CN201229389Y - Cable sheath insulation on-line monitoring device - Google Patents
Cable sheath insulation on-line monitoring device Download PDFInfo
- Publication number
- CN201229389Y CN201229389Y CNU2008201031308U CN200820103130U CN201229389Y CN 201229389 Y CN201229389 Y CN 201229389Y CN U2008201031308 U CNU2008201031308 U CN U2008201031308U CN 200820103130 U CN200820103130 U CN 200820103130U CN 201229389 Y CN201229389 Y CN 201229389Y
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 26
- 238000009413 insulation Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 34
- 230000001012 protector Effects 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000011241 protective layer Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 20
- 238000012544 monitoring process Methods 0.000 description 13
- 230000002547 anomalous effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Abstract
The utility model relates to a monitoring device, in particular to an on-line monitoring device of cable sheath insulation. The structure key points are that the monitoring device comprises a signal detecting device, a central processing unit and a data display device, wherein a signal collecting end of the signal detecting device is connected with an earth end of a cable direct jointing box, a signal output end of the signal detecting device is connected with an input end of the central processing unit, and the data display device is connected with a display output end of the central processing unit. The utility model has the advantages that the device utilizes a principle that after ring current is generated due to earth faults of a metallic coating, current of a direct earth end must generate abnormal changes to detect current of the direct earth end directly. The earth faults of an insulating protective layer or the generation of other earth faults can be effectively judged and discovered, thereby discovering system defects as early as possible, necessary measures are adopted to maintain the cables in time to prevent the cable faults and to prevent the faults from enlarging further, and the power supply reliability is improved, and the device has important significance to the maintenance of cables.
Description
Technical field
The utility model relates to a kind of monitoring device, particularly a kind of cable sheath insulation line monitoring device.
Background technology
The metal sheath of 110～220KV high-pressure cross-linking cable is normally taked the direct ground connection of an end; the other end is by the protector protective ground; as shown in Figure 1; protector is a kind of lightning arrester that has zinc oxide valve plate; valve block is low-resistance when high pressure, be high resistant during low pressure, and protector is only when cable is subjected to high pressure and impacts; valve block is low-resistance, just is grounded.After cable constitutes the interchange transmission circuit, can produce induced potential between cable conductor-heart yearn and the metal sheath, promptly can produce leakage flux during by electric current when cable core, this leakage flux and metal sheath interlinkage can produce induced potential on the metal sheath, under the normal condition, the metal sheath of cable has only single-point grounding-direct earth terminal, although therefore on the metal sheath induced potential is arranged,, just can not form circulation to influence the normal operation of cable owing to do not form the closed-loop path yet.Yet, when cable moves, because range ability is long, any point insulating sheath on it because of various influences cause impaired after, the metal sheath of this respective point just can expose and form earth point, this just causes occurring on the metal sheath more than two even a plurality of earth point, to form the closed-loop path between two even a plurality of earth point, with reference to accompanying drawing 2, because metal sheath has induced potential, and the resistance of metal sheath is very little, so will produce bigger circulation on the closed-loop path.On the one hand, this circulation can produce heat in cable, causes the actual current-carrying capacity of cable to reduce, and consumes big energy; On the other hand, have electric current to flow through around the earth point, cause the soil sex change, increased electrocorrosion, metal sheath will slowly be bored a hole like this, and moisture enters cable thus, and causes cable line fault, has reduced the serviceable life of cable.Because the extra-high-tension cable production cycle is long, cable laying and annex are installed also more complicated, and the back restore cycle of breaking down is long, has a strong impact on power supply reliability.
Summary of the invention
The purpose of this utility model is to provide a kind of cable sheath insulation line monitoring device that prevents cable line fault, improves the reliability of cable power supply according to the deficiencies in the prior art part.
The utility model is realized by following approach:
The cable sheath insulation line monitoring device, its structural feature is, include signal supervisory instrument, central processing unit, data presentation device, the signals collecting end of signal supervisory instrument is connected with the direct ground connection case of cable earth terminal, the signal output part of signal supervisory instrument is connected with the input end of central processing unit, and data presentation device connects in the demonstration output terminal of central processing unit.
