CN112557842B - XLPE cable aging state evaluation method based on dielectric constant evaluation factor - Google Patents
XLPE cable aging state evaluation method based on dielectric constant evaluation factor Download PDFInfo
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- CN112557842B CN112557842B CN202011329947.9A CN202011329947A CN112557842B CN 112557842 B CN112557842 B CN 112557842B CN 202011329947 A CN202011329947 A CN 202011329947A CN 112557842 B CN112557842 B CN 112557842B
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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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- 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
Abstract
The invention discloses an XLPE cable aging state evaluation method based on a dielectric constant evaluation factor, which comprises the following steps: the method comprises the steps of collecting dielectric constant test information of the crosslinked polyethylene cable, calculating a characteristic factor of a real part of the dielectric constant, calculating a characteristic factor of an imaginary part of the dielectric constant, calculating a deviation coefficient, calculating a dielectric constant evaluation factor, and determining the aging state of the cable through the dielectric constant evaluation factor. The invention has the beneficial effects that: the insulation state of the crosslinked polyethylene cable can be conveniently and efficiently evaluated by carrying out broadband dielectric spectrum test on the crosslinked polyethylene cable, acquiring dielectric constant test information and extracting a dielectric constant evaluation factor to evaluate the insulation state of the crosslinked polyethylene cable, and the power failure fault is reduced and the safe and reliable operation of a power grid is guaranteed by timely replacing the cable with a serious aging state.
Description
Technical Field
The invention belongs to the field of evaluation of an aging state of XLPE cable insulation, and particularly relates to an evaluation method of an aging state of an XLPE cable based on a dielectric constant evaluation factor.
Background
With the rapid development of the domestic urbanization process, the use amount of the power cable is greatly increased. The cross-linked polyethylene (XLPE) cable has the advantages of simple structure, strong load capacity, high mechanical strength and the like, and is widely applied to urban power distribution networks. However, the XLPE cable which runs in the power grid for a long time is poor in laying environment and running working condition, the cable is easily affected with damp and soaked or extruded, the cable is in high-voltage field intensity for a long time in the running process, the aging of the cable can be accelerated, and the power failure can be easily caused if the XLPE cable is not changed in time. Because the cable fault positioning technology is not perfect, the power supply can not be quickly recovered, which brings great influence on the life of residents and industrial production and causes great loss to national economy. Therefore, the evaluation of the aging state of the cable and the timely replacement of the seriously aged cable are important for guaranteeing the stability of power supply.
The aging state of the cable is evaluated very importantly efficiently and conveniently, so that an XLPE cable with a serious aging state can be replaced in time, the fault rate of the cable is reduced, and the safe operation of a power grid is guaranteed. Therefore, a method for effectively evaluating the aging state of the XLPE cable running in the power distribution network for a long time is urgently needed, the method is an XLPE cable aging state evaluation method based on the dielectric constant evaluation factor, the method is simple to operate, and the aging state of the cable can be effectively evaluated through the extracted dielectric constant evaluation factor.
Disclosure of Invention
The invention relates to an XLPE cable aging state evaluation method based on a dielectric constant evaluation factor, which is used for evaluating the insulation aging state of an XLPE cable running for a long time in a power distribution network.
The technical scheme of the invention is as follows:
the first step is as follows: collecting dielectric constant test information of crosslinked polyethylene cable
The dielectric constant of the crosslinked polyethylene cable is tested, and the dielectric constant collected from the crosslinked polyethylene cable is recorded as epsiloniThe value of real permittivity is represented by ∈'iAnd the value of the imaginary part of the dielectric constant is represented as ε "iI represents the data frequency point of the measured dielectric constant, i ∈ {0.01,0.02,0.03,0.1,0.2,0.3,1,2,3,10,20,30,100,200,300, 1000 };
the second step is that: calculating characteristic factor of real part of dielectric constant
Calculating a characteristic factor alpha of a real part of the dielectric constant according to the formula (1):
wherein epsilon'minIs the minimum value of the real part of the dielectric constant, ε'maxIs the maximum of the real part of the dielectric constant;
the third step: calculating the characteristic factor of imaginary part of dielectric constant
The imaginary part characteristic factor β of the dielectric constant according to equation (2):
wherein epsilon'minIs the minimum value of the imaginary part of the dielectric constant, epsilon'maxIs the maximum of the imaginary part of the dielectric constant;
the fourth step: calculating a deviation coefficient
Calculating a deviation coefficient K according to the formulas (3), (4) and (5):
wherein, represents matrix dot product of epsilon'minAnd epsilon'maxRespectively the minimum and maximum values of the real part of the dielectric constant, epsilon'minAnd epsilon'maxRespectively, the minimum value and the maximum value of the imaginary part of the dielectric constant;
the fifth step is to calculate the cable dielectric constant evaluation factor
The dielectric constant evaluation factor δ is given by equation (6):
and a sixth step: the insulation aging state of the cable is determined by the dielectric constant evaluation factor δ.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
The first step is as follows: collecting dielectric constant test information of crosslinked polyethylene cable
The dielectric constant of the crosslinked polyethylene cable is tested, and the dielectric constant collected from the crosslinked polyethylene cable is recorded as epsiloniThe value of real permittivity is represented by ∈'iAnd the value of the imaginary part of the dielectric constant is represented as ε "iI represents the data frequency point of the measured dielectric constant, i ∈ {0.01,0.02,0.03,0.1,0.2,0.3,1,2,3,10,20,30,100,200,300, 1000 };
the second step is that: calculating characteristic factor of real part of dielectric constant
Calculating a characteristic factor alpha of a real part of the dielectric constant according to the formula (1):
wherein epsilon'minIs the minimum value of the real part of the dielectric constant, ε'maxIs the maximum of the real part of the dielectric constant;
the third step: calculating the characteristic factor of imaginary part of dielectric constant
The imaginary part characteristic factor β of the dielectric constant according to equation (2):
wherein epsilon'minIs the minimum of the imaginary part of the dielectric constant，ε”maxIs the maximum of the imaginary part of the dielectric constant;
the fourth step: calculating a deviation coefficient
Calculating a deviation coefficient K according to the formulas (3), (4) and (5):
wherein, represents matrix dot product of epsilon'minAnd epsilon'maxRespectively the minimum and maximum values of the real part of the dielectric constant, epsilon'minAnd epsilon'maxRespectively, the minimum value and the maximum value of the imaginary part of the dielectric constant;
the fifth step is to calculate the cable dielectric constant evaluation factor
The dielectric constant evaluation factor δ is given by equation (6):
and a sixth step: the insulation aging state of the cable is determined by the dielectric constant evaluation factor δ.
If delta is less than 5, the insulation of the crosslinked polyethylene cable is slightly aged;
if delta is more than or equal to 5 and less than or equal to 16, the cross-linked polyethylene insulation is moderate aging;
if delta > 16, the crosslinked polyethylene insulation is severely aged.
Claims (1)
1. An XLPE cable aging state evaluation method based on a dielectric constant evaluation factor is characterized by comprising the following steps:
the first step is as follows: collecting dielectric constant test information of crosslinked polyethylene cable
The dielectric constant of the crosslinked polyethylene cable is tested, and the dielectric constant collected from the crosslinked polyethylene cable is recorded as epsiloniThe value of real permittivity is represented by ∈'iAnd the value of the imaginary part of the dielectric constant is represented as ε "iI represents the data frequency point of the measured dielectric constant, i ∈ {0.01,0.02,0.03,0.1,0.2,0.3,1,2,3,10,20,30,100,200,300, 1000 };
the second step is that: calculating characteristic factor of real part of dielectric constant
Calculating a characteristic factor alpha of a real part of the dielectric constant according to the formula (1):
wherein epsilon'minIs the minimum value of the real part of the dielectric constant, ε'maxIs the maximum of the real part of the dielectric constant;
the third step: calculating the characteristic factor of imaginary part of dielectric constant
The imaginary part characteristic factor β of the dielectric constant according to equation (2):
wherein epsilon'minIs the minimum value of the imaginary part of the dielectric constant, epsilon'maxIs the maximum of the imaginary part of the dielectric constant;
the fourth step: calculating a deviation coefficient
Calculating a deviation coefficient K according to the formulas (3), (4) and (5):
wherein, represents matrix dot product of epsilon'minAnd epsilon'maxRespectively the minimum and maximum values of the real part of the dielectric constant, epsilon'minAnd epsilon'maxRespectively, the minimum value and the maximum value of the imaginary part of the dielectric constant;
the fifth step is to calculate the cable dielectric constant evaluation factor
The dielectric constant evaluation factor δ is given by equation (6):
and a sixth step: the insulation aging state of the cable is determined by the dielectric constant evaluation factor δ.
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| CN113189443B (en) * | 2021-04-08 | 2022-03-22 | 广东工业大学 | Method for evaluating health state of high-voltage cable of motor train unit based on frequency domain complex dielectric constant |
| CN113075517A (en) * | 2021-05-10 | 2021-07-06 | 中国矿业大学 | Crosslinked polyethylene cable insulation evaluation method based on signal propagation characteristics |
| CN114184903B (en) * | 2021-11-05 | 2022-06-28 | 西南交通大学 | 10kV XLPE cable aging state evaluation method based on electric tree state evaluation factor |
| CN114184906B (en) * | 2021-11-08 | 2022-07-08 | 西南交通大学 | Crosslinked polyethylene cable insulation state evaluation method based on multi-scale aging factors |
| CN116106657B (en) * | 2022-11-18 | 2024-03-19 | 西南交通大学 | Method for evaluating ageing state of EPDM (ethylene-propylene-diene monomer) cable based on electron trap effect |
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