CN222546148U - An isolating contact - Google Patents

Abstract

The utility model relates to the field of high-voltage electrical equipment, and provides an isolation contact, which comprises a moving contact, a shielding cover and an insulating cylinder, wherein the shielding cover and the insulating cylinder are sleeved outside the moving contact, a screw rod mechanism is arranged in the moving contact, a conductor with high voltage is arranged outside the moving contact in a connecting way, the shielding cover is arranged in the insulating cylinder, the shielding cover comprises a first shielding cover, a second shielding cover and a third shielding cover which are arranged in a gap way, the first shielding cover is connected with the conductor in a high-voltage way, the screw rod mechanism drives the moving contact to move towards or away from the second shielding cover and the third shielding cover, so that the moving contact is connected with the second shielding cover and the third shielding cover in a high-voltage way, the field intensity in an air cavity is effectively reduced, the partial discharge is reduced, the compressive strength is improved, meanwhile, the shielding break is formed between the second shielding cover and the first shielding cover and the third shielding cover, and the electric field can be effectively shielded by arranging a reasonable break length.

Description

Isolation contact

Technical Field

The utility model relates to the field of high-voltage electrical equipment, in particular to an isolation contact.

Background

The high-voltage isolating switch is an important switching device in electric systems of power plants and substations, and is required to be matched with a high-voltage circuit breaker, the isolating switch is suitable for an indoor device with a three-phase alternating current of 50Hz and a rated voltage of 40.5KV, and is used for switching on, switching off or switching on a circuit under the condition of voltage and load of high-voltage equipment, wherein the high-voltage isolating switch drives an isolating contact to move through a screw rod mechanism to realize switching on, isolating and grounding work of three stations of the isolating switch, and when the isolating contact is in a switching on and conducting state, an insulating cylinder is usually sleeved on the isolating contact for preventing electric shock, but the insulating cylinder is inconvenient to be large due to the consideration of compactness of the whole size of the high-voltage isolating switch.

However, under the condition that the thickness of the insulating cylinder is smaller, the possibility of breakdown exists, the electric shock danger can be caused by the ground fault current caused by the leakage current, the personal injury is caused, meanwhile, the short circuit can be caused by the insulation breakdown under the normal operating voltage, and the high-voltage isolating switch is unsuccessful in closing.

Disclosure of utility model

The utility model aims to provide an isolation contact, which aims to solve the problem that the prior insulation cylinder is limited in size and possibly broken down.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The isolation contact comprises a moving contact, a shielding cover and an insulating cylinder, wherein the shielding cover and the insulating cylinder are sleeved outside the moving contact, a screw rod mechanism is arranged in the moving contact, a conductor with high voltage is arranged outside the moving contact in a connecting mode, the shielding cover is arranged in the insulating cylinder, and the shielding cover comprises a first shielding cover, a second shielding cover and a third shielding cover which are arranged in a clearance mode;

The first shielding cover is connected with the conductor at high voltage, the screw rod mechanism drives the moving contact to move towards or away from the second shielding cover and the third shielding cover, the moving contact is connected with or disconnected from the second shielding cover and the third shielding cover at high voltage, and a shielding fracture is formed between the second shielding cover and a gap between the first shielding cover and the third shielding cover.

Preferably, the axial length of the shielding fracture is 40-55mm.

Preferably, the material of the shielding case is brass.

Preferably, the insulating cylinder is made of epoxy resin material.

Preferably, the insulating cylinder comprises an insulating cylinder and an insulating shell, wherein the insulating cylinder and the insulating shell are sleeved on the movable contact from inside to outside, the first shielding cover is arranged on one end of the insulating shell, which is close to the conductor, the third shielding cover is arranged on one end of the insulating shell, which is far away from the conductor, and the second shielding cover is arranged on the middle part of the insulating cylinder.

Preferably, an annular contact seat is arranged in the middle of the moving contact, the inner wall of the contact seat is connected with the moving contact, and the second shielding cover is locked and attached to the contact seat.

Preferably, the surface of the insulating housing is coated with a semiconductive coating.

After the technical scheme is adopted, compared with the background technology, the utility model has the following advantages:

1. According to the utility model, the characteristics of switching on and switching off are skillfully realized by utilizing the connection of the moving contact and the outgoing conductor, and the shielding cases capable of being connected with high voltage are arranged on the insulating cylinder at intervals on the axial movement path of the moving contact, when the shielding cases are connected with high voltage, the induced voltage of the insulating cylinder near the end part of the shielding case is increased, the high-voltage pressure difference between the insulating cylinder and the moving contact is reduced, the field intensity in the air cavity is effectively reduced, the partial discharge is reduced, and the compression strength is improved.

