CN114325182B - 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 PDFInfo
- Publication number
- CN114325182B CN114325182B CN202111558607.8A CN202111558607A CN114325182B CN 114325182 B CN114325182 B CN 114325182B CN 202111558607 A CN202111558607 A CN 202111558607A CN 114325182 B CN114325182 B CN 114325182B
- Authority
- CN
- China
- Prior art keywords
- cable
- 10kvxlpe
- temperature
- thermal
- aging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Relating To Insulation (AREA)
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
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.
During operation, the 10kVXLPE cable is always in a high-temperature state, and under the long-term action of the state, the 10kVXLPE cable is inevitably subjected to thermal-oxidative aging, wherein the rubber insulation 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 cable core and copper shielding layer, measuring current value of insulating layer of 10kVXLPE cable under three different voltages, respectively, wherein voltage value E is set to 5kV, 10kV and 20kV, and measuring to obtain current value of insulating layer, respectively denoted as I 1 ，I 2 ，I 3 ；
The third step: calculating the rate of change of temperature
Calculating the temperature-electricity change rate according to the formula (2):
in the formula, epsilon i The temperature-electricity change rate, T is the average temperature of the environment where the cable is located, E i For varying voltage values, I i To 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 (3):
wherein h is the thermo-oxidative aging coefficient, epsilon, of the 10kVXLPE cable i The rate of change of temperature and electricity obtained in the formula (2);
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 I 1 ，I 2 ，I 3 ；
The third step: calculating the rate of change of temperature
Calculating the temperature-electricity change rate according to the formula (2):
in the formula, epsilon i The temperature-electricity change rate, T is the average temperature of the environment where the cable is located, E i For varying voltage values, I i To 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 (3):
wherein h is the thermo-oxidative aging coefficient, epsilon, of the 10kVXLPE cable i The rate of change of temperature and electricity obtained in the formula (2);
the fifth step: evaluation of thermal oxidative aging degree 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 is more than 10, the thermal-oxidative aging degree of the 10kVXLPE cable is severe aging.
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 a 10kV XLPE cable, and measuring to obtain the current value
Voltage is applied between a cable core and a copper shielding layer, the current value of an insulating layer of the 10kV XLPE cable is measured under three different voltages, wherein the voltage value E is respectively set to be 5kV, 10kV and 20kV, the current value of the insulating layer is obtained through measurement and is respectively marked as I 1 ，I 2 ，I 3 ；
The third step: calculating the rate of change of temperature
Calculating the temperature-electricity change rate according to the formula (2):
in the formula, epsilon i The temperature-electricity change rate, T is the average temperature of the environment where the cable is located, E i For varying voltage values, I i To 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 (3):
wherein h is the thermo-oxidative aging coefficient, epsilon, of the 10kVXLPE cable i The rate of change of temperature and electricity obtained in the formula (2);
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 thermal-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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111558607.8A CN114325182B (en) | 2021-12-17 | 2021-12-17 | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111558607.8A CN114325182B (en) | 2021-12-17 | 2021-12-17 | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114325182A CN114325182A (en) | 2022-04-12 |
| CN114325182B true CN114325182B (en) | 2022-09-20 |
Family
ID=81051897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111558607.8A Active CN114325182B (en) | 2021-12-17 | 2021-12-17 | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114325182B (en) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3599465B2 (en) * | 1996-03-15 | 2004-12-08 | 中部電力株式会社 | Life test method for rubber and plastic cables |
| US5902962A (en) * | 1997-04-15 | 1999-05-11 | Gazdzinski; Robert F. | Cable and method of monitoring cable aging |
| CN102539964A (en) * | 2011-12-21 | 2012-07-04 | 武汉理工大学 | Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line |
| CN104678267A (en) * | 2015-02-11 | 2015-06-03 | 华南理工大学 | Method for indirectly measuring dielectric loss of insulation layer of cable |
| CN105388403B (en) * | 2015-11-09 | 2018-05-08 | 大连理工大学 | A kind of low-voltage cable remaining life quick determination method based on hardness retention rate |
| CN105548827A (en) * | 2015-12-04 | 2016-05-04 | 西安交通大学 | Non-destructive method for evaluating aging and operation state of cables |
| CN105842598A (en) * | 2016-06-14 | 2016-08-10 | 国家电网公司 | Cross-linked polyethylene cable life detection method |
| CN106771891A (en) * | 2016-11-23 | 2017-05-31 | 国网重庆市电力公司江津供电分公司 | A kind of electric heating combines aging twisted polyethylene cable residual life assessment method |
| CN209342855U (en) * | 2018-11-08 | 2019-09-03 | 国网天津市电力公司 | A kind of cable insulation status diagnostic device |
| CN109633334A (en) * | 2018-12-29 | 2019-04-16 | 广东电网有限责任公司 | A kind of electric heating combines thermal cycling ageing method, apparatus, equipment and storage medium |
| CN110208662B (en) * | 2019-06-24 | 2022-04-05 | 国网上海市电力公司 | Dielectric spectrum-based superconducting cable PPLP insulation detection method and system |
| CN211426669U (en) * | 2019-12-10 | 2020-09-04 | 苏州浪潮智能科技有限公司 | Device for monitoring power cable aging |
| CN113721111A (en) * | 2021-08-19 | 2021-11-30 | 国网北京市电力公司 | Method and device for testing aging degree of cable insulating layer |
-
2021
- 2021-12-17 CN CN202111558607.8A patent/CN114325182B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114325182A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107843817B (en) | A kind of cable insulation degradation detecting method based on polarization depolarization current method | |
| CN110736905A (en) | Insulation aging evaluation method for 110kV XLPE high-voltage cable | |
| CN106093614B (en) | A kind of method of return voltage initial slope assessment transformer insulation state | |
| CN111289863A (en) | Power cable middle joint insulation detection method based on dielectric spectrum method | |
| CN112557843B (en) | Method for evaluating aging degree of XLPE cable insulation layer water tree | |
| CN111650479A (en) | IRC (infrared radiation correlation) and electrothermal accelerated aging test method | |
| CN112557838A (en) | Method for evaluating insulation aging of XLPE cable based on polarization factor | |
| CN110618365A (en) | Low-voltage cable state evaluation method based on dielectric response characteristics | |
| CN111693826A (en) | Nuclear power cable aging degree diagnosis method | |
| CN112557839B (en) | Method for evaluating thermo-oxidative aging degree of ethylene propylene rubber cable of motor train unit | |
| CN114325182B (en) | Evaluation method for thermal-oxidative aging degree of 10kVXLPE cable based on temperature-electricity change rate | |
| CN116990621B (en) | Dynamic fault monitoring system for electric power safety tools | |
| CN110658430B (en) | XLPE cable equivalent insulation thickness estimation method for selecting PD amplitude based on standard deviation | |
| CN111812473B (en) | Method for rapidly estimating electrical service life of stator bar of high-voltage motor | |
| CN116794460A (en) | Evaluation method and system for damage degree of outer sheath of crosslinked polyethylene cable | |
| CN114186392B (en) | XLPE cable aging degree evaluation method | |
| CN111060565A (en) | High-voltage direct-current cable material resistivity characteristic evaluation method | |
| Afia et al. | Condition Assessment of XLPO Insulated Photovoltaic Cables Based on Polarisation/Depolarisation Current | |
| CN115932503A (en) | Insulation health assessment method for epoxy resin in high and low temperature environment | |
| CN111562440B (en) | Method for measuring resistivity of insulating dielectric medium based on time domain least square fitting | |
| Li et al. | The Application of Infrared Thermal Imaging Technology in State Detection of Porcelain Insulators | |
| Wang et al. | Effect of air gap defects on the electric field distribution and partial discharge characteristics of vehicle-mounted high-voltage cable terminals | |
| Yuan et al. | Aging Condition Assessment of XLPE Insulated Cables in Various Laying Environments Based on Isothermal Relaxation Current | |
| CN114184904B (en) | Method for evaluating insulation damage degree of ethylene propylene rubber cable of motor train unit | |
| CN117630608B (en) | Vehicle-mounted EPR cable insulation aging evaluation method based on force-electricity coupling parameters |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |