CN108565830A - Active multifunctional electric leakage protector - Google Patents
Active multifunctional electric leakage protector Download PDFInfo
- Publication number
- CN108565830A CN108565830A CN201810746582.6A CN201810746582A CN108565830A CN 108565830 A CN108565830 A CN 108565830A CN 201810746582 A CN201810746582 A CN 201810746582A CN 108565830 A CN108565830 A CN 108565830A
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- CN
- China
- Prior art keywords
- normally
- zero curve
- firewire
- closed contact
- electric leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0069—Details of emergency protective circuit arrangements concerning transmission of signals by means of light or heat rays
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of active multifunctional electric leakage protectors, including decision circuitry, disconnection device, firewire L, zero curve N and ground wire, its main feature is that：It disconnects the first normally-closed contact for including in device and the second normally-closed contact is serially connected in respectively on firewire L and zero curve N.There is luminous component one end of a photoelectrical coupler to be connected on ground wire, the other end is connected between the second normally-closed contact and the power connector end of zero curve N, the photo resistance R1 of photoelectrical coupler is connected to the input terminal of decision circuitry, and the output end of decision circuitry is electrically connected with device is disconnected.The luminous component of leakage condition, photoelectrical coupler is powered, and the first normally-closed contact and the second normally-closed contact that device is disconnected described in decision circuitry active control are opened, and the firewire L and zero curve N is kept to be disconnected with the load, avoid the generation of human electric shock's accident.It is at low cost, reliable for operation using photoelectrical coupler as detecting element.In addition, also increasing overtemperature protection device, realize multi-functional.
Description
Technical field
The invention belongs to general electronic corporation technical fields, are related to earth leakage protective device, specifically a kind of active multi-functional leakage
Non-electricity protector.
Background technology
Current earth leakage protective device is human body（Or other conductors）It is designed as a circuit, principle is to utilize
Whether the electric current that mutual inductor detection flows in and out electrical appliance is consistent, and it is phase that when leakproof, which flows in and out the current value of electrical appliance,
With, when leaking electricity, leakage current can pass through human body and flow into the earth, and the electric current for flowing in and out mutual inductor at this time has occurred
Difference, then buckle releaser main switch can be disconnected, realize the function of power-off protection.Namely：Just meeting when only human body touches electric appliance
Forming circuit starts buckle releaser deenergization, even if human body does not touch electric appliance circuit, leakage tripping device will not act.Therefore, this
Earth leakage protective device belongs to passive-type earth leakage protective device, and core component is to detect whether to leak electricity using mutual inductor.
In general, safely disconnecting the time when electric leakage only has 0.1 second, the existing earth leakage protective device actual switch-off time is long,
The causing death's accident that shocks by electricity can be occurred by leading to the electric appliance with earth leakage protective device also, the main reason is that the switch contact of buckle releaser is
It is powered for a long time, is often adhered, causes turn-off time elongated or can not disconnect.
It directly turns off or connects in addition, current Overtemp. protector is usually bimetal leaf material, electric current is direct
Flow through contact.This mode is suitably applied in low current circuit, and when electric current is bigger, high current, which flows through bimetal leaf, to be made
Connect at contact is molten, contact can not often disconnect.In addition, the volume of high current temperature controller is also bigger, space when contact heating body
Often it is restricted.
So that earth leakage protective device is realized active earth leakage protective, improve security reliability, earth leakage protective device and overtemperature are protected
It protects device to organically combine, improves performance.This is current this field technical problem urgently to be resolved hurrily.
Invention content
The present invention is to solve the above problem of the existing technology, provides a kind of active multifunctional electric leakage protector, no
Human body is needed to be formed into a loop, as long as circuit leaks electricity, the main switch for connecting load will disconnect, and improve security reliability,
Avoid the generation of human electric shock's accident.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of active multifunctional electric leakage protector, including decision circuitry, disconnect device, one end and power supply connection, the other end with
Load firewire L, zero curve N and the ground wire of connection, which is characterized in that the first normally-closed contact K1 for including in the disconnection device
It is serially connected in respectively on the firewire L and zero curve N with the second normally-closed contact K2；Earth leakage protective device further includes photoelectrical coupler, described
Luminous component one end of photoelectrical coupler be connected on the ground wire, the other end is connected to the second normally-closed contact K2 and institute
It states on the zero curve N between the power connector end of zero curve N, the photo resistance R1 of the photoelectrical coupler 1, which is connected to, described to be sentenced
The input terminal of deenergizing, the output end of the decision circuitry are electrically connected with the disconnection device；Leakage condition, the photoelectric coupling
The luminous component of device 1 is powered, and the first normally-closed contact K1 and second that device is disconnected described in the decision circuitry active control is normal
Closed contact K2 is opened, and the firewire L and zero curve N is kept to be disconnected with the load.
