CN108061826A - The method of inspection of large-scale rewinding material tractive transformer winding technological effect - Google Patents
The method of inspection of large-scale rewinding material tractive transformer winding technological effect Download PDFInfo
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- 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
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a kind of methods of inspection of large-scale rewinding material tractive transformer winding technological effect, mainly include the following steps：1) sampling is examined；2) verification test；3) characteristic parameter extraction；4) technological effect is examined.Pass through the method for inspection of large-scale rewinding material tractive transformer winding technological effect provided by the invention, large-scale rewinding material tractive transformer large size winding technique technological effect can be effectively examined, a kind of judging basis are provided for the large-scale rewinding material tractive transformer large size winding technique technique of optimization.
Description
Technical Field
The invention belongs to the field of processing technologies of wound core traction transformers, and particularly relates to a method for testing the winding technological effect of a large-scale wound core traction transformer.
Background
The traction transformer is a key device of a traction power supply system, the performance of the traction transformer directly influences whether an electrified railway system can normally operate, and the coiled iron core has the advantages of lower loss, lower noise and the like compared with a laminated iron core due to the special coiling characteristic of the coiled iron core and the reason that the mechanical stress of a silicon steel strip is eliminated through an annealing process, and with the successful development of the traction transformer of the first coiled iron core in 2013, the large-scale coiled iron core transformer is gradually popularized and applied in the railway system.
In the large-scale iron core traction transformer production process of rolling up, its winding coiling mode is different from ordinary transformer, must directly coil on the core limb in whole coiling process, rather than assembling of later stage core limb, winding coil, and the winding mode is: the method comprises the steps of putting an iron core in place on a winding station of a special winding machine, installing a winding gear, installing a winding inner die, adhering a paper tube in a traction coil, starting to wind the traction coil, installing an insulating piece between the traction coil and a positive feed coil, adhering the paper tube in the positive feed coil, winding the positive feed coil, installing a main hollow channel insulating piece, adhering the paper tube in a high-voltage coil, winding the high-voltage coil, pulling out the winding inner die, removing the winding gear, and finally, punching a stay between the iron core and the coil to complete the winding work of the whole-column coil. However, at present, there is no method capable of effectively inspecting the winding process effect of the large winding of the large wound core traction transformer, so that a basis is provided for process effect evaluation in order to optimize the winding process of the large winding of the large wound core traction transformer, and an inspection method for the winding process effect of the large wound core traction transformer is urgently needed.
Disclosure of Invention
In order to more reliably and effectively inspect the insulation process of the large winding of the wound core traction transformer, the invention provides an inspection method for the winding process effect of the large wound core traction transformer, which comprises the following steps:
the first step is as follows: inspection sampling
Sampling large wound core traction transformers produced on the same production line, wherein the total number of samples is recorded as N, and numbering the extracted large wound core traction transformers to be inspected, wherein the numbers are recorded as 1,2,3, … … and N;
the second step is that: test for inspection
The extracted large-scale wound core traction transformer (No. 1,2,3, … …, N) is subjected to inspection and test one by one, and the specific test steps are as follows:
2.1 test preparation and test connections
The method comprises the steps that a high-voltage winding wire inlet end of a wound core traction transformer is in short circuit with a high-voltage winding wire outlet end, then the wound core traction transformer is connected with a voltage output end of a frequency domain dielectric spectrum tester, a low-voltage winding wire inlet end of the wound core traction transformer is in short circuit with a low-voltage winding wire outlet end, then the wound core traction transformer is connected with a voltage input end of the frequency domain dielectric spectrum tester, and the environment temperature is tested and recorded as T (centigrade);
2.2 frequency-Domain dielectric Spectroscopy testing
