CN201673233U - Distribution network line fault judger - Google Patents
Distribution network line fault judger Download PDFInfo
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- CN201673233U CN201673233U CN2010202050888U CN201020205088U CN201673233U CN 201673233 U CN201673233 U CN 201673233U CN 2010202050888 U CN2010202050888 U CN 2010202050888U CN 201020205088 U CN201020205088 U CN 201020205088U CN 201673233 U CN201673233 U CN 201673233U
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Abstract
The utility model discloses a distribution network line fault judger, which comprises three front end detecting devices and a wireless data transmission device for analyzing and processing signals detected by the three front end detecting devices and synchronously uploading analyzed line fault results to a background monitor host. The three front end detecting devices are respectively mounted on an A-phase power supply and distribution line, a B-phase power supply and distribution line and a C-phase power supply and distribution line in a monitored high-voltage distribution line in an equipotential form, and the wireless data transmission device, the three front end detecting devices and the background monitor host are in double-way wireless communication. The distribution network line fault judger is reasonable in structural design, low in investment cost and high in fault testing accuracy and practical value, and effectively solves relevant problems of accurate detection of single-phase earth fault and phase short circuit fault, fast transmission of detected data, work power sources of equipment and the like in distribution network lines.
Description
Technical field
The utility model belongs to distribution line failure judgment technology field, especially relates to a kind of distribution line fault judgement device.
Background technology
According to the target that State Grid Corporation of China proposes, China will realize the construction of intelligent electrical network substantially at the year two thousand twenty, and the intelligent power distribution net important link that is one of them.Domestic distribution network automated construction at present relatively lags behind, after state net company carried out the power distribution automation pilot in 2010, city power distribution automation construction and upgrading that will unfolded nationwide, the transformation of rural power grids simultaneously also spreads out in the whole nation, to the improving and improve and driven the bigger market opportunity of the automaticity of low-voltage rack, will become the breakthrough of Future Power System enterprise development.Power distribution network is contacted directly the user, and its reliable power supply capacity and power supply quality are the direct embodiment of electric power enterprise economic benefit, corresponding again immeasurable social benefit.Distribution system is complicated because branch line is many, generally only outlet breaker tripping operation when being short-circuited fault, even on backbone, use switch-segment, also can only isolate limited several sections, concrete abort situation be found out and often a large amount of human and material resources and time need be expended.Nowadays, though troubleshooting is studied morely in China, have various shaped articles to provide yet, all need artificial scene to search basically, automatization level is not high.
The accurate fault-location problem of power distribution network is the difficult problem that electric power research worker long-term endeavour solves, and existing localization method can be summarized as three kinds: first kind is to be the fault localization method of purpose to measure fault distance at line scan pickup coil side point place; Second kind is that fault the back takes place by inject the signal injection method that signal specific realizes tracking to system; The third is an outdoor failure point detecting method of determining fault section according to the difference of failure message before and after the trouble spot.The domestic fault detector technology of introducing in the nineties in last century, be divided into earth-fault indicator and short trouble indicator, developed into ground connection and short circuit " two and one " fault detector afterwards, the indicator board turning shows when fault takes place, but still the personnel of need search fault to on-the-spot line walking, and failure problems is failed to report in existence in a large number, in recent years, along with the development of digital processing technology, novel sensing technology, intelligent fault detector arises at the historic moment, and has improved the accuracy of fault judgement.
Relevant feeder line monitoring, protection and fault diagnosis are very important ingredients in electrical power distribution automatization system.At present, the end product that is installed on the feeder line mainly contains two types: 1, combine with feeder switch and protect, measure, be controlled in the FTU device of one; 2, directly be installed on fault detector on the circuit.These two kinds of products are respectively having relative merits aspect its functional performance: for the FTU device; link to each other with on-load switch or isolating switch on the general fixing online bar during actual installation; thereby need power failure to install; has protection during actual the use; measure; control; functions such as early warning; and accuracy class height; fault judgement accuracy rate height; usually adopt optical fiber; carrier wave; wireless; mobile public network (GSM; communication modes such as GPRS); but investment cost and need deploy switch; to sum up; described FTU apparatus function is strong; performance is good, but cooperates the isolating switch isolated fault, can not install in a large number but influenced on the line by investment cost and mounting means.For fault detector, can directly be installed on the circuit during actual installation,, can chargedly install with the circuit equipotential, thereby cost of investment is low, but it is on the low side to detect short trouble fault and judging nicety rate, and no communication channel can only rely on the board turning indication fault simultaneously, to sum up, described fault detector function singleness, low precision, but the product cost is low, installation simply need not to have a power failure, and can use in a large number on the line.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of distribution line fault judgement device is provided, its reasonable in design, cost of investment are low, fault test precision height and practical value height, efficiently solve the singlephase earth fault that exists in the power distribution network circuit and the accurate detection of phase fault, the quick transmission that detects data, the relevant issues such as working power of equipment.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of distribution line fault judgement device, it is characterized in that: comprise three front-end detection devices and three front-end detection device institute detection signals are carried out analyzing and processing and the line fault result who analyzes are uploaded to synchronously the wireless data sending device of background monitoring main frame, three front-end detection devices equipotential respectively are installed in ABC three-phase in the monitored high-tension distributing line on the distribution wire, all carry out two-way communication with communication between described wireless data sending device and three front-end detection devices and the background monitoring main frame.
The different-frequency measure unit that described front-end detection device comprises load measurement unit that the load current to monitored high-tension distributing line detects in real time, detect in real time to the single-phase earthing state of monitored high-tension distributing line, according to the load measurement unit and different-frequency measure unit institute detection signal is diagnosed the line fault state and with the fault diagnosis report synchronized transmission to the primary processor one of wireless data sending device and the wireless communication module one that joins with primary processor one, described load measurement unit and different-frequency measure unit all connect primary processor one.
Described front-end detection device also comprises overcurrent protection startup module and the fast tripping protection startup module that judges whether correspondingly to carry out overcurrent protection and fast tripping protection according to load measurement unit institute detection signal; described load measurement unit all starts module with overcurrent protection and fast tripping protection startup module is joined, and described overcurrent protection starts module and fast tripping protection startup module is all joined with primary processor two.
Described wireless data sending device comprises the wireless communication module two that is used with wireless communication module one, be uploaded to the primary processor two of background monitoring main frame and the supply module that joins with primary processor two synchronously after transmission information of wireless communication module is packed, and described wireless communication module one joins with primary processor two.
Described supply module comprises transformer and the power module that joins with the second siding ring output terminal of transformer, transformer with get can electric capacity join and get can electric capacity and monitored high-tension distributing line join; A terminals ground connection of described transformer first siding ring and its another terminals can join with monitored high-tension distributing line behind the electric capacity through getting, and described power module and primary processor two join.
Described wireless data sending device also comprises the voltage monitoring module that the voltage-to-ground of transformer first siding ring is detected and realizes the phase fault of monitored high-tension distributing line is carried out the duplicate acknowledgment diagnosis in real time, and described voltage monitoring module and primary processor two join.
Described voltage monitoring module comprises current transformer that the electric current on the ground wire of transformer first siding ring is detected in real time and current transformer institute sensed current signal is converted to the I/V modular converter of corresponding voltage signal that described current transformer and I/V modular converter join.
Described wireless communication module one is short-range wireless communication module with wireless communication module two; Carry out two-way communication by the mobile communication network between described primary processor two and background monitoring main frame, and all be connected to the mobile communication module on primary processor two and the background monitoring main frame.
Described getting can electric capacity be connected with monitored high-tension distributing line by connection terminal, and described connection terminal with get energy electric capacity and join.
Described mobile communication network is GPRS network or cdma network.
The utility model compared with prior art has the following advantages:
1, simple in structure, volume is little, install to lay convenient and can carry out charged installation.
2, cost of investment is low, can realize large-scale promotion application.
3, perfect in shape and function and measuring accuracy grade height, fault judgement accuracy rate height; have functions such as protection, measurement, control, early warning during actual the use; and data transmission is convenient, and common mobile public network wireless communication modes such as (GSM, GPRS) can easy, fast carry out data transmission.
4, the practical value height, based on electric network fault location technology and wireless communication technology is the automatical and efficient fault detect and the locating device of one, comprise phase fault and single-phase earthing, its background monitoring system with distribution control center matches, can provide the indication information of abort situation and fault-time in a few minutes after fault takes place (time-delay of transmitting short message with local base station is relevant), help the maintenance personal to rush towards the scene rapidly, fix a breakdown, recover normal power supply, improve power supply reliability greatly, significantly reduce the fault track walker simultaneously, increase work efficiency, play a significant role for improving the distribution monitoring intelligentization.
