipment one by one, the conducting static contact 3 is connected with the conducting rod 1 in a conducting mode, and the grounding static contact 6 is connected with a ground wire.

And when the conducting static contact 3 is connected and conducted with the main loop static contact 2, the state corresponds to the closing state of the main loop. When the conducting static contact 3 is connected and conducted with the grounding static contact 6, corresponding to the grounding state of the cable power supply circuit, when an overhaul worker needs to overhaul electric equipment, the three-phase switch is in the grounding state, the three-phase switch can guide output charges into the ground to protect the overhaul worker, in addition, residual charges in the conducting rod 1 can be completely discharged, and the discharging danger caused by charge accumulation is avoided. When the conducting static contact 3 is neither connected with the main circuit static contact 2 nor connected with the grounding static contact 6, the open state of the main circuit corresponds to.

In order to realize the switching between the three states, referring to fig. 2 and 3, the conducting static contact 3 is a cylindrical structure with two open ends, a conducting slide bar 4 which is connected with the conducting static contact 3 in a sliding manner and has conductivity is coaxially arranged inside the conducting static contact 3 in a penetrating manner, the conducting slide bar 4 is vertically arranged between the main circuit static contact 2 and the grounding static contact 6, the length of the conducting slide bar 4 is smaller than the distance between the main circuit static contact 2 and the grounding static contact 6 and can move between the main circuit static contact 2 and the grounding static contact 6 in a reciprocating manner, and the conducting slide bar 4 is matched with the conducting static contact 3, namely the peripheral surface of the conducting slide bar 4 is constantly contacted with the inner wall of the conducting static contact 3; the main loop static contact 2 is also of a cylindrical structure with two open ends, an insulating driving screw rod 5 penetrates through the inside of the main loop static contact 2, the driving screw rod 5 coaxially penetrates through the inside of the conduction slide rod 4 and is in threaded connection with the conduction slide rod 4, and the driving screw rod 5 can axially rotate around the axis of the driving screw rod 5 inside the main loop static contact 2; in order to prevent the conducting slide rod 4 from rotating relative to the conducting static contact 3 under the action of the driving screw 5, the peripheral surface of the conducting slide rod 4 is provided with a guide groove 41 extending along the axial direction of the conducting slide rod, and the inner wall of the main circuit static contact 2 is formed with a guide block 31 which is embedded into the guide groove 41 and can slide in the guide groove 41.

When assembling the three-phase switch, a driving member (such as a motor) or a driving mechanism (such as a belt pulley mechanism) for driving the driving screw 5 to rotate is installed at the upper end of each driving screw 5; when the three-phase switch needs to be in a switching-on state, the driving screw 5 rotates and drives the conduction sliding rod 4 to move upwards, namely in a direction close to the main loop static contact 2, until the upper end of the conduction sliding rod 4 abuts against the lower end of the main loop static contact 2, and at the moment, the lower end of the conduction sliding rod 4 is separated from the upper end of the grounding static contact 6.

When the three-phase switch needs to be in a switching-off state, the driving screw 5 rotates reversely and drives the conducting slide rod 4 to move downwards, namely, in a direction away from the main loop static contact 2, until the upper end of the driving screw 5 is separated from the lower end of the main loop static contact 2, and the lower end of the conducting slide rod 4 is separated from the upper end of the grounding static contact 6.

When the three-way switch needs to be in a grounding state, the driving screw 5 continues to rotate reversely and drives the conducting slide rod 4 to move downwards, namely, in a direction close to the grounding static contact 6, until the lower end of the conducting slide rod 4 abuts against the upper end of the grounding static contact 6, and at the moment, the upper end of the driving screw 5 is separated from the lower end of the main loop static contact 2.

To sum up, the application process of this application is: the conducting slide rod 4 can reciprocate between the main loop static contact 2 and the grounding static contact 6, so that the switching-on, switching-off and grounding functions of the three-phase switch are realized; because the three conducting rods 1 are specially arranged in the application, the offset effect between magnetic fields generated by the three conducting rods 1 of the three-phase switch is optimized, the interference to the weak current near the three-phase switch is reduced, and the magnetic field generated by the whole three-phase switch is weaker and the alternating amplitude is more gentle.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A three-phase switch structure, comprising three conducting bars (1), characterized in that: the three conducting rods (1) are enclosed to form a triangular prism structure, and the three conducting rods (1) are respectively located at three side edges of the triangular prism.

2. A three-phase switch structure according to claim 1, characterized in that: the conductive contact structure is characterized by further comprising a main loop static contact (2), a conductive static contact (3) is arranged on the conductive rod (1), a conductive sliding rod (4) capable of moving towards the direction close to or far away from the main loop static contact (2) penetrates through the conductive static contact (3), the conductive sliding rod (4) is in contact with the guide cylinder static contact all the time, and the conductive sliding rod (4) has conductivity.

3. A three-phase switch structure according to claim 2, characterized in that: a driving screw rod (5) which is in threaded connection with the conducting slide rod (4) is coaxially arranged on the conducting slide rod (4) in a penetrating way, and a guide block (31) which is used for preventing the conducting slide rod (4) from rotating is arranged between the conducting slide rod (4) and the conducting static contact (3).

4. A three-phase switch structure according to claim 2 or 3, characterized in that: one side of the conducting rod (1) is provided with a grounding static contact (6), the grounding static contact (6) is positioned at one end of the conducting slide rod (4) departing from the main loop static contact (2), and the conducting slide rod (4) can move towards the direction close to or far away from the grounding static contact (6); when the conducting slide rod (4) and the grounding fixed contact (6) are mutually disconnected, the grounding fixed contact (6) and the conducting rod (1) are mutually insulated.

5. A three-phase switch structure according to claim 4, characterized in that: an insulating fixing piece (7) is arranged on one side of the conducting rod (1), and the conducting rod (1), the main loop static contact (2) and the grounding static contact (6) are all fixed on the insulating fixing piece (7).

6. A three-phase switch structure according to claim 5, characterized in that: the device is characterized by further comprising a bearing fixing piece (8), wherein the three insulating fixing pieces (7) are arranged and fixed on the bearing fixing piece (8), and the three insulating fixing pieces (7) are respectively arranged corresponding to different conducting rods (1).

7. A three-phase switch structure according to claim 1, characterized in that: the cable breaker further comprises a cable input terminal (9) and a vacuum breaker (10) for conducting or cutting off the cable input terminal (9) and the conducting rod (1).

8. A three-phase switch structure according to claim 2, characterized in that: a main loop connecting bus bar (11) is fixed on the main loop static contact (2).