CN2264957Y

CN2264957Y - Current transformer for switch cubicle

Info

Publication number: CN2264957Y
Application number: CN 96240842
Authority: CN
Inventors: 周秉时; 杨润友; 魏厚坤
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-17
Filing date: 1996-09-17
Publication date: 1997-10-15
Anticipated expiration: 2006-09-17

Abstract

The utility model relates to a current mutual inductor for a low-voltage switch cabinet, composed of a casing, an iron core, and a winding. A convex master-row perforation is arranged in the center of the casing; the iron core which is provided with a secondary winding is sheathed and fixed on an insulating layer at the inner side of a casing of the convex master-row perforation; both ends of the secondary winding which penetrates through a winding outlet on the casing is connected with load. The utility model has the advantages of simple structure, convenient installation and use, high hardiness and durability, long service life, low cost, and bright prospect of popularization and application.

Description

The cabinet Current Transformer

The utility model relates to a kind of cabinet Current Transformer of installing and using on switch cubicle.

Current transformer is to be used for the measuring range of extend current, electric energy, power etc. and the measuring equipment of used for relay protection.At present, mostly the current transformer of using in the domestic switch cubicle is to adopt the unsaturated-resin pouring to form, its center hole adopts circle more, shell has two legs outward, and the domino low-tension switch cabinet that widely adopts at present, the installation of instrument transformer in cabinet will be adopted and add support and fixedly spiral shell inspection, both bothered, expense is high again, and aging along with unsaturated-resin, produces breach and makes accuracy of instrument transformers and decreasing insulating, influence result of use widely, can not guarantee safe handling.

The purpose of this utility model is exactly to provide a kind of novel cabinet Current Transformer at the actual needs of above-mentioned situation and switch cubicle.

The purpose of this utility model is to realize like this, after iron core is twined with insulating barrier, around last secondary winding; again around a protective layer; the protruding endoporus of shell has insulating barrier outward, and the convex endoporus external fixation that the iron core sleeve of band winding is contained in the middle of the shell blocks, and tightly gets final product with special glue is bonding.

The utility model is simple in structure, and is easy to install, solid attached usefulness, and the life-span is long, and cost is low, is one of existing cabinet Current Transformer is improved greatly, and popularizing application prospect is wide.

Below in conjunction with accompanying drawing structure of the present utility model is elaborated.

Fig. 1 is a shell front view of the present utility model.

Fig. 2 is shell section figure of the present utility model.

Fig. 3 is a structure cutaway view of the present utility model.

Fig. 4 is a working circuit diagram of the present utility model.(consider shown in the line and be the utility model installation site).

By shown in Figure 3, the utility model is to be made of shell, iron core winding and the perforation of convex busbar, secondary winding 2 is wound on the iron core 1 of tape insulation layer, the convex busbar at the shell 4 centers 3 shell inner faces of boring a hole have insulating barrier 5, the iron core sleeve of band secondary winding 2 is contained in the convex busbar and bores a hole fixing above the 3 shell inner face insulating barriers 5, the winding line outlet 7 of secondary winding 2 two ends on shell 4 drawn, and is used to connect load Y.

Secondary winding 2 is formed by the coiling of multiply enamelled wire, its number of turn is that basis is to change according to electric current to select different numbers of ampere turns than difference, iron core 1 adopts that high magnetic is cold rolling to be had oriented silicon steel band to roll to form, the requirement different according to size of current, iron core can be designed to garden annular and rectangle, and shell 4 is made by poly-carbon plastics.Chang Yong LMK3-0.66 type 200A/5A0.2 level current transformer for example, iron core adopts φ 45 * 75 * 30mm cold-rolled silicon steel tape to make, more than magnetic Mi Keda 18000 Gausses, can add two gardens ring magnetic shunts and a circle short-circuited conducting sleeve in case of necessity and make error compensation, secondary winding around 39 circles, is adjusted its error with the transducer check device with 4 strands of enamelled wires, makes it meet 0.2 grade of requirement, the iron core sleeve of band winding is contained in the housing of poly-carbon shell middle part convex busbar perforation 3, and bonding good with poly-carbon paste.

Easy to install and use for it, shell 4 is made of upper and lower two parts, and the outside has location notch 6 and a winding polarity mark Line outlet secondary polarity mark

It is to be noted, the utility model is specially adapted on the domino low-tension switch cabinet (screen), because adopt 3 convex busbars perforation window, can make current transformer be directly installed on also to locate on the busbar by the busbar perforation blocks, improve existing current transformer effectively and installed and fixed very inconvenient shortcoming, and solid attached usefulness, anti-bump fall, fire-retardant, cost is low, be widely used, its economic and social benefit is huge.

Claims

1, a kind of cabinet Current Transformer that constitutes by iron core and secondary winding, secondary winding is wound on the iron core of tape insulation layer, convex busbar perforation (3) the shell inner face that it is characterized in that shell (4) center has insulating barrier (5), the iron core (1) of band secondary winding (2) is sleeved on above convex busbar perforation (3) shell inner face insulating barrier (5) fixing, and the winding line outlet (7) of secondary winding (2) two ends on shell (4) drawn.

2, cabinet Current Transformer according to claim 1 is characterized in that said shell (4) is to be made of upper and lower two parts, and the outside has location notch (6).

3, cabinet Current Transformer according to claim 1 and 2 is characterized in that said shell (4) is to be made by poly-carbon plastics.