CN101728724A

CN101728724A - Multifunction residual current protecting plug

Info

Publication number: CN101728724A
Application number: CN200910192872A
Authority: CN
Inventors: 尧小平; 宋孝阳
Original assignee: GUANGZHOU PANYU KYOKUTO SAKATA ELECTRONICS CO Ltd
Current assignee: GUANGZHOU PANYU KYOKUTO SAKATA ELECTRONICS CO Ltd
Priority date: 2009-09-30
Filing date: 2009-09-30
Publication date: 2010-06-09
Also published as: CN201789162U

Abstract

The invention provides a multifunction residual current protecting plug, comprising a shell 12, an over-temperature rise detection and test circuit 1, a residual current and ground wire current detection circuit 2, a residual current protection circuit 3, a zero/ground wire safety voltage detection circuit 4, a fire/zero wire overvoltage breakdown detection circuit 5, a ground wire charge indication circuit 6, zero/fire/ground wires 7, 8, 9, a mechanical ground wire make-before-break mechanism 10 and a three-pole metal plug 11. When the temperature rise is too high or the test key is pressed down, the current or residual current of the ground wire exceeds the set value; the voltage between the zero wire and the ground wire is higher than the upper limit of the safety voltage; and during fire/zero wire overvoltage breakdown, a ground wire make-before-break fire/zero/ground three-pole contact is broken, thus cutting off the load power supply.

Description

Multifunction residual current protecting plug

Technical field

The present invention relates to the safety technique for using electricity field, particularly a kind of novel multifunctional residual current protecting plug.

Background technology

At present various residual current protecting plugs on the market all are when detecting residual current or ground line current and reaching certain amount, and tripping mechanism is action just, power contact is disconnected reach the protection purpose.But these plugs have and have following deficiency:

1, three utmost point power contacts do not accomplish that real ground wire make-before-break or ground wire can not disconnect

Can not cut off the power supply when 2, occurring dangerous voltage between ground wire and the zero line

Can not cut off the power supply when 3, the high electrical breakdown piezo-resistance occurring between the fiery zero line

Can not cut off the power supply when 4, temperature rise is too high

These all can bring direct or potential threat to user's personal safety.This novel practical is exactly for solving these not enough a kind of multifunction residual current protecting plugs of developing.

Summary of the invention

At the deficiencies in the prior art, this practicality provides a kind of and all can be inserted on three pole sockets by three utmost point metallic plugs 11 before this by residual current protection switch, presses the button three utmost point contacts 10, ground wire make-before-break fire zero ground are connected, and gives follow-up power consumption equipment power supply.Situation below occur: temperature rise is too high, ground line current surpasses designated value, when residual current surpasses designated value, the capital produces induced electromotive force at instrument transformer 2, after the processing and amplifying of residual current protection circuit 3, output driving current makes it action to tripping coil, orders about ground wire make-before-break mechanism and in order the contact is disconnected, and cuts off the electricity supply; On occurring having above safe voltage between over-voltage breakdown or the Zero-liue between the fiery zero line, prescribe a time limit, 4,5 have detection signal and deliver to residual current protection circuit, also can give tripping coil by output driving current after treatment, mechanism is threaded off, three utmost point contacts disconnect in order, cut off the electricity supply; After three utmost point contacts disconnected, when ground wire electrification, ground wire electrification indicating circuit 6 can send orange light indication.

Description of drawings

Accompanying drawing 1 is the embodiments of the invention structured flowcharts;

Accompanying drawing 2 is the schematic circuits that temperature rise, residual current and ground line current detect of crossing of the present invention;

Accompanying drawing 3 is schematic circuits of voltage detecting between the ground of the present invention zero line;

Accompanying drawing 4 is schematic circuits that fiery zero line over-voltage breakdown of the present invention detects;

Accompanying drawing 5 is mechanism maps of mechanical type ground wire make-before-break of the present invention.

Embodiment

Below in conjunction with accompanying drawing this practicality is further specified.As shown in Figure 1, this practicality newly comprises: three utmost point metallic plugs 11, mechanical type ground wire make-before-break mechanism 10, zero line 7, live wire 8, ground wire 9, mistake temperature rise detection and test circuit 1, residual current and ground line current testing circuit 2, residual current protection circuit 3, Zero-liue safe voltage testing circuit 4, fiery zero line over-voltage breakdown testing circuit 5, ground wire electrification indicating circuit 6, shell 12.

As shown in Figure 2, temperature rise detection excessively and test circuit 1 among Fig. 1 comprise: often drive bimetallic temperature detect switch (TDS) 21 with testing button 22 and after connecing, connect with current-limiting resistance 23, the two ends of circuit are connected across between the fiery zero line in addition at the front and back of instrument transformer branch then.Among the figure 25,26,27 is respectively live wire, zero line, ground wire.Residual current and ground line current testing circuit 2 comprise instrument transformer 24 as shown in Figure 2, and fire, zero line pass instrument transformer, and ground wire passes instrument transformer around 1～2 circle, and residual current and ground line current induction are only with an instrument transformer.

