CN109116176A - A kind of low-voltage leakage detection device and low-voltage leakage detection system - Google Patents
A kind of low-voltage leakage detection device and low-voltage leakage detection system Download PDFInfo
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- CN109116176A CN109116176A CN201811281845.7A CN201811281845A CN109116176A CN 109116176 A CN109116176 A CN 109116176A CN 201811281845 A CN201811281845 A CN 201811281845A CN 109116176 A CN109116176 A CN 109116176A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The present invention relates to detection of electrical leakage technical fields, a kind of low-voltage leakage detection device and low-voltage leakage detection system are provided, low-voltage leakage detection device includes current transformer, current transformer includes primary coil and secondary coil, the input terminal 1 of primary coil concatenates connection plug after indicator light, the input terminal 2 of primary coil connects binding post, wherein binding post connects power supply line to be measured；The output end 3 and output end 4 of secondary coil are connect with the ac input end of rectifier bridge 1 and ac input end 2 respectively, the rectification cathode output end 3 of rectifier bridge is connect with the control electrode G of silicon-controlled M, it is connected after the anode A concatenation switch S of silicon-controlled M with the anode of power supply, it is connect after the cathode K concatenation feedback oscillator and buzzer of silicon-controlled M with the cathode of power supply, the rectification cathode output end 4 of rectifier bridge is connect with power cathode, acousto-optic electric alarm is carried out to low pressure, electric leakage route to realize, reduces security risk.
Description
Technical field
The present invention relates to detection of electrical leakage technical field, specially a kind of low-voltage leakage detection device and low-voltage leakage detection system
System.
Background technique
With the development of China's economic, growth rate is swift and violent in recent years for GDP per capita, and rural area every family is continuously increased new
Electrical appliance, the behind that various electrical appliances increase is the rapidly growth of power load, since the route in part rural area is still more than ten
Year before old route and equipment, when electricity consumption increase sharply today equipment and the old of route be easy to cause transmission line of electricity voltage not
Stablize, especially peak times of power consumption voltage can be significantly lower than normal voltage, and voltage, which reduces, causes electrical appliance and transmission of electricity safety
Serious harm needs when route voltage drop is low so power supply company needs to grasp the voltage fluctuation of transmission line of electricity in time
Take necessary emergency measure.
It is not thorough in addition, rural area generally understands and implements to the specification of safety utilization of electric power, the use of newly constructed house or old house
The laying and transformation of electric line are not that the electrician personnel by profession carry out, and the connection of route inherently has the hidden of electric leakage
Suffer from, along with the surge of electrical appliance in recent years, for a large amount of route by changing privately, the serious route that leaks electricity easily causes safe thing
Therefore and cause large-area power-cuts, due to the change privately of route, the staff of power supply company checks heavy workload, and is difficult to
It was found that the route of electric leakage.
Currently, its power supply line has the old cable of recycling, the yarn gummed wire for having stranded copper wire, also has cheap aluminium core modeling packet
Line.In exposing to the weather, water logging clay coating, during reusing year after year, in order to save time, figure is convenient, and many people are normal
It is often just first to connect with the mains at home, then pulls electric wire and walk side unwrapping wire inside paddy field, electric wire telephone-moving is pulled when thrashing, or
It does not cut off the power after having worked with regard to take-up, leads to electric shock and dead accident of getting an electric shock happens occasionally.
Summary of the invention
In order to overcome the defect of the prior art as indicated above, the present inventor has made intensive studies this, is paying
After a large amount of creative works, so as to complete the present invention.
Specifically, the technical problems to be solved by the present invention are: providing a kind of low-voltage leakage detection device, it is intended to solve
The serious route that leaks electricity in the prior art, which easily causes, safety accident and causes large-area power-cuts, due to the change privately of route,
The staff of power supply company checks heavy workload, and the technical issues of be difficult to find the route of electric leakage.
In order to solve the above technical problems, the technical scheme is that
A kind of low-voltage leakage detection device, including current transformer, the current transformer include primary coil and secondary
Coil, the input terminal 1 of the primary coil concatenate connection plug after indicator light, and the input terminal 2 of the primary coil connects wiring
Column, wherein the binding post connects power supply line to be measured；
The output end 3 and output end 4 of the secondary coil respectively with the ac input end of rectifier bridge 1 and ac input end 2
Connection, the rectification cathode output end 3 of the rectifier bridge are connect with the control electrode G of silicon-controlled M, the anode A concatenation of the silicon-controlled M
Be connected after switch S with the anode of power supply, after the cathode K of silicon-controlled M concatenation feedback oscillator and buzzer with the electricity
The cathode in source connects, and the rectification cathode output end 4 of the rectifier bridge is connect with the power cathode.
