CN112684304B - Method for evaluating insulation state of vehicle-mounted traction transformer winding under impulse voltage - Google Patents
Method for evaluating insulation state of vehicle-mounted traction transformer winding under impulse voltage Download PDFInfo
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- CN112684304B CN112684304B CN202011391994.6A CN202011391994A CN112684304B CN 112684304 B CN112684304 B CN 112684304B CN 202011391994 A CN202011391994 A CN 202011391994A CN 112684304 B CN112684304 B CN 112684304B
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Abstract
The invention discloses an evaluation method of the insulation state of a vehicle-mounted traction transformer winding under impulse voltage, which comprises the following steps: the method comprises the steps of obtaining the average working temperature and the average annual voltage impact times of a vehicle-mounted traction transformer during operation according to the operation record of the motor train unit, determining the average leakage current under different impact voltages and impact times in the simulated operation condition, determining the impact accumulation factor of the vehicle-mounted traction transformer, further determining the voltage impact evaluation factor of the vehicle-mounted traction transformer, and finally evaluating the insulation withstand voltage impact performance of a winding of the vehicle-mounted traction transformer. According to the invention, the voltage impact resistance of the insulation of the vehicle-mounted traction transformer winding can be accurately evaluated according to the actual operation condition, and a basis is provided for the selection and evaluation of the insulation of the vehicle-mounted traction transformer winding.
Description
Technical Field
The invention belongs to the field of electric insulation on-line monitoring and fault diagnosis, and particularly relates to an evaluation method for an insulation state of a vehicle-mounted traction transformer winding under impulse voltage.
Technical Field
The vehicle-mounted traction transformer is a core component of the motor train unit, is responsible for the safe operation of the motor train unit, and has higher requirements on the safe use of the vehicle-mounted traction transformer along with the rapid development of high-speed rails and the improvement of the safe operation requirements, and the efficiency and the service life of the vehicle-mounted traction transformer are determined by the insulation condition of a winding of the vehicle-mounted traction transformer. Compared with a common power transformer, the vehicle-mounted traction transformer has a severe operating environment, and is greatly influenced by impulse voltage caused by network voltage fluctuation, regenerative braking and excessively equal operating conditions. Research shows that the range of network voltage fluctuation is 19-29 kV, the network voltage fluctuation can reach 32kV during regenerative braking, and when the network voltage fluctuation is over split phase, the impact voltage can even exceed twice rated voltage amplitude, in addition, multiple impact voltages can generate damage accumulation effect on the insulation of the vehicle-mounted traction transformer, the insulation aging can be accelerated, the insulation life can be shortened, and the safe use of the vehicle-mounted traction transformer is influenced. At present, most insulation evaluation researchers for vehicle-mounted traction transformer windings start from a thermal aging angle, convert various conditions encountered by the vehicle-mounted traction transformer into thermal aging influence on insulation, neglect damage accumulation of multiple impulse voltages on the insulation, and because the impulse voltages are high in amplitude, fast in change speed and short in action time, the damage effect of the impulse voltages on the insulation cannot be well reflected by thermal aging equivalence, so that an evaluation method for the insulation state of the vehicle-mounted traction transformer windings under the impulse voltages is urgently needed.
Disclosure of Invention
In view of the above technical problems, the invention aims to provide an evaluation method of an insulation state of a winding of a vehicle-mounted traction transformer under an impulse voltage, which can well evaluate the insulation withstand voltage impulse performance of the winding of the vehicle-mounted traction transformer.
The technical scheme for realizing the invention is as follows:
the first step is as follows: obtaining vehicle-mounted traction transformer operating parameters
Obtaining the average running environment temperature recorded as T according to the running recordmeanIn units of K; obtaining the maximum value V of the impulse voltage suffered by the vehicle-mounted traction transformer according to the operation recordmax(kV) and minimum value Vmin(kV); the average impact time per impact voltage is denoted tcSetting the value to be 10ms, and setting the time interval of two impact voltages to be 60 s; obtaining the average annual impact times of the windings of the vehicle-mounted traction transformer according to the operation records, and recording the average annual impact times as NimpactIn units of times;
the second step is that: determining a shock accumulation factor SVi
Setting m impulse voltages which are uniformly increased and respectively marked as V1、V2、V3、…、VmIn units of kV, where V1＝Vmin，Vm＝Vmax(ii) a The impulse voltage value range is Vmin～Vmax(ii) a The number of test samples of the vehicle-mounted traction transformer winding insulation material under each impact voltage is set to be 10, and the impact times of the 10 samples under each impact voltage are recorded as H1、H2、H3、…、H30The leakage current measured in time is marked as Ii,j qIn units of A, where i represents a surge voltage of ViI is 1,2,3, …, m, where q represents the surge voltage ViQ of (1), 2,3, …, 10; wherein j represents the number of impacts HjThe number of impacts is taken as
The unit is minor-]Is a rounding operation;
the voltage at surge V is obtained by the formula (1)iThe number of impacts is HjAverage leakage current I of the samplei,j；
Calculating the surge voltage V by the formula (2)iImpact accumulation factor S ofVi；
The third step: determining a voltage impact evaluation factor Cest
The average modulus length coefficient S is calculated using equation (3)Δ；
According to the obtained average module length coefficient SΔWith the impact accumulation factor S obtained in the second stepViCalculating the voltage impact evaluation factor C using equation (4)est；
The fourth step: assessment of on-board traction transformer winding insulation performance
Evaluating the insulation performance of the winding of the vehicle-mounted traction transformer under the impact voltage, and if 0 < CestIf the voltage impulse resistance is less than or equal to 0.5, the insulation withstand voltage impulse performance of the vehicle-mounted traction transformer winding is good; if 0.5 < CestIf the voltage impact resistance of the vehicle-mounted traction transformer winding is less than or equal to 1, the insulation voltage impact resistance of the vehicle-mounted traction transformer winding is medium; if CestIf the voltage is more than 1, the insulation withstand voltage impact performance of the vehicle traction transformer winding is poor, and the insulation use requirement of the vehicle traction transformer winding cannot be met;
the method for evaluating the insulation state of the winding of the vehicle-mounted traction transformer under the impulse voltage has the following advantages: the influence of factors such as temperature, impulse voltage, impulse times and the like on the insulation state of the winding of the vehicle-mounted traction transformer is comprehensively considered, the voltage impulse evaluation factor can be accurately calculated, and a way is provided for evaluating the insulation withstand voltage impulse performance of the winding of the vehicle-mounted traction transformer.
Drawings
Fig. 1 shows a flow chart of a method for evaluating the insulation state of a winding of a traction transformer on board a vehicle under surge voltage.
Detailed Description
The invention is further described with reference to the accompanying drawings and the specific implementation procedures. It should be emphasized that the embodiments described herein are merely illustrative of the invention and do not limit the scope of the inventive concept and its claims.
The first step is as follows: obtaining vehicle-mounted traction transformer operating parameters
Obtaining the average running environment temperature recorded as T according to the running recordmeanIts value is 365K; obtaining the maximum value V of the impulse voltage suffered by the vehicle-mounted traction transformer according to the operation recordmaxIs 50kV and a minimum value VminIs 35 kV; the average impact time per impact voltage is denoted tcSetting the value to be 10ms, and setting the time interval of two impact voltages to be 60 s; obtaining the average annual impact times of the windings of the vehicle-mounted traction transformer according to the operation records, and recording the average annual impact times as NimpactThe value is 400 times;
the second step is that: determining a shock accumulation factor SVi
Setting m impulse voltages which are uniformly increased and respectively marked as V1、V2、V3、…、VmIn units of kV, where V1＝Vmin，Vm＝Vmax(ii) a The impulse voltage value range is Vmin～Vmax(ii) a The number of test samples of the vehicle-mounted traction transformer winding insulation material under each impact voltage is set to be 10, and the impact times of the 10 samples under each impact voltage are recorded as H1、H2、H3、…、H30The leakage current measured in time is marked as Ii,j qIn units of A, where i represents a surge voltage of ViI is 1,2,3, …, m, where q represents the surge voltage ViQ of (1), 2,3, …, 10; wherein j represents the number of impacts HjThe number of impacts is taken as
The unit is minor-]Is a rounding operation;
the voltage at surge V is obtained by the formula (1)iThe number of impacts is HjAverage leakage current I of the samplei,j；
Calculating the surge voltage V by the formula (2)iImpact accumulation factor S ofVi；
The third step: determining a voltage impact evaluation factor Cest
The average modulus length coefficient S is calculated using equation (3)Δ；
According to the obtained average module length coefficient SΔWith the impact accumulation factor S obtained in the second stepViCalculating the voltage impact evaluation factor C using equation (4)est；
The fourth step: assessment of on-board traction transformer winding insulation performance
Calculating to obtain a voltage impact evaluation factor Cest0.2, the vehicle-mounted traction transformer winding has good insulation voltage impact resistance.
Claims (1)
1. A method for evaluating the insulation state of a winding of a vehicle traction transformer under surge voltage is characterized by comprising the following steps:
the first step is as follows: acquiring running parameters of a vehicle-mounted traction transformer;
the second step is that: determining a shock accumulation factor SVi；
The third step: determining a voltage impact evaluation factor Cest；
The fourth step: evaluating the insulation withstand voltage impact performance of a winding of the vehicle-mounted traction transformer;
the specific process of the first step is as follows:
obtaining the average running environment temperature recorded as T according to the running recordmeanIn units of K; obtaining the maximum value V of the impulse voltage suffered by the vehicle-mounted traction transformer according to the operation recordmax(kV) and minimum value Vmin(kV); the average impact time per impact voltage is denoted tcSetting the value to be 10ms, and setting the time interval of two impact voltages to be 60 s; obtaining the average annual impact times of the windings of the vehicle-mounted traction transformer according to the operation records, and recording the average annual impact times as NimpactIn units of times;
the specific process of the second step is as follows:
setting m impulse voltages which are uniformly increased and respectively marked as V1、V2、V3、…、VmIn units of kV, where V1＝Vmin，Vm＝Vmax(ii) a The impulse voltage value range is Vmin～Vmax(ii) a The number of test samples of the vehicle-mounted traction transformer winding insulation material under each impact voltage is set to be 10, and the impact times of the 10 samples under each impact voltage are recorded as H1、H2、H3、…、H30The leakage current measured in time is marked as Ii,j qIn units of A, where i represents a surge voltage of ViI is 1,2,3, …, m, where q represents the surge voltage ViQ of (1), 2,3, …, 10; wherein j represents the number of impacts HjThe number of impacts is taken as
The unit is minor-]Is a rounding operation;
the voltage at surge V is obtained by the formula (1)iThe number of impacts is HjAverage leakage current I of the samplei,j；
Calculating the surge voltage V by the formula (2)iImpact accumulation factor S ofVi；
The third step comprises the following specific processes:
the average modulus length coefficient S is calculated using equation (3)Δ；
According to the obtained average module length coefficient SΔWith the impact accumulation factor S obtained in the second stepViCalculating the voltage impact evaluation factor C using equation (4)est；
The fourth step comprises the following specific processes:
evaluating the insulation performance of the winding of the vehicle-mounted traction transformer under the impact voltage, and if 0 < CestIf the voltage impulse resistance is less than or equal to 0.5, the insulation withstand voltage impulse performance of the vehicle-mounted traction transformer winding is good; if 0.5 < CestIf the voltage impact resistance of the vehicle-mounted traction transformer winding is less than or equal to 1, the insulation voltage impact resistance of the vehicle-mounted traction transformer winding is medium; if CestIf the voltage is more than 1, the insulation withstand voltage impact performance of the vehicle traction transformer winding is poor, and the use requirement of the vehicle traction transformer winding insulation can not be met.
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| CN114166731B (en) * | 2021-10-22 | 2022-07-19 | 西南交通大学 | A method for evaluating the resistance performance of epoxy resin layer of dry-type on-board traction transformer |
| CN116125147B (en) * | 2022-11-22 | 2024-01-16 | 西南交通大学 | An evaluation method for dry-type transformer insulation materials in high-temperature and high-humidity environments |
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