CN205992726U - A kind of earth leakage protective device - Google Patents
A kind of earth leakage protective device Download PDFInfo
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- CN205992726U CN205992726U CN201621042402.9U CN201621042402U CN205992726U CN 205992726 U CN205992726 U CN 205992726U CN 201621042402 U CN201621042402 U CN 201621042402U CN 205992726 U CN205992726 U CN 205992726U
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- ground wire
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- earth leakage
- leakage protective
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Abstract
This utility model provides a kind of earth leakage protective device, is related to electrical engineering technical field, can solve the problem that the earth leakage protective device irregular working that the mutation occurring because of improper use or power utilization environment causes and the hidden danger brought.Described earth leakage protective device includes：Ground wire voltage test section, for detecting the dangerous voltage between the zero line of alternating current power supply and ground wire；Leakage current test portion, for detecting ground wire leakage current；Dropout control unit; it is connected with described ground wire voltage test section and described leakage current test portion respectively; for, in the case that described dangerous voltage is more than predetermined voltage threshold and described ground wire leakage current is more than predetermined current threshold, controlling the corresponding load power down of described earth leakage protective device.
Description
Technical field
This utility model is related to a kind of electric safety device, particularly to a kind of earth leakage protective device.
Background technology
The defencive function of earth leakage protective device, refers under the premise of power supply is normal, when ground wire abnormal belt electricity or load
During electric leakage, load supplying loop can be cut off.
Existing three extremely disconnected earth leakage protective devices are divided into voltage-type and current mode, can be visited by voltage detection and electric current respectively
Survey carries out earth leakage protective, but it is only limitted to ground wire voltage protection or ground wire leakage current protection.Two-mode can only independently make at present
With restriction of respectively having ready conditions on using.Require there is reliable ground system when voltage-type uses, and current mode must be then no
Can use during reliable ground.Voltage-type and current mode improper use will cause misoperation even can not use, and be that user carries
Carry out huge potential safety hazard.
Utility model content
In order to solve the above problems, this programme provides a kind of earth leakage protective device, can solve the problem that because of improper use or electricity consumption
The earth leakage protective device irregular working that causes of mutation that environment occurs and the hidden danger brought.
On the one hand, this utility model provides a kind of earth leakage protective device, including：Ground wire voltage test section, for detection exchange
Dangerous voltage between the zero line of power supply and ground wire；Leakage current test portion, for detecting ground wire leakage current；Dropout control unit,
It is connected with described ground wire voltage test section and described leakage current test portion respectively, for being more than default electricity in described dangerous voltage
Press threshold value and described ground wire leakage current is more than in the case of predetermined current threshold, control the corresponding load of described earth leakage protective device
Power-off.
Optionally, described ground wire voltage test section is connected across between ground wire and zero line, for detecting between ground wire-zero line
Dangerous voltage.
Optionally, described dropout control unit is specifically for being more than predetermined current threshold, and institute in described ground wire leakage current
State dangerous voltage more than in the case of predetermined voltage threshold, control electromagnetic trip coil is threaded off, so that described earth leakage protective device pair
The load power down answered.
Further, described earth leakage protective device also includes comparing section, respectively with described ground wire voltage test section, described electric leakage
Stream test section and described dropout control unit are connected, and the size for relatively described dangerous voltage and described predetermined voltage threshold is closed
System, and compare the magnitude relationship of described ground wire leakage current and described predetermined current threshold.
Further, described earth leakage protective device also includes zero sequence detection of electrical leakage portion, for detecting zero between zero line-live wire
Sequence leakage current, in the case that described zero sequence leakage current is more than default zero sequence threshold value, controls electromagnetic trip coil to thread off, so that institute
State the corresponding load power down of earth leakage protective device.
Further, described dropout control unit is also associated with high-temperature protection circuit, and described high-temperature protection circuit is used for inserting
In the case that foot temperature is higher than preset temperature threshold value, electromagnetic trip coil is controlled to thread off, so that described earth leakage protective device is corresponding
Load power down.
The earth leakage protective device that this utility model embodiment provides, ground wire voltage test section, can detect the zero of alternating current power supply
Dangerous voltage between line and ground wire；Leakage current test portion, can detect ground wire leakage current；Dropout control unit, can be in institute
State dangerous voltage more than predetermined voltage threshold and described ground wire leakage current is described more than, in the case of predetermined current threshold, controlling
The corresponding load power down of earth leakage protective device.In this manner it is possible to determine that ground connection is whether reliable according to dangerous voltage situation, and can
It is abutted against and locks ground line current defencive function in the case of ground, thus avoid current mode leakage protector being caused due to reliable ground
False tripping problem, substantially increase the safety of earth leakage protective device.