As an improvement scheme, the feedback oscillator includes triode Q1 and triode Q2, the triode
The grid of Q1 is connect with the cathode K of the silicon-controlled M, and the drain electrode of the triode Q1 is connect with the grid of the triode Q2,
The source electrode of the triode Q1 is connect with the cathode of the power supply, and the drain electrode of the triode Q2 is connect with the buzzer, institute
It states and is equipped with the first current node between the drain electrode of triode Q2 and the buzzer, the route string that first current node is drawn
Connect after connecting resistance R1 and capacitor C1 with the grid of the triode Q1, the silicon-controlled M and cathode K and the triode Q1
Grid between route be equipped with the second current node, the source of route and the triode Q2 that second current node is drawn
Pole connection.
As an improvement scheme, the rectification cathode output end 3 of the rectifier bridge and the control with the silicon-controlled M
Third current node, the 4th current node and the 5th current node are successively arranged on route between pole G processed, the rectifier bridge
The route rectified between cathode output end 4 and the power cathode is equipped with the 6th current node, the 7th current node and the 8th
Current node；
Connection line between the third current node and the 6th current node is equipped with capacitor C2, the 4th electric current
Connection line between node and the 7th current node is equipped with capacitor C3, the 5th current node and the 8th electric current section
Connection line between point is equipped with diode D1.
As an improvement scheme, the trigger current value of the silicon-controlled M is 3mA.
As an improvement scheme, the contribution of the current transformer is 2W-3W, and the voltage rating of the indicator light is
220V, power 5W.
Another object of the present invention is to provide a kind of low-voltage leakage detection system, including monitoring center and respectively with it is described
Several low-voltage leakage detection devices of monitoring center connection；
The low-voltage leakage detection device includes current transformer, and the current transformer includes primary coil and secondary wire
Circle, the input terminal 1 of the primary coil concatenate connection plug after indicator light, and the input terminal 2 of the primary coil connects binding post,
Wherein, the binding post connects power supply line to be measured；
The output end 3 and output end 4 of the secondary coil respectively with the ac input end of rectifier bridge 1 and ac input end 2
Connection, the rectification cathode output end 3 of the rectifier bridge are connect with the control electrode G of silicon-controlled M, the anode A concatenation of the silicon-controlled M
Be connected after switch S with the anode of power supply, after the cathode K of silicon-controlled M concatenation feedback oscillator and buzzer with the electricity
The cathode in source connects, and the rectification cathode output end 4 of the rectifier bridge is connect with the power cathode.
As an improvement scheme, the feedback oscillator includes triode Q1 and triode Q2, the triode
The grid of Q1 is connect with the cathode K of the silicon-controlled M, and the drain electrode of the triode Q1 is connect with the grid of the triode Q2,
The source electrode of the triode Q1 is connect with the cathode of the power supply, and the drain electrode of the triode Q2 is connect with the buzzer, institute
It states and is equipped with the first current node between the drain electrode of triode Q2 and the buzzer, the route string that first current node is drawn
Connect after connecting resistance R1 and capacitor C1 with the grid of the triode Q1, the silicon-controlled M and cathode K and the triode Q1
Grid between route be equipped with the second current node, the source of route and the triode Q2 that second current node is drawn
Pole connection.
As an improvement scheme, the rectification cathode output end 3 of the rectifier bridge and the control with the silicon-controlled M
Third current node, the 4th current node and the 5th current node are successively arranged on route between pole G processed, the rectifier bridge
The route rectified between cathode output end 4 and the power cathode is equipped with the 6th current node, the 7th current node and the 8th
Current node；
Connection line between the third current node and the 6th current node is equipped with capacitor C2, the 4th electric current
Connection line between node and the 7th current node is equipped with capacitor C3, the 5th current node and the 8th electric current section
Connection line between point is equipped with diode D1.
