CN110632480B - 10kV XLPE cable insulation aging state evaluation method - Google Patents

10kV XLPE cable insulation aging state evaluation method Download PDF

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CN110632480B
CN110632480B CN201911062587.8A CN201911062587A CN110632480B CN 110632480 B CN110632480 B CN 110632480B CN 201911062587 A CN201911062587 A CN 201911062587A CN 110632480 B CN110632480 B CN 110632480B
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stage
voltage
test
discharge
phase
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CN110632480A (en
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郭蕾
李丽妮
王冲
张靖康
杨涵
曹伟东
邢立勐
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Southwest Jiaotong University
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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 10kV XLPE cable insulation aging state evaluation method, which comprises the following steps: 1) carrying out partial discharge test on the 10kV XLPE cable; 2) the whole testing process is divided into stages; 3) respectively calculating improved normalized coefficients of the maximum discharge capacity of each stage; 4) calculating an aging state factor; 5) and evaluating the insulation aging state of the test cable by using the aging state factor. The invention has the beneficial effects that: (1) different characteristic quantities represented at different stages in the test process are effectively extracted, so that the evaluation method is more accurate; (2) and extracting characteristic parameters according to the partial discharge information, calculating an aging state factor, and more effectively evaluating the insulation aging state of the XLPE cable.

Description

10kV XLPE cable insulation aging state evaluation method
Technical Field
The invention belongs to the field of power distribution network cable insulation faults, and particularly relates to a 10kV XLPE cable insulation aging state assessment method.
Background
The 10kV cable is used as an important component of the power distribution network, plays a key role in transmitting electric energy, and directly influences the effective operation of a power transmission system and electric equipment due to the advantages and disadvantages of the electric insulation performance, thereby being related to the reliability of the power distribution network. The insulation state of the 10kV XLPE cable is influenced along with factors such as service life, operation environment and the like, so that the research on the evaluation method of the insulation aging state of the 10kV XLPE cable is of great significance.
At present, a fault insulation state evaluation method for a 10kV XLPE cable mainly tests a partial discharge spectrogram of the cable, but the insulation state of the cable is directly represented inaccurately by obtaining basic information of the discharge spectrogram, so that a method for reliably and effectively deeply evaluating the insulation aging state of the 10kV XLPE cable according to the partial discharge spectrogram information is urgently needed.
Disclosure of Invention
The invention aims to provide a 10kV XLPE cable insulation aging state evaluation method.
The technical scheme for realizing the purpose of the invention is as follows:
a10 kV XLPE cable insulation aging state assessment method comprises
Step 1: partial discharge testing was performed on 10kV XLPE cables:
pressurizing 10kV XLPE cable by using a step boosting method, boosting step by using a gradient of 0.5kV, and acquiring phase-discharge capacity data after constant voltage maintenance under each step of voltage
Figure GDA0002628558720000011
Until the voltage is increased to 10 kV;
step 2: the whole testing process is divided into stages,
Figure GDA0002628558720000012
wherein D ═ 1 is the 1 st stage of the test, D ═ 2 is the 2 nd stage of the test, D ═ 3 is the 3 rd stage of the test, and D ═ 4 is the 4 th stage of the test;
and step 3: respectively calculating improved normalized coefficient Z of maximum discharge quantity of each stageiComprises that
3.1 calculate the discharge amount difference a at each phase tested at each level of voltage in each phasei,j,n：
Figure GDA0002628558720000013
Wherein i represents the ith stage, j represents the jth stage voltage in the ith stage, and j is equal to [1,5 ]](ii) a n represents the phase-discharge data collected at each level of voltage
Figure GDA0002628558720000021
N is the nth phase in (1, 360)]N is an integer; q. q.si,j,nPhase data of discharge quantity representing j stage voltage collection in i stage
Figure GDA0002628558720000022
The discharge amount at the nth phase; q. q.si,j,minPhase data of discharge quantity collected under j stage voltage in i stage
Figure GDA0002628558720000023
The minimum discharge amount;
3.2 calculate the maximum discharge specification factor b for each test in each stagei,j：
Figure GDA0002628558720000024
In the formula, ai,j,maxRepresenting the maximum discharge quantity gap at the j level voltage in the ith stage;
3.3 calculating the normalized coefficient of maximum discharge Z in each stagei：
Figure GDA0002628558720000025
And 4, step 4: the aging-state factor is calculated,
Figure GDA0002628558720000026
in the formula, Z1，Z2，Z3，Z4Improved normalization coefficients of the maximum discharge amounts in the 1 st to 4 th test stages, respectively;
and 5: and evaluating the insulation aging state of the test cable by using the aging state factor.
The invention has the beneficial effects that:
(1) different characteristic quantities represented at different stages in the test process are effectively extracted, so that the evaluation method is more accurate;
(2) and extracting characteristic parameters according to the partial discharge information, calculating an aging state factor, and more effectively evaluating the insulation aging state of the XLPE cable.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention is further described below.
Fig. 1 is a flow chart of a 10kV XLPE cable insulation state evaluation method based on improved normalization, which includes the following steps: step 1: partial discharge test of 10kV XLPE cable
Pressurizing 10kV XLPE cable by using a step boosting method, boosting step by using a gradient of 0.5kV, keeping constant voltage for 10min under each voltage level, and acquiring phase-discharge capacity data under each voltage level
Figure GDA0002628558720000027
Boosting the voltage to 10 kV;
step 2: the whole test process is divided into stages
Figure GDA0002628558720000031
That is, when D is 1, the applied voltage is 0.5kV to 2.5kV, which is the S1 stage of the test; when D is 2, the applied voltage is 3.0kV to 5.0kV, which is the S2 th stage of the test; when D is 3, the applied voltage is 5.5kV to 7.5kV, which is the S3 th stage of the test; when D is 4, the applied voltage is 8.0kV to 10.0kV, which is the S4 th stage of the test;
and step 3: calculating improved normalization coefficients Z of maximum discharge amounts in S1, S2, S3 and S4 stages respectivelyi
3.1 calculate the discharge amount difference a at each phase tested at each level of voltage in each phasei,j,n：
Figure GDA0002628558720000032
Wherein i represents the ith stage divided in step 2, i ∈ [1,4 ]]I is an integer; j represents the j stage voltage in the ith stage, j ∈ [1,5 ]]J is an integer; n represents the phase-discharge data collected at each level of voltage
Figure GDA0002628558720000033
N th of (1)Phase, n ∈ [1,360 ]]N is an integer; q. q.si,j,nPhase data of discharge quantity representing j stage voltage collection in i stage
Figure GDA0002628558720000034
The discharge amount at the nth phase; q. q.si,j,minPhase data of discharge quantity collected under j stage voltage in i stage
Figure GDA0002628558720000035
Figure GDA0002628558720000036
The minimum discharge amount;
3.2 calculate the maximum discharge specification factor b for each test in each stagei,j：
Figure GDA0002628558720000037
Wherein i represents the ith stage divided in step 2, i ∈ [1,4 ]]I is an integer; j represents the j stage voltage in the ith stage, j ∈ [1,5 ]]J is an integer; n represents the phase data of the discharge quantity collected under each level of voltage
Figure GDA0002628558720000038
N is the nth phase in (1, 360)]N is an integer; a isi,j,nRepresenting the difference of the discharge amount of the nth phase in the j stage voltage in the ith stage in 3.1; a isi,j,maxRepresenting the maximum discharge quantity gap at the j level voltage in the ith stage;
3.3 calculating the normalized coefficient of maximum discharge Z in each stagei
Figure GDA0002628558720000039
Wherein i represents the ith stage divided in step 2, i ∈ [1,4 ]]I is an integer, and the improved normalization coefficient of the maximum discharge amount in the stage S1 is Z1Maximum discharge amount of stage S2Improved normalization coefficient of Z2The improved normalization coefficient of the maximum discharge amount at the stage S3 is Z3The improved normalization coefficient of the maximum discharge amount at the stage S4 is Z4(ii) a j represents the j stage voltage in the ith stage, j ∈ [1,5 ]]J is an integer; bi,jThe specification factor of the maximum discharge capacity at the j level voltage in the ith stage in 3.2;
and 4, step 4: calculating an aging state factor
Figure GDA0002628558720000041
In the formula, Z1，Z2，Z3，Z4A modified normalization factor for the maximum discharge in each stage in 3.3;
and 5: XLPE cable insulation aging state assessment
When the voltage is more than 5.6, the 10kV XLPE cable is seriously aged;
when the aging state of the 10kV XLPE cable is within an acceptable range, the cable can still continue to operate safely when the aging state is less than 5.6.

