CN104374312A - Method for detecting deformation of power transformer windings - Google Patents
Method for detecting deformation of power transformer windings Download PDFInfo
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- CN104374312A CN104374312A CN201410627475.3A CN201410627475A CN104374312A CN 104374312 A CN104374312 A CN 104374312A CN 201410627475 A CN201410627475 A CN 201410627475A CN 104374312 A CN104374312 A CN 104374312A
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Abstract
The invention discloses a method for detecting deformation of power transformer windings. The method includes the following steps that the short-circuit impedance relative change rate, the overall correlation coefficients of amplitude-frequency curves, the amplitude-frequency curves of a low frequency band, a medium frequency band and a high frequency band, the local correlation coefficients of the amplitude-frequency curves of all the frequency bands, the voltage ratio deviation and the capacitance relative change rate are acquired; the deformed windings and phase results are acquired according to the short-circuit impedance relative change rate and the overall correlation coefficients of the amplitude-frequency curves; according to the correlation coefficient of the amplitude-frequency curve of the low frequency band and the voltage ratio deviation, turn-to-turn or cake-to-cake short circuit detection results are acquired; according to the correlation coefficient of the amplitude-frequency curve of the medium frequency band and the capacitive relative change rates between the windings, local deformation results are acquired; according to the correlation coefficient of the amplitude-frequency curve of the high frequency band and the ground capacitance relative change rates of the windings, whole displacement or lead displacement deformation detection results of winding coils are acquired; the results are logically processed, and a comprehensive detection result is acquired. According to the method, reliability of the deformation detection result of the power transformer windings is greatly improved.
Description
Technical field
The invention belongs to transformer technology field, more specifically, relate to the analytical approach of winding deformation of power transformer.
Background technology
Along with electric system installed capacity is growing, intrasystem capacity of short circuit and short-circuit current also increase thereupon, and all kinds of short circuit accidents closely exported occur the power transformer run in system unavoidably.When power transformer suffers short-circuit impact, the damage that the very strong driving force that winding internal short-circuit electric current produces will make winding insulation and mechanical property be subject in various degree, can damage transformer time serious.Transformer closely terminal short-circuit can cause winding deformation, insulation damages, winding.Short circuit accident generally can cause transformer breaking, out of service, causes larger loss to electrical network.In recent years, the generation of transformer near region or outlet short circuit, has had a strong impact on the safe and stable operation of electric system.
At present, the method for the detection winding deformation of domestic and international comparative maturity has Frequency Response Analysis method, short circuit impedance method, winding capacitance method etc.Frequency Response Analysis method is transformer operation at home and abroad and production division's widespread use at present, and obtains effect.Frequency response method judges that winding deformation is highly sensitive, can reflect that overall inductance affects little distortion.But its test result is often subject to the impact of various disturbing factor, higher to the requirement of environmental factor when using at the scene.The method not yet forms clear and definite criterion at present, easily causes erroneous judgement, needs coordinate conventional electrical experiment or hang cover inspection.
The feature of single winding capacitance method is easy to operate, but the sensitivity of winding capacitance method is not high, and effectively can not reflect winding local slight deformation, only have when winding generation gross distortion, could judge comparatively accurately, single employing winding capacitance method, False Rate is higher, sometimes can reach more than 60%, test result can only provide advisory opinion.
The feature of single short circuit impedance method is that experimental result mainly reflects short-circuit conditions between the connection of winding and turn-to-turn cake, but can not directly determine winding deformation situation, need to coordinate the deformation could determining winding more accurately with additive method, therefore, single use short circuit impedance method carries out the judgement of winding deformation, accuracy is lower, and less use in test, has significant limitation at the scene.
Voltage ratio test is as a kind of new deformation of transformer winding test householder method, and Some Domestic area is brought into use, its method simple and fast, but sensitivity is very low.Single employing voltage ratio test judges that the degree of accuracy of winding deformation is very poor, judges that success ratio only has about 30% ~ 45%.Therefore, single employing voltage ratio method of testing judges that winding deformation does not obtain spread.