Setting the output voltage to 1400 volts, setting the test frequency range to be 1 kHz-1 mHz, starting a frequency domain dielectric spectrum tester to perform frequency domain dielectric spectrum test on the wound core traction transformer to obtain a frequency domain dielectric spectrum of a relative complex dielectric constant real part (epsilon ') and a relative complex dielectric constant imaginary part (epsilon') at an ambient temperature T (centigrade);
2.3 frequency domain dielectric spectrum test result reduction
The frequency domain dielectric spectrum of the real part (epsilon ') of the relative complex dielectric constant of the insulation in the traction transformer at the ambient temperature T measured in the step 2.2 is reduced to the reference temperature of 15 ℃ according to the formula (1), and the frequency domain dielectric spectrum of the imaginary part (epsilon') of the relative complex dielectric constant of the insulation in the wound core transformer at the ambient temperature T measured in the step 2.2 is reduced to the reference temperature of 15 ℃ according to the formula (2)
In the formula (f) T The test frequencies of the frequency domain dielectric spectrum at the ambient temperature T (including 1mHz,2.15mHz,4.64mHz,0.01Hz,0.02154Hz,0.04642Hz,0.1Hz,0.21544Hz,0.46416Hz,1Hz,2.1544Hz,4.6416Hz,10Hz,20Hz,42Hz,60Hz,90Hz,220Hz,470Hz, 1000Hz), f 15℃ Is f T F in the formulae (1) and (2) at a frequency corresponding to a reference temperature of 15 DEG C T /f 15℃ The following expression is given:
obtaining a frequency domain dielectric spectrum curve of a real part (epsilon ') of the complex dielectric constant and an imaginary part (epsilon') of the relative complex dielectric constant at the reference temperature of 15 ℃ by performing polynomial fitting on the test result after being reduced to the reference temperature of 15 ℃;
the third step: feature parameter extraction
And (3) extracting characteristic parameters one by one according to the test result of the extracted large-scale wound core traction transformer (No. 1,2,3, … …, N): by adopting the expressions of epsilon 'and epsilon' shown in the formulas (4) and (5), based on the frequency domain dielectric spectrum of epsilon 'and epsilon' of the insulation in the wound core traction transformer at the reference temperature of 15 ℃ obtained in the second step, MATLAB is used for fitting by a nonlinear least square method, and then characteristic parameters (sigma) dc ，Δε 1 ，Δε 2 ，τ 1 ，τ 2 ) In order to ensure the uniqueness and accuracy of the model parameter fitting result during fitting, the value (6) is used as an objective function, when the error sum of squares theta is minimum, the fitting is considered to be effective, and the characteristic parameter values of the extracted large-sized wound core traction transformer (1,2,3, … …, no. N) are sequentially recorded as (sigma) dc_1 ，Δε 1_1 ，Δε 2_1 ，τ 1_1 ，τ 2_1 )，(σ dc_2 ，Δε 1_2 ，Δε 2_2 ，τ 1_2 ，τ 2_2 )，(σ dc_3 ，Δε 1_3 ，Δε 2_3 ，τ 1_3 ，τ 2_3 )，……，(σ dc_N ，Δε 1_N ，Δε 2_N ，τ 1_N ，τ 2_N )；
In the formula, σ dc Is direct current conductivity, Δ ε 1 Relaxation intensity of interface polarization, Δ ε 2 Relaxation intensity, τ, for dipole-steered polarization 1 Relaxation time, τ, for interfacial polarization 2 Relaxation time, alpha, for dipole-steering polarization 1 Distribution parameter of interfacial polarization, alpha 2 Is a distribution parameter of dipole steering polarization, omega is an angular frequency, epsilon' fit (ω) is the fitting value, ε ″) fit (ω) is a test value, and when the parameter extraction process uses MATLAB to perform parameter fitting by a nonlinear least squares method, the boundary constraint conditions are as follows: high frequency dielectric constant 0<ε ∞ < 10, DC conductance 10 -11 <σ dc <10 -4 Interfacial polarization relaxation Strength 0.1<Δε 1 < 400, interfacial polarization relaxation time 10<τ 1 &10000, dipole polarization relaxation intensity of 0.1<Δε 2 < 20 dipole turn polarization relaxation time 10 -12 <τ 2 <10 -6 Distribution parameter 0<α 1 、α 2 <1；
The fourth step: effect test of large winding insulation process for wound core traction transformer
Calculating a detection coefficient H through the formula (4), if the detection coefficient H is larger than a standard value k, the large winding insulation process of the wound core traction transformer is unqualified, and if the detection coefficient H is smaller than or equal to the standard value k, the large winding insulation process of the wound core traction transformer is qualified, and the value k is set according to production requirements;
h in the formula (7) 1 For a characteristic parameter σ dc Checking coefficient of (H) 2 Is a characteristic parameter Δ ε 1 Checking coefficient of (H) 3 Is a characteristic parameter Δ ε 2 Checking coefficient of (H) 4 For a characteristic parameter τ 1 Checking coefficient of (H) 5 For a characteristic parameter τ 2 Checking coefficient of (H) 1 To H 5 The specific calculation method is as follows:
the method for testing the winding process effect of the large-scale wound core traction transformer can effectively test the winding process effect of the large-scale wound core traction transformer, and provides a judgment basis for optimizing the winding process of the large-scale wound core traction transformer.
Drawings
FIG. 1 is a flow chart of a method for inspecting the winding effect of a large-scale wound core traction transformer.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a flowchart of a method for inspecting the winding process effect of a large-scale wound core traction transformer, and it can be seen from fig. 1 that the method for inspecting the winding process effect of the large-scale wound core traction transformer comprises the following steps:
the first step is as follows: inspection sampling
Sampling large wound core traction transformers produced on the same production line, wherein the total number of samples is recorded as N, and numbering the extracted large wound core traction transformers to be inspected, wherein the numbers are recorded as 1,2,3, … … and N;
the second step is that: test for inspection
The extracted large-scale wound core traction transformer (No. 1,2,3, … …, N) is subjected to inspection and test one by one, and the specific test steps are as follows:
2.1 test preparation and test connections
The method comprises the steps that a high-voltage winding wire inlet end of a wound core traction transformer is in short circuit with a high-voltage winding wire outlet end, then the wound core traction transformer is connected with a voltage output end of a frequency domain dielectric spectrum tester, a low-voltage winding wire inlet end of the wound core traction transformer is in short circuit with a low-voltage winding wire outlet end, then the wound core traction transformer is connected with a voltage input end of the frequency domain dielectric spectrum tester, and the environment temperature is tested and recorded as T (centigrade);
2.2 frequency-Domain dielectric Spectroscopy testing
Setting the output voltage to 1400 volts, setting the test frequency range to be 1 kHz-1 mHz, starting a frequency domain dielectric spectrum tester to perform frequency domain dielectric spectrum test on the wound core traction transformer to obtain a frequency domain dielectric spectrum of a relative complex dielectric constant real part (epsilon ') and a relative complex dielectric constant imaginary part (epsilon') at an ambient temperature T (centigrade);
2.3 frequency domain dielectric Spectroscopy test result reduction
The frequency domain dielectric spectrum of the real part (epsilon ') of the relative complex dielectric constant of the insulation in the traction transformer at the ambient temperature T measured in the step 2.2 is reduced to the reference temperature of 15 ℃ according to the formula (1), and the frequency domain dielectric spectrum of the imaginary part (epsilon') of the relative complex dielectric constant of the insulation in the wound core transformer at the ambient temperature T measured in the step 2.2 is reduced to the reference temperature of 15 ℃ according to the formula (2)
In the formula (f) T For the test frequencies of the frequency domain dielectric spectrum at ambient temperature T (including 1mHz,2.15mHz,4.64mHz,0.01Hz,0.02154Hz,0.04642Hz,0.1Hz,0.21544Hz,0.46416Hz,1Hz,2.1544Hz, 4.64116Hz, 10Hz,20Hz,42Hz,60Hz,90Hz, 220470Hz, 1000Hz), f 15℃ Is f T F in the formulae (1) and (2) at a frequency corresponding to a reference temperature of 15 DEG C T /f 15℃ The following expression is given:
obtaining a frequency domain dielectric spectrum curve of a real part (epsilon ') of the complex dielectric constant and an imaginary part (epsilon') of the relative complex dielectric constant at the reference temperature of 15 ℃ by performing polynomial fitting on the test result after being reduced to the reference temperature of 15 ℃;
the third step: feature parameter extraction
And (3) extracting characteristic parameters one by one according to the test result of the extracted large-scale wound core traction transformer (No. 1,2,3, … …, N): by adopting the expressions of epsilon 'and epsilon' shown in the formulas (4) and (5), based on the frequency domain dielectric spectrum of epsilon 'and epsilon' of the insulation in the wound core traction transformer at the reference temperature of 15 ℃ obtained in the second step, MATLAB is used for fitting by a nonlinear least square method, and then characteristic parameters (sigma) dc ，Δε 1 ，Δε 2 ，τ 1 ，τ 2 ) In order to ensure the uniqueness and accuracy of the model parameter fitting result during fitting, the value (6) is used as an objective function, when the error sum of squares theta is minimum, the fitting is considered to be effective, and the characteristic parameter values of the extracted large-sized wound core traction transformer (1,2,3, … …, no. N) are sequentially recorded as (sigma) dc_1 ，Δε 1_1 ，Δε 2_1 ，τ 1_1 ，τ 2_1 )，(σ dc_2 ，Δε 1_2 ，Δε 2_2 ，τ 1_2 ，τ 2_2 )，(σ dc_3 ，Δε 1_3 ，Δε 2_3 ，τ 1_3 ，τ 2_3 )，……，(σ dc_N ，Δε 1_N ，Δε 2_N ，τ 1_N ，τ 2_N )；
In the formula, σ dc Is the direct current conductivity, Δ ε 1 Relaxation intensity of interface polarization, Δ ε 2 Relaxation intensity, τ, for dipole-steered polarization 1 Relaxation time, τ, for interfacial polarization 2 Relaxation of dipole-oriented polarizationM, a 1 Distribution parameter of interfacial polarization, alpha 2 Is a distribution parameter of dipole steering polarization, omega is an angular frequency, epsilon' fit (ω) is the fitting value, ε ″) fit (ω) is a test value, and when the parameter extraction process uses MATLAB to perform parameter fitting by a nonlinear least squares method, the boundary constraint conditions are as follows: high frequency dielectric constant 0<ε ∞ < 10, DC conductance 10 -11 <σ dc <10 -4 Interfacial polarization relaxation Strength 0.1<Δε 1 < 400, interfacial polarization relaxation time 10<τ 1 &10000, dipole polarization relaxation intensity of 0.1<Δε 2 < 20 dipole turn polarization relaxation time 10 -12 <τ 2 <10 -6 Distribution parameter 0<α 1 、α 2 <1；
The fourth step: effect test of large winding insulation process for wound core traction transformer
Calculating a detection coefficient H through the formula (4), if the detection coefficient H is larger than a standard value k, the large winding insulation process of the wound core traction transformer is unqualified, and if the detection coefficient H is smaller than or equal to the standard value k, the large winding insulation process of the wound core traction transformer is qualified, and the value k is set to be 0.05;
h in the formula (7) 1 For a characteristic parameter σ dc Checking coefficient of (H) 2 Is a characteristic parameter Δ ε 1 Checking coefficient of (H) 3 Is a characteristic parameter Δ ε 2 Checking coefficient of (H) 4 For a characteristic parameter τ 1 Checking coefficient of (H) 5 For a characteristic parameter τ 2 Checking coefficient of (H) 1 To H 5 The specific calculation method is as follows:
Claims (1)
1. the method for testing the winding process effect of the large-scale wound core traction transformer is characterized by comprising the following steps of:
the first step is as follows: inspection sampling
Sampling large wound core traction transformers produced on the same production line, wherein the total number of samples is recorded as N, and numbering the extracted large wound core traction transformers to be inspected, wherein the numbers are recorded as 1,2,3, … … and N;
the second step is that: test for inspection
The extracted large-scale wound core traction transformer (No. 1,2,3, … …, N) is subjected to inspection and test one by one, and the specific test steps are as follows:
2.1 test preparation and test connections
The method comprises the steps that a high-voltage winding wire inlet end of a wound core traction transformer is in short circuit with a high-voltage winding wire outlet end, then the wound core traction transformer is connected with a voltage output end of a frequency domain dielectric spectrum tester, a low-voltage winding wire inlet end of the wound core traction transformer is in short circuit with a low-voltage winding wire outlet end, then the wound core traction transformer is connected with a voltage input end of the frequency domain dielectric spectrum tester, and the environment temperature is tested and recorded as T (centigrade);
2.2 frequency-Domain dielectric Spectroscopy testing
Setting the output voltage to 1400 volts, setting the test frequency range to be 1 kHz-1 mHz, starting a frequency domain dielectric spectrum tester to perform frequency domain dielectric spectrum test on the wound core traction transformer to obtain a frequency domain dielectric spectrum of a relative complex dielectric constant real part (epsilon ') and a relative complex dielectric constant imaginary part (epsilon') at an ambient temperature T (centigrade);
2.3 frequency domain dielectric Spectroscopy test result reduction
