CN106841938A - A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device - Google Patents
A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device Download PDFInfo
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- CN106841938A CN106841938A CN201611198879.0A CN201611198879A CN106841938A CN 106841938 A CN106841938 A CN 106841938A CN 201611198879 A CN201611198879 A CN 201611198879A CN 106841938 A CN106841938 A CN 106841938A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 title claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 23
- 230000006855 networking Effects 0.000 claims description 8
- 230000011664 signaling Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000004807 localization Effects 0.000 abstract description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 230000008054 signal transmission Effects 0.000 description 8
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Testing Relating To Insulation (AREA)
Abstract
Device and signal waveform processor are focused on the invention discloses a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, including partial discharge sensor, electrical to optical converter, signal, the partial discharge sensor is connected by high-frequency line with electrical to optical converter；The electrical to optical converter focuses on device and is connected by optical fiber and signal；The signal is focused on device and is connected with signal waveform processor by high-frequency line, control line and netting twine；This Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, the signal of collection can be carried out in situ lossless, without deformation electro-optic conversion by the system terminal of Optical Fiber Transmission analog optical signal with unification unit, the signal monitoring of different frequency range is carried out to multichannel three-phase monitoring point simultaneously, can be by lossless reduction waveform, coupled computer is analyzed localization process using time difference technology to Partial discharge signal, software each measuring point monitoring data of centralization display simultaneously can be coordinated, CSRC data processing platform (DPP) MS can simultaneously make a general survey of all fronts partial discharge monitoring state, its simple structure, it is easy to operate and can improve to cable run safeguard instant validity, simple operation and stablize accuracy.
Description
Technical field
The present invention relates to Voltage Cable Lines Construction partial discharge on-line monitoring technique field, specifically a kind of Optical Fiber Transmission centralization office
Put on-Line Monitor Device.
Background technology
High-tension apparatus occur in use it is aging, it is aging after easily there is partial discharge phenomenon, shelf depreciation meeting
Cause the generation of electric power accident, directly or indirectly economic loss is produced afterwards, therefore, long-term office is carried out to high-tension electricity equipment
Put on-line monitoring to be necessary, according to the feature of Partial discharge signal, Partial discharge signal is very small, and frequency distribution is in 1-
Between 50MHz, within this frequency range can along with a certain size background noise, its be according to the wiring construction of power system and
The difference of manufacture craft, size and the frequency range distribution of noise is different to be judged.
Existing long-term partial discharge on-Line Monitor Device mainly by be distributed in each monitoring point on cable run with regard to background
The data to collecting of standing are acted upon, and data are analyzed by the mother station of data transfer to backstage, work as cable run
When more long on the spot substation number may up to more than ten even dozens of so that on the spot substation generally dispersion be widely distributed on whole piece circuit,
Data acquisition process is not concentrated, and signal transmission latency issue causes background process data easily to malfunction, and total system is unstable；It is early
The monitoring device of phase is merely able to that the signal by fixation, single band-pass filter of frequency band to collecting is analyzed and sentenced
Not；Visualization processing is also only capable of displaying a certain measuring point data, it is impossible to while intuitively showing all measuring point monitoring situations.This kind of monitoring
Technology is disadvantageous in that：When a certain frequency band filter chosen is accompanied by background noise effects, can not be supervised by center
Control data processing platform (DPP) MS remotely switches frequency range, filtering noise observation signal state；CSRC data processing platform (DPP) shows number
According to it is not directly perceived not comprehensively, monitoring information is unable to centralized displaying.Erroneous judgement, misjudgement of the equipment to local discharge signal will be caused, when
When early monitoring device finds doubtful local discharge signal, to further determine that fault waveform and the positioning to trouble point, survey
Examination personnel need to carry the accurate measurement such as oscillograph, frequency spectrograph equipment and carry out repetition measurement to scene, and so numerous and diverse monitoring testing process causes
The practicality reduction of partial discharge on-line monitoring system.Therefore, we have proposed it is a kind of the signal of collection can be carried out in situ it is lossless
Consumption, the fibre-optic transmission system (FOTS) terminal transmitted without deformation electro-optic conversion and with analog signal form match somebody with somebody a unification unit, while to many
Road three-phase monitoring point carries out the signal monitoring of different frequency range, and analog signal can be utilized by lossless reduction waveform, coupled computer
Time difference technology is analyzed localization process to fault-signal, and simple structure, easy to operate, and signal transmission uses speed
Faster optical fiber, CSRC data processing platform (DPP) MS almost can with the full measuring point signal of no-delay centralized displaying full line, while
All fronts situation is made a general survey of, and the optical fiber of the instant validity, simple operation and stabilization accuracy safeguarded to cable run can be improved
The centralized partial discharge on-Line Monitor Device of transmission.
The content of the invention
It is an object of the invention to provide a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, with simple structure,
It is easy to operate and can improve to cable run safeguard instant validity, simple operation and stabilization accuracy the characteristics of, with solve
The problem proposed in certainly above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, including partial discharge sensor, electrical to optical converter, signal are focused on
Device and signal waveform processor, the partial discharge sensor are connected by high-frequency line with electrical to optical converter, the side of electrical to optical converter
It is provided with electrical to optical converter power interface, analog input interface and optical fiber output interface；The electrical to optical converter passes through light
Fibre focuses on device and is connected with signal, and it is single by photoelectric conversion unit, waveform selecting unit, passage switching that signal focuses on device
Unit, phase acquisition unit, Digital Signals expanding element, analogy signal processing unit, multiband bandpass filter and high speed
A/D is changed and constituted with Digital Signals unit, and the side that signal focuses on device is provided with optical fiber input interface, equal with its
Capable side is provided with waveform output interface, external phase input interface, Phase-switching switch, signal and focuses on device power supply and open
Close and power supply indicator, the side that signal focuses on device is provided with Partial discharge signal networking output interface and controlled output interface,
Side in parallel is provided with signal and focuses on device power interface；The signal focuses on device by high-frequency line, control
Line processed and netting twine are connected with signal waveform processor, and the super high-speed A/D that is internally provided with of signal waveform processor is changed and numeral
Signaling control unit, the side of signal waveform processor is provided with control input interface, and side in parallel is provided with letter
Number waveform processor power interface and signal waveform processor power supply switch, the side of signal waveform processor is provided with partial discharge
Signal network input interface and integrated data network output interface, the bottom of signal waveform processor is provided with Waveform Input and connects
Mouthful.
As further scheme of the invention：The photoelectric conversion unit is single with waveform selecting unit and passage switching respectively
Unit's connection, passage switch unit is connected with analogy signal processing unit, analogy signal processing unit and multiband bandpass filter
Connection, multiband bandpass filter is connected with high-speed a/d conversion with Digital Signals unit, and high-speed a/d conversion is believed with numeral
Number control unit is also electrically connected with phase acquisition unit and Digital Signals expanding element respectively.
Compared with prior art, beneficial effect of the present invention：
This Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, by partial discharge sensor, electrical to optical converter, signal waveform treatment
Device, signal focus on the setting of device, and wherein device obtains signal, electricity is transferred signals to by high-frequency line by partial discharge sensor
Electro-optic conversion is carried out to signal in photoconverter, optical signal focuses on device by Optical Fiber Transmission to signal, at signal concentration
Inside reason device, the optical signal that will be collected by photoelectric conversion unit first is converted into electric signal, and photoelectric conversion unit is to each
Channel acquisition to signal all there is two-way to export respectively, respectively interface channel switch unit and waveform selecting unit, by passage
Switch unit selection will monitor the signal of passage, and the signal transmission after the completion of selection is carried out at signal to analogy signal processing unit
Reason, the signal transmission after analogy signal processing unit treatment carries out frequency band signals selection to multiband bandpass filter, has selected
Signal transmission after is digitized treatment to signal to high-speed a/d conversion with Digital Signals unit, is selected by waveform
Selecting Unit selection will monitor the waveform of passage, signal waveform processor be transferred signals to by high-frequency line, by signal waveform
Super high-speed A/D conversions in reason device reduce waveform with Digital Signals unit, wherein, passage switch unit, waveform selection
Unit, multiband bandpass filter are all changed and Digital Signals unit control selections by high-speed a/d, it is achieved thereby that this light
The centralized partial discharge on-Line Monitor Device of fibre transmission can by the signal of collection carry out it is lossless, without deformation electro-optic conversion and by optical fiber
The system terminal of analog optical signal is transmitted with unification unit, while carrying out the signal prison of different frequency range to multichannel three-phase monitoring point
Survey, localization process can be analyzed to Partial discharge signal using time difference technology by lossless reduction waveform, coupled computer, can match somebody with somebody
Software each measuring point monitoring data of centralization display simultaneously is closed, CSRC data processing platform (DPP) MS can simultaneously make a general survey of all fronts partial discharge prison
Survey state, and it is simple structure, easy to operate and instant validity, simple operation and the stabilization safeguarded to cable run can be improved
The characteristics of accuracy.
