CN112180175A - Ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters - Google Patents

Ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters Download PDF

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CN112180175A
CN112180175A CN202011076810.7A CN202011076810A CN112180175A CN 112180175 A CN112180175 A CN 112180175A CN 202011076810 A CN202011076810 A CN 202011076810A CN 112180175 A CN112180175 A CN 112180175A
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loss angle
dielectric
angle data
dielectric loss
spectrum
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盛进路
万一阳
梅亚
唐可
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Chongqing Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • 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 relates to a ship cable insulation corrosion degree evaluation method based on multidimensional relaxation parameters, which comprises the steps of firstly testing a broadband dielectric spectrum dielectric loss angle of a ship cable to be tested; then calculating a multi-dimensional relaxation parameter xi of the ship cable to be measured; and finally, evaluating the corrosion degree of the insulation of the ship cable to be tested according to the multidimensional relaxation parameter xi, and laying a foundation for ensuring the safe operation of the cable.

Description

Ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters
Technical Field
The invention belongs to the field of cable insulation aging state evaluation, and particularly relates to a ship cable insulation corrosion degree evaluation method based on multidimensional relaxation parameters.
Background
The crosslinked polyethylene has the advantages of simple structure, light weight, good heat resistance, strong load capacity, high mechanical strength and the like, and is widely applied to the insulation of various cables. The ship cable is often corroded by seawater, so that the whole insulation body is corroded, the tolerance capability of the cable is reduced, cable faults are caused, and the safe operation of various electrical equipment is seriously threatened.
In order to accurately and efficiently evaluate the insulation corrosion degree of the ship cable and reduce the occurrence rate of cable faults, an evaluation method for the insulation corrosion degree of the ship cable is urgently needed. The method is a ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters, is simple to operate, and can calculate and measure broadband dielectric spectrum dielectric loss angle data to assess the cable insulation corrosion degree.
Disclosure of Invention
The invention relates to a ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters, which is used for assessing the corrosion degree of ship cable insulation and specifically comprises the following steps:
the first step is as follows: collecting broadband dielectric spectrum dielectric loss angle information of a target ship cable;
h times of broadband dielectric spectrum dielectric loss angle tests are carried out on the target ship cable, and the discrete broadband dielectric spectrum dielectric loss angle data collected from the target ship cable are recorded as A(i,a)I represents i times of the wide-band dielectric spectrum dielectric loss angle test, 0<i is less than or equal to h; a represents a discrete broadband dielectric spectrum dielectric loss angle data frequency point, and a belongs to {0.01,0.02,0.04,0.1,0.2,0.4,1,2,4,10,20,40,100,200,400,1000 };
the second step is that: calculating multi-dimensional relaxation parameters of the target ship cable, wherein the method comprises the following steps;
1) for the collected discrete broadband dielectric spectrum dielectric loss angle data A(i,a)Performing multi-stage decomposition, and recording the dielectric loss angle data of the two-stage decomposition discrete broadband dielectric spectrum as B(i,a)(ii) a The four-level decomposition discrete broadband dielectric spectrum dielectric loss angle data is recorded as C(i,a)(ii) a The dielectric loss angle data of the six-stage dissociation dispersion broadband dielectric spectrum is recorded as D(i,a)(ii) a The process of multi-stage decomposition is as follows:
Figure BDA0002717980760000011
Figure BDA0002717980760000021
Figure BDA0002717980760000022
