CN203339656U

CN203339656U - Earth leakage protection device for ground wire

Info

Publication number: CN203339656U
Application number: CN2013201473060U
Authority: CN
Inventors: 钱加灿
Original assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Current assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Priority date: 2013-03-28
Filing date: 2013-03-28
Publication date: 2013-12-11
Anticipated expiration: 2023-03-28

Abstract

The utility model discloses an earth leakage protection device for a ground wire, and the device comprises a phase line L with a switch, a zero line N with a switch, and a ground wire E with a switch. The device also comprises a zero-sequence current transformer, a testing circuit, a tripper, a rectifier circuit, a step-down circuit, and a silicon controlled rectifier, wherein the zero-sequence current transformer, the testing circuit, the tripper, the rectifier circuit, the step-down circuit and the silicon controlled rectifier pass through the phase line L and the zero line N. The device is characterized in that the device is also provided with a ground-wire current transformer and a dual-input amplifier; the ground-wire current transformer passes through the ground wire E; the primary coil of the ground-wire current transformer is connected with one input end of the dual-input amplifier; two output ends of the dual-input amplifier are respectively connected with two trigger electrodes of the silicon controlled rectifier; and the output end of the zero-sequence current transformer is connected to the other input end of the dual-input amplifier. The device provided by the utility model can simplifies the structure and adjust a control parameter flexibly.

Description

The ground wire earth leakage protective device

Technical field

The utility model relates to the protective device that a kind of ground wire electrification is pressed.

Background technology

The existing device with earth wire charged protecting, as all-purpose leakage protection plug, generally refer to and can disconnect when electric leakage appears in the phase zero line at protective device (plug), while being also included within ground wire electrification, can disconnect, it generally comprises the phase be connected with fixed contact by the movable contact flexure strip, zero, ground three utmost points, through phase, zero sequence current mutual inductor between zero line, test loop, rectifier, controllable silicon, release, zero sequence current mutual inductor through ground wire, it is except detecting the load phase, between zero line, have or not outside leakage current, whether also detect ground wire has leakage current to pass through, work as phase line, when zero line or ground wire leakage current occurs respectively or simultaneously, two magnetic test coils all can make release immediately by phase, zero, ground wire all disconnects, cut off the electricity supply, thereby effectively ensured personal safety, therefore in household electrical appliance, be widely applied.

But, because the difference of power utilization environment, the difference of working condition are had higher requirement to this series products, therefore need to develop the product that structure is more simple, can adapt to better power utilization environment.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of ground wire earth leakage protective device for the above-mentioned condition of prior art, makes that it is simple in structure, can adapt to power utilization environment.

The utility model solves the problems of the technologies described above adopted technical scheme:

The ground wire earth leakage protective device, the phase line L that comprises each belt switch, zero line N, ground wire E tri-utmost points, through phase line L, the zero sequence current mutual inductor of zero line N, hookup, release, rectification circuit, reduction voltage circuit, controllable silicon, it is characterized in that: a ground line current instrument transformer and double input end amplifier also are set, the ground line current instrument transformer is through ground wire E, the secondary coil of ground line current instrument transformer is connected with an input of double input end amplifier, two outputs of double input end amplifier are connected with two silicon controlled trigger electrodes respectively, another input of the output access double input end amplifier of zero sequence current mutual inductor.

Compared with prior art, the utility model has the advantage of:

Due to the ground line current instrument transformer being set in ground wire, therefore can guarantee when the ground wire electric leakage has electric current to flow through to trip, guarantee the ground wire leakproof, guarantee Electrical Safety.

Adopt the double input end amplifier, the secondary coil of zero sequence current mutual inductor and ground line current instrument transformer can be accessed in same amplifier, and can be amplified for different leakage currents, therefore can simplified structure, adjust and control parameter flexibly.

The accompanying drawing explanation

The circuit theory schematic diagram that Fig. 1 is the utility model embodiment.

Embodiment

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

As shown in Figure 1; the ground wire earth leakage protective device; phase line L, the zero line N, ground wire E tri-utmost points that comprise belt switch K; zero sequence current mutual inductor ZCT1, hookup R2, AN, release L1, rectification circuit D1, reduction voltage circuit R1, controllable silicon SCR 1 through phase line L, zero line N are original circuit for electric leakage protector, increase ground line current instrument transformer ZCT2, a double input end amplifier IC in original leakage protection circuit.

Ground line current instrument transformer ZCT2 is through ground wire, the secondary coil of ground line current instrument transformer ZCT2 is connected with the input of double input end amplifier IC, the output of double input end amplifier IC is connected with the trigger electrode of controllable silicon SCR 1, and another output of double input end amplifier IC is connected with the trigger electrode of controllable silicon SCR 2.

When ground wire E has electric current to flow through; the secondary coil of ground line current instrument transformer ZCT2 can induce electric current and trigger controlled silicon conducting and make the release tripping operation of threading off to the controllable silicon SCR trigger electrode after double input end amplifier IC amplifies, thereby makes the outage of ground wire earth leakage protective device.

Between above-mentioned controllable silicon SCR 2 trigger electrodes and zero line N1, capacitor C 1 is set, can prevents extraneous electrical interference signal false triggering controllable silicon SCR 2.

Between above-mentioned controllable silicon SCR 1 trigger electrode and zero line N1, capacitor C 2 is set, can prevents extraneous electrical interference signal false triggering controllable silicon SCR 1.

Regulating resistance R3 of the parallel connection of secondary windings of above-mentioned ground line current instrument transformer ZCT2, regulating resistance R4 is the tripping current of line E convertibly.

Capacitor C 3 of the parallel connection of secondary windings of above-mentioned ground line current instrument transformer ZCT2, can prevent from disturbing the signal of telecommunication to enter amplifier IC.

Regulating resistance R4 of the parallel connection of secondary windings of above-mentioned zero sequence current mutual inductor ZCT1, regulating resistance R4 can change the leakage tripping electric current of zero line N or live wire N.

Capacitor C 4 of the parallel connection of secondary windings of above-mentioned zero sequence current mutual inductor ZCT1, can prevent from disturbing the signal of telecommunication to enter amplifier IC.

Between above-mentioned reduction voltage circuit R1 mono-end and zero line N1, capacitor C 5 is set, can guarantees better the stable of amplifier IC power supply.

Claims

1. ground wire earth leakage protective device, the phase line L that comprises each belt switch, zero line N, ground wire E tri-utmost points, through phase line L, the zero sequence current mutual inductor of zero line N, hookup, release, rectification circuit, reduction voltage circuit, controllable silicon, it is characterized in that: a ground line current instrument transformer and double input end amplifier also are set, the ground line current instrument transformer is through ground wire E, the secondary coil of ground line current instrument transformer is connected with an input of double input end amplifier, two outputs of double input end amplifier are connected with two silicon controlled trigger electrodes respectively, another input of the output access double input end amplifier of zero sequence current mutual inductor.

2. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: between described another controllable silicon trigger electrode and zero line, electric capacity is set.

3. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: between a described controllable silicon trigger electrode and zero line, electric capacity is set.

4. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: regulating resistance of the parallel connection of secondary windings of described ground line current instrument transformer.

5. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: electric capacity of the parallel connection of secondary windings of described ground line current instrument transformer.

6. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: regulating resistance of the parallel connection of secondary windings of described zero sequence current mutual inductor.

7. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: electric capacity of the parallel connection of secondary windings of described zero sequence current mutual inductor.

8. ground wire earth leakage protective device as claimed in claim 1, is characterized in that: between described reduction voltage circuit one end and zero line, electric capacity is set.