2. In the utility model, the axial length of the shielding fracture is 40-55mm, so that the minimum induced voltage of the insulating cylinder near the shielding fracture and the high-voltage differential pressure of the moving contact are in a small reasonable range, the electric field in the insulating cylinder is effectively and uniformly distributed, and partial discharge phenomenon can be generated.

Drawings

FIG. 1 is a schematic diagram of an isolating switch according to the present utility model;

FIG. 2 is a schematic diagram of an isolating switch according to the present utility model;

Fig. 3 is an enlarged schematic view of the portion a shown in fig. 1.

Reference numerals illustrate:

1. The movable contact comprises a movable contact, a shielding cover, a first shielding cover, a second shielding cover, a third shielding cover, a shielding fracture, an insulating cylinder, a separating cylinder, a 32, an insulating shell, a 4-screw mechanism, a 5-conductor, a 6-air cavity, a 7-contact seat and an 8-outgoing conductor, wherein the movable contact is a movable contact, the shielding cover, the first shielding cover, the second shielding cover, the third shielding cover, the shielding fracture and the shielding shell are arranged in sequence.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In addition, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element of the present utility model must have a specific orientation, and thus should not be construed as limiting the present utility model.

When an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or both in internal communication or in an interactive relationship between two elements. The specific meaning of the above terms in the utility model will be understood by those skilled in the art according to the specific circumstances.

Examples

Referring to fig. 1 and 2, the present embodiment provides an isolation contact, which includes a moving contact 1, a shielding cover 2 and an insulating cylinder 3 sleeved outside the moving contact 1, wherein a screw rod mechanism 4 is disposed in the moving contact 1, a conductor 5 with high voltage is connected outside the moving contact 1, an air cavity 6 is disposed between the insulating cylinder 3 and the moving contact 1, the shielding cover 2 is disposed in the insulating cylinder 3, the shielding cover 2 includes a first shielding cover 21, a second shielding cover 22 and a third shielding cover 23 disposed in a gap, the first shielding cover 21 is connected with the conductor 5 in high voltage, the screw rod mechanism 4 drives the moving contact 1 to move towards or away from the second shielding cover 22 and the third shielding cover 23, and the gap between the moving contact 1 and the second shielding cover 22 and the third shielding cover 23 forms a shielding fracture 24.

Specifically, the screw rod mechanism 4 drives the moving contact 1 to move, so that the moving contact 1 and the wire outlet conductor 8 are connected or disconnected, and switching on and off of the isolation contact are realized, on the basis, on the axial movement path of the moving contact 1, a shielding case 2 capable of being connected with high voltage is arranged on the insulating cylinder 3 at intervals, when the shielding case 2 is connected with high voltage, the induced voltage of the insulating cylinder 3 near the end part of the case body is increased, the high-voltage pressure difference between the insulating cylinder 3 and the moving contact 1 is reduced, the field intensity in the air cavity 6 is effectively reduced, partial discharge is reduced, the compression strength is improved, the product is safer and more reliable, and the service life of the product is prolonged.

The first shielding cover 21 is connected with the conductor 5 to introduce high voltage, the second shielding cover 22 is connected with the moving contact 1 through the contact seat 7 to introduce high voltage, the third shielding cover 23 is connected with the outgoing conductor 8, when the moving contact 1 is connected with the outgoing conductor 8, the third shielding cover 23 introduces high voltage, the first shielding cover 21, the second shielding cover 22 and the third shielding cover 23 are arranged in a gap mode, the first shielding cover is not connected, the function of a fracture is achieved, when the moving contact 1 is close to the outgoing conductor 8, when the moving contact 1 is not connected with the contact seat 7, only the first shielding cover 21 is high-voltage, when the moving contact 1 is connected with the contact seat 7, but not in butt joint with the outgoing conductor 8, the first shielding cover 21 and the second shielding cover 22 are still in a split-gate state, when the moving contact 1 is in butt joint with the outgoing conductor 8, the first shielding cover 21, the second shielding cover 22 and the third shielding cover 23 are all in high-voltage distribution, the isolation contact is in a closing state, and the moving contact 1 moves to be connected with the outgoing conductor 8 through the design, and the characteristics of realizing the split-gate are simple and practical structure.

In addition, the contact seat 7 is annularly arranged in the middle of the moving contact 1, the inner wall of the contact seat 7 is connected with the moving contact 1, and the second shielding cover 22 is locked and attached to the contact seat 7.

