CN106253217A - A kind of earth leakage protective device and method of work thereof - Google Patents
A kind of earth leakage protective device and method of work thereof Download PDFInfo
- Publication number
- CN106253217A CN106253217A CN201610807907.8A CN201610807907A CN106253217A CN 106253217 A CN106253217 A CN 106253217A CN 201610807907 A CN201610807907 A CN 201610807907A CN 106253217 A CN106253217 A CN 106253217A
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- Prior art keywords
- ground wire
- protective device
- voltage
- earth leakage
- leakage protective
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
Abstract
The present invention provides a kind of earth leakage protective device and method of work thereof, relates to electrical engineering technical field, it is possible to solve the earth leakage protective device irregular working that the sudden change occurred 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, is used for detecting ground wire leakage current；Dropout control portion; it is connected with described ground wire voltage test section and described leakage current test portion respectively; in the case of being more than predetermined current threshold at described dangerous voltage more than predetermined voltage threshold and described ground wire leakage current, control the load power down that described earth leakage protective device is corresponding.
Description
Technical field
The present invention relates to a kind of electric safety device, particularly to a kind of earth leakage protective device and method of work thereof.
Background technology
The defencive function of earth leakage protective device, refers on the premise of power supply is normal, when ground wire abnormal belt electricity or load
During electric leakage, it is possible to cut off load supplying loop.
Existing three earth leakage protective devices that extremely break 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.Requiring there is reliable ground system when voltage-type uses, current mode must be then nothing
Can use during reliable ground.Voltage-type and current mode improper use will cause misoperation even can not use, and carry for user
Carry out huge potential safety hazard.
Summary of the invention
In order to solve the problems referred to above, this programme provides a kind of earth leakage protective device and method of work thereof, it is possible to solve because making
Earth leakage protective device irregular working that the sudden change occurred with improper or power utilization environment causes and the hidden danger brought.
On the one hand, the present invention provides a kind of earth leakage protective device, including: ground wire voltage test section, it is used for detecting alternating current power supply
Zero line and ground wire between dangerous voltage；Leakage current test portion, is used for detecting ground wire leakage current；Dropout control portion, respectively
It is connected with described ground wire voltage test section and described leakage current test portion, for being more than predeterminated voltage threshold at described dangerous voltage
Value and described ground wire leakage current, more than in the case of predetermined current threshold, control load corresponding to described earth leakage protective device and break
Electricity.
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 portion is specifically for being more than predetermined current threshold, and institute at described ground wire leakage current
State dangerous voltage more than in the case of predetermined voltage threshold, control electromagnetic trip coil and thread 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 portion are connected, and the size for relatively described dangerous voltage with described predetermined voltage threshold is closed
System, and relatively described ground wire leakage current and the magnitude relationship of 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 of described zero sequence leakage current is more than presetting zero sequence threshold value, controls electromagnetic trip coil and threads off, so that institute
State the load power down that earth leakage protective device is corresponding.
Further, described dropout control portion is also associated with high-temperature protection circuit, and described high-temperature protection circuit is for inserting
Foot temperature, higher than in the case of preset temperature threshold value, controls electromagnetic trip coil and threads off, so that described earth leakage protective device is corresponding
Load power down.
On the other hand, embodiments of the invention also provide for the method for work of a kind of earth leakage protective device, including: detect friendship respectively
Dangerous voltage between zero line and the ground wire of stream power supply and ground wire leakage current；At described dangerous voltage more than predeterminated voltage threshold
Value and described ground wire leakage current, more than in the case of predetermined current threshold, control load corresponding to described earth leakage protective device and break
Electricity.
Optionally, the load power down that the described earth leakage protective device of described control is corresponding includes: controls electromagnetic trip coil and threads off,
So that the load power down that described earth leakage protective device is corresponding.
Further, before controlling the load power down that described earth leakage protective device is corresponding, also include dangerous electricity described in comparison
Pressure and the magnitude relationship of described predetermined voltage threshold, and relatively described ground wire leakage current and described predetermined current threshold is big
Little relation.
