CN104577977A - Voltage and current switchable type electric leakage protection device - Google Patents

Voltage and current switchable type electric leakage protection device Download PDF

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Publication number
CN104577977A
CN104577977A CN201410828550.2A CN201410828550A CN104577977A CN 104577977 A CN104577977 A CN 104577977A CN 201410828550 A CN201410828550 A CN 201410828550A CN 104577977 A CN104577977 A CN 104577977A
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CN
China
Prior art keywords
circuit
described
electric capacity
voltage
ground wire
Prior art date
Application number
CN201410828550.2A
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Chinese (zh)
Inventor
钱加灿
Original Assignee
余姚市嘉荣电子电器有限公司
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Priority to CN201410828550.2A priority Critical patent/CN104577977A/en
Publication of CN104577977A publication Critical patent/CN104577977A/en

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Abstract

The invention discloses a voltage and current switchable type electric leakage protection device. The voltage and current switchable type electric leakage protection device comprises a release, a rectifier diode, a silicon controlled rectifier, an indicator light circuit, a voltage reduction circuit, a first amplification circuit, a zero sequence current transformer, a test circuit, a second amplification circuit and an overtemperature detection circuit, wherein the second amplification circuit is further provided with a ground wire current transformer and a ground wire voltage detection circuit. The novel voltage and current switchable type electric leakage protection device can shut off power supply under the conditions that the load end is zero, a phase line has electric leakage and a power supply socket ground wire is charged.

Description

Electric current and voltage switching earth leakage protective device

Technical field

The present invention relates to Electrical Safety resist technology field, especially relate to a kind of electric current and voltage switching earth leakage protective device.

Background technology

Existing electric leakage protection technology is zero line (N) mainly, phase line (L) is entirely made earth leakage protective device through zero-sequence transformer simultaneously and is used, and ground wire electrified detection (voltage detecting and current detecting), owing to have employed instrument transformer (voltage-type) in existing ground wire electrified detection protective device, voltage-type Cleaning Principle is based upon input supply terminal: connect instrument transformer and series resistor or other available components between ground wire (E) and zero line (N), the insulation resistance <10M Ω between N-E has been met when importing practical application after realizing principle, measure loop poor anti-interference is caused because input impedance is high, detection scheme effectively can not realize commercialization, major part design only rests on principle stage, in order to solve the insulation resistance of N-E end and improve antijamming capability, the following technical solution of special proposition.

Summary of the invention

(1) technical problem that will solve

Object of the present invention will overcome above-mentioned shortcoming exactly, aims to provide a kind of electric current and voltage switching earth leakage protective device.

(2) technical scheme

For solving the problem, the present invention proposes a kind of electric current and voltage switching earth leakage protective device, comprise release, rectifier diode, controllable silicon, indicator light circuit, reduction voltage circuit, the first amplifying circuit, zero sequence current mutual inductor, test circuit, the second amplifying circuit and overtemperature testing circuit, described second amplifying circuit is also provided with ground line current instrument transformer and ground wire voltage testing circuit; Described ground wire voltage testing circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity and regulating resistance; Described first electric capacity one end connects zero line side, the other end connects one end of the second amplifying circuit and regulating resistance, described second electric capacity one end connects zero line side, and the other end connects one end of regulating resistance and the 3rd electric capacity, and the other end of described 3rd electric capacity connects ground terminal; Described ground line current instrument transformer and ground wire voltage testing circuit are switched by change over switch.

Further, described ground wire voltage testing circuit is also provided with the 4th electric capacity and diode, described first to fourth electric capacity forms capacitance bridge, described first electric capacity is connected one end of regulating resistance with the common port of the 4th electric capacity, described second electric capacity is connected the other end of regulating resistance and the positive pole of diode with the common port of the 3rd electric capacity, and the negative pole of described diode connects change over switch.

Further, described ground line current instrument transformer is passed by ground wire.

Further, between described first amplifying circuit and controllable silicon, be provided with the first reverse isolation circuit, between described second amplifying circuit and controllable silicon, be provided with the second reverse isolation circuit.

Further, be provided with induced voltage between described zero line and ground wire and eliminate circuit and ground wire electrification indicating circuit.

Further, the preferred safety Y capacitance of first to fourth electric capacity of this circuit.