Brief description of the drawings
Fig. 1 is each modular construction figure of the invention；
Fig. 2 is critical piece outside drawing of the invention；
Fig. 3 is the status architecture schematic diagram that the present invention is monitored to a cable run；
Fig. 4 is the status architecture schematic diagram that the present invention is monitored to a plurality of cable run.
In figure：1- partial discharge sensors；2- high-frequency lines；3- electricals to optical converter；4- optical fiber；5- signals focus on device；6- believes
Number waveform processor；7- transmission processing devices；8- interchangers；9- signals focus on appliance mains switch；11- Partial discharge signal networks
Output interface；31- electrical to optical converter power interfaces；32- analog input interfaces；33- optical fiber output interfaces；41- optical fiber is defeated
Incoming interface；50- photoelectric conversion units；51- waveform selecting units；52- passage switch units；53- phase acquisition units；54- numbers
Word signal controls expanding element；55- analogy signal processing units；56- multiband bandpass filters；57- high-speed a/ds are changed and number
Word signaling control unit；58- control lines；59- netting twines；61- super high-speed As/D conversions and Digital Signals unit；62- partial discharges are believed
Number networking input interface；63- integrated data network output interfaces；64- signal waveform processor power supply interfaces；65- signal waveforms
Processor power supply is switched；66- Waveform Input interfaces；67- control input interfaces；71- light signal transmitters；72- optical signals are received
Device；73- back-end datas process computer；91- power supply indicators；92- signals focus on device power interface；The output of 511- waveforms connects
Mouthful；531- external phase input interfaces；532- Phase-switchings are switched；581- controlled output interfaces.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1-3 are referred to, in the embodiment of the present invention, a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, including office
Put sensor 1, electrical to optical converter 3, signal and focus on device 5 and signal waveform processor 6, wherein partial discharge sensor 1 is by height
Frequency line 2 is connected with electrical to optical converter 3, and it is defeated that the side of electrical to optical converter 3 is provided with electrical to optical converter power interface 31, analog signal
Incoming interface 32 and optical fiber output interface 33, connect partial discharge sensor 1 defeated to the analog signal on electrical to optical converter 3 with high-frequency line 2
Incoming interface 32, wherein electrical to optical converter 3 focus on device 5 and are connected by optical fiber 4 and signal, and signal focuses on device 5 by photoelectricity
Converting unit 50, waveform selecting unit 51, passage switch unit 52, phase acquisition unit 53, Digital Signals expanding element
54th, 57 groups of the conversion of analogy signal processing unit 55, multiband bandpass filter 56 and high-speed a/d and Digital Signals unit
Into and photoelectric conversion unit 50 is connected with waveform selecting unit 51 and passage switch unit 52, passage switch unit 52 and mould
Intend signal processing unit 55 to connect, analogy signal processing unit 55 is connected with multiband bandpass filter 56, the filter of multiband band logical
Ripple device 56 is connected with high-speed a/d conversion with Digital Signals unit 57, and high-speed a/d conversion is with Digital Signals unit 57 again
It is connected with phase acquisition unit 53 and Digital Signals expanding element 54 respectively in addition, the side that signal focuses on device 5 sets
Be equipped with optical fiber input interface 41, side in parallel be provided with waveform output interface 511, external phase input interface 531,
Phase-switching switch 532, signal focuses on appliance mains switch 9 and power supply indicator 91, and the side that signal focuses on device 5 sets
Partial discharge signal networking output interface 11 and controlled output interface 581 are equipped with, side in parallel is provided with signal concentration
Reason device power interface 92, connection optical fiber 4 to the signal of optical fiber output interface 33 on electrical to optical converter 3 focuses on the optical fiber of device 5
Input interface 41, the Partial discharge signal networking output interface 11 that signal focuses on device 5 connects signal waveform treatment by netting twine 59
The Partial discharge signal networking input interface 62 of device 6, the waveform output interface 511 that signal focuses on device 5 connects letter by high-frequency line 2
The Waveform Input interface 66 of number waveform processor 6, the controlled output interface 581 that signal focuses on device 5 is connected by control line 58
The control input interface 67 of signal waveform processor 6 is connect, wherein signal focuses on device 5 by high-frequency line 2, control line 58 and net
Line 59 is connected with signal waveform processor 6, and the super high-speed A/D that is internally provided with of signal waveform processor 6 is changed and data signal
Control unit 61, the side of signal waveform processor 6 is provided with control input interface 67, and side in parallel is provided with letter
Number waveform processor power interface 64 and signal waveform processor power supply switch 65, the side of signal waveform processor 6 is provided with
Partial discharge signal networking input interface 62 and integrated data network output interface 63, the bottom of signal waveform processor 6 is provided with ripple
Shape input interface 66, the integrated data network output interface 63 of signal waveform processor 6 connects optical signal and sends by netting twine 59
Device 71, light signal transmitter 71 connects optical signal receiver 72 by optical fiber 4, and optical signal receiver 72 is after netting twine 59 is connected
Platform data processing computer 73, in specific test, applies the present invention on cable run, as shown in figure 3, tester only needs
Monitored in back-end data treatment computer 73, then the Monitoring Data of Observable whole piece cable.
Refer to shown in Fig. 4, its technical scheme is identical with Fig. 1-3, its different technology point is：Many set analog signal collection
Middle processing formula partial discharge on-Line Monitor Device simultaneously parallel monitoring when, need to be in the integrated data network of each signal waveform processor 6
The netting twine 59 of output interface 63 connects interchanger 8, and interchanger 8 connects light signal transmitter 71 using netting twine 59, and optical signal sends
Device 71 connects optical signal receiver 72 by optical fiber 4, and optical signal receiver 72 connects back-end data and processes computer by netting twine 59
73。
In sum, this Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, by partial discharge sensor 1, electro-optic conversion
Device 3, signal waveform processor 6, signal focus on the setting of device 5, and wherein device obtains signal, passes through by partial discharge sensor 1
High-frequency line 2 transfers signals in electrical to optical converter 3 and electro-optic conversion is carried out to signal, and optical signal is transferred to signal by optical fiber 4
Device 5 is focused on, is focused on inside device 5 in signal, the optical signal that will be collected by photoelectric conversion unit 50 first is changed
Into electric signal, photoelectric conversion unit 50 to each channel acquisition to signal there is two-way to export respectively, interface channel is cut respectively
Unit 52 and waveform selecting unit 51 are changed, selects to monitor the signal of passage by passage switch unit 52, after the completion of selection
Signal transmission carries out signal transacting to analogy signal processing unit 55, and the signal transmission after the treatment of analogy signal processing unit 55 is arrived
Multiband bandpass filter 56 carries out frequency band signals selection, and the signal transmission after the completion of selection is believed to high-speed a/d conversion and numeral
Number control unit 57 is digitized treatment to signal, selects to monitor the waveform of passage by waveform selecting unit 51, passes through
High-frequency line 2 transfers signals to signal waveform processor 6, is believed with numeral by the super high-speed A in signal waveform processor 6/D conversions
Number control unit 61 reduces waveform, and wherein passage switch unit 52, waveform selecting unit 51, multiband bandpass filter 56 be all
By high-speed a/d conversion and the control selections of Digital Signals unit 57, it is achieved thereby that this Optical Fiber Transmission centralization partial discharge is online
Monitoring device can carry out the signal of collection lossless, without deformation electro-optic conversion and individual with unification by fibre-optic transmission system (FOTS) terminal
Unit, while the signal monitoring of different frequency range is carried out to multichannel three-phase monitoring point, can be by reducing waveform, coupled computer is utilized
Time difference technology is analyzed localization process to Partial discharge signal, and simple structure, easy to operate and can improve cable run is tieed up
The characteristics of instant validity, simple operation and stabilization accuracy for protecting.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as the claim involved by limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined
May be appreciated other embodiment.
