CN208969184U - A kind of electric-leakage detection circuit, device and distribution box - Google Patents
A kind of electric-leakage detection circuit, device and distribution box Download PDFInfo
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- CN208969184U CN208969184U CN201821482044.2U CN201821482044U CN208969184U CN 208969184 U CN208969184 U CN 208969184U CN 201821482044 U CN201821482044 U CN 201821482044U CN 208969184 U CN208969184 U CN 208969184U
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Abstract
The utility model discloses a kind of electric-leakage detection circuits, device and distribution box, wherein, the electric-leakage detection circuit is connect with warning circuit, first test side of the electric-leakage detection circuit and the ground wire of test line connect, second test side of the electric-leakage detection circuit and the zero curve of test line connect, the electric-leakage detection circuit includes rectification filtering module and isolation conversion module, the rectification filtering module and first test side, second test side is connected with isolation conversion module, for detecting the alternating voltage between first test side and the second test side and carrying out after rectifying and wave-filtering processing output DC voltage to it to conversion module is isolated, the isolation conversion module is also connect with warning circuit, for exporting corresponding level signal to warning circuit according to the size of the DC voltage, the warning circuit is controlled by survey line Road is opened when leaking electricity, casualties and property loss caused by effectively preventing and avoiding because of ground wire electrification.
Description
Technical field
The utility model relates to electricity consumption detection technique field, in particular to a kind of electric-leakage detection circuit, device and distribution box.
Background technique
The mains-supplied route used in the fields such as house, office, usually used power supply line be firewire (L or L1,
L2, L3), zero curve (N), ground wire (G), in order to prevent firewire caused by a variety of causes electric leakage cause personnel get an electric shock injury, it will usually
Earth leakage protective device is housed in inlet wire distribution box, realizes that power-off is protected by the current differential between detection firewire (L) and zero curve (N)
Protective function powers off rapidly, when electric leakage, personnel's electric shock occur for route with protection staff and property safety.
However, being likely to occur in addition to firewire drain conditions there are also a kind of drain conditions, i.e., ground wire open circuit leaks electricity, normal
In the case of, the ground wire of power supply must be uniformly connected on the ground line of building, and ground line is essentially that open a way, and less should
Electrification, but practical electricity consumption situation and route are multifarious, wiring is unreliable or even mistake inevitably occurs or it is subsequent artificially
Change mistake can not avoid completely, ground wire open circuit or not have the case where reliable ground that may can occur, when ground wire occur open circuit and
When electrification, the ground wire for sharing all electrical appliances (electric appliance with ground line) of this ground wire at this time will have high voltage, and
Electrical appliance can also continue to work normally, since existing earth leakage protective device can not detect such case, can to
The personal safety as well as the property safety at family brings threat.
Thus the prior art could be improved and improve.
Utility model content
In view of above-mentioned deficiencies of the prior art place, the purpose of this utility model is to provide a kind of electric-leakage detection circuit,
Device and distribution box can leak electricity to ground wire open circuit and detect, and alarm electricity is controlled when open circuit drain conditions occur detecting
Road is opened, and exports warning message in time, casualties and property loss caused by effectively preventing and avoiding because of ground wire electrification.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of electric-leakage detection circuit, connect with warning circuit, the first test side of the electric-leakage detection circuit and tested
The ground wire of route connects, and the second test side of the electric-leakage detection circuit and the zero curve of test line connect, the detection of electrical leakage
Circuit includes rectification filtering module and isolation conversion module, and the rectification filtering module is detected with first test side, second
End with isolation conversion module connect, for detect the alternating voltage between first test side and the second test side and to its into
Output DC voltage is also connect with warning circuit to conversion module, the isolation conversion module is isolated after the processing of row rectifying and wave-filtering,
For exporting corresponding level signal to warning circuit according to the size of the DC voltage, the warning circuit is controlled tested
It is opened when line electrical leakage.
In the electric-leakage detection circuit, the isolation conversion module is specifically used for being less than default electricity when the DC voltage
High level signal is exported when pressure to warning circuit, exports low level signal extremely when the DC voltage is more than or equal to predeterminated voltage
Warning circuit.