The earth leakage protective device of embodiment of the present invention offer and method of work, ground wire voltage test section, it is possible to detection exchange
Dangerous voltage between zero line and the ground wire of power supply；Leakage current test portion, it is possible to detection ground wire leakage current；Dropout control portion,
Can described dangerous voltage more than predetermined voltage threshold and described ground wire leakage current more than predetermined current threshold in the case of,
Control the load power down that described earth leakage protective device is corresponding.In this manner it is possible to determine that ground connection whether may be used according to dangerous voltage situation
Lean on, and in the case of reliable ground, lock ground line current defencive function, thus avoid current mode leakage protector due to can
The false tripping problem caused with being abutted against, substantially increases the safety of earth leakage protective device.
Accompanying drawing explanation
A kind of structural representation of the earth leakage protective device that Fig. 1 provides for the embodiment of the present invention；
A kind of detailed construction schematic diagram of the earth leakage protective device that Fig. 2 provides for the embodiment of the present invention；
The another kind of detailed construction schematic diagram of the earth leakage protective device that Fig. 3 provides for the embodiment of the present invention；
Fig. 4 is a kind of circuit theory diagrams that the earth leakage protective device in Fig. 2 is corresponding；
A kind of flow chart of the method for work of the earth leakage protective device that Fig. 5 provides for the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is described in further detail.Hereinafter implement
Example is used for illustrating the present invention, but is not limited to the scope of the present invention.
As it is shown in figure 1, embodiments of the invention provide 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, is used for detecting ground wire leakage current；
Dropout control portion 13, is connected with described ground wire voltage test section and described leakage current test portion respectively, is used for
In the case of described dangerous voltage is more than predetermined current threshold more than predetermined voltage threshold and described ground wire leakage current, control institute
State the load power down that earth leakage protective device is corresponding.
The earth leakage protective device that the embodiment of the present invention provides, ground wire voltage test section 11, it is possible to the zero line of detection alternating current power supply
And the dangerous voltage between ground wire；Leakage current test portion 12, it is possible to detection ground wire leakage current；Dropout control portion 13, it is possible to
In the case of described dangerous voltage is more than predetermined current threshold more than predetermined voltage threshold and described ground wire leakage current, control institute
State the load power down that earth leakage protective device is corresponding.In this manner it is possible to determine that ground connection is the most reliable according to dangerous voltage situation, and
Lock ground line current defencive function in the case of reliable ground, thus avoid current mode leakage protector and make due to reliable ground
The false tripping problem become, substantially increases 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, be used for detecting ground wire-
Dangerous voltage between zero line.
Leakage current test portion 12, is specially the electric current induction coil close to each other with ground wire, can sense on ground wire in real time
Curent change.
Concrete, dropout control portion 13 can be connected with tripping coil, by the control of electric current in tripping coil,
Realize the disconnection to line switching, thus the load to earth leakage protective device is corresponding carries out power-off.
Such as, in one embodiment of the invention, dropout control portion 13 is controlled by ground wire voltage test section 11 and electric leakage
Stream test section 12, at ground wire leakage current more than predetermined current threshold, and dangerous voltage is more than in the case of predetermined voltage threshold,
Electromagnetic trip coil can be controlled thread off, so that the load power down that described earth leakage protective device is corresponding.
Further, in one embodiment of the invention, earth leakage protective device may also include comparing section, respectively with ground wire electricity
Pressure test section 11, leakage current test portion 12 and dropout control portion 13 are connected, and preset with described for relatively described dangerous voltage
The magnitude relationship of voltage threshold, and relatively described ground wire leakage current and the magnitude relationship of described predetermined current threshold, and root
Dropout control portion 13 action is triggered according to comparative result.
Further, the earth leakage protective device that the embodiment of the present invention provides, may also include zero sequence detection of electrical leakage portion, be used for detecting
Zero sequence leakage current between zero line-live wire, in the case of described zero sequence leakage current is more than presetting zero sequence threshold value, controls electromagnetism and takes off
Fastening wire circle is threaded off, so that the load power down that described earth leakage protective device is corresponding.
Further, in the earth leakage protective device that the embodiment of the present invention provides, dropout control portion 13 also can connect high temperature dwell
Protection circuit, described high-temperature protection circuit can be used for, in the case of pin temperature is higher than preset temperature threshold value, controlling electromagnetic trip
Coil is threaded off, so that the load power down that described earth leakage protective device is corresponding.
Optionally, earth leakage protective device also can arrange condition indication circuit and buzzer, condition indication circuit is used for indicating
The running status of current whole protector, including the display of fault, buzzer plays alarm function.
The earth leakage protective device provided the present invention below by specific embodiment is described in detail.
As shown in Figures 2 and 3, in the present embodiment, earth leakage protective device comprises the steps that 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 that live wire, Ni represent that zero line, Ei represent 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 analysis, 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 locks 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；Otherwise, when the voltage between Ni-Ei is more than predeterminated voltage, the exportable low level of ground wire voltage change-over circuit
Activate ground wire detection of electrical leakage module, 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 the most outwards to export, when receiving the low level of ground wire voltage change-over circuit output, unlock and by current detecting result
Outwards transmission.The ground wire leakage current detected when ground wire detection of electrical leakage module 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 at described zero sequence leakage current
In the case of default zero sequence threshold value, control electromagnetic trip coil and thread off, so that the load power down that described earth leakage protective device is corresponding.
High temperature protection control module, can detect whether earth leakage protective device plug temperature is higher than preset temperature threshold value, when inserting
Then output drive signal when head temperature exceedes preset temperature threshold value, makes earth leakage protective device trip.
Electric leakage dropout control module, is used for performing tripping operation dropout and drives use, it is possible to receive from zero sequence electric leakage module, ground
Line electric leakage module, in high temperature protection control module, the execution of either signal is threaded off and is protected.
Fig. 4 is the circuit theory diagrams that Fig. 2 is corresponding.As shown in Figure 4, detect between Ni-Ei when ground wire electrified detection module
Terminal voltage less than preset value (such as 36v) time, export low-voltage, after ground wire voltage change-over circuit, export high level, this height
Level is through Q1 and makes its saturation conduction, causes U1_4 foot the most short-circuit, and now ground line current also cannot make U1_7 foot defeated greatly again
Going out high level, therefore ground line current is locked, it is impossible to carries out current detecting work, solves plain edition three pole power-off flow pattern product
The false tripping problem caused because of reliable ground.
When ground wire electrified detection module detects the terminal voltage between Ni-Ei more than preset value (such as 36v), the high electricity of output
Pressure, this high voltage makes the output of ground wire voltage change-over circuit be converted into low level, and this low level makes Q1 end, thus causes and connect
Open-circuit condition is presented at U1_4 foot Q1.If now have ground line current flow through ZCT2 coil and be more than default ground line current, U2_4
Foot output constant current charges to C5, and when C5 terminal voltage reaches predeterminated voltage, U1_7 foot output high level, this high voltage is through D1
Making SCR1 triggering and conducting, tripping coil obtains electricity adhesive, and 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 it is shown in figure 5, embodiments of the invention also provide for the method for work of a kind of earth leakage protective device, including:
S201, detects the dangerous voltage between the zero line of alternating current power supply and ground wire and ground wire leakage current respectively；
S202, is more than predetermined current threshold at described dangerous voltage more than predetermined voltage threshold and described ground wire leakage current
In the case of, control the load power down that described earth leakage protective device is corresponding.