(3) beneficial effect

Compared with prior art, the present invention has the following advantages: can provide load end zero, phase line leak electricity, and power supply base ground wire electrification also can cut off the electricity supply power supply a kind of new type electric leakageproof device; In power input zero line N-ground wire E termination 2 or 4 safety Y capacitance, utilize the logical friendship of electric capacity every straight electrical characteristic, control earth leakage protective drive system is gone to realize creepage protection function from the mid point taking-up voltage signal of serial connection 2 electric capacity or 4 electric capacity, because input signal adopts Capacitor apart to extract, therefore hold insulation resistance to be infinitely great at zero line N-ground wire E, make use of positive and negative input mode simultaneously therefore improve anti-interference; The replaceable original employing ground wire voltage instrument transformer of this circuit detects the electrical structure of ground strip voltage condition, to reach better anti-interference.

Accompanying drawing explanation

Fig. 1 is the circuit theory schematic diagram of electric current and voltage switching earth leakage protective device of the present invention;

Fig. 2 is the circuit theory schematic diagram of the embodiment two of electric current and voltage switching earth leakage protective device of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.

Embodiment one

Circuit theory diagrams as shown in Figure 1, electric current and voltage switching earth leakage protective device of the present invention, comprise release L1, rectifier diode D1, controllable silicon SCR 1, indicator light circuit is made up of LED1 and resistance R1, reduction voltage circuit is made up of resistance R2, first amplifying circuit IC1, zero sequence current mutual inductor ZCT1, test circuit is made up of K switch 1 and resistance R3, second amplifying circuit IC2 and overtemperature testing circuit are (by voltage-reference U1, resistance R4, resistance R5, resistance R6, triode Q1 and thermistor RT forms), described second amplifying circuit IC2 is also provided with ground line current instrument transformer ZCT2 and ground wire voltage testing circuit, described ground wire voltage testing circuit comprises the first electric capacity C4, the second electric capacity C5, the 3rd electric capacity C6 and regulating resistance R7, described first electric capacity C4 one end connects zero line side, the other end connects one end of the second amplifying circuit and regulating resistance R7, described second electric capacity C5 one end connects zero line side, and the other end connects one end of regulating resistance R7 and the 3rd electric capacity C6, and the other end of described 3rd electric capacity C6 connects ground wire E end, described ground line current instrument transformer ZCT2 and ground wire voltage testing circuit are switched by change over switch K2.

Described ground line current instrument transformer ZCT2 is passed by ground wire E.

Be provided with the first reverse isolation circuit and diode D2 between described first amplifying circuit IC1 and controllable silicon SCR, between described second amplifying circuit IC2 and controllable silicon SCR, be provided with the second reverse isolation circuit and diode D3.

Be provided with induced voltage between described zero line N and ground wire E and eliminate circuit and ground wire electrification indicating circuit.It is electric capacity C1 that induced voltage eliminates circuit, and ground wire electrification indicating circuit is made up of neon lamp X1 and electric capacity C2.

Operation principle of the present invention is as follows:

1 load zero, phase line earth leakage protective

After protector plug access 220V input power, pressure presses return unit switch S 1, S2 closes, work indication LED 1 is lighted, supply voltage through dropout solenoid, D1 rectification, R2 current limliting, supply IC1 after C3 filtering, IC2 chip also makes to obtain electricity work (this process hereinafter referred: protector obtains electricity work); When load end (output) L or N arbitrary end exports electric leakage, mutual inductor ZCT1 exports induced voltage, send into 1 and 2 pin that IC1 detects drive circuit respectively, when leakage current reaches preset value, 7 pin export high level through D2 to control machines pole, controlled silicon conducting, and the adhesive of L1 solenoid drives tripping mechanism to make closing contact (S1, S2) disconnect, cut off the effect that load power source plays safeguard protection;

2 earth wire charged protectings (E end/voltage-type)

Protector obtains electricity work, ground wire electrification voltage is through electric capacity C6, the coupling dividing potential drop of C5 is extracted, signal delivers to 2 pin of IC2 through change over switch K2, one road signal extracts 1 pin sending into IC2 through C4, resistance R7 is for regulating the detection sensitivity of IC2, when N-E end band electric strength reaches preset value, 7 pin of IC2 export high level and deliver to SCR1 trigger electrode through D3, controlled silicon conducting, the adhesive of L1 solenoid drives tripping mechanism that closing contact (S1, S2) is disconnected, and cuts off the effect that load power source plays safeguard protection;