The frequency domain dielectric spectrum of the real part (epsilon ') of the relative complex dielectric constant of the insulation in the traction transformer at the ambient temperature T measured in the step 2.2 is reduced to the reference temperature of 15 ℃ according to the formula (1), and the frequency domain dielectric spectrum of the imaginary part (epsilon') of the relative complex dielectric constant of the insulation in the wound core transformer at the ambient temperature T measured in the step 2.2 is reduced to the reference temperature of 15 ℃ according to the formula (2)
In the formula (f) T Is the test frequency of the frequency domain dielectric spectrum at the ambient temperature T, and the test frequency is: including 1mHz,2.15mHz,4.64mHz,0.01Hz,0.02154Hz,0.04642Hz,0.1Hz,0.21544Hz,0.46416Hz,1Hz,2.1544Hz,4.6416Hz,10Hz,20Hz,42Hz,60Hz,90Hz,220Hz,470Hz,1000Hz; f. of 15℃ Is f T F in the formulae (1) and (2) at a frequency corresponding to a reference temperature of 15 DEG C T /f 15℃ The following expression is given:
obtaining a frequency domain dielectric spectrum curve of a real part (epsilon ') of the complex dielectric constant and an imaginary part (epsilon') of the relative complex dielectric constant at the reference temperature of 15 ℃ by performing polynomial fitting on the test result after being reduced to the reference temperature of 15 ℃;
the third step: feature parameter extraction
And (3) extracting characteristic parameters one by one according to the test result of the extracted large-scale wound core traction transformer (No. 1,2,3, … …, N): by adopting the expressions of epsilon 'and epsilon' shown in the formulas (4) and (5), based on the frequency domain dielectric spectrum of epsilon 'and epsilon' of the insulation in the wound core traction transformer at the reference temperature of 15 ℃ obtained in the second step, MATLAB is used for fitting by a nonlinear least square method, and then characteristic parameters (sigma) dc ，Δε 1 ，Δε 2 ，τ 1 ，τ 2 ) In order to ensure the uniqueness and accuracy of the model parameter fitting result during fitting, the value (6) is used as an objective function, when the error sum of squares theta is minimum, the fitting is considered to be effective, and the characteristic parameter values of the extracted large-sized wound core traction transformer (1,2,3, … …, no. N) are sequentially recorded as (sigma) dc_1 ，Δε 1_1 ，Δε 2_1 ，τ 1_1 ，τ 2_1 )，(σ dc_2 ，Δε 1_2 ，Δε 2_2 ，τ 1_2 ，τ 2_2 )，(σ dc_3 ，Δε 1_3 ，Δε 2_3 ，τ 1_3 ，τ 2_3 )，……，(σ dc_N ，Δε 1_N ，Δε 2_N ，τ 1_N ，τ 2_N )；
In the formula, σ dc Is direct current conductivity, Δ ε 1 Relaxation intensity of interface polarization, Δ ε 2 Relaxation intensity, τ, for dipole-steered polarization 1 Relaxation time, τ, for interfacial polarization 2 Relaxation time for dipole-steered polarization，α 1 Distribution parameter of interfacial polarization, alpha 2 Is a distribution parameter of dipole steering polarization, omega is an angular frequency, epsilon' fit (ω) is the fitting value, ε ″) fit (ω) is a test value, and when the parameter extraction process uses MATLAB to perform parameter fitting by a nonlinear least squares method, the boundary constraint conditions are as follows: high frequency dielectric constant 0<ε ∞ < 10, DC conductance 10 -11 <σ dc <10 -4 Interfacial polarization relaxation Strength 0.1<Δε 1 < 400, interfacial polarization relaxation time 10<τ 1 &10000, dipole polarization relaxation intensity of 0.1<Δε 2 < 20 dipole turn polarization relaxation time 10 -12 <τ 2 <10 -6 Distribution parameter 0<α 1 、α 2 <1；
The fourth step: effect test of large winding insulation process for wound core traction transformer
Calculating an inspection coefficient H through a formula (7), if the inspection coefficient H is larger than a standard value k, the large winding insulation process of the wound core traction transformer is unqualified, and if the inspection coefficient H is smaller than or equal to the standard value k, the large winding insulation process of the wound core traction transformer is qualified, and the value k is set according to production requirements;
h in the formula (7) 1 For a characteristic parameter σ dc Checking coefficient of (H) 2 Is a characteristic parameter Δ ε 1 Checking coefficient of (H) 3 Is a characteristic parameter Δ ε 2 Checking coefficient of (H) 4 For a characteristic parameter τ 1 Checking coefficient of (H) 5 For a characteristic parameter τ 2 Checking coefficient of (H) 1 To H 5 The specific calculation method is as follows:
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