The method of work of the earth leakage protective device that the embodiment of the present invention provides, it is possible to detect zero line and the ground of alternating current power supply respectively
Dangerous voltage between line and ground wire leakage current, at described dangerous voltage more than predetermined voltage threshold and the electric leakage of described ground wire
Electric current, more than in the case of current threshold, controls the load power down that earth leakage protective device is corresponding.In this manner it is possible to according to dangerous voltage
Situation determines that ground connection is the most reliable, and locks ground line current defencive function in the case of reliable ground, thus avoids electricity
The false tripping problem that flow pattern earth leakage protective device causes due to reliable ground, substantially increases the safety of earth leakage protective device.
Optionally, in step S202, control load power down corresponding to described earth leakage protective device and comprise the steps that control electromagnetic trip
Coil is threaded off, so that the load power down that described earth leakage protective device is corresponding.
Further, before controlling the load power down that earth leakage protective device is corresponding, the electric leakage that the embodiment of the present invention provides is protected
The method of work protecting device also includes the magnitude relationship of dangerous voltage described in comparison and described predetermined voltage threshold, and the most described
Ground wire leakage current and the magnitude relationship of described predetermined current threshold.
In sum, above-mentioned embodiment is not the restricted embodiment of the present invention, all those skilled in the art
The modification carried out on the basis of the flesh and blood of the present invention or equivalent deformation, all at the technology category of the present invention.
Claims (9)
1. an earth leakage protective device, it is characterised in that including:
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, is used for detecting ground wire leakage current；
Dropout control portion, is connected with described ground wire voltage test section and described leakage current test portion respectively, in described danger
In the case of danger voltage is more than predetermined current threshold more than predetermined voltage threshold and described ground wire leakage current, control described electric leakage
The load power down that protector is corresponding.
2. earth leakage protective device as claimed in claim 1, 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, it is characterised in that described dropout control portion is specifically at described ground wire
Leakage current is more than predetermined current threshold, and described dangerous voltage is more than in the case of predetermined voltage threshold, controls electromagnetic trip
Coil is threaded off, so that the load power down that described earth leakage protective device is corresponding.
4. earth leakage protective device as claimed in claim 1, 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 portion are connected, and preset with described for relatively described dangerous voltage
The magnitude relationship of voltage threshold, and relatively described ground wire leakage current and the magnitude relationship of described predetermined current threshold.
5. the earth leakage protective device as according to any one of Claims 1-4, 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 of described zero sequence leakage current is more than presetting zero sequence threshold value, control
Electromagnetic trip coil processed is threaded off, so that the load power down that described earth leakage protective device is corresponding.
6. the earth leakage protective device as according to any one of Claims 1-4, it is characterised in that described dropout control portion is also connected with
Having high-temperature protection circuit, described high-temperature protection circuit, in the case of in pin temperature higher than preset temperature threshold value, controls electricity
Magnetic tripping coil is threaded off, so that the load power down that described earth leakage protective device is corresponding.
7. the method for work of an earth leakage protective device, it is characterised in that including:
Detect the dangerous voltage between the zero line of alternating current power supply and ground wire and ground wire leakage current respectively；
In the case of described dangerous voltage is more than predetermined current threshold more than predetermined voltage threshold and described ground wire leakage current,
Control the load power down that described earth leakage protective device is corresponding.
8. method as claimed in claim 7, it is characterised in that the load power down bag that the described earth leakage protective device of described control is corresponding
Include: control electromagnetic trip coil and thread off, so that the load power down that described earth leakage protective device is corresponding.
