CN110161381A - A kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave - Google Patents
A kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave Download PDFInfo
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- CN110161381A CN110161381A CN201910357607.8A CN201910357607A CN110161381A CN 110161381 A CN110161381 A CN 110161381A CN 201910357607 A CN201910357607 A CN 201910357607A CN 110161381 A CN110161381 A CN 110161381A
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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
- 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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
Abstract
This application provides a kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave, by building experiment porch, the different dampness states of analog casing insulation, measurement casing normally with the oscillation wave profile in the case of dampness and remove dryness fitting, the decaying similarity of calculated curve judges whether casing makes moist, then the equivalent area similarity of curve is further calculated to judge the damp degree of set pipe insulation, the appraisal procedure of the casing humidified insulation degree provided through the invention can have the damp degree of convenient and efficient, simple accurately judgement set pipe insulation.
Description
Technical field
This application involves external insulation of transformer status assessment field more particularly to a kind of bushings shell for transformer based on oscillation wave
Humidified insulation state evaluating method.
Background technique
With the rapid development of the national economy, power grid construction scale gradually expands, the usage quantity of power transformer is quick
Increase, the casing group parts one of indispensable as power transformer, usage quantity is also growing day by day.Bushing is not
It only plays and the high and low pressure lead of inside transformer is guided to except fuel tank, but also there is support, anchor leg and realization
With the effect of external electrical network connection, wanted it is therefore desirable to which it must satisfy certain the dual of electrical strength and mechanical strength
It asks.But in recent years, according to relevant unit to the statistics and analysis of Accident of Transformer all over China and reason, failure caused by casing
The ratio for accounting for transformer total failare is higher and higher, therefore the detection of reinforcing sleeve state of insulation is particularly significant.
Dampness is to be commonly used to the side of detection casing dampness in engineering at present one of the main reason for causing casing insulation fault
Method has power frequency dielectric loss and capacity measurement, but often has casing by breaking down very after the preventive trials such as dielectric loss and capacity measurement
To the case where explosion, but the sensitivity of dielectric loss and capacity measurement is inadequate, cannot find the dampness state of casing in time.
Summary of the invention
This application provides a kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave, it is existing to solve
The sensitivity of the method dielectric loss and capacity measurement that detect casing dampness is inadequate, cannot find asking for the dampness state of casing in time
Topic.
This application provides a kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave, the method packet
It includes:
Reference oscillation wave profile and oscillating curve to be assessed are obtained, the reference oscillation wave profile is the vibration of normal transformer
Swing wave profile；
Denoising is carried out to the reference oscillation wave profile and oscillating curve to be assessed, the reference oscillation after being removed dryness
Wave profile and oscillating curve to be assessed；
Using priming least square method respectively to after removing dryness reference oscillation wave profile and oscillating curve to be assessed intend
It closes, obtains reference oscillation curve line function and oscillating curve function to be assessed；
According to the reference oscillation curve line function and oscillating curve function to be assessed, according to the first preset formula, respectively
The attenuation coefficient of reference oscillation wave profile corresponding attenuation coefficient and oscillating curve to be assessed is calculated；
It is pre- according to second using the attenuation coefficient of reference oscillation wave profile corresponding attenuation coefficient and oscillating curve to be assessed
If formula, the decaying similarity of the reference oscillation curve line function and oscillating curve function to be assessed is calculated；
If the decaying similarity is less than or equal to 0.9, covers pipe insulation and do not make moist；
It is bent according to the reference oscillation curve line function and oscillation to be assessed if the decaying similarity is greater than 0.9
Normalized parameter is calculated in line function；
According to the normalized parameter, bushing shell for transformer humidified insulation degree is determined.