Cable is when normal operation, directly earth terminal has certain capacitance current to flow through, if after having metal sheath earth fault to cause producing circulation, directly the electric current of earth terminal certainly leads to ANOMALOUS VARIATIONS, electric current to direct earth terminal detects, and just can realize the monitoring to the insulating sheath situation.The utility model adopts above-mentioned principle, signal supervisory instrument is connected to the direct earth terminal of cable, gather the current data of the direct earth terminal of cable, by central processing unit this image data is handled then, by data presentation device the size of current of gathering is shown at last, after electric current occurs unusually, can judge that earth fault appears in the insulation sheath, the generation of other earth faults is perhaps arranged, thereby in time cable is keeped in repair, to prevent the further expansion of cable fault and fault, improved power supply reliability, be significant for the maintenance of cable.
The utility model can further be specially:
Central processing unit includes transducer and processor, and the signal input part of transducer connects signal supervisory instrument, and the output terminal of transducer connects data presentation device, another output terminal connection processing device of transducer.
Because the signal that signal supervisory instrument collects is a kind of simulating signal, need be converted into digital signal by transducer, shows by data presentation device then, the electric current that is convenient to the direct earth terminal of directly monitoring cable like this changes.
Also include a kind of phase detector, it is plugged in the middle of signal supervisory instrument and the central processing unit, and promptly the input end of phase detector connects signal supervisory instrument, and output terminal connects central processing unit.
Phase detector is a kind of current phase recognizer, because when insulation sheath fault takes place, the capacitance current phase place of the sheath circulation that produces direct earth terminal of cable when normally moving is different, adopt phase detector can make things convenient for the current phase situation of the direct earth terminal of detection streamer, to provide the direct earth terminal of cable detailed electric current situation of change, comprise size and phase data.
Data presentation device includes capacitance current display device and sheath circulation display device, and the two is connected with the demonstration output terminal of central processing unit respectively.
When the cable grounding fault took place, directly two kinds of electric currents can appear in earth terminal, the capacitance current that promptly normal operation just has and the sheath circulation of fault.The two is shown respectively, more detailed electric current situation of change can be provided.
Also include a warning device, it is connected with central processing unit.
Warning device can be an audible alarm, it can also be light alarm, the current data of the detection that receives when central processing unit, the reference data of these data and setting is compared, in case the current data that detects departs from outside the reference data certain limit of setting, will report to the police by warning device.Warning device can long-rangely be realized, to circulate a notice of the unusual of monitoring personnel data, can avoid the monitoring of personnel's twenty four hours like this, causes the waste of manpower resource.
The utility model can also further be specially:
Also include a voltage check device, it is electrically connected with the protector ground connection case of cable, and the signal output part of voltage check device is connected to a treating apparatus, and the output terminal for the treatment of apparatus is connected with a warning device.
Cable is normally in service; protective grounding has voltage to produce; this voltage is directly proportional with the core electric current; if sheath earth fault is arranged; produce sheath circulation; must make the voltage of protector earth terminal produce ANOMALOUS VARIATIONS, therefore this voltage be detected, just can realize monitoring the insulating sheath situation.
The signal that voltage check device collects is handled through treating apparatus, simultaneously, in treating apparatus, include the judgement comparison means, reference value in detected voltage signal and the treating apparatus is compared, when the signal that detects departs from the reference value certain limit, treating apparatus will be reported to the police by warning device, and prompting the cable sheath insulation occurs earth fault takes place.
This is a kind of voltage monitor (comprising voltage check device, treating apparatus and alarm), and this voltage monitor can use as a kind of cable sheath insulation line monitoring device separately.But different with structure with circulation monitoring device (signal supervisory instrument, central processing unit and data presentation device) principle before, because the circulation numerical value that ground connection the causing of cable produces is bigger, the susceptibility of monitoring is also high.Comparatively speaking, less relatively because of the protector change in voltage that earth fault causes, the monitoring susceptibility is low relatively, so voltage monitor is generally as the auxiliary monitoring device of circulation monitoring device.