2) for discrete broadband dielectric spectrum dielectric loss angle data A(i,a)Two-stage decomposition of discrete wideband dielectric spectrum dielectric loss angle data B(i,a)Four-level decomposition discrete broadband dielectric spectrum dielectric loss angle data C(i,a)Six-stage dissociation dispersion broadband dielectric spectrum dielectric loss angle data D(i,a)Respectively carrying out mean value weighting treatment;
Figure BDA0002717980760000023
the dielectric loss angle data of the mean weighted discrete broadband dielectric spectrum,
Figure BDA0002717980760000024
Two-stage decomposition of the dielectric loss angle data of the discrete broadband dielectric spectrum for mean weighting,
Figure BDA0002717980760000025
Decomposing the dielectric loss angle data of the discrete broadband dielectric spectrum for mean weight four-level decomposition,
Figure BDA0002717980760000026
Dispersing the broadband dielectric spectrum dielectric loss angle data for the mean weighted six-stage dissociation; the process of mean weighting is as follows:
Figure BDA0002717980760000027
Figure BDA0002717980760000028
Figure BDA0002717980760000029
Figure BDA00027179807600000210
max[A(i,a)]is represented by A(i,a)Maximum value of (1); min [ A ](i,a)]Is represented by A(i,a)Minimum value of (1); max [ B ](i,a)]Is represented by B(i,a)Maximum value of (1); min [ B ](i,a)]Is represented by B(i,a)Minimum value of (1); max [ C ](i,a)]Is represented by C(i,a)Maximum value of (1); min [ C ](i,a)]Is represented by C(i,a)Minimum value of (1); max [ D ](i,a)]Represents D(i,a)Maximum value of (1); min [ D ](i,a)]Represents D(i,a)Minimum value of (1);
3) discretizing broadband dielectric spectrum dielectric loss angle data from mean weights
Figure BDA00027179807600000211
Extracting relaxation parameter xi from(i，1)(ii) a Two-stage decomposition of discrete wideband dielectric spectrum dielectric loss angle data from mean weighting
Figure BDA00027179807600000212
Extracting relaxation parameter xi from(i，2)(ii) a Decomposition of discrete wideband dielectric spectrum dielectric loss angle data from mean weighted four levels
Figure BDA00027179807600000213
Extracting relaxation parameter xi from(i，3)(ii) a Dispersion of broadband dielectric spectrum dielectric loss angle data from mean weighted six-fraction
Figure BDA00027179807600000214
Extracting relaxation parameter xi from(i，4)(ii) a The process of dielectric relaxation parameter extraction is as follows:
Figure BDA0002717980760000031
Figure BDA0002717980760000032
Figure BDA0002717980760000033
Figure BDA0002717980760000034
represents a matrix dot product;
4) and calculating a multidimensional relaxation parameter xi in the following process:
Figure BDA0002717980760000035
the third step: through the multidimensional relaxation parameter xi calculated in the second step, the following evaluation is performed:
if xi is less than theta1The insulation of the target ship cable is slightly corroded;
if xi is greater than or equal to theta1And xi is less than theta2The insulation of the target ship cable is moderate corrosion;
if xi is greater than or equal to theta2And xi is less than theta3The insulation of the target ship cable is severe corrosion;
if xi is greater than or equal to theta3The insulation of the target ship cable is completely corroded;
wherein theta is1＝0.223，θ2＝5.875，θ3＝19.025。
Drawings
FIG. 1 is a flow chart of the present invention for evaluating insulation of a marine cable;
Detailed Description
The invention is further illustrated below with reference to a flow diagram:
according to the ship cable insulation evaluation flow chart in fig. 1, the specific calculation steps of the invention are as follows:
the first step is as follows: collecting broadband dielectric spectrum dielectric loss angle information of a target ship cable;
h times of broadband dielectric spectrum dielectric loss angle test is carried out on the target ship cable, and the target ship cable is electrifiedThe data of the dielectric loss angle of the discrete broadband dielectric spectrum collected in the cable is recorded as A(i,a)I represents i times of the wide-band dielectric spectrum dielectric loss angle test, 0<i is less than or equal to h; a represents a discrete broadband dielectric spectrum dielectric loss angle data frequency point, and a belongs to {0.01,0.02,0.04,0.1,0.2,0.4,1,2,4,10,20,40,100,200,400,1000 };
