CN112557839A - Method for evaluating thermo-oxidative aging degree of ethylene propylene rubber cable of motor train unit - Google Patents
Method for evaluating thermo-oxidative aging degree of ethylene propylene rubber cable of motor train unit Download PDFInfo
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- CN112557839A CN112557839A CN202011329852.7A CN202011329852A CN112557839A CN 112557839 A CN112557839 A CN 112557839A CN 202011329852 A CN202011329852 A CN 202011329852A CN 112557839 A CN112557839 A CN 112557839A
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- ethylene propylene
- propylene rubber
- train unit
- motor train
- rubber cable
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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
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
Abstract
The invention discloses an evaluation method of the thermo-oxidative aging degree of an ethylene propylene rubber cable of a motor train unit, which is mainly suitable for the evaluation process of the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit. The method comprises the following specific steps: (1) obtaining the dielectric loss angle tangent value of the ethylene propylene rubber cable; (2) calculating the difference coefficient of the dielectric loss tangent value; (3) calculating the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit; (4) and evaluating the thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit. The invention has the beneficial effects that: the method can conveniently and quickly evaluate the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit on the premise of not damaging the cable structure, and provides reference for maintenance and replacement of the motor train unit cable.
Description
Technical Field
The invention belongs to the field of evaluation of the aging degree of an ethylene propylene rubber cable of a motor train unit, and particularly relates to an evaluation method of the thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit, which can evaluate the thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit by measuring the dielectric loss tangent value and calculating the difference coefficient and the thermal oxidation aging coefficient of the dielectric loss tangent value on the premise of not damaging the structure of the cable.
Background
The ethylene propylene rubber cable has good oxidation resistance and high temperature and humidity resistance, is widely used in motor train unit trains, and becomes an important channel for transmitting electric energy between various devices such as a railway contact system, a motor train unit vehicle-mounted transformer and the like. The thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit is directly related to the insulating property of the insulating layer of the ethylene propylene rubber cable of the motor train unit, and the method has important economic significance, social significance and scientific research value for evaluating the thermal oxidation aging state of the ethylene propylene rubber cable of the motor train unit.
The ethylene propylene rubber cable of the motor train unit is usually in a high-temperature state in the process of running along with the motor train unit, under the long-term action of the state, the ethylene propylene rubber cable of the motor train unit is inevitably subjected to thermal oxidation aging, and the ethylene propylene rubber insulating layer is the most affected. The insulation performance of the ethylene propylene rubber cable insulation layer of the motor train unit, which is subjected to thermal oxidation aging, can be reduced, even insulation breakdown can occur in severe cases, the operation safety of the motor train unit is greatly influenced, and the evaluation of the thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit has important significance for guaranteeing the safe operation of the motor train unit.
Disclosure of Invention
The dielectric loss angle tangent value of the ethylene propylene rubber cable of the motor train unit can reflect the dielectric property of the ethylene propylene rubber cable of the motor train unit under the condition that the structure of the cable is not damaged, and the invention provides an evaluation method for the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit in order to conveniently evaluate the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit.
A method for evaluating the thermo-oxidative aging degree of an ethylene propylene rubber cable of a motor train unit is characterized by comprising the following steps: carrying out dielectric parameter test on the ethylene propylene rubber cable of the motor train unit, and estimating the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit through the following steps:
the first step is as follows: obtaining the dielectric loss angle tangent value of the ethylene propylene rubber cable
The method comprises the steps of carrying out dielectric parameter tests on the ethylene propylene rubber cable of the motor train unit with the voltage value of 140V and the voltage frequencies of 0.001Hz, 0.01Hz, 0.1Hz, 1Hz, 10Hz, 100Hz and 1000Hz, and respectively marking the dielectric loss tangent values obtained by the tests as TD1、TD2、TD3、TD4、TD5、TD6、TD7；
The second step is that: calculating the coefficient of difference of the dielectric loss tangent values
Calculating the difference coefficient delta of the dielectric loss tangent value according to the formula (1):
in the formula, delta is the difference coefficient of the dielectric loss tangent value, and i is 1, 2, 3, …, 7;
the third step: calculating the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit
Calculating the thermo-oxidative aging coefficient h of the ethylene propylene rubber cable of the motor train unit according to a formula (2):
in the formula, h is the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit, and e is a natural constant;
the fourth step: thermal oxidation aging degree of ethylene propylene rubber cable of motor train unit
And evaluating the thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit according to the thermal oxidation aging coefficient h of the ethylene propylene rubber cable of the motor train unit.
The invention has the beneficial effects that: the method can conveniently and quickly evaluate the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit on the premise of not damaging the cable structure, provides reference for maintenance and replacement of the motor train unit cable, and has important reference value for guaranteeing 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 an evaluation method of the thermo-oxidative aging degree of an ethylene propylene rubber cable of a motor train unit, and fig. 1 shows a flow chart of an evaluation method of the thermo-oxidative aging degree of an ethylene propylene rubber cable of a motor train unit, which comprises the following steps:
the first step is as follows: obtaining the dielectric loss angle tangent value of the ethylene propylene rubber cable
The method comprises the steps of carrying out dielectric parameter tests on the ethylene propylene rubber cable of the motor train unit with the voltage value of 140V and the voltage frequencies of 0.001Hz, 0.01Hz, 0.1Hz, 1Hz, 10Hz, 100Hz and 1000Hz, and respectively marking the dielectric loss tangent values obtained by the tests as TD1、TD2、TD3、TD4、TD5、TD6、TD7；
The second step is that: calculating the coefficient of difference of the dielectric loss tangent values
Calculating the difference coefficient delta of the dielectric loss tangent value according to the formula (1):
in the formula, delta is the difference coefficient of the dielectric loss tangent value, and i is 1, 2, 3, …, 7;
the third step: calculating the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit
Calculating the thermo-oxidative aging coefficient h of the ethylene propylene rubber cable of the motor train unit according to a formula (2):
in the formula, h is the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit, and e is a natural constant;
the fourth step: thermal oxidation aging degree of ethylene propylene rubber cable of motor train unit
According to the thermo-oxidative aging coefficient h of the ethylene propylene rubber cable of the motor train unit, evaluating the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit as follows:
if h is more than or equal to 3, the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit is slight aging;
if h is more than or equal to 1 and is less than 3, the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit is moderate aging;
and if h is less than 1, the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit is severe aging.
Claims (1)
1. A method for evaluating the thermo-oxidative aging degree of an ethylene propylene rubber cable of a motor train unit is characterized by comprising the following steps: carrying out dielectric parameter test on the ethylene propylene rubber cable of the motor train unit, and evaluating the thermo-oxidative aging degree of the ethylene propylene rubber cable of the motor train unit through the following steps:
the first step is as follows: obtaining the dielectric loss angle tangent value of the ethylene propylene rubber cable
The method comprises the steps of carrying out dielectric parameter tests on the ethylene propylene rubber cable of the motor train unit with the voltage value of 140V and the voltage frequencies of 0.001Hz, 0.01Hz, 0.1Hz, 1Hz, 10Hz, 100Hz and 1000Hz, and respectively marking the dielectric loss tangent values obtained by the tests as TD1、TD2、TD3、TD4、TD5、TD6、TD7；
The second step is that: calculating the coefficient of difference of the dielectric loss tangent values
Calculating the difference coefficient delta of the dielectric loss tangent value according to the formula (1):
in the formula, delta is the difference coefficient of the dielectric loss tangent value, and i is 1, 2, 3, …, 7;
the third step: calculating the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit
Calculating the thermo-oxidative aging coefficient h of the ethylene propylene rubber cable of the motor train unit according to a formula (2):
in the formula, h is the thermal oxidation aging coefficient of the ethylene propylene rubber cable of the motor train unit, and e is a natural constant;
the fourth step: thermal oxidation aging degree of ethylene propylene rubber cable of motor train unit
And evaluating the thermal oxidation aging degree of the ethylene propylene rubber cable of the motor train unit according to the thermal oxidation aging coefficient h of the ethylene propylene rubber cable of the motor train unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114184845A (en) * | 2021-11-05 | 2022-03-15 | 西南交通大学 | Vehicle-mounted cable service state evaluation method based on variable-temperature dielectric performance |
| 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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| CN114184845A (en) * | 2021-11-05 | 2022-03-15 | 西南交通大学 | Vehicle-mounted cable service state evaluation method based on variable-temperature dielectric performance |
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| CN114184907A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | Rail transit cable aging degree evaluation method |
| CN114184907B (en) * | 2021-11-08 | 2022-08-05 | 西南交通大学 | Rail transit cable aging degree evaluation method |
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