CN112557068A - Method for testing maximum pollution resistance level of air duct of dry-type vehicle-mounted traction transformer - Google Patents
Method for testing maximum pollution resistance level of air duct of dry-type vehicle-mounted traction transformer Download PDFInfo
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- CN112557068A CN112557068A CN202011392017.8A CN202011392017A CN112557068A CN 112557068 A CN112557068 A CN 112557068A CN 202011392017 A CN202011392017 A CN 202011392017A CN 112557068 A CN112557068 A CN 112557068A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a method for testing the maximum pollution resistance grade of an air duct of a dry-type vehicle-mounted traction transformer, which comprises the following steps of: the method comprises the steps of establishing a dry type vehicle-mounted traction transformer air duct pollution resistance grade testing platform, simulating generation of air duct pollution and generation of winding of an actual dry type vehicle-mounted traction transformer by using the platform, and simultaneously obtaining temperatures of a low-voltage winding, the surface of epoxy resin and different moments in an air duct in the temperature rising process of the dry type vehicle-mounted traction transformer, so that an air duct pollution tolerance factor of the dry type vehicle-mounted traction transformer is determined, and finally the air duct pollution tolerance grade of the dry type vehicle-mounted traction transformer is evaluated. The method for testing the air duct pollution resistance level of the dry-type vehicle-mounted traction transformer can accurately evaluate the air duct pollution resistance capacity of the dry-type vehicle-mounted traction transformer and provides a basis for timely cleaning the air duct pollution of the dry-type vehicle-mounted traction transformer.
Description
Technical Field
The invention relates to a method for testing the maximum pollution resistance level of an air duct of a dry-type vehicle-mounted traction transformer, and belongs to the field of electrical insulation online monitoring and fault diagnosis.
Technical Field
The oil-immersed vehicle-mounted traction transformer is the heaviest single equipment in the traction system of the motor train unit, and the dry vehicle-mounted traction transformer cancels oil tanks of the oil-immersed vehicle-mounted traction transformer and parts such as insulating oil, so that the lightweight of the traction system of the motor train unit is realized. However, the air duct of the dry-type vehicle-mounted traction transformer is directly exposed in the air, so that in the running process of the motor train unit, inevitable dirt enters the air duct along with train wind and is adsorbed on the wall of the air duct, and the circulation of the train wind in the air duct is influenced along with the accumulation of the dirt, so that the heat dissipation performance of the dry-type vehicle-mounted traction transformer is poor. The internal insulation performance of the transformer directly influences the service life of the transformer, and the heat dissipation performance is an important influence factor of the deterioration of the insulation performance of the transformer, so that the air duct pollution of the dry-type vehicle-mounted traction transformer can be cleared timely, and the deterioration of the insulation performance of the dry-type vehicle-mounted traction transformer can be effectively slowed down. The method has the advantages that the maximum pollution tolerance level of the air duct of the dry-type vehicle-mounted traction transformer is accurately tested, and the maintenance personnel of the dry-type vehicle-mounted traction transformer can be helped to know the maximum pollution tolerance capability of the air duct of the dry-type vehicle-mounted traction transformer, so that a reasonable transformer maintenance plan is made, the air duct pollution of the dry-type vehicle-mounted traction transformer in actual operation is guaranteed to be timely cleaned, the manpower and material resources for maintaining the transformer are reduced, the economical efficiency is improved, and meanwhile, the safe and stable operation of the dry-.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a method for testing the maximum pollution resistance level of an air duct of a dry-type vehicle-mounted traction transformer, which can realize the rapid and accurate test of the maximum pollution resistance level of the air duct of the dry-type vehicle-mounted traction transformer.
