CN205038271U - No line locking zinc oxide arrester on -line monitoring device of distributing type - Google Patents

No line locking zinc oxide arrester on -line monitoring device of distributing type Download PDF

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Publication number
CN205038271U
CN205038271U CN201520657229.2U CN201520657229U CN205038271U CN 205038271 U CN205038271 U CN 205038271U CN 201520657229 U CN201520657229 U CN 201520657229U CN 205038271 U CN205038271 U CN 205038271U
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China
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wireless
arrester
collecting unit
leakage current
server
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Expired - Fee Related
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CN201520657229.2U
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Chinese (zh)
Inventor
陈�光
马勇
周志成
付慧
王小军
龚引颖
周治国
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Beijing Creative Chip Expert Technology Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Beijing Creative Chip Expert Technology Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Application filed by Beijing Creative Chip Expert Technology Co Ltd, State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd filed Critical Beijing Creative Chip Expert Technology Co Ltd
Priority to CN201520657229.2U priority Critical patent/CN205038271U/en
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Publication of CN205038271U publication Critical patent/CN205038271U/en
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Abstract

The utility model discloses a no line locking zinc oxide arrester on -line monitoring device of distributing type, including the cloud ware, stand in wireless server, leakage current of an arrester acquisition unit, reference voltage acquisition unit, network terminal and on -site terminal, the high in the clouds server of cloud ware for purchaseing or renting is moving arrester monitoring management server software, wireless server includes that the wireless LAN twine inserts module, radio frequency clock time service main website, wireless mobile network communication module, host system and battery in standing, leakage current of an arrester acquisition unit and reference voltage acquisition unit all include voltage transformer, voltage signal modulate circuit, AD, CPU, GPSBD clock time service module, radio frequency clock synchronization module, wireless network interface card, antenna, display screen and battery, being applicable to and carrying out on -line monitoring to operating metal oxide lightning arrester state, the operating condition of all arresters will look over the equipment state through the arbitrary networking of on -site terminal through passing to the cloud ware on the network.

Description

Distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device
Technical field
The utility model relates to a kind of distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device, particularly relate to a kind of Hyper-Voltage of Power Systems protection on-line monitoring device of metallic oxide arrester, based on the realization of the distributed power data sampling and processing of internet and wireless communication technology, analysis, storage mode, belong to intelligent T & D Technology field.
Background technology
Metal oxide arrester MOA is universally acknowledged most advanced lightning protection electrical equipment in the present age.Bear the factor impacts such as system voltage, superpotential, filth and internal wetted due to Zinc-Oxide Arrester for a long time, make its decreasing insulating, nonlinear characteristic lost efficacy, cause MOA aging, even explode, not only cause huge economic loss, and serious threat is to the safe operation of electrical network.Therefore, the insulating property of lightning arrester are tested, can find early and fix a breakdown, the generation of Accident prevention.
Zinc-Oxide Arrester mainly adopts the mode of prophylactic repair, its operation characteristic of comprehensive descision is carried out by the ac leakage current under live detection working voltage and offline inspection, prophylactic repair has the deficiency of two aspects: one is equipment when there is potential unsafe factor, because not getting rid of hidden danger in time to the repair time; Two is that equipment state is good, but to the repair time, just must overhaul, and maintenance exists very large blindness, causes the waste of human and material resources, and maintenance effect is also bad.
Utility model content
Object: in order to overcome the deficiencies in the prior art, for the problem that change Zinc-Oxide Arrester prophylactic repair mode is brought, the utility model provides a kind of distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device, based on internet and full Wireless digital synchronization network, realize the equipment state evaluation to Zinc-Oxide Arrester, risk assessment, thus formulation maintenance decision, make equipment safe and reliable to operation, the cost of overhaul is reasonable.
