CN204303664U - A kind of switch fracture texture and there is the high-voltage switch gear of this switch fracture texture - Google Patents

Abstract

The utility model relates to a switch fracture structure and a high-voltage switch with the switch fracture structure. One of the switch opening structures includes a first static contact and a second static contact for conducting or disconnecting the moving contact set by guiding movement, and the first static contact is conductively connected with a first shielding The second shielding cylinder is conductively connected to the second static contact. The first shielding cylinder and the second shielding cylinder are separated from each other and sealed together by epoxy resin. The first shielding cylinder and the second shielding cylinder Adjacent ends of the shielding tubes are aligned or nested with each other in the direction along the axes of the two shielding tubes. The above-mentioned switch fracture structure has small volume, good insulation performance and compact structure.

Description

A switch fracture structure and a high-voltage switch with the switch fracture structure

technical field

The utility model relates to a switch fracture structure and a high-voltage switch with the switch fracture structure.

Background technique

Solid insulated ring network cabinet is a new type of secondary distribution switch that encapsulates high-voltage switching elements and high-voltage live parts with epoxy resin, because it avoids the use of greenhouse gas SF6, and has good insulation performance and small overall size. , strong environmental adaptability and high degree of modularization and many other advantages have been vigorously promoted in the power grid system. In order to make the overall safety higher, the power system requires the outer surface of the epoxy resin of the solid insulation ring network cabinet to be reliably grounded, but most of the solid ring network cabinets on the market do not meet this point, and the insulation problem at the break of the switch is the cause One of the main reasons why epoxy exterior surfaces are difficult to ground.

At present, the isolation fracture of the isolating switch of the solid insulated ring main unit on the market mainly uses two kinds of insulating medium, namely vacuum insulating medium and air insulating medium. The vacuum isolating switch improves the internal structure of the mature vacuum interrupter technology, and encapsulates epoxy resin in the outer shell to make it a vacuum interrupter with three stations (conduction, isolation, grounding). Insulates the isolating and grounding breaks. The vacuum isolating switch has a simple structure, small size, and is easy to seal. However, due to the risk of air leakage, the reliability of vacuum as an isolation fracture has not been fully accepted by users. The so-called "solid isolating switch" on the market is actually sealing the air cavity of the isolation or grounding fracture by epoxy resin casting. The insulating medium between the fractures is still air, and the solid only bears the external auxiliary of the conductor. insulation. For example, the Chinese patent application number 200810012076.0 and authorized announcement number CN 101620947 B discloses the "epoxy cast fully insulated solid isolating switch", which uses air insulation medium, including the isolation body and three static contacts, and the whole is passed through epoxy resin Casting into a fully sealed integrated structure, the three static contacts are ground contact, isolation contact and intermediate contact; the isolation switch is also equipped with a moving contact for guiding movement, and the moving contact is set for guiding and moving to connect the intermediate contact Connect with the isolation contact or connect the intermediate contact with the ground contact, so as to realize the conduction or isolation ground of the isolation switch. The fracture insulation of this type of structure is mainly borne by air when the switch is opened, so it is necessary to set a larger fracture spacing, resulting in a larger overall axial dimension; while the external insulation is essentially a composite insulation of air + solid, and the moving contact and the There is inevitably an air gap between the epoxy resins. Due to the electric field problem, the partial discharge in the air gap is often large, which makes it difficult to pass the insulation test after the epoxy resin shell is coated with a ground shielding layer, and also leads to a large radial dimension. There are also products on the market that use the technology of inflatable switchgear to encapsulate the part of the isolating switch of the solid cabinet in a large air cavity with the insulating material of the shell grounding, which is bulky and expensive.

Utility model content

The purpose of the utility model is to provide a switch fracture structure with small volume and good insulation performance. At the same time, the utility model also provides a high-voltage switch with the switch fracture structure.

