CN204374341U - A kind of earth detector - Google Patents
A kind of earth detector Download PDFInfo
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- CN204374341U CN204374341U CN201420515893.9U CN201420515893U CN204374341U CN 204374341 U CN204374341 U CN 204374341U CN 201420515893 U CN201420515893 U CN 201420515893U CN 204374341 U CN204374341 U CN 204374341U
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- contactor
- leakage current
- earth detector
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Abstract
Basis is novel relates to a kind of earth detector, comprising: contactor, is suitable for the driver element driving contactor coil, and leakage current test sensing unit; Described leakage current test sensing unit is suitable for the leakage current according to gathered electrical appliance enclosure, controlling drive unit drives contactor coil obtains electric, close to make the normally opened contact of contactor, maintain power electrical apparatus, or control drive unit drives contactor coil dead electricity, to make the normally closed contact of contactor close, disconnect power electrical apparatus.The utility model realizes super protection act function by detecting leakage current, namely realizes power-off protection to consumer, and sends corresponding leakage-current alarm; And; this earth detector also prevents the savings of leakage current; and the protection of this leakage current can be adjusted by first, second potentiometer, to adapt to the safety requirements of zones of different, such as construction and the good place operation of opposing insulation environment in closed conduit.
Description
Technical field
The present invention relates to Electrical Control Technology, is a kind of earth detector that there is unsafe factor design for the electric leakage of production scene mobile device and uneasy attaching ground wire.
Background technology
A lot of high-power electrical equipment; such as: a lot of equipment of electric welding machine, cutting machine etc.; by national standard; strict ground wire must be had; the power-supply system that connects has earth leakage protective device; but in actual production, be all incomplete in a lot of situation of such protection system, so electric shock accidents is also very many.Reason of searching to the bottom mainly contains two: 1, system ground connection does not occur, and when there is electric leakage, leakage current has no way of discharging, and human body touches electrified body, and electric shock accidents occurs; 2, do not have earth leakage protective device, when occurring exceeding the leakage current of the max cap. that human body bears but be not enough to make breaker actuation, can not cut off electric power system in time, human body touches electrified body, and electric shock accidents occurs.
Utility model content
The purpose of this utility model is to provide a kind of earth detector, and this device is installed on the power supply introducing portion of the electrical equipment needing protection, and it has the function of diagnosis leakage current, and realizes power-off according to this leakage current, to protect electrical equipment.
In order to solve the problems of the technologies described above, the utility model provides a kind of earth detector, comprising: contactor, is suitable for the driver element driving contactor coil, and leakage current test sensing unit; Described leakage current test sensing unit is suitable for the leakage current according to gathered electrical appliance enclosure, controlling drive unit drives contactor coil obtains electric, close to make the normally opened contact of contactor, maintain power electrical apparatus, or control drive unit drives contactor coil dead electricity, to make the normally closed contact of contactor close, disconnect power electrical apparatus.
Preferably, described earth detector also comprises: the connector be connected with power electrical apparatus end, wherein, this connector comprises: the first pin be connected with electrical appliance enclosure, and is suitable for the crus secunda, the tripod that live wire, ground wire are accessed respectively electrical equipment; Described first pin is connected with leakage current test sensing unit, light emitting diode in this leakage current test sensing unit is coupled with the photoresistance in driver element, to regulate the drive current of complex pipe in driver element, the gain and loss electric control of the tentaculum coil that achieves a butt joint.
Preferably, described complex pipe is made up of first, second NPN type triode, and photoresistance is the biasing resistor of described complex pipe.
Preferably, the base stage of described first NPN type triode is connected with the emitter of the second NPN type triode, the base stage of this second NPN type triode is connected with one end of described photoresistance, the other end of this photoresistance is connected with one end of the first potentiometer, the centre tap of this first potentiometer connects the collector of described second NPN type triode, and the other end of described first potentiometer is connected with the collector of described first NPN type triode; The described emitter of the first NPN type triode is connected with one end of contactor coil, the other end ground connection of this contactor coil.
Preferably, described light emitting diode is also connected with the second potentiometer.
Preferably, live wire is connected with the common port of the first contact of contactor, and the Chang Kaiduan of this first contact is connected with described crus secunda, and ground wire is connected with the common port of the second contact of contactor, and the Chang Kaiduan of this second contact is connected with tripod; The normal-closed end of first, second contact described connects the two ends of rectifying bridge arm respectively, and is suitable for when contactor coil dead electricity, and electric current is accessed described leakage current test sensing unit by rectifying bridge arm by live wire and ground wire, obtains electric self-locking to realize contactor coil.
Preferably, described earth detector also comprises: alarm unit, and this alarm unit is suitable for carrying out leakage-current alarm after disconnection power electrical apparatus.
Preferably, described alarm unit comprises: warning light emitting diode and/or loudspeaker, that is, after described warning light emitting diode is connected with a current-limiting resistance, in parallel with described contactor coil; And/or one end of described loudspeaker is connected with the normal-closed end of the first contact, and other end ground connection.
Technique scheme of the present utility model has the following advantages compared to existing technology: the utility model realizes super protection act function by detecting leakage current, namely realizes power-off protection to consumer, and sends corresponding leakage-current alarm; And; this earth detector also prevents the savings of leakage current; and the protection of this leakage current can be adjusted by first, second potentiometer, to adapt to the safety requirements of zones of different, such as construction and the good place operation of opposing insulation environment in closed conduit.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 shows circuit diagram when described earth detector is power electrical apparatus.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.
Fig. 1 shows circuit diagram when described earth detector is power electrical apparatus.
As shown in Figure 1, a kind of earth detector, comprising: contactor, is suitable for the driver element 100 driving contactor coil KM, and leakage current test sensing unit 200; Described leakage current test sensing unit 200 is suitable for the leakage current according to gathered electrical appliance enclosure, it is electric that control driver element 100 drives contactor coil KM to obtain, close to make the normally opened contact of contactor, maintain power electrical apparatus, or control driver element 100 drives contactor coil KM dead electricity, to make the normally closed contact of contactor close, disconnect power electrical apparatus.
Wherein, common port 2 in first contact K-1 and normal beginning 1, and second common port 5 in the K-2 of contact and normal beginning 4 form corresponding normally opened contact respectively, and, common port 2 in first contact K-1 and normal beginning 3, and common port 5 in the second contact K-2 and normal beginning 6 form corresponding normally closed contact respectively.Be coupled as photoelectric coupling, be namely coupled between light emitting diode VD6 with photoresistance R5.
Described earth detector also comprises: connector XP1, XP2 of being connected with power electrical apparatus end, wherein, this connector comprises: the first pin a be connected with electrical appliance enclosure, and is suitable for the crus secunda b, the tripod c that live wire L, ground wire GND are accessed respectively electrical equipment; Described first pin a is connected with leakage current test sensing unit 200, light emitting diode VD6 in this leakage current test sensing unit 200 is coupled with the photoresistance R5 in driver element 100, to regulate the drive current IC1 of complex pipe in driver element 100, the gain and loss electric control of the tentaculum coil KM that achieves a butt joint.
Described complex pipe is made up of first, second NPN type triode, and photoresistance R5 is the biasing resistor of described complex pipe.
The base stage of described first NPN type triode VT1 is connected with the emitter of the second NPN type triode VT2, the base stage of this second NPN type triode VT2 is connected with one end of described photoresistance R5, the other end of this photoresistance R5 is connected with one end of the first potentiometer RP1, the centre tap of this first potentiometer RP1 connects the collector of described second NPN type triode VT2, and the other end of described first potentiometer RP1 is connected with the collector of described first NPN type triode VT1; The emitter of described first NPN type triode VT1 is connected with one end of contactor coil KM, the other end ground connection of this contactor coil KM.
Described light emitting diode VD6 also connects with the second potentiometer RP2.
Live wire L is connected with the common port 2 of the first contact K-1 of contactor, the Chang Kaiduan 1 of this first contact K-1 is connected with described crus secunda b, ground wire GND is connected with the common port 5 of the second contact K-2 of contactor, and the Chang Kaiduan 4 of this second contact K-2 is connected with tripod c;
The normal-closed end (3,6) of first, second contact described connects the two ends of rectifying bridge arm respectively, and be suitable for when contactor coil KM dead electricity, electric current is accessed described leakage current test sensing unit 200 by rectifying bridge arm by live wire L and ground wire GND, obtains electric self-locking to realize contactor coil KM.Wherein, rectifying bridge arm is made up of diode VD1, VD2, VD10, VD11.Concrete, the anode of diode VD12 is connected with the common cathode end of diode VD11 with diode VD10, and the negative electrode of this diode VD12 is connected with the anode of light emitting diode VD6.
Described earth detector also comprises: alarm unit, and this alarm unit is suitable for carrying out leakage-current alarm after disconnection power electrical apparatus.
Described alarm unit comprises: warning light emitting diode VD9 and loudspeaker BC, after described warning light emitting diode VD9 connects with a current-limiting resistance R4, in parallel with described contactor coil KM; One end of described loudspeaker BC is connected with the normal-closed end 3 of the first contact K-1, and other end ground connection.
Concrete, when electrical installation leakproof, between its power lead L and GND and shell, there is good insulation.Now diode VD12 branch road no current (leakage current) circulation, light emitting diode VD6 does not work; Biasing resistor R5 as first, second NPN type triode VT1, VT2 presents larger resistance in the dark (about 500K Ω) because of unglazed photograph; Therefore, the generation collector current IC1(of the first NPN type triode VT1 also can be called drive current), drive contactor coil KM adhesive.Now, electrical installation provides the normal power supply of electrical equipment by the normally opened contact (2,1) of contactor and (5,4).If because certain reason causes electrical appliance enclosure charged, at this moment, will make to produce corresponding leakage current in diode VD12, its flow process is: the tripod C of 1 pin a → diode VD12 → light emitting diode VD6 → the second potentiometer RP2 → resistance R2 → diode VD2 to XP1 from electrical appliance enclosure to connector; And when leakage current increases, light emitting diode VD6 luminescence enhancement, the resistance of photoresistance R5 increases, and the first NPN type triode VT1 hinders partially, and IC1 turns off, contactor coil dead electricity, and namely power supply is cut-off, and not at crisis human body; Then normally opened contact K-1(2,1), K-2(5,4) closed making, between leakage current test sensing unit 200 is connected on diode VD1, diode VD2 and diode VD10, diode VD11 forms rectifying bridge arm, ensure that contactor coil maintains adhesive self-locking state; Hummer BC, warning light emitting diode VD9 send leakage-current alarm simultaneously.
What the present embodiment accessed is 220V Alternating Current Power Supply; Also 3 tunnels can be expanded out, to access 3 cross streams electricity, to meet the power requirement of 380V.
The concrete debug process of described earth detector comprises:
When earth detector is installed, need to debug, namely, first potentiometer RP1 and the second potentiometer RP2 is transferred to maximum, in earth detector place in circuit, one phase line (live line) one ground wire forms the voltage circuit of 220V, distinguish live wire and ground wire simultaneously, at this moment, adjust the value of the first potentiometer RP1, guarantee the stable adhesive of contactor, the adhesive of contactor can ensure consumer access power supply, can normally work, this is the method detecting ground wire quality, if ground wire comes off or contact resistance is large, so contactor can not adhesive, this earth detector can not by power transmission.
After contactor adhesive, an adjustable resistance RQ(is connected in series not shown in FIG. between live wire and ground wire, only do debugging), the resistance that a resistance value is 1K Ω is installed between the earth terminal and the ground wire pile crown of electrical equipment of earth detector, this resistance simulation human body resistance, common people's bulk resistor is 1K about Ω, and this resistance is just similar to human body and is serially connected with between the equipment of electric leakage and the earth, if there is leakage current, so electric current will flow through human body enter the earth, form electric shock accidents, at this moment multimeter is used and exchange shift parallel connection between device earth terminal and system earth line pile crown, adjustment adjustable resistance RQ, when multimeter is shown as 10V shelves, show that the 1K Ω resistance of simulating human body flows through 10mA electric current, this is human-body safety current limit value, at this moment simulation human body 1K Ω resistance is removed, so leakage current electric current will enter the earth without simulation human body resistance, and be through measure loop, at this moment, adjustment RP1, until contactor release, show that light emitting diode VD6 works, the element of original low-resistance is made to form larger resistance R5 because of illumination, contactor is discharged, thus device is quit work because of body leakage stream.
Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (1)
1. an earth detector, is characterized in that, comprising: contactor, is suitable for the driver element driving contactor coil, and leakage current test sensing unit;
Described leakage current test sensing unit is suitable for the leakage current according to gathered electrical appliance enclosure, controls drive unit drives contactor coil and obtains electric, to make the normally opened contact of contactor close, maintains power electrical apparatus, or
Control drive unit drives contactor coil dead electricity, to make the normally closed contact of contactor close, disconnect power electrical apparatus.
2. earth detector according to claim 1, it is characterized in that, described earth detector also comprises: the connector be connected with power electrical apparatus end, wherein, this connector comprises: the first pin be connected with electrical appliance enclosure, and is suitable for the crus secunda, the tripod that live wire, ground wire are accessed respectively electrical equipment;
Described first pin is connected with leakage current test sensing unit, light emitting diode in this leakage current test sensing unit is coupled with the photoresistance in driver element, to regulate the drive current of complex pipe in driver element, the gain and loss electric control of the tentaculum coil that achieves a butt joint.
3. earth detector according to claim 2, is characterized in that, described complex pipe is made up of first, second NPN type triode, and photoresistance is the biasing resistor of described complex pipe.
4. earth detector according to claim 3, it is characterized in that, the base stage of described first NPN type triode is connected with the emitter of the second NPN type triode, the base stage of this second NPN type triode is connected with one end of described photoresistance, the other end of this photoresistance is connected with one end of the first potentiometer, the centre tap of this first potentiometer connects the collector of described second NPN type triode, and the other end of described first potentiometer is connected with the collector of described first NPN type triode;
The described emitter of the first NPN type triode is connected with one end of contactor coil, the other end ground connection of this contactor coil.
5. earth detector according to claim 4, is characterized in that, described light emitting diode is also connected with the second potentiometer.
6. earth detector according to claim 2, it is characterized in that, live wire is connected with the common port of the first contact of contactor, the Chang Kaiduan of this first contact is connected with described crus secunda, ground wire is connected with the common port of the second contact of contactor, and the Chang Kaiduan of this second contact is connected with tripod;
The normal-closed end of first, second contact described connects the two ends of rectifying bridge arm respectively, and is suitable for when contactor coil dead electricity, and electric current is accessed described leakage current test sensing unit by rectifying bridge arm by live wire and ground wire, obtains electric self-locking to realize contactor coil.
7. earth detector according to claim 1, is characterized in that, described earth detector also comprises: alarm unit, and this alarm unit is suitable for carrying out leakage-current alarm after disconnection power electrical apparatus.
8. earth detector according to claim 7, is characterized in that, described alarm unit comprises: warning light emitting diode and/or loudspeaker, namely
After described warning light emitting diode is connected with a current-limiting resistance, in parallel with described contactor coil; And/or
One end of described loudspeaker is connected with the normal-closed end of the first contact, and other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420515893.9U CN204374341U (en) | 2014-09-10 | 2014-09-10 | A kind of earth detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420515893.9U CN204374341U (en) | 2014-09-10 | 2014-09-10 | A kind of earth detector |
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| CN204374341U true CN204374341U (en) | 2015-06-03 |
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| CN201420515893.9U Expired - Fee Related CN204374341U (en) | 2014-09-10 | 2014-09-10 | A kind of earth detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632489A (en) * | 2019-09-03 | 2019-12-31 | 清华大学 | A leakage current-based IGBT junction temperature monitoring circuit and method |
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- 2014-09-10 CN CN201420515893.9U patent/CN204374341U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632489A (en) * | 2019-09-03 | 2019-12-31 | 清华大学 | A leakage current-based IGBT junction temperature monitoring circuit and method |
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