Further, the reference oscillation wave profile and oscillating curve to be assessed are by analogue transformer casing humidified insulation shape
The test platform of state generates, and the test platform of the analogue transformer casing humidified insulation state includes impulse generator, dampness
Simulator, transformer model, oscillograph and data collection station；
The transformer model includes shell, and insulating oil is filled in the shell；
Iron core, high-pressure side neutrality casing and three phase-change pressure components are equipped in the shell；
Every phase-change pressure component includes high-pressure side pipe sleeve, low-pressure side pipe sleeve, high-voltage winding, primary insulation paper, outer layer insulation
Paper and low pressure winding；The high-voltage winding, outer layer insulation paper, low pressure winding and outer layer insulation paper are in concentric circles knot from outside to inside
Structure is wrapped on iron core；One end of the high-voltage winding and high-pressure side casing connection, the low pressure winding and low-pressure side casing connect
It connects；
The other end of the high-voltage winding of every phase high potential assembly is connected, and junction is connected with high-pressure side neutrality casing；Often
The low pressure winding of phase transformer component joins end to end in connection delta；
The oscillograph is connect by high-voltage probe with casing guide rod, and the data collection station is connect with oscillograph；
The dampness simulator is connected between casing guide rod and corresponding bottom shielding of bushing；
The dampness simulator includes multiple capacitors, and each capacitor is serially connected with switch respectively.
Further, the reference oscillation curve line function isWherein, U1For reference
The fitting voltage parameter of oscillation wave, ω1For the angular frequency of reference oscillation wave, σ1For the attenuation coefficient of reference oscillation wave profile, Z1
It (t) is reference oscillation curve line function；
The oscillation wave curvilinear function to be assessed isWherein, U2For oscillation to be assessed
The fitting voltage parameter of wave, ω2For the angular frequency of oscillation wave to be assessed, σ2For the attenuation coefficient of oscillation wave profile to be assessed, Z2
It (t) is oscillation wave curvilinear function to be assessed.
Further, first preset formula isWherein, f1For reference oscillation curve line function Z1
(t) frequency, f2For oscillation wave curvilinear function Z to be assessed2(t) frequency,For reference oscillation curve line function Z1(t)
(n-1)th resonance point peak value,For reference oscillation curve line function Z1(t) n-th of resonance point peak value,It is to be assessed
Oscillation wave curvilinear function Z2(t) (n-1)th resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th
A resonance point peak value, σ1For the attenuation coefficient of reference oscillation wave profile, σ2For the attenuation coefficient of oscillation wave profile to be assessed.
Further, second preset formula isWherein, η is decaying similarity, σ1
For the attenuation coefficient of reference oscillation wave profile, σ2For the attenuation coefficient of oscillation wave profile to be assessed.
Further, described according to the reference oscillation curve line function and oscillating curve function to be assessed, it is calculated
Normalized parameter includes:
It is calculated according to the reference oscillation curve line function and oscillating curve function to be assessed according to following formula
To equivalent area similarity；
Wherein,For reference oscillation curve
Line function Z1(t) n-th of resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th of resonance point peak value,
X1(ts) it is reference oscillation curve line function Z1(t) the amplitude after waveform stabilization, X2(ts) it is oscillation wave curvilinear function to be assessed
Z2(t) the amplitude after waveform stabilization, D are equivalent area similarity；
The equivalent area similarity is normalized according to following formula, obtains normalized parameter；
Wherein,For reference oscillation curve line function Z1
(t) n-th of resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th of resonance point peak value, X1(ts) be
Reference oscillation curve line function Z1(t) the amplitude after waveform stabilization, X2(ts) it is oscillation wave curvilinear function Z to be assessed2(t)
Amplitude after waveform stabilization, D are equivalent area similarity, and R is normalized parameter.
Further, described according to the normalized parameter, determine that bushing shell for transformer humidified insulation degree includes:
If the normalized parameter is greater than or equal to 0.5 and less than or equal to 1.5, bushing shell for transformer insulation occurs light
Degree dampness；
If the normalized parameter be greater than 1.5 and be less than or equal to 2.7, bushing shell for transformer insulation occur moderate by
Tide；
If the normalized parameter is greater than 2.7, severe dampness occurs for bushing shell for transformer insulation.