The technical solution adopted by a switch fracture structure in the utility model is: a switch fracture structure, including a first static contact and a second static contact used to realize conduction or disconnection by means of a moving contact set by guiding movement , the first static contact is conductively connected with a first shielding cylinder, the second static contact is conductively connected with a second shielding cylinder, the first shielding cylinder and the second shielding cylinder are separated from each other and covered by epoxy The resin is sealed together, and the adjacent ends of the first shielding cylinder and the second shielding cylinder are aligned or nested with each other in the direction along the axis of the two shielding cylinders.

The first static contact, the second static contact, the first shielding cylinder and the second shielding cylinder are all solidly sealed in a shell formed by pouring epoxy resin, and the epoxy resin is provided with a Pilots that guide movement.

A ground shielding layer is sprayed on the outer surface of the shell.

Both the first shielding cylinder and the second shielding cylinder are cylindrical and arranged coaxially.

The first shielding cylinder and the second shielding cylinder are respectively fixed on the ends of the first static contact and the second static contact which are close to each other by means of screws. The shielding cylinder is correspondingly a conductive sleeve connected to the first static contact and the second static contact.

The technical solution adopted by a high-voltage switch in the utility model is: a high-voltage switch, which includes a switch fracture structure, and the switch fracture structure includes a first static contact for conducting or disconnecting by means of a movable contact set by guiding movement. contact and the second static contact, the first static contact is conductively connected to the first shielding cylinder, the second static contact is conductively connected to the second shielding cylinder, the first shielding cylinder and the second The shielding cylinders are separated from each other and sealed together by epoxy resin. Adjacent ends of the first shielding cylinder and the second shielding cylinder are aligned or nested with each other in the direction along the axes of the two shielding cylinders.

The first static contact, the second static contact, the first shielding cylinder and the second shielding cylinder are all solidly sealed in a shell formed by pouring epoxy resin, and the epoxy resin is provided with a Pilots that guide movement.

A ground shielding layer is sprayed on the outer surface of the shell.

Both the first shielding cylinder and the second shielding cylinder are cylindrical and arranged coaxially.

The first shielding cylinder and the second shielding cylinder are respectively fixed to the ends of the first static contact and the second static contact which are close to each other by means of screws.

The utility model adopts the above-mentioned technical scheme, the first static contact and the second static contact in the switch fracture structure are conductively connected with the first shielding cylinder and the second shielding cylinder respectively, and the first shielding cylinder and the first static contact etc. Potential, the second shielding cylinder and the second static contact have the same potential, the first shielding cylinder and the second shielding cylinder are separated from each other and sealed together by epoxy resin, the first shielding cylinder and the second shielding cylinder The adjacent ends of the tubes are aligned or nested with each other along the axis of the two. Therefore, the electric field can be relatively concentrated in the epoxy resin adjacent to the first shielding tube and the second shielding tube, so that the insulation between the fractures The function is mainly undertaken by epoxy resin, and the dielectric strength of epoxy resin is very high, so the axial dimension of the switch fracture structure can be greatly reduced; at the same time, since the adjacent ends of the first shielding cylinder and the second shielding cylinder Align or nested with each other in the direction of the axis, the corresponding gap between the moving contact and the epoxy resin can be completely shielded by the first shielding cylinder and the second shielding cylinder, so that the insulation of the high-voltage conductor to the outside is completely covered by the epoxy resin Commitment, greatly improve the insulation performance, can reduce the radial size of the switch fracture structure, small size, compact structure, good reliability.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of a switch fracture structure in the utility model when it is in the closing position;

Fig. 2 is a structural schematic diagram of the switch fracture structure in Fig. 1 when it is in the opening position.

The names corresponding to the reference marks in the figure are: 10-upper static contact, 11-upper contact finger installation groove, 12-upper shielding cylinder, 20-lower static contact, 21-lower contact finger installation groove, 22-lower Shielding cylinder, 30-spring contact, 40-screw, 50-epoxy resin shell, 60-moving contact, 70-air cavity.

