CN108020763A - A kind of monitoring method of direct current submarine cable early stage electricity tree defect - Google Patents
A kind of monitoring method of direct current submarine cable early stage electricity tree defect Download PDFInfo
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- CN108020763A CN108020763A CN201711338365.5A CN201711338365A CN108020763A CN 108020763 A CN108020763 A CN 108020763A CN 201711338365 A CN201711338365 A CN 201711338365A CN 108020763 A CN108020763 A CN 108020763A
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- 230000005611 electricity Effects 0.000 title claims abstract description 80
- 230000007547 defect Effects 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 238000011161 development Methods 0.000 claims abstract description 25
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 15
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 15
- 238000002474 experimental method Methods 0.000 claims description 7
- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000003745 diagnosis Methods 0.000 abstract description 5
- 230000018109 developmental process Effects 0.000 description 21
- 238000001125 extrusion Methods 0.000 description 12
- 238000003825 pressing Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012631 diagnostic technique Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a kind of monitoring method of direct current submarine cable early stage electricity tree defect, which includes：An alternating-current voltage source identical with peculiar frequency during target direct current submarine cable presence electricity tree defect is being accessed on the shielded layer of target direct current submarine cable；Armor voltage magnitude after resonance occurs for the voltage for obtaining alternating-current voltage source and target direct current submarine cable；Armor voltage magnitude is matched with the voltage magnitude in the voltage set prestored, determines target direct current submarine cable with the presence or absence of electricity tree defect and the developing stage of electricity tree defect；The set that voltage set forms for target direct current submarine cable in the corresponding voltage magnitude of electricity tree development of defects different phase.Monitoring method provided by the invention, can monitor direct current submarine cable operation conditions on-line, in the Accurate Diagnosis direct current submarine cable electricity tree development of defects stage, avoid the insulating medium layer of direct current submarine cable breakdown.
Description
Technical field
The present invention relates to high voltage installation to monitor field on-line, more particularly to a kind of direct current submarine cable early stage electricity tree defect
Monitoring method.
Background technology
Relative to UHV AC transmission technique, HVDC Transmission Technology has all in large capacity, high voltage, remote conveying electrical domain
More advantages.And as the rapid development of high voltage dc transmission technology, its application field include：Power System Interconnection, urban electricity supply, island
Power supply and wind power integration etc., the constructions of the engineerings such as especially direct current transportation over strait, Oversea wind power generation be grid-connected in recent years with
And the problems such as large city power supply line corridor and urban urgently to be resolved hurrily, extrusion pressing type crosslinked polyethylene (Cross Linked
Polyethylene, abbreviation XLPE) direct current cables is widely used.
Since extrusion pressing type XLPE direct current cables longtime running is under same polarity of voltage, it is thus possible to which there are space charge
Accumulation.As the continuous accumulation of space charge can cause the distortion of internal field in this cable insulation medium, the highest in medium
Field strength can reach 8 times of extra electric field, easily cause cable insulation dielectric breakdown, especially in forceful electric power field action down space electric charge
Accumulation, can the development of accelerated electric tree branch and ageing process.Therefore, the suppression of space charge and extrusion pressing type XLPE direct current cables failures
On-line monitoring, diagnostic techniques become the key issue of high voltage direct current cable development.For the former, recently as insulating materials and
The exploitation of nanometer technology, adds nano material in dielectric, can effectively solve the space electricity of extrusion pressing type XLPE direct current cables
Lotus problem；For the latter, both at home and abroad also without effective method, particularly in extrusion pressing type XLPE direct current cables electricity tree defect
Early monitoring, in terms of diagnosis.
The content of the invention
The object of the present invention is to provide a kind of monitoring method of direct current submarine cable early stage electricity tree defect, can supervise online
Direct current submarine cable operation conditions is surveyed, in the Accurate Diagnosis direct current submarine cable electricity tree development of defects stage, avoids direct current submarine cable
Insulating medium layer it is breakdown.