Technical scheme: for solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device, is characterized in that: comprise Cloud Server, stand interior wireless server, leakage current of an arrester collecting unit, reference voltage collecting unit, on-site terminal and the network terminal; Cloud Server is the cloud server bought or rent, and runs lightning arrester on-line monitoring server software system; In standing, wireless server comprises WLAN access module, radio frequency clock time service main website, mobile radio network communication module, main control module and battery; Leakage current of an arrester collecting unit and reference voltage collecting unit include voltage transformer (VT), voltage signal conditioning circuit, AD, CPU, GPS/BD clock time service module, radio frequency clock synchronization module, wireless network card, antenna, display screen and battery; On-site terminal and the network terminal are be provided with the computer of Zinc-Oxide Arrester live detection software or browser, mobile phone, panel computer or embedded device;
In standing, wireless server provides insertion point of radio local network; In leakage current of an arrester collecting unit, reference voltage collecting unit and station, wireless server carries out radio communication by WLAN (wireless local area network), the data gathered give wireless server in station by wireless network transmissions, then data processing, local preservation are uploaded to Cloud Server by server of standing, and user accesses Cloud Server by on-site terminal; Leakage current of an arrester collecting unit and reference voltage collecting unit by GPS or big-dipper satellite time service, or pass through the time service of wireless radiofrequency time service main website; The temporal information of wireless radiofrequency time service main website derives from GPS or big-dipper satellite, or adopts inner high precision time service clock.
In standing between wireless server, leakage current of an arrester collecting unit, reference voltage collecting unit, on-site terminal four parts, adopt the fast wireless network group-net communication of public free frequency range.
Described Cloud Server, is the webserver bought or rent, runs lightning arrester on-line monitoring server software system; On-line monitoring server software system, possesses mass data reception, storage, analytic function, can provide internet checking function, provide alarm information pushing function.
Wireless server in described station, comprises WLAN access module, radio frequency clock time service main website, mobile radio network communication module, main control module, battery; Described WLAN access module provide can more than sighting distance 1km WLAN cover; Radio frequency clock time service main website obtains precision clock by GPS/BD big-dipper satellite, and built-in high precision is kept time module, though with synchronous satellite lost contact, also can ensure that clock synchronous network continues to run; The digital signal that temporal information is converted to radio-frequency range by wireless radiofrequency clock time service module sends, and provides the indoor and outdoor wireless radiofrequency clock time service network coverage of more than 500m; Main control module is embedded processing systems, can receive online monitoring data, data is preserved in the specific format and processes, and then upload the data to Cloud Server by mobile radio network communication module; Battery can when primary power source de-energizes for interior wireless server of standing provides uninterrupted power source, and during primary power source de-energizes, system will be reported to the police.
Described leakage current of an arrester collecting unit, every three unit are classified as one group, each group possesses independently organizes ID, each unit possesses independently No. ID, unit and network IP, often organize leakage current of an arrester collecting unit and can carry out data acquisition to A, B, C three-phase lightning protector, each leakage current of an arrester collecting unit carries out leakage current data collection to a lightning arrester separately, data are uploaded by wireless network, connect without the need to cable between each leakage current of an arrester collecting unit, thus realize the complete wireless penetration communication between all collecting units.
Described leakage current of an arrester collecting unit possesses electronic label identification function, when mounted by identifying that lightning arrester electronic labeling information reads lightning arrester facility information automatically, and corresponding lightning arrester information is automatically uploaded when uploading the leakage current information of collection, realize the flexible binding between leakage current of an arrester collecting unit and institute's survey lightning arrester and record; Lightning arrester electronic tag is passive electronic label.
Described leakage current of an arrester collecting unit and reference voltage collecting unit inside adopt the mode of GPS/BD module and the time service of radio frequency clock synchronization module bimodulus, the GPS/BD adopting precision higher under outdoor conditions is synchronous, when indoor are without GPS/BD signal, changeable is radio frequency clock synchronous mode, by the radio frequency clock time service main website in wireless server in described station at outdoor acquisition GPS/BD signal, convert radiofrequency signal again to and send to radio frequency clock synchronization module, realize the clock synchronous between each collecting unit;
Described leakage current of an arrester collecting unit and reference voltage collecting unit drive the inner AD of each collecting unit to carry out analog to digital conversion by synchronous clock signal, thus realize the synchronous acquisition of data; The data gathered are combined into Frame and stamp accurate synchronized timestamp, upload the interior wireless server that arrives at a station, and interior wireless server of stand to align Wave data computational analysis draws testing result according to the timestamp in Frame.
Described on-site terminal is run the computer or the embedded device that there are Zinc-Oxide Arrester live detection software systems, such as: possess display screen, touch-screen or keyboard and mouse, WiFi wireless device, the panel computer of storage medium, notebook computer, mobile phone or embedded device, on-site terminal runs Zinc-Oxide Arrester live detection software, by wireless server in WLAN (wireless local area network) access station, query facility state.
The described network terminal is smart mobile phone, computer, panel computer or other smart machine, the described network terminal by browser or network terminal softward interview Cloud Server query facility state, type of alarm is set.
The data frame format that in described station, wireless server is uploaded comprises site information, circuit number, lightning arrester numbering, timestamp, Monitoring Data information.
Described leakage current of an arrester collecting unit and reference voltage collecting unit are powered mainly through internal battery, powered simultaneously and charge to internal battery by external solar cell to collecting unit; And/or; Described leakage current of an arrester collecting unit and reference voltage collecting unit are except synchronous acquisition and direct uploading data function, also possesses the function of the parameters of electric power such as local computing effective value, phase place, harmonic wave, result of calculation is bundled in Frame uploads the interior wireless server that arrives at a station, in standing, wireless server is according to after timestamp align data frame, and direct taking-up result of calculation is carried out analysis and obtained testing result.
The monitoring method of above-mentioned distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device is:
1) reference voltage collecting unit gathers voltage data, stamps precise time and stabs and upload the interior wireless server that arrives at a station;
2) leakage current of an arrester collecting unit gathers leakage current data, stamps precise time and stabs and upload the interior wireless server that arrives at a station;
3) data are alignd by interior wireless server of standing in time, and carry out computing to data, result is stored in this locality, then site information, lightning arrester information, a series of data frame format of data processed result is uploaded to Cloud Server;
4) Cloud Server is further processed data, and when detecting an abnormal condition it, trigger alarm immediately, sends warning message by phone, note, micro-letter, Email to registered user; And push warning message to the network terminal being connected to server;
5) the lightning arrester Monitoring Data of Cloud Server to all transformer stations stores, and provides data query and large data analysis function, can carry out overall Evaluation and Prediction to the lightning arrester duty of various brand, producer, model, condition of work.
Beneficial effect: the distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device that the utility model provides, communicated by the fast wireless network of open free frequency range between equipment, in standing, wireless server is by data summarization, local preservation, then uploads to Cloud Server by mobile communications network; Leakage current of an arrester collecting unit and reference voltage collecting unit can carry out Precision Clock Synchronization by GPS/BD or radio frequency clock synchronization module; All constituents all can adopt internal battery to power.The utility model is applicable to carry out on-line monitoring to operating state of metal oxide lightning arrester, the duty of all lightning arresters all will upload to Cloud Server by mobile communications network, power system management person or relevant staff are by mobile phone, notebook or computer, the networking of any place can check equipment state at any time, when maybe may go wrong appears in equipment, cloud server can pass through the mode active push warning messages such as note, phone, micro-letter.
Accompanying drawing explanation
Fig. 1 is global network schematic diagram of the present utility model;
Fig. 2 is the schematic diagram of the utility model each several part.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, be a kind of distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device, comprise Cloud Server, stand in wireless server, leakage current of an arrester collecting unit, reference voltage collecting unit, on-site terminal and the network terminal; Cloud Server is the cloud server bought or rent, and runs lightning arrester monitoring management server software; In standing, wireless server comprises WLAN access module, radio frequency clock time service main website, mobile radio network communication module, main control module and battery; Leakage current of an arrester collecting unit comprises current transformer, current signal conditioning circuit, AD, CPU, GPS/BD clock time service module, radio frequency clock synchronization module, wireless network card, antenna, display screen and battery; Reference voltage collecting unit comprises voltage transformer (VT), voltage signal conditioning circuit, AD, CPU, GPS/BD clock time service module, radio frequency clock synchronization module, wireless network card, antenna, display screen and battery; On-site terminal and the network terminal are be provided with the computer of terminal software or browser, mobile phone, panel computer or other embedded device.
Leakage current of an arrester collecting unit, reference voltage collecting unit, on-site terminal, stand in wireless server carry out radio communication by WLAN (wireless local area network), leakage current of an arrester collecting unit and reference voltage collecting unit carry out time service by GPS or big-dipper satellite, also can by the time service of wireless radiofrequency time service main website, the temporal information of wireless radiofrequency time service main website can derive from GPS or big-dipper satellite, also can adopt inner high precision time service clock.
As shown in Figure 2, in standing, wireless server inside comprises wireless network access module, radio frequency clock time service main website, mobile radio network communication module, wireless network access module provides a powerful WLAN (wireless local area network) to cover, coverage is can under line of sight conditions at least 1 kilometer, wireless device in coverage can access into, radio frequency clock time service main website is mainly through obtaining the temporal information of GPS or the Big Dipper, then convert this information to radio frequency clock signals to send, radiofrequency signal covering is carried out to more than 500 meters scopes, in scope, the radio frequency clock synchronization module of indoor and outdoor can accept this signal, the function that mobile radio network communication module provides mobile Internet to access.
Leakage current signal is converted to the voltage signal that can gather for AD by current transformer and modulate circuit by leakage current of an arrester collecting unit, processor program triggers by the pps pulse per second signal of GPS/BD module or radio frequency synchronization module, produce and gather clock and corresponding sequential, drive AD image data, simultaneous processor program resolves the temporal information of the serial form that synchronization module transmits, data stamped timestamp and is packaged as specific format Frame, then uploading by WLAN the interior wireless server that arrives at a station; In standing, wireless server saves the data in local data base, then packs the data to the Frame comprising the information such as site information, line information, lightning arrester numbering and uploads to Cloud Server; Data stored in database, are analyzed abnormal data by Cloud Server simultaneously, initiative alarming when finding that lightning arrester has a problem.
As shown in Figure 2, leakage current of an arrester collecting unit possesses electronic label identification function, when live detection by identifying that lightning arrester electronic labeling information reads lightning arrester facility information automatically, and corresponding lightning arrester information is automatically uploaded when uploading the leakage current information of collection, realize automatic binding and the record of live detection data.
Reference voltage collecting unit only needs one in systems in which, and provide reference for all resistive leakage currents calculate, except front end mutual inductor is different from modulate circuit, other parts principle is the same with described leakage current of an arrester collecting unit with workflow.
On-site terminal is run the computer or the embedded device that there are Zinc-Oxide Arrester live detection software systems, can be notebook computer, panel computer, mobile phone or other embedded device; Described on-site terminal does not need to be connected to internet can check Monitoring Data.
The Install and configure flow process of the utility model distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device is:
In standing, wireless server is placed in place, access civil power, power-on;
With reference to voltage acquisition unit gathering line access secondary voltage terminal, if in indoor, access civil power, connects solar panel when outdoor, power-on;
Leakage current of an arrester collecting unit is installed to tested lightning arrester relevant position, first use collecting unit to scan tested lightning arrester electronic tag before installation and read lightning arrester facility information, manually input lightning arrester facility information without during electronic tag, connect solar panel, power-on;
Open on-site terminal, open Zinc-Oxide Arrester on-line monitoring terminal software, all collecting units in autoscan station, configure the leakage current of an arrester collecting unit disposed, and associate corresponding with actual lightning arrester for leakage current of an arrester groups of acquisition units ID and single ID; Check each collecting unit duty
Open the browser on on-site terminal, connect the interior wireless server that arrives at a station, wireless server in configuration station, is connected on Cloud Server, this website is registered to Cloud Server.
Open the computer that mobile phone maybe can connect internet, input Cloud Server network address, input account password login system, checks configured website, checks that whether the duty of all monitoring collecting units of our station is correct, checks that whether lightning arrester duty is normal.Configuration type of alarm, the contact method of warning object, comprises telephone number, micro-signal, addresses of items of mail etc.
