CN104122465B - Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient - Google Patents
Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient Download PDFInfo
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- CN104122465B CN104122465B CN201410350428.9A CN201410350428A CN104122465B CN 104122465 B CN104122465 B CN 104122465B CN 201410350428 A CN201410350428 A CN 201410350428A CN 104122465 B CN104122465 B CN 104122465B
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Abstract
The invention discloses a device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient. The device comprises an upper electrode, a lower electrode, a first constant temperature source, a second constant temperature source, a high-voltage direct-current power supply and a circuit protection device, wherein the upper electrode is used for being in contact with one side of each aged piece-shaped sample; the lower electrode is used for being in contact with the other side of each tested insulating material piece-shaped sample; the first constant temperature source is used for conducting the temperature to the upper electrode; the second constant temperature source is used for conducting the temperature to the lower electrode; the high-voltage direct-current power supply is used for controlling voltage of the upper electrode; and the circuit protection device is used for protecting a device in a circuit and the piece-shaped samples having not undergone breakdown. The device and the method are used for performing united aging on the multi-group piece-shaped samples under a high-voltage direct-current electric field and a temperature gradient field.
Description
Technical field
The invention belongs to the aging technical field of insulating material of polymer, relate to a kind of at high voltage DC power equipment
Middle insulant aging method under conditions of electric field has temperature difference with material internal, is specifically related to one many
Group sheet specimens high voltage with combine aging equipment and method under thermograde.
Background technology
Insulant in power equipment is for a long time by electricity, heat integration effect, especially under DC electric field, directly
The temperature gradient effect that space charge effect under stream voltage is worked in coordination with, has a strong impact on the D.C. isolation life-time service longevity
Life.For the long-term reliability of researching DC insulation, the most usual method is by electric-thermal associating
Degradation, but at present test to be all confined to single temperature (room temperature or high temperature) old with combining of DC electric field
Change；Or owing to electrode edge effect applying DC electric field is relatively low；Or for eliminating electrode edge effect, sample is soaked
Carry out degradation in entering insulating oil, but oil can interact with insulant during long-term ageing；
Or reduce aging test product number for improving electrode sealing reliability, increase the test period.So it is existing aging
Temp. difference field is there is (such as direct current plastics electricity in techniques or methods in can not simulating the Electric Power Equipment Insulation in actual motion
Cable), high-volume test product can not be realized under high field intensity, air ambient, carry out the situation of degradation simultaneously, give
In simulation actual motion, the research of insulant is made troubles.
As it is shown in figure 1, be the structured flowchart of existing aging method and device, this aging method and device include:
High-voltage DC power supply 101, upper electrode 102, bottom electrode 103, sheet specimens 104, fuse 105, circuit
Protection device forms.
Insulant in direct current power equipment has work under temperature difference acts on jointly with DC electric field inside and outside
Make, and insulant resistivity has non-linear relation with temperature, therefore the electricity in true DC equipment insulation
Field distribution may have bigger difference with the Electric Field Distribution under conventional homogenization temperature, and this can directly affect insulation
The ageing results of dielectric substance.
Additionally, existing ageing system will stop when having a piece of puncturing in aging multi-disc sheet specimens
Only work, this can largely effect on the efficiency of burin-in process.
Summary of the invention
It is an object of the invention to solve the problems referred to above, it is provided that a kind of many group sheet specimens are at voltage and temperature ladder
Associating aging equipment under Du and method, this device in order under the common effect of electric field and temperature gradient field,
The sheet specimens of insulant is carried out long-term ageing.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of many group sheet specimens voltage with combine aging equipment, including high voltage direct current under thermograde
Source, upper electrode and bottom electrode；Upper electrode is connected to the outfan of high-voltage DC power supply, high-voltage DC power supply
Earth terminal and bottom electrode unify ground connection；Sheet specimens is added between upper electrode and bottom electrode；Upper electrode with
Connect between high voltage direct current source output terminal and have a circuit protection device, and connect respectively on upper electrode and bottom electrode
For regulating upper electrode and the temperature-adjusting device of bottom electrode temperature.
