CN109061416B - 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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- CN109061416B CN109061416B CN201810958157.3A CN201810958157A CN109061416B CN 109061416 B CN109061416 B CN 109061416B CN 201810958157 A CN201810958157 A CN 201810958157A CN 109061416 B CN109061416 B CN 109061416B
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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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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
On the 50% of the existing total accident of its terminal inner insulation defect induced malfunction Zhan.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 copper
Central column semi-conductive layer 10, central column insulating layer 11, ring are successively wrapped up in core conductor 9, the outside of column copper core conductor 9 from inside to outside
Column stress tube layer 12 and central column surrounding layer 13；One end of cable core 8 is connected respectively to column built in cable core 5 and second built in first
The both ends of shape copper core conductor 9；The main body of cable core 8 built in cable core 5 and second built in described first and replaceable simulation test block
14 are packaged in jointly in shrinkage full skirt, and the other end of cable core 8 protrudes from shrinkage umbrella respectively built in cable core 5 and second built in first
Skirt, and it is set with the first high-voltage isulation Rubber end 3 and the second high-voltage isulation Rubber end 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,
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, use dropper
Circumferentially total 10ml distilled water is uniformly instilled between column copper core conductor 9 and cyclic annular semi-conductive layer 10 and sealing and standing 24 is small
When, 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, use dropper
Total 10ml distilled water and sealing and standing 24 are circumferentially uniformly instilled between cyclic annular semi-conductive layer 14 and central column insulating layer 11
Hour, 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, was put into 110 DEG C of high temperature drying casees after 24 hours, was existed with dropper
Total 10ml distilled water and sealing and standing 24 are circumferentially uniformly instilled between central column insulating layer 11 and central column stress tube layer 12
Hour, 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, 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 ∈ [1,10]；
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 4: 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 5: positioning discriminant coefficient η is calculated,
Step 6: 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 that cable termination interlayer makes moist fault location simulator structural schematic diagram, including the first cable core connector 1, the
Two cable core connectors 2, the first high-voltage isulation Rubber end 3, the second high-voltage isulation Rubber end 4, the first shrinkage full skirt 6, the second shrinkage umbrella
Cable core 8 built in cable core 5, second built in skirt 7, first, column copper core conductor 9, cyclic annular semi-conductive layer 10, central column insulating layer 11,
Central column stress tube layer 12, central column surrounding layer 13, the U annular full skirt 15, second pairs of replaceable simulation test block 14, first pairs U
The double U annular full skirts 17 of annular full skirt 16, third；Cable core 7 built in first cable core connector 1 connection first, the first high-voltage isulation rubber
The first cable core connector 1 of first 3 package, cable core 8 built in the second cable core connector 2 connection second, the second high-voltage isulation Rubber end 4 wrap up cable
The second cable core of core connector 2, cable core 7 built in the first shrinkage full skirt 5 package first, cable core built in the second shrinkage full skirt 6 package second
8, cable core 7 built in first connects with 14 right end of replaceable simulation test block, cable core 8 built in second and replaceable simulation test block 14
Left end connects, and column copper core conductor 9 is by cyclic annular 10 tight of semi-conductive layer, and cyclic annular semi-conductive layer 10 is by central column insulating layer 11
Tight, central column insulating layer 11 by 12 tight of central column stress tube layer, central column stress tube layer 12 by central column outside
13 tight of covering, column copper core conductor 9, cyclic annular semi-conductive layer 10, central column insulating layer 11, central column stress tube layer 12,
Replaceable simulation test block 14 is separated and collectively formed between central column surrounding layer 13, and connection, package are close.
In specific test: preparing completely new replaceable simulation test block 14, it is small to be put into 110 DEG C of high temperature drying casees 24
Shi Jinhang processing, replaceable simulation test of not made moist block 14；Prepare completely new replaceable simulation test block 14, is put into 110
In DEG C high temperature drying case after 24 hours, with dropper between column copper core conductor 9 and cyclic annular semi-conductive layer 10 circumferentially uniform drop
Enter total 10ml distilled water and sealing and standing 24 hours, is obtained after processing between column copper core conductor 9 and cyclic annular semi-conductive layer 10
Make moist replaceable simulation test block 14；Prepare completely new replaceable simulation test block 14, it is small to be put into 110 DEG C of high temperature drying casees 24
Shi Hou circumferentially uniformly instills total 10ml distilled water simultaneously between cyclic annular semi-conductive layer 10 and central column insulating layer 11 with dropper
Sealing and standing 24 hours, obtain the replaceable simulation test block 14 that makes moist between cyclic annular semi-conductive layer 10 and central column insulating layer 11；
Prepare completely new replaceable simulation test block 14 to be put into 110 DEG C of high temperature drying casees after 24 hours, be insulated with dropper in central column
Total 10ml distilled water and sealing and standing 24 hours are circumferentially uniformly instilled between layer 11 and central column stress tube layer 12, obtain ring
Make moist replaceable simulation test block 14 between column insulating layer 11 and central column stress tube layer 12；
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 ∈ [1,10]；
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 7: 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 8: calculating positioning discriminant coefficient η,
Step 9: 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)；Cable core built in first (5) and cable core built in second (8)
One end be connected respectively to the both ends of column copper core conductor (9)；Cable core (5) built in described first and cable core built in second (8)
Main body and replaceable simulation test block (14) are packaged in jointly in shrinkage full skirt, cable core built in first (5) and cable built in second
The other end of core (8) protrudes from shrinkage full skirt respectively, and is set with the first high-voltage isulation Rubber end (3) and the second high-voltage isulation
Rubber end (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], n=10；
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 4: 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 5: positioning discriminant coefficient η is calculated,
Step 6: 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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| CN111025091B (en) * | 2019-11-19 | 2022-04-26 | 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 |
| CN113324703B (en) * | 2021-06-03 | 2022-12-02 | 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 |
| CN113406462B (en) * | 2021-06-17 | 2022-08-30 | 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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| CN107422234A (en) * | 2017-08-24 | 2017-12-01 | 西南交通大学 | A kind of method for assessing tractive transformer humidified insulation state in military service |
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| JP2012154730A (en) * | 2011-01-25 | 2012-08-16 | Chugoku Electric Power Co Inc:The | Equipment diagnostic device and equipment diagnostic method |
| CN104049167A (en) * | 2014-07-04 | 2014-09-17 | 国家电网公司 | Method for simulating defects of oil impregnated paper bushings |
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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 |