To achieve the above object, the present invention provides following scheme：
A kind of monitoring method of direct current submarine cable early stage electricity tree defect, the direct current submarine cable are straight for extrusion pressing type XLPE
Flow submarine cable；The direct current submarine cable from outside to inside successively include armor, liner layer, shielded layer, insulating medium layer with
And core；The both ends of the direct current submarine cable are located at current conversion station, and the center section of the direct current submarine cable is located at seabed；Institute
Stating monitoring method includes：
An alternating-current voltage source is accessed on the shielded layer of target direct current submarine cable；The frequency of the alternating-current voltage source with
Peculiar frequency when the target direct current submarine cable is in the presence of electricity tree defect is identical；
Obtain the armor voltage magnitude of the target direct current submarine cable；The armor voltage magnitude is the exchange
Voltage magnitude after resonance occurs for voltage source and the voltage of the target direct current submarine cable；
The armor voltage magnitude is matched with the voltage magnitude in the voltage set prestored, is determined described
Target direct current submarine cable is with the presence or absence of electricity tree defect and the developing stage of the electricity tree defect；The voltage set is described
Set of the target direct current submarine cable in the corresponding voltage magnitude composition of electricity tree development of defects different phase.
Optionally, it is described to be accessed on the shielded layer of target direct current submarine cable before an alternating-current voltage source, further include：
Determine that the direct current submarine cable of different model has peculiar frequency when electricity sets defect；
Determine that the direct current submarine cable of different model sets the voltage magnitude corresponding to development of defects different phase in electricity,
And by voltage magnitude storage into the corresponding voltage set of the direct current submarine cable of different model.
Optionally, it is described to be accessed on the shielded layer of target direct current submarine cable before an alternating-current voltage source, further include：
Determine the model of the target direct current submarine cable；
According to the model of the target direct current submarine cable, when determining that the target direct current submarine cable has electricity tree defect
Peculiar frequency and voltage set.
Optionally, there is peculiar frequency when electricity sets defect, tool in the direct current submarine cable of the definite different model
Body includes：
The variable resistor electricity tree defect being equivalent in an insulating medium layer, and using in PSCAD softwares
Cable module in frequency phase domain model, establishes the direct current submarine cable model of different model；
The resistance value of the variable resistor is adjusted, and according to the variable resistor after adjustment, to different model
The direct current submarine cable model carries out emulation experiment, when determining that the direct current submarine cable of different model has electricity tree defect
Peculiar frequency.
Optionally, the alternating-current voltage source is sinusoidal ac potential source.
Optionally, the alternating-current voltage source is the sinusoidal ac potential source that voltage magnitude is 0.01V.
The specific embodiment provided according to the present invention, the invention discloses following technique effect：
The present invention provides a kind of monitoring method of direct current submarine cable early stage electricity tree defect, the direct current submarine cable is
Extrusion pressing type XLPE direct current submarine cables；The direct current submarine cable from outside to inside successively include armor, liner layer, shielded layer,
Insulating medium layer and core；The both ends of the direct current submarine cable are located at current conversion station, the pars intermedia of the direct current submarine cable
Divide and be located at seabed；The monitoring method includes：An alternating-current voltage source is accessed on the shielded layer of target direct current submarine cable；Institute
Peculiar frequency when stating the frequency and target direct current submarine cable presence electricity tree defect of alternating-current voltage source is identical；Described in acquisition
The armor voltage magnitude of target direct current submarine cable；The armor voltage magnitude is the alternating-current voltage source and the target
Voltage magnitude after resonance occurs for the voltage of direct current submarine cable；By the armor voltage magnitude and the voltage collection prestored
Voltage magnitude in conjunction is matched, and determines that the target direct current submarine cable is lacked with the presence or absence of electricity tree defect and the electricity tree
Sunken developing stage；The voltage set is the target direct current submarine cable in the corresponding electricity of electricity tree development of defects different phase
The set of pressure amplitude value composition.Therefore, monitoring method provided by the invention, can monitor direct current submarine cable operation conditions on-line,
In the Accurate Diagnosis direct current submarine cable electricity tree development of defects stage, avoid the insulating medium layer of direct current submarine cable breakdown.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow diagram of direct current submarine cable of embodiment of the present invention early stage electricity tree defect inspection method；
Fig. 2 is direct current submarine cable structure of the present invention and electricity tree defect equivalent schematic；
Fig. 3 is emulation experiment schematic diagram of the direct current submarine cable of the present invention in PSCAD softwares；
Fig. 4 is the structure diagram of direct current submarine cable monitoring device of the embodiment of the present invention；
Fig. 5 is direct current submarine cable of embodiment of the present invention electricity tree defect different phase voltage magnitude contrast schematic diagram.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
The object of the present invention is to provide a kind of monitoring method of direct current submarine cable early stage electricity tree defect, can supervise online
Direct current submarine cable operation conditions is surveyed, in the Accurate Diagnosis direct current submarine cable electricity tree development of defects stage, avoids direct current submarine cable
Insulating medium layer it is breakdown.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the flow diagram of direct current submarine cable of embodiment of the present invention early stage electricity tree defect inspection method.Such as Fig. 1 institutes
Show, monitoring method provided by the invention includes：
Step 101：An alternating-current voltage source is accessed on the shielded layer of target direct current submarine cable；The alternating-current voltage source
Peculiar frequency when there is electricity tree defect of frequency and the target direct current submarine cable it is identical.And the electricity tree of different development degree
Defect, the peculiar frequency of target direct current submarine cable is close, admittedly a certain particular value is selected as peculiar frequency.
Fig. 2 is direct current submarine cable of the present invention electricity tree defect equivalent schematic, as shown in Fig. 2, the direct current submarine cable
For extrusion pressing type XLPE direct current submarine cables；The direct current submarine cable includes armor, liner layer, shielding successively from outside to inside
Layer, insulating medium layer and core.
Step 102：Obtain the armor voltage magnitude of the target direct current submarine cable；The armor voltage magnitude is
Voltage magnitude after resonance occurs for the alternating-current voltage source and the voltage of the target direct current submarine cable.
Step 103：The armor voltage magnitude is matched with the voltage magnitude in the voltage set prestored,
Determine the target direct current submarine cable with the presence or absence of electricity tree defect and the developing stage of the electricity tree defect；The voltage collection
It is combined into set of the target direct current submarine cable in the corresponding voltage magnitude composition of electricity tree development of defects different phase.
Wherein, step 103 specifically includes：
When the electricity tree defect of direct current submarine cable is in the initial development stage, voltage magnitude can be very high caused by resonance.Electricity tree
Development of defects must be bigger, and voltage magnitude is lower, so as to judge the development of electricity tree defect according to voltage magnitude.
Preferably, the alternating-current voltage source is sinusoidal ac potential source；The alternating-current voltage source is that voltage magnitude is 0.01V
Sinusoidal ac potential source.
Before step 101 is performed, it is also necessary to do following preparation：
The first step：Determine that the direct current submarine cable of different model has peculiar frequency when electricity sets defect.
Second step：Determine the direct current submarine cable of different model in the electricity corresponding to electricity tree development of defects different phase
Pressure amplitude value, and by voltage magnitude storage into the corresponding voltage set.
3rd step：Determine the model of the target direct current submarine cable；
4th step：According to the model of the target direct current submarine cable, the peculiar of the target direct current submarine cable is determined
Frequency and voltage set.
Wherein, the first step specifically includes：As shown in Fig. 2, the electricity is set defect is equivalent to one in the dielectric
Variable resistor in layer, and using the cable module in frequency phase region model in PSCAD softwares, the direct current for establishing different model is extra large
Bottom cable model；Then the resistance value of the variable resistor is adjusted, and according to the variable resistor after adjustment, to difference
The direct current submarine cable model of model carries out emulation experiment, determines that the direct current submarine cable of different model has electricity and sets
Peculiar frequency during defect.