5, for improving fault judgement device power supply power supply reliability, the power supply mode that adopts the high-performance lithium battery to combine with the electric capacity power taking.
In sum, the utility model reasonable in design, cost of investment are low, fault test precision height and practical value height, combine the advantage of existing FTU device and fault detector, efficiently solve the singlephase earth fault that exists in the power distribution network circuit and the accurate detection of phase fault, the quick transmission that detects data, the relevant issues such as working power of equipment.The utility model is by information such as online acquisition line load electric current, phase fault and single-phase earthings and will detect data upload to background management system by mobile public network (GPRS/CDMA), realize the function of online grasp circuit running status, when line fault takes place when, can notify line related operation maintenance personnel timely isolated fault section, get purpose thereby reach rapidly removing faults.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a fundamental diagram of the present utility model.
Fig. 2 is the schematic block circuit diagram of the utility model front-end detection device.
Fig. 3 is the schematic block circuit diagram of the utility model wireless data sending device.
Description of reference numerals:
1-front-end detection device; 1-1-load measurement unit; 1-2-different-frequency measure unit;
1-3-primary processor one; 1-4-wireless communication module one; The 1-5-overcurrent protection starts module; The 1-6-fast tripping protection starts 1-7-rectification circuit one; 1-8-rectification circuit two; Module;
The 1-9-filtering circuit; 2-wireless data sending device; 2-1-wireless communication module two;
2-2-primary processor two; The 2-32-transformer; The 2-33-power module;
The 2-3-supply module; 2-4-voltage monitoring module; The 2-41-current transformer;
The 2-42-I/V modular converter; 3-background monitoring main frame; The monitored high-tension distributing line of 4-;
5-mobile communication module; 6-gets can electric capacity.
Embodiment
As shown in Figure 1 and Figure 2, the utility model comprises three front- end detection devices 1 and 1 detection signal of three front-end detection devices is carried out analyzing and processing and the line fault result who analyzes is uploaded to synchronously the wireless data sending device 2 of background monitoring main frame 3, three front-end detection devices 1 equipotential respectively are installed in ABC three-phase in the monitored high-tension distributing line 4 on the distribution wire, all carry out two-way communication with communication between described wireless data sending device 2 and three front-end detection devices 1 and the background monitoring main frame 3.
In the present embodiment, described front-end detection device 1 comprises the load measurement unit 1-1 that the load current to monitored high-tension distributing line 4 detects in real time, the different-frequency measure unit 1-2 that the single-phase earthing state of monitored high-tension distributing line 4 is detected in real time, according to load measurement unit 1-1 and different-frequency measure unit 1-2 institute detection signal is diagnosed the line fault state and with the fault diagnosis report synchronized transmission to primary processor one 1-3 of wireless data sending device 2 and wireless communication module one 1-4 that joins with primary processor one 1-3, described load measurement unit 1-1 and different-frequency measure unit 1-2 all meet primary processor one 1-3.Be connected to rectification circuit one 1-7 between described load measurement unit 1-1 and primary processor one 1-3, be connected to rectification circuit two 1-8 between different-frequency measure unit 1-2 and primary processor one 1-3, described rectification circuit one 1-7 and rectification circuit two 1-8 all connect the A/D translation interface of primary processor one 1-3.Be connected to filtering circuit 1-9 between described different-frequency measure unit 1-2 and rectification circuit two 1-8.Described fault diagnosis report comprises fault diagnosis result, time of failure and the fault occurrence positions that the line fault state is diagnosed.
Simultaneously; described front-end detection device 1 also comprises overcurrent protection startup module 1-5 and the fast tripping protection startup module 1-6 that judges whether correspondingly to carry out overcurrent protection and fast tripping protection according to load measurement unit 1-1 institute detection signal; described load measurement unit 1-1 all starts module 1-5 with overcurrent protection and fast tripping protection startup module 1-6 joins, and described overcurrent protection starts module 1-5 and fast tripping protection startup module 1-6 all joins with primary processor two 1-2.
As shown in Figure 3, described wireless data sending device 2 comprises wireless communication module two 2-1 that are used with wireless communication module one 1-4, be uploaded to primary processor two 2-2 of background monitoring main frame 3 and the supply module 2-3 that joins with primary processor two 2-2 synchronously after wireless communication module one 1-4 institute transmission information is packed, and described wireless communication module one 1-4 and primary processor two 2-2 join.