Described temperature-adjusting device includes high temperature constant temperature circulation bath and cryogenic thermostat circulation bath；Work as high temperature constant temperature
When circulation bath is connected with upper electrode, cryogenic thermostat circulation bath is connected with bottom electrode；When high temperature constant temperature circulation bath with
When bottom electrode is connected, cryogenic thermostat circulation bath is connected with upper electrode.
Described upper electrode includes the upper electrode casing of the equal opening in top and bottom, and upper electrode casing offers
The upper electrode liquid inlet port being connected with high temperature constant temperature circulation bath or cryogenic thermostat circulation bath and upper electrode liquid
Export mouth；Being provided with some upper electrode groups in upper electrode casing, upper electrode group is by being arranged at upper electrode casing
The voltage lead-in of side is connected with circuit protection device；The lower end of upper electrode casing and the lower end of upper electrode group
Concordant, around it is filled with epoxy resin as upper electrode group and upper electrode box bottom, and the end of epoxy resin
Portion is concordant with the bottom of upper electrode group and upper electrode casing, and the top of upper electrode casing is provided with for powering on
The upper electrode that pole seals seals lid.
Described upper electrode seals lid and is provided with seal with upper electrode that lid matches upper between upper electrode casing
Electrode O-ring seal.
Described upper electrode is sealed lid and is fixed on upper electrode casing by upper electrode package screw.
Described bottom electrode includes open-topped bottom electrode casing, and bottom electrode passes through bottom electrode casing and high pressure
The earth terminal of DC source is unified ground connection after being connected；Offer on bottom electrode casing with high temperature constant temperature circulation bath or
The bottom electrode liquid inlet port and bottom electrode liquid export mouth being connected is bathed in cryogenic thermostat circulation；Bottom electrode casing
Inside being provided with the bottom electrode group that some and upper electrode group is corresponding, the top of bottom electrode casing is provided with for inciting somebody to action
The bottom electrode that bottom electrode seals seals lid；The upper end of bottom electrode group is fixed on bottom electrode sealing and covers, and lower electricity
The end of pole group is stretched out bottom electrode and is sealed lid；The bottom of bottom electrode group is provided with spring, and one end of spring is fixed
In the bottom of bottom electrode casing, the other end is fixed on the lower surface of bottom electrode group.
Described bottom electrode seals lid and matches down with being provided with between bottom electrode casing to seal to cover with bottom electrode
Electrode O-ring seal.
Described bottom electrode is sealed lid and is fixed on bottom electrode casing by bottom electrode encapsulation screw.
Described circuit protection device includes and the upper the most some fuses of electrode group；The one of fuse
End is connected with the outfan of high-voltage DC power supply, and the other end is connected with corresponding upper electrode group.
A kind of many group sheet specimens voltage with combine aging method under thermograde, comprise the following steps:
1) sheet specimens is put between upper electrode and bottom electrode, and two neither produce between many group sheet specimens
Overlapping；
2) high temperature constant temperature circulation bath and the temperature of cryogenic thermostat circulation bath are set, and allow liquid therein be flowed into
Upper electrode, with bottom electrode, forms constant temperature bath；
3) after constant temperature bath makes the temperature of upper electrode and bottom electrode reach the design temperature of constant temperature bath, height is utilized
Pressure DC source applies voltage；
4) if sheet specimens all punctures, then need the output voltage of high-voltage DC power supply is adjusted 0,
And electrode is carried out discharge process, and then the sheet specimens punctured is changed, repeats step 1) to step
Rapid 3)；
5) to be aging complete after, then need the output voltage of high-voltage DC power supply is adjusted 0, and electrode entered
Row discharge process, then takes out sheet specimens.
Compared with prior art, the method have the advantages that
The present invention is by providing temperature gradient field and electric field for multi-disc lamellar insulant simultaneously, it is achieved many groups
Aging under temperature gradient field, high voltage electric field act on jointly of insulant lamellar sample.Thermograde is passed through
High and low temperature circulation bath controls the temperature of upper/lower electrode and realizes.By the invention it is possible to research insulant
Under different temperatures gradient, carry out under high electric field intensity effect aging after the research of various performances.
Further, in the present invention, electrode can apply same voltage to multi-disc insulation flaky material simultaneously；
Bottom electrode can provide earth terminal for multi-disc insulation flaky material simultaneously, and electrode is cased with sealing ring, to prevent from following
Ring liquid is from gap leakage；Circuit protection device: when in ageing process, all carries out aging sheet specimens
Intact sheet specimens can be allowed to proceed when all not puncturing aging.
Further, the bottom electrode of the present invention bottom electrode that can appropriate freely move up and down with spring, make
There is identical closeness of contact between sheet specimens and electrode that thickness there are differences, be aging lamellar for all
Sample provides reliable ground.
Further, the present invention, for preventing electrode edge from producing creeping discharge and corona, uses in upper electrode
Epoxy fixes multi-group electrode and high voltage cable, prevents electrode edge from producing creeping discharge and avoiding electrode and high pressure
The junction of cable produces corona.
Further, the present invention, in ageing process, all carry out aging sheet specimens and the most all occurs
Intact sheet specimens can be allowed to proceed when puncturing aging, when all aging sheet specimens puncture,
Degradation is just made to stop.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of existing DC voltage aging equipment；
Fig. 2 is the structured flowchart of the DC voltage aging equipment of the embodiment of the present invention 1；
Fig. 3 is composition and the assembling design sketch of electrode in the present invention；
Fig. 4 is composition and the assembling design sketch of bottom electrode of the present invention；
Fig. 5 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, be fully described by, it is clear that described embodiment be only a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Seeing Fig. 2, the present invention many groups sheet specimens is at high voltage and the aging equipment of combining under thermograde, bag
Include high-voltage DC power supply 101, upper electrode 102 and bottom electrode 103；Upper electrode 102 is connected to HVDC
On the outfan of power supply 101, the earth terminal of high-voltage DC power supply 101 and the equal ground connection of bottom electrode 103；Power on
Pretend there is sheet specimens 104 between pole 102 and bottom electrode 103；Upper electrode 102 and high-voltage DC power supply 101
Connect between outfan and have a circuit protection device 205, and connect use respectively on upper electrode 102 and bottom electrode 103
In the upper electrode 102 of regulation and the temperature-adjusting device of bottom electrode 103 temperature.Temperature-adjusting device includes high temperature
Constant temperature circulating bath 201 and cryogenic thermostat circulation bath 202；When high temperature constant temperature circulation bath 201 and upper electrode 102 phase
Lian Shi, cryogenic thermostat circulation bath 202 is connected with bottom electrode 103；When high temperature constant temperature circulation bath 201 and lower electricity
When pole 103 is connected, cryogenic thermostat circulation bath 202 is connected with upper electrode 102.As it is shown in figure 5, circuit is protected
Protection unit 205 includes and the upper the most some fuses of electrode group 304 206；One end of fuse 206
Being connected with the outfan of high-voltage DC power supply 101, the other end is connected with corresponding upper electrode group 304.
As it is shown on figure 3, upper electrode 102 includes the upper electrode casing 307 of the equal opening in top and bottom, upper electrode
Offer on casing 307 and powering on that high temperature constant temperature circulation bath 201 or cryogenic thermostat circulation bath 202 are connected
Pole liquid inlet port 301 and upper electrode liquid export mouth 302；It is provided with some powering in upper electrode casing 307
Pole group 304, upper electrode group 304 is by being arranged at voltage lead-in 305 and the electricity of upper electrode casing 307 side
Line protection device 205 is connected；The lower end of upper electrode casing 307 is concordant with the lower end of upper electrode group 304, week
Enclose be filled with epoxy resin as upper electrode group 304 and upper electrode casing 307 bottom, and the end of epoxy resin
Portion is concordant with the bottom of upper electrode group 304 and upper electrode casing 307, and the top of upper electrode casing 307 is arranged
The upper electrode for being sealed by upper electrode 102 is had to seal lid 308.Upper electrode seals lid 308 and upper electrode casing
It is provided with between 307 and seals, with upper electrode, the upper electrode O-ring seal 303 that lid 308 matches.Upper electrode seals
Lid 308 is fixed on upper electrode casing 307 by upper electrode package screw 309, thus forms airtight containing
There is electrode casing in the hollow of many group high-field electrode systems.
As shown in Figure 4, bottom electrode 103 includes open-topped bottom electrode casing 406, and bottom electrode 103 passes through
Bottom electrode casing 406 be connected with the earth terminal of high-voltage DC power supply 101 after ground connection；On bottom electrode casing 406
Offer the bottom electrode liquid being connected with high temperature constant temperature circulation bath 201 or cryogenic thermostat circulation bath 202 to import
Mouth 401 and bottom electrode liquid export mouth 402；Some and upper electrode group 304 it is provided with in bottom electrode casing 406
Corresponding bottom electrode group 404, the top of bottom electrode casing 406 is provided with for being sealed by bottom electrode 103
Bottom electrode seals lid 407；The upper end of bottom electrode group 404 is fixed on bottom electrode and seals on lid 407, and bottom electrode
The end of group 404 is stretched out bottom electrode and is sealed lid 407；The bottom of bottom electrode group 404 is provided with spring 405, bullet
One end of spring 405 is fixed on the bottom of bottom electrode casing 406, and the other end is fixed on bottom electrode group 404 times
On end face.Bottom electrode seals to be provided with between lid 407 and bottom electrode casing 406 and seals lid 407 with bottom electrode
The bottom electrode O-ring seal 403 matched.Bottom electrode is sealed lid 407 and is fixed by bottom electrode encapsulation screw 408
On bottom electrode casing 406.
The invention also discloses a kind of many group sheet specimens voltage with combine aging method under thermograde,
Comprise the following steps:
1) sheet specimens is put between upper electrode and bottom electrode, and two neither produce between many group sheet specimens
Overlapping；
2) high temperature constant temperature circulation bath and the temperature of cryogenic thermostat circulation bath are set, and allow liquid therein be flowed into
Upper electrode, with bottom electrode, forms constant temperature bath；
3) after constant temperature bath makes the temperature of upper electrode and bottom electrode reach the design temperature of constant temperature bath, height is utilized
Pressure DC source applies voltage；
4) if sheet specimens all punctures, then need the output voltage of high-voltage DC power supply is adjusted 0,
And electrode is carried out discharge process, and then the sheet specimens punctured is changed, repeats step 1) to step
Rapid 3)；
5) to be aging complete after, then need the output voltage of high-voltage DC power supply is adjusted 0, and electrode entered
Row discharge process, then takes out sheet specimens.
The principle of the present invention
Electrode in the present invention, is aging one of them surface of sheet specimens for contact；Bottom electrode, is used for
Contact is aging another surface of sheet specimens；First constant temperature source, for controlling the temperature of described upper electrode；
Second constant temperature source, for controlling the temperature of described bottom electrode；High-voltage DC power supply, for described
Electrode applies DC voltage, and high-voltage DC power supply is in order to control polarity of voltage and the amplitude of upper electrode；Circuit is protected
Protection unit, for the equipment in protection circuit make other not puncture when sheet specimens the most all punctures
Sheet specimens proceed aging, when sheet specimens all punctures the equipment in protection circuit.High temperature
The liquid with the first steady temperature is imported described by constant temperature circulating bath by the liquid inlet port of described upper electrode
Liquid containing chamber, and enter high temperature constant temperature circulation bath by the liquid export mouth of described upper electrode, complete
The circulation of liquid；Cryogenic thermostat circulation bath will have the liquid liquid by described bottom electrode of the second steady temperature
Liquid containing chamber described in the importing of body introducing port, and enter cryogenic thermostat circulation by described liquid export mouth
Bath, completes the circulation of liquid；Circuit protection device is used for being aging when sheet specimens the most all punctures to be made
The most breakdown sheet specimens continues the equipment in aging and protection circuit, or complete when be aging sheet specimens
Equipment in protection circuit when portion punctures.
Also high temperature constant temperature bath can be connected with bottom electrode, to bottom electrode transmission high-temp in the present invention；And by low
Temperature constant temperature bath is connected with upper electrode, upwards electrode conduction low temperature.Then temperature gradient field and high-tension electricity are carried out
Insulant under common effect aging.
Also the temperature of high temperature constant temperature bath and cryogenic thermostat bath can be adjusted in the present invention, make to be conducted to power on
The temperature of pole is equal to the temperature being conducted to bottom electrode.Then carry out homogenization temperature field and high voltage electric field acts on jointly
Under insulant aging.
