CN103605054A - 10kV crosslinked polyethylene cable water treeing aging detection system - Google Patents
10kV crosslinked polyethylene cable water treeing aging detection system Download PDFInfo
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- CN103605054A CN103605054A CN201310586016.0A CN201310586016A CN103605054A CN 103605054 A CN103605054 A CN 103605054A CN 201310586016 A CN201310586016 A CN 201310586016A CN 103605054 A CN103605054 A CN 103605054A
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Abstract
The invention relates to a 10kV crosslinked polyethylene cable water treeing aging detection system. The 10kV crosslinked polyethylene cable water treeing aging detection system comprises a 10kV crosslinked polyethylene cable to be measured, wherein an external insulation layer of the 10kV crosslinked polyethylene cable to be measured is in grounding connection, a cable core is connected with an input end S0 of a switch module, output ends of the switch module respectively comprise four ends S1, S2, S3 and S4, a direct current power source unit is connected between the S1 end and the ground, the S2 end is in grounding connection, a repeated frequency pulse unit is connected between the S3 and the ground, a circuit formed by connecting an alternating current square wave unit with a detection resistor R serially is connected between the S4 and the ground, a micro current instrument is connected at two ends of the detection resistor R, and the micro current instrument is connected with a computer through a serial bus. The 10kV crosslinked polyethylene cable water treeing aging detection system can completely convert pre-detrapping charges elicited from repeated frequency pulses into a leakage current, so a measurement result can reflect a water treeing aging degree more really.
Description
Technical field
The invention belongs to the aging testing equipment technical field of crosslinking polyethylene-insulated cable insulation, particularly the aging detection system of a kind of 10kV twisted polyethylene cable water tree.
Background technology
Along with the develop rapidly of China's economy, power industry, power supply and electricity consumption enterprise automation are built and transform perfect at development, and people have proposed harsher requirement to power equipment operational reliability.The cable degree of urban distribution network is to weigh the important symbol of urban distribution network Technological Economy level, is also the important means that promotes urban civilization process and improve human habitat.In recent years, power cable with cross-linked polyethylene insulation at home each big city obtains widespread use, and its security also enjoys attention.
The fault progression process of cross-inked polyethylene power cable conventionally need to be longer time, and the result of long-term ageing finally can cause cable breakdown.In the world, Japanese relevant department had once carried out comparatively comprehensively investigation and analysis to the culprit of the 6.6kV electric pressure cross-inked polyethylene power cable of 1963 to 1979.Found that: the cable fault laying in the past for 1970 is more, and that fault population in annex distributes is more even.From service time, move 8 years after cable fault increase sharply.From accident kind, water tree, unaccelerated aging and immersion can account for 50% of total accident ratio.So, can find out, if remove due to initial failure and outside destroy accidents such as terminal, joint are bad, water tree is aging is the main cause that causes cable fault.Nineteen sixty-eight, in direct burial crosslinking polyethylene-insulated cable insulation, find " water tree ", after this people never stopped the correlative study of water tree initiation, growth mechanism, architectural characteristic.In recent years, by the aging crosslinking polyethylene-insulated cable insulation causing of water tree, puncture power outage and be the situation that rises year by year, water tree phenomenon has become the major hidden danger of power cable safe operation, and this forces people constantly to strengthen carrying out water tree and detects and Aging Assessment work.In addition,, along with emerging in large numbers of new technology, particularly relevant insulation Space-charge measuring technique and achievement in research, push water tree mechanism and detection technique to the new stage.
