CN107329065B - A method of tractive transformer casing state of insulation in assessment military service - Google Patents
A method of tractive transformer casing state of insulation in assessment military service Download PDFInfo
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- CN107329065B CN107329065B CN201710737436.2A CN201710737436A CN107329065B CN 107329065 B CN107329065 B CN 107329065B CN 201710737436 A CN201710737436 A CN 201710737436A CN 107329065 B CN107329065 B CN 107329065B
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- tractive transformer
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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
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Abstract
The invention discloses a kind of methods of tractive transformer casing state of insulation in assessment military service, are assessed tractive transformer state of insulation in military service, are mainly included the following steps：1) moisture content in insulating oil when test tractive transformer casing dispatches from the factory；2) insulating materials experiment is carried out；3) dielectric features parameter when the factory of test tractive transformer casing；4) tractive transformer casing dielectric features parameter when being calculated critical；5) tractive transformer casing dielectric features parameter in test military service；6) tractive transformer casing state of insulation in assessment military service.The sinusoidal voltage that the method for the present invention applies different frequency to casing under the conditions of lossless measures its dielectric constant, have many advantages, such as to apply that voltage is low, informative, the dielectric spectroscopy of casing at this stage can only be tested by overcoming the prior art, cannot with casing dispatch from the factory when relevant information combine, can not Comprehensive assessment casing state of insulation the shortcomings that.
Description
Technical field
The invention belongs to bushing shell for transformer state of insulation detection fields, and in particular to a kind of assessment be on active service in tractive transformer
The method of casing state of insulation.
Background technique
Tractive transformer casing plays a part of support and connection insulation as the external connection device of transformer, to realize
With the connection of external electrical network, casing in the process of running, is immersed by outside moisture and itself is electric, hot and mechanical stress more
Recast is used, and aging can occur for insulation, causes tractive transformer to break down, and then influence whether the transmission of electric energy, therefore right
The assessment of tractive transformer state of insulation is particularly significant in military service.Frequency domain dielectric response method is a kind of lossless and can effectively assess set
The test method of pipe degree of aging and state of making moist, principle are that the sinusoidal voltage for applying different frequency to casing measures it
Dielectric constant analyzes required information according to the feature of its dielectric constant, has application low, informative of voltage etc. excellent
Point.However currently, based on frequency domain dielectric response method to tractive transformer casing in military service carry out assessment diagnosis when, can only test suite
Pipe dielectric spectroscopy at this stage information cannot be combined when casing dispatches from the factory, can not Comprehensive assessment casing insulation
State, therefore it is badly in need of a kind of method for assessing tractive transformer casing state of insulation in military service.
Summary of the invention
Traction become casing Window time in its with respect to complex dielectric permittivity real part effectively tested when, in order to avoid because
Influence of the time varying temperature caused by Window time is short to test result, the present invention provides tractive transformers in a kind of assessment military service
The method of casing state of insulation.
A method of tractive transformer casing state of insulation in assessment military service, this approach includes the following steps：
The first step：Moisture content in insulating oil when testing the factory of tractive transformer casing
Moisture content in insulating oil, is denoted as C when test test tractive transformer casing factory0；
Second step：Carry out insulating materials experiment
2.1 insulating paper is immersed in insulating oil, test is C when insulating oil moisture content0When insulation in each Frequency point
The opposite complex dielectric permittivity imaginary part of (1mHz, 2mHz, 4mHz and 0.01Hz), and then extract and obtain dielectric features parameter X0；
2.2 immerse insulating paper in insulating oil, and test is C when insulating oil moisture contentmaxWhen insulation in above-mentioned each Frequency point
Opposite complex dielectric permittivity imaginary part, and then extract obtain dielectric features parameter Xmax；
2.3 calculate dielectric features parameter coefficient k by formula (1)
Third step：Dielectric features parameter when testing the factory of tractive transformer casing
(insulating oil moisture content is C when test test tractive transformer casing factory0When) insulate in above-mentioned each Frequency point
The opposite complex dielectric permittivity imaginary part of (1mHz, 2mHz, 4mHz, 0.01Hz), so extract tractive transformer casing factory when
Dielectric features parameter Y0；
4th step：Moisture content C in insulating oil is calculatedmaxWhen tractive transformer casing dielectric features parameter
Moisture content C in insulating oil is calculated by formula (2)maxWhen tractive transformer casing dielectric features parameter Ymax
Ymax=kY0 (2)
5th step：Tractive transformer casing dielectric features parameter in test military service
To in military service tractive transformer set pipe insulation carry out the test of frequency domain dielectric response, be on active service in tractive transformer set
Pipe insulation and then extracts clothes in the opposite complex dielectric permittivity imaginary part of above-mentioned each Frequency point (1mHz, 2mHz, 4mHz, 0.01Hz)
The dielectric features parameter Y of tractive transformer casing in labour
6th step：Tractive transformer casing state of insulation in assessment military service
Setting assessment vigilance parameter a, tractive transformer casing state of insulation coefficient H in being on active service is calculated according to formula (3)
The extraction dielectric features parameter extracting method is：Note 0.01Hz Frequency point test result is denoted as ε1", 4mHz frequency
Rate point test result is denoted as ε2", 2mHz Frequency point test result is denoted as ε3", 1mHz Frequency point test result is denoted as ε4", then will
The opposite complex dielectric permittivity imaginary results that each Frequency point is tested are converted into logarithmic coordinates system, are then based on shown in formula (4)
Straight line expression formula be fitted test result, and then obtain the slope s and intercept b of straight line expression formula shown in formula (4)；
Y is log ε " in y=sx+b (4) formula (4), and x is log ω, and ω is to survey the angular frequency value of each examination Frequency point and wait
In 2 π f, then dielectric features parameter can be calculated by formula (5)
Detailed description of the invention
The method flow diagram of tractive transformer casing state of insulation in a kind of assessment military service of Fig. 1.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings：
Fig. 1 show a kind of assessment be on active service in tractive transformer casing state of insulation method flow diagram, as shown in Figure 1 one
The method of tractive transformer casing state of insulation, comprises the steps of in kind assessment military service：
The first step：Moisture content in insulating oil when testing the factory of tractive transformer casing
Moisture content in insulating oil, is denoted as C when test test tractive transformer casing factory0；
Second step：Carry out insulating materials experiment
2.1 immerse insulating paper in insulating oil, and test is C when insulating oil moisture content0When insulation Frequency point (1mHz,
2mHz, 4mHz, 0.01Hz) opposite complex dielectric permittivity imaginary part, and then extract obtain dielectric features parameter X0；
2.2 immerse insulating paper in insulating oil, and test is C when insulating oil moisture contentmaxWhen insulation in above-mentioned each Frequency point
Opposite complex dielectric permittivity imaginary part, and then extract obtain dielectric features parameter Xmax；
2.3 calculate dielectric features parameter coefficient k by formula (1)
Third step：Dielectric features parameter when testing the factory of tractive transformer casing
(insulating oil moisture content is C when test test tractive transformer casing factory0When) insulate in above-mentioned each Frequency point
The opposite complex dielectric permittivity imaginary part of (1mHz, 2mHz, 4mHz, 0.01Hz), so extract tractive transformer casing factory when
Dielectric features parameter Y0；
4th step：Moisture content C in insulating oil is calculatedmaxWhen tractive transformer casing dielectric features parameter
Moisture content C in insulating oil is calculated by formula (2)maxWhen tractive transformer casing dielectric features parameter Ymax
Ymax=kY0 (2)
5th step：Tractive transformer casing dielectric features parameter in test military service
To in military service tractive transformer set pipe insulation carry out the test of frequency domain dielectric response, be on active service in tractive transformer set
Pipe insulation and then extracts clothes in the opposite complex dielectric permittivity imaginary part of above-mentioned each Frequency point (1mHz, 2mHz, 4mHz, 0.01Hz)
The dielectric features parameter Y of tractive transformer casing in labour
6th step：Tractive transformer casing state of insulation in assessment military service
Set assessment vigilance parameter a be 0.8, according to formula (3) calculate military service in tractive transformer casing state of insulation coefficient H
The extraction dielectric features parameter extracting method is：Note 0.01Hz Frequency point test result is denoted as ε1", 4mHz frequency
Rate point test result is denoted as ε2", 2mHz Frequency point test result is denoted as ε3", 1mHz Frequency point test result is denoted as ε4", then will
The opposite complex dielectric permittivity imaginary results that each Frequency point is tested are converted into logarithmic coordinates system, are then based on shown in formula (4)
Straight line expression formula be fitted test result, and then obtain the slope s and intercept b of straight line expression formula shown in formula (4)；
Y=sx+b (4)
Y is log ε " in formula (4), and x is log ω, and ω is to survey the angular frequency value of each examination Frequency point and be equal to 2 π f, then spy of insulating
Sign parameter can be calculated by formula (5)
Claims (1)
1. a kind of method of tractive transformer casing state of insulation in assessment military service, which is characterized in that include the following steps：
The first step：Moisture content in insulating oil when testing the factory of tractive transformer casing
Moisture content in insulating oil, is denoted as C when testing the factory of tractive transformer casing0；
Second step：Carry out insulating materials experiment
2.1 immerse insulating paper in insulating oil, and test is C when insulating oil moisture content0When insulating paper in Frequency point 1mHz, 2mHz,
The opposite complex dielectric permittivity imaginary part of 4mHz and 0.01Hz, and then extract and obtain dielectric features parameter X0；
2.2 immerse insulating paper in insulating oil, and test is C when insulating oil moisture contentmaxWhen insulating paper in above-mentioned each Frequency point
Opposite complex dielectric permittivity imaginary part, and then extract and obtain dielectric features parameter Xmax；
2.3 calculate dielectric features parameter coefficient k by formula (1)
Third step：Dielectric features parameter when testing the factory of tractive transformer casing
When testing the factory of tractive transformer casing, i.e., insulating oil moisture content is C0When, tractive transformer casing is in each Frequency point
Opposite complex dielectric permittivity imaginary part, so extract the factory of tractive transformer casing when dielectric features parameter Y0；
4th step：Tractive transformer casing dielectric features parameter when moisture content critical value in insulating oil is calculated
Moisture content C in insulating oil is calculated by formula (2)maxWhen tractive transformer casing dielectric features parameter Ymax
Ymax=kY0 (2)
5th step：Tractive transformer casing dielectric features parameter in test military service
To in military service tractive transformer set pipe insulation carry out the test of frequency domain dielectric response, be on active service in tractive transformer casing it is exhausted
Edge each Frequency point opposite complex dielectric permittivity imaginary part, and then extract be on active service in tractive transformer casing dielectric features parameter
Y
6th step：Tractive transformer casing state of insulation in assessment military service
Setting assessment vigilance parameter a, tractive transformer casing state of insulation coefficient H in being on active service is calculated according to formula (3)
In the second step, third step and the 5th step, the method for extracting dielectric features parameter is：Remember 0.01Hz Frequency point test knot
Fruit is denoted as ε1", 4mHz Frequency point test result is denoted as ε2", 2mHz Frequency point test result is denoted as ε3", 1mHz Frequency point test knot
Fruit is denoted as ε4", the opposite complex dielectric permittivity imaginary results for then testing each Frequency point are converted into logarithmic coordinates system, so
Test result is fitted based on straight line expression formula shown in formula (4) afterwards, and then obtains the slope s of straight line expression formula shown in formula (4)
With intercept b；
Y=sx+b (4)
Y is log ε " in formula (4), and x is log ω, and ω is to test the angular frequency value of each Frequency point and be equal to 2 π f, then dielectric features are joined
Number can be calculated by formula (5)
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| CN108535612B (en) * | 2018-04-10 | 2020-09-04 | 国网重庆市电力公司电力科学研究院 | SF6 insulating sleeve insulation detection database construction method and detection method and device thereof |
| CN111308286B (en) * | 2020-03-06 | 2021-01-12 | 西南交通大学 | Method for estimating service life of traction transformer under multi-parameter empowerment combination |
| CN114354698B (en) * | 2021-12-03 | 2022-07-26 | 西南交通大学 | Assessment method suitable for transformer bushing water content in high and cold environment |
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| JP2000002743A (en) * | 1998-06-15 | 2000-01-07 | Tokyo Electric Power Co Inc:The | Insulation deterioration diagnostic method for high- voltage equipment such as high-voltage overhead cable branch connecting body for power distribution |
| DE102005025449B4 (en) * | 2005-06-02 | 2007-05-03 | Omicron Electronics Gmbh | Method and device for measuring a dielectric response of an electrical insulation system |
| CN102062746A (en) * | 2010-11-09 | 2011-05-18 | 西南交通大学 | Method for measuring oiled paper insulated micro water content on basis of dielectric response |
| CN102818974B (en) * | 2012-07-13 | 2015-07-29 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of method assessing transformer major insulation degree of aging |
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