the second step is that: calculating multi-dimensional relaxation parameters of the target ship cable, wherein the method comprises the following steps;
1) for the collected discrete broadband dielectric spectrum dielectric loss angle data A(i,a)Performing multi-stage decomposition, and recording the dielectric loss angle data of the two-stage decomposition discrete broadband dielectric spectrum as B(i,a)(ii) a The four-level decomposition discrete broadband dielectric spectrum dielectric loss angle data is recorded as C(i,a)(ii) a The dielectric loss angle data of the six-stage dissociation dispersion broadband dielectric spectrum is recorded as D(i,a)(ii) a The process of multi-stage decomposition is as follows:
Figure BDA0002717980760000041
Figure BDA0002717980760000042
Figure BDA0002717980760000043
2) for discrete broadband dielectric spectrum dielectric loss angle data A(i,a)Two-stage decomposition of discrete wideband dielectric spectrum dielectric loss angle data B(i,a)Four-level decomposition discrete broadband dielectric spectrum dielectric loss angle data C(i,a)Six-stage dissociation dispersion broadband dielectric spectrum dielectric loss angle data D(i,a)Respectively carrying out mean value weighting treatment;
Figure BDA0002717980760000044
the dielectric loss angle data of the mean weighted discrete broadband dielectric spectrum,
Figure BDA0002717980760000045
Two-stage decomposition of the dielectric loss angle data of the discrete broadband dielectric spectrum for mean weighting,
Figure BDA0002717980760000046
Decomposing the dielectric loss angle data of the discrete broadband dielectric spectrum for mean weight four-level decomposition,
Figure BDA0002717980760000047
Dispersing the broadband dielectric spectrum dielectric loss angle data for the mean weighted six-stage dissociation; the process of mean weighting is as follows:
Figure BDA0002717980760000048
Figure BDA0002717980760000051
Figure BDA0002717980760000052
Figure BDA0002717980760000053
max[A(i,a)]is represented by A(i,a)Maximum value of (1); min [ A ](i,a)]Is represented by A(i,a)Minimum value of (1); max [ B ](i,a)]Is represented by B(i,a)Maximum value of (1); min [ B ](i,a)]Is represented by B(i,a)Minimum value of (1); max [ C ](i,a)]Is represented by C(i,a)Maximum value of (1); min [ C ](i,a)]Is represented by C(i,a)Minimum value of (1); max [ D ](i,a)]Represents D(i,a)Maximum value of (1); min [ D ](i,a)]Represents D(i,a)Minimum value of (1);
3) discretizing broadband dielectric spectrum dielectric loss angle data from mean weights
Figure BDA0002717980760000054
Extracting relaxation parameter xi from(i，1)(ii) a Two-stage decomposition of discrete wideband dielectric spectrum dielectric loss angle data from mean weighting
Figure BDA0002717980760000055
Extracting relaxation parameter xi from(i，2)(ii) a Decomposition of discrete wideband dielectric spectrum dielectric loss angle data from mean weighted four levels
Figure BDA0002717980760000056
Extracting relaxation parameter xi from(i，3)(ii) a Dispersion of broadband dielectric spectrum dielectric loss angle data from mean weighted six-fraction
Figure BDA0002717980760000057
Extracting relaxation parameter xi from(i，4)(ii) a The process of dielectric relaxation parameter extraction is as follows:
Figure BDA0002717980760000058
Figure BDA0002717980760000059
Figure BDA00027179807600000510
Figure BDA00027179807600000511
represents a matrix dot product;
4) and calculating a multidimensional relaxation parameter xi in the following process:
Figure BDA0002717980760000061
the third step: through the multidimensional relaxation parameter xi calculated in the second step, the following evaluation is performed:
if xi is less than theta1The insulation of the target ship cable is slightly corroded;
if xi is greater than or equal to theta1And xi is less than theta2The insulation of the target ship cable is moderate corrosion;
if xi is greater than or equal to theta2And xi is less than theta3The insulation of the target ship cable is severe corrosion;
if xi is greater than or equal to theta3The insulation of the target ship cable is completely corroded;
wherein theta is1＝0.223，θ2＝5.875，θ3＝19.025。