By the ann test function on on-site terminal software, select certain lightning arrester of our station as simulated failure point, outwards send simulated failure data;
Cloud Server detects fault data, trigger alarm, sends information by phone, note, micro-letter, Email to warning object;
Warning object receives warning message, and proof system is working properly;
Operation system setting is complete, starts normally to work.
The monitoring method of the utility model distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device is:
Reference voltage collecting unit gathers voltage data, stamps precise time and stabs and upload the interior wireless server that arrives at a station;
Leakage current of an arrester collecting unit gathers leakage current data, stamps precise time and stabs and upload the interior wireless server that arrives at a station;
In standing, data are alignd by wireless server in time, and carry out computing to data, result is stored in this locality, then by site information, lightning arrester information, data processed result etc., uploads to Cloud Server;
Cloud Server is further processed data, and when detecting an abnormal condition it, trigger alarm immediately, sends warning message by phone, note, micro-letter, Email to registered user; And push warning message to the network terminal being connected to server;
The lightning arrester Monitoring Data of Cloud Server to all transformer stations stores, and provides data query and large data analysis function, can carry out overall Evaluation and Prediction to the lightning arrester duty of various brand, producer, model, condition of work.
The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (4)

1. a distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device, is characterized in that: comprise Cloud Server, stand in wireless server, leakage current of an arrester collecting unit, reference voltage collecting unit, on-site terminal and the network terminal; Cloud Server is cloud server; In standing, wireless server comprises WLAN access module, radio frequency clock time service main website, mobile radio network communication module, main control module and battery; Leakage current of an arrester collecting unit and reference voltage collecting unit include voltage transformer (VT), voltage signal conditioning circuit, AD, CPU, GPS/BD clock time service module, radio frequency clock synchronization module, wireless network card, antenna, display screen and battery; On-site terminal and the network terminal are computer, mobile phone, panel computer or embedded device;
In standing, wireless server provides insertion point of radio local network; In leakage current of an arrester collecting unit, reference voltage collecting unit and station, wireless server carries out radio communication by WLAN (wireless local area network), the data gathered give wireless server in station by wireless network transmissions, then data processing, local preservation are uploaded to Cloud Server by server of standing, and user accesses Cloud Server by on-site terminal; Leakage current of an arrester collecting unit and reference voltage collecting unit by GPS or big-dipper satellite time service, or pass through the time service of wireless radiofrequency time service main website; The temporal information of wireless radiofrequency time service main website derives from GPS or big-dipper satellite, or adopts inner high precision time service clock.
2. distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device according to claim 1, is characterized in that: in described station in wireless server; WLAN access module provide can more than sighting distance 1km WLAN cover; Radio frequency clock time service main website obtains precision clock by GPS/BD big-dipper satellite, and built-in high precision is kept time module; The digital signal that temporal information is converted to radio-frequency range by wireless radiofrequency clock time service module sends, and provides the indoor and outdoor wireless radiofrequency clock time service network coverage of more than 500m; Main control module is embedded processing systems, can receive online monitoring data, data is preserved in the specific format and processes, and then upload the data to Cloud Server by mobile radio network communication module; Battery can when primary power source de-energizes for interior wireless server of standing provides uninterrupted power source.
3. distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device according to claim 1, it is characterized in that: described leakage current of an arrester collecting unit, every three unit are classified as one group, each group possesses independently organizes ID, each unit possesses independently No. ID, unit and network IP, often organize leakage current of an arrester collecting unit and can carry out data acquisition to A, B, C three-phase lightning protector, each leakage current of an arrester collecting unit carries out leakage current data collection to a lightning arrester separately, and data are uploaded by wireless network.