Since extrusion pressing type XLPE direct current submarine cables are in the case of monopolar operation is chronically at, have a space-charge accumulation can
Can, and then easily trigger and accelerate the insulating medium layer electricity tree defect of extrusion pressing type XLPE direct current submarine cables.The present invention one is to examine
The monitoring process for considering whole extrusion pressing type XLPE direct current submarine cables is in low frequency environments, second, monitoring object of the present invention is early stage
Electricity tree defect, thus it is to simplify simulation process that the electricity tree defect in the insulating medium layer of extrusion pressing type XLPE direct current submarine cables is equivalent
For a variable resistor Rtree。
Fig. 3 is emulation experiment schematic diagram of the direct current submarine cable of the present invention in PSCAD softwares, as shown in figure 3, PSCAD
The cable module of frequency dependence phase domain model is used in simulation software, to simulate the operating mode of direct current submarine cable in reality；
In the case of considering early stage electricity tree defect, electricity tree defect is equivalent to a variable resistor R in insulating medium layertree, use
With the development of simulation electricity tree defect.Cable one end is connected with direct voltage source in Fig. 3, its earthing mode and buried cable are not
Together, the shielded layer of one end of direct current submarine cable is connected with armor direct current and uses the earth-free method of operation；The screen of the other end
Cover layer to insulate with armor, the resistance R that a resistance value is 1k Ω is set therebetween1, a resistance is set between armor and ground
It is worth the resistance R for 0.01 Ω2Represent that it is directly grounded.Certain point in direct current submarine cable sets the equivalent electric of electricity tree defect
Hinder Rtree, respectively with Rtree=106Ω、103Ω、100Ω、10-3Ω carries out emulation experiment, so as to obtain direct current submarine cable
The electricity tree distinctive frequecy characteristic of defect in insulating medium layer.
In implementation process, emulation experiment part specifically includes：Rtree≥106Ω, it is believed that the insulation of direct current submarine cable is situated between
Matter layer is good, and there is no shelf depreciation defect；106Ω≥Rtree≥103Ω, it is believed that shelf depreciation fault location develops rank in the early stage
Section, it is only necessary to periodic detection；103Ω≥Rtree>=10 Ω, it is believed that shelf depreciation defect is in mid-term developing stage, it is necessary to periodically
Monitoring, cycle are one week；10Ω≥Rtree≥10-3Ω, it is believed that shelf depreciation defect is in Rapid development stage, it is necessary to periodically supervise
Survey, the period distances monitored every time shorten；10-3Ω≥Rtree, it is believed that shelf depreciation defect has the possibility of breakdown insulating medium layer,
Its development should be monitored in real time.Its effect is can to obtain the distinctive resonance frequency of direct current cables electricity tree defect of different model
Rate.In addition, it is necessary to illustrate：1. above-mentioned resistance value division is simply theoretic, simulation study is only used for；2. because shelf depreciation lacks
Sunken development speed is different, has very strong randomness, therefore the monitoring cycle in each stage is needed depending on actual conditions.
Fig. 4 is the structure diagram of direct current submarine cable monitoring device of the embodiment of the present invention, as shown in figure 4, being changed in bank base
Flow station direct current submarine cable connector shielded layer be connected an amplitude be 0.01V alternating-current voltage source UC, before its frequency is
Peculiar frequency when the insulating medium layer of the direct current submarine cable obtained in simulation study is in the presence of electricity tree defect is identical, to cause
Resonance.In Practical Project monitoring, to strengthen the effect of resonance easy to observation, often in alternating-current voltage source UCAdd between shielded layer
Add the capacitance of a 15.9 μ F.In addition an oscillograph is connected in the connector of the armor of the same end, recorded in real time in armor
Voltage waveform, and estimated by Beidou satellite system real-time Transmission information to control centre, control centre by spectrum analysis
Electricity tree development of defects situation in the insulating medium layer of direct current submarine cable.