A kind of improvement to above-mentioned technical proposal：The decision circuitry include DC power supplier, operational amplifier F and
Its biasing circuit, the disconnection device includes buckle releaser, and the photo resistance R1 of the photoelectrical coupler is connected to the fortune
The signal input part of amplifier F is calculated, the signal output end of the operational amplifier F is connected to the buckle releaser.
The another kind of above-mentioned technical proposal is improved：The decision circuitry includes DC power supplier and operational amplifier
F and its biasing circuit；The disconnection device includes intermediate relay J, triode D and its biasing circuit, the intermediate relay
Device J includes two normally-closed contacts of two normally-closed contacts and normally opened contact a J3, the intermediate relay J as described the
One normally-closed contact K1 and the second normally-closed contact K2；The photo resistance R1 of the photoelectrical coupler is connected to the operational amplifier
The signal input part of F, the signal output end of the operational amplifier F are connect with the base stage b of the triode D, the centre after
The coil tandem of electric appliance J is between the working power that the collector c of the triode D and the DC power supplier provide, institute
The one end for stating normally opened contact J3 is connect with the collector c of the triode D, the normally opened contact J3 other ends and a normally closed button
One end of K connects, and the other end of the normally closed button K with working power is connect.
Increase above-mentioned technical proposal a kind of improvement of overtemperature prote：There are one end and the working power of an overtemperature protection device
Connection, the other end are connect with the buckle releaser, and the overtemperature protection device is low current open type temperature detect switch (TDS).
Increase the another of overtemperature prote to above-mentioned technical proposal to improve：There are one end and the work electricity of an overtemperature protection device
It connects to source, the other end is connect with the collector c of the coil of the intermediate relay J and triode D, the overtemperature protection device
For low current open type temperature detect switch (TDS).
Above-mentioned technical proposal is further improved：The decision circuitry includes regulation resistance R2.Adjustable operation is put
The output sensitivity of big device F namely earth leakage protective sensitivity.
Above-mentioned technical proposal is further improved：Each component of the earth leakage protective device is arranged in box body, the box
Pcb board is set in body, and each component of the earth leakage protective device is mounted on the pcb board, the firewire L, zero curve N and ground wire
Power connector end is drawn from one end of the shell, and the firewire L and zero curve N loads connecting pin are drawn from the shell other end
Go out, the box body cover face setting reset switch, indicator light key, the reset switch be the buckle releaser reset switch or
The normally closed button K of the intermediate relay J connections, the indicator light is LED light, and is connect with working power.
The present invention compared with prior art the advantages of and good effect be：
1, the present invention has thoroughly overturned the operation principle of current earth leakage protective device, and basic principle of the invention is to use luminous component
It is connected to zero curve and ground wire, detects whether to leak electricity using photo resistance, uses executive device deenergization after electric leakage at once.Because
Do not need human body forming circuit, therefore, after leaking electricity just disconnection, we can it be referred to as active earth leakage protective device.Its core
Center portion part is photo resistance.Once circuit leaks electricity, the photo resistance R1 in photoelectrical coupler is fast by the resistance value after illumination
Speed reduces, and the output signal driving breaker device work of operational amplifier F makes the first normally-closed contact K1 and second export normally closed touch
Point K2 is disconnected, and actively loads connection（Electrical appliance）Firewire L and zero curve N disconnect, thoroughly avoid human electric shock's accident
Occur.
2, the present invention uses photoelectrical coupler as detecting element, small, at low cost, reliable for operation.
3, the present invention is connect using low current open type temperature detect switch (TDS) with buckle releaser, or is connected between the line of relay
It encloses in circuit, temperature detect switch (TDS) closure makes intermediate relay work when overtemperature, is led back using the normally-closed contact cut-out of intermediate relay
Road, overcomes that high current Overtemp. protector volume is big, the molten disadvantage connected in contact.
4, the present invention makes full use of buckle releaser in earth leakage protective device using low current temperature detect switch (TDS) as overtemperature protection device
Break function, it is at low cost, safe and reliable to operation.
