CN109061416A - A kind of cable termination interlayer dampness fault simulation and positioning test method - Google Patents
A kind of cable termination interlayer dampness fault simulation and positioning test method Download PDFInfo
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- CN109061416A CN109061416A CN201810958157.3A CN201810958157A CN109061416A CN 109061416 A CN109061416 A CN 109061416A CN 201810958157 A CN201810958157 A CN 201810958157A CN 109061416 A CN109061416 A CN 109061416A
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- dampness
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- interlayer
- test block
- cable termination
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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
Abstract
The invention discloses a kind of cable termination interlayer dampness fault simulation and positioning test methods.Simulator includes replaceable simulation test block, and the both ends of replaceable simulation test block are packaged in shrinkage full skirt after being separately connected built-in cable core jointly.Dampness failure assessment method includes the frequency response curve of test reference cable and assessment cable termination, calculate dampness fault compression, whether the cable interlayer that judge to test and assess by the fault compression that makes moist makes moist, calculates positioning discriminant coefficient and positions the position that makes moist.The beneficial effects of the present invention are: 1, can dummycable terminal difference interlayer make moist situation, it is convenient and efficient, authentic and valid.2, make moist failure assessment method, can judge whether cable termination makes moist and judge the dampness position of cable termination, comprehensively accurate.
Description
Technical field
The invention belongs to cable termination failure fields, and in particular to a kind of cable termination interlayer dampness fault simulation and positioning
Test method.
Background technique
In the operating system of electric system, cable termination is the weak link of comparison, by the operating statistic of many years, hair
Its existing terminal inner insulation defect induced malfunction accounts on the 50% of total accident.In the production and operational process of cable termination, ring
Moisture in border is easier to enter that it is internal and cause to make moist, and when cable terminal is by the time of tide, can make the electric field part of shield end
It concentrates, eventually leads to insulation breakdown.Therefore, the influence that cable termination dampness can be great to generation in terms of cable insulation.
By the time of tide, moisture can usually invade between its internal different layer cable termination, and cable termination can be because of its dampness
Position is different and causes the difference of its dielectric strength, thus causes the anti-breakdown strength of cable termination different, therefore judge cable
The dampness position of terminal is of great significance, and lacks the means of effective position cable termination dampness failure at present, can not obtain
In the case where knowing cable termination dampness reason, researcher can not determine that the dampness inside cable termination is distributed, therefore need one
Kind cable termination interlayer dampness fault location test method.
Summary of the invention
The object of the present invention is to provide a kind of cable termination interlayer dampness fault simulation and positioning test methods.
A kind of cable termination interlayer dampness fault simulation and positioning test method, including simulation below and testing procedure:
Step 1: assembling cable termination interlayer dampness fault simulator；
The fault simulator, including replaceable simulation test block (14)；The replaceable simulation test block (14) includes column
Central column semi-conductive layer (10), central column are successively wrapped up in shape copper core conductor (9), the outside of column copper core conductor (9) from inside to outside
Insulating layer (11), central column stress tube layer (12) and central column surrounding layer (13)；Built-in cable core 1 (5) and built-in cable core 2 (8)
One end is connected respectively to the both ends of column copper core conductor (9)；The main body of the built-in cable core 1 (5) and built-in cable core 2 (8) and
Replaceable simulation test block (14) is packaged in jointly in shrinkage full skirt, the other end point of built-in cable core 1 (5) and built-in cable core 2 (8)
Shrinkage full skirt is not protruded from, and is set with high-voltage isulation Rubber end 1 (3) and high-voltage isulation Rubber end 2 (4).
