WO2021174746A1

WO2021174746A1 - Main knife protection device for ultra-high voltage isolation switch, and isolation switch

Info

Publication number: WO2021174746A1
Application number: PCT/CN2020/102842
Authority: WO
Inventors: 马伟君; 贺坤; 邓文华; 唐雪平; 吴上
Original assignee: 湖南长高高压开关集团股份公司; 湖南长高高压开关有限公司
Priority date: 2020-03-02
Filing date: 2020-07-17
Publication date: 2021-09-10
Also published as: CN111403224A

Abstract

A main knife protection device for an ultra-high voltage isolation switch comprises: a rotation prevention portion provided at a front end of an auxiliary moving contact; a position-limiting mechanism having a guide slot allowing the rotation prevention portion to rotate horizontally along with the auxiliary moving contact, a traveling range of the guide slot being consistent with a horizontal rotation range of the auxiliary moving contact, and a diameter of the guide slot being configured to prevent turning of the rotation prevention portion; and a fixing support provided at a side of a main static contact of the isolation switch and used to fix the position limiting mechanism. The present invention achieves limitation of a movement path of the auxiliary moving contact by means of the rotation prevention portion and the position limiting mechanism, and prevents the auxiliary moving contact from being turned before the rotation prevention portion completely passes through the guide slot, thereby achieving movement path limitation of the main knife of an isolation switch, and thus preventing the main knife from turning prematurely. The invention enables, by means of the fixing support, flexible installation of the position limiting mechanism, and also enables flexible detachment of the fixing support itself from the position limiting mechanism.

Description

UHV isolating switch main knife rod protection device and isolating switch

Technical field

The invention belongs to the field of isolating switches, and in particular relates to an ultra-high voltage isolating switch main knife rod protection device and an isolating switch.

Background technique

With the development of power grid business and power transmission projects, some UHV three-column horizontal rotating flip-out disconnect switches with high-parameter bus conversion and breaking capacity have been put into operation. The high-parameter bus conversion and breaking capacity requires a small vacuum circuit breaker to be added to the main conductive circuit of a set of UHV three-pole horizontal rotating flip-type isolating switch, so it can be closed by the main knife lever of the UHV three-pole horizontal rotating flip-type isolating switch The opening is driven by the small vacuum circuit breaker to close. Since the closing of the UHV three-column horizontal rotating and flipping isolating switch is completed by the two-step movement of the main knife bar horizontal rotation movement and the main knife bar turning around its own axis, if the main knife bar horizontal rotation movement step (the two ends of the main knife bar actively touch The head completely enters the main static contact) before the completion of the main tool bar, the main tool bar starts to move around the axis, which will cause the active contacts at both ends of the main tool bar to not enter the main static contact and get stuck in the outer opening of the main static contact, resulting in closing The gate failed. Under normal circumstances, the horizontal rotation of the main tool bar ends, and the active contacts at both ends touch the innermost limit pads of the main static contacts on both sides and will be restricted by resistance, and then the main tool bar will start to compress the main tool bar and flip the main tool bar in the transmission box. Turn over the self-retaining force spring to realize the two-step action closing in place.

When the main tool lever of the UHV three-column horizontal rotating flip-type isolating switch with high-parameter bus conversion and breaking capacity is rotated horizontally to close to the main static contact, the auxiliary movable contact set at the front end of the main static contact needs to be toggled as an auxiliary The miniature circuit breaker in the circuit is closed first, and then the active contact at the front end of the main cutter rod enters the main static contact for flipping action. However, because the force required to switch the miniature circuit breaker to close may increase after the isolating switch is used for a long time, and at the same time, the main tool lever turning retention force may become smaller. UHV three-column horizontal rotating and turning isolation When the switch is switched on, the small circuit breaker may be turned over in advance due to the increase of resistance or the reduction of the main knife lever turning and holding force, which will seriously affect the reliable operation of the power grid.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a UHV isolating switch main tool bar protection device. The UHV isolating switch main tool bar protection device has a simple structure and solves the problem that the UHV three-column horizontally rotating and flipping type isolation switch may flip in advance. The invention also provides an isolating switch.

