CN113237920A - Method for detecting fault heat source of valve-side sleeve of extra-high voltage converter transformer - Google Patents
Method for detecting fault heat source of valve-side sleeve of extra-high voltage converter transformer Download PDFInfo
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- CN113237920A CN113237920A CN202110534954.0A CN202110534954A CN113237920A CN 113237920 A CN113237920 A CN 113237920A CN 202110534954 A CN202110534954 A CN 202110534954A CN 113237920 A CN113237920 A CN 113237920A
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Abstract
The invention discloses a method for detecting a fault heat source of a valve side sleeve of an extra-high voltage converter transformer, which describes the defects inside the valve side sleeve of the extra-high voltage converter transformer by using two physical geometric concepts of surface defects and body defects, and summarizes and approximates the defects generated by the working conditions of metal particles, bubbles, casting link cracks and capacitive screen breakdown of the valve side sleeve of the extra-high voltage converter transformer from the aspects of thermal property and geometric property; the valve side sleeve with different size surface defects and body defects is used as a sample, the surface heat flux obtained by the actual measurement of a heat flow sensor is used for calculating the defect fault heat source intensity through a valve side sleeve internal defect heat source equivalent model, and the detailed corresponding curve data of the defect fault and heating conditions, namely the heat source intensity, is formed through a fitted numerical analysis means, so that data support is provided for effectively preventing sleeve faults, and accurate fault heat source detection is realized.
Description
Technical Field
The invention relates to the field of extra-high voltage fault detection, in particular to a method for detecting a fault heat source of a valve-side sleeve of an extra-high voltage converter transformer.
Background
The valve side sleeve of the converter transformer is a core component of the converter transformer, has the function of leading out a lead of an internal winding of the transformer to the outside of an oil tank so as to realize connection with an external power grid, plays a role in lead-to-ground insulation and lead fixation, and is an important bridge for connecting the converter transformer and a valve hall of a converter station.
With the continuous increase of the electric load, a complex operation environment with long distance, high voltage and large capacity puts higher requirements on the stable operation of the bushing. In the report of 2003 + 2014 operation condition analysis, for twelve years in 2003 + 2014, 29 converter stations of the national grid company have outlet direct current blocking in the direct current single/bipolar operation process caused by 36 direct current primary equipment faults, wherein the blocking frequency caused by the direct current sleeve is 6 times and accounts for 16.7% of the direct current primary equipment faults. According to investigation, due to design defects or poor contact inside the sleeve on the converter transformer valve side, the current-carrying guide pipe carries large harmonic current components except the fundamental current, the temperature in the core is higher than that of the conventional transformer sleeve, and the defects inside the core easily cause overheating and cause faults. Therefore, the accurate detection of the internal defects of the valve side sleeve of the extra-high voltage converter transformer is the key for effectively preventing the sleeve from faults.
Disclosure of Invention
Aiming at the defects in the prior art, the method for detecting the fault heat source of the valve side sleeve of the extra-high voltage converter transformer solves the problem of how to accurately detect the fault heat source of the defects in the valve side sleeve of the extra-high voltage converter transformer.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a method for detecting a fault heat source of a valve side sleeve of an extra-high voltage converter transformer comprises the following steps:
s1, marking N extra-high voltage converter transformer valve side sleeves with surface defects of different geometric dimensions and M defects of different geometric dimensions as N + M samples, and fixing the samples in a test platform, wherein N and M are positive integers;
s2, fixing the heat flow sensor on the surfaces of the N + M samples in the test platform, and acquiring the surface heat fluxes of the N + M samples;
s3, calculating the heat source intensity of the N surface defect samples and the heat source intensity of the M individual defect samples by using engineering finite element numerical calculation software through a valve side sleeve internal defect heat source equivalent model according to the surface heat flux and the equivalent spherical domain space of the N + M samples;
s4, obtaining an S-Q surface defect-heat source intensity curve according to the heat source intensity of the N surface defect samples, and obtaining a V-Q body defect-heat source intensity curve according to the heat source intensity of the M individual defect samples;
and S5, measuring the surface defect and the body defect of the valve side sleeve of the extra-high voltage converter transformer in use in the engineering, obtaining the heat source strength of the extra-high voltage converter transformer according to the S-Q surface defect-heat source strength curve and the V-Q body defect-heat source strength curve, and realizing the detection of a fault heat source.
Further, the heat flow sensor in the step S2 is an array type high precision heat flow sensor.
Further, the array type high precision heat flow sensor is model XM269C, and the total array size is 4.4mm × 4.4mm × 0.5 mm.
The beneficial effects of the above further scheme are: the extra-high voltage converter transformer valve side sleeve has a typical size, an array type high-precision heat flow sensor is adopted, and the unique size is matched with the valve side sleeve, so that the measurement result is more accurate than that of a heat flow sensor with a single sensing element.
Further, the valve-side sleeve internal defect heat source equivalent model in the step S3 belongs to a space sphere model.
