CN1214404C

CN1214404C - Isolator for high-voltage switch equipment

Info

Publication number: CN1214404C
Application number: CN 99123451
Authority: CN
Inventors: 迪特尔·洛伦茨; 曼弗雷德·迈因赫茨; 阿明·格伦德
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 1998-11-20
Filing date: 1999-11-08
Publication date: 2005-08-10
Anticipated expiration: 2019-11-08
Also published as: CH694413A5; DE19952719B4; FR2786310A1; CN1257288A; JP2000164081A; FR2786310B1; JP4531893B2; DE19952719A1

Abstract

The invention provides an insulator having high dielectric strength even at a low height by providing a cast resin body 2 has a rounded nearly rectangular parallelopiped profile, and it is divided into an upper junction 10, a lower junction 11 and an intermediate section made of two wall portions 12, 13 arranged face to face on side faces. Both connecting tools 3, 4 are buried to be flush with both junctions 10, 11.

Description

The insulator that high voltage switchgear is used

Technical field

The present invention relates to the field of electric switch and can be applicable to high voltage switchgear, for the member supporting that is in high-voltage is on earthy supporting member at one, have a insulator in the high voltage switchgear, have a zone that does not have the filling casting resin in this insulator zone between two connection fittings with casting resin system.

Background technology

In the high voltage switchgear that a kind of known gases at high pressure insulate, in order to drive the feeler lever of the portable circuit breaker of plug-in strip, be provided with a spool insulator that is called the insulating material axle, it on metal shell, and has supported an axle that gear is housed that is used to drive this feeler lever by means of an one end surface supporting in its another end.This insulator is shaped on the rib (DE 1540513A1) that improves leakage distance and use.

In the high voltage switchgear of the known gases at high pressure insulated metal shell encapsulation of another kind, establish an insulator in order to drive circuit breaker, it is become by hollow casting resin system, and its ground connection side and high-pressure side are provided with rotational symmetric connection fittings.The casting resin body partly is made up of two cap shapes, and wherein each cap shape partly has two sections that the diameter difference is very big, in the section of minor diameter is inserted large diameter section.This design forms big leakage distance and also form long especially striking distance in insulating material under the less situation of axial length.In addition, hollow design can be saved material (DE 2142119B1).

Known in addition post insulator is used for being in the high-tension apparatus supporting of encapsulation the conductor of high-voltage, these insulators have a groove in the zone of its joint face, groove is provided with in conductive layer and the groove metal closures is housed, and a bolt that is used for fixing this conductor is housed in the metal closures.Wherein the setting of metal closures and conductive layer be used to reduce voltage gradient near the key area that is in insulator and the conductor coupling portion position (CH512810, Fig. 2).

Also known a kind of support insulator, bearing as bearing that is used for the cable socket fixture and electric equipment (as switch), its the most handy thermoplastics (as polyamide) is made and structurally by two the pipe that is nested each other is set at interval and forms, and these two pipes are connected with cross wall by vertical web radially.Insert the screw-thread bush of metal in the end of interior pipe, they are used for being fixed on support insulator on the base and being used to install accessory and equipment.The height of this support insulator is decided according to the voltage that specifically applies.Therefore this support insulator has a top and a bottom joint face, and wherein, the end of two pipes and web constitute a joint face, and contains three cavitys (DD 68546) that extend vertically in the inside of outer tube.

In the known support insulator made from casting resin of another kind, being embedded in the top is the straight pin with the bulb that is connected up with the susceptor design that the bottom is used for connection fittings.In at least one insulator of can inwardly packing in two this bearings, to improve the anti-fracture strength (DE1755456U) of support insulator with offsetting.

Summary of the invention

From a kind of like this insulator (DD 68546), promptly, a kind of part that is used for high voltage switchgear is in high-voltage is bearing in an insulator that is on earthy supporting member, it is made of a casting resin body, this casting resin body is divided into bonding pad and a following bonding pad and a central area that is connected these two bonding pads, be respectively equipped with the rotational symmetric connection fittings of a metal in ground connection side and high-pressure side, and be provided with at least one cavity at central area, the objective of the invention is to the structural design of insulator is done following simplification, making it has high as far as possible compressive resistance under highly less situation.

The object of the present invention is achieved like this, that is, the casting resin body has the shape of the rectangular parallelepiped of profile cavetto, wherein

-central area is made up of two walls that are arranged in the side,

-two connection fittings are designed to surface electrode and imbed in two bonding pads, and

-two connection fittings constitute the smooth joint face in upper and lower respectively.