The main tool bar protection device of the UHV isolating switch according to the embodiment of the first aspect of the present invention includes: an anti-rotation part arranged at the front end of the auxiliary moving contact; a limit mechanism that allows the anti-rotation part to follow the auxiliary moving contact A horizontally rotating guide groove, and the stroke of the guide groove is consistent with the horizontal rotation stroke of the auxiliary moving contact, and the caliber of the guide groove is used to prevent the anti-rotation part from turning over; a fixing bracket is arranged on the isolating switch The side where the main static contact is located is used to fix the limit mechanism.

The protection device for the main tool bar of the UHV isolating switch according to the embodiment of the present invention has at least the following technical effects: the movement trajectory of the auxiliary moving contact can be limited by the anti-rotation part and the limit mechanism, and the auxiliary moving contact can be prevented from rotating. The part turns over before completely passing through the guide groove, thereby realizing the limitation of the movement track of the main knife bar of the isolating switch, and finally achieving the effect of preventing the main knife bar from turning over in advance. The fixed bracket can realize the flexible installation of the limit mechanism, and at the same time, the flexible disassembly of the fixed bracket itself and the limit mechanism can be realized.

According to some embodiments of the present invention, the anti-rotation portion adopts a plate-shaped structure.

According to some embodiments of the present invention, the limiting mechanism adopts channel steel or U-shaped plate.

According to some embodiments of the present invention, an upper splint and a lower splint are respectively provided on the upper and lower sides of the limiting mechanism, and the upper splint and the lower splint are used to adjust the width of the guide groove.

According to some embodiments of the present invention, the fixing bracket includes: a mounting post, which is fixed on the side where the main static contact is located; a connecting part, one end of which is fixed to the mounting post; One end is connected for fixing the limit mechanism.

According to some embodiments of the present invention, the connecting component includes a clamping part, a connecting column, and a connecting seat that are connected in sequence; the clamping part is connected to the mounting column; and the connecting seat is used to install the fixing component.

According to some embodiments of the present invention, an adjusting bolt is provided on the mounting column; the adjusting bolt is used to adjust the length of the mounting column.

According to some embodiments of the present invention, the fixing member adopts a mechanical clamping jaw; the mechanical clamping jaw is fixed on the connecting member.

An isolating switch according to an embodiment of the second aspect of the present invention includes: the above-mentioned UHV isolating switch main knife rod protection device; and a rotating insulator, a turning gear box, and a main knife rod connected in sequence; the rotating insulator is used for driving through the turning The box drives the main tool bar to rotate horizontally; the turning transmission box is also used to rotate the main tool bar around its own axis; active contacts are arranged at both ends of the main tool bar; auxiliary moving contacts are arranged on the active The front end of the contact; the main static contact, which is used to jointly control the on-off of the main power supply circuit with the active contact; the auxiliary static contact, which is used to jointly control the on-off of the auxiliary circuit with the auxiliary moving contact.

The isolating switch according to the embodiment of the present invention has at least the following technical effect: by adding a UHV isolating switch main knife bar protection device, the function of preventing the main knife bar from turning over in advance can be realized. By turning the transmission box, the turning action of the main cutter bar around the axis can be completed. In addition, through the rotating insulator, it is more convenient to access externally powered equipment.

The additional aspects and advantages of the present invention will be partly given in the following description, and partly will become obvious from the following description, or be understood through the practice of the present invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 is a front view of the isolating switch of the present invention (only one side of the main tool lever is shown);

Fig. 2 is an enlarged schematic diagram of a partial position A in Fig. 1;

Figure 3-1 is a schematic diagram of the auxiliary moving contact of the present invention located in the limit mechanism;

Figure 3-2 is a schematic diagram of the active contact of the present invention just moving to the main static contact;

Figure 3-3 is a schematic diagram of the closing of the active contact and the main static contact of the present invention.

Reference signs:

Anti-rotation part 100,

Limiting mechanism 200, upper splint 210, lower splint 220,

The fixing bracket 300, the mounting column 310, the adjusting bolt 311, the connecting part 320, the clamping part 321, the connecting column 322, the connecting seat 323, the fixing part 330,

Rotating insulator 400,

Flip the transmission box 500,

Active contact 600,

Auxiliary moving contact 700,

Main static contact 800,

Auxiliary static contact 900.

Detailed ways

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, but should not be understood as limiting the present invention.

In the description of the present invention, if there are descriptions of the first, second, third, fourth, etc., only for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating what is indicated The number of technical features or implicitly indicate the sequence of the indicated technical features.

In the description of the present invention, unless otherwise clearly defined, terms such as setting and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

The main tool bar protection device of the UHV isolating switch according to the embodiment of the first aspect of the present invention will be described below with reference to FIGS. 1 to 3-3.

The main tool bar protection device of the UHV isolating switch according to the embodiment of the first aspect of the present invention includes: an anti-rotation part 100, a limit mechanism 200, and a fixing bracket 300. The anti-rotation part 100 is arranged at the front end of the auxiliary movable contact 700; the limit mechanism 200 has a guide groove that allows the anti-rotation part 100 to follow the auxiliary movable contact 700 to rotate horizontally, and the stroke of the guide groove is the same as that of the auxiliary movable contact 700 The horizontal rotation stroke is consistent, and the caliber of the guide groove is used to prevent the anti-rotation part 100 from turning over; the fixing bracket 300 is arranged on the side where the main static contact 800 of the isolating switch is located, and is used to fix the limit mechanism 200.

1 to 3-3, the limit mechanism 200 has a guide groove, when the anti-rotation part 100 does not turn over, the guide groove allows the anti-rotation part 100 to pass, and after the anti-rotation part 100 is turned over, the anti-rotation part 100 cannot pass through the guide slot. When the isolating switch starts to close, the main tool lever drives the active contact 600 and the auxiliary moving contact 700 to operate, and then drives the anti-rotation part 100 at the front end of the auxiliary moving contact 700 to follow the movement. When the anti-rotation part 100 runs to the limit mechanism 200, it will pass through the guide groove, but the width of the guide groove is limited, which can only allow the anti-rotation part 100 to pass without turning over, so only when the anti-rotation part 100 moves After exiting the limit mechanism 200, the anti-rotation part 100 can be turned over, thereby restricting the rotation of the auxiliary contact, the main contact, and the main tool bar, thereby achieving the purpose of anti-premature turning.

According to the UHV isolating switch main tool bar protection device of the embodiment of the present invention, the movement track of the auxiliary movable contact 700 can be limited by the anti-rotation part 100 and the limit mechanism 200, and prevent the auxiliary movable contact 700 from being in the anti-rotation part 100. It turns over before completely passing through the guide groove, thereby realizing the limitation of the movement trajectory of the main knife bar of the isolation switch, and finally realizing the effect of preventing the main knife bar from turning over in advance. The fixing bracket 300 can realize the flexible installation of the limiting mechanism 200, and at the same time, the flexible disassembly of the fixing bracket 300 itself and the limiting mechanism 200 can be realized.

In some embodiments of the present invention, referring to FIG. 2, the anti-rotation part 100 adopts a plate-like structure. Adopting the plate-like structure can make the width of the guide groove narrower, and at the same time, because the plate-like structure itself is a slender structure, the possibility of turning over when the anti-rotation part 100 passes through the guide groove can be further reduced by the combination of the two phases.

In some embodiments of the present invention, referring to FIG. 2, the limiting mechanism 200 uses a channel steel or a U-shaped plate. The restriction of the anti-rotation part 100 can be realized by adopting the channel steel or U-shaped plate structure. The gap between the upper and lower sides of the channel steel or U-shaped plate can be used as a guide groove. In theory, the higher the degree of close matching between the width of the guide groove and the thickness of the anti-rotation portion 100, the better. However, considering the problems of rust during actual installation and later use, the width of the guide groove is usually slightly wider than the thickness of the anti-rotation part 100, which can also ensure that the anti-rotation part 100 passes through the guide groove smoothly, and can also prevent the anti-rotation part 100. The role of early flip.