Step 2: the interlayer dampness fault simulation processing of replaceable simulation test block；
2.1 prepare completely new replaceable simulation test block (14), are put into 110 DEG C of high temperature drying casees and carry out at 24 hours
Reason, do not made moist replaceable simulation test block；
2.2 prepare completely new replaceable simulation test block (14), are put into 110 DEG C of high temperature drying casees after 24 hours, with drop
Pipe circumferentially uniformly instills total 10ml distilled water between column copper core conductor (9) and cyclic annular semi-conductive layer (10) and seals quiet
It sets 24 hours, the replaceable simulation test made moist between column copper core conductor (9) and cyclic annular semi-conductive layer (10) is obtained after processing
Block；
2.3 prepare completely new replaceable simulation test block (14), are put into 110 DEG C of high temperature drying casees after 24 hours, with drop
Pipe circumferentially uniformly instills total 10ml distilled water and is sealed between cyclic annular semi-conductive layer (10) and central column insulating layer (11)
24 hours are stood, the replaceable simulation test block to make moist between cyclic annular semi-conductive layer (10) and central column insulating layer (11) is obtained；
2.4, which prepare completely new replaceable simulation test block (14), was put into 110 DEG C of high temperature drying casees after 24 hours, used dropper
Total 10ml distilled water is circumferentially uniformly instilled between central column insulating layer (11) and central column stress tube layer (12) and is sealed
24 hours are stood, the replaceable simulation test made moist between central column insulating layer (11) and central column stress tube layer (12) is obtained
Block；
Step 3: the assignment test of cable termination interlayer dampness simulated failure；
For the replaceable simulation test block of difference interlayer dampness obtained in step 2, group is carried out respectively according to step 1
Dress obtains the cable termination fault simulation of different interlayer dampness, carries out assignment test to the abort situation of interlayer dampness simulation,
The following steps are included:
3.1: taking undamped cable termination, dielectric spectra test is done in 1Hz~1000Hz frequency range, choose 10 frequency tests
The frequency of point, i-th of frequency test point is denoted as fi, it is followed successively by f1=1Hz, f2=2Hz, f3=5Hz, f4=10Hz, f5=20Hz,
f6=50Hz, f7=100Hz, f8=200Hz, f9=500Hz, f10The point of=1000Hz is as test point, obtained frequency response
Value is the real part of complex dielectric permittivity and the ratio of imaginary part, is denoted as Fi, i is integer, and i ∈ [1,10]；
3.2: obtaining reference cable terminal frequency response curve F (f) using piecewise linear interpolation；
3.3: taking cable termination to be tested and assessed, dielectric spectra test, and selection and step are done in 1Hz~1000Hz frequency range
For 3.1 identical 10 points as test point, obtained frequency response values are the real part and imaginary part of complex dielectric permittivity
Ratio is denoted as Gi, i is integer, and i ∈ [1, n]；
3.4: obtaining cable under test terminal frequency response curve G (f) using piecewise linear interpolation；
3.5: dampness fault compression ξ is calculated, as follows:
In formula, i is integer, and i ∈ [1,9].
Further, further comprising the steps of:
Step 1: judgement dampness fault compression ξ size, if 0 ξ≤1 <, cable under test terminal interlayer does not make moist；If ξ >
1, continue analysis and determines；
Step 2:: calculating positioning discriminant coefficient η,
Step 3: when 0.5 η≤10 <, then making moist between the conductor and semi-conductive layer of cable under test terminal；When 10 η≤50 <,
The then semi-conductive layer of cable under test terminal and insulation interlayer dampness；As η > 50, then the insulating layer and stress tube of cable under test terminal
Interlayer dampness.
The beneficial effects of the present invention are: 1, can dummycable terminal difference interlayer make moist situation, it is convenient and efficient, true
Effectively.2, make moist failure assessment method, can judge whether cable termination makes moist and judge the dampness position of cable termination,
It is comprehensively accurate.
Detailed description of the invention
Fig. 1 is cable termination interlayer dampness failure simulation device structure chart.