So the outstanding part of the insulator of design be that high compressive resistance is arranged when less height is arranged, low material consumption and be convenient to produce.The surface electrode that is preferably flat dome shape has been avoided in the big voltage gradient of electrode surface.Have two this moulding that are arranged in the wall of side by central area, an air chamber is provided in the zone between two electrodes, it causes a kind of casting resin-gas-casting resin-dielectric, and thereby causes the dielectric off-load of casting resin in the narrowest electrode spacing district.What conform with purpose can be to make wall outwards arched for this reason.For example can be near the casting resin body in this external this air chamber zone for the purpose that cleans.Also have, connect two bonding pads of containing electrode by wall and avoided the casting resin cohesion, this casting resin cohesion can tend to form shrinkage cavity when cooling in manufacture process.In wall, adopt the through hole of window-like can further reduce the consumption of material in case of necessity.For this novel insulator and concrete dielectric situation are adapted, this casting resin body can also be established outside and/or inner rib or establish and be parallel to the midfeather that two joint faces extend in the zone of two walls.

Insulator by the present invention's design both can be fulfiled the bearing insulation subfunction, can be used for transfer torque simultaneously again.In the equipment that it both can be applicable to encapsulate, can be applicable in the air again.

Description of drawings

At 4 embodiment of this novel insulator shown in Fig. 1 to 6, in the accompanying drawing:

Fig. 1 to 3 is respectively sectional arrangement drawing and the cross-sectional view and the vertical view of first kind of insulator;

Fig. 4 illustrates second kind of insulator, and it has the rib in the zone that is located at wall;

Fig. 5 illustrates the third insulator, and it has set midfeather in the zone of wall;

Fig. 6 illustrates the vertical section of the 4th kind of insulator, and it has the window that is located in the wall.

Embodiment

Fig. 1 to 3 represents insulator 1 by different views, and it is made up of casting resin body 2 and top connection fittings 3 and bottom connection fittings 4.Casting resin body 2 has the rectangular parallelepiped contour shape of cavetto basically, and is divided into bonding pad, top 10, bonding pad, bottom 11 and is arranged in the central area that

side wall

12 and 13 is opposite one another formed by two.These two are designed to rotational symmetric connection fittings 3 and 4 and at first constitute the flat joint face in upper and lower 23,24, in addition constitute the

electrode

25,26 of a flat dome shape respectively.Each connection fittings is imbedded in the affiliated bonding pad of casting resin body with flushing.By by two

walls

12 and 13 central areas that constitute, an air chamber 5 is being arranged as the insulator central authorities between two connection fittings 3 and 4 of electrode.

In pressing the insulator of Fig. 4, in the zone of

wall

14 and 15, be shaped on an external fin 16 and an internal-rib 17 respectively, so that prolong the leakage path between two connection fittings that are in different potentials.

In pressing the insulator of Fig. 5, between two walls 19 and 20, establish the midfeather 18 of a level.

In pressing the insulator of Fig. 6, in the wall 21 that is arranged in the side, establish window-like through hole 22.

Claims

1. a part that is used for high voltage switchgear is in high-voltage is bearing in an insulator that is on earthy supporting member, it is made of a casting resin body, this casting resin body is divided into the bonding pad, (10) and following bonding pad, (11) with a central area that is connected these two bonding pads, be respectively equipped with the rotational symmetric connection fittings of a metal in ground connection side and high-pressure side, and be provided with at least one cavity at central area, it is characterized in that: the casting resin body, (2) has the rectangular parallelepiped shape of profile cavetto, wherein

-central area is made up of two walls that are arranged in the side;

-two connection fittings (3,4) are designed to surface electrode (25,26) and imbed in two bonding pads; And

-two connection fittings constitute the joint face (23) of upper planar and the joint face (24) of lower flat respectively.

2. according to the described insulator of claim 1, it is characterized in that: described wall is outwards arched.

3. according to claim 1 or 2 described insulators, it is characterized in that: described casting resin body is provided with the rib (16) of an outside and/or the rib (17) of an inside in the zone of two walls.

4. according to claim 1 or 2 described insulators, it is characterized in that: described casting resin body is provided with one and is parallel to the midfeather (18) that joint face extends in the zone of wall.

5. according to claim 1 or 2 described insulators, it is characterized in that: the wall of described casting resin body (21) is provided with the through hole (22) of window-like.

6. according to claim 1 or 2 described insulators, it is characterized in that: described electrode (25,26) has the shape of flat dome.