Water tree refers under the crosslinked polyetylene insulated middle prerequisite that has defect, micropore and moisture, due to the electric field distortion at defect or micropore place, can cause the material degradation phenomenon that occurs under lower voltage, causes water tree.The growth of water tree is very slow, but follows water tree growth, and the electric field at water tree tip will seriously distort, and local high electric field intensity finally can cause the most advanced and sophisticated electric branch that produces of water tree.Electric branch forms and can cause cable insulation breakdown in a short time.Cross-inked polyethylene power cable short time after circuit is struck by lightning occurred in electric system punctures power outage, and its reason is the electric branch having at water tree tip in various degree and occurs.When water tree grows into a certain degree, just running into power circuit is struck by lightning, atmospheric over-voltage can be at the larger transient current of the most advanced and sophisticated formation of water tree, the loss of this electric current in branch causes the sharply rising of moisture temperature in water tree micropore even to gasify, and produces larger pressure and can make the crosslinked polyethylene molecular chain rupture at the most advanced and sophisticated place of water tree cause electric branch.Lightning current causes may puncturing at short notice containing water tree cable insulation.The initiation of visible water tree and constantly growth are one of most important reasons of cross-inked polyethylene power cable insulation ag(e)ing, for twisted polyethylene cable, carry out the aging detection of water tree and assessment, for ensureing that power system security is significant.
From micromechanism, crosslinking polyethylene-insulated cable insulation formed water tree in operational process is comprised of a series of moisture micropore of arranging along direction of an electric field substantially, between micropore, can be connected by trickleer minim channel.It is several to a few micron number magnitudes that pore size is about zero point.Fine channel size between micropore is less, can reach below tens nanometers.Under DC Electric Field, water tree shows many special physical characteristicss, also becomes the basis that water tree detects.At present, water tree detects the existing DC component method of method, DC superposition method, dielectric loss method, ground current method, interchange method of superposition, low frequency method of superposition, harmonic component method, electroluminescence method and residual charge method are multiple.Wherein, residual charge method is because device structure is simple, characteristic quantity is obvious, repeated high being subject to of measurement result paid close attention to widely.
Residual charge method has been utilized the nonlinear resistance property of water tree, and, when applied voltage is elevated to certain threshold value, the equivalent resistance of water tree reduces, and now corresponding leakage current values can suddenly increase.Residual charge method is intended to measure the quantity of electric charge of " remnants " that captured by water tree, and assesses according to this degree that water tree is aging.Its implementation is: first, by DC voltage, to cable insulation, charges, now, in space charge meeting injected water branch; Secondly, by conductor ground connection certain hour, shallow-layer charge leakage is fallen; Afterwards, then apply interchange triangular wave, make water tree present nonlinear resistance property, by precision current measuring instrument, measure leakage current waveform simultaneously, through integration, can calculate the remaining quantity of electric charge.This quantity of electric charge is higher, show that cable water tree degree of aging is more serious, otherwise degree of aging is lighter.
Although residual charge method has plurality of advantages, it is that problem is still a lot of in application.Wherein, because the residual charge speed of releasing is slower, cause the problem that Measuring Time is long particularly outstanding.Want to make residual charge method better to play a role, should attempt to develop a kind of residual charge that makes and accelerate the way of leaking.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, and propose the aging detection system of a kind of 10kV twisted polyethylene cable water tree.
The present invention solves its technical matters and takes following technical scheme to realize:
The aging detection system of a kind of 10kV twisted polyethylene cable water tree, this system comprises: 10kV crosslinked polyethylene cable under test, switch module, repetition pulse unit, DC power source unit, ac square wave unit, detect resistance, microcurrent and computer unit, described 10kV crosslinked polyethylene cable under test external insulation ground connection, cable core is connected with switch module input end S0, switch module output terminal is divided into S1, S2, S3 and S4 tetra-ends, between S1 end and ground, be connected DC power source unit, S2 holds direct ground connection, between S3 end and ground, be connected repetition pulse unit, between S4 end and ground, is connected the circuit by ac square wave unit serial connection detection resistance R, detecting resistance R two ends connection microcurrent, microcurrent is connected with computing machine by universal serial bus.
And when the S0 of described switch module and S1 connect, described DC power source unit is in order to 10kV crosslinking polyethylene-insulated cable insulation iunjected charge to be measured, the negative dc voltage V of direct supply
dcsize and application time be: when the 10kV power cable for the time of putting into operation in 1-5 detects, negative dc voltage V
dccan be set to-5kV, application time 5min, for working time at more than 5 years 10kV power cables, negative dc voltage V
dcbe set to-3.5kV, application time is 2min.
And when the S0 of described switch module and S3 connect, described repetition pulse unit applies repetitive frequency pulsed with added DC voltage heteropolarity in order to the cable insulation to iunjected charge; This is repetitive frequency pulsed is action of low-voltage pulse, and for the 5 years time of putting into operation, with interior cable, the frequency of this action of low-voltage pulse was 50-100Hz, and amplitude is 2kV, and application time is 60s; For above cable of the 5 years time of putting into operation, the frequency of this action of low-voltage pulse is 30-50Hz, and amplitude is 1kV, and application time is 60s.
And, when the S0 of described switch module and S4 connect, described ac square wave unit serial connection detects the circuit of resistance R and connects, ac square wave unit, in order to pre-detrapping electric charge is thoroughly discharged, forms leakage current, and delivers to microcurrent by detecting resistance R, for the 5 years time of putting into operation with interior cable, the frequency of the ac square wave of this ac square wave unit output is 150Hz, and amplitude is 12kV, and application time is 60s; For above cable of the 5 years time of putting into operation, the frequency of the ac square wave of this ac square wave power supply output is 150Hz, and amplitude is 8-10kV, and application time is 60s.
And described microcurrent is in order to measure discharging the electric current of electric charge formation, microcurrent adopts Keithley6514 type microcurrent, and during work, parameter is set to sampling rate 0.1s, minimum range shelves (10
-15a).
And, between described switch module and computing machine, be further connected with switch control unit, this switch control unit specifically can adopt MSP430 single-chip microcomputer to implement, this switch control unit is implanted four and is selected a control program, its output terminal is connected with the trigger end of switch module, the input end of this switch control unit is connected with the serial line interface of computing machine, by in computing machine, MSP430 steering logic and delay time being controlled, by switch control unit, DC charging time, repetition pulse predrive, ac square wave activation sequence are controlled.
Advantage of the present invention and good effect are
(1) utilize the space charge burst size relevant to water tree degree of aging as the characteristic parameter of evaluating water tree degree of aging, can intuitively reflect degree of aging.
(2) by the pulse of pre-emphasis complex frequency, can make manyly by Deep Level Traps bound charge, to be discharged, make the characteristic quantity measured more obvious, better to the discrimination of degree of aging, measuring process shortens dramatically.
(3), by applying ac square-wave voltage waveform, can, more thoroughly by being transformed into leakage current by the repetitive frequency pulsed pre-detrapping electric charge inducing, make measurement result reflect more really water tree degree of aging.
(4) upper computer analyzing software is powerful, comprises database and analysis module, can consult historical information and analyze local discharge characteristic from all angles, the row mode of going forward side by side identification.
(5) fully digitalization shows, interface is more directly perceived, succinct, complete function.
(6) compare with existing detection technique, the present invention detects safety, rapid, accurate, is convenient to staff's operation.Water tree aging characteristics is more obvious, is easy to diagnosis.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention;
Fig. 2 is repetition frequency pulse waveform schematic diagram;
Fig. 3 is ac square wave schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention process is further described, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
The aging detection system of a kind of 10kV twisted polyethylene cable water tree, as shown in Figure 1, this system includes: 10kV crosslinked polyethylene cable under test, switch module, repetition pulse unit, DC power source unit, ac square wave unit, detect resistance, microcurrent and computer unit, described 10kV crosslinked polyethylene cable under test external insulation ground connection, cable core is connected with switch module input end S0, switch module output terminal is divided into S1, S2, S3 and S4 tetra-ends, between S1 end and ground, be connected DC power source unit, S2 holds direct ground connection, between S3 end and ground, be connected repetition pulse unit, between S4 end and ground, is connected the circuit by ac square wave unit serial connection detection resistance R, detecting resistance R two ends connection microcurrent, microcurrent is connected with computing machine by universal serial bus.
In specific embodiment of the invention, when the S0 of described switch module and S1 connect, described DC power source unit is in order to 10kV crosslinking polyethylene-insulated cable insulation iunjected charge to be measured, the negative dc voltage V of direct supply
dcsize and application time all according to cable service condition, determine, when for the time of putting into operation, shorter 10kV power cable in 1-5 detects, negative dc voltage V
dccan be set to-5kV, application time 5min, long at more than 5 years 10kV power cables, negative dc voltage V for working time
dccan be set to-3.5kV, application time is 2min.
In specific embodiment of the invention, when the S0 of described switch module and S3 connect, described repetition pulse unit applies repetitive frequency pulsed with added DC voltage heteropolarity in order to the cable insulation to iunjected charge, brings out by water tree trap-charge and discharges; This is repetitive frequency pulsed is action of low-voltage pulse, and as shown in Figure 2, for shorter cable of the time of putting into operation (in 5 years), the frequency of this action of low-voltage pulse is 50-100Hz, and amplitude is 2kV, and application time is 60s; For longer cable of the time of putting into operation (more than 5 years), the frequency of this action of low-voltage pulse is 30-50Hz, and amplitude is 1kV, and application time is 60s.
In specific embodiment of the invention, when the S0 of described switch module and S4 connect, described ac square wave unit serial connection detects the circuit of resistance R and connects, and ac square wave unit, in order to pre-detrapping electric charge is thoroughly discharged, forms leakage current, and deliver to microcurrent by detecting resistance R, as shown in Figure 3, for shorter cable of the time of putting into operation (in 5 years), the frequency of the ac square wave of this ac square wave unit output is 150Hz, amplitude is 12kV, and application time is 60s; For longer cable of the time of putting into operation (more than 5 years), the frequency of the ac square wave of this ac square wave power supply output is 150Hz, and amplitude is 8-10kV, and application time is 60s.
In specific embodiment of the invention, described microcurrent is in order to measure discharging the electric current of electric charge formation, and microcurrent adopts Keithley6514 type microcurrent, and during work, parameter is set to sampling rate 0.1s, minimum range shelves (10
-15a).
In specific embodiment of the invention, described computer-internal is provided with special-purpose Excel-link software and conventional Matlab software, this Excel-link software arranges the sampling rate of microcurrent collection, memory location, finally can to current signal integration, obtain residual charge amount result by Matlab.
In specific embodiment of the invention, between described switch module and computing machine, be further connected with switch control unit, this switch control unit specifically can adopt MSP430 single-chip microcomputer to implement, this switch control unit is implanted four and is selected a control program, its output terminal is connected with the trigger end of switch module, the input end of this switch control unit is connected with the serial line interface of computing machine, by MSP430 steering logic and delay time being controlled in computing machine, by switch control unit to the DC charging time, repetition pulse predrive, ac square wave activation sequence is controlled.
Claims (6)
1. the aging detection system of 10kV twisted polyethylene cable water tree, it is characterized in that this system comprises: 10kV crosslinked polyethylene cable under test, switch module, repetition pulse unit, DC power source unit, ac square wave unit, detect resistance, microcurrent and computer unit, described 10kV crosslinked polyethylene cable under test external insulation ground connection, cable core is connected with switch module input end S0, switch module output terminal is divided into S1, S2, S3 and S4 tetra-ends, between S1 end and ground, be connected DC power source unit, S2 holds direct ground connection, between S3 end and ground, be connected repetition pulse unit, between S4 end and ground, is connected the circuit by ac square wave unit serial connection detection resistance R, detecting resistance R two ends connection microcurrent, microcurrent is connected with computing machine by universal serial bus.
2. the aging detection system of 10kV twisted polyethylene cable water tree according to claim 1, it is characterized in that: when the S0 of described switch module and S1 connect, described DC power source unit is in order to 10kV crosslinking polyethylene-insulated cable insulation iunjected charge to be measured, the negative dc voltage V of direct supply
dcsize and application time be: when the 10kV power cable for the time of putting into operation in 1-5 detects, negative dc voltage V
dccan be set to-5kV, application time 5min, for working time at more than 5 years 10kV power cables, negative dc voltage V
dcbe set to-3.5kV, application time is 2min.
3. the aging detection system of 10kV twisted polyethylene cable water tree according to claim 1, it is characterized in that: when the S0 of described switch module and S3 connect, described repetition pulse unit applies repetitive frequency pulsed with added DC voltage heteropolarity in order to the cable insulation to iunjected charge; This is repetitive frequency pulsed is action of low-voltage pulse, and for the 5 years time of putting into operation, with interior cable, the frequency of this action of low-voltage pulse was 50-100Hz, and amplitude is 2kV, and application time is 60s; For above cable of the 5 years time of putting into operation, the frequency of this action of low-voltage pulse is 30-50Hz, and amplitude is 1kV, and application time is 60s.
4. the aging detection system of 10kV twisted polyethylene cable water tree according to claim 1, it is characterized in that: when the S0 of described switch module and S4 connect, described ac square wave unit serial connection detects the circuit of resistance R and connects, ac square wave unit is in order to thoroughly to discharge pre-detrapping electric charge, form leakage current, and deliver to microcurrent by detecting resistance R, for the 5 years time of putting into operation with interior cable, the frequency of the ac square wave of this ac square wave unit output is 150Hz, amplitude is 12kV, and application time is 60s; For above cable of the 5 years time of putting into operation, the frequency of the ac square wave of this ac square wave power supply output is 150Hz, and amplitude is 8-10kV, and application time is 60s.
5. the aging detection system of 10kV twisted polyethylene cable water tree according to claim 1, it is characterized in that: described microcurrent is in order to measure discharging the electric current of electric charge formation, microcurrent adopts Keithley6514 type microcurrent, during work, parameter is set to sampling rate 0.1s, minimum range shelves (10
-15a).
6. the aging detection system of 10kV twisted polyethylene cable water tree according to claim 1, it is characterized in that: between described switch module and computing machine, be further connected with switch control unit, this switch control unit specifically can adopt MSP430 single-chip microcomputer to implement, this switch control unit is implanted four and is selected a control program, its output terminal is connected with the trigger end of switch module, the input end of this switch control unit is connected with the serial line interface of computing machine, by MSP430 steering logic and delay time being controlled in computing machine, by switch control unit to the DC charging time, repetition pulse predrive, ac square wave activation sequence is controlled.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983902A (en) * | 2014-04-18 | 2014-08-13 | 西安交通大学 | Method for determining cross-linked polyethylene insulation voltage tolerance index of alternating-current cable |
| CN104535870A (en) * | 2015-01-12 | 2015-04-22 | 国家电网公司 | Water treeing degradation detection method for 10kV crosslinked polyethylene power cable |
| CN106233612A (en) * | 2014-04-25 | 2016-12-14 | 东芝三菱电机产业系统株式会社 | Electric rotating machine supply unit, dynamo-electric machine system and electric rotating machine operation method |
| CN106353657A (en) * | 2016-11-28 | 2017-01-25 | 国网福建省电力有限公司 | High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method |
| CN108872815A (en) * | 2018-07-05 | 2018-11-23 | 天津大学 | Direct current cables insulating materials high temperature ageing based on Composite Field assesses device |
| CN109096577A (en) * | 2018-07-05 | 2018-12-28 | 天津大学 | Inhibit the method for crosslinked polyetylene insulated electrical tree aging process based on benzil derivatives |
| CN109375080A (en) * | 2018-12-07 | 2019-02-22 | 华北电力大学（保定） | A kind of the DC earthing electric branch pilot system and method for Programmable and Variable ground resistance |
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
| CN111426909A (en) * | 2020-04-02 | 2020-07-17 | 江苏能电科技有限公司 | Cable aging detection method and device, computer equipment and storage medium |
| CN112147467A (en) * | 2020-08-24 | 2020-12-29 | 天津大学 | Cable insulation branch degradation detection method based on leakage current integral charge |
| CN112198406A (en) * | 2020-10-10 | 2021-01-08 | 广东海洋大学 | Ship cable water tree length estimation method |
| CN114184905A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148959A (en) * | 1997-11-17 | 1999-06-02 | Tokyo Electric Power Co Inc:The | Insulation deterioration diagnostic method of cable |
| JP2004101457A (en) * | 2002-09-12 | 2004-04-02 | Mitsubishi Cable Ind Ltd | Insulation deterioration diagnosing method for power cable |
| CN1834673A (en) * | 2006-03-06 | 2006-09-20 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
| JP2009186334A (en) * | 2008-02-06 | 2009-08-20 | Chubu Electric Power Co Inc | Power cable deterioration position locating method and its device |
| JP2011047766A (en) * | 2009-08-26 | 2011-03-10 | Exsym Corp | Method and device for diagnosing insulation deterioration of power cable |
| JP2011242206A (en) * | 2010-05-17 | 2011-12-01 | Exsym Corp | Insulation deterioration diagnosis method and insulation deterioration diagnosis device of power cable |
-
2013
- 2013-11-20 CN CN201310586016.0A patent/CN103605054B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148959A (en) * | 1997-11-17 | 1999-06-02 | Tokyo Electric Power Co Inc:The | Insulation deterioration diagnostic method of cable |
| JP2004101457A (en) * | 2002-09-12 | 2004-04-02 | Mitsubishi Cable Ind Ltd | Insulation deterioration diagnosing method for power cable |
| CN1834673A (en) * | 2006-03-06 | 2006-09-20 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
| JP2009186334A (en) * | 2008-02-06 | 2009-08-20 | Chubu Electric Power Co Inc | Power cable deterioration position locating method and its device |
| JP2011047766A (en) * | 2009-08-26 | 2011-03-10 | Exsym Corp | Method and device for diagnosing insulation deterioration of power cable |
| JP2011242206A (en) * | 2010-05-17 | 2011-12-01 | Exsym Corp | Insulation deterioration diagnosis method and insulation deterioration diagnosis device of power cable |
Non-Patent Citations (1)
| Title |
|---|
| 郑晓泉等: "检测XLPE电缆绝缘水树老化状态的超低频方波-工频叠加法研究", 《电工电能新技术》, no. 3, 31 December 2000 (2000-12-31), pages 27 - 31 * |
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| CN103983902A (en) * | 2014-04-18 | 2014-08-13 | 西安交通大学 | Method for determining cross-linked polyethylene insulation voltage tolerance index of alternating-current cable |
| CN103983902B (en) * | 2014-04-18 | 2016-05-25 | 西安交通大学 | The method of the crosslinked polyetylene insulated voltage tolerance index of a kind of definite ac cable |
| CN106233612A (en) * | 2014-04-25 | 2016-12-14 | 东芝三菱电机产业系统株式会社 | Electric rotating machine supply unit, dynamo-electric machine system and electric rotating machine operation method |
| CN104535870A (en) * | 2015-01-12 | 2015-04-22 | 国家电网公司 | Water treeing degradation detection method for 10kV crosslinked polyethylene power cable |
| CN106353657A (en) * | 2016-11-28 | 2017-01-25 | 国网福建省电力有限公司 | High-voltage direct current cable partial discharge intelligent monitoring device and monitoring method |
| CN108872815A (en) * | 2018-07-05 | 2018-11-23 | 天津大学 | Direct current cables insulating materials high temperature ageing based on Composite Field assesses device |
| CN109096577A (en) * | 2018-07-05 | 2018-12-28 | 天津大学 | Inhibit the method for crosslinked polyetylene insulated electrical tree aging process based on benzil derivatives |
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
| CN109375080A (en) * | 2018-12-07 | 2019-02-22 | 华北电力大学（保定） | A kind of the DC earthing electric branch pilot system and method for Programmable and Variable ground resistance |
| CN111426909A (en) * | 2020-04-02 | 2020-07-17 | 江苏能电科技有限公司 | Cable aging detection method and device, computer equipment and storage medium |
| CN111426909B (en) * | 2020-04-02 | 2022-04-19 | 江苏能电科技有限公司 | Cable aging detection method and device, computer equipment and storage medium |
| CN112147467A (en) * | 2020-08-24 | 2020-12-29 | 天津大学 | Cable insulation branch degradation detection method based on leakage current integral charge |
| CN112147467B (en) * | 2020-08-24 | 2022-07-01 | 天津大学 | Cable insulation branch degradation detection method based on leakage current integral charge |
| CN112198406A (en) * | 2020-10-10 | 2021-01-08 | 广东海洋大学 | Ship cable water tree length estimation method |
| CN114184905A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
| CN114184905B (en) * | 2021-11-08 | 2022-07-08 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
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