Brief description
A kind of structural representation of the earth leakage protective device that Fig. 1 provides for this utility model embodiment；
A kind of detailed construction schematic diagram of the earth leakage protective device that Fig. 2 provides for this utility model embodiment；
Another kind of detailed construction schematic diagram of the earth leakage protective device that Fig. 3 provides for this utility model embodiment；
Fig. 4 is the corresponding a kind of circuit theory diagrams of earth leakage protective device in Fig. 2；
A kind of flow chart of the method for work of the earth leakage protective device that Fig. 5 provides for this utility model.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used for this utility model is described, but is not limited to scope of the present utility model.
As shown in figure 1, embodiment of the present utility model provides a kind of earth leakage protective device, including：
Ground wire voltage test section 11, for detecting the dangerous voltage between the zero line of alternating current power supply and ground wire；
Leakage current test portion 12, for detecting ground wire leakage current；
Dropout control unit 13, is connected with described ground wire voltage test section and described leakage current test portion respectively, for
Described dangerous voltage is more than predetermined voltage threshold and described ground wire leakage current is more than in the case of predetermined current threshold, controls institute
State the corresponding load power down of earth leakage protective device.
The earth leakage protective device that this utility model embodiment provides, ground wire voltage test section 11, can detect alternating current power supply
Dangerous voltage between zero line and ground wire；Leakage current test portion 12, can detect ground wire leakage current；Dropout control unit 13, energy
Enough in the case that described dangerous voltage is more than predetermined voltage threshold and described ground wire leakage current is more than predetermined current threshold, control
Make the corresponding load power down of described earth leakage protective device.In this manner it is possible to determine whether ground connection is reliable according to dangerous voltage situation,
And lock ground line current defencive function in the case of reliable ground, thus avoiding current mode leakage protector due to being abutted against
The false tripping problem that causes, substantially increase the safety of earth leakage protective device.
Optionally, ground wire voltage test section 11 can be connected across in alternating current between ground wire and zero line, for detect ground wire-
Dangerous voltage between zero line.
Leakage current test portion 12, electric current induction coil specially close to each other with ground wire, can sense on ground wire in real time
Curent change.
Specifically, dropout control unit 13 can be connected with tripping coil, by the control to electric current in tripping coil, you can
Realize the disconnection to line switching, thus corresponding load carries out power-off to earth leakage protective device.
For example, in an embodiment of the present utility model, dropout control unit 13 is controlled by ground wire voltage test section 11 He
Leakage current test portion 12, is more than predetermined current threshold in ground wire leakage current, and dangerous voltage is more than the feelings of predetermined voltage threshold
Under condition, electromagnetic trip coil can be controlled to thread off, so that the corresponding load power down of described earth leakage protective device.
Further, in an embodiment of the present utility model, earth leakage protective device may also include comparing section, respectively with ground
Line voltage test section 11, leakage current test portion 12 and dropout control unit 13 are connected, for relatively described dangerous voltage with described
The magnitude relationship of predetermined voltage threshold, and compare the magnitude relationship of described ground wire leakage current and described predetermined current threshold,
And dropout control unit 13 action is triggered according to comparative result.
Further, the earth leakage protective device that this utility model embodiment provides, may also include zero sequence detection of electrical leakage portion, is used for
Zero sequence leakage current between detection zero line-live wire, in the case that described zero sequence leakage current is more than default zero sequence threshold value, controls electricity
Magnetic tripping coil is threaded off, so that the corresponding load power down of described earth leakage protective device.
Further, in the earth leakage protective device that this utility model embodiment provides, dropout control unit 13 also can be connected with height
Warm protection circuit, described high-temperature protection circuit can be used for, in the case that pin temperature is higher than preset temperature threshold value, controlling electromagnetism
Tripping coil is threaded off, so that the corresponding load power down of described earth leakage protective device.
Optionally, earth leakage protective device also can be arranged condition indication circuit and buzzer, condition indication circuit is used for indicating
The currently running status of whole protector, including the display of fault, buzzer plays alarm function.
It is described in detail below by the earth leakage protective device that specific embodiment provides to this utility model.
As shown in Figures 2 and 3, in the present embodiment, earth leakage protective device may include：Ground wire electrification indicating module, ground wire electrification
Detection module, ground wire voltage change-over circuit, ground wire detection of electrical leakage module, high temperature protection control module, zero sequence detection of electrical leakage module,
Electric leakage dropout control module, electromagnetic trip coil.