3 earth wire charged protectings (E end/current mode)

Protector obtains electricity work, ground wire electrification electric current responds to output through instrument transformer ZCT2, signal delivers to 2 pin of IC2 through change over switch K2, one road signal directly sends into 1 pin of IC2, resistance R8 is for regulating the detection sensitivity of IC2, when after E end band electricity electric current flows through ZCT2 coil, leakage current reaches preset value, 7 pin of IC2 export high level and deliver to SCR1 trigger electrode through D3, controlled silicon conducting, the adhesive of L1 solenoid drives tripping mechanism to make closing contact (S1, S2) disconnect, cut off the effect that load power source plays safeguard protection;

4 protector plug overtemperature protes

Protector obtains electricity work; when overtemperature protection device detects that protector plug temperature reaches preset temperature; C3 voltage is through R6; RT1 delivers to U1, and the conducting of the U1 degree of depth causes Q1 conducting, and On current triggers SCR1; controlled silicon conducting; the adhesive of L1 solenoid drives tripping mechanism that closing contact (S1, S2) is disconnected, and cuts off the effect that load power source plays safeguard protection.

The present invention has the following advantages: can provide load end zero, phase line leak electricity, and power supply base ground wire electrification also can cut off the electricity supply power supply a kind of new type electric leakageproof device; In power input zero line N-ground wire E termination 2 or 4 safety Y capacitance, utilize the logical friendship of electric capacity every straight electrical characteristic, control earth leakage protective drive system is gone to realize creepage protection function from the mid point taking-up voltage signal of serial connection 2 electric capacity or 4 electric capacity, because input signal adopts Capacitor apart to extract, therefore hold insulation resistance to be infinitely great at zero line N-ground wire E, make use of positive and negative input mode simultaneously therefore improve anti-interference; The replaceable original employing ground wire voltage instrument transformer of this circuit detects the electrical structure of ground strip voltage condition, to reach better anti-interference.

Embodiment two

The present embodiment is substantially identical with beneficial effect with the principle of embodiment one, difference is: as shown in Figure 2, described ground wire voltage testing circuit is also provided with the 4th electric capacity C7 and diode D4, described first to fourth electric capacity forms capacitance bridge, described first electric capacity C4 is connected one end of regulating resistance R7 with the common port of the 4th electric capacity C7, described second electric capacity C2 is connected the other end of regulating resistance R7 and the positive pole of diode D4 with the common port of the 3rd electric capacity C3, and the negative pole of described diode D4 connects change over switch K2.When ground strip piezoelectric voltage is through C6; the coupling rectification of D4 is extracted; signal delivers to 2 pin of IC2 through change over switch K2; one road signal extracts 1 pin sending into IC2 through C4; resistance R7 is for regulating the detection sensitivity of IC2; C5; C7 is dividing potential drop balance adjustment; when N-E end band electric strength reaches preset value; 7 pin of IC2 export high level and deliver to SCR1 trigger electrode through D3, controlled silicon conducting, and the adhesive of L1 solenoid drives tripping mechanism to make closing contact (S1; S2) disconnect, cut off the effect that load power source plays safeguard protection.

Below be only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (5)

1. an electric current and voltage switching earth leakage protective device, comprise release, rectifier diode, controllable silicon, indicator light circuit, reduction voltage circuit, the first amplifying circuit, zero sequence current mutual inductor, test circuit, the second amplifying circuit and overtemperature testing circuit, it is characterized in that: described second amplifying circuit is also provided with ground line current instrument transformer and ground wire voltage testing circuit; Described ground wire voltage testing circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity and regulating resistance; Described first electric capacity one end connects zero line side, the other end connects one end of the second amplifying circuit and regulating resistance, described second electric capacity one end connects zero line side, and the other end connects one end of regulating resistance and the 3rd electric capacity, and the other end of described 3rd electric capacity connects ground terminal; Described ground line current instrument transformer and ground wire voltage testing circuit are switched by change over switch.
2. electric current and voltage switching earth leakage protective device according to claim 1; it is characterized in that: described ground wire voltage testing circuit is also provided with the 4th electric capacity and diode; described first to fourth electric capacity forms capacitance bridge; described first electric capacity is connected one end of regulating resistance with the common port of the 4th electric capacity; described second electric capacity is connected the other end of regulating resistance and the positive pole of diode with the common port of the 3rd electric capacity, and the negative pole of described diode connects change over switch.
3. electric current and voltage switching earth leakage protective device according to claim 1 and 2, is characterized in that: described ground line current instrument transformer is passed by ground wire.
4. electric current and voltage switching earth leakage protective device according to claim 3; it is characterized in that: between described first amplifying circuit and controllable silicon, be provided with the first reverse isolation circuit, between described second amplifying circuit and controllable silicon, be provided with the second reverse isolation circuit.
5. the electric current and voltage switching earth leakage protective device according to any one of claim 4, is characterized in that: be provided with induced voltage between described zero line and ground wire and eliminate circuit and ground wire electrification indicating circuit.
CN201410828550.2A 2014-12-26 2014-12-26 Voltage and current switchable type electric leakage protection device CN104577977A (en)

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Application Number Priority Date Filing Date Title
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104917147A (en) * 2015-05-25 2015-09-16 余姚市嘉荣电子电器有限公司 EN voltage-dividing and sampling type leakage protector
CN104979798A (en) * 2015-05-04 2015-10-14 余姚市嘉荣电子电器有限公司 Automatic identification omnibearing protection leakage protector device
CN104993335A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug
CN104993329A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug with switchable protection modes
CN104993330A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug
CN105006707A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Protection-mode-convertible electric leakage protection plug
CN105006709A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Ground-wire-protection-mode-convertible electric leakage protection plug
CN105006708A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Protection-mode-convertible electric leakage protection plug
CN105006705A (en) * 2015-07-22 2015-10-28 深圳市良辉科技有限公司 Protected mode-convertible type leakage protection plug
CN105024239A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Electric leakage protection plug
CN105024240A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Earth leakage protection plug capable of converting ground wire protection modes
CN105024237A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Electric leakage protective plug
CN105024238A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Leakage protection plug capable of converting ground protection mode
CN105071145A (en) * 2015-07-28 2015-11-18 深圳市良辉科技有限公司 Earth leakage protective plug with switchable ground wire protective modes
CN106169733A (en) * 2016-06-07 2016-11-30 佛山市顺德区信辉达电子有限公司 Conversion voltage-type leakage protecting plug

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CN202616744U (en) * 2012-03-21 2012-12-19 罗萱宁 Leakage protector
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CN203826704U (en) * 2014-03-31 2014-09-10 常熟市立得电器有限公司 Tripolar-and-dipolar mutually switchable earth leakage protection plug
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104979798A (en) * 2015-05-04 2015-10-14 余姚市嘉荣电子电器有限公司 Automatic identification omnibearing protection leakage protector device
CN104979798B (en) * 2015-05-04 2017-11-03 余姚市嘉荣电子电器有限公司 Automatic identification omnibearing protection earth leakage protective device device
CN104917147A (en) * 2015-05-25 2015-09-16 余姚市嘉荣电子电器有限公司 EN voltage-dividing and sampling type leakage protector
CN104917147B (en) * 2015-05-25 2018-04-13 余姚市嘉荣电子电器有限公司 Ground wire zero curve partial pressure sampling type earth leakage protective device
CN104993329A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug with switchable protection modes
CN104993335A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug
CN104993330A (en) * 2015-07-22 2015-10-21 深圳市良辉科技有限公司 Leakage protection plug
CN105006705A (en) * 2015-07-22 2015-10-28 深圳市良辉科技有限公司 Protected mode-convertible type leakage protection plug
CN105006708A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Protection-mode-convertible electric leakage protection plug
CN105006707A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Protection-mode-convertible electric leakage protection plug
CN105006709A (en) * 2015-07-28 2015-10-28 深圳市良辉科技有限公司 Ground-wire-protection-mode-convertible electric leakage protection plug
CN105071145A (en) * 2015-07-28 2015-11-18 深圳市良辉科技有限公司 Earth leakage protective plug with switchable ground wire protective modes
CN105024237A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Electric leakage protective plug
CN105024238A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Leakage protection plug capable of converting ground protection mode
CN105024239A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Electric leakage protection plug
CN105024240A (en) * 2015-08-07 2015-11-04 深圳市良辉科技有限公司 Earth leakage protection plug capable of converting ground wire protection modes
CN106169733A (en) * 2016-06-07 2016-11-30 佛山市顺德区信辉达电子有限公司 Conversion voltage-type leakage protecting plug

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Application publication date: 20150429