CN103474956A

CN103474956A - Leakage protector with judgment function

Info

Publication number: CN103474956A
Application number: CN2013104064900A
Authority: CN
Inventors: 郁彬
Original assignee: KUNSHAN AODELU AUTOMATION TECHNOLOGY Co Ltd
Current assignee: KUNSHAN AODELU AUTOMATION TECHNOLOGY Co Ltd
Priority date: 2013-09-09
Filing date: 2013-09-09
Publication date: 2013-12-25

Abstract

The invention discloses a leakage protector with the judgment function. According to the leakage protector with the judgment function, two circuits are arranged and correspond to slowly-varying leakage initiating current and suddenly-varying pulse leakage initiating current respectively, after one-time judgment is conducted on the suddenly-varying current caused by accidents such as large-area leakage before a delay circuit acts, and then the delay circuit acts. Therefore, the leakage protector with the judgment function effectively avoids the phenomenon that simultaneous motion of three-level leakage protectors causes large-area power failure, and is high in safety, sensitivity and rapidity.

Description

A kind of earth leakage protective device with arbitration functions

Technical field

The present invention relates to field of electronics, especially a kind of earth leakage protective device with arbitration functions.

Background technology

Modern electrified realization has promoted the development of productivity; extensive use along with electric power; the electrical equipment accident caused because of electric equipment improper use or line electrical leakage happens occasionally; safety for the protection lives and properties; three grades of earth leakage protective research and practices have extensively been carried out both at home and abroad; China relevant department has also promulgated corresponding rules; earth leakage protective device is development in recent years a kind of electric equipment that prevents electric accident, the protection person and device security faster, and the reliability consideration of carrying out earth leakage protective device is an important process of electrical apparatus industry., still there are some problems in the safe operation of rural power grids three-level protective at present, depends merely on current time lagged type, phase discriminating pulse type earth leakage protective device, can not overcome above one, two, three earth leakage protective device and move and the shortcoming of large-area power-cuts simultaneously.

Therefore, need a kind of new technical scheme to address the above problem.

Summary of the invention

Goal of the invention: the problem produced in order to solve prior art the invention provides and a kind ofly has greater security, effectively prevents three grades of earth leakage protective devices to move and the earth leakage protective device with arbitration functions of the shortcoming of large-area power-cuts simultaneously.

Technical scheme: for achieving the above object, the present invention can adopt following technical scheme: a kind of earth leakage protective device with arbitration functions comprises zero-sequence transformer, gradual electric-leakage detection circuit, sudden change pulse leakage testing circuit, decision circuitry, delay circuit and relay drive circuit; Described zero-sequence transformer divides two-way to be connected with delay circuit respectively with sudden change pulse leakage testing circuit through gradual electric-leakage detection circuit, finally with relay drive circuit, is connected; Described sudden change pulse leakage testing circuit and delay circuit directly also are provided with decision circuitry;

Under normal line electrical leakage state; when operating current occurs slowly to change; signal transfers to gradual electric-leakage detection circuit; transfer to again the delay circuit effect; when unexpected ground connection or human electric shock's accident appears or other sudden large tracts of land electric leakage situations under; during variation that operating current is undergone mutation; signal transfers to sudden change pulse leakage testing circuit; transfer to again again the delay circuit effect after decision circuitry once judges, thereby can first once judge before the protector effect.

More preferred, the operating current that described gradual electric-leakage detection circuit is corresponding is 20-40mA.

More preferred, operating current corresponding to described sudden change pulse leakage testing circuit is 60-100mA.

Beneficial effect: a kind of earth leakage protective device with arbitration functions disclosed in this invention; the operating current of the two-way circuit corresponding gradual residual operating current of difference and sudden change pulse leakage is set; and the mutation current caused for burst accidents such as large tracts of land electric leakages is acted on after once judging before delay circuit again; effectively avoided three grades of earth leakage protective devices to move and the generation of large-area power-cuts situation simultaneously; there is higher fail safe, sensitivity and rapidity.

The accompanying drawing explanation

Fig. 1 is electrical block diagram of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand following embodiment only is not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.

Refer to shown in Fig. 1, the invention discloses the earth leakage protective device with arbitration functions, comprise zero-sequence transformer, gradual electric-leakage detection circuit, sudden change pulse leakage testing circuit, decision circuitry, delay circuit and relay drive circuit; Described zero-sequence transformer divides two-way to be connected with delay circuit respectively with sudden change pulse leakage testing circuit through gradual electric-leakage detection circuit, finally with relay drive circuit, is connected; Described sudden change pulse leakage testing circuit and delay circuit directly also are provided with decision circuitry;

Wherein, the operating current that described gradual electric-leakage detection circuit is corresponding is 20-40mA, and operating current corresponding to described sudden change pulse leakage testing circuit is 60-100mA.Under normal line electrical leakage state; when operating current occurs slowly to change; signal transfers to gradual electric-leakage detection circuit; transfer to again the delay circuit effect; when unexpected ground connection or human electric shock's accident appears or other sudden large tracts of land electric leakage situations under; during variation that operating current is undergone mutation; signal transfers to sudden change pulse leakage testing circuit; transfer to again again the delay circuit effect after decision circuitry once judges, thereby can first once judge before the protector effect.

Claims

1. the earth leakage protective device with arbitration functions, is characterized in that: comprise zero-sequence transformer, gradual electric-leakage detection circuit, sudden change pulse leakage testing circuit, decision circuitry, delay circuit and relay drive circuit; Described zero-sequence transformer divides two-way to be connected with delay circuit respectively with sudden change pulse leakage testing circuit through gradual electric-leakage detection circuit, finally with relay drive circuit, is connected; Described sudden change pulse leakage testing circuit and delay circuit directly also are provided with decision circuitry;

2. the earth leakage protective device with arbitration functions according to claim 1, it is characterized in that: the operating current that described gradual electric-leakage detection circuit is corresponding is 20-40mA.

3. the earth leakage protective device with arbitration functions according to claim 1, it is characterized in that: operating current corresponding to described sudden change pulse leakage testing circuit is 60-100mA.