Detailed ways

An embodiment of a switch fracture structure in the utility model is shown in Fig. 1~Fig. The lower static contact 20 of the second static contact is guided and moved along the axis of the upper static contact 10 and the lower static contact 20 to realize the dynamic connection or disconnection of the upper static contact 10 and the lower static contact 20. Contact 60.

The upper static contact 10 and the lower static contact 20 are both cylindrical, and the inner cylinder wall is respectively provided with an upper contact finger installation groove 11 and a lower contact finger installation groove 21, and an upper contact finger installation groove 11 and a lower contact finger installation groove. 21 are equipped with spring contacts 30 for conductive connection with the cylindrical moving contacts 60 that move along the up and down guides. Certainly, in other embodiments, the connection between each static contact and the movable contact 60 may also be conducted through other structures than the spring contact 30 , such as watchband contact fingers.

Screw holes are provided on the outer peripheral surface of the lower end of the upper static contact 10, and the corresponding upper shielding cylinder 12 is coaxially fixed on the upper static contact 10 by screws 40. The conductive sleeve for conducting the first static contact can ensure good conduction between the upper static contact 10 and the upper shielding cylinder 12 . Screw holes are provided on the outer peripheral surface of the upper end of the lower static contact 20, and the corresponding lower shielding cylinder 22 is coaxially fixed on the lower static contact 20 by screws 40. A conductive sleeve for the conduction of the static contact can ensure good conduction between the lower static contact 20 and the lower shielding cylinder 22 . The upper shielding cylinder 12 and the lower shielding cylinder 22 are separated from each other and their adjacent ends are aligned with each other in the direction of the axis of the two, forming a continuous shielding in the direction of the axis of the two. The upper static contact 10, the lower static contact 20, the upper shielding cylinder 12 and the lower shielding cylinder 22 are all sealed in the epoxy resin casing 50 formed by pouring epoxy resin, and the epoxy resin casing 50 is provided with perforations , for the movable contactor 60 to move.

When the isolating switch is in the closing position, the moving contact 60 is in conductive contact with the upper static contact 10 and the lower static contact 20, and the upper static contact 10, the lower static contact 20, the upper shielding cylinder 12, the lower shielding cylinder 22 and the moving contact The heads 60 are all equipotential high-voltage live conductors. To realize the up and down movement of the movable contact 60, there will inevitably be a gap between the movable contact 60 and the epoxy resin. , The lower shielding cylinder 22 can completely shield the narrow gap between the movable contact 60 and the epoxy resin, so that the external insulation of the high-voltage conductor is completely borne by the epoxy resin, because the dielectric strength of the epoxy resin is much higher than that of air , so the radial size of the isolation switch can be smaller; and, a zero-potential grounding shielding layer can also be sprayed on the outer surface of the epoxy resin, so that the internal components are protected from the external environment and the outer surface can be touched, which increases safety , reliable insulation.

When the isolating switch is opened, the moving contact 60 moves downward, separates from the upper static contact 10, and is still conductively connected with the lower static contact 20. An air cavity 70 is formed between the upper and lower static contacts. At this time, the upper static contact The contact 10 and the lower static contact 20 need to bear the voltage required by the isolating switch, but since the upper shielding cylinder 12 and the lower shielding cylinder 22 are respectively equipotential with the upper static contact 10 and the lower static contact 20, the upper Between the shielding cylinder 12 and the lower shielding cylinder 22, there is also the voltage required between the fractures of the isolating switch; since the upper and lower shielding cylinders 22 are poured in epoxy resin, the distance is the closest, so that the electric field lines are near the junction of the upper and lower shielding cylinders 22 The epoxy resin is relatively concentrated in the air cavity 70 due to the electric field shielding effect of the shielding tube, and the electric field intensity is very small, so the insulating function is mainly performed by the epoxy resin. Similarly, due to the strong dielectric strength of epoxy resin, the fracture length can be greatly shortened, the axial length of the structure of the utility model can be reduced, the possibility of partial discharge can be reduced, the insulation reliability can be increased, and the structural modularization can be realized ,Simple structure.