In some embodiments of the present invention, referring to FIG. 2, the upper and lower sides of the limiting mechanism 200 are respectively provided with an upper splint 210 and a lower splint 220, and the upper splint 210 and the lower splint 220 are used to adjust the aperture width of the guide groove. The upper splint 210 and the lower splint 220 may be connected to the upper and lower sides of the limiting mechanism 200 by welding. By adjusting the positions of the upper splint 210 and the lower splint 220 on the upper and lower sides of the limiting mechanism 200, the guide groove enclosed by the upper splint 210 and the lower splint 220 can be adjusted. In this way, the application range of the limit mechanism 200 can be larger, and more types of isolation switches can be used.

In some embodiments of the present invention, referring to FIG. 2, the fixing bracket 300 includes: a mounting post 310, a connecting part 320, and a fixing part 330. The mounting post 310 is fixed on the side where the main static contact 800 is located; one end of the connecting part 320 is fixed on the mounting post 310; the fixing part 330 is connected to the other end of the connecting part 320 for fixing the limit mechanism 200. Through the joint action of the mounting post 310 and the connecting member 320, the fixing member 330 can be set in a suitable position, and the limiting mechanism 200 can be fixed in a suitable position by the fixing member 330.

In some embodiments of the present invention, referring to FIG. 2, the connecting member 320 includes a clamping portion 321, a connecting column 322, and a connecting seat 323 that are connected in sequence; the clamping portion 321 is connected to the mounting column 310; the connecting seat 323 is used for installation and fixation. Parts 330. Generally, in order to ensure that the clamping portion 321 is assembled with the mounting post 310, the clamping portion 321 is provided with a circular through hole matching the mounting post 310, and an opening is provided on one side of the clamping portion 321, so as to ensure The clamping part 321 can be tightly assembled with the mounting post 310. In addition, a bolt hole may be provided on the side of the opening of the clamping portion 321 to facilitate subsequent use of bolts to further lock the clamping portion 321. The connecting seat 323 mainly provides an installation base for the limiting mechanism 200, and a through hole is usually provided on the connecting seat 323 to facilitate subsequent assembly of the limiting mechanism 200 and the connecting seat 323 using bolts or other components. The connecting column 322 is used to connect the clamping portion 321 and the connecting seat 323.

In some embodiments of the present invention, an adjusting bolt 311 is provided on the mounting column 310; the adjusting bolt 311 is used to adjust the length of the mounting column 310. The adjusting bolt 311 is used to adjust the length of the mounting post 310. For different types of isolating switches, the installation environment of the main static contact 800 will be different. Even the installation position of the isolating switch of the same model may have a certain error. Take installation on the equalizing ring as an example, the main static contact There may be a certain error in the distance between the equalizing rings on both sides of the 800, and at the same time, there may be an error in the mounting post 310 itself. The problem of these small errors can be effectively solved by adjusting the bolt 311.

In some embodiments of the present invention, the fixing part 330 adopts mechanical clamping jaws; the mechanical clamping jaws are fixed on the connecting part 320. The use of mechanical clamping jaws can make the position-limiting mechanism 200 and the fixing member 330 more stable and reliable. In some embodiments, a screw is connected to the rear of the fixing part 330, and the screw can facilitate the assembly between the fixing part 330 and the connecting part 320.

The isolating switch according to the embodiment of the second aspect of the present invention includes: UHV isolating switch main knife bar protection device, rotating insulator 400, turning gear box 500, main knife bar, active contact 600, auxiliary moving contact 700, main

static contact

800, 900 auxiliary static contacts. The UHV isolating switch main tool bar protection device is used to limit the turning of the main tool bar; the rotating insulator 400 is used to drive the main tool bar to rotate horizontally through the turning gear box 500; the turning gear box 500 is also used to rotate the main tool bar around its own axis; active contact 600 is set at both ends of the main tool bar; auxiliary moving contact 700 is set at the front end of the active contact 600; the main static contact 800 is used to control the on and off of the main power supply loop together with the active contact 600; the auxiliary static contact 900 is used to Together with the auxiliary movable contact 700, it controls the on-off of the auxiliary circuit.

