CN2279724Y

CN2279724Y - Leakage breaker with zero line detection function

Info

Publication number: CN2279724Y
Application number: CN 96235334
Authority: CN
Inventors: 陈满平
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-19
Filing date: 1996-07-19
Publication date: 1998-04-22
Anticipated expiration: 2006-07-19

Abstract

The utility model relates to a leakage breaker with a zero line detection function, which is characterized in that a ground wiring terminal E is additionally arranged in an original four-pole or two-pole leakage switch; a neon tube H or a resistor or a capacitor is respectively connected to the ground wiring terminal E and the output end P of a zero line N of the original leakage breaker; the original leakage breaker is made to be capable of generating leakage current which can make the leakage breaker act when the zero line is broken or the resistance of the zero line is increased to a certain value. The leakage breaker can effectively protect power distribution facilities and domestic appliances connected to the output end of the leakage breaker.

Description

The residual current circuit breaker of band zero line measuring ability

The utility model relates to a kind of residual current circuit breaker with the zero line measuring ability.

At present, the three-phase four-wire system distribution adopts three live wires, a zero line, line voltage is 380V, phase voltage 220V, the specified working voltage of user's household electrical appliance is 220V, if total zero line breaks, and user's threephase load is when uneven, that light phase voltage of load can rise, and surpasses 220V, easily causes these household electrical appliance gone up mutually and distribution facility to burn out.This fault do not cause by leakage current, and the loose contact of total zero line causes total zero line resistance to increase often, and overheated the blowing of zero line cause, because of no leakage current, existing residual current circuit breaker of installing can not automatic trip, works to protect load.

The purpose of this utility model is the deficiency that overcomes existing residual current circuit breaker, and a kind of residual current circuit breaker with the zero line measuring ability is provided.

The scheme that realizes above-mentioned purpose is: set up a ground binding post in existing four utmost points or two utmost point residual current circuit breaker, and between the zero line output of ground binding post of newly establishing and residual current circuit breaker, connect a detection of electrons element, i.e. neon tube or resistance or electric capacity (but also wherein both combinations).For four utmost point residual current circuit breaker, when zero line breaks to fall or zero line resistance increases to a certain numerical value, when threephase load is uneven again, voltage between zero line and the ground terminal will meet or exceed a certain critical value, at this moment the detection of electrons device that is connected between zero line and the ground terminal will conducting form the leakage current that can make the residual current circuit breaker action, the just automatic trip of this residual current circuit breaker stops sending to load.For two utmost point residual current circuit breaker, as long as breaking, zero line falls or zero line resistance when increasing to a certain numerical value, the detection of electrons element that is connected on ground binding post and zero line output will conducting form the leakage current that can make the residual current circuit breaker action, makes this residual current circuit breaker automatic trip, stops sending.

The residual current circuit breaker of the utility model band zero line measuring ability, simplicity of design, practicality, cost is low, has solved the load burnout phenomenon that breaks and fall to causing because of zero line.

Embodiment one

Accompanying drawing 1 is the circuit theory diagrams of the residual current circuit breaker of four polar form band zero line measuring abilities.

With reference to accompanying drawing:, only indicated three live wire L of original four utmost point residual current circuit breaker among the figure because of the utility model does not relate to circuit construction variations in the existing residual current circuit breaker _A, L _B, L _C, a zero line N, four switch contact K _N, K _A, K _B, K _C, R wherein _A, R _B, R _CBe respectively threephase load.Characteristics of the present utility model are, an earth terminal E is set, and are connected a neon tube H between the P of zero line N point and earth terminal E, and are uneven and because of the switch contact K of zero line N when threephase load _NLoose contact and breaking falls or zero line resistance when increasing to a certain numerical value; the voltage at neon tube H two ends will rise and meet or exceed a certain critical value; neon tube H conducting forms the leakage current can make the residual current circuit breaker action, just automatic trip and stop sending electricity of residual current circuit breaker, thus load is protected.

Embodiment two

Accompanying drawing 2 is the circuit theory diagrams of diarch band zero line measuring ability.

With reference to accompanying drawing 2, L is a live wire among the figure, and N is a zero line, and R is the 220V load.The detection of electrons element of between binding post E and zero line, setting up, adopt neon tube H in the present embodiment, when breaking, the input of zero line falls or resistance when increasing to a certain numerical value, the both end voltage of neon tube H will rise to a certain critical value, neon tube H conducting forms the leakage current can make the residual current circuit breaker action, residual current circuit breaker automatic trip and stop sending.

Claims

1, a kind of residual current circuit breaker with the zero line measuring ability, feature of the present utility model is: meet a neon tube H between the P point of the zero line N of four utmost points and diarch residual current circuit breaker output and the earth terminal E that is provided with.

2, according to the circuit breaker of claim 1, it is characterized in that also available resistance of neon tube H or electric capacity substitute, but the also wherein combination between the two.