4. distributed wireless Simultaneous Oxidation zinc lightning arrester on-Line Monitor Device according to claim 1, it is characterized in that: described leakage current of an arrester collecting unit possesses electronic label identification function, when mounted by identifying that lightning arrester electronic labeling information reads lightning arrester facility information automatically, and corresponding lightning arrester information is automatically uploaded when uploading the leakage current information of collection, realize the flexible binding between leakage current of an arrester collecting unit and institute's survey lightning arrester and record.
CN201520657229.2U 2015-08-27 2015-08-27 No line locking zinc oxide arrester on -line monitoring device of distributing type Expired - Fee Related CN205038271U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093080A (en) * 2015-08-27 2015-11-25 国家电网公司 Distributed wireless synchronous zinc oxide lightning arrester online monitoring apparatus
CN105954632A (en) * 2016-07-01 2016-09-21 国网江苏省电力公司宿迁供电公司 Zinc oxide lightning arrester on-line monitoring and diagnostic method
CN106526401A (en) * 2016-11-28 2017-03-22 唐恩(厦门)电气有限公司 Distributed lightning arrester online monitoring system
CN106789403A (en) * 2016-11-30 2017-05-31 国网安徽省电力公司宣城供电公司 A kind of intelligent substation relay protection network pressure automatic testing equipment and method
CN109638966A (en) * 2018-12-28 2019-04-16 广州中光电气科技有限公司 A kind of monitoring of arrester intelligent online, data remote visualization cloud platform system
CN109870625A (en) * 2019-02-25 2019-06-11 国网福建省电力有限公司漳州供电公司 A kind of Zinc-Oxide Arrester live line measurement device based on wireless communication
CN110244102A (en) * 2019-07-29 2019-09-17 广东电网有限责任公司 A kind of leakage current of an arrester on-line monitoring leakage current mutual inductor and on-line monitoring system
CN112907928A (en) * 2021-01-26 2021-06-04 徐州徐工矿业机械有限公司 Wireless synchronous acquisition and classification system for multiple signals of excavator
CN112924898A (en) * 2020-12-30 2021-06-08 广东电网有限责任公司电力科学研究院 Inside full current measuring device of metal oxide arrester
CN113049983A (en) * 2021-03-12 2021-06-29 广西电网有限责任公司电力科学研究院 Lightning arrester leakage current non-contact wireless monitoring system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093080A (en) * 2015-08-27 2015-11-25 国家电网公司 Distributed wireless synchronous zinc oxide lightning arrester online monitoring apparatus
CN105954632A (en) * 2016-07-01 2016-09-21 国网江苏省电力公司宿迁供电公司 Zinc oxide lightning arrester on-line monitoring and diagnostic method
CN105954632B (en) * 2016-07-01 2019-02-19 国网江苏省电力公司宿迁供电公司 A kind of Zinc-Oxide Arrester on-line monitoring and diagnostic method
CN106526401A (en) * 2016-11-28 2017-03-22 唐恩(厦门)电气有限公司 Distributed lightning arrester online monitoring system
CN106789403A (en) * 2016-11-30 2017-05-31 国网安徽省电力公司宣城供电公司 A kind of intelligent substation relay protection network pressure automatic testing equipment and method
CN109638966A (en) * 2018-12-28 2019-04-16 广州中光电气科技有限公司 A kind of monitoring of arrester intelligent online, data remote visualization cloud platform system
CN109870625A (en) * 2019-02-25 2019-06-11 国网福建省电力有限公司漳州供电公司 A kind of Zinc-Oxide Arrester live line measurement device based on wireless communication
CN110244102A (en) * 2019-07-29 2019-09-17 广东电网有限责任公司 A kind of leakage current of an arrester on-line monitoring leakage current mutual inductor and on-line monitoring system
CN112924898A (en) * 2020-12-30 2021-06-08 广东电网有限责任公司电力科学研究院 Inside full current measuring device of metal oxide arrester
CN112907928A (en) * 2021-01-26 2021-06-04 徐州徐工矿业机械有限公司 Wireless synchronous acquisition and classification system for multiple signals of excavator
CN113049983A (en) * 2021-03-12 2021-06-29 广西电网有限责任公司电力科学研究院 Lightning arrester leakage current non-contact wireless monitoring system

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