Further, the model expression of the valve side sleeve internal defect heat source equivalent model in step S3 is:
Q＝∫∫∫ΩqdV (1)
q is the heat source intensity of the valve side sleeve of the extra-high voltage converter transformer, Q is the surface heat flux of the valve side sleeve of the extra-high voltage converter transformer, dV is the integral variable element of volume fraction, and omega is the equivalent spherical domain space of the valve side sleeve of the extra-high voltage converter transformer.
The beneficial effects of the above further scheme are: the valve side sleeve internal defect heat source equivalent model accurately describes heating and heat diffusion of an internal defect of an extra-high voltage converter transformer valve side sleeve according to the theory that a heat diffusion form in a heat conduction theory is spherical, and establishes a bridge for calculating heat source intensity by surface heat flux, wherein a heat source is a defect fault position, so that a fault heat source can be effectively detected; the fault part of the valve side sleeve of the extra-high voltage converter transformer is similar to a sphere, and the calculation complexity is greatly reduced.
Further, the step S4 includes the following sub-steps:
s41, taking the heat source intensity of N surface defect samples in the N + M samples as a vertical coordinate, and taking the geometric dimension of the surface defects as a horizontal coordinate to obtain N S-Q coordinate points;
s42, fitting the N S-Q coordinate points into an S-Q surface defect-heat source intensity curve;
s43, taking the heat source intensity of M individual defect samples in the N + M samples as a vertical coordinate, and taking the geometric dimension of the individual defects as a horizontal coordinate to obtain M V-Q coordinate points;
and S44, fitting the M V-Q coordinate points into a V-Q body defect-heat source intensity curve.
The invention has the beneficial effects that: describing the defects inside the ultrahigh voltage converter transformer valve side sleeve by two physical geometric concepts of surface defects and body defects, summarizing and approximating the defects generated by the ultrahigh voltage converter transformer valve side sleeve due to the working conditions of metal particles, bubbles, casting crack and capacitive screen breakdown, from the thermal and geometric properties; the valve side sleeve with different size surface defects and body defects is used as a sample, the surface heat flux obtained by the actual measurement of a heat flow sensor is used for calculating the defect fault heat source intensity through a valve side sleeve internal defect heat source equivalent model, and the detailed corresponding curve data of the defect fault and heating conditions, namely the heat source intensity, is formed through a fitted numerical analysis means, so that data support is provided for effectively preventing sleeve faults, and accurate fault heat source detection is realized.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting a fault heat source of a valve-side sleeve of an extra-high voltage converter transformer.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, in an embodiment of the present invention, a method for detecting a fault heat source of a valve-side bushing of an extra-high voltage converter transformer includes the following steps:
s1, marking N extra-high voltage converter transformer valve side sleeves with surface defects and M body defects with different geometric dimensions as N + M samples, and fixing the samples in a test platform, wherein N and M are positive integers.
S2, fixing the heat flow sensor on the surfaces of the N + M samples in the test platform, and acquiring the surface heat flux of the N + M samples.
The heat flow sensor is an array type high-precision heat flow sensor. A specific model is XM269C with total array dimensions of 4.4mm by 0.5 mm.
The extra-high voltage converter transformer valve side sleeve has a typical size, an array type high-precision heat flow sensor is adopted, and the unique size is matched with the valve side sleeve, so that the measurement result is more accurate than that of a heat flow sensor with a single sensing element.
And S3, calculating to obtain the heat source intensity of each of the N + M samples by using engineering finite element numerical calculation software through a valve side sleeve internal defect heat source equivalent model according to the surface heat flux and the equivalent spherical domain space of each of the N + M samples.
The valve side sleeve pipe internal defect heat source equivalent model belongs to a space sphere model, and the model expression is as follows:
Q＝∫∫∫ΩqdV (1)
q is the heat source intensity of the valve side sleeve of the extra-high voltage converter transformer, Q is the surface heat flux of the valve side sleeve of the extra-high voltage converter transformer, dV is the integral variable element of volume fraction, and omega is the equivalent spherical domain space of the valve side sleeve of the extra-high voltage converter transformer.
The valve side sleeve internal defect heat source equivalent model accurately describes heating and heat diffusion of an internal defect of an extra-high voltage converter transformer valve side sleeve according to the theory that a heat diffusion form in a heat conduction theory is spherical, and establishes a bridge for calculating heat source intensity by surface heat flux, wherein a heat source is a defect fault position, so that a fault heat source can be effectively detected; the fault part of the valve side sleeve of the extra-high voltage converter transformer is similar to a sphere, and the calculation complexity is greatly reduced.
And S4, obtaining an S-Q surface defect-heat source intensity curve according to the heat source intensity of the N surface defect samples, and obtaining a V-Q body defect-heat source intensity curve according to the heat source intensity of the M individual defect samples.