At present, adopt single test method as the basis for estimation of winding deformation domestic, process of the test affects comparatively large by subjective and objective factor, sensitivity is lower, and False Rate is higher, effectively can not reflect the concrete condition of winding generation deformation more.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of detection method of winding deformation of power transformer, solve the problem that existing detection method accuracy is lower, improve the accuracy of deformation of transformer winding analyzing and diagnosing.
For achieving the above object, the invention provides a kind of detection method of winding deformation of power transformer, on the basis of existing technology, the electrical inspection methods such as comprehensive short circuit impedance method, frequency response method, voltage ratio method of testing, winding capacitance method, winding deformation be divided into deformation position and Deformation Types two large divisions to analyze, specifically comprise the following steps:
Step 1: adopt low-voltage short circuit impedance method to obtain the short-circuit impedance of winding, obtain short-circuit impedance relative change rate according to short-circuit impedance; Frequency response method is adopted to obtain the overall related coefficient of winding amplitude-frequency response; Adopt frequency response method to obtain the amplitude-frequency response Wave crest and wave trough change of the basic, normal, high frequency band of winding, obtain the partial auto-correlation of basic, normal, high frequency range amplitude-frequency response according to the change of amplitude-frequency response Wave crest and wave trough; Adopt voltage ratio method of testing to obtain winding transformation ratio, obtain voltage ratio deviation; Adopt winding capacitance method, obtain between winding respectively, winding capacitance over the ground, contrast initial value, obtains relative change rate respectively;
Step 2: according to the overall related coefficient of short-circuit impedance relative change rate and amplitude-frequency response, obtains winding deformation degree detecting result;
Step 3: according to related coefficient and the voltage ratio deviation of low-frequency range amplitude frequency curve, obtains short-circuit detecting result between turn-to-turn or cake;
Step 4: according to related coefficient and the interwinding capacity relative change rate of Mid Frequency amplitude frequency curve, obtains winding distortion or bulge local deformation testing result;
Step 5: according to related coefficient and the winding-to-earth capacity relative change rate of high band amplitude frequency curve, obtains winding coil global displacement or lead-in wire displacement detecting result;
Step 6: short-circuit detecting result, local deformation testing result and winding coil global displacement between described winding deformation degree detecting result, turn-to-turn or cake or lead-in wire Displacement-deformation testing result are carried out logical OR operation, obtain deformation of transformer winding comprehensive detection result, instruction deformation happening part, the type of deformation, the degree of deformation.
Wherein, low-voltage short circuit impedance method refers to: carry out the test of low-voltage short-circuit impedance to power transformer, test result and name plate rating or factory-said value are compared, to judge catastrophic failure short-circuit current or because of transport with install the determination method that the winding caused has non-displacement.
Frequency response method refers to: the amplitude-frequency response characteristic detecting each winding of transformer, and carries out vertical or horizontal comparison to testing result, according to the difference of amplitude-frequency response characteristic, to judge the testing inspection analytical approach of the contingent winding deformation of transformer.
Voltage ratio method of testing refers to: the voltage between each winding of test transformer, and compares with factory-said value, to judge whether Transformer Winding alternate or turn-to-turn short circuit occurs, and then causes the determination method of winding deformation.
Winding capacitance method refers to: the electric capacity between each winding of measuring transformer and winding-to-earth capacity, and compares with name plate rating, to judge the determination method of the deformation such as whether Transformer Winding is subjected to displacement.
Further, the concrete steps obtaining short-circuit impedance rate of change described in step 1 are as follows:
Measure the short-circuit impedance Z between high pressure winding and middle pressure winding
h-M, short-circuit impedance Z between high pressure winding and low pressure winding
h-L, short-circuit impedance Z between middle pressure winding and low pressure winding
m-L; According to formula
obtain short-circuit impedance relative change rate A
0; Wherein, Z
0represent short-circuit impedance initial value; Z
1for Z
h-Mor Z
h-Lor Z
m-L.
Further, overall related coefficient acquisition process described in step 1 is: according to standard DLT911-2004 " frequency response analysis of winding deformation of power transformer " lateral comparison approach, record the amplitude-frequency response of low pressure, middle pressure, high pressure winding, then calculate the related coefficient of the different curve of same winding respectively, use B
1represent.