It further include the current limliting module of the dash current generated when being powered for reducing, institute in the electric-leakage detection circuit
Current limliting module is stated to connect with the 1st end of first test side and the rectification filtering module.
It further include the Voltage stabilizing module for carrying out steady pressure treatment to the DC voltage in the electric-leakage detection circuit,
The Voltage stabilizing module connects the 1st end and the 2nd end at the 2nd end of the rectification filtering module, the isolation conversion module.
In the electric-leakage detection circuit, the rectification filtering module includes first diode, the second diode, the three or two
Pole pipe, the 4th diode and capacitor；The anode of the first diode and the anode of the third diode connect with reference to ground, described
The cathode of first diode connects positive and first test side of second diode；The cathode of second diode
Connect the 1st end of the cathode of the 4th diode, one end of the capacitor and the isolation conversion module；Three or two pole
The cathode of pipe connects positive and second test side of the 4th diode；Another termination of the capacitor is with reference to ground.
In the electric-leakage detection circuit, the isolation conversion module includes photoelectrical coupler, the photoelectrical coupler
1st foot connects the 2nd end of the rectification filtering module, and the 2nd foot of the photoelectrical coupler connects with reference to ground；The photoelectrical coupler
The 3rd foot ground connection；4th foot of the photoelectrical coupler connects warning circuit.
In the electric-leakage detection circuit, the current limliting module includes first resistor, one end connection of the first resistor
First test side, the other end of the first resistor connect the 1st end of the rectification filtering module.
In the electric-leakage detection circuit, the Voltage stabilizing module includes zener diode and second resistance, the pressure stabilizing two
The cathode of pole pipe connects the 2nd end of the rectification filtering module, and the anode of the zener diode connects the second resistance
1st end of one end and the isolation conversion module；The other end of the second resistance connects the 2nd end of the isolation conversion module
With reference.
A kind of earth detector, including shell are provided with pcb board in the shell, are provided on the pcb board as above
The electric-leakage detection circuit.
A kind of distribution box comprising earth detector as described above.
Compared to the prior art, in electric-leakage detection circuit provided by the utility model, device and distribution box, the electric leakage inspection
Slowdown monitoring circuit is connect with warning circuit, and the first test side of the electric-leakage detection circuit and the ground wire of test line connect, the leakage
The zero curve of second test side of power detection circuit and test line connects, the electric-leakage detection circuit include rectification filtering module and
It is isolated conversion module, the rectification filtering module and first test side, the second test side and conversion module be isolated connects, use
It is exported directly in the alternating voltage detected between first test side and the second test side and after carrying out rectifying and wave-filtering processing to it
Galvanic electricity is depressed into isolation conversion module, and the isolation conversion module is also connect with warning circuit, for according to the DC voltage
Size exports corresponding level signal to warning circuit, controls warning circuit unlatching in test line electric leakage.It can be over the ground
Line open circuit electric leakage is detected, and is detecting that control warning circuit is opened when open circuit drain conditions occur, output alarm in time
Information, casualties and property loss caused by effectively preventing and avoiding because of ground wire electrification.
Detailed description of the invention
Fig. 1 is the structural block diagram of electric-leakage detection circuit provided by the utility model.
Fig. 2 is the circuit diagram of electric-leakage detection circuit provided by the utility model.
Specific embodiment
The utility model provides a kind of electric-leakage detection circuit, device and distribution box, can leak electricity and detect to ground wire open circuit,
And detecting that control warning circuit is opened when open circuit drain conditions occur, and is exported warning message in time, is effectively prevented and avoid
Because of casualties and property loss caused by ground wire electrification.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
Referring to Fig. 1, electric-leakage detection circuit 10 provided by the utility model is connect with warning circuit 20, the detection of electrical leakage
The ground wire of first test side G of circuit 10 and test line connects, the second test side N of the electric-leakage detection circuit 10 and tested
The zero curve of route connects, and the electric-leakage detection circuit 10 includes rectification filtering module 101 and conversion module 102 is isolated, wherein institute
It states rectification filtering module 101 and the first test side G, the second test side N and conversion module 102 is isolated and connect, the isolation
Conversion module 102 is also connect with warning circuit 20, and the rectification filtering module 101 is for detecting the first test side G and the
Alternating voltage between two test side N simultaneously carries out after rectifying and wave-filtering processing output DC voltage to isolation conversion module 102 to it,
The isolation conversion module 102 is used for according to the corresponding level signal of the size of DC voltage output to warning circuit 20,
The warning circuit 20 unlatching in test line electric leakage is controlled, should be noted, the warning circuit 20 is the prior art, energy
Realize alarm signal output, the utility model is not described further its circuit structure.