Step S4 includes the following substeps:
s41, taking the heat source strength of N extra-high voltage converter transformer valve side sleeves with different surface defects in the N + M samples as a vertical coordinate, and taking the geometric size of the surface defects as a horizontal coordinate to obtain N S-Q coordinate points;
s42, fitting the N S-Q coordinate points into an S-Q surface defect-heat source intensity curve;
s43, taking the heat source strength of M extra-high voltage converter transformer valve side sleeves with different physical defects in the N + M samples as a vertical coordinate, and taking the physical defects as an abscissa to obtain M V-Q coordinate points;
and S44, fitting the M V-Q coordinate points into a V-Q body defect-heat source intensity curve.
And S5, measuring the surface defect and the body defect of the valve side sleeve of the extra-high voltage converter transformer in use in the engineering, obtaining the heat source strength of the extra-high voltage converter transformer according to the S-Q surface defect-heat source strength curve and the V-Q body defect-heat source strength curve, and realizing the detection of a fault heat source.
The invention describes the defects inside the extra-high voltage converter transformer valve side sleeve by using two physical geometric concepts of surface defects and body defects, summarizes and approximates the defects generated by the extra-high voltage converter transformer valve side sleeve due to the working conditions of metal particles, bubbles, casting link cracks and capacitor screen breakdown, from the thermal property and the geometric property; the valve side sleeve with different size surface defects and body defects is used as a sample, the surface heat flux obtained by the actual measurement of a heat flow sensor is used for calculating the defect fault heat source intensity through a valve side sleeve internal defect heat source equivalent model, and the detailed corresponding curve data of the defect fault and heating conditions, namely the heat source intensity, is formed through a fitted numerical analysis means, so that data support is provided for effectively preventing sleeve faults, and accurate fault heat source detection is realized.
Claims (6)
1. A method for detecting a fault heat source of a valve side sleeve of an extra-high voltage converter transformer is characterized by comprising the following steps:
s1, marking N extra-high voltage converter transformer valve side sleeves with surface defects of different geometric dimensions and M defects of different geometric dimensions as N + M samples, and fixing the samples in a test platform, wherein N and M are positive integers;
s2, fixing the heat flow sensor on the surfaces of the N + M samples in the test platform, and acquiring the surface heat fluxes of the N + M samples;
s3, calculating the heat source intensity of the N surface defect samples and the heat source intensity of the M individual defect samples by using engineering finite element numerical calculation software through a valve side sleeve internal defect heat source equivalent model according to the surface heat flux and the equivalent spherical domain space of the N + M samples;
s4, obtaining an S-Q surface defect-heat source intensity curve according to the heat source intensity of the N surface defect samples, and obtaining a V-Q body defect-heat source intensity curve according to the heat source intensity of the M individual defect samples;
and S5, measuring the surface defect and the body defect of the valve side sleeve of the extra-high voltage converter transformer in use in the engineering, obtaining the heat source strength of the extra-high voltage converter transformer according to the S-Q surface defect-heat source strength curve and the V-Q body defect-heat source strength curve, and realizing the detection of a fault heat source.
2. The method for detecting the fault heat source of the valve-side sleeve of the extra-high voltage converter transformer according to claim 1, wherein the heat flow sensor in the step S2 is an array type high-precision heat flow sensor.
3. The method for detecting the fault heat source of the valve-side sleeve of the extra-high voltage converter transformer according to claim 2, wherein the model of the array type high-precision heat flow sensor is XM269C, and the total size of the array is 4.4mm x 0.5 mm.
4. The method for detecting the fault heat source of the valve-side sleeve of the extra-high voltage converter transformer according to claim 1, wherein the equivalent model of the heat source of the defect inside the valve-side sleeve in the step S3 belongs to a spatial sphere model.
5. The method for detecting the fault heat source of the valve-side sleeve of the extra-high voltage converter transformer according to claim 4, wherein the model expression of the equivalent model of the fault heat source inside the valve-side sleeve in the step S3 is as follows:
Q＝∫∫∫ΩqdV (1)
q is the heat source intensity of the valve side sleeve of the extra-high voltage converter transformer, Q is the surface heat flux of the valve side sleeve of the extra-high voltage converter transformer, dV is the integral variable element of volume fraction, and omega is the equivalent spherical domain space of the valve side sleeve of the extra-high voltage converter transformer.
6. The method for detecting the fault heat source of the valve-side sleeve of the extra-high voltage converter transformer according to claim 1, wherein the step S4 comprises the following substeps:
s41, taking the heat source intensity of N surface defect samples in the N + M samples as a vertical coordinate, and taking the geometric dimension of the surface defects as a horizontal coordinate to obtain N S-Q coordinate points;
s42, fitting the N S-Q coordinate points into an S-Q surface defect-heat source intensity curve;
s43, taking the heat source intensity of M individual defect samples in the N + M samples as a vertical coordinate, and taking the geometric dimension of the individual defects as a horizontal coordinate to obtain M V-Q coordinate points;
and S44, fitting the M V-Q coordinate points into a V-Q body defect-heat source intensity curve.
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| CN114325274A (en) * | 2022-01-10 | 2022-04-12 | 西南交通大学 | Converter transformer valve side sleeve partial discharge detection system and method |
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