As an improvement scheme, the low-voltage leakage detection device includes first in several setting electric lines
Low-voltage leakage detection device is used to detect the second low-voltage leakage detection device of transformer leakage state with several；
Several described first low-voltage leakage detection devices are connect by ultrashort wave module with the monitoring center, several
The second low-voltage leakage detection device is connect by 3G wireless router with the monitoring center.
As an improvement scheme, the system also includes the storage hard disks connecting with the monitoring center.
In embodiments of the present invention, low-voltage leakage detection device includes current transformer, and current transformer includes primary line
Circle and secondary coil, the input terminal 1 of primary coil concatenate connection plug after indicator light, and the input terminal 2 of primary coil connects wiring
Column, wherein binding post connects power supply line to be measured；The output end 3 and output end 4 of secondary coil exchanges input with rectifier bridge respectively
End 1 and ac input end 2 connect, and the rectification cathode output end 3 of rectifier bridge is connect with the control electrode G of silicon-controlled M, silicon-controlled M's
Be connected after anode A concatenation switch S with the anode of power supply, the cathode K of silicon-controlled M concatenate after feedback oscillator and buzzer with electricity
The cathode in source connects, and the rectification cathode output end 4 of rectifier bridge connect with power cathode, thus realization to low pressure, leak electricity route into
Row acousto-optic electric alarm reduces security risk.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of low-voltage leakage detection device provided by the invention；
Fig. 2 is the structural schematic diagram of low-voltage leakage detection system provided by the invention；
Wherein, 1- current transformer, 2- indicator light, 3- plug, 4- binding post, 5- power supply, 6- rectifier bridge, the first electric current of 7-
Node, the second current node of 8-, 9- third current node, the 4th current node of 10-, the 5th current node of 11-, the 6th electricity of 12-
Stream node, the 7th current node of 13-, the 8th current node of 14-, 15- monitoring center, 16- the first low-voltage leakage detection device,
17- the second low-voltage leakage detection device, 18-3G wireless router, 19- ultrashort wave module, 20- storage hard disk.
Specific embodiment
Below with reference to specific embodiment, the present invention is further described.But the purposes and mesh of these exemplary embodiments
Be only used to enumerate the present invention, any type of any restriction not is constituted to real protection scope of the invention, it is more non-to incite somebody to action this
The protection scope of invention is confined to this.
Fig. 1 shows the structural schematic diagram of low-voltage leakage detection device provided in an embodiment of the present invention, for ease of description,
Part related to the embodiment of the present invention is only gived in figure.
The low-voltage leakage detection device includes current transformer 1, and the current transformer 1 includes primary coil and secondary wire
Circle, the input terminal 1 of the primary coil concatenate connection plug 3 after indicator light 2, and the input terminal 2 of the primary coil connects wiring
Column 4, wherein the binding post 4 connects 5 line of power supply to be measured；
The output end 3 and output end 4 of the secondary coil respectively with the ac input end 1 of rectifier bridge 6 and ac input end 2
Connection, the rectification cathode output end 3 of the rectifier bridge 6 are connect with the control electrode G of silicon-controlled M, the anode A string of the silicon-controlled M
Be connected after meeting switch S with the anode of power supply 5, after the cathode K of silicon-controlled M concatenation feedback oscillator and buzzer with it is described
The cathode of power supply 5 connects, and the rectification cathode output end 4 of the rectifier bridge 6 is connect with 5 cathode of power supply.
In this embodiment, the feedback oscillator includes triode Q1 and triode Q2, the grid of the triode Q1
Pole is connect with the cathode K of the silicon-controlled M, and the drain electrode of the triode Q1 is connect with the grid of the triode Q2, and described three
The source electrode of pole pipe Q1 is connect with the cathode of the power supply 5, and the drain electrode of the triode Q2 is connect with the buzzer, three pole
The first current node 7 is equipped between the drain electrode of pipe Q2 and the buzzer, the route that first current node 7 is drawn concatenates electricity
Resistance R1 and capacitor C1 after connect with the grid of the triode Q1, the silicon-controlled M and cathode K and the triode Q1 grid
Route between pole is equipped with the second current node 8, the source electrode of route and the triode Q2 that second current node 8 is drawn
Connection.
As shown in connection with fig. 1, the rectification cathode output end 3 of rectifier bridge 6 and described between the control electrode G of the silicon-controlled M
Route on be successively arranged third current node 9, the 4th current node 10 and the 5th current node 11, the rectifier bridge 6 it is whole
It flows the route between cathode output end 4 and 5 cathode of the power supply and is equipped with the 6th current node 12, the 7th current node 13 and the
Eight current nodes 14；
Connection line between the third current node 9 and the 6th current node 12 is equipped with capacitor C2, and the described 4th
Connection line between current node 10 and the 7th current node 13 is equipped with capacitor C3,11 He of the 5th current node
Connection line between 8th current node 14 is equipped with diode D1.
In this embodiment, the trigger current value of the silicon-controlled M is 3mA；The contribution of the current transformer 1 is 2W-
3W, the voltage rating of the indicator light 2 are 220V, power 5W, naturally it is also possible to using the device of other models and power,
This is repeated no more.
In embodiments of the present invention, when the primary coil for thering is leakage current to flow through current transformer 1, secondary coil induction
An alternating voltage is generated, makees detection signal through bridge rectifier, (being tested electric wire has 3mA left when rectifier output voltage is sufficiently large
When right electric leakage), by triggering one-way SCR M conducting, feedback oscillator pushes buzzer to issue " beep " sound, prompts electric wire leakage
Electricity；When leakage current is larger, the indicator light 2 of 5W will be lighted, and warning electric leakage is serious；
A relay can certainly be connect in the line, and relay normally closed contact discharges while alarm, disconnects and using
In power supply 5. will be safer.
In embodiments of the present invention, in addition to warning serious drain, also play a part of to protect alarm.When production, Suo Youyuan
Part can be in a small plastic box, and light bulb, binding post 4 and cell switch are on panel, and two line plugs 3 only connect single line, separately
One empty.
In embodiments of the present invention, it is based on low-voltage leakage detection device shown in FIG. 1, following provide specifically was applied
Journey:
Exposed metal the end of a thread in electric wire one end (two or three) is twisted together, is attempted by binding post 4, entire bundle line is put
Into in the shallow water pool, have can put into line big metal basin can also, other end is hanging, and insulation is placed.Platform upper switch S, two line plugs 3
Line end alignment is the jack insertion of firewire, if at this moment not alarming, illustrates that electric wire is good；If alarm, illustrates have at electric leakage；
Then, the plug 3 into firewire is first pulled up, turns off switch S, stops alarm, then will connect the quilt on binding post 4
The end of a thread being twisted together separates, single to be one by one inserted into the end of a thread, is which root line electric leakage with determination.After finding the electric leakage of certain line, it will leak
Electric wire is divided in half into two bundles, and bundle asks processing drying at mutually remittance, and first a bundle into the water, is placed on insulant for latter a bundle, repeats
Above-mentioned inspection；The paragraph by paragraph examination that " is divided into two " in this way goes down, so that it may find at specific electric leakage.
Fig. 2 shows low-voltage leakage detection system structures provided by the invention only to give in figure for ease of description
Part related to the embodiment of the present invention is gone out.
Low-voltage leakage detection system includes monitoring center 15 and several low pressure for connecting respectively with the monitoring center 15
Earth detector；
Wherein, the structure of low-voltage leakage detection device structure as shown in Figure 1 above can apply Live wires road
Detection and transformer detection field, details are not described herein.
The low-voltage leakage detection device includes the first low-voltage leakage detection device 16 in several setting electric lines
It is used to detect the second low-voltage leakage detection device 17 of transformer leakage state with several；
Several described first low-voltage leakage detection devices 16 are connect by ultrashort wave module 19 with the monitoring center 15,
Several described second low-voltage leakage detection devices 17 are connect by 3G wireless router 18 with the monitoring center 15.
Wherein, the system also includes the storage hard disks 20 connecting with the monitoring center 15.
In embodiments of the present invention, the setting of low-voltage leakage detection device each in electric line, when low pressure and route occurs
Danger signal can be sent when electric leakage from trend inspection center, inspection center locks the position of low pressure, electric leakage, and maintenance personnel can
To rush to low pressure, electric leakage route position in the shortest time, rescue maintenance is carried out, maintenance time has been saved and has improved
Working efficiency.
