CN103427359A

CN103427359A - 40.5kV steel-clad movable-type indoor alternating current metal-enclosed switchgear

Info

Publication number: CN103427359A
Application number: CN2013103938936A
Authority: CN
Inventors: 刘洋; 司贞员; 曹宏; 胡占楼; 宋浩
Original assignee: Henan Senyuan Electric Co Ltd
Current assignee: Henan Senyuan Electric Co Ltd
Priority date: 2013-09-03
Filing date: 2013-09-03
Publication date: 2013-12-04

Abstract

The invention discloses a 40.5kV steel-clad movable-type indoor alternating current metal-enclosed switchgear. A breaker 6 can slide in a guide rail 7 of a cabinet frame 1. A moving contact 5 is mounted on the breaker 6. A wall bushing 12 is fixedly mounted on the cabinet frame 1 which is used for supporting and installing a vertical type current bus 10. Each current item comprises two contact boxes 3 which are fixedly mounted on the cabinet frame 1 in a vertical mode, wherein terminals 2 are embedded inside the contact boxes 3, one end of each terminal 2 is connected with the vertical type current bus 10, and the other end of each terminal 2 is used for fixing a static contact 4. A current transformer 9 is fixed on the lower rear portion of the cabinet frame 1, and a terminal 11 of the current transformer 9 is connected with the terminals 2 of the contact boxes 3 below the current transformer 9 through the vertical type current bus 10. The 40.5kV steel-clad movable-type indoor alternating current metal-enclosed switchgear has the advantages of guaranteeing that the air insulation clear distance is not shorter than 30mm, the internal arcing level reaches an IAC level, and the magnitude of partial discharge of a whole cabinet is not higher than 50pC at the testing voltage which is 1.1 times of nominal voltage.

Description

The indoor ac metal closing switch gear of a kind of 40.5kV armored withdraw type

Technical field

What the present invention relates to is the indoor ac metal closing switch gear of a kind of 40.5kV armored withdraw type, belongs to the voltage switch equipment technical field.

Background technology

Along with the development of China's urban and rural power grids capacity-increasing transformation promotion of item and electric power network grows, electricity market constantly increases the demand of high technology content, high-quality switchgear.In recent years under the policy of China's development equipment manufacture, the designing and manufacturing level of China's high voltage switchgear is also improving year by year, the designing and manufacturing level of simultaneously more external famous brand names is also improving year by year, and abroad some esbablished corporations are also strengthening Chinese Electricity Market Competition dynamics.In the face of domestic and international switch industry development situation, the competitive pressure in market grows with each passing day.The demand of electricity market not only shows quantitatively, but also shows on high-quality, the high reliability of product.

Through technology transfer and self-developing for many years, the 40.5kV switchgear of China has obtained very large progress on technical merit, but at high parameter, high-performance, large current product, slower development in the miniaturization of high parameter, high-performance, large electric current particularly.National grid has been promulgated respectively trial version and the revised edition of " 18 great anti-accident measures of electrical network of State Grid Corporation of China " at 2005,2012, all the 40.5kV switchgear has been proposed to explicitly call for, for example the air insulation clear distance is not less than 300mm, IAC AFLR arcing grade etc.But at present,, the 40.5kV switchgear that meets its requirement not yet has report.

Summary of the invention

What the present invention proposed is the indoor ac metal closing switch gear of a kind of 40.5kV armored withdraw type, its objective is at the assurance switchgear wide in the 1400mm situation at existing cabinet, meet the air insulation clear distance and be not less than 300mm, the alternate air insulation clear distance over the ground that reaches all is not less than 300mm; Inner arcing grade meets IAC level (AFLR-31.5kA-0.8s), to guarantee equipment operator's safety; Under the test voltage of 1.1 times of rated voltages, the partial discharge quantity of switchgear is not more than 50pC.And switchgear should have preferably technical parameter and electric and mechanical performance preferably, guarantee fail safe, the reliability and stability of switchgear operation.

Technical solution of the present invention: the indoor ac metal closing switch gear of a kind of 40.5kV armored withdraw type, comprise tank bracket, circuit breaker summation current transformer, it is characterized in that: the front bottom of tank bracket is fixed with two horizontal C type guide rails, roller is equipped with in the circuit breaker bottom, roller is located on C type guide rail, and moving contact is installed on circuit breaker; Be fixed with wall bushing on tank bracket, and, for supporting and install the vertical current bus of horizontal direction, the vertical current bus adopts rectangular bus bar; Each electric current item is provided with two contact boxs, the upper and lower of contact box is fixedly mounted on tank bracket, contact box inside is embedded with binding post, binding post one end is connected with the vertical current bus, the other end of binding post is fixed with fixed contact, rear lower at tank bracket is installed with current transformer, and current transformer connecting terminal is connected with the binding post in lower contact box by the vertical current bus.