Claims (1)

1. A ship cable insulation corrosion degree assessment method based on multidimensional relaxation parameters is characterized by comprising the following steps:
the first step is as follows: collecting broadband dielectric spectrum dielectric loss angle information of a target ship cable;
h times of broadband dielectric spectrum dielectric loss angle tests are carried out on the target ship cable, and the discrete broadband dielectric spectrum dielectric loss angle data collected from the target ship cable are recorded as A(i,a)I represents i times of the wide-band dielectric spectrum dielectric loss angle test, 0<i is less than or equal to h; a represents a discrete broadband dielectric spectrum dielectric loss angle data frequency point, and a belongs to {0.01,0.02,0.04,0.1,0.2,0.4,1,2,4,10,20,40,100,200,400,1000 };
the second step is that: calculating multi-dimensional relaxation parameters of the target ship cable, wherein the method comprises the following steps;
1) for the collected discrete broadband dielectric spectrum dielectric loss angle data A(i,a)Performing multi-stage decomposition, and recording the dielectric loss angle data of the two-stage decomposition discrete broadband dielectric spectrum as B(i,a)(ii) a The four-level decomposition discrete broadband dielectric spectrum dielectric loss angle data is recorded as C(i,a)(ii) a The dielectric loss angle data of the six-stage dissociation dispersion broadband dielectric spectrum is recorded as D(i,a)(ii) a The process of multi-stage decomposition is as follows:
Figure FDA0002717980750000011
Figure FDA0002717980750000012
Figure FDA0002717980750000013
2) for discrete broadband dielectric spectrum dielectric loss angle data A(i,a)Two-stage decomposition of discrete wideband dielectric spectrum dielectric loss angle data B(i,a)Four-level decomposition discrete broadband dielectric spectrum dielectric loss angle data C(i,a)Six-stage dissociation dispersion broadband dielectric spectrum dielectric loss angle data D(i,a)Respectively carrying out mean value weighting treatment;
Figure FDA0002717980750000014
the dielectric loss angle data of the mean weighted discrete broadband dielectric spectrum,
Figure FDA0002717980750000015
Two-stage decomposition of the dielectric loss angle data of the discrete broadband dielectric spectrum for mean weighting,
Figure FDA0002717980750000016
Decomposing the dielectric loss angle data of the discrete broadband dielectric spectrum for mean weight four-level decomposition,
Figure FDA0002717980750000017
Dispersing the broadband dielectric spectrum dielectric loss angle data for the mean weighted six-stage dissociation; the process of mean weighting is as follows:
Figure FDA0002717980750000018
Figure FDA0002717980750000019
Figure FDA0002717980750000021
Figure FDA0002717980750000022
max[A(i,a)]is represented by A(i,a)Maximum value of (1); min [ A ](i,a)]Is represented by A(i,a)Minimum value of (1); max [ B ](i,a)]Is represented by B(i,a)Maximum value of (1); min [ B ](i,a)]Is represented by B(i,a)Minimum value of (1); max [ C ](i,a)]Is represented by C(i,a)Maximum value of (1); min [ C ](i,a)]Is represented by C(i,a)Minimum value of (1); max [ D ](i,a)]Represents D(i,a)Maximum value of (1); min [ D ](i,a)]Represents D(i,a)Minimum value of (1);
3) discretizing broadband dielectric spectrum dielectric loss angle data from mean weights
Figure FDA0002717980750000023
Extracting relaxation parameter xi from(i，1)(ii) a Two-stage decomposition of discrete wideband dielectric spectrum dielectric loss angle data from mean weighting
Figure FDA0002717980750000024
Extracting relaxation parameter xi from(i，2)(ii) a Decomposition of discrete wideband dielectric spectrum dielectric loss angle data from mean weighted four levels
Figure FDA0002717980750000025
Extracting relaxation parameter xi from(i，3)(ii) a Dispersion of broadband dielectric spectrum dielectric loss angle data from mean weighted six-fraction
Figure FDA0002717980750000026
Is prepared byRelaxation parameter xi(i，4)(ii) a The process of dielectric relaxation parameter extraction is as follows:
Figure FDA0002717980750000027
Figure FDA0002717980750000028
Figure FDA0002717980750000029
Figure FDA00027179807500000210
represents a matrix dot product;
4) and calculating a multidimensional relaxation parameter xi in the following process:
Figure FDA0002717980750000031
the third step: through the multidimensional relaxation parameter xi calculated in the second step, the following evaluation is performed:
if xi is less than theta1The insulation of the target ship cable is slightly corroded;
if xi is greater than or equal to theta1And xi is less than theta2The insulation of the target ship cable is moderate corrosion;
if xi is greater than or equal to theta2And xi is less than theta3The insulation of the target ship cable is severe corrosion;
if xi is greater than or equal to theta3The target vessel cable insulation is completely corroded.
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CN114186392A (en) * 2021-11-09 2022-03-15 西南交通大学 XLPE cable aging degree evaluation method
CN114184907A (en) * 2021-11-08 2022-03-15 西南交通大学 Rail transit cable aging degree evaluation method

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