As shown in Figure 3, described supply module 2-3 comprises transformer 2-32 and the power module 2-33 that joins with the second siding ring output terminal of transformer 2-32, transformer 2-32 with get and can join and get and can join with monitored high-tension distributing line 4 by electric capacity 6 by electric capacity 6.A terminals ground connection of described transformer 2-32 first siding ring and its another terminals can join with monitored high-tension distributing line 4 behind the electric capacity 6 through getting, and described power module 2-33 and primary processor two 2-2 join.Described primary processor one 1-3 and primary processor two 2-2 are single-chip microcomputer.Described supply module 2-3 also comprises the supplying cell that joins with primary processor two 2-2.
As shown in Figure 3, described wireless data sending device 2 also comprises the voltage monitoring module 2-4 that the voltage-to-ground of transformer 2-32 first siding ring is detected and realizes the phase fault of monitored high-tension distributing line 4 is carried out the duplicate acknowledgment diagnosis in real time, and described voltage monitoring module 2-4 and primary processor two 2-2 join.Described getting can electric capacity 6 be connected with monitored high-tension distributing line 4 by connection terminal, and described connection terminal with get energy electric capacity 6 and join.
As shown in Figure 3, described voltage monitoring module 2-4 comprises current transformer 2-41 that the electric current on the ground wire of transformer 2-32 first siding ring is detected in real time and current transformer 2-41 institute sensed current signal is converted to the I/V modular converter 2-42 of corresponding voltage signal that described current transformer 2-41 and I/V modular converter 2-42 join.
In the present embodiment, described wireless communication module one 1-4 and wireless communication module two 2-1 are short-range wireless communication module; 3 in described primary processor two 2-2 and background monitoring main frame carry out two-way communication by the mobile communication network, and all are connected to mobile communication module 5 on primary processor two 2-2 and the background monitoring main frame 3.Described mobile communication network is GPRS network or cdma network.
During the course of work of the present utility model: load measurement unit 1-1 in the described front-end detection device 1 and different-frequency measure unit 1-2 in real time to the load current of monitored high-tension distributing line 4 and the single-phase earthing state detects in real time and with the testing result synchronous driving to primary processor one 1-3, phase fault and singlephase earth fault that primary processor one 1-3 carries out analyzing and processing to the detection signal of load measurement unit 1-1 and different-frequency measure unit 1-2 and tackles monitored high-tension distributing line 4 are mutually diagnosed, and with fault diagnosis result, time of failure and fault occurrence positions are sent to primary processor two 2-2 by short-range wireless communication module after making fault diagnosis report; In addition; described overcurrent protection starts module 1-5 and fast tripping protection startup module 1-6 carries out overcurrent and fast tripping protection according to the corresponding needs that judge whether of the detection signal of load measurement unit 1-1 to monitored high-tension distributing line 4; and the judged result of correspondence reached primary processor one 1-3 synchronously, by primary processor one 1-3 overcurrent protection module and fast tripping protection module are carried out corresponding control again.
Correspondingly, after described primary processor two 2-2 receive the fault diagnosis report that primary processor one 1-3 sends and come, the fault diagnosis report that receives is carried out analysis and judgement, simultaneously trigger voltage monitoring modular 2-4 detects the voltage-to-ground of transformer 2-32 first siding ring and testing result is reached primary processor two 2-2, primary processor two 2-2 carry out the duplicate acknowledgment diagnosis according to voltage monitoring module 2-4 institute detectable voltage signals to the phase fault of monitored high-tension distributing line 4, and whether the phase fault diagnostic result of front-end detection device 1 correctly confirmed to judge, and primary processor one 1-3 sent and the fault diagnosis report of coming with confirm to be uploaded to background monitoring main frame 3 after the judged result packing.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (10)
1. distribution line fault judgement device, it is characterized in that: comprise three front-end detection devices (1) and three front-end detection devices (1) institute detection signal is carried out analyzing and processing and the line fault result who analyzes is uploaded to synchronously the wireless data sending device (2) of background monitoring main frame (3), three front-end detection devices (1) equipotential respectively are installed in ABC three-phase in the monitored high-tension distributing line (4) on the distribution wire, all carry out two-way communication with communication between described wireless data sending device (2) and three front-end detection devices (1) and the background monitoring main frame (3).
