CN201230151Y

CN201230151Y - Electric field shielding construction for 35kV contact box

Info

Publication number: CN201230151Y
Application number: CNU2008201479456U
Authority: CN
Inventors: 刘军超; 娄军锋
Original assignee: Henan Senyuan Electric Co Ltd
Current assignee: Henan Senyuan Electric Co Ltd
Priority date: 2008-07-14
Filing date: 2008-07-14
Publication date: 2009-04-29
Anticipated expiration: 2018-07-14

Abstract

The utility model discloses an electric field-shielding structure of a 35kV contact box. The electric field-shielding structure comprises a big circular ring (7), a small circular ring (11), a circular flat plate (9) with a hole in the middle and a plurality of round bars (8, 10), which can conduct electricity but not magnetism; wherein, the small circular ring (11), the circular flat plate (9) and the round bars (10) are tightly welded; the small circular ring (11) is concentric with the circular flat plate (9); the planes of the small circular ring (11) and the circular flat plate (9) are parallel to each other; the plane of the circular flat plate (9) is slightly higher than the plane of the small circular ring (11); the big circular ring (7), the small circular ring (11) and the round bars (8) are tightly welded; the big circular ring (7) is concentric with the small circular ring (11); the planes of the big circular ring (7) and the small circular ring (11) are parallel to each other; and the round bars (8) are connected with and support the big circular ring (7) and the small circular ring (11). When the electric field-shielding structure is assembled, a bolt passes through a fixed contact (1) and a busbar (4) to fix the electric field-shielding structure (3) on a contact box insert (5). The electric field-shielding structure can ensure that the electric field of the contact box can be uniformly distributed, thus increasing electric breakdown strength and service life of insulating material, the structure is simple, and the production cost is low.

Description

A kind of electric field shielding structure of 35kV contact box

Technical field

The utility model relates to a kind of electric field shielding structure of contact box, and is special relevant with a kind of electric field shielding structure of 35kV contact box, belongs to electrical technology field.

Background technology

Contact box is one of insulating part main in the electrical power distribution switches cabinet, and its safe operation is the assurance of safe operation of power system.Traditional 35kV contact box does not have electric field shielding, after the busbar overlap joint is fixed to contact box inside, be equivalent to a wedge angle in busbar corner, this wedge angle Electric Field Distribution is more concentrated, the busbar wedge angle can be to the discharge of contact box inwall in the long-time running process, and long-term discharge finally can cause contact box breakdown.Present improved contact box is to adopt the thickening of minor insulation material, perhaps adopts the compound inslation method, and purpose is to reduce the electric field strength that insulating material bears, and has so not only increased manufacturing cost, and has increased manufacture difficulty.

The utility model content

The purpose of this utility model is to design a kind of shielding construction of the 35kV contact box internal electric field that can evenly distribute.

The technical solution of the utility model is: this electric field shielding structure is a grading ring that the conduction non-magnet material constitutes, and is made up of large circle, small circle ring, middle porose round flat board and some poles.Small circle ring is fastening with circle flat board and the welding of some poles, the with one heart dull and stereotyped and plane parallel of small circle ring and circle, and the circle plate level is a little more than the small circle ring plane; Large circle and small circle ring and the welding of some poles are fastening, the concentric and plane parallel of large and small annulus, the large and small annulus of pole support and connection.

During the assembling of the 35kV contact box electric field shielding structure that the utility model provides and contact box, pass fixed contact and busbar is fastened on shielding construction on the contact box inserts together by bolt.The large circle of shielding construction and small circle ring and busbar are idiostatic, it is the electrode of contact box internal high pressure electrified body radius of curvature maximum, the wedge angle that has contained busbar, Electric Field Distribution is even, improved the puncture voltage of insulating material, make its under rated voltage no longer to contact box discharge, improved contact box useful life, and simple in structure, production cost is low.

Description of drawings

Fig. 1 is the structural representation of existing minor insulation material thickening contact box;

Fig. 2 is the structural representation of an embodiment of electric field shielding structure of the utility model 35kV contact box;

Fig. 3 is the mounting structure schematic diagram that is assembled in the 35kV contact box embodiment illustrated in fig. 2.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

Among the figure: 1, fixed contact 2, bolt 3, electric field shielding structure 4, busbar 5, contact box inserts 6, contact box 7, large circle 8, pole 9, circle flat board 10, pole 11, small circle ring

As shown in Figure 2, the utility model electric field shielding structure 3 is the grading rings that the conduction non-magnet material constitutes, and is made up of large circle 7, small circle ring 11, middle porose circle dull and stereotyped 9 and some poles 8,10.Small circle ring 11 is fastening with circle

flat board

9 and 10 welding of some poles, small circle ring 11 and circle dull and stereotyped 9 concentric and plane parallel, and dull and stereotyped 9 planes of circle are a little more than small circle ring 11 planes; Large circle 7 is fastening with

small circle ring

11 and 8 welding of some poles, large circle 7, small circle ring 11 concentric and plane parallel, and pole 8 connects support large circles 7, small circle ring 11.

In mounting structure schematic diagram shown in Figure 3, bolt 2 passes fixed contact 1 and busbar 4 is fastened on shielding construction 3 on the contact box inserts 5 together.The large circle 7 of shielding construction 3 and small circle ring 11 are idiostatic with busbar 4, it is the electrode of contact box 6 internal high pressure electrified body radius of curvature maximums, the wedge angle that has contained busbar 4, Electric Field Distribution is even, improved the puncture voltage of insulating material, make its under rated voltage no longer to contact box 6 discharge, improved 6 useful lifes of contact box, simple in structure, production cost is low.

Claims

1, a kind of electric field shielding structure of 35kV contact box is characterized in that: be a grading ring that the conduction non-magnet material constitutes, be made up of large circle (7), small circle ring (11), middle porose circle dull and stereotyped (9) and some poles (8,10); Small circle ring (11) is fastening with round dull and stereotyped (9) and some poles (10) welding, small circle ring (11) and the concentric and plane parallel of circle dull and stereotyped (9), and dull and stereotyped (9) plane of circle is a little more than small circle ring (11) plane; Large circle (7) and small circle ring (11) and some poles (8) welding are fastening, large circle (7), small circle ring (11) with one heart and plane parallel, pole (8) connects support large circle (7), small circle ring (11).