The insulant lamellar sample that the present invention is capable of under temperature gradient field, high voltage electric field act on jointly
Aging.Thermograde controls to be aging the upper and lower of insulant lamellar sample by high and low temperature circulation bath respectively
Electrode temperature realizes.
Above content is only the technological thought that the present invention is described, it is impossible to limit protection scope of the present invention with this,
Every technological thought proposed according to the present invention, any change done on the basis of technical scheme, each fall within
Within the protection domain of claims of the present invention.
Claims (8)
1. organize one kind more sheet specimens voltage with combine aging equipment under thermograde, it is characterised in that:
Including high-voltage DC power supply (101), upper electrode (102) and bottom electrode (103)；Upper electrode (102)
It is connected to the outfan of high-voltage DC power supply (101), the earth terminal of high-voltage DC power supply (101) and lower electricity
The unified ground connection in pole (103)；Sheet specimens (104) is added between upper electrode (102) and bottom electrode (103)；
It is connected between upper electrode (102) with high-voltage DC power supply (101) outfan and has circuit protection device (205),
And be connected to respectively regulate electrode (102) and bottom electrode on upper electrode (102) and bottom electrode (103)
(103) temperature-adjusting device of temperature；
Described temperature-adjusting device includes high temperature constant temperature circulation bath (201) and cryogenic thermostat circulation bath (202)；
When high temperature constant temperature circulation bath (201) be connected with upper electrode (102) time, cryogenic thermostat circulation bathe (202) and
Bottom electrode (103) is connected；When high temperature constant temperature circulation bath (201) is connected with bottom electrode (103), low temperature
Constant temperature circulating bath (202) is connected with upper electrode (102)；
Described upper electrode (102) includes the upper electrode casing (307) of the equal opening in top and bottom, upper electrode
Offer on casing (307) and be connected with high temperature constant temperature circulation bath (201) or cryogenic thermostat circulation bath (202)
Logical upper electrode liquid inlet port (301) and upper electrode liquid export mouth (302)；Upper electrode casing (307)
Inside being provided with some upper electrode groups (304), upper electrode group (304) is by being arranged at upper electrode casing (307)
The voltage lead-in (305) of side is connected with circuit protection device (205)；Upper electrode casing (307)
Lower end is concordant with the lower end of upper electrode group (304), is around filled with epoxy resin as upper electrode group (304)
And upper electrode casing (307) bottom, and the bottom of epoxy resin and upper electrode group (304) and upper electrode case
The bottom of body (307) is concordant, and the top of upper electrode casing (307) is provided with for by upper electrode (102)
The upper electrode sealed seals lid (308).
Many group sheet specimens the most according to claim 1 voltage with combine aging dress under thermograde
Put, it is characterised in that: described upper electrode seals and arranges between lid (308) and upper electrode casing (307)
Have and seal, with upper electrode, the upper electrode O-ring seal (303) that lid (308) matches.
Many group sheet specimens the most according to claim 2 voltage with combine aging dress under thermograde
Put, it is characterised in that: it is solid by upper electrode package screw (309) that described upper electrode seals lid (308)
It is scheduled on electrode casing (307).
Many group sheet specimens the most according to claim 1 voltage with combine aging dress under thermograde
Put, it is characterised in that: described bottom electrode (103) includes open-topped bottom electrode casing (406), under
Electrode (103) is united after being connected with the earth terminal of high-voltage DC power supply (101) by bottom electrode casing (406)
One ground connection；Offer on bottom electrode casing (406) and follow with high temperature constant temperature circulation bath (201) or cryogenic thermostat
Ring bathes bottom electrode liquid inlet port (401) and bottom electrode liquid export mouth (402) that (202) are connected；
The bottom electrode group (404) that some and upper electrode group (304) is corresponding it is provided with in bottom electrode casing (406),
The top of bottom electrode casing (406) is provided with the bottom electrode for being sealed by bottom electrode (103) and seals lid (407)；
The upper end of bottom electrode group (404) is fixed on bottom electrode and seals on lid (407), and bottom electrode group (404)
End is stretched out bottom electrode and is sealed lid (407)；The bottom of bottom electrode group (404) is provided with spring (405), bullet
One end of spring (405) is fixed on the bottom of bottom electrode casing (406), and the other end is fixed on bottom electrode group (404)
Lower surface on.