As shown in Figure 3, the Zero-liue safe voltage testing circuit 4 in the accompanying drawing 1 comprises: be connected across the resistance 31 between ground wire and the live wire, this resistance can raise the voltage of ground wire when ground wire is unsettled, thereby can detect the voltage between the Zero-liue; The A utmost point connecting to neutral line of voltage stabilizing didoe 32; the A utmost point of the K utmost point and voltage stabilizing didoe 34 joins; the K utmost point and the accelerating circuit 35 of voltage stabilizing didoe 34 join; the K utmost point of the other end of accelerating circuit and rectifier diode 36 connects; the A utmost point and the resistance 37 of rectifier diode join; the other end and the ground wire of resistance 37 connect, and form sequential circuit and are connected across between zero line and the ground wire, and signal voltage detects by 33 and send residual current protection circuit.312 is three utmost point metal bolt, mechanical type make-before-break fire zero ground three utmost point contacts 11 among the figure.Miscellaneous part is among the figure: shell 315, fiery Zero-liue 39,38,310, residual current testing circuit 314, residual current protection circuit 313.

As shown in Figure 4, fiery zero line over-voltage breakdown testing circuit 5 schematic diagrams among Fig. 1 comprise: resistance 41, piezo-resistance 42, switching diode 43, resistance 44, photocoupler 45, protection diode 46, resistance 47 connect by as shown in Figure 4 mode.412 is three utmost point metallic plugs, mechanical type ground wire make-before-break mechanism 411 among the figure, and miscellaneous part is fiery Zero-liue 48,49,410, residual current testing circuit 414, residual current protection circuit 413, shell 415.

As shown in Figure 5, mechanical type make-before-break fire zero ground three utmost point contacts, 11 detailed structure among Fig. 1 comprise: but 56-live wire moving contact, 57-live wire fixed contact, 58-ground wire moving contact, 59-ground wire fixed contact, 510-zero line fixed contact, 511-zero line moving contact and 55-mover B, but mover B exerts pressure for three reeds downwards during connection, three contacts are connected in order, when disconnecting, but the pressure of mover is removed, disjunction contact in order under the active force of reed separately, three contacts.

Claims

1. multifunction residual current protecting plug; comprise: shell 12, mistake temperature rise detection and test circuit 1, residual current and ground line current testing circuit 2, residual current protection circuit 3, Zero-liue safe voltage testing circuit 4, fiery zero line over-voltage breakdown testing circuit 5, ground wire electrification indicating circuit 6, zero line 7, live wire 8, ground wire 9, mechanical type ground wire make-before-break mechanism 10, three utmost point metal bolt 11

Cross temperature rise or press test during button, ground wire has electric current or residual current to surpass set point, occurs being higher than the safe voltage upper limit between the Zero-liue, and ground wire make-before-break fire zero ground three utmost point contacts disconnect during fiery zero line over-voltage breakdown, cut off load power source.

2. multifunction residual current protecting plug according to claim 1; it is characterized in that: described residual current and ground line current testing circuit 2 comprise instrument transformer 24; live wire, zero line pass instrument transformer; ground wire passes instrument transformer around 1～2 circle, and residual current and ground line current induction are only with an instrument transformer.

3. multifunction residual current protecting plug according to claim 2, wherein said temperature rise detection excessively and test circuit 1 comprise: often open bimetal leaf temperature sensitive switch 21, Test Switchboard 22, current-limiting resistance 23, instrument transformer 24, live wire 25, zero line 26, ground wire 27,

The described bimetallic temperature detect switch (TDS) 21 of often opening is connected with current-limiting resistance 23 with testing button 22 and after connecing again, and the two ends of circuit are connected across between the fiery zero line in addition at the front and back of instrument transformer branch then.

4. according to the multifunction residual current protecting plug described in the claim 3, wherein said Zero-liue safe voltage testing circuit 4 comprises:

Be connected across the resistance 31 between ground wire and the live wire, described resistance can raise the voltage of ground wire when ground wire is unsettled;

Voltage stabilizing didoe 32; its A utmost point connecting to neutral line; the A utmost point of the K utmost point and voltage stabilizing didoe 34 joins; the K utmost point and the accelerating circuit 35 of voltage stabilizing didoe 34 join; the K utmost point of the other end of accelerating circuit 35 and rectifier diode 36 connects, and the A utmost point and the resistance 37 of rectifier diode 34 join, and the other end and the ground wire of resistance 37 connect; form sequential circuit and be connected across between zero line and the ground wire, signal voltage detects by 33 and send residual current protection circuit.

5. according to the multifunction residual current protecting plug described in the claim 4, wherein said fiery zero line over-voltage breakdown testing circuit 5 comprises: resistance 41, piezo-resistance 42, switching diode 43, resistance 44, photocoupler 45, protection diode 46, resistance 47.

6. according to the multifunction residual current protecting plug described in the claim 5; wherein said mechanical type ground wire make-before-break mechanism 10 comprises: but the first live wire moving contact 56, the second live wire fixed contact 57, ground wire fixed contact 58, ground wire moving contact 59, zero line fixed contact 60, zero line moving contact 611 movers 55; but mover 55 exerts pressure for three reeds downwards during connection; three contacts are connected in order; when disconnecting; but the pressure of mover is removed, disjunction contact in order under the active force of reed separately, three contacts.