CN114325182A - Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate - Google Patents

Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate Download PDF

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Publication number
CN114325182A
CN114325182A CN202111558607.8A CN202111558607A CN114325182A CN 114325182 A CN114325182 A CN 114325182A CN 202111558607 A CN202111558607 A CN 202111558607A CN 114325182 A CN114325182 A CN 114325182A
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cable
10kvxlpe
temperature
aging
thermal
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CN114325182B (en
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郭蕾
张祥宇
穆强
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Southwest Jiaotong University
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Southwest Jiaotong University
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Abstract

The invention discloses a method for evaluating the thermal-oxygen aging degree of a 10kVXLPE cable based on a temperature-electricity change rate, which is mainly suitable for the evaluation process of the thermal-oxygen aging degree of the 10kVXLPE cable. The method comprises the following specific steps: (1) obtaining the average value of the temperature of the environment where the 10kVXLPE cable is located; (2) changing the voltage of the 10kVXLPE cable, and measuring the current value of the cable; (3) calculating the temperature-electricity change rate of the 10kVXLPE cable; (4) the 10kVXLPE cable was evaluated for thermo-oxidative aging. The invention has the beneficial effects that: the method can be more convenient and faster, complete the thermal oxidation aging evaluation work of the 10kVXLPE cable, and achieve the condition of not damaging the cable structure.

Description

Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate
Technical Field
The invention belongs to the field of evaluation of the aging degree of a 10kVXLPE cable, and particularly relates to a method for evaluating the thermal oxidation aging degree of the 10kVXLPE cable based on a temperature-electricity change rate, which can evaluate the thermal oxidation aging degree of the 10kVXLPE cable by measuring the temperature, the electric field intensity and the electric conductivity and calculating the temperature-electricity change rate on the premise of not damaging the structure of the cable.
Background
The safe and stable operation of the 10kVXLPE cable is of great importance to the whole power system, and once a fault occurs, large-area power failure is caused, so that certain economic loss is caused. The thermal oxidation aging degree of the 10kVXLPE cable is directly related to the insulating property of the 10kVXLPE cable insulating layer, and the thermal oxidation aging degree evaluation method has important economic significance, social significance and scientific research value for the thermal oxidation aging state evaluation of the 10kVXLPE cable.
The 10kVXLPE cable is in a high-temperature state during operation, and under the long-term action of the state, the 10kVXLPE cable is inevitably subjected to thermal-oxidative aging, wherein the rubber insulating layer is most influenced. The insulating property of the 10kVXLPE cable insulating layer which generates thermal oxidation aging can be reduced, even insulation breakdown can occur in severe cases, the operation safety of the motor car is greatly influenced, and the evaluation of the thermal oxidation aging degree of the 10kVXLPE cable has important significance for guaranteeing the safe operation of the motor car.
Disclosure of Invention
The temperature-electricity change rate of the 10kVXLPE cable can reflect the dielectric property of the cable without damaging the structure of the cable, and in order to conveniently evaluate the thermal-oxygen aging degree of the 10kVXLPE cable, the invention provides a method for evaluating the thermal-oxygen aging degree of the 10kVXLPE cable based on the temperature-electricity change rate
The method is an evaluation method of the thermo-oxidative aging degree of the 10kVXLPE cable based on the temperature-electricity change rate, and is characterized in that: the 10kVXLPE cable is tested for temperature, electric field intensity and electric conductivity, and the thermo-oxidative aging degree of the 10kVXLPE cable is estimated by the following steps:
the first step is as follows: measuring the mean value of the temperature of the environment where the cable is located
Measuring the environmental temperature of the cable every two hours within 24 hours a day, and after data are summarized, calculating the average value of all twelve data to serve as the temperature value T of the whole cable;
the second step is that: changing the voltage of the 10kVXLPE cable, and measuring to obtain the current value
Applying voltage between the cable core and the copper shielding layer, measuring the current value of the insulating layer of the 10kVXLPE cable under three different voltages, wherein the voltage value E is respectively set to 5kV, 10kV and 20kV, and the current value of the insulating layer is obtained through measurement and is respectively marked as I1,I2,I3
The third step: calculating the rate of change of temperature
Calculating the temperature-electricity change rate according to the formula (2):
in the formula, epsiloniThe temperature change rate, T is the temperature of the environment where the cable is located, EiFor varying voltage values, IiTo test the resulting current, i is taken to be 1, 2, 3, e is a natural constant;
the fourth step: calculating the thermal oxidation aging coefficient of the 10kVXLPE cable
Calculating the thermal oxidation aging coefficient h of the 10kVXLPE cable according to the formula (2):
in the formula, h is the thermal oxidation aging coefficient of the 10kVXLPE cable;
the fifth step: evaluation of thermal oxidative aging of 10kVXLPE Cable
Evaluating the thermal-oxidative aging degree of the 10kVXLPE cable according to the thermal-oxidative aging coefficient h of the 10kVXLPE cable;
if h is more than 0 and less than or equal to 6, the thermo-oxidative aging degree of the 10kVXLPE cable is slight aging;
if h is more than 6 and less than or equal to 10, the thermo-oxidative aging degree of the 10kVXLPE cable is moderate aging;
if h > 10, the thermo-oxidative ageing degree of the 10kVXLPE cable is severe.
The invention has the beneficial effects that: the method can conveniently and quickly evaluate the thermal oxidation aging degree of the 10kVXLPE cable on the premise of not damaging the cable structure, provides reference for the maintenance and replacement of the cable of the motor train unit, and has important reference value for guaranteeing the safe operation of the motor train unit.
Drawings
FIG. 1 is a flow chart of the present invention
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a flow chart of a method for evaluating the thermal oxidation aging degree of a 10kVXLPE cable based on a temperature-electricity change rate, and fig. 1 shows a flow chart of a method for evaluating the thermal oxidation aging degree of a 10kVXLPE cable based on a temperature-electricity change rate, which comprises the following steps:
the first step is as follows: measuring the mean value of the temperature of the environment where the cable is located
Measuring the environmental temperature of the cable every two hours within 24 hours a day, and after data are summarized, calculating the average value of all twelve data to serve as the temperature value T of the whole cable;
the second step is that: changing the voltage of the 10kVXLPE cable, and measuring to obtain the current value
Applying voltage between the cable core and the copper shielding layer, measuring the current value of the insulating layer of the 10kVXLPE cable under three different voltages, wherein the voltage value E is respectively set to 5kV, 10kV and 20kV, and the current value of the insulating layer is obtained through measurement and is respectively marked as I1,I2,I3
The third step: calculating the rate of change of temperature
Calculating the temperature-electricity change rate according to the formula (2):
in the formula, epsiloniThe temperature change rate, T is the temperature of the environment where the cable is located, EiFor varying voltage values, IiTo test the resulting current, i is taken to be 1, 2, 3, e is a natural constant;
the fourth step: calculating the thermal oxidation aging coefficient of the 10kVXLPE cable
Calculating the thermal oxidation aging coefficient h of the 10kVXLPE cable according to the formula (2):
in the formula, h is the thermal oxidation aging coefficient of the 10kVXLPE cable;
the fifth step: evaluation of thermal oxidative aging of 10kVXLPE Cable
Evaluating the thermal-oxidative aging degree of the 10kVXLPE cable according to the thermal-oxidative aging coefficient h of the 10kVXLPE cable;
if h is more than 0 and less than or equal to 6, the thermo-oxidative aging degree of the 10kVXLPE cable is slight aging;
if h is more than 6 and less than or equal to 10, the thermo-oxidative aging degree of the 10kVXLPE cable is moderate aging;
if h > 10, the thermo-oxidative ageing degree of the 10kVXLPE cable is severe.

Claims (1)

1. A method for evaluating the thermo-oxidative aging degree of a 10kVXLPE cable based on a temperature-electricity change rate is characterized by comprising the following steps: the 10kVXLPE cable was subjected to temperature and electric field tests and the degree of thermo-oxidative aging of the 10kVXLPE cable was evaluated by the following steps:
the first step is as follows: measuring the mean value of the temperature of the environment where the cable is located
Measuring the environmental temperature of the cable every two hours within 24 hours a day, and after data are summarized, calculating the average value of all twelve data to serve as the temperature value T of the whole cable;
the second step is that: changing the voltage of the 10kVXLPE cable, and measuring to obtain the current value
Applying voltage between the cable core and the copper shielding layer, measuring the current value of the insulating layer of the 10kVXLPE cable under three different voltages, wherein the voltage value E is respectively set to 5kV, 10kV and 20kV, and the current value of the insulating layer is obtained through measurement and is respectively marked as I1,I2,I3
The third step: calculating the rate of change of temperature
Calculating the temperature-electricity change rate according to the formula (2):
in the formula, epsiloniThe temperature change rate, T is the temperature of the environment where the cable is located, EiFor varying voltage values, IiTo test the resulting current, where i takes 1,2, 3 and e are natural constants;
the fourth step: calculating the thermal oxidation aging coefficient of the 10kVXLPE cable
Calculating the thermal oxidation aging coefficient h of the 10kVXLPE cable according to the formula (2):
in the formula, h is the thermal oxidation aging coefficient of the 10kVXLPE cable;
the fifth step: evaluation of thermal oxidative aging of 10kVXLPE Cable
Evaluating the thermal-oxidative aging degree of the 10kVXLPE cable according to the thermal-oxidative aging coefficient h of the 10kVXLPE cable;
if h is more than 0 and less than or equal to 6, the thermo-oxidative aging degree of the 10kVXLPE cable is slight aging;
if h is more than 6 and less than or equal to 10, the thermo-oxidative aging degree of the 10kVXLPE cable is moderate aging;
if h > 10, the thermo-oxidative ageing degree of the 10kVXLPE cable is severe.
CN202111558607.8A 2021-12-17 2021-12-17 Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate Active CN114325182B (en)

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