CN2334093Y

CN2334093Y - Short-circuit protection

Info

Publication number: CN2334093Y
Application number: CN 98228316
Authority: CN
Inventors: 丑伦忠; 柳树; 吴良佐
Original assignee: ZHONGHE ELECTRIC APPLIANCE FACTORY GUIYANG
Current assignee: ZHONGHE ELECTRIC APPLIANCE FACTORY GUIYANG
Priority date: 1998-02-19
Filing date: 1998-02-19
Publication date: 1999-08-18
Anticipated expiration: 2008-02-19

Abstract

The utility model relates to a short circuit protector, comprising a casing, a hollow spiral pipe coil (1) and an insulating support frame (6) provided with a contact (5), wherein, the hollow spiral pipe coil (1) is arranged on a fixing iron core (2), the insulating support frame (6) is installed on a moving iron core (3), and a supporting spring (4) is arranged on the moving iron core (3). The utility model uses the methods of increasing the iron core and reducing the magnetic circuit reluctance, the speed of the coil driving the contact is accelerated, the action sensitivity does not exceed 0.002 seconds, a power supply of a return circuit can be cut at the initial rising stage of short circuit current, and the harm from the electric arc and the short circuit current of a fault point to the line is weakened. The utility model has the advantages of simpler structure, low cost, and high reaction rate. The utility model can be used for being used as short circuit protection in an electric line.

Description

A kind of short-circuit protector

The utility model relates to the short-circuit protection in a kind of circuit, protective device that can the fast shut-off ring current when particularly a kind of circuit is short-circuited.

In electric wiring, short trouble happens occasionally.At present, the short-circuit protection that uses in the circuit mainly still is fuse and air switch, but these two kinds of electrical equipment all exist problem of slow response when implementing short-circuit protection, and general operate time was greater than 0.1 second.And when short trouble takes place, short circuit current can reach kiloampere approximately in 0.1 second, can make the fault point produce very strong electric arc, personnel and equipment are damaged, short circuit current is also very big to the infringement of electric wiring, it can quicken the aging of line insulation even cause the circuit catching fire, and in fact many fire cause because of short circuit causes that circuit is on fire.

The purpose of this utility model is: provide that a kind of structure is simple, cost is lower, reaction speed is fast, the short-circuit protection of good practical effect.

Formation of the present utility model: include housing, hollow magnetic plug (1), the insulating support (6) of contact (5) is housed; It is characterized in that: coil (1) is contained on the secured core (2), and insulating support (6) is contained on the movable core (3), and support spring (4) is housed on the movable core (3).

In the above-mentioned short-circuit protector, in order fully to reduce the magnetic circuit magnetic resistance, described secured core (2) and movable core (3) preferably are the mountain font.

Compared with the prior art, the utility model utilizes air switch to adopt hollow magnetic plug to drive the principle of tripping mechanism, has structurally increased iron core, by reducing the method for magnetic circuit magnetic resistance, makes the speed of coil drive contact action accelerate greatly.Action sensitivity reaches and is no more than 0.002 second, can the cut-off loop power supply in starting stage that short circuit current rises, weakened the harm of the electric arc of fault point and short circuit current greatly to circuit.Have that structure is simple, cost is lower, reaction speed is fast, the characteristics of good practical effect.Can be widely used in doing in the electric wiring short-circuit protection uses.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Accompanying drawing 1 is an organigram of the present utility model;

Do not comprise housing in the structure shown in the accompanying drawing 1, hollow magnetic plug (1) is contained on the medial post of chevron secured core (2), movable core (3) places the top of secured core (2), support spring (4) by movable core (3) medial post makes between movable core (3) and the secured core (2) and keeps certain interval, and the insulating support (6) that contact (5) are housed is fixed on the movable core (3).When being short-circuited fault, the rapid adhesive movable core in magnetic field (3) that hollow magnetic plug (1) produces, movable core (3) makes the moving contact of contact (5) separate with fixed contact by insulating support (6), reaches the purpose of cut-off loop power supply.

Through the reality test, the utility model action sensitivity can reach and be no more than 0.002 second.Contact of the present utility model is reusable and scaling loss does not take place under the condition that does not add any arc extinguishing measure.

Claims

1, a kind of short-circuit protector includes housing, hollow magnetic plug (1), the insulating support (6) of contact (5) is housed; It is characterized in that: hollow magnetic plug (1) is contained on the secured core (2), and insulating support (6) is contained on the movable core (3), and support spring (4) is housed on the movable core (3).

2, according to the described short-circuit protector of claim, it is characterized in that: described secured core (2) and movable core (3) are the mountain font.