From the above technical scheme, the bushing shell for transformer humidified insulation state based on oscillation wave that this application provides a kind of
Appraisal procedure, by building experiment porch, the different dampness states of analog casing insulation, measurement casing normally with dampness situation
Under oscillation wave profile and remove dryness fitting, the decaying similarity of calculated curve judges whether casing makes moist, then further meter
The equivalent area similarity of curve is calculated to judge the damp degree of set pipe insulation, the casing humidified insulation provided through the invention
The appraisal procedure of degree can have the damp degree of convenient and efficient, simple accurately judgement set pipe insulation.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of process of the bushing shell for transformer humidified insulation state evaluating method based on oscillation wave provided by the present application
Figure；
Fig. 2 is the structure chart of the test platform of analogue transformer casing humidified insulation state.
Wherein, 1- impulse generator, 2- dampness simulator, 3- transformer model, the high-pressure side 4- neutrality casing, 5- high pressure
Side A phase casing, the high-pressure side 6- B phase casing, the high-pressure side 7- C phase casing, 8- low-pressure side A phase casing, 9- low-pressure side B phase casing,
10- low-pressure side C phase casing, 11-A phase high-voltage winding, 12-A phase outer layer insulation paper, 13-A phase low pressure winding, 14-A phase internal layer are exhausted
Edge paper, 15- iron core, 16-B phase high-voltage winding, 17-B phase outer layer insulation paper, 18-B phase low pressure winding, 19-B phase primary insulation
Paper, 20-C phase high-voltage winding, 21-C phase outer layer insulation paper, 22-C phase low pressure winding, 23-C phase primary insulation paper, 24- shell,
25- insulating oil, 26- oscillograph, 27- data collection station, 28- casing guide rod, 29- bottom shielding of bushing.
Specific embodiment
Referring to Fig. 1, this application provides a kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave, institute
The method of stating includes:
Step 11: obtaining reference oscillation wave profile and oscillating curve to be assessed, the reference oscillation wave profile is normal becomes
The oscillation wave profile of depressor.
Reference oscillation wave profile and oscillating curve to be assessed by analogue transformer casing humidified insulation state test platform
It generates, referring to fig. 2, the test platform of the analogue transformer casing humidified insulation state includes impulse generator 1, dampness mould
Quasi- device 2, transformer model 3, oscillograph 26 and data collection station 27；
The transformer model 3 includes shell 24, is filled with insulating oil 25 in the shell 24；
Iron core 15, high-pressure side neutrality casing 4 and three phase-change pressure components are equipped in the shell；
Every phase-change pressure component includes high-pressure side pipe sleeve, low-pressure side pipe sleeve, high-voltage winding, primary insulation paper, outer layer insulation
Paper and low pressure winding；The high-voltage winding, outer layer insulation paper, low pressure winding and outer layer insulation paper are in concentric circles knot from outside to inside
Structure is wrapped on iron core；One end of the high-voltage winding and high-pressure side casing connection, the low pressure winding and low-pressure side casing connect
It connects；Specifically, A phase high-voltage winding 11, A phase outer layer insulation paper 12, A phase low pressure winding 13 and A phase primary insulation paper 14 with from
Be wrapped on iron core 15 to interior in concentric structure outside, A phase high-voltage winding 11, A phase low pressure winding 13 respectively with high-pressure side A phase
Casing 5, low-pressure side A phase casing 8 are connected, B phase high-voltage winding 16, B phase outer layer insulation paper 17, B phase low pressure winding 18 and B
Phase primary insulation paper 19 equally to be in that concentric structure is wrapped on iron core 15 from outside to inside, B phase high-voltage winding 16, B phase low pressure
Winding 18 is connected with high-pressure side B phase casing 6, low-pressure side B phase casing 9 respectively, C phase high-voltage winding 20, C phase outer layer insulation paper 21,
C phase low pressure winding 22 and C phase primary insulation paper 23 equally to be in that concentric structure is wrapped on iron core 15 from outside to inside, C phase
High-voltage winding 20, C phase low pressure winding 22 are connected with high-pressure side C phase casing 7, low-pressure side C phase casing 10 respectively.