9. method as claimed in claim 7, it is characterised in that control load power down corresponding to described earth leakage protective device it
Before, also include the magnitude relationship of dangerous voltage described in comparison and described predetermined voltage threshold, and relatively described ground wire electric leakage electricity
Stream and the magnitude relationship of described predetermined current threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807907.8A CN106253217A (en) | 2016-09-07 | 2016-09-07 | A kind of earth leakage protective device and method of work thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807907.8A CN106253217A (en) | 2016-09-07 | 2016-09-07 | A kind of earth leakage protective device and method of work thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN106253217A true CN106253217A (en) | 2016-12-21 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610807907.8A Withdrawn CN106253217A (en) | 2016-09-07 | 2016-09-07 | A kind of earth leakage protective device and method of work thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849005A (en) * | 2017-03-30 | 2017-06-13 | 乐清市诚富电器科技有限公司 | A kind of intelligent leakage protector controls circuit and control method |
| CN106981859A (en) * | 2017-03-30 | 2017-07-25 | 乐清市诚富电器科技有限公司 | A kind of ground line current locking-type earth leakage protective device control method |
| CN107769158A (en) * | 2017-09-27 | 2018-03-06 | 余姚市嘉荣电子电器有限公司 | A kind of safe leakage protection circuit |
| CN108400571A (en) * | 2018-04-24 | 2018-08-14 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device of leakage-current alarm |
| CN109149515A (en) * | 2018-11-07 | 2019-01-04 | 珠海格力电器股份有限公司 | Leakage protection system and control method, the electric appliance of electric appliance |
| CN110389273A (en) * | 2018-04-22 | 2019-10-29 | 劳秋意 | A kind of electricity leakage alarm |
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| JPH0576130A (en) * | 1991-09-11 | 1993-03-26 | Honda Motor Co Ltd | Ground current detector/suppressor for power distribution line |
| CN204349421U (en) * | 2014-12-23 | 2015-05-20 | 余姚市嘉荣电子电器有限公司 | With the leakage protecting plug that ground wire high voltage detects |
| CN104917146A (en) * | 2014-12-23 | 2015-09-16 | 余姚市嘉荣电子电器有限公司 | Leakage protection plug with switching circuit indication device |
| CN105896465A (en) * | 2015-09-28 | 2016-08-24 | 余姚市嘉荣电子电器有限公司 | Three-pole leakage protector and working method thereof |
| CN205992726U (en) * | 2016-09-07 | 2017-03-01 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device |
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| JPH0576130A (en) * | 1991-09-11 | 1993-03-26 | Honda Motor Co Ltd | Ground current detector/suppressor for power distribution line |
| CN204349421U (en) * | 2014-12-23 | 2015-05-20 | 余姚市嘉荣电子电器有限公司 | With the leakage protecting plug that ground wire high voltage detects |
| CN104917146A (en) * | 2014-12-23 | 2015-09-16 | 余姚市嘉荣电子电器有限公司 | Leakage protection plug with switching circuit indication device |
| CN105896465A (en) * | 2015-09-28 | 2016-08-24 | 余姚市嘉荣电子电器有限公司 | Three-pole leakage protector and working method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849005A (en) * | 2017-03-30 | 2017-06-13 | 乐清市诚富电器科技有限公司 | A kind of intelligent leakage protector controls circuit and control method |
| CN106981859A (en) * | 2017-03-30 | 2017-07-25 | 乐清市诚富电器科技有限公司 | A kind of ground line current locking-type earth leakage protective device control method |
| CN106849005B (en) * | 2017-03-30 | 2018-11-06 | 乐清市诚富电器科技有限公司 | A kind of intelligent leakage protector control circuit and control method |
| CN107769158A (en) * | 2017-09-27 | 2018-03-06 | 余姚市嘉荣电子电器有限公司 | A kind of safe leakage protection circuit |
| CN110389273A (en) * | 2018-04-22 | 2019-10-29 | 劳秋意 | A kind of electricity leakage alarm |
| CN108400571A (en) * | 2018-04-24 | 2018-08-14 | 余姚市嘉荣电子电器有限公司 | A kind of earth leakage protective device of leakage-current alarm |
| CN109149515A (en) * | 2018-11-07 | 2019-01-04 | 珠海格力电器股份有限公司 | Leakage protection system and control method, the electric appliance of electric appliance |
| CN109149515B (en) * | 2018-11-07 | 2020-09-15 | 珠海格力电器股份有限公司 | Electric leakage protection system and control method of electric appliance, and electric appliance |
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Application publication date: 20161221 |