Further, the partial auto-correlation of the basic, normal, high frequency range amplitude frequency curve described in step 1, according to standard DLT911-2004 " frequency response analysis of winding deformation of power transformer " lateral comparison approach, record the amplitude-frequency response of low pressure, middle pressure, high pressure winding, obtain amplitude-frequency response Wave crest and wave trough change in location information, low-frequency range is belonged to according to 1kHz ~ 100kHz, 100kHz ~ 600kHz belongs to Mid Frequency, >600kHz belongs to high band demarcation interval, and obtain the curve correlation coefficient in each interval respectively, use B
21, B
22, B
23represent.
Further, the obtaining step of the voltage ratio deviation described in step 1 is specific as follows: according to different tap positions, measures high pressure centering pressure respectively, middle pressure to the voltage of low pressure, uses m to low pressure and high pressure
irepresent; The starting potential m at tap position place
0represent; Voltage ratio deviation C
0represent, according to formula
Obtain C
0;
Wherein, m
0for m
h-Mor m
m-Lor m
h-L; m
h-Mfor tap position place high pressure centering pressure initial voltage, m
h-Lfor pressing low pressure initial voltage in tap position place, m
h-Lfor tap position place high pressure is to the initial voltage of low pressure;
M
ifor m
iH-Mor m
iM-Lor m
iH-L; m
iH-Mfor the voltage of tap position place high pressure centering pressure, m
iM-Lfor pressing the voltage to low pressure in tap position place, m
iH-Lfor tap position place high pressure is to the voltage of low pressure.
Further, the concrete steps obtaining relative change rate described in step 1 are as follows: obtain the electric capacity C between high pressure winding and middle pressure winding "
h-M, electric capacity C between middle pressure winding and low pressure winding "
m-L, electric capacity C between high pressure winding and low pressure winding "
h-L; Obtain high pressure winding-to-earth capacity C'
h, middle pressure winding-to-earth capacity C'
m, low pressure winding-to-earth capacity C'
l;
According to formula
obtain interwinding capacity relative change rate D
1:
According to formula
obtain winding-to-earth capacity relative change rate D
2:
Wherein: C "
0for interwinding capacity initial value, C'
0for ground capacitance initial value; C " for C "
h-Mor C "
m-Lor C "
h-L; C' is C'
hor C'
mor C'
l.
Further, the step obtaining winding deformation degree detecting result described in step 2 is specific as follows:
By relative change rate A
0be divided into four grades, obtain the first elementary evaluation result E according to following table
1;
By overall related coefficient B
1be divided into four grades, obtain the second elementary evaluation result E according to following table
2;
By elementary evaluation result and relative effect fac-tor, obtain secondary evaluation result, summation obtains result AB, is expressed as follows:
AB＝F
1+F
2＝E
1×p
1+E
2×q
1
Wherein: p
1for the short circuit impedance method testing result relative effect factor, q
1for the frequency response overall correlation coefficient process testing result relative effect factor; F
1, F
2for secondary evaluation result;
The result AB of each mutually each winding is judged according to following table, obtains winding deformation degree detecting result;
Further, the turn-to-turn described in step 3 or between cake the obtaining step of short circuit evaluation result BC specific as follows: by low-frequency range amplitude frequency curve related coefficient B
21be divided into four grades, determine the 3rd elementary evaluation result E according to following table
3;
By voltage ratio deviation C
0arrange according to the following formula, obtain reacting each winding voltage than deviation relative quantity
Wherein,
for
or
or
c
0H-Mfor winding voltage ratio deviation between high pressure and middle pressure, C
0H-Lfor winding voltage ratio deviation between high pressure and low pressure, C
0M-Lfor winding voltage ratio deviation between middle pressure and low pressure;
4th elementary evaluation result E
4according to following table value:
By elementary evaluation result and relative effect fac-tor, obtain secondary evaluation result, summation obtains result BC, is expressed as follows:
BC＝F
3+F
4＝E
3×p
2+E
4×q
2
Wherein, p
2for the frequency response low-frequency range correlation coefficient process testing result relative effect factor, q
2for the voltage ratio method of testing testing result relative effect factor; F
3, F
4for secondary evaluation result;
The result BC of each mutually each winding is judged according to following table, draws the shape changing detection result such as short circuit between turn-to-turn or cake;
Further, the local deformation evaluation result BD such as the winding distortion described in step 4 or bulge
1obtaining step is specific as follows:
By Mid Frequency amplitude frequency curve related coefficient B
22be divided into Three Estate, determine the 5th elementary evaluation result E according to following table
5;
By interwinding capacity relative change rate D
1the 6th elementary evaluation result E is determined according to following table
6;
By elementary evaluation result and relative effect fac-tor, obtain secondary evaluation result, summation obtains result BD
1, be expressed as follows:
BD
1＝F
5+F
6＝E
5×p
3+E
6×q
3
Wherein, p
3for the frequency response Mid Frequency related coefficient testing result relative effect factor, q
3for the capacitance method testing result relative effect factor between winding; F
5, F
6for secondary evaluation result;
By the result BD of each mutually each winding
1judge according to following table, draw winding Deformation Types and the degree detecting result of the local deformations such as winding distortion or bulge;
Further, the winding coil global displacement described in step 5 or lead-in wire displacement deformation evaluation result BD
2obtaining step is specific as follows:
By high band amplitude frequency curve related coefficient B
23be divided into Three Estate, determine the 7th elementary evaluation result E according to following table
7;
By winding-to-earth capacity relative change rate D
2the 8th elementary evaluation result E is determined according to following table
8;
By elementary evaluation result and relative effect fac-tor, obtain secondary evaluation result, summation obtains result BD
2, be expressed as follows:
BD
2＝F
7+F
8＝E
7×p
4+E
8×q
4
Wherein, p
4for the frequency response high band correlation coefficient process testing result relative effect factor, q
4for the winding electric capacity ground capacitance method testing result relative effect factor; F
7, F
8for secondary evaluation result;
By the result BD of each mutually each winding
2judge according to following table, draw Deformation Types and the degree detecting result such as winding coil global displacement or lead-in wire displacement;
Step 2,3, relative effect factor p described in 4,5
n, q
nspecifically be expressed as follows:
Wherein, x
n, y
nrepresent the confidence level of detection method;
N desirable 1,2,3,4, and 0≤x
n≤ 1,0≤y
n≤ 1,0≤p
n≤ 1,0≤q
n≤ 1.
In general, the above technical scheme conceived by the present invention compared with prior art, due to by existing frequency response method, short circuit impedance method, winding capacitance method, 4 kinds of methods such as voltage ratio method of testing combine, first single method is adopted to obtain the tested results, then according to the criterion that the present invention proposes, each test result is analyzed, obtain elementary testing result, again in conjunction with the relative effect factor of various method of testing, obtain different deformation separate, winding, the secondary testing result such as type and the order of severity, operate finally by logical OR, obtain deformation of transformer winding test result more accurately.Therefore, following beneficial effect can be obtained: effective reduce the impact of subjective factor on test and testing result, give full play to the advantage of various test method when detecting winding deformation, avoid the limitation of single method when judging winding deformation, improve winding deformation and detect the accuracy and reliability analyzed, the waste of the man power and material that minimizing brings due to erroneous judgement, and the economic loss caused is overhauled in power-off.
Accompanying drawing explanation
Fig. 1 is the process schematic diagram of comprehensive analysis method of the present invention;
Fig. 2 is that the present invention judges the winding of deformation and separate result schematic diagram occur;
Fig. 3 is that the present invention judges short circuit schematic diagram between winding inter-turn or cake;
Fig. 4 is that the present invention judges the local deformation result schematic diagrams such as winding distortion or bulge;
Fig. 5 is that the present invention judges winding coil global displacement or lead-in wire displacement deformation analysis process schematic diagram.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of detection method of winding deformation of power transformer, on the basis of existing technology, comprehensive utilization short circuit impedance method, voltage ratio test, the test of winding capacitance method, voltage ratio, incorporate the long-term work experience process test result of engineering staff, 4 kinds of testing results are analyzed, logical process is carried out to all testing results, obtains comprehensive detection result.Concentrate the advantage of various method, outstanding various method is in the advantage detecting a certain winding deformation, and the advantage that realizes maximizes, and is obtained the comprehensive analysis of result, improve accuracy and the reliability of deformation of transformer winding analyzing and diagnosing by multiple detection method.
Be illustrated in figure 1 the process schematic diagram of analytical approach provided by the invention, comprise the following steps:
Step 1: obtain short-circuit impedance rate of change, concrete steps are as follows: measure the short-circuit impedance Z between high pressure winding and middle pressure winding
h-M, short-circuit impedance Z between high pressure winding and low pressure winding
h-L, short-circuit impedance Z between middle pressure winding and low pressure winding
m-L;
According to formula
obtain short-circuit impedance relative change rate A
0; Wherein, Z
0represent short-circuit impedance initial value; Z
1for Z
h-Mor Z
h-Lor Z
m-L.
According to standard DLT911-2004 " frequency response analysis of winding deformation of power transformer " lateral comparison approach, record the amplitude-frequency response of low pressure, middle pressure, high pressure winding, then calculate the related coefficient B of the different curve of same winding respectively
1;
According to standard DLT911-2004 " frequency response analysis of winding deformation of power transformer " lateral comparison approach, record the amplitude-frequency response of low pressure, middle pressure, high pressure winding, obtain amplitude-frequency response Wave crest and wave trough change in location information, low-frequency range is belonged to according to 1kHz ~ 100kHz, 100kHz ~ 600kHz belongs to Mid Frequency, >600kHz belongs to high band demarcation interval, and obtains the curve correlation coefficient B in each interval respectively
21, B
22, B
23;
According to different tap positions, measure high pressure centering pressure, middle pressure respectively to low pressure and high pressure to the voltage m of low pressure
i; According to formula
obtain voltage ratio deviation C
0;
Wherein, m
0represent tap position place high pressure centering pressure, middle pressure to low pressure and high pressure to the starting potential of low pressure.
Obtain relative change rate, concrete steps are as follows: measure the electric capacity C between high pressure winding and middle pressure winding "
h-M, electric capacity C between middle pressure winding and low pressure winding "
m-L, electric capacity C between high pressure winding and low pressure winding "
h-L; Measure high pressure winding-to-earth capacity C'
h, middle pressure winding-to-earth capacity C'
m, low pressure winding-to-earth capacity C'
l;
According to formula
obtain interwinding capacity relative change rate D
1;
According to formula
obtain winding-to-earth capacity relative change rate D
2;
Wherein: C "
0for interwinding capacity initial value, C'
0for ground capacitance initial value; C " for C "
h-Mor C "
m-Lor C "
h-L; C' is C'
hor C'
mor C'
l.
Step 2: ask for and the winding of deformation and separate evaluation result AB occur, obtains winding that deformation occurs and the shape changing detection conclusion G such as separate
1; Basic process is as shown in Figure 2, specific as follows: according to short-circuit impedance relative change rate A
0with the overall related coefficient B of amplitude frequency curve
1, obtain elementary evaluation result E respectively
1, E
2, specific as follows:
By relative change rate A
0be divided into four grades, obtain the first elementary evaluation result E according to following table
1:
By overall related coefficient B
1be divided into four grades, obtain the second elementary evaluation result E according to following table
2;
By elementary evaluation result and relative effect factor p
1, q
1be multiplied, obtain secondary evaluation result F
1, F
2, summation obtains result AB, is expressed as follows:
AB＝F
1+F
2＝E
1×p
1+E
2×q
1
The result AB of each mutually each winding is judged according to following table, draws winding and the shape changing detection conclusion G such as separate that deformation occurs
1:
Step 3: ask for short circuit evaluation result BC between turn-to-turn or cake, obtains short-circuit detecting conclusion G between turn-to-turn or cake
2; Basic process is as shown in Figure 3, specific as follows:
According to the related coefficient B of low-frequency range amplitude frequency curve
21with voltage ratio deviation C
0, obtain elementary evaluation result E respectively
3, E
4, specific as follows:
By low-frequency range amplitude frequency curve related coefficient B
21be divided into four grades, determine the 3rd elementary evaluation result E according to following table
3;
By voltage ratio deviation C
0arrange according to the following formula, obtain reacting each winding voltage than deviation relative quantity
Wherein,
for
or
or
c
0H-Mfor winding voltage ratio deviation, C between high pressure and middle pressure
0H-Lfor winding voltage ratio deviation, C between high pressure and low pressure
0M-Lfor winding voltage ratio deviation between middle pressure and low pressure;
4th elementary testing result E
4according to following table value:
By elementary evaluation result and relative effect factor p
2, q
2be multiplied, obtain secondary evaluation result F
3, F
4, summation obtains evaluation result BC, is expressed as follows:
BC＝F
3+F
4＝E
3×p
2+E
4×q
2
The result BC of each mutually each winding is judged according to following table, draws the shape changing detection conclusion G such as short circuit between turn-to-turn or cake
2:
Step 4: ask for the local deformation result BD such as winding distortion or bulge
1, obtain the shape changing detection conclusion G such as local deformation such as winding distortion or bulge
3; Basic process is as shown in Figure 4, specific as follows: according to the related coefficient B of Mid Frequency amplitude frequency curve
22with interwinding capacity relative change rate D
1, obtain elementary evaluation result E respectively
5, E
6, specific as follows:
By Mid Frequency amplitude frequency curve related coefficient B
22be divided into Three Estate, determine the 5th elementary evaluation result E according to following table
5;
By interwinding capacity relative change rate D
1the 6th elementary evaluation result E is determined according to following table
6;
By elementary evaluation result and relative effect factor p
3, q
3be multiplied, obtain secondary evaluation result F
5, F
6, summation obtains result BD
1, be expressed as follows:
BD
1＝F
5+F
6＝E
5×p
3+E
6×q
3
By the result BD of each mutually each winding
1judge according to following table, draw the local deformation test result G such as winding distortion or bulge
3:
Step 5: ask for winding coil global displacement or lead-in wire displacement deformation testing result BD
2, obtain global displacement or lead-in wire Displacement Analysis conclusion G
4; Basic process is as shown in Figure 5, specific as follows: according to the related coefficient B of high band amplitude frequency curve
23with winding-to-earth capacity relative change rate D
2, obtain elementary evaluation result E respectively
7, E
8, specific as follows:
By high band amplitude frequency curve related coefficient B
23be divided into Three Estate, determine the 7th elementary evaluation result E according to following table
7;
By winding-to-earth capacity relative change rate D
2the 8th elementary evaluation result E is determined according to following table
8;
By elementary evaluation result and relative effect factor p
4, q
4be multiplied, obtain secondary evaluation result F
7, F
8, summation obtains result BD
2, be expressed as follows:
BD
2＝F
7+F
8＝E
7×p
4+E
8×q
4
By the result BD of each mutually each winding
2judge according to following table, draw the shape changing detection conclusion G such as global displacement or lead-in wire displacement
4:
Step 6: by testing result G
1, G
2, G
3, G
4carry out logical OR operation, obtain comprehensive detection result G.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a detection method for winding deformation of power transformer, is characterized in that, said method comprising the steps of:
Step 1: adopt low-voltage short circuit impedance method to obtain the short-circuit impedance of winding, obtain short-circuit impedance relative change rate according to short-circuit impedance;
Frequency response method is adopted to obtain the overall related coefficient of winding amplitude-frequency response;
Adopt frequency response method to obtain the amplitude-frequency response Wave crest and wave trough change of the basic, normal, high frequency band of winding, obtain the partial auto-correlation of basic, normal, high frequency range amplitude-frequency response according to the change of amplitude-frequency response Wave crest and wave trough;
Voltage ratio method of testing is adopted to obtain winding transformation ratio, and voltage ratio deviation;
Adopt winding capacitance method, obtain the capacitance between winding, winding capacitance over the ground and interwinding capacity relative change rate, winding-to-earth capacity relative change rate;
Step 2: according to the overall related coefficient of short-circuit impedance relative change rate and amplitude-frequency response, obtains winding deformation degree detecting result;
Step 3: according to related coefficient and the voltage ratio deviation of low-frequency range amplitude frequency curve, obtains short-circuit detecting result between turn-to-turn or cake;
Step 4: according to related coefficient and the interwinding capacity relative change rate of Mid Frequency amplitude frequency curve, obtains winding distortion or bulge local deformation testing result;
Step 5: according to related coefficient and the winding-to-earth capacity relative change rate of high band amplitude frequency curve, obtains winding coil global displacement or lead-in wire Displacement-deformation testing result;
Step 6: short-circuit detecting result, local deformation testing result and winding coil global displacement between described winding deformation degree detecting result, turn-to-turn or cake or lead-in wire Displacement-deformation testing result are carried out logical OR operation, acquisition is used to indicate deformation happening part, the deformation of transformer winding comprehensive detection result of Deformation Types and deformation degree.