Since under normal circumstances, the ground of test line is 0, zero curve current potential is 0 or near 0, therefore works as line
When road works normally, almost without potential difference between the ground wire and zero curve of test line, and when ground wire open circuit and electrification, such as
Firewire has snapped on ground wire or the electrical appliance that connect with test line is there is a situation where electric leakage to ground wire, at this time ground wire and zero
Potential difference will be present between line, therefore, examine the first test side G and second in electric-leakage detection circuit 10 provided by the utility model
It surveys end N to connect with ground wire and zero curve respectively, the first test side G and the second test side N is detected by the rectification filtering module 101
Between alternating voltage, i.e., detection ground wire and zero curve between alternating voltage, and to the alternating voltage carry out rectifying and wave-filtering after it is defeated
Reliable and stable DC voltage is to isolation conversion module 102 out, by the isolation conversion module 102 according to direct current currently entered
The size of voltage is to determine whether occurring ground wire drain conditions and exporting corresponding level signal to warning circuit 20, so that described
Warning circuit 20 is opened when ground wire open circuit and drain conditions occur for test line, exports warning message to prompt user to examine in time
Leak current fault, casualties and property loss caused by effectively preventing and avoiding because of ground wire electrification are checked in line inspection road.
In the present embodiment, the isolation conversion module 102 is specifically used for defeated when the DC voltage is less than predeterminated voltage
High level signal is to warning circuit 20 out, and when the DC voltage is more than or equal to predeterminated voltage, output low level signal is extremely alarmed
Circuit 20.The i.e. described warning circuit 20 is triggered using low level, when the DC voltage is less than predeterminated voltage, is illustrated at this time
Very small negligible without potential difference or potential difference between line and zero curve, there is no drain conditions for ground wire, therefore export
High level signal controls warning circuit 20 and is failure to actuate to warning circuit 20；And when DC voltage is more than or equal to predeterminated voltage, it says
It is bright to have high potential poor between ground wire and zero curve at this time, ground wire open circuit and electrification, therefore low level signal is exported to electricity of alarming
Road 20, triggering warning circuit 20 are opened, and warning message is exported, and are worked as to realize according to the voltage swing difference judgement detected
The electrification situation of preceding ground wire, and control warning circuit 20 in ground wire electrification and export warning message realization warning function, exist certainly
High level triggering can also be used in warning circuit 20 described in other embodiments, then the isolation conversion module 102 is in DC voltage
Low level signal is exported when less than predeterminated voltage and exports high level signal when DC voltage is more than or equal to predeterminated voltage, equally may be used
To realize detection and the warning function of ground wire electrification, it effectively prevent the shock episodes as caused by ground wire electrification.
Further, please continue to refer to Fig. 1, electric-leakage detection circuit 10 provided by the utility model further includes current limliting module
103, the current limliting module 103 is connect with the 1st end of the first test side G and the rectification filtering module 101, the current limliting
Module 103 is used to reduce the dash current generated when being powered, and due to closing a floodgate in supply network, moment, there may be instantaneous impacts
Electric current influences the normal work of the electrical equipment in supply network, therefore energization can be effectively suppressed by the current limliting module 103
When dash current to protect circuit to work normally, improve electric-leakage detection circuit 10 functional reliability.
Further, the electric-leakage detection circuit 10 further includes Voltage stabilizing module 104, the Voltage stabilizing module 104 for pair
The DC voltage carries out steady pressure treatment, i.e., after the rectified filtering of the voltage between ground wire and zero curve, by Voltage stabilizing module 104 into
Steady pressure treatment is carried out to one step to it, so that input stablizes glitch-free DC voltage to isolation conversion module 102, is prevented
The case where error detection, improves the Stability and veracity of electric-leakage detection circuit 10.
When it is implemented, referring to Fig. 2, in electric-leakage detection circuit provided by the utility model 10, the rectifying and wave-filtering mould
Block 101 includes first diode D1, the second diode D2, third diode D3, the 4th diode D4 and capacitor C1；Described first
The anode of diode D1 and the anode of the third diode D3 connect with reference to ground, and the cathode of the first diode D1 is rectification filter
1st end of wave module 101 connects the anode and the first test side G of the second diode D2；The second diode D2
Cathode be rectification filtering module 101 the 2nd end, connect the cathode of the 4th diode D4, one end of the capacitor C1 and
1st end of the isolation conversion module 102；The cathode of the third diode D3 connect the 4th diode D4 anode and
The second test side N；Another termination of the capacitor C1 is with reference to ground.Pass through first diode D1, the second diode D2, the
The alternating voltage that three diode D3 and the 4th diode D4 constitute rectifying full bridge and will test is converted to DC voltage, passes through later
Capacitor C1 is filtered to be interfered with filtering clutter, it is ensured that the stability of voltage detecting result.
Further, the isolation conversion module 102 include photoelectrical coupler PC1, the 1st of the photoelectrical coupler PC1 the
Foot is the 1st end that conversion module 102 is isolated, and connects the 2nd end of the rectification filtering module 101, that is, connects the described 2nd 2
The cathode of pole pipe D2, the 2nd foot of the photoelectrical coupler PC1 are the 2nd end that conversion module 102 is isolated, and connection is with reference to ground；Institute
State the 3rd foot ground connection of photoelectrical coupler PC1；The 4th foot of the photoelectrical coupler PC1 connects warning circuit 20, specific connection report
The control terminal of alert circuit 20 realizes isolation conversion by photoelectrical coupler PC1, and when ground wire is not charged, DC voltage is less than pre-
If voltage, it is approximately equal to 0, the 1st foot of the photoelectrical coupler PC1 and the 2nd foot are 0 at this time, and the high level of the 4th foot output at this time is extremely
Warning circuit 20, and when ground wire electrification, DC voltage is not 0, and DC high voltage is added to the photoelectrical coupler PC1's at this time
On 1st foot, so that being connected between the 4th foot of photoelectrical coupler PC1 and the 3rd foot, the 4th foot exports low level to warning circuit at this time
20, control warning circuit 20 is opened, and exports warning message.
Further, the current limliting module 103 include first resistor R1, the first resistor R1 one end connection described in
First test side G, the other end of the first resistor R1 connect the 1st end of the rectification filtering module 101, i.e., described first electricity
The other end of resistance R1 connects the cathode of the first diode D1, and impact when energization is effectively reduced by the first resistor R1
Electric current, effective protection circuit work normally, and avoid damage circuit element.
Further, the Voltage stabilizing module 104 includes zener diode ZD1 and second resistance R2, two pole of pressure stabilizing
The cathode of pipe ZD1 connects the 2nd end of the rectification filtering module 101, i.e., the cathode connection of the described zener diode ZD1 described the
The cathode of two diode D2, the anode of the zener diode ZD1 connects one end of the second resistance R2 and the isolation turns
Change the mold the 1st end (i.e. the 1st foot of photoelectrical coupler PC1) of block 102；The other end connection isolation of the second resistance R2 turns
Change the mold the 2nd end (i.e. the 2nd foot of photoelectrical coupler PC1) of block 102 and with reference to ground.Pass through the zener diode ZD1 and second
Resistance R2 carries out steady pressure treatment, avoids that voltage jump or interference phenomenon occurs, effectively inhibits interference, prevent due to voltage jump
Or electric-leakage detection circuit 10 caused by interfering malfunctions, and improves the accuracy that electric-leakage detection circuit 10 detects.
Based on above-mentioned electric-leakage detection circuit, the utility model correspondingly provides a kind of earth detector comprising shell,
It is provided with pcb board in the shell, electric-leakage detection circuit as described above is provided on the pcb board, by above to institute
It states electric-leakage detection circuit to be described in detail, details are not described herein again.
Based on above-mentioned earth detector, the utility model correspondingly provides a kind of distribution box comprising the upper leakage
Electric detection means, since the electric-leakage detection circuit being described in detail above, details are not described herein again.