2. according to the described distribution line fault judgement of claim 1 device, it is characterized in that: described front-end detection device (1) comprises the load measurement unit (1-1) that the load current to monitored high-tension distributing line (4) detects in real time, the different-frequency measure unit (1-2) that the single-phase earthing state of monitored high-tension distributing line (4) is detected in real time, according to load measurement unit (1-1) and different-frequency measure unit (1-2) institute detection signal the line fault state is diagnosed and with the fault diagnosis report synchronized transmission to the primary processor one (1-3) of wireless data sending device (2) and the wireless communication module one (1-4) that joins with primary processor one (1-3), described load measurement unit (1-1) and different-frequency measure unit (1-2) all connect primary processor one (1-3).
3. according to the described distribution line fault judgement of claim 2 device; it is characterized in that: described front-end detection device (1) also comprises overcurrent protection startup module (1-5) and the fast tripping protection startup module (1-6) that judges whether correspondingly to carry out overcurrent protection and fast tripping protection according to load measurement unit (1-1) institute detection signal; described load measurement unit (1-1) all starts module (1-5) with overcurrent protection and fast tripping protection startup module (1-6) is joined, and described overcurrent protection starts module (1-5) and fast tripping protection startup module (1-6) is all joined with primary processor two (1-2).
4. according to claim 2 or 3 described distribution line fault judgement devices, it is characterized in that: described wireless data sending device (2) comprises the wireless communication module two (2-1) that is used with wireless communication module one (1-4), be uploaded to the primary processor two (2-2) of background monitoring main frame (3) and the supply module (2-3) that joins with primary processor two (2-2) synchronously after wireless communication module one (1-4) institute transmission information is packed, and described wireless communication module one (1-4) joins with primary processor two (2-2).
5. according to the described distribution line fault judgement of claim 4 device, it is characterized in that: described supply module (2-3) comprises transformer (2-32) and the power module (2-33) that joins with the second siding ring output terminal of transformer (2-32), transformer (2-32) with get and can join and get and can join with monitored high-tension distributing line (4) by electric capacity (6) by electric capacity (6); A terminals ground connection of described transformer (2-32) first siding ring and its another terminals can join with monitored high-tension distributing line (4) behind the electric capacity (6) through getting, and described power module (2-33) joins with primary processor two (2-2).
6. according to the described distribution line fault judgement of claim 5 device, it is characterized in that: described wireless data sending device (2) also comprises the voltage monitoring module (2-4) that the voltage-to-ground of transformer (2-32) first siding ring is detected and realizes the phase fault of monitored high-tension distributing line (4) is carried out the duplicate acknowledgment diagnosis in real time, and described voltage monitoring module (2-4) is joined with primary processor two (2-2).
7. according to the described distribution line fault judgement of claim 6 device, it is characterized in that: described voltage monitoring module (2-4) comprises current transformer (2-41) that the electric current on the ground wire of transformer (2-32) first siding ring is detected in real time and current transformer (2-41) institute sensed current signal is converted to the I/V modular converter (2-42) of corresponding voltage signal that described current transformer (2-41) joins with I/V modular converter (2-42).
8. according to the described distribution line fault judgement of claim 4 device, it is characterized in that: described wireless communication module one (1-4) is short-range wireless communication module with wireless communication module two (2-1); Carry out two-way communication by the mobile communication network between described primary processor two (2-2) and background monitoring main frame (3), and all be connected to mobile communication module (5) on primary processor two (2-2) and the background monitoring main frame (3).
9. according to the described distribution line fault judgement of claim 5 device, it is characterized in that: described get can electric capacity (6) be connected with monitored high-tension distributing line (4) by connection terminal, and described connection terminal with get energy electric capacity (6) and join.
10. according to the described distribution line fault judgement of claim 8 device, it is characterized in that: described mobile communication network is GPRS network or cdma network.
