CN104917147B

CN104917147B - Ground wire zero curve partial pressure sampling type earth leakage protective device

Info

Publication number: CN104917147B
Application number: CN201510271105.5A
Authority: CN
Inventors: 钱加灿
Original assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Current assignee: Yuyao Jiarong Electronic Appliance Co Ltd
Priority date: 2015-05-25
Filing date: 2015-05-25
Publication date: 2018-04-13
Anticipated expiration: 2035-05-25
Also published as: CN104917147A

Abstract

The present invention discloses a kind of ground wire zero curve partial pressure sampling type earth leakage protective device; including amplifying circuit, buckle releaser, zero sequence current mutual inductor, silicon-controlled and ground wire mutual inductor; amplifying circuit is used to trigger silicon-controlled; at least one derided capacitors are equipped between ground wire and zero curve; the derided capacitors are in series with least one resistor; the public connecting end of the derided capacitors and resistor is described to divide press bond silicon-controlled or connected by amplifier silicon-controlled as partial pressure end.The present invention overcomes the prior art to need the defects of making alive mutual inductor is to detect ground wire electrical leakage voltage, and ground wire electrical leakage voltage is detected using voltage divider principle；During change-over switch loose contact, voltage-type, current mode works at the same time, and the potential risk such as does not protect caused by solving when change-over switch loose contact.

Description

Ground wire-zero curve partial pressure sampling type earth leakage protective device

Technical field

The present invention relates to Electrical Safety protection technique field, leaks electricity more particularly, to E (ground wire) N (zero curve) partial pressures sampling type Protector.

Background technology

Existing ground wire electrified detection circuit employs mutual induction of voltage coil, since mutual inductor processing technology is complicated, magnetic Core permeability requires height, and homogeneity of product management and control requirement is stringent, and therefore, it is necessary to redesign one kind not having to mutual induction of voltage coil just The circuit that ground wire voltage can be detected.

The content of the invention

(1) technical problems to be solved

Present invention aim to overcome disadvantages mentioned above, it is desirable to provide a kind of ground wire-zero curve partial pressure sampling type electric leakage is protected Protect device.

(2) technical solution

To solve the above problems, the present invention proposes a kind of ground wire-zero curve partial pressure sampling type earth leakage protective device, including amplification electricity Road, buckle releaser, zero sequence current mutual inductor, silicon-controlled and ground wire mutual inductor, amplifying circuit is silicon-controlled for triggering, in ground wire and zero At least one derided capacitors are equipped between line, the derided capacitors are in series with least one resistor, the derided capacitors and electricity The public connecting end of resistance device is connected silicon-controlled by amplifier.

Further, the amplifier includes triode Q2 and triode Q3, the base stage of the partial pressure end connecting triode Q3, The base stage of the triode Q2 is controlled by triode Q3；Capacitance C1 is additionally provided between the zero curve and ground wire.

Further, which further includes change-over switch, triode Q1 and mode indicating lamp LED3；The change-over switch includes Contact S3 and S4；The triode Q1 and mode indicating lamp LED3 are switched over by contact S4；Triode Q1 connection partial pressures end；

When contact S3 short circuit ground wire mutual inductors, S4 connects mode indicating lamp LED3, for indicating to be currently voltage-type work Pattern；

When contact S3 is disconnected, S4 connects triode Q1, and mode indicating lamp LED3 goes out, triode Q1 conductings, the partial pressure end For low potential, ground wire mutual inductor is used to sense ground wire leakage current, and pattern is converted into current mode operating mode.

Further, ground wire electrification exception indicating circuit is additionally provided with, the ground wire electrification exception indicating circuit includes indicator light LED2, voltage-stabiliser tube D6 and capacitance C2, the indicator light LED2, voltage-stabiliser tube D6 and capacitance C2 be sequentially connected in series zero curve and ground wire it Between；The indicator light LED2 is also parallel with protection diode D3.

(3) beneficial effect

Compared with prior art, the present invention has the following advantages：The present invention overcomes the prior art to need making alive mutual inductance The defects of coil is to detect ground wire electrical leakage voltage, ground wire electrical leakage voltage is detected using voltage divider principle；Change-over switch loose contact When, voltage-type, current mode works at the same time, and the potential risk such as does not protect caused by solving when change-over switch loose contact.