Description of the drawings
Fig. 1 is the electrical block diagram of the active multifunctional electric leakage protector of the present invention；
Fig. 2 is the circuit diagram of active multifunctional electric leakage protector embodiment 1 of the invention；
Fig. 3 is the circuit diagram of active multifunctional electric leakage protector embodiment 2 of the invention；
Fig. 4 is the circuit diagram of active multifunctional electric leakage protector embodiment 3 of the invention；
Fig. 5 is the circuit diagram of active multifunctional electric leakage protector embodiment 4 of the invention.
Figure label is：1- photoelectrical couplers, 2- decision circuitries, 3- disconnect device, 4- DC power suppliers, 5- overtemperatures and protect
Protection unit.
Specific implementation mode
Below in conjunction with attached drawing, present invention is further described in detail：Overtemp. protector 5
Referring to Fig. 1, a kind of specific implementation mode of active multifunctional electric leakage protector of the present invention, including decision circuitry 2, disconnection
Firewire L, zero curve N and the ground wire that device 3, one end and power supply connection, the other end are connected with load.It is wrapped in the disconnection device 3
The the first normally-closed contact K1 and the second normally-closed contact K2 contained is serially connected in respectively on the firewire L and zero curve N；Earth leakage protective device also wraps
Photoelectrical coupler 1 is included, luminous component one end of the photoelectrical coupler 1 is connected on the ground wire, and the other end is connected to institute
It states on the zero curve N between the second normally-closed contact K2 and the power connector end of the zero curve N, the light of the photoelectrical coupler 1
Quick resistance R1 is connected to the input terminal of the decision circuitry 2, and the output end of the decision circuitry 2 is electrically connected with the disconnection device 3
It connects；The luminous component of leakage condition, the photoelectrical coupler 1 is powered, and device is disconnected described in 2 active control of the decision circuitry
3 the first normally-closed contact K1 and the second normally-closed contact K2 are opened, and the firewire L and zero curve N is kept to be disconnected with the load.
Referring to Fig. 2, a kind of specific embodiment 1 of active multifunctional electric leakage protector of the present invention：With above-mentioned specific implementation
The structure of mode is essentially identical, specifically：Above-mentioned decision circuitry 2 include DC power supplier 4, operational amplifier F and its partially
Circuits, it includes buckle releaser to disconnect device 3, and the photo resistance R1 of photoelectrical coupler 1 is connected to the signal of the operational amplifier F
The signal output end of input terminal, the operational amplifier F is connected to buckle releaser 3.
Referring to Fig. 3, a kind of specific embodiment 2 of active multifunctional electric leakage protector of the present invention：With above-described embodiment 1
Structure is essentially identical, only increases overtemperature protection device, overtemperature protection device is low current open type temperature detect switch (TDS) 5, described
One end of the normally opened temperature detect switch (TDS) of low current 5 is connect with working power, and the other end is connect with the buckle releaser.
Referring to Fig. 4, a kind of specific embodiment 3 of active multifunctional electric leakage protector of the present invention：With above-mentioned specific implementation
The structure of mode is essentially identical, specifically：The decision circuitry 2 include DC power supplier 4 and operational amplifier F and its
Biasing circuit；The disconnection device 3 includes intermediate relay J, triode D and its biasing circuit, the intermediate relay J packets
Two normally-closed contacts for including two normally-closed contacts and normally opened contact a J3, the intermediate relay J are normal as described first
Closed contact K1 and the second normally-closed contact K2；The photo resistance R1 of the photoelectrical coupler 1 is connected to the operational amplifier F's
Signal input part, the signal output end of the operational amplifier F are connect with the base stage b of the triode D, the intermediate relay
The coil tandem of J is described normal between the working power that the collector c and the DC power supplier 4 of the triode D are provided
The one end for opening contact J3 is connect with the collector c of the triode D, the normally opened contact J3 other ends and a normally closed button K's
One end connects, and the other end of the normally closed button K with working power is connect.
Referring to Fig. 5, a kind of specific embodiment 4 of active multifunctional electric leakage protector of the present invention：With above-described embodiment 3
Structure is essentially identical, only increases overtemperature protection device, and the overtemperature protection device is low current open type temperature detect switch (TDS)
5, one end of the normally opened temperature detect switch (TDS) of the low current 5 with working power is connect, the coil of the other end and the intermediate relay J
And the collector c connections of triode D.
