CN2171152Y

CN2171152Y - Dry type casing current mutual-inductor

Info

Publication number: CN2171152Y
Application number: CN 93234812
Authority: CN
Inventors: 周干国; 龙爱连
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-11
Filing date: 1993-10-11
Publication date: 1994-07-06
Anticipated expiration: 2003-10-11

Abstract

The utility model relates to a dry type current mutual inductor with sleeve pipes. The utility model is composed of an iron core [3], a secondary winding group [7], a conducting bar [1] and sleeve pipes [2] and [5], wherein, the sleeve pipes and a major insulator are integrated into a whole. The iron core [3] and the secondary winding group [7] are sealed in the sleeve pipes. The utility model has the advantages of good insulating performance and easy manufacture. The conducting bar and a support column on electrical equipment serve as primary winding groups. The utility model also has the advantages of low cost, small volume, light weight and compact structure. Each sleeve pipe is composed of an upper sleeve pipe and a lower sleeve pipe, and is convenient to install, maintain and replace. The utility model can be used on an electrical power system of 10kV to 500 k V and is especially suitable for outdoor use.

Description

Dry type casing current mutual-inductor

The utility model relates to a kind of AC current transformer of dry type.

Before the utility model is finished, as the patent No.: 92217861.5 described " built-in casing current transformers ", the current transformer that adopts the ambroin film to make main insulating layer is installed in the sleeve pipe cavity, and establishes lid in the end of sleeve pipe.This technology winding plastic film on conducting rod is made main insulating layer, the manufacturing process complexity, require very highly, in winding process, between film and the film, unavoidably can produce air gap, next step operation bonding, the filling epoxy resin compound all can not be eliminated all air gaps, and this air gap under high pressure just may produce partial discharge, can not bear the 42KV industrial frequency withstand voltage and cause puncture, more can not bear the 75KV lightning impulse.The product main performance does not reach requirement, does not ensure.In the outdoor application process, rainwater may be penetrated into main insulating layer and current transformer along conducting rod, also influences the insulating properties of product.Moreover casing cover is located at the end, behind the current transformer of packing into, stick with glue into a body, behind the electric equipment of, change defeated, electric power system when packing into, the current transformer on the six sulfur oxide switches especially, when current transformer or conducting rod have fault, there is not dismounting to cause and reports damage with electric equipment.

The purpose of this utility model provides a kind of easy to manufacture, good insulation preformance, the dry sleeve current transformer that current transformer that interchangeability is good and sleeve pipe are integrated.

The utility model realizes that with the following methods it is made of iron core, secondary winding, conducting rod (winding) and sleeve pipe.Sleeve pipe is made sleeve pipe and setting of casing by insulating material, last sleeve pipe is two layers, internal layer is a through hole device conducting rod, skin is the sleeve column under shed, interior device iron core, secondary winding, its complementary space fill insulant is provided with the secondary leading-out terminal on sleeve pipe, cased top coincide with last sleeve pipe and is connected, and the below is connected with electric equipment.Upper sleeve body is the insulating material global formation, and the internal layer through hole is as main insulating layer, and main insulating layer inside does not have the pore air gap, electric discharge phenomena can not take place, and its insulating properties is a lot of by force than film.Iron core, secondary winding are sealed in the last sleeve pipe that Open Side Down by packing material and last sleeve pipe coiled integral body, can prevent destructions such as any pollution, rainwater.Setting of casing and electric equipment are affixed, and last sleeve pipe is connected with setting of casing by conducting rod.When current transformer or conducting rod break down, detachably check, change.

The utlity model has: good insulation preformance, the material-saving economize on electricity, volume is little, in light weight, easy to manufacture, uses easy to maintenance.The key technical indexes reaches industrial frequency withstand voltage 42KV, 5 minutes; Partial discharge is less than 20PC; Thunder and lightning all-wave surge voltage 75KV; Wet examination did not have the road of sudden strain of a muscle and puncture in withstand voltage 30KV5 minute; 0.2 grade of accurate measurement level, 5P level, 10P level.

Fig. 1 is the utility model structural representation;

Further specify the utility model below in conjunction with accompanying drawing:

This current transformer is made of iron core ［ 3 ］, secondary winding ［ 7 ］, conducting rod ［ 1 ］ and sleeve pipe.Sleeve pipe adopts the moulding of insulating material HTHP, and sleeve pipe is that last sleeve pipe ［ 2 ］ and setting of casing ［ 5 ］ are formed.Last sleeve pipe ［ 2 ］ external form is a multilayer umbrella disk and cylindrical.Umbrella disk is for increasing creep distance and being convenient to heat radiation.Last sleeve pipe ［ 2 ］ inside is two layers, and ground floor is a winding conducting rod of a round tube hole device ［ 1 ］, and the second layer is an annulus post under shed, wherein installs iron core ［ 3 ］, secondary winding ［ 7 ］, and composite insulating material is filled in its complementary space cast.Last sleeve pipe ［ 2 ］ is provided with secondary leading-out terminal ［ 8 ］.Last sleeve pipe lower end pours into the rack saw shape with composite insulating material, increases its creep distance.

Be fixing of reinforcing sleeve and electric equipment, last sleeve pipe ［ 2 ］ has three holders ［ 4 ］, by supporting ［ 9 ］ sleeve pipe and electric equipment is fixed.

Setting of casing ［ 5 ］ external form is a cylinder boss shape, and there is a through hole inside and is provided with the face of cylinder that coincide with last sleeve pipe.The bottom is fixedly mounted on the electric equipment, and boss ［ 10 ］ is that sleeve pipe on the positioning supports ［ 2 ］ is set.

On the utility model shell, evenly paste one deck and have the adhesion strength height, the soft shape material of no air gap makes it have self-cleaning ability under the effect of wind-force rainwater, the characteristic that surface leakage is very little.

The utility model assembly manipulation process is: at first setting of casing ［ 5 ］ is fixed on the electric equipment, loads onto sleeve pipe ［ 2 ］, insertion conducting rod ［ 1 ］ is also tightened.At the tight nut of conducting rod ［ 1 ］ end band, sleeve pipe is pressed on the electric equipment.By supporting ［ 9 ］, holder ［ 4 ］ is strengthened fixing then.Anti-its road capable it, promptly disassemble, can keep in repair, change.

Claims

1, a kind of dry sleeve current transformer, it is made of iron core, secondary winding, conducting rod, sleeve pipe, it is characterized in that: sleeve pipe is made sleeve pipe [2] and setting of casing [5] by insulating material, last sleeve pipe [2] is two layers, internal layer is a through hole device conducting rod [1], skin is the sleeve column under shed, interior device iron core [3], secondary winding [7], its complementary space fill insulant, on sleeve pipe, be provided with secondary leading-out terminal [8], the top of setting of casing [5] coincide with last sleeve pipe [2] and is connected, and the below is connected with electric equipment.

2, current transformer according to claim 1 is characterized in that: going up sleeve pipe ［ 2 ］ external form is multilayer umbrella disk and cylindrical.

3, according to claim 1,2 described current transformers, it is characterized in that: go up sleeve pipe ［ 2 ］ lower end and pour into the rack saw shape with composite insulating material.

4, current transformer according to claim 2 is characterized in that: going up on the sleeve pipe ［ 2 ］ has three holders ［ 4 ］.

5, current transformer according to claim 2 is characterized in that: setting of casing ［ 5 ］ external form is a cylinder boss shape, and there is a through hole inside, and is provided with the face of cylinder that coincide with last sleeve pipe.

6, current transformer according to claim 2 is characterized in that: evenly paste one deck soft elastic material on the sleeve shell.