CN204441856U - Electric current and voltage switching earth leakage protective device - Google Patents
Electric current and voltage switching earth leakage protective device Download PDFInfo
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- CN204441856U CN204441856U CN201420849494.6U CN201420849494U CN204441856U CN 204441856 U CN204441856 U CN 204441856U CN 201420849494 U CN201420849494 U CN 201420849494U CN 204441856 U CN204441856 U CN 204441856U
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Abstract
The utility model discloses 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.The utility model 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.
Description
Technical field
The utility model relates to Electrical Safety resist technology field, especially relates 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.
Utility model content
(1) technical problem that will solve
The purpose of this utility model 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 utility model 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 utility model 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 utility model;
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 utility model.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used for limiting scope of the present utility model.
Embodiment one
Circuit theory diagrams as shown in Figure 1, electric current and voltage switching earth leakage protective device of the present utility model, 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.
Utility model works principle 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 utility model 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 preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849494.6U CN204441856U (en) | 2014-12-26 | 2014-12-26 | Electric current and voltage switching earth leakage protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849494.6U CN204441856U (en) | 2014-12-26 | 2014-12-26 | Electric current and voltage switching earth leakage protective device |
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| CN204441856U true CN204441856U (en) | 2015-07-01 |
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| CN201420849494.6U Active CN204441856U (en) | 2014-12-26 | 2014-12-26 | Electric current and voltage switching earth leakage protective device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577977A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Voltage and current switchable type electric leakage protection device |
| CN111277016A (en) * | 2020-03-02 | 2020-06-12 | 桐乡佳车科技股份有限公司 | Anti-electric-shock charging equipment for mobile carrier in textile workshop and using method of charging equipment |
-
2014
- 2014-12-26 CN CN201420849494.6U patent/CN204441856U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577977A (en) * | 2014-12-26 | 2015-04-29 | 余姚市嘉荣电子电器有限公司 | Voltage and current switchable type electric leakage protection device |
| CN111277016A (en) * | 2020-03-02 | 2020-06-12 | 桐乡佳车科技股份有限公司 | Anti-electric-shock charging equipment for mobile carrier in textile workshop and using method of charging equipment |
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