In sum, advantage of the present utility model is, a kind of cable sheath insulation line monitoring device is provided, utilize metal sheath earth fault to cause producing circulation after, directly the electric current of earth terminal certainly leads to the principle of ANOMALOUS VARIATIONS, and the electric current of direct earth terminal is detected.After finding during monitoring that electric current occurs unusually, can judge effectively and find that earth fault appears in the insulation sheath, the generation of other earth faults is perhaps arranged, thereby find system defect as early as possible, and take the necessary measures, in time cable is keeped in repair, to prevent the further expansion of cable fault and fault, improved power supply reliability, be significant for the maintenance of cable.
Description of drawings
Figure 1 shows that described in the utility model background technology the ground connection synoptic diagram of cable metal sheath in the prior art;
Figure 2 shows that described in the utility model background technology, when breaking down ground connection, produce the principle schematic of closed-loop path in the metal sheath.
Figure 3 shows that in the described cable sheath insulation line monitoring device of the utility model embodiment, utilize fault to produce circulation and the circuit theory diagrams of monitoring;
Figure 4 shows that in the cable sheath insulation line monitoring device described in the utility model, utilize fault to produce electric voltage exception and the circuit theory diagrams of monitoring.
Below in conjunction with embodiment the utility model is described further.
Specific embodiment
Most preferred embodiment:
With reference to accompanying drawing 3, mark is described as follows among the figure:
A: ground connection case protector; B: signal supervisory instrument; C: cable core is to sheath electric capacity; D: protector earth point; E: the direct earth point of metal sheath; F: trouble spot; G: fault ground point; K: phase detector; L: central processing unit; M: sheath circulation display device; N: capacitance current display device; P: warning device; R1, R2: metal sheath resistance; R: trouble spot stake resistance.
The cable sheath insulation line monitoring device, it is a kind of circulation monitoring device, include signal supervisory instrument B, central processing unit L, data presentation device, phase detector K and warning device P, the signals collecting end of signal supervisory instrument B is connected with the direct ground connection case of cable earth terminal, the signal output part of signal supervisory instrument B is connected with the input end of central processing unit L by phase detector K, and data presentation device connects in the demonstration output terminal of central processing unit.Data presentation device includes capacitance current display device N and sheath circulation display device M, and the two is connected with the demonstration output terminal of central processing unit L respectively; Warning device P is a kind of audible-visual annunciator, and its signal output part with central processing unit L is electrically connected.
Cable is when normal operation, directly earth point E has certain capacitance current to flow through, after metal sheath generation earth fault causes producing circulation, directly the electric current of earth point E certainly leads to ANOMALOUS VARIATIONS, signal supervisory instrument B is connected to the direct earth point of cable, gather the current data of the direct earth point of cable, by phase detector K and central processing unit L this image data is handled then, the different size of current that to gather by data presentation device show at last, comprise sheath circulation and capacitance current, when sheath circulation occurring, can judge that earth fault appears in the insulation sheath, the generation of other earth faults is perhaps arranged, in time cable is keeped in repair, to prevent the further expansion of cable fault and fault.
With reference to accompanying drawing 4, each description of symbols is as follows among the figure:
A: ground connection case protector; C: cable core is to sheath electric capacity; D: protector earth point; E: the direct earth point of metal sheath; F: trouble spot; G: fault ground point; Q: voltage measuring apparatus; Y: treating apparatus; U: voltage display device; P: warning device; R1, R2: metal sheath resistance; R: trouble spot stake resistance.
Above-mentioned cable sheath on-Line Monitor Device; it can also be a kind of voltage monitor; include a voltage check device Q; it is electrically connected with the protector ground connection case of cable; the signal output part of voltage check device Q is connected to a treating apparatus Y; the output terminal for the treatment of apparatus Y is connected with a warning device P, and one for the treatment of apparatus Y shows that output terminal is electrically connected with a voltage display device U.
Cable is normally in service; protective grounding has voltage to produce; this voltage is directly proportional with the core electric current; if sheath earth fault is arranged; produce sheath circulation; must make the voltage of protector earth terminal produce ANOMALOUS VARIATIONS, therefore this voltage be detected, also can realize monitoring the insulating sheath situation.Because the circulation numerical value that ground connection the causing of cable produces is bigger, the susceptibility of monitoring is also high.Comparatively speaking, less relatively because of the protector change in voltage that earth fault causes, the monitoring susceptibility is low relatively, so voltage monitor is generally as the auxiliary monitoring device of circulation monitoring device noted earlier.
Above-described each device B, K, L, M, N, P, Q, U, Y all can adopt the commercially available prod, only need carry out the specific aim modification to central processing unit and get final product.For example central processing unit L can adopt the NXP80C51 series monolithic, or the central processing unit of INTEL; M, N can adopt the digital display screen of existing band data line can adopt product of Western Regions production or the like; That phase detector K can adopt is that U.S. SYNERGY produces, the chip model is the phase detector of PDP-201.
It is same as the prior art that the utility model is not stated part.
Claims (6)
1, cable sheath insulation line monitoring device, it is characterized in that, include signal supervisory instrument, central processing unit, data presentation device, the signals collecting end of signal supervisory instrument is connected with the direct ground connection case of cable earth terminal, the signal output part of signal supervisory instrument is connected with the input end of central processing unit, and data presentation device connects in the demonstration output terminal of central processing unit.
2, the cable sheath insulation line monitoring device that is used for according to claim 1, it is characterized in that, central processing unit includes transducer and processor, the signal input part of transducer connects signal supervisory instrument, the output terminal of transducer connects data presentation device, another output terminal connection processing device of transducer.
3, cable sheath insulation line monitoring device according to claim 1, it is characterized in that, also include a kind of phase detector, it is plugged in the middle of signal supervisory instrument and the central processing unit, the input end that is phase detector connects signal supervisory instrument, and output terminal connects central processing unit.
4, cable sheath insulation line monitoring device according to claim 1 is characterized in that, data presentation device includes capacitance current display device and sheath circulation display device, and the two is connected with the demonstration output terminal of central processing unit respectively.
5, cable sheath insulation line monitoring device according to claim 1 is characterized in that, also includes a warning device, and it is connected with the signal output part of central processing unit.
6, cable sheath insulation line monitoring device according to claim 1; it is characterized in that; also include a voltage check device; it is electrically connected with the protector ground connection case of cable; the signal output part of voltage check device is connected to a treating apparatus, and the output terminal for the treatment of apparatus is connected with a warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201031308U CN201229389Y (en) | 2008-07-24 | 2008-07-24 | Cable sheath insulation on-line monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201031308U CN201229389Y (en) | 2008-07-24 | 2008-07-24 | Cable sheath insulation on-line monitoring device |
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| CN201229389Y true CN201229389Y (en) | 2009-04-29 |
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| CNU2008201031308U Expired - Fee Related CN201229389Y (en) | 2008-07-24 | 2008-07-24 | Cable sheath insulation on-line monitoring device |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101986168A (en) * | 2010-10-19 | 2011-03-16 | 郑文秀 | Insulating property monitoring device and method of high-voltage switching apparatus |
| CN102498408A (en) * | 2009-07-30 | 2012-06-13 | 普睿司曼股份公司 | Method and system for monitoring a cable system of an electric power transmission system |
| CN102761075A (en) * | 2011-04-27 | 2012-10-31 | 上海市电力公司 | Transposition device with voltage alarm function |
| CN103245882A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Integrated power failure indication and condition monitoring device |
| CN103698653A (en) * | 2013-12-30 | 2014-04-02 | 国家电网公司 | System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement |
| CN103926493A (en) * | 2014-04-28 | 2014-07-16 | 四川西南不锈钢有限责任公司 | Monitoring method and device for high-voltage single conductor cable sheath protector |
| CN104104029A (en) * | 2014-06-18 | 2014-10-15 | 国家电网公司 | Multifunctional high-voltage cable earthing device capable of monitoring load state |
| CN104113004A (en) * | 2014-06-18 | 2014-10-22 | 国家电网公司 | High-voltage cable protection grounding system transfer device |
| CN104459438A (en) * | 2014-12-05 | 2015-03-25 | 国网浙江奉化市供电公司 | Insulation performance detecting system for metal sheath of power cable |
| CN104483571A (en) * | 2014-12-17 | 2015-04-01 | 安徽泰瑞通达机电设备有限公司 | Cable insulation detection method |
| WO2015161651A1 (en) * | 2014-04-24 | 2015-10-29 | 江苏省电力公司常州供电公司 | Adaptive monitoring method for grounding current of power cable |
| CN105807179A (en) * | 2014-12-31 | 2016-07-27 | 保定华电电气有限公司 | Insulation monitoring device for high-voltage cable sheath |
| CN105988061A (en) * | 2015-02-05 | 2016-10-05 | 云南酷联科技有限公司 | High voltage single core cable protective layer fault locating method |
| CN110133428A (en) * | 2019-06-25 | 2019-08-16 | 武汉伏佳安达电气技术有限公司 | A kind of high voltage power cable comprehensive state amount monitoring technology method |
| CN110412418A (en) * | 2019-07-22 | 2019-11-05 | 国网湖北省电力有限公司电力科学研究院 | Insulating tube type busbar insulation diagnosis and localization method based on earth current measurement |
| CN110702973A (en) * | 2019-10-14 | 2020-01-17 | 四川国信慧通电气技术有限公司 | Online measuring device for induced voltage of cable sheath |
| CN111106457A (en) * | 2019-12-31 | 2020-05-05 | 国网上海市电力公司 | Grounding method and grounding device for 35kV single-core cable |
| CN111856208A (en) * | 2020-07-17 | 2020-10-30 | 山东科汇电力自动化股份有限公司 | Ultrahigh-voltage cable sheath fault point positioning device and method |
| CN112067946A (en) * | 2020-09-17 | 2020-12-11 | 郑州中聖电子科技有限公司 | Cable sheath fault monitoring device and method for broadcasting synchronous signals by multiple Rogowski coils |
| CN112578237A (en) * | 2020-11-30 | 2021-03-30 | 国网北京市电力公司 | Cable insulation fault detection method and device and processor |
| CN117031357A (en) * | 2023-10-08 | 2023-11-10 | 江苏省电力试验研究院有限公司 | Method and device for positioning grounding defect of single-core cable metal sheath with single-end grounded |
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2008
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| CN102498408A (en) * | 2009-07-30 | 2012-06-13 | 普睿司曼股份公司 | Method and system for monitoring a cable system of an electric power transmission system |
| US9276399B2 (en) | 2009-07-30 | 2016-03-01 | Prysmian S.P.A. | Method and system for monitoring a cable system of an electric power transmission system |
| CN101986168A (en) * | 2010-10-19 | 2011-03-16 | 郑文秀 | Insulating property monitoring device and method of high-voltage switching apparatus |
| CN102761075A (en) * | 2011-04-27 | 2012-10-31 | 上海市电力公司 | Transposition device with voltage alarm function |
| CN103245882B (en) * | 2013-04-27 | 2015-11-11 | 国家电网公司 | The power failure instruction of integration and state monitoring apparatus |
| CN103245882A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Integrated power failure indication and condition monitoring device |
| CN103698653A (en) * | 2013-12-30 | 2014-04-02 | 国家电网公司 | System and method for detecting earth fault of sheath of single-core power cable on basis of circulation measurement |
| CN103698653B (en) * | 2013-12-30 | 2016-05-04 | 国家电网公司 | Single-core power cables sheath ground-fault detection system and the method measured based on circulation |
| WO2015161651A1 (en) * | 2014-04-24 | 2015-10-29 | 江苏省电力公司常州供电公司 | Adaptive monitoring method for grounding current of power cable |
| US10352981B2 (en) | 2014-04-24 | 2019-07-16 | Chang Zhou Current Supply Company Of Jiangsu Electric Power Company | Power-cable ground current self-adaptive monitoring method |
| CN103926493A (en) * | 2014-04-28 | 2014-07-16 | 四川西南不锈钢有限责任公司 | Monitoring method and device for high-voltage single conductor cable sheath protector |
| CN104113004A (en) * | 2014-06-18 | 2014-10-22 | 国家电网公司 | High-voltage cable protection grounding system transfer device |
| CN104104029A (en) * | 2014-06-18 | 2014-10-15 | 国家电网公司 | Multifunctional high-voltage cable earthing device capable of monitoring load state |
| CN104113004B (en) * | 2014-06-18 | 2016-08-24 | 国家电网公司 | A kind of high tension cable protective grounding system switching device |
| CN104104029B (en) * | 2014-06-18 | 2016-10-19 | 国家电网公司 | A kind of multifunctional grounded device of high tension cable monitoring load condition |
| CN104459438A (en) * | 2014-12-05 | 2015-03-25 | 国网浙江奉化市供电公司 | Insulation performance detecting system for metal sheath of power cable |
| CN104483571A (en) * | 2014-12-17 | 2015-04-01 | 安徽泰瑞通达机电设备有限公司 | Cable insulation detection method |
| CN104483571B (en) * | 2014-12-17 | 2017-11-10 | 安徽泰瑞通达机电设备有限公司 | Cable insulation detection method |
| CN105807179A (en) * | 2014-12-31 | 2016-07-27 | 保定华电电气有限公司 | Insulation monitoring device for high-voltage cable sheath |
| CN105988061B (en) * | 2015-02-05 | 2019-03-22 | 云南酷联科技有限公司 | A kind of method of high voltage single-core cable protective layer fault location |
| CN105988061A (en) * | 2015-02-05 | 2016-10-05 | 云南酷联科技有限公司 | High voltage single core cable protective layer fault locating method |
| CN110133428A (en) * | 2019-06-25 | 2019-08-16 | 武汉伏佳安达电气技术有限公司 | A kind of high voltage power cable comprehensive state amount monitoring technology method |
| CN110412418A (en) * | 2019-07-22 | 2019-11-05 | 国网湖北省电力有限公司电力科学研究院 | Insulating tube type busbar insulation diagnosis and localization method based on earth current measurement |
| CN110702973A (en) * | 2019-10-14 | 2020-01-17 | 四川国信慧通电气技术有限公司 | Online measuring device for induced voltage of cable sheath |
| CN111106457A (en) * | 2019-12-31 | 2020-05-05 | 国网上海市电力公司 | Grounding method and grounding device for 35kV single-core cable |
| CN111856208A (en) * | 2020-07-17 | 2020-10-30 | 山东科汇电力自动化股份有限公司 | Ultrahigh-voltage cable sheath fault point positioning device and method |
| CN111856208B (en) * | 2020-07-17 | 2023-09-19 | 山东科汇电力自动化股份有限公司 | Device and method for positioning fault point of ultra-high voltage cable sheath |
| CN112067946A (en) * | 2020-09-17 | 2020-12-11 | 郑州中聖电子科技有限公司 | Cable sheath fault monitoring device and method for broadcasting synchronous signals by multiple Rogowski coils |
| CN112578237A (en) * | 2020-11-30 | 2021-03-30 | 国网北京市电力公司 | Cable insulation fault detection method and device and processor |
| CN117031357A (en) * | 2023-10-08 | 2023-11-10 | 江苏省电力试验研究院有限公司 | Method and device for positioning grounding defect of single-core cable metal sheath with single-end grounded |
| CN117031357B (en) * | 2023-10-08 | 2024-01-19 | 江苏省电力试验研究院有限公司 | Method and device for positioning grounding defect of single-core cable metal sheath with single-end grounded |
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