CN206270454U - 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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- CN206270454U CN206270454U CN201621423532.7U CN201621423532U CN206270454U CN 206270454 U CN206270454 U CN 206270454U CN 201621423532 U CN201621423532 U CN 201621423532U CN 206270454 U CN206270454 U CN 206270454U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 38
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000006855 networking Effects 0.000 claims description 8
- 230000011664 signaling Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 22
- 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 9
- 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
- 238000012360 testing method 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
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004088 simulation 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
- 230000005611 electricity 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
- 238000012800 visualization Methods 0.000 description 1
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Abstract
Device and signal waveform processor are focused on the utility model 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 utility model is related to Voltage Cable Lines Construction partial discharge on-line monitoring technique field, and specifically a kind of Optical Fiber Transmission is concentrated
Formula partial discharge 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.
Utility model content
The purpose of this utility model is to provide a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, with structure letter
It is single, easy to operate and can improve to cable run safeguard instant validity, simple operation and stabilization accuracy the characteristics of, with
Solve the problems, such as to be proposed in above-mentioned background technology.
To achieve the above object, the utility model 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 concentrated
Processor and signal waveform processor, the partial discharge sensor are connected by high-frequency line with electrical to optical converter, electrical to optical converter
Side is provided with electrical to optical converter power interface, analog input interface and optical fiber output interface；The electrical to optical converter leads to
Cross optical fiber and focus on device with signal and be connected, signal focuses on device and switched by photoelectric conversion unit, waveform selecting unit, passage
Unit, phase acquisition unit, Digital Signals expanding element, analogy signal processing unit, multiband bandpass filter and height
Fast A/D conversions and Digital Signals unit composition, the side that signal focuses on device is provided with optical fiber input interface, with its phase
Parallel side is provided with waveform output interface, external phase input interface, Phase-switching switch, signal and focuses on device power supply
Switch and power supply indicator, the side that signal focuses on device are provided with Partial discharge signal networking output interface and controlled output connects
Mouthful, side in parallel is provided with signal and focuses on device power interface；The signal focus on device by high-frequency line,
Control line 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 number
Word signaling control unit, the side of signal waveform processor is provided with control input interface, and side in parallel is provided with
Signal waveform processor power supply interface and signal waveform processor power supply are switched, and 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 program of the utility model：The photoelectric conversion unit is cut with waveform selecting unit and passage respectively
Unit connection is changed, passage switch unit is connected with analogy signal processing unit, and analogy signal processing unit is filtered with multiband band logical
Ripple device is connected, and multiband bandpass filter is connected with high-speed a/d conversion with Digital Signals unit, and high-speed a/d is changed and number
Word signaling control unit is also electrically connected with phase acquisition unit and Digital Signals expanding element respectively.
Compared with prior art, the utility model beneficial effect：
This Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, by partial discharge sensor, electrical to optical converter, signal waveform
Processor, signal focus on the setting of device, and wherein device obtains signal by partial discharge sensor, by high-frequency line by signal transmission
Electro-optic conversion is carried out to signal in electrical to optical converter, optical signal focuses on device by Optical Fiber Transmission to signal, in signal collection
Inside middle processor, the optical signal that will be collected by photoelectric conversion unit first is converted into electric signal, photoelectric conversion unit pair
Each channel acquisition to signal there is two-way to export respectively, respectively interface channel switch unit and waveform selecting unit, pass through
The selection of passage switch unit will monitor the signal of passage, and the signal transmission after the completion of selection carries out letter to analogy signal processing unit
Number treatment, analogy signal processing unit treatment after signal transmission carry out frequency band signals selection to multiband bandpass filter, choosing
Signal transmission after the completion of selecting is digitized treatment to signal to high-speed a/d conversion with Digital Signals unit, by ripple
The selection of shape select unit will monitor the waveform of passage, signal waveform processor be transferred signals to by high-frequency line, by signal wave
Super high-speed A/D conversions in shape processor reduce waveform with Digital Signals unit, wherein, passage switch unit, waveform
Select unit, multiband bandpass filter are all changed and Digital Signals unit control selections by high-speed a/d, it is achieved thereby that
This Optical Fiber Transmission centralization partial discharge on-Line Monitor Device can by the signal of collection carry out it is lossless, without deformation electro-optic conversion and by
The system terminal of Optical Fiber Transmission analog optical signal matches somebody with somebody a unification unit, while carrying out the letter of different frequency range to multichannel three-phase monitoring point
Number monitoring, localization process can be analyzed to Partial discharge signal using time difference technology by lossless reduction waveform, coupled computer,
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 office
Put monitoring state, and simple structure, it is easy to operate and can improve cable run is safeguarded instant validity, simple operation and
The characteristics of stabilization accuracy.