Brief description of the drawings

Fig. 1 is the schematic block circuit diagram of ground wire-zero curve partial pressure sampling type earth leakage protective device of the present invention；

Fig. 2 is the circuit diagram of ground wire-zero curve partial pressure sampling type earth leakage protective device of the present invention；

Fig. 3 is the circuit diagram not comprising amplifier of ground wire-zero curve partial pressure sampling type earth leakage protective device of the present invention；

Fig. 4 is the circuit diagram of embodiment two；

Fig. 5 is the circuit diagram not comprising amplifier of embodiment two；

Fig. 6 is the circuit diagram of embodiment three；

Fig. 7 is the circuit diagram not comprising amplifier of embodiment three.

Embodiment

With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below Example is used to illustrate the present invention, but is not limited to the scope of the present invention.

Embodiment one

As shown in Figure 1, Figure 2 and Figure 3, the present invention proposes a kind of ground wire-zero curve partial pressure sampling type earth leakage protective device, including puts Big circuit, buckle releaser, zero sequence current mutual inductor ZCT1, controllable silicon SCR 1 and ground wire E mutual inductor ZCT2, amplifying circuit are used to trigger Controllable silicon SCR 1, wherein, amplifying circuit includes amplification chip IC1, and at least one partial pressure electricity is equipped between ground wire E and zero curve N Hold, the derided capacitors are in series with least one resistor, and the public connecting end of the derided capacitors and resistor passes through amplification Device connects controllable silicon SCR 1.

The amplifier includes triode Q2 and triode Q3, the base stage of the partial pressure end connecting triode Q3, and described three The base stage of pole pipe Q2 is controlled by triode Q3；

Capacitance C1 is additionally provided between the zero curve N and ground wire E.

The circuit further includes change-over switch, triode Q1 and mode indicating lamp LED3；The change-over switch includes contact S3 And S4；The triode Q1 and mode indicating lamp LED3 are switched over by contact S4；Triode Q1 connection partial pressures end；

As contact S3 short circuit ground wire E mutual inductors ZCT2, S4 connects mode indicating lamp LED3, for indicating to be currently voltage-type Operating mode；

When contact S3 is disconnected, S4 connects triode Q1, and mode indicating lamp LED3 goes out, triode Q1 conductings, the partial pressure end For low potential, ground wire E mutual inductors ZCT2 is used to sense ground wire E leakage currents, and pattern is converted into current mode operating mode.

It is additionally provided with ground wire electrification exception indicating circuit, the ground wire electrification exception indicating circuit includes indicator light LED2, steady Pressure pipe D6 and capacitance C2, the indicator light LED2, voltage-stabiliser tube D6 and capacitance C2 are sequentially connected in series between zero curve N and ground wire E；It is described Indicator light LED2 is also parallel with protection diode D3.

The resistor is the one or more in resistance, capacitance or equivalent resistance.

The present invention overcomes the prior art to need the defects of making alive mutual inductor is to detect ground wire electrical leakage voltage, using point Principle is pressed to detect ground wire electrical leakage voltage；During change-over switch loose contact, voltage-type, current mode works at the same time, and solves because turning Change switch contact it is bad when caused by the potential risk such as do not protect；

Operation principle is as follows：

Voltage-type pattern

As shown in Fig. 2, connecting S3, S4 synchro switches make LED3 light (instructed voltage type operating mode), Q1 cut-offs, ZCT2 Coil is forced by S3 short circuits, no signal output, and at the same time, E terminal voltages form circuit through C4, voltage-stabiliser tube DW1, R3 to N-terminal, Detect voltage to take out from D4 ends, when E-N terminal voltages exceed predeterminated voltage, Q3, Q2 conducting, electric current trigger controllable silicon SCR 1 through R6 Conducting, causes tripping coil L1 to be attracted, and tripping mechanism drives S1, and the release of S2 contacts, output terminal is without electricity output；Capacitance C1 can be carried Input impedance between high E-N, its insulation impedance are infinity；Voltage-stabiliser tube D6 can solve, when being grounded good earth, to refer to Show that lamp LED2 bright voltages are more than voltage stabilizing tube voltage, power grid clutter crest voltage lights instruction when solving low-voltage between E-N Lamp phenomenon.

Current mode pattern

S3 is connected, S4 synchro switches make LED3 extinguish (current mode operating mode), and Q1 saturation conductions cause D4 no-voltages defeated Go out, Q3, Q2 cut-offs, at the same time, S3 contacts disconnect, ZCT2 ground line current mutual inductor inductive outputs, when IC1 detects ZCT2 When electric current reaches preset value, IC1 output currents are turned on through D2 triggerings controllable silicon SCR 1, cause tripping coil L1 to be attracted, dropout machine Structure drives S1, and the release of S2 contacts, output terminal is without electricity output.

In addition, above-mentioned Q2, Q3 can be without using physical circuit schematic diagram is directly connected to controllable referring to Fig. 3, its partial pressure end The triggering end of silicon.

Embodiment two

Deletion voltage-stabiliser tube DW1, diode D4 in the present embodiment, increase diode D5, resistance R4 and capacitance C3, resistor Part forms equivalent resistance by R3, R4 and C3, and physical circuit is referring to Fig. 4.

Q2, Q3 are deleted on the basis of Fig. 4, physical circuit is referring to Fig. 5.

Embodiment three

On the basis of Fig. 4, resistance C3 is substituted with capacitance C7, and resistor portions form equivalent resistance, tool by C7, R4 and C3 Body circuit is referring to Fig. 6.

Q2, Q3 are deleted on the basis of Fig. 6, physical circuit is referring to Fig. 7.

It the above is only the preferred embodiment of the present invention, it is noted that come for those skilled in the art Say, without departing from the technical principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims

1. a kind of ground wire-zero curve partial pressure sampling type earth leakage protective device, including amplifying circuit, buckle releaser, zero sequence current mutual inductor, can Silicon and ground wire mutual inductor are controlled, amplifying circuit is used to trigger silicon-controlled, it is characterised in that：

The earth leakage protective device further includes change-over switch, triode Q1 and mode indicating lamp LED3；The change-over switch includes contact S3 and S4；The triode Q1 and mode indicating lamp LED3 are switched over by contact S4；

When contact S3 short circuit ground wire mutual inductors, S4 connects mode indicating lamp LED3, for indicating to be currently voltage-type operating mode； Triode Q1 ends, and ground wire mutual inductor ZCT2 coils are forced by contact S3 short circuits, no signal output, at the same time, ground terminal electricity Pressure forms circuit through capacitance C4, voltage-stabiliser tube DW1, resistance R3 to zero line side, and voltage-stabiliser tube DW1 anode and zero line side are provided directly with two Pole pipe D4；Voltage-stabiliser tube DW1 anode are connected with the anode of diode D4, and using the connecting pin as partial pressure end；

The earth leakage protective device further includes triode Q2 and triode Q3, the base stage of the partial pressure end connecting triode Q3, and described three The base stage of pole pipe Q2 is controlled by triode Q3；Capacitance C1 is additionally provided between the zero curve and ground wire；Voltage is detected from diode D4 Anode takes out, and when the voltage between neutral-ground exceeds predeterminated voltage, triode Q3, triode Q2 conducting, electric current is through resistance R6 triggerings controllable silicon SCR 1 turns on, and causes buckle releaser to act, output terminal is without electricity output；

The triode Q1 collectors connection partial pressure end, when contact S3 is disconnected, S4 connects triode Q1, mode indicating lamp LED3 Go out, triode Q1 conductings, the partial pressure end is low potential, and ground wire mutual inductor is used to sense ground wire leakage current, and pattern is converted into Current mode operating mode；Triode Q1 saturation conductions cause diode D4 Non voltage outputs, and triode Q3, triode Q2 end, At the same time, S3 contacts in contact disconnect, ground wire mutual inductor ZCT2 inductive outputs, when amplifying circuit detects that ZCT2 electric currents reach pre- If during value, amplifying circuit output current is turned on through diode D2 triggerings controllable silicon SCR 1, causes buckle releaser to act, output terminal is without electricity Output.

2. ground wire according to claim 1-zero curve partial pressure sampling type earth leakage protective device, it is characterised in that：It is additionally provided with ground wire Band electrical anomaly indicating circuit, the ground wire electrification exception indicating circuit includes indicator light LED2, voltage-stabiliser tube D6 and capacitance C2, described Indicator light LED2, voltage-stabiliser tube D6 and capacitance C2 are sequentially connected in series between zero curve and ground wire；The indicator light LED2 is also parallel with guarantor Protect diode D3.