Claims (1)

1. A10 kV XLPE cable insulation aging state assessment method is characterized by comprising
Step 1: partial discharge testing was performed on 10kV XLPE cables:
pressurizing 10kV XLPE cable by using a step boosting method, boosting step by using a gradient of 0.5kV, and acquiring phase-discharge capacity data after constant voltage maintenance under each step of voltage
Figure FDA0002258428930000011
Until the voltage is increased to 10 kV;
step 2: the whole testing process is divided into stages,
Figure FDA0002258428930000012
wherein D ═ 1 is the 1 st stage of the test, D ═ 2 is the 2 nd stage of the test, D ═ 3 is the 3 rd stage of the test, and D ═ 4 is the 4 th stage of the test;
and step 3: respectively calculating improved normalized coefficient Z of maximum discharge quantity of each stageiComprises that
3.1 calculate the discharge amount difference a at each phase tested at each level of voltage in each phasei,j,n：
Figure FDA0002258428930000013
Wherein i represents the ith stage, j represents the jth stage voltage in the ith stage, and j is equal to [1,5 ]](ii) a n represents the phase-discharge data collected at each level of voltage
Figure FDA0002258428930000014
N is the nth phase in (1, 360)]N is an integer; q. q.si,j,nPhase data of discharge quantity representing j stage voltage collection in i stage
Figure FDA0002258428930000015
The discharge amount at the nth phase; q. q.si,j,minPhase data of discharge quantity collected under j stage voltage in i stage
Figure FDA0002258428930000016
The minimum discharge amount;
3.2 calculate the maximum discharge specification factor b for each test in each stagei,j：
Figure FDA0002258428930000017
In the formula, ai,j,maxRepresenting the maximum discharge quantity gap at the j level voltage in the ith stage;
3.3 calculating the normalized coefficient of maximum discharge Z in each stagei：
Figure FDA0002258428930000018
And 4, step 4: the aging-state factor is calculated,
Figure FDA0002258428930000019
in the formula, Z1，Z2，Z3，Z4Improved normalization coefficients of the maximum discharge amounts in the 1 st to 4 th test stages, respectively;
and 5: and evaluating the insulation aging state of the test cable by using the aging state factor.
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