CN113189455B - Motor train unit high-voltage cable defect degree evaluation method based on local discharge amount difference - Google Patents
Motor train unit high-voltage cable defect degree evaluation method based on local discharge amount difference Download PDFInfo
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- CN113189455B CN113189455B CN202110360594.7A CN202110360594A CN113189455B CN 113189455 B CN113189455 B CN 113189455B CN 202110360594 A CN202110360594 A CN 202110360594A CN 113189455 B CN113189455 B CN 113189455B
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- 238000012854 evaluation process Methods 0.000 claims description 3
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a method for evaluating the defect degree of a high-voltage cable of a motor train unit based on local discharge quantity difference, which comprises the following steps of: s1: acquiring partial discharge information of a high-voltage cable of the tested motor train unit through two different test voltages; s2: calculating the difference coefficient of the partial discharge capacity under the two test voltages; s3: and evaluating the defect degree of the tested high-voltage cable according to the preset standard of the difference coefficient of the local discharge amount. According to the invention, the partial discharge information of the high-voltage cable of the motor train unit under different test voltages is utilized to further calculate the discharge difference coefficient, the defect degree of the high-voltage cable of the motor train unit is qualitatively evaluated according to the preset evaluation standard, a judgment basis is provided for the maintenance and replacement of the motor train unit cable, and the method has an important reference value for guaranteeing the safe operation of the motor train unit.
Description
Technical Field
The invention relates to the technical field of high-voltage cable evaluation of motor train units, in particular to a method for evaluating defect degree of high-voltage cables of motor train units based on local discharge amount difference.
Background
As important traction power supply equipment, the high-voltage cable of the motor train unit needs to have extremely high reliability. However, due to the differences in manufacturing processes and the complexity of the installation process, some hidden defects are inevitably present in the cable, and the degree of defects changes with time during long-term operation. The electrical performance of the high-voltage cable of the motor train unit with the aggravated defect degree is inevitably influenced, and the safe operation of the motor train unit can be damaged due to the continuous deterioration of the defect degree.
In order to accurately and efficiently evaluate the defect degree of the high-voltage cable of the motor train unit, a method capable of evaluating the defect degree of the high-voltage cable of the motor train unit is needed.
In the prior art, a chinese patent publication No. CN105334439A discloses a method and a system for detecting a cable partial discharge concentration point in 2016, 2, 17, that is, a cable to be detected is divided into a plurality of statistical intervals, and if the number of partial discharge points in the statistical intervals is not less than a preset relative threshold of discharge points, the number of partial discharge points in the statistical intervals, in which the partial discharge amount is greater than the preset relative threshold of discharge amount, is counted; and when the number of the partial discharge points with the partial discharge amount larger than the relative threshold of the preset discharge amount exceeds the absolute threshold of the number of the preset discharge points, judging that a partial discharge concentration point occurs in the statistical interval, acquiring the position of the partial discharge concentration point as the gravity center of the position of the partial discharge point with the partial discharge amount larger than the relative threshold of the preset discharge amount in the statistical interval, and otherwise, judging that no partial discharge concentration point exists in the statistical interval. The scheme is used for detecting partial discharge of the power transmission and transformation line, and does not relate to defect evaluation of cables.
Disclosure of Invention
The invention provides a method for evaluating the defect degree of a high-voltage cable of a motor train unit based on local discharge amount difference, which aims to overcome the defect that the method for evaluating the defect of the high-voltage cable of the motor train unit in the prior art is not accurate and efficient enough.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
the invention provides a method for evaluating the defect degree of a high-voltage cable of a motor train unit based on local discharge quantity difference, which comprises the following steps of:
s1: acquiring partial discharge information of a high-voltage cable of the tested motor train unit through two different test voltages;
s2: calculating the difference coefficient of the partial discharge capacity under the two test voltages;
s3: and evaluating the defect degree of the tested high-voltage cable according to the preset standard of the difference coefficient of the local discharge amount.
Further, the specific process of step S1 is:
carrying out 2 times of partial discharge tests on the high-voltage cable of the motor train unit to be tested, wherein each time of test is n minutes, the first time of test voltage is the rated voltage of the cable to be tested, the second time of test voltage is 1.5 times of the rated voltage of the cable to be tested, the test time is divided into 60n time periods at equal intervals of 10 seconds, each time period is marked as i, 1, 2, 3, 60 and 60n are taken as i, and the maximum discharge capacity a in each time period of the first test is recorded as aiThe unit is pC (Pikukukura), and the maximum discharge amount in each time period of the second test is recorded as biThe unit is pC (Pikukura).