In conclusion in electric-leakage detection circuit provided by the utility model, device and distribution box, the electric-leakage detection circuit
It is connect with warning circuit, the first test side of the electric-leakage detection circuit and the ground wire of test line connect, the detection of electrical leakage
Second test side of circuit and the zero curve of test line connect, and the electric-leakage detection circuit includes that rectification filtering module and isolation turn
It changes the mold block, the rectification filtering module and first test side, the second test side and conversion module is isolated connects, for detecting
Alternating voltage between first test side and the second test side simultaneously exports DC voltage after carrying out rectifying and wave-filtering processing to it
To isolation conversion module, the isolation conversion module is also connect with warning circuit, defeated for the size according to the DC voltage
Corresponding level signal controls warning circuit unlatching in test line electric leakage to warning circuit out.It can be to ground wire open circuit
Electric leakage is detected, and is detecting that control warning circuit is opened when open circuit drain conditions occur, and exports warning message in time, has
Casualties and property loss caused by effect is prevented and avoided because of ground wire electrification.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (10)
1. a kind of electric-leakage detection circuit, connect with warning circuit, which is characterized in that the first detection of the electric-leakage detection circuit
End is connect with the ground wire of test line, and the second test side of the electric-leakage detection circuit and the zero curve of test line connect, described
Electric-leakage detection circuit includes rectification filtering module and isolation conversion module, the rectification filtering module and first test side,
Second test side is connected with isolation conversion module, for detecting the alternating voltage between first test side and the second test side
And for output DC voltage to conversion module is isolated, the isolation conversion module is also electric with alarm after carrying out rectifying and wave-filtering processing to it
Road connection controls the alarm electricity for exporting corresponding level signal to warning circuit according to the size of the DC voltage
It is opened when test line leaks electricity on road.
2. electric-leakage detection circuit according to claim 1, which is characterized in that the isolation conversion module is specifically used for working as institute
Output high level signal is to warning circuit when stating DC voltage less than predeterminated voltage, when the DC voltage is more than or equal to default electricity
Low level signal is exported when pressure to warning circuit.
3. electric-leakage detection circuit according to claim 1, which is characterized in that further include for reduce be powered when generate rush
The current limliting module of electric current is hit, the current limliting module is connect with the 1st end of first test side and the rectification filtering module.
4. electric-leakage detection circuit according to claim 3, which is characterized in that further include for being carried out to the DC voltage
The Voltage stabilizing module of steady pressure treatment, the Voltage stabilizing module connect the 2nd end of the rectification filtering module, the isolation conversion module
1st end and the 2nd end.
5. electric-leakage detection circuit according to claim 1, which is characterized in that the rectification filtering module includes the one or two pole
Pipe, the second diode, third diode, the 4th diode and capacitor；The anode of the first diode and the three or two pole
The anode of pipe connects with reference to ground, and the cathode of the first diode connects the anode of second diode and described first and detects
End；The cathode of second diode connects the cathode of the 4th diode, one end of the capacitor and isolation conversion
1st end of module；The cathode of the third diode connects positive and second test side of the 4th diode；It is described
Another termination of capacitor is with reference to ground.
6. electric-leakage detection circuit according to claim 1, which is characterized in that the isolation conversion module includes photoelectric coupling
Device, the 1st foot of the photoelectrical coupler connect the 2nd end of the rectification filtering module, and the 2nd foot of the photoelectrical coupler connects ginseng
Examine ground；3rd foot of the photoelectrical coupler is grounded；4th foot of the photoelectrical coupler connects warning circuit.
7. electric-leakage detection circuit according to claim 3, which is characterized in that the current limliting module includes first resistor, institute
The one end for stating first resistor connects first test side, and the other end of the first resistor connects the rectification filtering module
1st end.
8. electric-leakage detection circuit according to claim 4, which is characterized in that the Voltage stabilizing module include zener diode and
Second resistance, the cathode of the zener diode connect the 2nd end of the rectification filtering module, the anode of the zener diode
Connect one end of the second resistance and the 1st end of the isolation conversion module；Described in the other end connection of the second resistance
The 2nd end of conversion module is isolated and with reference to ground.
9. a kind of earth detector, including shell, pcb board is provided in the shell, which is characterized in that on the pcb board
It is arranged just like electric-leakage detection circuit described in claim 1-8 any one.