Fig. 5 is direct current submarine cable of embodiment of the present invention electricity tree defect different phase voltage magnitude contrast schematic diagram.Will note
The voltage waveform in armor is recorded, can be seen that after Spectrum Conversion is analyzed and resonance is caused near 100Hz and has an obvious electricity
Pressure amplitude value projection.As shown in figure 5, tentatively judge there is the presence of electricity tree defect in the direct current submarine cable.In subsequent tracking
Found in monitoring, more and more obvious with the lengthening electricity tree defect of time, the voltage magnitude projection near 100Hz is decreased obviously,
Also the change and the development of electricity tree defect for illustrating its voltage magnitude have relation, so as to verify the feasibility of the present invention.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Specific case used herein is set forth the principle of the present invention and embodiment, and above example is said
It is bright to be only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, in specific embodiments and applications there will be changes.In conclusion this specification content is not
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of monitoring method of direct current submarine cable early stage electricity tree defect, it is characterised in that the direct current submarine cable is crowded
Die mould XLPE direct current submarine cables；The direct current submarine cable from outside to inside successively include armor, liner layer, shielded layer, absolutely
Edge dielectric layer and core；The both ends of the direct current submarine cable are located at current conversion station, the center section of the direct current submarine cable
Positioned at seabed；The monitoring method includes：
An alternating-current voltage source is accessed on the shielded layer of target direct current submarine cable；The frequency of the alternating-current voltage source with it is described
Peculiar frequency when target direct current submarine cable is in the presence of electricity tree defect is identical；
Obtain the armor voltage magnitude of the target direct current submarine cable；The armor voltage magnitude is the alternating voltage
Voltage magnitude after resonance occurs for the voltage of source and the target direct current submarine cable；
The armor voltage magnitude is matched with the voltage magnitude in the voltage set prestored, determines the target
Direct current submarine cable is with the presence or absence of electricity tree defect and the developing stage of the electricity tree defect；The voltage set is the target
Set of the direct current submarine cable in the corresponding voltage magnitude composition of electricity tree development of defects different phase.
2. monitoring method according to claim 1, it is characterised in that described on the shielded layer of target direct current submarine cable
Access before an alternating-current voltage source, further include：
Determine that the direct current submarine cable of different model has peculiar frequency when electricity sets defect；
The direct current submarine cable of different model is determined in the voltage magnitude corresponding to electricity tree development of defects different phase, and will
The voltage magnitude storage is into the corresponding voltage set of the direct current submarine cable of different model.
3. monitoring method according to claim 1, it is characterised in that described on the shielded layer of target direct current submarine cable
Access before an alternating-current voltage source, further include：
Determine the model of the target direct current submarine cable；
According to the model of the target direct current submarine cable, the spy when target direct current submarine cable has electricity tree defect is determined
There are frequency and voltage set.
4. monitoring method according to claim 2, it is characterised in that the direct current seabed electricity of the definite different model
There is peculiar frequency during electricity tree defect in cable, specifically include：
The variable resistor electricity tree defect being equivalent in an insulating medium layer, and using frequency in PSCAD softwares
Cable module in phase domain model, establishes the direct current submarine cable model of different model；
The resistance value of the variable resistor is adjusted, and according to the variable resistor after adjustment, to described in different model
Direct current submarine cable model carries out emulation experiment, determines that the direct current submarine cable of different model has spy when electricity sets defect
There is frequency.
5. monitoring method according to claim 1, it is characterised in that the alternating-current voltage source is sinusoidal ac potential source.
6. monitoring method according to claim 5, it is characterised in that the alternating-current voltage source is that voltage magnitude is 0.01V
Sinusoidal ac potential source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711338365.5A CN108020763B (en) | 2017-12-14 | 2017-12-14 | Method for monitoring early-stage electric tree defects of direct-current submarine cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711338365.5A CN108020763B (en) | 2017-12-14 | 2017-12-14 | Method for monitoring early-stage electric tree defects of direct-current submarine cable |
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| CN108020763A true CN108020763A (en) | 2018-05-11 |
| CN108020763B CN108020763B (en) | 2020-02-11 |
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| CN201711338365.5A Expired - Fee Related CN108020763B (en) | 2017-12-14 | 2017-12-14 | Method for monitoring early-stage electric tree defects of direct-current submarine cable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057816A (en) * | 2019-03-20 | 2019-07-26 | 天津大学 | The appraisal procedure of insulating materials senile experiment device based on electro thermal coupling field |
| CN111060788A (en) * | 2019-12-20 | 2020-04-24 | 国网北京市电力公司 | Method and device for analyzing cable insulation defect, storage medium and processor |
| CN114217175A (en) * | 2021-07-27 | 2022-03-22 | 国网河北省电力有限公司电力科学研究院 | Power cable electric tree defect detection method and device and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114217175A (en) * | 2021-07-27 | 2022-03-22 | 国网河北省电力有限公司电力科学研究院 | Power cable electric tree defect detection method and device and terminal |
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| Publication number | Publication date |
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| CN108020763B (en) | 2020-02-11 |
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