2. detection method as claimed in claim 1, is characterized in that, in step 1, according to formula
obtain described short-circuit impedance relative change rate A
0;
Wherein Z
0for short-circuit impedance initial value; Z
1for Z
h-Mor Z
h-Lor Z
m-L; Z
h-Mfor the short-circuit impedance between high pressure winding and middle pressure winding, Z
h-Lfor the short-circuit impedance between high pressure winding and low pressure winding, Z
m-Lfor the short-circuit impedance between middle pressure winding and low pressure winding.
3. detection method as claimed in claim 1, is characterized in that, in step 1, according to formula
obtain voltage ratio deviation C
0;
Wherein, m
0for m
h-Mor m
m-Lor m
h-L; m
h-Mfor tap position place high pressure centering pressure initial voltage, m
h-Lfor pressing low pressure initial voltage in tap position place, m
h-Lfor tap position place high pressure is to the initial voltage of low pressure;
M
ifor m
iH-Mor m
iM-Lor m
iH-L; m
iH-Mfor the voltage of tap position place high pressure centering pressure, m
iM-Lfor pressing the voltage to low pressure in tap position place, m
iH-Lfor tap position place high pressure is to the voltage of low pressure.
4. detection method as claimed in claim 1, is characterized in that, in step 1, according to formula
obtain interwinding capacity relative change rate D
1, and according to formula
obtain winding-to-earth capacity relative change rate D
2;
Wherein, C "
0for interwinding capacity initial value, C '
0for ground capacitance initial value; C " for C "
h-Mor C "
m-Lor C "
h-L; C "
h-Mfor the electric capacity between high pressure winding and middle pressure winding, C "
m-Lfor the electric capacity between middle pressure winding and low pressure winding, C "
h-Lfor the electric capacity between high pressure winding and low pressure winding;
C' is C'
hor C'
mor C'
l; C'
hfor high pressure winding-to-earth capacity, C'
mfor middle pressure winding-to-earth capacity, C'
lfor low pressure winding-to-earth capacity.
5. detection method as claimed in claim 1, it is characterized in that, the concrete steps obtaining winding deformation degree detecting result described in step 2 are as follows:
Short-circuit impedance relative change rate scope is preset as 4 grades, obtains the first elementary evaluation result E according to the value place grade of short-circuit impedance relative change rate
1; Overall related coefficient is divided into 3 grades, obtains the second elementary evaluation result E according to overall correlation coefficient value place grade
2;
According to the first elementary evaluation result E
1, the second elementary evaluation result E
2with formula AB=E
1× p
1+ E
2× q
1, obtain winding and separate evaluation result AB that deformation occurs;
Winding and separate evaluation result are preset as 4 grades corresponding with deformation degree, carry out deformation judgement according to each mutually each winding AB value place grade, obtain winding deformation degree detecting result;
Wherein, p
1for the short circuit impedance method testing result relative effect factor, q
1for the frequency response overall correlation coefficient process testing result relative effect factor.
6. detection method as described in claim 1, it is characterized in that, the concrete steps obtaining short-circuit detecting result between turn-to-turn or cake described in step 3 are as follows:
Low-frequency range amplitude frequency curve related coefficient is divided into 4 grades, determines the 3rd elementary evaluation result E according to low-frequency range amplitude frequency curve correlation coefficient value place grade
3;
Each winding voltage is obtained than deviation relative quantity according to following formula
for
or
or
Will
be divided into 3 grades, according to
the 4th elementary testing result E is determined in the interval range interval at value place
4;
According to the 3rd elementary evaluation result E
3, the 4th elementary evaluation result E
4with formula BC=E
3× p
2+ E
4× q
2, obtain short circuit evaluation result BC between turn-to-turn or cake;
Short circuit evaluation result between turn-to-turn or cake is preset as 4 grades corresponding with winding Deformation Types and deformation degree, judges according to each mutually each winding BC value place grade, obtain short-circuit detecting result between turn-to-turn or cake;
Wherein, C
0H-Mfor winding voltage ratio deviation between high pressure and middle pressure, C
0H-Lfor winding voltage ratio deviation between high pressure and low pressure, C
0M-Lfor winding voltage ratio deviation between middle pressure and low pressure; p
2for the frequency response low-frequency range correlation coefficient process testing result relative effect factor, q
2for the voltage ratio method of testing testing result relative effect factor.
7. detection method as described in claim 1, it is characterized in that, the concrete steps obtaining the local deformation testing results such as winding distortion or bulge described in step 4 are as follows:
Mid Frequency amplitude frequency curve related coefficient is divided into 3 grades, determines the 5th elementary evaluation result E according to Mid Frequency amplitude frequency curve correlation coefficient value place grade
5; By interwinding capacity relative change rate D
1be divided into 4 grades, according to D
1value place grade obtains the 6th elementary evaluation result E
6;
According to the 5th elementary evaluation result E
5, the 6th elementary evaluation result E
6with formula BD
1=E
5× p
3+ E
6× q
3, obtain local deformation evaluation result BD
1;
Local deformation evaluation result is preset as 4 grades corresponding with winding Deformation Types and deformation degree, according to each mutually each winding BD
1value place grade judges, obtains local deformation testing result;
Wherein, p
3for the frequency response Mid Frequency related coefficient testing result relative effect factor, q
3for the capacitance method testing result relative effect factor between winding.
8. as described in claim 1 detection method, is characterized in that, the acquisition winding coil global displacement described in step 5 or lead-in wire Displacement-deformation type and degree detecting result concrete steps as follows:
High band amplitude frequency curve related coefficient is divided into 3 grades, determines the 7th elementary evaluation result E according to high band amplitude frequency curve correlation coefficient value place grade
7; By winding-to-earth capacity relative change rate D
2be divided into 4 grades, according to D
2the grade of value correspondence determines the 8th elementary evaluation result E
8;
According to the 7th elementary evaluation result E
7, the 8th elementary evaluation result E
8with formula BD
2=E
7× p
4+ E
8× q
4, obtain winding coil global displacement or lead-in wire Displacement-deformation evaluation result BD
2;
Winding coil global displacement or lead-in wire Displacement-deformation evaluation result are preset as 4 grades corresponding with winding Deformation Types and degree, according to each mutually each winding BD
2value place grade judges, obtains winding coil global displacement or lead-in wire Displacement-deformation testing result;
Wherein, p
4for the frequency response high band correlation coefficient process testing result relative effect factor, q
4for the winding electric capacity ground capacitance method testing result relative effect factor.
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| CN105823960A (en) * | 2016-03-18 | 2016-08-03 | 国家电网公司 | Method and system for comprehensively diagnosing deformation of transformer winding |
| CN106443229A (en) * | 2016-08-04 | 2017-02-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Transformer winding deformation diagnosis method |
| CN108279359A (en) * | 2018-02-05 | 2018-07-13 | 国网山西省电力公司电力科学研究院 | Dry-type reactor interturn insulation method for diagnosing faults based on frequency response analysis |
| CN108646132A (en) * | 2018-03-26 | 2018-10-12 | 国网湖南省电力有限公司 | A kind of winding deformation diagnostic method based on transformer winding frequency response data Characteristic Extraction |
| CN108693432A (en) * | 2018-04-27 | 2018-10-23 | 国家电网公司 | A kind of tester of deformation of transformer winding |
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| CN110006325A (en) * | 2019-03-11 | 2019-07-12 | 国网江苏省电力有限公司淮安供电分公司 | A kind of deformation of transformer winding intelligent detecting method based on frequency sweep impedance |
| CN111007320A (en) * | 2019-12-27 | 2020-04-14 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation fault positioning detection method |
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| CN108646132A (en) * | 2018-03-26 | 2018-10-12 | 国网湖南省电力有限公司 | A kind of winding deformation diagnostic method based on transformer winding frequency response data Characteristic Extraction |
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| CN108693432A (en) * | 2018-04-27 | 2018-10-23 | 国家电网公司 | A kind of tester of deformation of transformer winding |
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