Further, each test time n has a value of 5.
Further, the partial discharge amount difference coefficient is represented as δ, and the calculation formula is:
further, the specific evaluation process of step S3 is as follows:
if delta is larger than 0.87, the high-voltage cable of the motor train unit to be tested has light defects;
if delta is larger than 0.71 and smaller than or equal to 0.87, the high-voltage cable of the motor train unit to be tested is a medium defect;
if delta is less than or equal to 0.71, the high-voltage cable of the motor train unit to be tested is a severe defect.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the partial discharge information of the high-voltage cable of the motor train unit under different test voltages is utilized to further calculate the discharge difference coefficient, the defect degree of the high-voltage cable of the motor train unit is qualitatively evaluated according to the preset evaluation standard, a judgment basis is provided for the maintenance and replacement of the motor train unit cable, and the method has an important reference value for guaranteeing the safe operation of the motor train unit.
Drawings
FIG. 1 is a flow chart of a method for evaluating the defect degree of a high-voltage cable of a motor train unit based on the difference of partial discharge amount.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in FIG. 1, the invention provides a method for evaluating the defect degree of a high-voltage cable of a motor train unit based on local discharge amount difference, which comprises the following steps:
s1: acquiring partial discharge information of a high-voltage cable of the tested motor train unit through two different test voltages;
the specific process is as follows:
carrying out 2 times of partial discharge tests on the high-voltage cable of the tested motor train unit, wherein each time of the test is 5 minutes, the first time of the test is rated voltage of the tested cable, the second time of the test is 1.5 times rated voltage of the tested cable, the test time is divided into 30 time periods at equal intervals of 10 seconds, each time period is marked as i, 1, 2, 3, 30 is taken as i, and the maximum discharge capacity a in each time period of the first test is recordediThe unit is pC (Pikukukura), and the maximum discharge amount in each time period of the second test is recorded as biThe unit is pC (Pikukura).
S2: calculating the difference coefficient of the partial discharge capacity under the two test voltages;
the partial discharge quantity difference coefficient is recorded as delta, and the calculation formula is as follows:
s3: and evaluating the defect degree of the tested high-voltage cable according to the preset standard of the difference coefficient of the local discharge amount.
The specific evaluation process of step S3 is:
if delta is larger than 0.87, the high-voltage cable of the motor train unit to be tested has light defects;
if delta is larger than 0.71 and smaller than or equal to 0.87, the high-voltage cable of the motor train unit to be tested is a medium defect;
if delta is less than or equal to 0.71, the high-voltage cable of the motor train unit to be tested is a severe defect.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (1)
1. A method for evaluating the defect degree of a high-voltage cable of a motor train unit based on local discharge quantity difference is characterized by comprising the following steps of:
s1: acquiring partial discharge information of a high-voltage cable of the tested motor train unit through two different test voltages;
the specific process is as follows:
carrying out 2 times of partial discharge tests on the high-voltage cable of the tested motor train unit, wherein each time of the test is 5 minutes, the first time of the test is rated voltage of the tested cable, the second time of the test is 1.5 times rated voltage of the tested cable, the test time is divided into 30 time periods at equal intervals of 10 seconds, each time period is marked as i, 1, 2, 3, 30 is taken as i, and the maximum discharge capacity a in each time period of the first test is recordediThe unit is pC (Pikukuai), and the maximum discharge capacity in each time period of the second test is recorded as bipC (Pikura);
s2: calculating the difference coefficient of the partial discharge capacity under the two test voltages;
the partial discharge quantity difference coefficient is recorded as delta, and the calculation formula is as follows:
s3: evaluating the defect degree of the tested high-voltage cable according to the preset standard of the difference coefficient of the local discharge amount;
the specific evaluation process of step S3 is:
if delta is larger than 0.87, the high-voltage cable of the motor train unit to be tested has light defects;
if delta is larger than 0.71 and smaller than or equal to 0.87, the high-voltage cable of the motor train unit to be tested is a medium defect;
if delta is less than or equal to 0.71, the high-voltage cable of the motor train unit to be tested is a severe defect.
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| CN113625136B (en) * | 2021-08-10 | 2023-10-31 | 国网福建省电力有限公司漳州供电公司 | Multi-stage discharge coefficient-based power distribution network 6kV cable aging state evaluation method |
| CN114184904B (en) * | 2021-11-05 | 2022-07-08 | 西南交通大学 | Method for evaluating insulation damage degree of ethylene propylene rubber cable of motor train unit |
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