The other end of the high-voltage winding of every phase high potential assembly is connected, and junction is connected with high-pressure side neutrality casing；Often
The low pressure winding of phase transformer component joins end to end in connection delta；Specifically, referring to fig. 2, A phase high-voltage winding 11, B phase high pressure
Winding 16 and the other end of C phase high-voltage winding 20 are connected and access high-pressure side neutrality casing 4, and A phase low pressure winding 13, B phase are low
Pressure winding 18 and C phase low pressure winding 22 join end to end in connection delta.
The oscillograph 26 is connect by high-voltage probe with casing guide rod 28, the data collection station 27 and oscillograph
26 connections；
The dampness simulator 2 is connected between casing guide rod 28 and corresponding bottom shielding of bushing 29；
The dampness simulator 2 includes multiple capacitors, and such as C1, C2 and C3 in Fig. 2, each capacitor is serially connected with out respectively
It closes, such as S1, S2 and S3 in Fig. 2.Using button A1, A2 and A3 in Fig. 2, the opening and closing of control switch S1, S2 and S3 are distinguished,
Can analog casing humidified insulation degree, then corresponding oscillating curve to be assessed is obtained by oscillograph, if not accessing dampness mould
Quasi- device 3, then oscillograph obtains reference oscillation curve.
Step 12: denoising being carried out to the reference oscillation wave profile and oscillating curve to be assessed, after being removed dryness
Reference oscillation wave profile and oscillating curve to be assessed.
Wavelet transformation formula is as follows:
Wherein, a is contraction-expansion factor, and b is shift factor, and ψ (t) is Molert wavelet basis function, Wf(a, b) is X1(t) with
X2(t) function after continuous wavelet transform, C ψ are wavelet conversion coefficients.
Step 13: using priming least square method respectively to after removing dryness reference oscillation wave profile and oscillating curve to be assessed
It is fitted, obtains reference oscillation curve line function and oscillating curve function to be assessed.
The reference oscillation curve line function isWherein, U1For the quasi- of reference oscillation wave
Close voltage parameter, ω1For the angular frequency of reference oscillation wave, σ1For the attenuation coefficient of reference oscillation wave profile, Z1(t) for reference to vibration
Swing curve line function；
The oscillation wave curvilinear function to be assessed isWherein, U2For oscillation to be assessed
The fitting voltage parameter of wave, ω2For the angular frequency of oscillation wave to be assessed, σ2For the attenuation coefficient of oscillation wave profile to be assessed, Z2
It (t) is oscillation wave curvilinear function to be assessed.
。
Step 14: according to the reference oscillation curve line function and oscillating curve function to be assessed, according to the first default public affairs
Formula calculates separately to obtain the attenuation coefficient of reference oscillation wave profile corresponding attenuation coefficient and oscillating curve to be assessed.
First preset formula isIts
In, f1For reference oscillation curve line function Z1(t) frequency, f2For oscillation wave curvilinear function Z to be assessed2(t) frequency,
For reference oscillation curve line function Z1(t) (n-1)th resonance point peak value,For reference oscillation curve line function Z1(t) n-th
A resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) (n-1)th resonance point peak value,It is to be evaluated
Estimate oscillation wave curvilinear function Z2(t) n-th of resonance point peak value, σ1For the attenuation coefficient of reference oscillation wave profile, σ2It is to be evaluated
Estimate the attenuation coefficient of oscillation wave profile.
Step 15: using the attenuation coefficient of reference oscillation wave profile corresponding attenuation coefficient and oscillating curve to be assessed, pressing
According to the second preset formula, it is similar with the decaying of oscillating curve function to be assessed that the reference oscillation curve line function is calculated
Degree.
Second preset formula isWherein, η is decaying similarity, σ1For with reference to vibration
Swing the attenuation coefficient of wave profile, σ2For the attenuation coefficient of oscillation wave profile to be assessed.
Step 16: if the decaying similarity is less than or equal to 0.9, covering pipe insulation and do not make moist.
Step 17: if the decaying similarity is greater than 0.9, according to the reference oscillation curve line function and to be assessed
Oscillating curve function, is calculated normalized parameter.