The technical scheme for realizing the invention is as follows:
firstly, a dry-type vehicle-mounted traction transformer air duct pollution resistance grade test platform is built
The device comprises a low-voltage winding heat generating device (1), a high-voltage winding heat generating device (2), an epoxy resin insulating layer (3), a fan (4), a temperature sensor a (5), a temperature sensor b (6), a temperature sensor c (7), an analog power supply (8), a computer terminal (9), a pollution generator (10) and an experimental box (11); the low-voltage winding heat generating device (1) and the high-voltage winding heat generating device (2) are respectively connected with the analog power supply (8) and the computer terminal (9), and the computer terminal (9) controls the analog power supply (8) to generate currents with different sizes, so that the low-voltage winding heat generating device (1) and the high-voltage winding heat generating device (2) simulate the heating of a rated load dry-type vehicle-mounted traction transformer winding; epoxy resin insulating layers (3) are respectively poured on the surfaces of the low-voltage winding heat generating device (1) and the high-voltage winding heat generating device (2); the temperature sensor a (5) is arranged in an air duct at the outlet side of the air duct, the temperature sensor b (6) is arranged on the surface of the epoxy resin insulating layer (3) on the surface of the low-voltage winding heat generating device (1) at the outlet side of the air duct, the temperature sensor c (7) is arranged on the low-voltage winding heat generating device (1) at the outlet side of the air duct, and the three temperature sensors are all connected with a computer terminal (9); the fan (4) is used for generating wind with different wind speeds to simulate train wind corresponding to the train wind speed; a spray head of the pollution generator (10) penetrates through the top of the experiment box (11) and is used for uniformly spraying the pollution generated by the pollution generator (10) into the experiment box (11);
secondly, applying dirt in the air duct
Turning on a dirt generator (10) to uniformly spray dirt into an experimental box (11) at a speed of 10g/s, and simultaneously turning on a fan (4) to generate train wind to uniformly distribute the dirt on the surface of an epoxy resin insulation layer (3), wherein the dirt is a mixture of kieselguhr and sodium chloride with an average particle size of 30 micrometers; in the initial state, the air duct pollution grade i is 0, the air duct pollution grade i is increased by 1 grade every 30 minutes of the pollution generator (10) spraying the pollution, and the third step to the seventh step are executed every time the air duct pollution grade i is increased by one grade;
and thirdly, turning on an analog power supply (8) under an air duct pollution grade i, wherein i is 1,2 and 3 …, controlling a low-voltage winding heat generating device (1) and a high-voltage winding heat generating device (2) to simulate the heating of a low-voltage winding and a high-voltage winding when a rated load of the dry-type vehicle-mounted traction transformer is loaded, recording the temperature once every time interval delta t minutes by a temperature sensor a (5), a temperature sensor b (6) and a temperature sensor c (7), respectively recording n temperature points, and sequentially recording corresponding time points as tk，k＝1,2,…,n；
Fourthly, according to the temperature sensor a (5), the temperature sensor b (6) and the temperature sensor c (7) at different time points tkAnd (3) recording the temperature of the dry type vehicle-mounted traction transformer at the rated load of the air duct pollution grade i to obtain a polynomial corresponding to the temperature and the time t:
wherein, Tai(tk)、Tbi(tk)、Tci(tk) Respectively representing t recorded by a temperature sensor a (5), a temperature sensor b (6) and a temperature sensor c (7) at a wind channel pollution level i when the dry type vehicle-mounted traction transformer is at a rated loadkTemperature at time point, Lain(t)、Lbin(t)、Lcin(t) respectively representing a polynomial of a temperature sensor a (5), a temperature sensor b (6) and a temperature sensor c (7) when the dry type vehicle-mounted traction transformer is under a rated load at an air duct pollution level i;
and fifthly, calculating the relation of the temperature recorded by the temperature sensor a (5), the temperature sensor b (6) and the temperature sensor c (7) along with the change of time t when the dry type vehicle-mounted traction transformer is under the rated load at the air duct pollution level i:
wherein, Tai(t)、Tbi(t)、Tci(t) respectively shows the temperatures recorded by the temperature sensor a (5), the temperature sensor b (6) and the temperature sensor c (7) when the dry type vehicle-mounted traction transformer is in rated load at the air duct pollution level iRelationship of variation with time t, Lain (n)(t)、Lbin (n)(t)、Lcin (n)(t) each represents Lain(t)、Lbin(t)、Lcin(t) nth derivative of the polynomial;
sixthly, calculating an air duct pollution tolerance factor epsilon when the rated load of the dry type vehicle-mounted traction transformer is in the air duct pollution grade ii：
Wherein, Tai (n)(t)、Tbi (n)(t)、Tci (n)(T) each represents Tai(t)、Tbi(t)、Tci(t) nth derivative;
seventhly, judging the maximum pollution resistance level of the air duct of the dry-type vehicle-mounted traction transformer
If epsiloniIf the air duct pollution level is less than or equal to 1.5, the dry type vehicle-mounted traction transformer can bear the air duct pollution level i, and the second step to the seventh step are repeatedly executed; if epsiloni>And 1.5, indicating that the air duct pollution grade i-1 is the maximum air duct pollution resistance grade of the dry-type vehicle-mounted traction transformer.
The method for testing the maximum pollution resistance level of the air duct of the dry-type vehicle-mounted traction transformer has the following advantages:
according to the method, the generation of air duct pollution is simulated by establishing the air duct pollution resistance grade test platform of the dry type vehicle-mounted traction transformer and the winding heat generation of the actual dry type vehicle-mounted traction transformer, and the change relation of the temperature of the low-voltage winding, the surface of epoxy resin and the air duct in the temperature rise process of the dry type vehicle-mounted traction transformer along with time is obtained, so that the pollution tolerance factor of the dry type vehicle-mounted traction transformer is determined, and the air duct pollution tolerance grade of the dry type vehicle-mounted traction transformer is finally evaluated. The method for testing the air duct pollution resistance level of the dry-type vehicle-mounted traction transformer can quickly and accurately evaluate the maximum pollution resistance level of the air duct of the dry-type vehicle-mounted traction transformer and provide a basis for operation and maintenance personnel to make a maintenance plan of the dry-type vehicle-mounted traction transformer.
Drawings
FIG. 1 is a schematic view of a dry-type vehicle-mounted traction transformer air duct pollution resistance level testing platform according to the present invention;
figure 2 shows a flow chart of the method of the present invention.
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.
Firstly, a dry-type vehicle-mounted traction transformer air duct pollution resistance grade test platform is built
As shown in fig. 1, the device comprises a low-voltage winding heat generating device 1, a high-voltage winding heat generating device 2, an epoxy resin insulating layer 3, a fan 4, a temperature sensor a 5, a temperature sensor b 6, a temperature sensor c 7, an analog power supply 8, a computer terminal 9, a pollution generator 10 and an experimental box 11; the low-voltage winding heat generating device 1 and the high-voltage winding heat generating device 2 are respectively connected with the analog power supply 8 and the computer terminal 9, and the computer terminal 9 controls the analog power supply 8 to generate currents with different sizes, so that the low-voltage winding heat generating device 1 and the high-voltage winding heat generating device 2 simulate the heating of a rated load dry-type vehicle-mounted traction transformer winding; epoxy resin insulating layers 3 are respectively poured on the surfaces of the low-voltage winding heat generating device 1 and the high-voltage winding heat generating device 2; the temperature sensor a 5 is arranged in the air duct at the outlet side of the air duct, the temperature sensor b 6 is arranged on the surface of the epoxy resin insulation layer 3 on the surface of the low-voltage winding heat generating device 1 at the outlet side of the air duct, the temperature sensor c 7 is arranged on the low-voltage winding heat generating device 1 at the outlet side of the air duct, and the three temperature sensors are all connected with the computer terminal 9; the fan 4 is used for generating wind with different wind speeds to simulate train wind corresponding to the train wind speed; a spray head of the pollution generator 10 penetrates through the top of the experiment box 11 and is used for uniformly spraying the pollution generated by the pollution generator 10 into the experiment box 11;
secondly, applying dirt in the air duct
Turning on a dirt generator 10 to uniformly spray dirt into an experimental box 11 at a speed of 10g/s, and simultaneously turning on a fan to generate train wind to uniformly distribute the dirt on the surface of an epoxy resin insulation layer 3, wherein the dirt is a mixture of diatomite with an average particle size of 30 micrometers and sodium chloride; in the initial state, the air duct pollution grade i is 0, the air duct pollution grade i is increased by 1 grade every time the pollution generator 10 sprays the pollutants for 30 minutes, and the third step to the seventh step are executed every time the air duct pollution grade i is increased by one grade;
and thirdly, turning on an analog power supply 8 under an air duct pollution grade i, wherein i is 1,2 and 3 …, controlling the low-voltage winding heat generating device 1 and the high-voltage winding heat generating device 2 to simulate the rated load of a dry-type vehicle-mounted traction transformer with the rated capacity of 6.3MVA, and controlling the low-voltage winding and the high-voltage winding to generate heat, wherein the temperature sensor a 5, the temperature sensor b 6 and the temperature sensor c 7 record the temperature once every 2 minutes, each record obtains n is 100 temperature points, and the corresponding time points are sequentially recorded as tk，k＝1,2,…,100；
Fourthly, according to the temperature sensor a 5, the temperature sensor b 6 and the temperature sensor c 7 at different time points tkAnd (3) recording the temperature of the dry type vehicle-mounted traction transformer at the rated load of the air duct pollution grade i to obtain a polynomial corresponding to the temperature and the time t:
wherein, Tai(tk)、Tbi(tk)、Tci(tk) Respectively representing t recorded by the dry type vehicle-mounted traction transformer at rated load when the temperature sensor a 5, the temperature sensor b 6 and the temperature sensor c 7 are at the air duct pollution level ikTemperature at time point, Lain(t)、Lbin(t)、Lcin(t) each represents a temperature sensor a5. A temperature sensor b 6 and a temperature sensor c 7 are used for drying a polynomial expression of the vehicle-mounted traction transformer at a rated load in an air duct pollution level i;
fifthly, calculating the relation of the temperature recorded by the temperature sensor a 5, the temperature sensor b 6 and the temperature sensor c 7 along with the change of time t when the dry type vehicle-mounted traction transformer is under the rated load at the air duct pollution level i:
wherein, Tai(t)、Tbi(t)、Tci(t) respectively shows the relation of the temperature recorded by the temperature sensor a 5, the temperature sensor b 6 and the temperature sensor c 7 with the time t when the dry type vehicle-mounted traction transformer is in the rated load at the air duct pollution level i, and Lain (100)(t)、Lbin (100)(t)、Lcin (100)(t) each represents Lain(t)、Lbin(t)、Lcin(t) the 100 th derivative of the polynomial;
sixthly, calculating an air duct pollution tolerance factor epsilon when the rated load of the dry type vehicle-mounted traction transformer is in the air duct pollution grade ii：
Wherein, Tai (100)(t)、Tbi (100)(t)、Tci (100)(T) each represents Tai(t)、Tbi(t)、Tci(t) derivative of order 100;
seventhly, judging the maximum pollution resistance level of the air duct of the dry-type vehicle-mounted traction transformer
If epsiloniIf the air duct pollution level is less than or equal to 1.5, the dry type vehicle-mounted traction transformer can bear the air duct pollution level i, and the second step to the seventh step are repeatedly executed; if epsiloni>1.5, indicating that the air duct pollution grade i-1 is the maximum air duct pollution resistance grade of the dry-type vehicle-mounted traction transformer; sequentially calculating air duct pollution tolerance factors under the pollution grade i as follows: epsilon1＝1.23、ε2＝1.31、ε3＝1.39、ε4＝1.45、ε5＝1.49、ε61.54, wherein the maximum air duct pollution tolerance factor of the dry type vehicle-mounted traction transformer is 1.5, so the maximum air duct pollution resistance grade of the dry type vehicle-mounted traction transformer is 5.
Claims (1)
1. A method for testing the maximum pollution resistance grade of an air duct of a dry-type vehicle-mounted traction transformer is characterized by comprising the following steps:
firstly, a dry-type vehicle-mounted traction transformer air duct pollution resistance grade test platform is built
The device comprises a low-voltage winding heat generating device (1), a high-voltage winding heat generating device (2), an epoxy resin insulating layer (3), a fan (4), a temperature sensor a (5), a temperature sensor b (6), a temperature sensor c (7), an analog power supply (8), a computer terminal (9), a pollution generator (10) and an experimental box (11); the low-voltage winding heat generating device (1) and the high-voltage winding heat generating device (2) are respectively connected with the analog power supply (8) and the computer terminal (9), and the computer terminal (9) controls the analog power supply (8) to generate currents with different sizes, so that the low-voltage winding heat generating device (1) and the high-voltage winding heat generating device (2) simulate the heating of a rated load dry-type vehicle-mounted traction transformer winding; epoxy resin insulating layers (3) are respectively poured on the surfaces of the low-voltage winding heat generating device (1) and the high-voltage winding heat generating device (2); the temperature sensor a (5) is arranged in an air duct at the outlet side of the air duct, the temperature sensor b (6) is arranged on the surface of the epoxy resin insulating layer (3) on the surface of the low-voltage winding heat generating device (1) at the outlet side of the air duct, the temperature sensor c (7) is arranged on the low-voltage winding heat generating device (1) at the outlet side of the air duct, and the three temperature sensors are all connected with a computer terminal (9); the fan (4) is used for generating wind with different wind speeds to simulate train wind corresponding to the train wind speed; a spray head of the pollution generator (10) penetrates through the top of the experiment box (11) and is used for uniformly spraying the pollution generated by the pollution generator (10) into the experiment box (11);
secondly, applying dirt in the air duct
Turning on a dirt generator (10) to uniformly spray dirt into an experimental box (11) at a speed of 10g/s, and simultaneously turning on a fan (4) to generate train wind to uniformly distribute the dirt on the surface of an epoxy resin insulation layer (3), wherein the dirt is a mixture of kieselguhr and sodium chloride with an average particle size of 30 micrometers; in the initial state, the air duct pollution grade i is 0, the air duct pollution grade i is increased by 1 grade every 30 minutes of the pollution generator (10) spraying the pollution, and the third step to the seventh step are executed every time the air duct pollution grade i is increased by one grade;
and thirdly, turning on an analog power supply (8) under an air duct pollution grade i, wherein i is 1,2 and 3 …, controlling a low-voltage winding heat generating device (1) and a high-voltage winding heat generating device (2) to simulate the heating of a low-voltage winding and a high-voltage winding when a rated load of the dry-type vehicle-mounted traction transformer is loaded, recording the temperature once every time interval delta t minutes by a temperature sensor a (5), a temperature sensor b (6) and a temperature sensor c (7), respectively recording n temperature points, and sequentially recording corresponding time points as tk，k＝1,2,…,n；
Fourthly, according to the temperature sensor a (5), the temperature sensor b (6) and the temperature sensor c (7) at different time points tkAnd (3) recording the temperature of the dry type vehicle-mounted traction transformer at the rated load of the air duct pollution grade i to obtain a polynomial corresponding to the temperature and the time t:
wherein, Tai(tk)、Tbi(tk)、Tci(tk) Respectively representing t recorded by a temperature sensor a (5), a temperature sensor b (6) and a temperature sensor c (7) at a wind channel pollution level i when the dry type vehicle-mounted traction transformer is at a rated loadkTemperature at time point, Lain(t)、Lbin(t)、Lcin(t) respectively representing a polynomial of a temperature sensor a (5), a temperature sensor b (6) and a temperature sensor c (7) when the dry type vehicle-mounted traction transformer is under a rated load at an air duct pollution level i;
and fifthly, calculating the relation of the temperature recorded by the temperature sensor a (5), the temperature sensor b (6) and the temperature sensor c (7) along with the change of time t when the dry type vehicle-mounted traction transformer is under the rated load at the air duct pollution level i:
wherein, Tai(t)、Tbi(t)、Tci(t) respectively shows the relation of the temperature recorded by the temperature sensor a (5), the temperature sensor b (6) and the temperature sensor c (7) along with the change of the time t when the dry type vehicle-mounted traction transformer is under the rated load at the air duct pollution grade i, and Lain (n)(t)、Lbin (n)(t)、Lcin (n)(t) each represents Lain(t)、Lbin(t)、Lcin(t) nth derivative of the polynomial;
sixthly, calculating an air duct pollution tolerance factor epsilon when the rated load of the dry type vehicle-mounted traction transformer is in the air duct pollution grade ii：
Wherein, Tai (n)(t)、Tbi (n)(t)、Tci (n)(T) each represents Tai(t)、Tbi(t)、Tci(t) nth derivative;
seventhly, judging the maximum pollution resistance level of the air duct of the dry-type vehicle-mounted traction transformer
If epsiloniIf the air duct pollution level is less than or equal to 1.5, the dry type vehicle-mounted traction transformer can bear the air duct pollution level i, and the second step to the seventh step are repeatedly executed; if epsiloni>And 1.5, indicating that the air duct pollution grade i-1 is the maximum air duct pollution resistance grade of the dry-type vehicle-mounted traction transformer.
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