The present invention photoelectrical coupler 1 luminous component be LED light, neon lamp or other similar to light-emitting component.Photoelectric coupling
The photo resistance R1 of device 1 leads to its resistance variations by luminous component light varience, and volume very little, cost is very low, and operation can
It leans on.The active multifunctional electric leakage protector of the present invention connects load（Electrical appliance）Afterwards, when circuit leakproof, there is no electric current on ground wire
It flows through, the luminous component of photoelectrical coupler 1 does not work, and the resistance value of the photo resistance R1 of photoelectrical coupler 1 is relatively high, operational amplifier
The output signal of F is not enough to driving magnetictrip 3（Or intermediate relay J）Work.When circuit leaks electricity, luminous component is powered
It is lit, photo resistance R1 is reduced rapidly by the resistance value after illumination（When reaching setting resistance value）, the output letter of operational amplifier F
Number driving magnetictrip 3（Or intermediate relay J）Work, the first normally-closed contact K1 and the second normally-closed contact K2 remain open shape
State actively loads connection（Electrical appliance）Firewire L and zero curve N disconnect, do not need human body forming circuit, you can guarantee will not be sent out
Raw electric shock accidents.
As Figure 2-Figure 5, decision circuitry 2 includes regulation resistance R2, and the output that operational amplifier F is adjusted is sensitive
Degree namely earth leakage protective sensitivity.
A kind of each component of active multifunctional electric leakage protector of the present invention is arranged in box body, is arranged in the box body
Each component of pcb board, the earth leakage protective device is mounted on the pcb board, and the power supply of the firewire L, zero curve N and ground wire connects
End is drawn from one end of the shell, and the firewire L and zero curve N loads connecting pin are drawn from the shell other end, the box
Body covers face setting reset switch, indicator light key, and the reset switch is the reset switch of the buckle releaser or the centre
The normally closed button K of relay J connections, the indicator light is LED light, and is connect with working power.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, the art
Those of ordinary skill, made variations, modifications, additions or substitutions, also belong to the present invention in the essential scope of the present invention
Protection domain.
Claims (8)
1. a kind of active multifunctional electric leakage protector, including decision circuitry, disconnection device, one end and power supply connection, the other end
With firewire L, zero curve N and the ground wire of load connection, which is characterized in that the first normally-closed contact for including in the disconnection device
K1 and the second normally-closed contact K2 are serially connected in respectively on the firewire L and zero curve N；Earth leakage protective device further includes photoelectrical coupler, institute
The luminous component one end for the photoelectrical coupler stated is connected on the ground wire, the other end be connected to the second normally-closed contact K2 with
On the zero curve N between the power connector end of the zero curve N, the photo resistance R1 of the photoelectrical coupler, which is connected to, described to be sentenced
The input terminal of deenergizing, the output end of the decision circuitry are electrically connected with the disconnection device；Leakage condition, the photoelectric coupling
The luminous component of device is powered, and the first normally-closed contact K1 and second that device is disconnected described in the decision circuitry active control is normally closed
Contact K2 is opened, and the firewire L and zero curve N is kept to be disconnected with the load.
2. active multifunctional electric leakage protector described in accordance with the claim 1, which is characterized in that the decision circuitry includes
DC power supplier, operational amplifier F and its biasing circuit, the disconnection device includes buckle releaser, the photoelectric coupling
The photo resistance R1 of device is connected to the signal input part of the operational amplifier F, and the signal output end of the operational amplifier F connects
It is connected to the buckle releaser.
3. active multifunctional electric leakage protector described in accordance with the claim 1, which is characterized in that the decision circuitry includes
DC power supplier and operational amplifier F and its biasing circuit；The disconnection device include intermediate relay J, triode D and
Its biasing circuit, the intermediate relay J include two normally-closed contacts and a normally opened contact J3, the intermediate relay J's
Two normally-closed contacts are as the first normally-closed contact K1 and the second normally-closed contact K2；The photosensitive electricity of the photoelectrical coupler
Resistance R1 is connected to the signal input part of the operational amplifier F, signal output end and the triode of the operational amplifier F
The base stage b connections of D, the collector c and the DC power supply mould of the coil tandem of the intermediate relay J in the triode D
Between the working power that block provides, one end of the normally opened contact J3 is connect with the collector c of the triode D, described normally opened
The contact J3 other ends are connect with one end of a normally closed button K, and the other end of the normally closed button K with working power is connect.
4. active multifunctional electric leakage protector according to claim 2, which is characterized in that there is an overtemperature protection device
One end is connect with working power, and the other end is connect with the buckle releaser, and the overtemperature protection device is low current open type temperature control
Switch.