Specific calculating process are as follows: according to the reference oscillation curve line function and oscillating curve function to be assessed, according to
Equivalent area similarity is calculated in following formula；
Wherein,For reference oscillation curve
Line function Z1(t) n-th of resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th of resonance point peak value,
X1(ts) it is reference oscillation curve line function Z1(t) the amplitude after waveform stabilization, X2(ts) it is oscillation wave curvilinear function to be assessed
Z2(t) the amplitude after waveform stabilization, D are equivalent area similarity；
The equivalent area similarity is normalized according to following formula, obtains normalized parameter；
Wherein,For reference oscillation curve line function Z1
(t) n-th of resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th of resonance point peak value, X1(ts) be
Reference oscillation curve line function Z1(t) the amplitude after waveform stabilization, X2(ts) it is oscillation wave curvilinear function Z to be assessed2(t)
Amplitude after waveform stabilization, D are equivalent area similarity, and R is normalized parameter.
Step 18: according to the normalized parameter, determining bushing shell for transformer humidified insulation degree.
If the normalized parameter is greater than or equal to 0.5 and less than or equal to 1.5, bushing shell for transformer insulation occurs light
Degree dampness；If the normalized parameter be greater than 1.5 and be less than or equal to 2.7, bushing shell for transformer insulation occur moderate by
Tide；If the normalized parameter is greater than 2.7, severe dampness occurs for bushing shell for transformer insulation.
From the above technical scheme, the bushing shell for transformer humidified insulation state based on oscillation wave that this application provides a kind of
Appraisal procedure, by building experiment porch, the different dampness states of analog casing insulation, measurement casing normally with dampness situation
Under oscillation wave profile and remove dryness fitting, the decaying similarity of calculated curve judges whether casing makes moist, then further meter
The equivalent area similarity of curve is calculated to judge the damp degree of set pipe insulation, the casing humidified insulation provided through the invention
The appraisal procedure of degree can have the damp degree of convenient and efficient, simple accurately judgement set pipe insulation.
Claims (7)
1. a kind of bushing shell for transformer humidified insulation state evaluating method based on oscillation wave, which is characterized in that the described method includes:
Reference oscillation wave profile and oscillating curve to be assessed are obtained, the reference oscillation wave profile is the oscillation wave of normal transformer
Curve；
Denoising is carried out to the reference oscillation wave profile and oscillating curve to be assessed, the reference oscillation curve after being removed dryness
Line and oscillating curve to be assessed；
Using priming least square method respectively to after removing dryness reference oscillation wave profile and oscillating curve to be assessed be fitted, obtain
To reference oscillation curve line function and oscillating curve function to be assessed；
It is calculated separately according to the reference oscillation curve line function and oscillating curve function to be assessed according to the first preset formula
Obtain the attenuation coefficient of reference oscillation wave profile corresponding attenuation coefficient and oscillating curve to be assessed；
Using the attenuation coefficient of reference oscillation wave profile corresponding attenuation coefficient and oscillating curve to be assessed, according to the second default public affairs
The decaying similarity of the reference oscillation curve line function and oscillating curve function to be assessed is calculated in formula；
If the decaying similarity is less than or equal to 0.9, covers pipe insulation and do not make moist；
If the decaying similarity is greater than 0.9, according to the reference oscillation curve line function and oscillating curve letter to be assessed
Number, is calculated normalized parameter；
According to the normalized parameter, bushing shell for transformer humidified insulation degree is determined.
2. the method as described in claim 1, which is characterized in that the reference oscillation wave profile and oscillating curve to be assessed are by mould
The test platform of quasi- bushing shell for transformer humidified insulation state generates, and the test of the analogue transformer casing humidified insulation state is flat
Platform includes impulse generator, dampness simulator, transformer model, oscillograph and data collection station；
The transformer model includes shell, and insulating oil is filled in the shell；
Iron core, high-pressure side neutrality casing and three phase-change pressure components are equipped in the shell；
Every phase-change pressure component include high-pressure side pipe sleeve, low-pressure side pipe sleeve, high-voltage winding, primary insulation paper, outer layer insulation paper and
Low pressure winding；The high-voltage winding, outer layer insulation paper, low pressure winding and outer layer insulation paper are in concentric structure winding from outside to inside
On iron core；One end of the high-voltage winding and high-pressure side casing connection, the low pressure winding and low-pressure side casing connection；
The other end of the high-voltage winding of every phase high potential assembly is connected, and junction is connected with high-pressure side neutrality casing；Every phase transformation
The low pressure winding of depressor component joins end to end in connection delta；
The oscillograph is connect by high-voltage probe with casing guide rod, and the data collection station is connect with oscillograph；
The dampness simulator is connected between casing guide rod and corresponding bottom shielding of bushing；
The dampness simulator includes multiple capacitors, and each capacitor is serially connected with switch respectively.