It in embodiments of the present invention, can route carry out sound, light report to low pressure, electric leakage using low-voltage leakage detection device
It is alert, reduce security risk；Secondly the detection to entire electricity consumption circuit network can be played, once there is the phenomenon that low pressure, electric leakage
It can be sounded an alarm to inspection center rapidly, inspection center makes a response rapidly, improves the detection efficiency of entire power utilization network.
It should be appreciated that the purposes of these embodiments is merely to illustrate the present invention and is not intended to limit protection model of the invention
It encloses.In addition, it should also be understood that, after reading the technical contents of the present invention, those skilled in the art can make the present invention each
Kind change, modification and/or variation, all these equivalent forms equally fall within guarantor defined by the application the appended claims
Within the scope of shield.
Claims (10)
1. a kind of low-voltage leakage detection device, which is characterized in that including current transformer, the current transformer includes primary line
The input terminal 1 of circle and secondary coil, the primary coil concatenates connection plug after indicator light, the input terminal 2 of the primary coil
Connect binding post, wherein the binding post connects power supply line to be measured；
The output end 3 and output end 4 of the secondary coil are connect with the ac input end of rectifier bridge 1 and ac input end 2 respectively,
The rectification cathode output end 3 of the rectifier bridge is connect with the control electrode G of silicon-controlled M, and the anode A of the silicon-controlled M concatenates switch S
It is connected afterwards with the anode of power supply, it is negative with the power supply after the cathode K concatenation feedback oscillator and buzzer of the silicon-controlled M
Pole connection, the rectification cathode output end 4 of the rectifier bridge are connect with the power cathode.
2. low-voltage leakage detection device according to claim 1, which is characterized in that the feedback oscillator includes three poles
Pipe Q1 and triode Q2, the grid of the triode Q1 are connect with the cathode K of the silicon-controlled M, the drain electrode of the triode Q1
It is connect with the grid of the triode Q2, the source electrode of the triode Q1 is connect with the cathode of the power supply, the triode Q2
Drain electrode connect with the buzzer, between the drain electrode and the buzzer of the triode Q2 be equipped with the first current node, institute
It is connect after stating the route series resistor R1 and capacitor C1 of the first current node extraction with the grid of the triode Q1, it is described controllable
Silicon M and cathode K and the triode Q1 grid between route be equipped with the second current node, second current node draws
Route out is connect with the source electrode of the triode Q2.
3. low-voltage leakage detection device according to claim 2, which is characterized in that the rectification anode of the rectifier bridge exports
Third current node, the 4th current node are successively arranged on end 3 and the route between the control electrode G of the silicon-controlled M
With the 5th current node, the route between the rectification cathode output end 4 of the rectifier bridge and the power cathode is equipped with the 6th
Current node, the 7th current node and the 8th current node；
Connection line between the third current node and the 6th current node is equipped with capacitor C2, the 4th current node
Connection line between the 7th current node is equipped with capacitor C3, the 5th current node and the 8th current node it
Between connection line be equipped with diode D1.
4. low-voltage leakage detection device according to claim 3, which is characterized in that the trigger current value of the silicon-controlled M
For 3mA.
5. low-voltage leakage detection device according to claim 1, which is characterized in that the contribution of the current transformer is
2W-3W, the voltage rating of the indicator light are 220V, power 5W.
6. a kind of low-voltage leakage detection system, which is characterized in that connect including monitoring center and respectively with the monitoring center
Several low-voltage leakage detection devices；
The low-voltage leakage detection device includes current transformer, and the current transformer includes primary coil and secondary coil,
The input terminal 1 of the primary coil concatenates connection plug after indicator light, and the input terminal 2 of the primary coil connects binding post,
In, the binding post connects power supply line to be measured；
The output end 3 and output end 4 of the secondary coil are connect with the ac input end of rectifier bridge 1 and ac input end 2 respectively,
The rectification cathode output end 3 of the rectifier bridge is connect with the control electrode G of silicon-controlled M, and the anode A of the silicon-controlled M concatenates switch S
It is connected afterwards with the anode of power supply, it is negative with the power supply after the cathode K concatenation feedback oscillator and buzzer of the silicon-controlled M
Pole connection, the rectification cathode output end 4 of the rectifier bridge are connect with the power cathode.
7. low-voltage leakage detection system according to claim 6, which is characterized in that the feedback oscillator includes three poles
Pipe Q1 and triode Q2, the grid of the triode Q1 are connect with the cathode K of the silicon-controlled M, the drain electrode of the triode Q1
It is connect with the grid of the triode Q2, the source electrode of the triode Q1 is connect with the cathode of the power supply, the triode Q2
Drain electrode connect with the buzzer, between the drain electrode and the buzzer of the triode Q2 be equipped with the first current node, institute
It is connect after stating the route series resistor R1 and capacitor C1 of the first current node extraction with the grid of the triode Q1, it is described controllable
Silicon M and cathode K and the triode Q1 grid between route be equipped with the second current node, second current node draws
Route out is connect with the source electrode of the triode Q2.
8. low-voltage leakage detection system according to claim 7, which is characterized in that the rectification anode of the rectifier bridge exports
Third current node, the 4th current node are successively arranged on end 3 and the route between the control electrode G of the silicon-controlled M
With the 5th current node, the route between the rectification cathode output end 4 of the rectifier bridge and the power cathode is equipped with the 6th
Current node, the 7th current node and the 8th current node；
Connection line between the third current node and the 6th current node is equipped with capacitor C2, the 4th current node
Connection line between the 7th current node is equipped with capacitor C3, the 5th current node and the 8th current node it
Between connection line be equipped with diode D1.
9. low-voltage leakage detection system according to claim 6, which is characterized in that the low-voltage leakage detection device includes
The first low-voltage leakage detection device in several setting electric lines and several be used to detect the of transformer leakage state
Two low-voltage leakage detection devices；
Several described first low-voltage leakage detection devices are connect by ultrashort wave module with the monitoring center, described in several
Second low-voltage leakage detection device is connect by 3G wireless router with the monitoring center.
10. low-voltage leakage detection system according to claim 9, which is characterized in that the system also includes with the prison
The storage hard disk of control center connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811281845.7A CN109116176A (en) | 2018-10-31 | 2018-10-31 | A kind of low-voltage leakage detection device and low-voltage leakage detection system |
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| CN201811281845.7A CN109116176A (en) | 2018-10-31 | 2018-10-31 | A kind of low-voltage leakage detection device and low-voltage leakage detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920742A (en) * | 2019-02-13 | 2019-06-21 | 长江存储科技有限责任公司 | A kind of semiconductor device failure detection method |
| CN110992795A (en) * | 2019-12-26 | 2020-04-10 | 广东电网有限责任公司 | Multifunctional live working training system |
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| CN87211485U (en) * | 1987-09-09 | 1988-04-20 | 穆方新 | Electricity-leakage alarm with sound and light effects |
| CN2183571Y (en) * | 1993-10-07 | 1994-11-23 | 卢娣娣 | Electricity-leakage alarm for domestic electric appliance |
| CN1267048A (en) * | 1999-03-16 | 2000-09-20 | 胜利油田石校科技开发中心 | Electric leakage alarm device for workshops in oil well field |
| CN1747271A (en) * | 2005-08-26 | 2006-03-15 | 李明 | Protector of leakage and electricity steal |
| CN206248712U (en) * | 2016-10-12 | 2017-06-13 | 国家电网公司 | A kind of long-range electric leakage alarm device for ammeter box |
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2018
- 2018-10-31 CN CN201811281845.7A patent/CN109116176A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87211485U (en) * | 1987-09-09 | 1988-04-20 | 穆方新 | Electricity-leakage alarm with sound and light effects |
| CN2183571Y (en) * | 1993-10-07 | 1994-11-23 | 卢娣娣 | Electricity-leakage alarm for domestic electric appliance |
| CN1267048A (en) * | 1999-03-16 | 2000-09-20 | 胜利油田石校科技开发中心 | Electric leakage alarm device for workshops in oil well field |
| CN1747271A (en) * | 2005-08-26 | 2006-03-15 | 李明 | Protector of leakage and electricity steal |
| CN206248712U (en) * | 2016-10-12 | 2017-06-13 | 国家电网公司 | A kind of long-range electric leakage alarm device for ammeter box |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920742A (en) * | 2019-02-13 | 2019-06-21 | 长江存储科技有限责任公司 | A kind of semiconductor device failure detection method |
| CN110992795A (en) * | 2019-12-26 | 2020-04-10 | 广东电网有限责任公司 | Multifunctional live working training system |
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Application publication date: 20190101 |