Claims (2)
1. a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, including partial discharge sensor（1）, electrical to optical converter（3）, signal
Focus on device（5）With signal waveform processor（6）, it is characterised in that：The partial discharge sensor（1）By high-frequency line（2）With
Electrical to optical converter（3）Connection, electrical to optical converter（3）Side be provided with electrical to optical converter power interface（31）, analog signal it is defeated
Incoming interface（32）With optical fiber output interface（33）；The electrical to optical converter（3）By optical fiber（4）Device is focused on signal（5）
Connection, signal focuses on device（5）By photoelectric conversion unit（50）, waveform selecting unit（51）, passage switch unit（52）, phase
Position collecting unit（53）, Digital Signals expanding element（54）, analogy signal processing unit（55）, multiband bandpass filter
（56）With high-speed a/d conversion and Digital Signals unit（57）Composition, signal focuses on device（5）Side be provided with optical fiber
Input interface（41）, side in parallel is provided with waveform output interface（511）, external phase input interface（531）, phase
Position switching switch（532）, signal focus on appliance mains switch（9）And power supply indicator（91）, signal focuses on device（5）'s
Side is provided with Partial discharge signal networking output interface（11）With controlled output interface（581）, side in parallel is provided with
Signal focuses on device power interface（92）；The signal focuses on device（5）By high-frequency line（2）, control line（58）And net
Line（59）With signal waveform processor（6）Connection, signal waveform processor（6）Be internally provided with the conversion of super high-speed A/D and number
Word signaling control unit（61）, signal waveform processor（6）Side be provided with control input interface（67）, it is in parallel
Side is provided with signal waveform processor power supply interface（64）Switched with signal waveform processor power supply（65）, at signal waveform
Reason device（6）Side be provided with Partial discharge signal networking input interface（62）With integrated data network output interface（63）, signal wave
Shape processor（6）Bottom be provided with Waveform Input interface（66）.
2. a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device according to claim 1, it is characterised in that：The light
Electric converting unit（50）Respectively with waveform selecting unit（51）With passage switch unit（52）Connection, passage switch unit（52）With
Analogy signal processing unit（55）Connection, analogy signal processing unit（55）With multiband bandpass filter（56）Connection, multifrequency
Section bandpass filter（56）With high-speed a/d conversion and Digital Signals unit（57）Connection, high-speed a/d conversion and data signal
Control unit（57）Also respectively with phase acquisition unit（53）With Digital Signals expanding element（54）Electrical connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611198879.0A CN106841938A (en) | 2016-12-22 | 2016-12-22 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611198879.0A CN106841938A (en) | 2016-12-22 | 2016-12-22 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161316A (en) * | 2019-06-28 | 2019-08-23 | 宁夏中科天际防雷股份有限公司 | One kind is without external power supply, efficient jamproof smart grounding electrical resistance monitoring instrument |
| CN111343518A (en) * | 2020-02-07 | 2020-06-26 | 云南电网有限责任公司电力科学研究院 | Signal exchange system based on optical fiber equipment transmission |
| CN112394267A (en) * | 2020-12-04 | 2021-02-23 | 国家电网有限公司 | High-speed data acquisition board for cable partial discharge signals |
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| CN106130506A (en) * | 2016-06-13 | 2016-11-16 | 国网上海市电力公司 | A kind of band pass filter means being put on-line monitoring by remote control frequency-selecting enforcement office |
| CN206270454U (en) * | 2016-12-22 | 2017-06-20 | 广州智丰电气科技有限公司 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
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| CN110161316A (en) * | 2019-06-28 | 2019-08-23 | 宁夏中科天际防雷股份有限公司 | One kind is without external power supply, efficient jamproof smart grounding electrical resistance monitoring instrument |
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| CN112394267A (en) * | 2020-12-04 | 2021-02-23 | 国家电网有限公司 | High-speed data acquisition board for cable partial discharge signals |
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Application publication date: 20170613 |