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| CN2010202050888U CN201673233U (en) | 2010-05-26 | 2010-05-26 | Distribution network line fault judger |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129008A (en) * | 2011-01-07 | 2011-07-20 | 杭州市电力局 | Fault detection device for distribution network |
| CN102981101A (en) * | 2012-12-13 | 2013-03-20 | 云南电网公司临沧供电局 | Detection method for misoperation prevention of power transmission line |
| CN103117885A (en) * | 2012-12-07 | 2013-05-22 | 长沙理工大学 | Intelligent power distribution network terminal abnormal communication automatic detection method based on data encryption standard (DES) principle |
| CN103412231A (en) * | 2013-07-09 | 2013-11-27 | 上海卫星工程研究所 | Distribution short circuit self checking device and method thereof |
| CN103532232A (en) * | 2013-10-10 | 2014-01-22 | 国家电网公司 | In-situ protection system of distribution network |
| CN104459441A (en) * | 2014-12-10 | 2015-03-25 | 国家电网公司 | Method for preventing misoperation in process of line maintenance |
| CN104678259A (en) * | 2015-03-11 | 2015-06-03 | 浙江科畅电子有限公司 | Single-phase earth fault finding device |
| CN104931836A (en) * | 2015-06-30 | 2015-09-23 | 国家电网公司 | Power grid monitoring and early warning system |
| CN104931859A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | Fault monitoring device based on distributed wave recording |
| CN105137280A (en) * | 2015-08-01 | 2015-12-09 | 国家电网公司 | Fault warning device suitable for 10 kilovolt distribution line |
| CN106990329A (en) * | 2017-05-16 | 2017-07-28 | 国家电网公司 | A kind of distribution line dead electricity alarm signal harvester |
| CN110031723A (en) * | 2019-04-24 | 2019-07-19 | 袁超 | The intelligent switch and its detection method of line fault are detected before a kind of combined floodgate |
| CN110068743A (en) * | 2019-03-25 | 2019-07-30 | 国网山东省电力公司临沂供电公司 | Distribution scheduling intelligent detection device based on voice prompting |
| CN110687402A (en) * | 2019-11-05 | 2020-01-14 | 国网安徽省电力有限公司芜湖供电公司 | Line fault positioning method and device based on intelligent switch parameters |
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2010
- 2010-05-26 CN CN2010202050888U patent/CN201673233U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129008A (en) * | 2011-01-07 | 2011-07-20 | 杭州市电力局 | Fault detection device for distribution network |
| CN103117885A (en) * | 2012-12-07 | 2013-05-22 | 长沙理工大学 | Intelligent power distribution network terminal abnormal communication automatic detection method based on data encryption standard (DES) principle |
| CN103117885B (en) * | 2012-12-07 | 2016-04-13 | 长沙理工大学 | The abnormal automatic detection method of intelligent distribution network terminal called based on DES theory |
| CN102981101A (en) * | 2012-12-13 | 2013-03-20 | 云南电网公司临沧供电局 | Detection method for misoperation prevention of power transmission line |
| CN103412231B (en) * | 2013-07-09 | 2015-11-18 | 上海卫星工程研究所 | Distribution short circuit self-checking unit and method |
| CN103412231A (en) * | 2013-07-09 | 2013-11-27 | 上海卫星工程研究所 | Distribution short circuit self checking device and method thereof |
| CN103532232B (en) * | 2013-10-10 | 2016-04-27 | 国家电网公司 | A kind of in-situ protection system of distribution |
| CN103532232A (en) * | 2013-10-10 | 2014-01-22 | 国家电网公司 | In-situ protection system of distribution network |
| CN104459441A (en) * | 2014-12-10 | 2015-03-25 | 国家电网公司 | Method for preventing misoperation in process of line maintenance |
| CN104678259A (en) * | 2015-03-11 | 2015-06-03 | 浙江科畅电子有限公司 | Single-phase earth fault finding device |
| CN104931836A (en) * | 2015-06-30 | 2015-09-23 | 国家电网公司 | Power grid monitoring and early warning system |
| CN104931859A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | Fault monitoring device based on distributed wave recording |
| CN105137280A (en) * | 2015-08-01 | 2015-12-09 | 国家电网公司 | Fault warning device suitable for 10 kilovolt distribution line |
| CN106990329A (en) * | 2017-05-16 | 2017-07-28 | 国家电网公司 | A kind of distribution line dead electricity alarm signal harvester |
| CN110068743A (en) * | 2019-03-25 | 2019-07-30 | 国网山东省电力公司临沂供电公司 | Distribution scheduling intelligent detection device based on voice prompting |
| CN110031723A (en) * | 2019-04-24 | 2019-07-19 | 袁超 | The intelligent switch and its detection method of line fault are detected before a kind of combined floodgate |
| CN110031723B (en) * | 2019-04-24 | 2022-04-01 | 袁超 | Intelligent switch for detecting line fault before closing and detection method thereof |
| CN110687402A (en) * | 2019-11-05 | 2020-01-14 | 国网安徽省电力有限公司芜湖供电公司 | Line fault positioning method and device based on intelligent switch parameters |
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