Advantage of the present invention: 1) metal armoured design, what cabinet adopted high-quality covers aluminium zinc steel plate, after double bending, adopts high-strength bolt to connect assembled, the C type guide rail that circuit breaker supports and travels, guaranteed the enforcement of the moving-out type technology of switchgear, and cost can reach and minimizes; 2) contact box and wall bushing adopt the shielding structure design, inside are provided with gauze screen, and adopt the inside and outside umbrella skirt construction design of formula straggly, have increased creepage distance, and the anti-soil that has improved switchgear dodges ability, and has guaranteed enough little partial discharge quantity; 3) in the cabinet that has limited switchgear wide (1400mm) situation, changed under the project organization and mounting structure of the conduction part of electric current, guaranteed that the air insulation clear distance is not less than 300mm, the alternate air insulation clear distance over the ground that reaches all is not less than 300mm; Inner arcing grade has reached IAC level (AFLR-31.5kA-0.8s); And, under the test voltage of 1.1 times of rated voltages, the partial discharge quantity of whole cabinet is not more than 50pC.Improve switchgear safety in operation, reliability and stability, and effectively reduced manufacturing cost.

The accompanying drawing explanation

Fig. 1 is that the indoor ac metal closing switch gear embodiment of 40.5kV armored withdraw type of the present invention is positioned at the structural representation of isolation/test position at circuit breaker.

Fig. 2 is the structural representation that is positioned at service position at circuit breaker embodiment illustrated in fig. 1.

In figure 1 is tank bracket, the 2nd, binding post, the 3rd, contact box, the 4th, fixed contact, the 5th, moving contact, the 6th, circuit breaker, the 7th, guide rail, the 8th, roller, the 9th, current transformer, the 10th, vertical current bus, the 11st, current transformer connecting terminal, the 12nd, wall bushing.

Embodiment

Express an indoor ac metal closing switch gear of 40.5kV armored withdraw type in Fig. 1 and Fig. 2, wherein omitted side plate parts, but only meaned for the received current conduction portion support tank bracket 1 with the circuit breaker 6 of withdraw-type.

As shown in drawings, the indoor ac metal closing switch gear of a kind of 40.5kV armored withdraw type, its structure comprises tank bracket 1, circuit breaker 6 summation current transformers 9, be fixed with the C type guide rail 7 of two horizontal arrangement in the front bottom of tank bracket 1, roller 8 is equipped with in circuit breaker 6 bottoms, roller 8 can slide in C type guide rail 7, and moving contact 5 is installed on circuit breaker 6.Fixed installation wall bushing 12 on tank bracket 1, and for supporting and install the vertical current bus 10 of horizontal direction.Each electric current item is provided with two contact boxs 3, contact box 3 is fixedly mounted on tank bracket 1 up and down, contact box 3 inside are embedded with binding post 2, binding post 2 one ends are connected with vertical current bus 10, the other end is fixed contact 4 fixedly, binding post 2 is vertical plane with joint face and the binding post 2 of vertical current bus 10 with the joint face of fixed contact 4, and the line mode of contact box 3 is vertical line mode.Rear lower at tank bracket 1 is installed with current transformer 9, and current transformer connecting terminal 11 is connected with the binding post 2 of lower contact box 3 by vertical current bus 10.

During work, when circuit breaker 6 sails switchgear into along guide rail 7, only work as circuit breaker 6 in position shown in Fig. 1, be isolation/test position, can realize maintenance and the test adjustment of switchgear.Continue to travel along guide rail 7 at circuit breaker 6, only work as circuit breaker 6 in position shown in Fig. 2, be service position, the moving contact 5 of its switchgear is connected with fixed contact 4; Now, the normal occlusion of circuit breaker 6 divides, and can realize conducting and the disconnection of whole current circuit in switchgear, i.e. current supply circuit through and off.

Claims

1. the indoor ac metal closing switch gear of 40.5kV armored withdraw type, comprise tank bracket, circuit breaker summation current transformer, it is characterized in that: the front bottom of tank bracket is fixed with two horizontal C type guide rails, roller is equipped with in the circuit breaker bottom, roller is located on C type guide rail, and moving contact is installed on circuit breaker; Be fixed with wall bushing on tank bracket, and, for supporting and install the vertical current bus of horizontal direction, the vertical current bus adopts rectangular bus bar; Each electric current item is provided with two contact boxs, the upper and lower of contact box is fixedly mounted on tank bracket, contact box inside is embedded with binding post, binding post one end is connected with the vertical current bus, the other end of binding post is fixed with fixed contact, rear lower at tank bracket is installed with current transformer, and current transformer connecting terminal is connected with the binding post in lower contact box by the vertical current bus.

2. the indoor ac metal closing switch gear of a kind of 40.5kV armored withdraw type according to claim 1, it is characterized in that the joint face of described binding post and vertical current bus and the joint face of binding post and fixed contact are vertical plane, the line mode of contact box is vertical line mode.