An embodiment of a high-voltage switch in the utility model is a high-voltage switch using the above-mentioned switch fracture structure, and the specific structure will not be repeated here.

In the above-mentioned embodiment, the adjacent ends of the first shielding cylinder and the second shielding cylinder are aligned with each other along the axis of the two, and the corresponding static contacts are fixed by screws 40. In other implementations of the present utility model In this example, the adjacent ends of the first shielding cylinder and the second shielding cylinder are nested and fitted in the direction along the axis of the two, and the corresponding static contacts can also be fixed and electrically connected in other ways, such as welding connection, For riveting, etc., the materials of the upper shielding cylinder 12 and the lower shielding cylinder 22 can be conductive materials or semi-conductive materials commonly used in shielding rings in this field. In addition, the breakout structure of the switch in the above embodiments is applied to the main circuit of the isolating switch. In other embodiments, the breakout structure of the switch can also be applied to other occasions, such as the breakout of the grounding switch.

Claims (10)

1. A switch fracture structure, including a first static contact and a second static contact for turning on or off by means of a moving contact set by guiding movement, characterized in that: A first shielding cylinder is electrically connected, and a second shielding cylinder is electrically connected to the second static contact. The first shielding cylinder and the second shielding cylinder are separated from each other and sealed together by epoxy resin. Adjacent ends of the first shielding cylinder and the second shielding cylinder are aligned or nested with each other in the direction along the axes of the two shielding cylinders. 2. A switch fracture structure according to claim 1, characterized in that: the first static contact, the second static contact, the first shielding cylinder and the second shielding cylinder are all sealed in the cast ring In the shell formed by epoxy resin, the epoxy resin is provided with a perforation for guiding and moving the movable contact. 3. A switch breakout structure according to claim 2, characterized in that a ground shielding layer is sprayed on the outer surface of the housing. 4. A switch opening structure according to claim 1, 2 or 3, characterized in that: the first shielding cylinder and the second shielding cylinder are both cylindrical structures and coaxially arranged. 5. A switch breakout structure according to claim 1, 2 or 3, characterized in that: the first shielding cylinder and the second shielding cylinder are respectively fixed on the first static contact and the second static contact by screws. At one end of the contacts close to each other, the screw is covered with a conductive sleeve for making the first shielding cylinder and the second shielding cylinder conduct with the first static contact and the second static contact correspondingly. 6. A high-voltage switch, comprising a switch fracture structure, said switch fracture structure comprising a first static contact and a second static contact for conducting or disconnecting a moving contact set by guiding movement, characterized in that : the first static contact is conductively connected with a first shielding tube, the second static contact is conductively connected with a second shielding tube, and the first shielding tube and the second shielding tube are separated from each other and covered by epoxy The resin is sealed together, and the adjacent ends of the first shielding cylinder and the second shielding cylinder are aligned or nested with each other in the direction along the axis of the two shielding cylinders. 7. A high-voltage switch according to claim 6, characterized in that: the first static contact, the second static contact, the first shielding cylinder and the second shielding cylinder are all sealed in the cast epoxy In the shell formed by the resin, the epoxy resin is provided with a perforation for guiding and moving the movable contact. 8. A high voltage switch according to claim 7, characterized in that: a ground shielding layer is sprayed on the outer surface of the housing. 9. A high-voltage switch according to claim 6, 7 or 8, characterized in that: the first shielding cylinder and the second shielding cylinder are both cylindrical structures and arranged coaxially. 10. A high-voltage switch according to claim 6, 7 or 8, characterized in that: the first shielding cylinder and the second shielding cylinder are respectively fixed on the first static contact and the second static contact by screws. The ends where the heads are close to each other.