Referring to FIGS. 1 to 3-3, the rotation of the rotating insulator 400 will drive the turning gear box 500 to operate, which in turn drives the main cutter bar to rotate horizontally. During the horizontal rotation, the main cutter bar does not turn over due to the retention force of the turning gear box 500. In the closing process, because of the existence of the UHV isolating switch's main tool lever protection device, it will not turn over in advance. Therefore, the normal closing of the active contact 600 and the main static contact 800 can be ensured.

According to the isolation switch of the embodiment of the present invention, by adding a UHV isolation switch main tool bar protection device, the function of preventing the main tool bar from turning over in advance can be realized. By turning the transmission box 500, the turning action of the main cutter bar around the axis can be completed. In addition, through the rotating insulator 400, it is more convenient to access externally powered equipment.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, the present invention is not limited to the above embodiments. Those of ordinary skill in the art can understand that these embodiments can be carried out without departing from the principle and purpose of the present invention. With many changes, modifications, substitutions and variations, the scope of the present invention is defined by the claims and their equivalents.

Claims

A protection device for the main tool bar of an UHV isolating switch, which is characterized in that it comprises:

The anti-rotation part (100) is arranged at the front end of the auxiliary moving contact (700);

A limit mechanism (200), which has a guide groove that allows the anti-rotation part (100) to follow the auxiliary moving contact (700) to rotate horizontally, and the stroke of the guide groove is level with the auxiliary moving contact (700) The rotation stroke is consistent, and the caliber of the guide groove is used to prevent the anti-rotation part (100) from turning over;

The fixing bracket (300) is arranged on the side where the main static contact (800) of the isolating switch is located, and is used for fixing the limit mechanism (200).
The main tool bar protection device of the UHV isolating switch according to claim 1, wherein the anti-rotation part (100) adopts a plate-shaped structure.
The main tool bar protection device of the UHV isolating switch according to claim 1 or 2, characterized in that the limit mechanism (200) adopts channel steel or U-shaped plate.
The main tool bar protection device of the UHV isolating switch according to claim 1, wherein the upper and lower sides of the limit mechanism (200) are respectively provided with an upper splint (210) and a lower splint (220), and the upper The splint (210) and the lower splint (220) are used to adjust the aperture width of the guide groove.
The main tool bar protection device of an UHV isolating switch according to claim 1, wherein the fixing bracket (300) comprises:

Mounting post (310), fixed on the side where the main static contact (800) is located;

The connecting component (320), one end of which is fixed on the mounting post (310);

The fixing part (330) is connected with the other end of the connecting part (320) and is used for fixing the limiting mechanism (200).
The main tool bar protection device of an UHV isolating switch according to claim 5, characterized in that the connecting part (320) comprises a clamping part (321), a connecting column (322), and a connecting seat (323) connected in sequence; The clamping portion (321) is connected with the mounting post (310); the connecting seat (323) is used for mounting the fixing component (330).
The main tool bar protection device of the UHV isolating switch according to claim 5, characterized in that an adjusting bolt (311) is provided on the mounting column (310); the adjusting bolt (311) is used to adjust the mounting column (310) length.
The main tool bar protection device of the UHV isolating switch according to claim 5, characterized in that the fixing part (330) adopts a mechanical clamping jaw; the mechanical clamping jaw is fixed on the connecting part (320).
An isolating switch, characterized by comprising: the main tool lever protection device of the UHV isolating switch according to any one of claims 1 to 8; and

The rotating insulator (400), the turning gear box (500), and the main knife rod are connected in sequence; the rotating insulator (400) is used to drive the main knife rod to rotate horizontally through the turning gear box (500); the turning gear box (500) is also used to rotate the main cutter bar around its own axis;

Active contacts (600) are arranged at both ends of the main cutter bar;

The auxiliary moving contact (700) is arranged at the front end of the active contact (600);

The main static contact (800) is used to control the on-off of the main power supply loop together with the active contact (600);

The auxiliary static contact (900) is used for controlling the on-off of the auxiliary circuit together with the auxiliary moving contact (700).