Many group sheet specimens the most according to claim 4 voltage with combine aging dress under thermograde
Put, it is characterised in that: described bottom electrode seals and arranges between lid (407) and bottom electrode casing (406)
Have and seal, with bottom electrode, the bottom electrode O-ring seal (403) that lid (407) matches.
Many group sheet specimens the most according to claim 5 voltage with combine aging dress under thermograde
Put, it is characterised in that: it is solid by bottom electrode encapsulation screw (408) that described bottom electrode seals lid (407)
It is scheduled on bottom electrode casing (406).
7. according to the many groups sheet specimens described in claim 1 to 6 any one under voltage with thermograde
Associating aging equipment, it is characterised in that: described circuit protection device (205) includes and upper electrode group (304)
The most some fuses (206)；One end of fuse (206) and high-voltage DC power supply (101)
Outfan be connected, the other end and corresponding upper electrode group (304) are connected.
8. as described in claim 1 to 6 any one many groups sheet specimens of device in voltage and thermograde
Under associating aging method, it is characterised in that comprise the following steps:
1) sheet specimens is put between upper electrode and bottom electrode, and two neither produce between many group sheet specimens
Overlapping；
2) high temperature constant temperature circulation bath and the temperature of cryogenic thermostat circulation bath are set, and allow liquid therein be flowed into
Upper electrode, with bottom electrode, forms constant temperature bath；
3) after constant temperature bath makes the temperature of upper electrode and bottom electrode reach the design temperature of constant temperature bath, height is utilized
Pressure DC source applies voltage；
4) if sheet specimens all punctures, then need the output voltage of high-voltage DC power supply is adjusted 0,
And electrode is carried out discharge process, and then the sheet specimens punctured is changed, repeats step 1) to step
Rapid 3)；
5) to be aging complete after, then need the output voltage of high-voltage DC power supply is adjusted 0, and electrode entered
Row discharge process, then takes out sheet specimens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410350428.9A CN104122465B (en) | 2014-07-22 | 2014-07-22 | Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410350428.9A CN104122465B (en) | 2014-07-22 | 2014-07-22 | Device and method for united aging of multi-group piece-shaped samples under voltage temperature gradient |
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| Publication Number | Publication Date |
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| CN104122465A CN104122465A (en) | 2014-10-29 |
| CN104122465B true CN104122465B (en) | 2017-01-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111665425A (en) * | 2020-07-09 | 2020-09-15 | 国网山西省电力公司电力科学研究院 | Device and method for rapidly detecting tree resistance of crosslinked polyethylene cable |
| CN111665426A (en) * | 2020-07-09 | 2020-09-15 | 国网山西省电力公司电力科学研究院 | Device and method for rapidly detecting water tree resistance of crosslinked polyethylene cable |
| CN112147425A (en) * | 2020-08-27 | 2020-12-29 | 西安交通大学 | Low-temperature space charge measuring system |
| CN116430151B (en) * | 2023-04-25 | 2023-10-20 | 哈尔滨理工大学 | Preparation method of electrode system for electrical aging test of multiple samples |
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| CN102759690A (en) * | 2012-06-25 | 2012-10-31 | 中国电力科学研究院 | Method for judging insulation aging degrees of alternating current (AC) cables |
| CN103278752A (en) * | 2013-04-28 | 2013-09-04 | 西安交通大学 | Corona aging acceleration device and method for polymer insulating material |
| CN103439639A (en) * | 2013-09-06 | 2013-12-11 | 天津学子电力设备科技有限公司 | XLPE cable insulation aging state assessment method |
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| CN102759690A (en) * | 2012-06-25 | 2012-10-31 | 中国电力科学研究院 | Method for judging insulation aging degrees of alternating current (AC) cables |
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| CN103439639A (en) * | 2013-09-06 | 2013-12-11 | 天津学子电力设备科技有限公司 | XLPE cable insulation aging state assessment method |
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