Fig. 2 is cable termination interlayer dampness positioning determination method flow chart.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is cable termination interlayer dampness fault location simulator structural schematic diagram, including cable core connector 1 (1), cable core
It is connector 2 (2), high-voltage isulation Rubber end 1 (3), high-voltage isulation Rubber end 2 (4), shrinkage full skirt 1 (5), shrinkage full skirt 2 (6), built-in
Cable core 1 (7), built-in cable core 2 (8), column copper core conductor (9), cyclic annular semi-conductive layer (10), central column insulating layer (11), annulated column
Shape stress tube layer (12), central column surrounding layer (13), replaceable simulation test block (14), double U annular full skirts 1 (15), double U annular
Full skirt 2 (16), double U annular full skirts 3 (17)；Cable core connector 1 (1) connects built-in cable core 1 (7), high-voltage isulation Rubber end 1 (3) packet
Cable core connector 1 (1) is wrapped up in, cable core connector 2 (2) connects built-in cable core 2 (8), and high-voltage isulation Rubber end 2 (4) wraps up cable core connector 2
(2), shrinkage full skirt 1 (6) wraps up built-in cable core 1 (5), and shrinkage full skirt 2 (7) wraps up built-in cable core 2 (8), built-in cable core 1 (7) with
Replaceable simulation test block (14) right end connects, and built-in cable core 2 (8) connects with replaceable simulation test block (14) left end, column
For copper core conductor (9) by cyclic annular semi-conductive layer (10) tight, cyclic annular semi-conductive layer (10) is close by central column insulating layer (11)
Package, central column insulating layer (11) is by central column stress tube layer (12) tight, and central column stress tube layer (12) is by central column
Surrounding layer (13) tight, column copper core conductor (9), cyclic annular semi-conductive layer (10), central column insulating layer (11), central column are answered
Replaceable simulation test block (14), connection, package are separated and collectively formed between solenoid layer (12), central column surrounding layer (13)
It is close.
In specific test: preparing completely new replaceable simulation test block (14), be put into 24 in 110 DEG C of high temperature drying casees
Hour is handled, replaceable simulation test of not made moist block (14)；Prepare completely new replaceable simulation test block (14), puts
Enter in 110 DEG C of high temperature drying casees after 24 hours, with dropper along circle between column copper core conductor (9) and cyclic annular semi-conductive layer (10)
Week uniformly instills total 10ml distilled water and sealing and standing 24 hours, and column copper core conductor (9) is obtained after processing and ring-type is partly led
Replaceable simulation test block (14) are made moist between electric layer (10)；Prepare completely new replaceable simulation test block (14), is put into 110 DEG C
It is circumferentially uniform between cyclic annular semi-conductive layer (10) and central column insulating layer (11) with dropper in high temperature drying case after 24 hours
Total 10ml distilled water and sealing and standing 24 hours are instilled, are obtained between cyclic annular semi-conductive layer (10) and central column insulating layer (11)
It makes moist replaceable simulation test block (14)；Prepare completely new replaceable simulation test block (14) to be put into 110 DEG C of high temperature drying casees
After 24 hours, circumferentially uniformly instilled between central column insulating layer (11) and central column stress tube layer (12) with dropper total
10ml distilled water and sealing and standing 24 hours, obtaining making moist between central column insulating layer (11) and central column stress tube layer (12) can
Change simulation test block (14)；
Fig. 2 is cable termination interlayer dampness positioning determination method flow chart, and this method can make moist to cable termination interlayer
The cable that fault simulation obtains carries out positioning judgement.