Ground wire electrified detection module, can be attempted by between power input Ni-Ei (neutral-ground), can detect Ni-
Terminal voltage numerical value between Ei.Wherein, Li represents live wire, and Ni represents zero line, and Ei represents ground wire.
Ground wire voltage change-over circuit, can receive the voltage signal from ground wire electrified detection module, this voltage signal warp
After logical analyses, it is output as high level or low level.When voltage between Ni-Ei is less than or equal to predeterminated voltage, ground wire electricity
The exportable high level of voltage conversion circuit, to lock ground wire detection of electrical leakage module, makes ground wire detection of electrical leakage module be not involved in ground wire electric leakage
Stream protection work；Conversely, when the voltage between Ni-Ei is more than predeterminated voltage, the exportable low level of ground wire voltage change-over circuit
To activate ground wire detection of electrical leakage module, to be allowed to participate in the work of ground wire earth leakage protective.
Optionally, ground wire detection of electrical leakage module, when receiving the high level of ground wire voltage change-over circuit output, electric current is examined
Survey result outwards not export, when receiving the low level of ground wire voltage change-over circuit output, unblock by current detecting result
Outwards transmit.When the ground wire leakage current that ground wire detection of electrical leakage module detects is more than predetermined current threshold, and ground wire electrified detection
When the dangerous voltage that module detects is more than predetermined voltage threshold, electric leakage dropout control module can be triggered, make earth leakage protective device
Tripping operation carries out earth leakage protective.
Zero sequence detection of electrical leakage module is for detecting the zero sequence leakage current between zero line-live wire, big in described zero sequence leakage current
In the case of default zero sequence threshold value, electromagnetic trip coil is controlled to thread off, so that the corresponding load power down of described earth leakage protective device.
High temperature protection control module, can detect whether earth leakage protective device plug temperature is higher than preset temperature threshold value, when slotting
Head temperature exceedes during preset temperature threshold value then output drive signal, so that earth leakage protective device is tripped.
Electric leakage dropout control module, threading off to drive for execution tripping operation uses, and can receive from zero sequence electric leakage module, ground
Line electric leakage module, the execution of either signal in high temperature protection control module is threaded off and is protected.
Fig. 4 is the corresponding circuit theory diagrams of Fig. 2.As shown in figure 4, when ground wire electrified detection module detects between Ni-Ei
Terminal voltage be less than preset value (as 36v) when, export low-voltage, after ground wire voltage change-over circuit, export high level, this height
Level through Q1 and makes its saturation conduction, causes U1_4 foot unconditionally short-circuit, and now ground line current also cannot make U1_7 foot defeated greatly again
Go out high level, therefore ground line current is locked it is impossible to carry out current detecting work, solves plain edition three pole power-off flow pattern product
The false tripping problem causing because of reliable ground.
When the terminal voltage that ground wire electrified detection module detects between Ni-Ei is more than preset value (as 36v), the high electricity of output
Pressure, this high voltage makes ground wire voltage change-over circuit export and is converted into low level, and this low level makes Q1 end, thus causing and connecing
Assume open-circuit condition in U1_4 foot Q1.If now have ground line current to flow through ZCT2 coil and be more than default ground line current, U2_4
Foot exports constant current and charges to C5, and when C5 terminal voltage reaches predeterminated voltage, U1_7 foot exports high level, and this high voltage is through D1
Make SCR1 triggering and conducting, tripping coil obtains electric adhesive, dropout interlock drives and switchs S1, S2, S3 turned off in synchronization load power source,
It is achieved thereby that safety protection function.
Accordingly, as shown in figure 5, embodiment of the present utility model also provides a kind of method of work of earth leakage protective device, bag
Include：
S201, the dangerous voltage between the zero line of detection alternating current power supply and ground wire and ground wire leakage current respectively；
S202, is more than predetermined voltage threshold in described dangerous voltage and described ground wire leakage current is more than predetermined current threshold
In the case of, control the corresponding load power down of described earth leakage protective device.
The method of work of the earth leakage protective device that this utility model embodiment provides, can detect the zero line of alternating current power supply respectively
Dangerous voltage and ground wire between and ground wire leakage current, are more than predetermined voltage threshold and described ground wire in described dangerous voltage
In the case that leakage current is more than current threshold, control the corresponding load power down of earth leakage protective device.In this manner it is possible to according to danger
Voltage condition determines whether ground connection is reliable, and locks ground line current defencive function in the case of reliable ground, thus avoiding
The false tripping problem that current mode leakage protector is caused due to reliable ground, substantially increases the safety of earth leakage protective device.
Optionally, in step S202, the corresponding load power down of described earth leakage protective device is controlled to may include：Control electromagnetic trip
Coil is threaded off, so that the corresponding load power down of described earth leakage protective device.
Further, before controlling the corresponding load power down of earth leakage protective device, the leakage that this utility model embodiment provides
The method of work of non-electricity protector also includes the magnitude relationship of dangerous voltage described in comparison and described predetermined voltage threshold, and compares
Described ground wire leakage current and the magnitude relationship of described predetermined current threshold.
In sum, above-mentioned embodiment is not restricted embodiment of the present utility model, the technology of all this areas
Modification or equivalent deformation that personnel are carried out on the basis of flesh and blood of the present utility model, all in skill of the present utility model
Art category.
Claims (6)
1. a kind of earth leakage protective device is it is characterised in that include：
Ground wire voltage test section, for detecting the dangerous voltage between the zero line of alternating current power supply and ground wire；
Leakage current test portion, for detecting ground wire leakage current；
Dropout control unit, is connected with described ground wire voltage test section and described leakage current test portion, respectively in described danger
Dangerous voltage is more than predetermined voltage threshold and described ground wire leakage current is more than in the case of predetermined current threshold, controls described electric leakage
The corresponding load power down of protector.
2. earth leakage protective device as claimed in claim 1 is it is characterised in that described ground wire voltage test section is connected across ground wire and zero
Between line, for detecting the dangerous voltage between ground wire-zero line.
3. earth leakage protective device as claimed in claim 1 is it is characterised in that described dropout control unit is specifically in described ground wire
In the case that leakage current is more than predetermined current threshold, and described dangerous voltage is more than predetermined voltage threshold, control electromagnetic trip
Coil is threaded off, so that the corresponding load power down of described earth leakage protective device.
4. earth leakage protective device as claimed in claim 1 is it is characterised in that also include comparing section, respectively with described ground wire voltage
Test section, described leakage current test portion and described dropout control unit are connected, default with described for relatively described dangerous voltage
The magnitude relationship of voltage threshold, and compare the magnitude relationship of described ground wire leakage current and described predetermined current threshold.
5. the earth leakage protective device as any one of Claims 1-4 is it is characterised in that also include zero sequence detection of electrical leakage portion,
For detecting the zero sequence leakage current between zero line-live wire, in the case that described zero sequence leakage current is more than default zero sequence threshold value, control
Electromagnetic trip coil processed is threaded off, so that the corresponding load power down of described earth leakage protective device.
6. the earth leakage protective device as any one of Claims 1-4 is it is characterised in that described dropout control unit is also connected with
There is high-temperature protection circuit, described high-temperature protection circuit is used for, in the case that pin temperature is higher than preset temperature threshold value, controlling electricity
Magnetic tripping coil is threaded off, so that the corresponding load power down of described earth leakage protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621042402.9U CN205992726U (en) | 2016-09-07 | 2016-09-07 | A kind of earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621042402.9U CN205992726U (en) | 2016-09-07 | 2016-09-07 | A kind of earth leakage protective device |
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| Publication Number | Publication Date |
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| CN205992726U true CN205992726U (en) | 2017-03-01 |
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| CN201621042402.9U Active CN205992726U (en) | 2016-09-07 | 2016-09-07 | A kind of earth leakage protective device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253217A (en) * | 2016-09-07 | 2016-12-21 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device and method of work thereof |
| CN107462804A (en) * | 2017-09-26 | 2017-12-12 | 捍防（苏州）实业有限公司 | A kind of Electrical Safety analytical equipment |
| CN107727987A (en) * | 2017-09-26 | 2018-02-23 | 捍防（苏州）实业有限公司 | A kind of Electrical Safety analysis method |
-
2016
- 2016-09-07 CN CN201621042402.9U patent/CN205992726U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253217A (en) * | 2016-09-07 | 2016-12-21 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device and method of work thereof |
| CN107462804A (en) * | 2017-09-26 | 2017-12-12 | 捍防（苏州）实业有限公司 | A kind of Electrical Safety analytical equipment |
| CN107727987A (en) * | 2017-09-26 | 2018-02-23 | 捍防（苏州）实业有限公司 | A kind of Electrical Safety analysis method |
| CN107727987B (en) * | 2017-09-26 | 2019-11-05 | 捍防（苏州）实业有限公司 | A kind of Electrical Safety analysis method |
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