3. the method as described in claim 1, which is characterized in that the reference oscillation curve line function isWherein, U1For the fitting voltage parameter of reference oscillation wave, ω1For the angular frequency of reference oscillation wave
Rate, σ1For the attenuation coefficient of reference oscillation wave profile, Z1It (t) is reference oscillation curve line function；
The oscillation wave curvilinear function to be assessed isWherein, U2For oscillation wave to be assessed
It is fitted voltage parameter, ω2For the angular frequency of oscillation wave to be assessed, σ2For the attenuation coefficient of oscillation wave profile to be assessed, Z2(t) it is
Oscillation wave curvilinear function to be assessed.
4. the method as described in claim 1, which is characterized in that first preset formula isWherein, f1For reference oscillation wave profile letter
Number Z1(t) frequency, f2For oscillation wave curvilinear function Z to be assessed2(t) frequency,For reference oscillation curve line function Z1
(t) (n-1)th resonance point peak value,For reference oscillation curve line function Z1(t) n-th of resonance point peak value,For to
Assess oscillation wave curvilinear function Z2(t) (n-1)th resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t)
N-th of resonance point peak value, σ1For the attenuation coefficient of reference oscillation wave profile, σ2For the attenuation coefficient of oscillation wave profile to be assessed.
5. the method as described in claim 1, which is characterized in that second preset formula is
Wherein, η is decaying similarity, σ1For the attenuation coefficient of reference oscillation wave profile, σ2For the decaying system of oscillation wave profile to be assessed
Number.
6. the method as described in claim 1, which is characterized in that described according to the reference oscillation curve line function and to be assessed
Oscillating curve function, normalized parameter, which is calculated, includes:
It is calculated according to the reference oscillation curve line function and oscillating curve function to be assessed according to following formula
Imitate area similarity；
Wherein,For reference oscillation curve line function
Z1(t) n-th of resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th of resonance point peak value, X1(ts) be
Reference oscillation curve line function Z1(t) the amplitude after waveform stabilization, X2(ts) it is oscillation wave curvilinear function Z to be assessed2(t)
Amplitude after waveform stabilization, D are equivalent area similarity；
The equivalent area similarity is normalized according to following formula, obtains normalized parameter；
Wherein,For reference oscillation curve line function Z1(t) n-th
A resonance point peak value,For oscillation wave curvilinear function Z to be assessed2(t) n-th of resonance point peak value, X1(ts) it is reference oscillation
Curve line function Z1(t) the amplitude after waveform stabilization, X2(ts) it is oscillation wave curvilinear function Z to be assessed2(t) waveform stabilization
Amplitude afterwards, D are equivalent area similarity, and R is normalized parameter.
7. the method as described in claim 1, which is characterized in that it is described according to the normalized parameter, determine bushing shell for transformer
Humidified insulation degree includes:
If the normalized parameter be greater than or equal to 0.5 and be less than or equal to 1.5, bushing shell for transformer insulation occur slightly by
Tide；
If the normalized parameter is greater than 1.5 and is less than or equal to 2.7, bushing shell for transformer insulation generation moderate dampness；
If the normalized parameter is greater than 2.7, severe dampness occurs for bushing shell for transformer insulation.
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| CN114354698A (en) * | 2021-12-03 | 2022-04-15 | 西南交通大学 | Assessment method suitable for transformer bushing moisture content in high and cold environment |
| CN114355007A (en) * | 2021-12-02 | 2022-04-15 | 西南交通大学 | Oil-immersed transformer deformation diagnosis method based on self-oscillation |
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