Further, as shown in fig. 1 and 3, the axial length d of the shielding fracture 24 is 40-55mm, in the present utility model, the adjustment of the axial length d of the shielding fracture 24 can control the minimum induced voltage of the insulating cylinder 3 near the shielding fracture 24, when the axial length d of the fracture is reduced, the minimum induced voltage is increased, the induced voltage of the insulating cylinder 3 and the high voltage differential pressure of the moving contact 1 are reduced, and the field strength is reduced, so that the axial length d of the shielding fracture 24 is not too large, and if the axial length d is too large, a partial discharge phenomenon may occur, and in a preferred manner, the axial length d of the shielding fracture 24 is 52.5mm.

Further, the material of the shielding case 2 is brass, which is a copper alloy containing a certain amount of zinc and has better conductivity, and in addition, other metals such as tin, iron, aluminum, lead, silicon and manganese can be added into the brass, and unique properties can be realized by adding other metals, for example, the zinc content in the brass can help to improve the ductility and strength of the brass-based copper material, and the higher the zinc content in the brass, the stronger the elasticity of the alloy and the processing is convenient.

Further, the insulating cylinder 3 is made of an epoxy resin material, and the epoxy resin material has the advantages of high cohesive force, high adhesion, good flexibility, excellent heat curing performance, stable chemical corrosion resistance and the like, and is outstanding in organic insulating materials, and various solid materials can be manufactured through vacuum casting by an epoxy resin casting system such as an automatic epoxy pressure gel manufacturing process (APG process).

Further, the insulating cylinder 3 comprises an insulating cylinder 31 and an insulating shell 32 which are sleeved on the moving contact 1 from inside to outside, the first shielding cover 21 is arranged at one end of the insulating shell 32 close to the conductor 5, the third shielding cover 23 is arranged at one end of the insulating shell 32 far away from the conductor 5, the second shielding cover 22 is arranged in the middle of the insulating cylinder 31, wherein the first shielding cover 21 and the third shielding cover 23 are cast in the insulating shell 32 in advance, the second shielding cover 22 is cast in the insulating cylinder 31 in advance, and finally the insulating shell 32 and the insulating cylinder 31 are combined into a whole to form the insulating cylinder 3.

Further, the insulating housing 32 is coated with a semiconductive coating to achieve grounding of the outer fully insulating surface, while reducing the corrosive effects of the operating environment, so that the integrity of the insulating cylinder 3 can be maintained and the potential adverse effects of foreign substances can be reduced.

It should be noted that, when the moving contact 1 moves to contact with the outgoing conductor 8, the position is a closing conducting state of grounding opening and isolating closing, and the insulating cylinder 3 is only a shell structure outside the closing chamber, and does not include other modules.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (7)

1. The isolation contact is characterized by comprising a moving contact, a shielding cover and an insulating cylinder, wherein the shielding cover and the insulating cylinder are sleeved outside the moving contact, a screw rod mechanism is arranged in the moving contact, a conductor with high voltage is connected and arranged outside the moving contact, the shielding cover is arranged in the insulating cylinder, and the shielding cover comprises a first shielding cover, a second shielding cover and a third shielding cover which are arranged in a clearance mode;

The first shielding cover is connected with the conductor at high voltage, the screw rod mechanism drives the moving contact to move towards or away from the second shielding cover and the third shielding cover, the moving contact is connected with or disconnected from the second shielding cover and the third shielding cover at high voltage, and a shielding fracture is formed between the second shielding cover and a gap between the first shielding cover and the third shielding cover.

2. The isolated contact of claim 1, wherein the shield break has an axial length of 40-55mm.

3. The isolated contact of claim 1, wherein the material of the shield is brass.

4. The isolating contact as in claim 1, wherein the insulating sleeve is made of an epoxy material.

5. The isolating contact as in claim 4, wherein the insulating cylinder comprises an isolating cylinder and an insulating shell which are sleeved on the movable contact from inside to outside, the first shielding cover is arranged at one end of the insulating shell, which is close to the conductor, the third shielding cover is arranged at one end of the insulating shell, which is far away from the conductor, and the second shielding cover is arranged in the middle of the isolating cylinder.

6. The isolating contact as in claim 1, wherein an annular contact seat is arranged in the middle of the moving contact, the inner wall of the contact seat is connected with the moving contact, and the second shielding cover is locked and attached to the contact seat.

7. The isolated contact of claim 5, wherein the insulating housing surface is coated with a semiconductive coating.