Step 1: taking undamped cable termination, and dielectric spectra test is done in 1Hz~1000Hz frequency range, chooses 10 frequencies
The frequency of test point, i-th of frequency test point is denoted as fi, it is followed successively by f1=1Hz, f2=2Hz, f3=5Hz, f4=10Hz, f5=
20Hz, f6=50Hz, f7=100Hz, f8=200Hz, f9=500Hz, f10The point of=1000Hz is as test point, obtained frequency
Rate response is the real part of complex dielectric permittivity and the ratio of imaginary part, is denoted as Fi, i is integer, and i ∈ [1,10]；
Step 2: reference cable terminal frequency response curve F (f) is obtained using piecewise linear interpolation；
Step 3: taking cable termination to be tested and assessed, and dielectric spectra test is done in 1Hz~1000Hz frequency range, and chooses and walk
For rapid identical 10 points as test point, obtained frequency response values are the real part and imaginary part of complex dielectric permittivity
Ratio is denoted as Gi, i is integer, and i ∈ [1, n]；
Step 4: cable under test terminal frequency response curve G (f) is obtained using piecewise linear interpolation；
Step 5: calculating dampness fault compression ξ, as follows:
In formula, i is integer, and i ∈ [1,9].
Further, further comprising the steps of:
Step 1: judgement dampness fault compression ξ size, if 0 ξ≤1 <, cable under test terminal interlayer does not make moist；If ξ >
1, continue analysis and determines；
Step 2: calculating positioning discriminant coefficient η,
Step 3: it when 0.5 η≤10 <, then makes moist between the conductor and semi-conductive layer of cable under test terminal；When 10 η≤50 <,
The then semi-conductive layer of cable under test terminal and insulation interlayer dampness；As η > 50, then the insulating layer and stress tube of cable under test terminal
Interlayer dampness.
Claims (2)
1. a kind of cable termination interlayer dampness fault simulation and positioning test method, which is characterized in that including simulation below and
Testing procedure:
Step 1: assembling cable termination interlayer dampness fault simulator；
The fault simulator, including replaceable simulation test block (14)；The replaceable simulation test block (14) includes column copper
Central column semi-conductive layer (10), central column insulation are successively wrapped up in core conductor (9), the outside of column copper core conductor (9) from inside to outside
Layer (11), central column stress tube layer (12) and central column surrounding layer (13)；One end of built-in cable core 1 (5) and built-in cable core 2 (8)
It is connected respectively to the both ends of column copper core conductor (9)；The main body of the built-in cable core 1 (5) and built-in cable core 2 (8) and removable
It changes the mold quasi- test block (14) to be packaged in jointly in shrinkage full skirt, the other end difference of built-in cable core 1 (5) and built-in cable core 2 (8) is convex
For shrinkage full skirt, and it is set with high-voltage isulation Rubber end 1 (3) and high-voltage isulation Rubber end 2 (4)；
Step 2: the interlayer dampness fault simulation processing of replaceable simulation test block；
2.1 prepare completely new replaceable simulation test block (14), are put into 110 DEG C of high temperature drying casees and handle within 24 hours, obtain
To the replaceable simulation test block that do not make moist；
2.2 prepare completely new replaceable simulation test block (14), are put into 110 DEG C of high temperature drying casees after 24 hours, are existed with dropper
Total 10ml distilled water and sealing and standing 24 are circumferentially uniformly instilled between column copper core conductor (9) and cyclic annular semi-conductive layer (10)
Hour, the replaceable simulation test block to make moist between column copper core conductor (9) and cyclic annular semi-conductive layer (10) is obtained after processing；
2.3 prepare completely new replaceable simulation test block (14), are put into 110 DEG C of high temperature drying casees after 24 hours, are existed with dropper
Total 10ml distilled water and sealing and standing are circumferentially uniformly instilled between cyclic annular semi-conductive layer (10) and central column insulating layer (11)
24 hours, obtain the replaceable simulation test block to make moist between cyclic annular semi-conductive layer (10) and central column insulating layer (11)；
2.4, which prepare completely new replaceable simulation test block (14), is put into 110 DEG C of high temperature drying casees after 24 hours, with dropper in ring