Brief description of the drawings
Fig. 1 is each modular construction figure of the present utility model；
Fig. 2 is critical piece outside drawing of the present utility model；
Fig. 3 is the status architecture schematic diagram that the utility model is monitored to a cable run；
Fig. 4 is the status architecture schematic diagram that the utility model 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 utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
Fig. 1-3 are referred to, in the utility model embodiment, a kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device, bag
Include partial discharge sensor 1, electrical to optical converter 3, signal and focus on device 5 and signal waveform processor 6, wherein partial discharge sensor 1 leads to
Cross high-frequency line 2 to be connected with electrical to optical converter 3, the side of electrical to optical converter 3 is provided with electrical to optical converter power interface 31, simulation letter
Number input interface 32 and optical fiber output interface 33, connect partial discharge sensor 1 to the simulation on electrical to optical converter 3 and believe with high-frequency line 2
Number input interface 32, wherein electrical to optical converter 3 focuses on device 5 and is connected by optical fiber 4 and signal, signal focus on device 5 by
Photoelectric conversion unit 50, waveform selecting unit 51, passage switch unit 52, the extension of phase acquisition unit 53, Digital Signals
The conversion of unit 54, analogy signal processing unit 55, multiband bandpass filter 56 and high-speed a/d and Digital Signals unit 57
Composition, and photoelectric conversion unit 50 is connected with waveform selecting unit 51 and passage switch unit 52, passage switch unit 52 and
Analogy signal processing unit 55 is connected, and analogy signal processing unit 55 is connected with multiband bandpass filter 56, multiband band logical
Wave filter 56 is connected with high-speed a/d conversion with Digital Signals unit 57, and high-speed a/d is changed and Digital Signals unit 57
It is connected with phase acquisition unit 53 and Digital Signals expanding element 54 respectively in addition again, signal focuses on the side of device 5
Optical fiber input interface 41 is provided with, side in parallel is provided with waveform output interface 511, external phase input interface
531st, Phase-switching switch 532, signal focuses on appliance mains switch 9 and power supply indicator 91, and signal focuses on the side of device 5
Face is provided with Partial discharge signal networking output interface 11 and controlled output interface 581, and side in parallel is provided with signal collection
Middle processor power supply interface 92, connection optical fiber 4 to the signal of optical fiber output interface 33 on electrical to optical converter 3 focuses on device 5
Optical fiber input interface 41, the Partial discharge signal networking output interface 11 that signal focuses on device 5 connects signal waveform by netting twine 59
The Partial discharge signal networking input interface 62 of processor 6, the waveform output interface 511 that signal focuses on device 5 is connected by high-frequency line 2
The Waveform Input interface 66 of signal waveform processor 6 is connect, the controlled output interface 581 that signal focuses on device 5 passes through control line
The control input interface 67 of 58 connection signal waveform processors 6, wherein signal focus on device 5 by high-frequency line 2, control line 58
It is connected with signal waveform processor 6 with netting twine 59, the super high-speed A/D that is internally provided with of signal waveform processor 6 is changed and numeral
Signaling control unit 61, the side of signal waveform processor 6 is provided with control input interface 67, and side in parallel is set
There are signal waveform processor power supply interface 64 and signal waveform processor power supply switch 65, the side of signal waveform processor 6 sets
Partial discharge signal networking input interface 62 and integrated data network output interface 63 are equipped with, the bottom of signal waveform processor 6 is set
The integrated data network output interface 63 for having Waveform Input interface 66, signal waveform processor 6 connects optical signal by netting twine 59
Transmitter 71, light signal transmitter 71 connects optical signal receiver 72 by optical fiber 4, and optical signal receiver 72 is connected by netting twine 59
Back-end data treatment computer 73 is connect, in specific test, the utility model is applied on cable run, as shown in figure 3, test
Personnel need to only monitor 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 utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit or essential attributes of the present utility model, can in other specific forms realize that this practicality is new
Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new
The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained
All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation
Involved claim.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621423532.7U CN206270454U (en) | 2016-12-22 | 2016-12-22 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621423532.7U CN206270454U (en) | 2016-12-22 | 2016-12-22 | A kind of Optical Fiber Transmission centralization partial discharge on-Line Monitor Device |
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| Publication Number | Publication Date |
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| CN206270454U true CN206270454U (en) | 2017-06-20 |
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| CN201621423532.7U Expired - Fee Related CN206270454U (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 |
|---|---|---|---|---|
| CN106841938A (en) * | 2016-12-22 | 2017-06-13 | 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 |
| CN109444587A (en) * | 2018-11-15 | 2019-03-08 | 国网江苏省电力有限公司电力科学研究院 | Do not have a power failure detection technique reliability calculation method and system based on frequency disribution |
| 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 |
-
2016
- 2016-12-22 CN CN201621423532.7U patent/CN206270454U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841938A (en) * | 2016-12-22 | 2017-06-13 | 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 |
| CN109444587A (en) * | 2018-11-15 | 2019-03-08 | 国网江苏省电力有限公司电力科学研究院 | Do not have a power failure detection technique reliability calculation method and system based on frequency disribution |
| CN109444587B (en) * | 2018-11-15 | 2020-10-16 | 国网江苏省电力有限公司电力科学研究院 | Method and system for calculating reliability of uninterrupted power supply detection technology based on frequency distribution |
| 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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Granted publication date: 20170620 |