10. a kind of distribution box, which is characterized in that including earth detector as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821482044.2U CN208969184U (en) | 2018-09-11 | 2018-09-11 | A kind of electric-leakage detection circuit, device and distribution box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821482044.2U CN208969184U (en) | 2018-09-11 | 2018-09-11 | A kind of electric-leakage detection circuit, device and distribution box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208969184U true CN208969184U (en) | 2019-06-11 |
Family
ID=66754843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821482044.2U Expired - Fee Related CN208969184U (en) | 2018-09-11 | 2018-09-11 | A kind of electric-leakage detection circuit, device and distribution box |
Country Status (1)
| Country | Link |
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| CN (1) | CN208969184U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231536A (en) * | 2019-07-25 | 2019-09-13 | 云南电网有限责任公司电力科学研究院 | A kind of grid power leakage monitoring device and method |
| CN110297156A (en) * | 2019-08-15 | 2019-10-01 | 山东凌宝智能科技有限公司 | A kind of circuit and method by electrical leakage voltage detection electric leakage |
| CN112462296A (en) * | 2020-11-05 | 2021-03-09 | 广东电网有限责任公司阳江供电局 | Be applied to electrified alarm device at power consumption monitor terminal |
| CN112902457A (en) * | 2019-11-19 | 2021-06-04 | 青岛海尔智能技术研发有限公司 | Electric leakage prompting method and device for electric water heater and electric water heater |
| WO2021237977A1 (en) * | 2020-05-26 | 2021-12-02 | 捍防（苏州）实业有限公司 | Apparatus and method for monitoring resistance between null line and ground line |
| CN113884836A (en) * | 2021-10-29 | 2022-01-04 | 国网河南省电力公司检修公司 | Cable secondary line calibration instrument |
| CN114184857A (en) * | 2021-11-12 | 2022-03-15 | 国网山东省电力公司潍坊市寒亭区供电公司 | Low-voltage distribution network full-type line leakage current detection device and method |
-
2018
- 2018-09-11 CN CN201821482044.2U patent/CN208969184U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231536A (en) * | 2019-07-25 | 2019-09-13 | 云南电网有限责任公司电力科学研究院 | A kind of grid power leakage monitoring device and method |
| CN110231536B (en) * | 2019-07-25 | 2021-07-20 | 云南电网有限责任公司电力科学研究院 | Power grid leakage monitoring device and method |
| CN110297156A (en) * | 2019-08-15 | 2019-10-01 | 山东凌宝智能科技有限公司 | A kind of circuit and method by electrical leakage voltage detection electric leakage |
| CN110297156B (en) * | 2019-08-15 | 2024-04-05 | 山东凌宝智能科技有限公司 | Circuit and method for detecting electric leakage through electric leakage voltage |
| CN112902457A (en) * | 2019-11-19 | 2021-06-04 | 青岛海尔智能技术研发有限公司 | Electric leakage prompting method and device for electric water heater and electric water heater |
| CN112902457B (en) * | 2019-11-19 | 2024-05-17 | 青岛海尔智能技术研发有限公司 | Electric leakage prompting method and device for electric water heater and electric water heater |
| WO2021237977A1 (en) * | 2020-05-26 | 2021-12-02 | 捍防（苏州）实业有限公司 | Apparatus and method for monitoring resistance between null line and ground line |
| CN112462296A (en) * | 2020-11-05 | 2021-03-09 | 广东电网有限责任公司阳江供电局 | Be applied to electrified alarm device at power consumption monitor terminal |
| CN113884836A (en) * | 2021-10-29 | 2022-01-04 | 国网河南省电力公司检修公司 | Cable secondary line calibration instrument |
| CN113884836B (en) * | 2021-10-29 | 2024-07-05 | 国网河南省电力公司超高压公司 | Cable secondary line calibrator |
| CN114184857A (en) * | 2021-11-12 | 2022-03-15 | 国网山东省电力公司潍坊市寒亭区供电公司 | Low-voltage distribution network full-type line leakage current detection device and method |
| CN114184857B (en) * | 2021-11-12 | 2024-02-23 | 国网山东省电力公司潍坊市寒亭区供电公司 | Low-voltage distribution network full-class circuit leakage current detection device and method |
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