5. active multifunctional electric leakage protector described in accordance with the claim 3, which is characterized in that there is an overtemperature protection device
One end with working power is connect, and the other end is connect with the collector c of the coil of the intermediate relay J and triode D, described
Overtemperature protection device is low current open type temperature detect switch (TDS).
6. according to the active multifunctional electric leakage protector of claim 1-5 any one of them, which is characterized in that the judgement electricity
Road includes regulation resistance R2.
7. according to the active multifunctional electric leakage protector of claim 2-5 any one of them, which is characterized in that the electric leakage is protected
Each component for protecting device is arranged in box body, pcb board is arranged in the box body, each component of the earth leakage protective device is mounted on described
On pcb board, the power connector end of the firewire L, zero curve N and ground wire is drawn from one end of the shell, the firewire L and zero curve
N loads connecting pin is drawn from the shell other end, and reset switch, indicator light key is arranged in the face of covering of the box body, described multiple
Bit switch is the reset switch of the buckle releaser or the normally closed button K of the intermediate relay J connections, and the indicator light is LED
Lamp, and connect with working power.
8. active multifunctional electric leakage protector according to claim 6, which is characterized in that the earth leakage protective device it is each
Component is arranged in box body, and pcb board is arranged in the box body, and each component of the earth leakage protective device is mounted on the pcb board,
The power connector end of the firewire L, zero curve N and ground wire is drawn from one end of the shell, and the firewire L and zero curve N loads connect
It connects end to draw from the shell other end, the box body covers face setting reset switch, indicator light key, and the reset switch is
The reset switch of the buckle releaser or the normally closed button K of the intermediate relay J connections, the indicator light are LED light, and and work
Make power supply connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810746582.6A CN108565830A (en) | 2018-07-09 | 2018-07-09 | Active multifunctional electric leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810746582.6A CN108565830A (en) | 2018-07-09 | 2018-07-09 | Active multifunctional electric leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108565830A true CN108565830A (en) | 2018-09-21 |
Family
ID=63555813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810746582.6A Pending CN108565830A (en) | 2018-07-09 | 2018-07-09 | Active multifunctional electric leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108565830A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441608A (en) * | 2019-08-28 | 2019-11-12 | 张娜 | The online insulation against ground detection device of power grid isolator three-phase and four-line and detection method |
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| CN2459229Y (en) * | 2001-01-17 | 2001-11-14 | 金玉龙 | Automatic dimmer controller for motor vehicle |
| CN201199584Y (en) * | 2007-08-29 | 2009-02-25 | 钱加灿 | All-purpose safety plug capable of preventing earth wire contact from non conducting |
| CN102522974A (en) * | 2012-01-02 | 2012-06-27 | 丁希庆 | Light-operated switching circuit |
| CN103187706A (en) * | 2011-12-28 | 2013-07-03 | 樱花卫厨（中国）股份有限公司 | Voltage detection leakage protection device for electric water heater |
| CN203367991U (en) * | 2013-07-15 | 2013-12-25 | 国家电网公司 | Motor temperature protection device |
| CN208608712U (en) * | 2018-07-09 | 2019-03-15 | 相变能源科技（青岛）有限公司 | Active multifunctional electric leakage protector |
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2018
- 2018-07-09 CN CN201810746582.6A patent/CN108565830A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2459229Y (en) * | 2001-01-17 | 2001-11-14 | 金玉龙 | Automatic dimmer controller for motor vehicle |
| CN201199584Y (en) * | 2007-08-29 | 2009-02-25 | 钱加灿 | All-purpose safety plug capable of preventing earth wire contact from non conducting |
| CN103187706A (en) * | 2011-12-28 | 2013-07-03 | 樱花卫厨（中国）股份有限公司 | Voltage detection leakage protection device for electric water heater |
| CN102522974A (en) * | 2012-01-02 | 2012-06-27 | 丁希庆 | Light-operated switching circuit |
| CN203367991U (en) * | 2013-07-15 | 2013-12-25 | 国家电网公司 | Motor temperature protection device |
| CN208608712U (en) * | 2018-07-09 | 2019-03-15 | 相变能源科技（青岛）有限公司 | Active multifunctional electric leakage protector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441608A (en) * | 2019-08-28 | 2019-11-12 | 张娜 | The online insulation against ground detection device of power grid isolator three-phase and four-line and detection method |
| CN110441608B (en) * | 2019-08-28 | 2022-03-15 | 张娜 | Three-phase four-wire online ground insulation detection device and detection method for power grid isolator |
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