Total 10ml distilled water and sealing and standing are circumferentially uniformly instilled between column insulating layer (11) and central column stress tube layer (12)
24 hours, obtain the replaceable simulation test block to make moist between central column insulating layer (11) and central column stress tube layer (12)；
Step 3: the assignment test of cable termination interlayer dampness simulated failure；
For the replaceable simulation test block of difference interlayer dampness obtained in step 2, assembled respectively according to step 1,
The cable termination fault simulation for obtaining different interlayer dampness carries out assignment test, packet to the abort situation of interlayer dampness simulation
Include following steps:
3.1: undamped cable termination is taken, dielectric spectra test is done in 1Hz~1000Hz frequency range, chooses 10 frequency test points,
The frequency of i-th of frequency test point is denoted as fi, it is followed successively by f1=1Hz, f2=2Hz, f3=5Hz, f4=10Hz, f5=20Hz, f6
=50Hz, f7=100Hz, f8=200Hz, f9=500Hz, f10The point of=1000Hz is as test point, obtained frequency response values
For the real part of complex dielectric permittivity and the ratio of imaginary part, it is denoted as Fi, i is integer, and i ∈ [1,10]；
3.2: obtaining reference cable terminal frequency response curve F (f) using piecewise linear interpolation；
3.3: taking cable termination to be tested and assessed, dielectric spectra test is done in 1Hz~1000Hz frequency range, and choose and step 3.1 phase
With 10 points as test point, obtained frequency response values are the real part of complex dielectric permittivity and the ratio of imaginary part,
It is denoted as Gi, i is integer, and i ∈ [1, n]；
3.4: obtaining cable under test terminal frequency response curve G (f) using piecewise linear interpolation；
3.5: dampness fault compression ξ is calculated, as follows:
In formula, i is integer, and i ∈ [1,9].
2. a kind of cable termination interlayer dampness fault simulation as described in claim 1 and positioning test method, which is characterized in that
It is further comprising the steps of:
Step 1: judgement dampness fault compression ξ size, if 0 ξ≤1 <, cable under test terminal interlayer does not make moist；
If ξ > 1, continues analysis and determine；
Step 2:: calculating positioning discriminant coefficient η,
Step 3: when 0.5 η≤10 <, then making moist between the conductor and semi-conductive layer of cable under test terminal；When 10 η≤50 <, then to
Survey the semi-conductive layer and insulation interlayer dampness of cable termination；As η > 50, then the insulating layer of cable under test terminal and stress tube interlayer
Dampness.
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Cited By (3)
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| CN111025091A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | Intelligent evaluation method for uneven damp state of urban distribution network cable |
| CN113324703A (en) * | 2021-06-03 | 2021-08-31 | 国网四川省电力公司成都供电公司 | Online monitoring method for water inlet and moisture of cable joint |
| CN113406462A (en) * | 2021-06-17 | 2021-09-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
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Effective date of registration: 20190521 Address after: 650200 No. 105 Yunda West Road, Kunming Economic and Technological Development Zone, Yunnan Province Applicant after: Electric Power Research Institute of Yunnan Power System Ltd Applicant after: Southwest Jiaotong University Address before: 611756 Research Institute of Science and Technology Development, Southwest Jiaotong University, Chengdu High-tech Zone, Sichuan Province Applicant before: Southwest Jiaotong University |
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Inventor after: Xiang Enxin Inventor after: Wang Ke Inventor after: Guo Lei Inventor after: Yu Yang Inventor after: Bai Longlei Inventor after: Chen Yuanhu Inventor after: Che Yuxuan Inventor after: Li Lini Inventor after: Zhou Lijun Inventor after: Wang Weimin Inventor before: Guo Lei Inventor before: Yu Yang Inventor before: Bai Longlei Inventor before: Chen Yuanhu Inventor before: Che Yuxuan Inventor before: Li Lini Inventor before: Zhou Lijun Inventor before: Wang Weimin |
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Effective date of registration: 20200824 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: 650200 No. 105 Yunda West Road, Kunming Economic and Technological Development Zone, Yunnan Province Co-patentee before: SOUTHWEST JIAOTONG University Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute |