CN105606045A - Method and system for judging deformation of power transformer winding - Google Patents

Method and system for judging deformation of power transformer winding Download PDF

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Publication number
CN105606045A
CN105606045A CN201510960703.3A CN201510960703A CN105606045A CN 105606045 A CN105606045 A CN 105606045A CN 201510960703 A CN201510960703 A CN 201510960703A CN 105606045 A CN105606045 A CN 105606045A
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CN
China
Prior art keywords
power transformer
winding
measuring point
diagnostic parameters
deformation
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CN201510960703.3A
Other languages
Chinese (zh)
Inventor
周国伟
黄海
郦于杰
邓华
李贤良
刘畅
王纶
Original Assignee
国家电网公司
国网浙江省电力公司
国网浙江省电力公司检修分公司
浙江大学
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Application filed by 国家电网公司, 国网浙江省电力公司, 国网浙江省电力公司检修分公司, 浙江大学 filed Critical 国家电网公司
Priority to CN201510960703.3A priority Critical patent/CN105606045A/en
Publication of CN105606045A publication Critical patent/CN105606045A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00Measuring arrangements characterised by the use of subsonic, sonic or ultrasonic vibrations
    • G01B17/04Measuring arrangements characterised by the use of subsonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string

Abstract

The invention discloses a method for judging the deformation of a power transformer winding, and the method comprises the steps: collecting vibration signals of all measurement points of the power transformer winding synchronously under the preset condition; extracting a single-frequency vibration attenuation curve corresponding to the inherent frequency of each order in each vibration signal; calculating the diagnosis parameter value of each measurement point of the power transformer winding according to the single-frequency vibration attenuation curves; judging whether the differences between the diagnosis parameter values and a diagnosis parameter mean value are within a preset range or not; determining that the corresponding measurement pint is normal if the difference between the diagnosis parameter value and the diagnosis parameter mean value is within the preset range, or else, determining that there is deformation of the winding at the corresponding measurement point. The method has no electrical connection, does not need to cut off power, and causes little impact on the whole power system. In addition, the method better reflects the mechanical structure of the winding based on a winding vibration generation mechanism. Moreover, the invention also discloses a system for judging the deformation of the power transformer winding.

Description

A kind of method and system that judge winding deformation of power transformer

Technical field

The present invention relates to power technology field, particularly relate to a kind of Winding in Power Transformer that judgesThe method and system of distortion.

Background technology

Large-scale power transformer is the key equipment in network system. Power Transformer Faults can be ledCause power transmission network and interrupt, and cause serious economic loss and social influence, therefore accurately monitoringWhether large-scale power transformer breaks down and ensures that the normal operation of transformer is very necessary. BecomeThe fault of depressor is divided into winding failure and fault unshakable in one's determination, and the possibility that winding failure occurs is higher,And winding failure has the greatest impact to transformer service life. Winding failure generally shows as winding pineMove or distortion, these faults may cause the serious situations such as winding interturn short-circuit to occur, andWinding is after breaking down, and the ability of Short Circuit withstand impulsive force can sharply decline, and easily occurs largerThe distortion of degree. Therefore winding state is assessed, judging whether to exist fault to have very much mustWant.

Conventional winding failure detection technique comprises frequency response method, short circuit impedance method and oil chromatographyAnalytic approach etc. Frequency response method is that swept-frequency signal is injected in winding one end, measures and passes at the other endThe transfer function of the calculated signals winding of passing, transfer function before and after then impacting according to windingChange calculations obtain winding and whether be out of shape. Short-circuit impedance rule is by measuring short circuit in winding resistanceWhether anti-variation detects winding and deforms. Oil chromatography analysis is according to the transformation recordingThe various gas content results of dissolving in device oil, analyze transformer insulated performance, therebyJudge whether transformer equipment inside breaks down. But there are some shortcomings in above three kinds of methods,First two method is low to the light moderate distortion diagnosis accuracy of winding, and secondly, these two kinds of methods allCan not be with electro-detection. Although Oil chromatography analysis can be used for being with electro-detection, to insideFrame for movement insensitive.

Summary of the invention

The object of this invention is to provide a kind of method that judges winding deformation of power transformer. ThisOutward, object of the present invention also provides a kind of system that judges winding deformation of power transformer.

For solving the problems of the technologies described above, the invention provides a kind of winding deformation of power transformer that judgesMethod, comprising:

Under predetermined condition, the vibration at each measuring point place of Winding in Power Transformer described in synchronous acquisitionSignal;

Extract single-frequency vibration attenuation song corresponding to every rank intrinsic frequency in each described vibration signalLine;

According to the each measuring point of Winding in Power Transformer described in described single-frequency vibration attenuation curve calculationDiagnostic parameters value;

Judge that whether the difference of described Diagnostic parameters value and Diagnostic parameters mean value is in default modelIn enclosing;

When the difference of described Diagnostic parameters value and Diagnostic parameters mean value is in described preset rangeWhen interior, determine that corresponding measuring point is for normal; Otherwise, determine that corresponding measuring point exists winding deformation.

Preferably, described predetermined condition comprises: lower electric process or short-circuit impact.

Preferably, described preset range is ± 20%.

Preferably, in the time that described Winding in Power Transformer is three phase windings, the number of described measuring pointBe 6, and be uniformly distributed in the tank surface of described power transformer.

A system that judges winding deformation of power transformer, comprising:

Collecting unit, under predetermined condition, Winding in Power Transformer described in synchronous acquisitionThe vibration signal at each measuring point place;

Extraction unit, for extracting the list corresponding to every rank intrinsic frequency of each described vibration signalFrequency vibration attenuation curve; According to power transformer described in described single-frequency vibration attenuation curve calculation aroundOrganize the Diagnostic parameters value of each measuring point;

Judging unit, for the difference that judges described Diagnostic parameters value and Diagnostic parameters mean value isNo in preset range;

Determining unit, for the difference when described Diagnostic parameters value and Diagnostic parameters mean value inIn described preset range time, determine that corresponding measuring point is for normal; Otherwise, determine corresponding measuring pointThere is winding deformation.

Preferably, described predetermined condition is lower electric process or short-circuit impact.

Preferably, described preset range is ± 20%.

Preferably, in the time that described Winding in Power Transformer is three phase windings, the number of described measuring pointBe 6, and be uniformly distributed in the tank surface of described power transformer.

Preferably, described collecting unit involving vibrations sensor, the quantity of described vibrating sensorIdentical with the quantity of described measuring point.

Preferably, also comprise: magnetic support, for described vibrating sensor is fixed on to described electric powerThe tank surface of transformer.

The method of judgement winding deformation of power transformer provided by the invention, by synchronous acquisition electricityThe vibration signal at each measuring point place of power Transformer Winding is intrinsic to extract every rank in each vibration signalSingle-frequency vibration attenuation curve corresponding to frequency is to calculate the Diagnostic parameters value of each measuring point. Due to normallyIn situation, Diagnostic parameters value is constant, or change very little, therefore when Diagnostic parameters value withThe difference of Diagnostic parameters mean value in preset range time, determines that corresponding measuring point is for normal;Otherwise, determine that corresponding measuring point exists winding deformation. This method and power transformer are without any electricityGas connects, and without transformer is carried out to power-off, very little to the influence on system operation of whole power system.In addition, this method, based on basket vibration mechanism of production, has reflected the frame for movement of winding better,Can be loosening to winding internal structure, the situation such as distortion detects.

Brief description of the drawings

In order to be illustrated more clearly in the embodiment of the present invention, below will be to required use in embodimentAccompanying drawing do simple introduction, apparently, the accompanying drawing in the following describes is only the present inventionSome embodiment, for those of ordinary skill in the art, do not paying creative workPrerequisite under, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the flow process of a kind of method that judges winding deformation of power transformer provided by the inventionFigure;

Fig. 2 is the distribution schematic diagram of the each measuring point of Winding in Power Transformer provided by the invention;

Fig. 3 is the structure of a kind of system that judges winding deformation of power transformer provided by the inventionFigure.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present inventionCase is clearly and completely described, and obviously, described embodiment is only one of the present inventionDivide embodiment, instead of whole embodiment. Based on the embodiment in the present invention, this area is commonTechnical staff is not making under creative work prerequisite, the every other embodiment obtaining,All belong to protection domain of the present invention.

Core of the present invention is to provide and a kind ofly judges the method for winding deformation of power transformer and beSystem.

In order to make those skilled in the art person understand better the present invention program, below in conjunction with accompanying drawingThe present invention is described in further detail with detailed description of the invention.

Embodiment mono-

Fig. 1 is the flow process of a kind of method that judges winding deformation of power transformer provided by the inventionFigure. As shown in Figure 1, judge the method for winding deformation of power transformer, comprising:

S10: under predetermined condition, each measuring point place of synchronous acquisition Winding in Power Transformer shakesMoving signal.

In concrete enforcement, choose multiple measuring points on power transformer fuel tank surface, by gatheringUnit, for example vibrating sensor, gathers the vibration signal at each measuring point place. Vibrating sensor is answered clothPut on the close tank surface of winding; Guarantee that the vertical direction of each winding is by two or twoAbove vibrating sensor covers.

It should be noted that the predetermined condition in the present invention can comprise: lower electric process or short circuit punchingHit. Lower electric process refers to transformer input (normally high-pressure side) this process of power-off.

S11: extract single-frequency vibration attenuation song corresponding to every rank intrinsic frequency in each vibration signalLine.

For the vibration signal of each measuring point collecting, first divide by Short Time Fourier Transform methodAnalyse rumble spectrum and distribute, and extract corresponding intrinsic frequency, the each peak on rumble spectrum figureValue is the intrinsic frequency of corresponding every single order respectively. According to the numerical value of every first natural frequency, establish respectivelyCount a bandpass filter, and utilize this wave filter again vibration signal to be carried out to filtering, finallyTo corresponding single-frequency vibration attenuation curve.

S12: according to the diagnosis of the each measuring point of single-frequency vibration attenuation curve calculation Winding in Power TransformerParameter value.

Set up an equivalent winding knot according to winding construction characteristic and insulating materials mechanical characteristicStructure consistency model, and estimate the DFR (Diagnostic parameters of each measuring point according to single-frequency attenuation curveValue).

Large-scale power transformer adopts disk-type winding conventionally, can think that a disk-type winding is mainFormed by copper conductor, cross-over block, insulating paper. Winding construction consistency model can be equivalent toA many-degrees of freedom system being formed by quality-spring-damping. According to the design feature of winding,Single layer coil is equivalent to a concentrated mass, insulation spacer is equivalent to an elasticity unitPart, the rigidity of iron core can be considered as infinity. The upper and lower side of winding is stiff end, the position at this placeMove is zero. k1,k2…,knRepresent the equivalent elastic coefficient of cross-over block between each coil,Herein, all coefficient of elasticity are thought consistent. c1,c2,…,cnFor transformer oil pairThe damped coefficient of each coil; m1,m2,…mnFor the equivalent mass of each coil. N individual layerThe Mdof Vibration System of coil has n the free degree, and the displacement of coil only has axiallyComponent, is respectively x1,x2,…xn. Corresponding each coil of transient oscillation stressed be zero feelingsThe free vibration occurring under condition, basket vibration equation is as follows:

[ M ] { x ·· } + [ C ] { x · } + [ K ] { x } = 0 - - - ( 1 )

Wherein, M, C, K are respectively mass matrix, damping matrix and stiffness matrix, and { x} is singleThe vector of individual coil displacements composition.

Insulating materials stiffness coefficient is shown below with the proportionate relationship of corresponding damped coefficient, thanExample coefficient η is a parameter relevant with frequency.

c i k i = 2 η ( ω ) , i = 1 , 2 , ... n + 1 - - - ( 2 )

For normal winding, all coils have identical stiffness coefficient and damped coefficient,Therefore the numerical values recited of this proportionality coefficient is fixed. In the time there is loosening or distortion in winding,Equivalent stiffness and damping all can change, and finally cause Diagnostic parameters value to change.

Mode superposition method is a kind of common method that solves multi-freedom-degree vibration. According to the method,The displacement size x of arbitrary free degreejCan be decomposed into:

x j = Σ n = 1 N q n D j n - - - ( 3 )

Wherein, N is free degree dimension, DjnIt is the j rank free degree in the orthogonal modes of n rankAmplitude, qnFor the vibration amplitude of each free degree under generalized coordinates.

Utilize mode superposition method to carry out decoupling zero to multi-freedom-degree vibration, final result is equivalent to eachSingle-mode system generation disturbance and exciting force F=0, and freely shaking of occurring in the time of time t=0Moving. In the time that damped coefficient is less than critical damping, the displacement of j coil can be equivalent to:

x j ( t ) = Σ n D j n e - ξω n t ( A n sinω d t + B n cosω d t ) - - - ( 4 )

Wherein AnAnd BnFor fixed value, only relevant with free degree initial displacement and speed

ωnIt is n rank undamped natural frequency of a mechanical system

ωdnFor undamped natural frequency of a mechanical system corresponding have a damped natural frequency, with the intrinsic frequency of undampedRelation between rate is shown below. For Transformer Winding, two frequency values are close,Can equivalence.

ωdn=ωn(1-ζ2)1/2(5)

Wherein, there is following fixed relationship in proportionality coefficient η and damped coefficient ζ:

η(ω)=ζ(ω)/ω(6)

Damped coefficient ζ is an amount relevant with frequency, and the damped coefficient under CF ω canObtain with the single-frequency vibration attenuation curve by corresponding. Suppose x0,x1,…xnRespectively vibration attenuationThe amplitude of continuous several crests on curve. In the time of damped coefficient ζ < 0.1, damped coefficient withApproximation relation between vibration peak is shown below.

&zeta; &ap; ( 1 - x i + 1 / x i ) 2 &pi; , i = 0 , 1 , ... , n ; - - - ( 7 )

Finally define a diagnostic characteristic amount DFR, be shown below:

D F R = 1 N &Sigma; i = 1 N &eta; ( &omega; i ) &omega; i ; - - - ( 8 )

Wherein, the number that N is frequency component.

DFR represents average damped coefficient corresponding to measuring point vibration. For a normal winding,Damped coefficient ζ should be one, and not with the amount of change of frequency, therefore DFR should be a constant,And the DFR value at diverse location place should be identical. When winding construction occurs when abnormal, due to structureBecome flexible and cause equivalent damping and equivalent stiffness to change, DFR is no longer constant with change of frequency.

S13: judge that whether the difference of Diagnostic parameters value and Diagnostic parameters mean value is in default modelIn enclosing.

S14: in the time that the difference of Diagnostic parameters value and Diagnostic parameters mean value is in preset range,Determine that corresponding measuring point is for normal;

S15: otherwise, determine that corresponding measuring point exists winding deformation.

In the time obtaining the Diagnostic parameters value of each measuring point, can calculate the mean value of these parameters,Be Diagnostic parameters mean value. When the difference of any one Diagnostic parameters value and Diagnostic parameters mean valueIn preset range time, this measuring point is normal, otherwise this measuring point exists winding deformation. ItsIn, preset range is ± 20%.

The method of the judgement winding deformation of power transformer that the present embodiment provides, passes through synchronous acquisitionThe vibration signal at each measuring point place of Winding in Power Transformer is consolidated with every rank of extracting in each vibration signalThere is single-frequency vibration attenuation curve corresponding to frequency to calculate the Diagnostic parameters value of each measuring point. Due to justUnder reason condition, Diagnostic parameters value is constant, or variation is very little, therefore when Diagnostic parameters valueWhen the difference of Diagnostic parameters mean value is in preset range, determine that corresponding measuring point is for normal;Otherwise, determine that corresponding measuring point exists winding deformation. This method and power transformer are without any electricityGas connects, and without transformer is carried out to power-off, very little to the influence on system operation of whole power system.In addition, this method, based on basket vibration mechanism of production, has reflected the frame for movement of winding better,Can be loosening to winding internal structure, the situation such as distortion detects.

Fig. 2 is the distribution schematic diagram of the each measuring point of Winding in Power Transformer provided by the invention. Wherein,In the time that Winding in Power Transformer is three phase windings, the number of measuring point is 6, and is uniformly distributed inThe tank surface of power transformer. Wherein, six measuring points respectively as the measuring point in Fig. 2 1., surveyPoint 2., measuring point 3., measuring point 4., measuring point 5. with measuring point 6..

Embodiment bis-

Fig. 3 is the structure of a kind of system that judges winding deformation of power transformer provided by the inventionFigure. As shown in Figure 3, judge the system of winding deformation of power transformer, comprising:

Collecting unit 10, under predetermined condition, synchronous acquisition Winding in Power Transformer eachThe vibration signal at measuring point place;

Extraction unit 11, for extracting the single-frequency corresponding to every rank intrinsic frequency of each vibration signalVibration attenuation curve; According to the each measuring point of single-frequency vibration attenuation curve calculation Winding in Power TransformerDiagnostic parameters value;

Judging unit 12, for the difference that judges Diagnostic parameters value and Diagnostic parameters mean value whetherIn preset range;

Determining unit 13, for the difference when Diagnostic parameters value and Diagnostic parameters mean value in advanceIf in scope time, determine that corresponding measuring point is for normal; Otherwise, determine corresponding measuring point exist aroundGroup distortion.

Wherein, predetermined condition is lower electric process or short-circuit impact.

Wherein, preset range is ± 20%.

Wherein, in the time that Winding in Power Transformer is three phase windings, the number of measuring point is 6, andBe uniformly distributed in the tank surface of power transformer.

Because embodiment bis-is embodiment of components of system as directed corresponding to method in embodiment mono-, because ofThis, concrete implementation process refers to the description of embodiment mono-, repeats no more here.

Wherein, collecting unit 10 involving vibrations sensors, the quantity of vibrating sensor and measuring pointQuantity identical.

In concrete enforcement, vibrating sensor can be arranged on to measuring point place, for gathering measuring pointVibration signal. The quantity of vibrating sensor is identical with the quantity of measuring point.

Wherein, also comprise: magnetic support, for vibrating sensor being fixed on to the oil of power transformerCase surface.

In order to fix vibrating sensor, can vibrating sensor be adsorbed by the magnetic force of magnetic supportIn the tank surface of power transformer.

Method and system to judgement winding deformation of power transformer provided by the present invention aboveBe described in detail. In description, each embodiment adopts the mode of going forward one by one to describe, Mei GeshiWhat execute that example stresses is all and the difference of other embodiment, identical between each embodimentSimilar part mutually referring to. For the disclosed device of embodiment, due to itself and enforcementThe disclosed method of example is corresponding, so description is fairly simple, relevant part is referring to method partIllustrate. It should be pointed out that for those skilled in the art, not de-Under the prerequisite of the principle of the invention, can also carry out some improvement and modification to the present invention, theseImprove and modify and also fall in the protection domain of the claims in the present invention.

Professional can also further recognize, describes in conjunction with embodiment disclosed hereinUnit and the algorithm steps of each example, can be with electronic hardware, computer software or the twoCombination realize, for the interchangeability of hardware and software is clearly described, in above-mentioned explanationIn composition and the step of each example have been described in general manner according to function. These functions actuallyCarry out with hardware or software mode, depend on application-specific and the design constraint of technical schemeCondition. Professional and technical personnel can realize institute with distinct methods to each specifically should being used forThe function of describing, but this realization should not thought and exceeds scope of the present invention.

The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directThe software module of carrying out with hardware, processor, or the combination of the two is implemented. Software moduleCan be placed in random access memory (RAM), internal memory, read-only storage (ROM), electrically programmableROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM,Or in the storage medium of interior known any other form of technical field.

Claims (10)

1. a method that judges winding deformation of power transformer, is characterized in that, comprising:
Under predetermined condition, the vibration at each measuring point place of Winding in Power Transformer described in synchronous acquisitionSignal;
Extract single-frequency vibration attenuation song corresponding to every rank intrinsic frequency in each described vibration signalLine;
According to the each measuring point of Winding in Power Transformer described in described single-frequency vibration attenuation curve calculationDiagnostic parameters value;
Judge that whether the difference of described Diagnostic parameters value and Diagnostic parameters mean value is in default modelIn enclosing;
When the difference of described Diagnostic parameters value and Diagnostic parameters mean value is in described preset rangeWhen interior, determine that corresponding measuring point is for normal; Otherwise, determine that corresponding measuring point exists winding deformation.
2. the method for judgement winding deformation of power transformer according to claim 1, itsBe characterised in that, described predetermined condition comprises: lower electric process or short-circuit impact.
3. the method for judgement winding deformation of power transformer according to claim 1, itsBe characterised in that, described preset range is ± 20%.
4. the method for judgement winding deformation of power transformer according to claim 1, itsBe characterised in that, in the time that described Winding in Power Transformer is three phase windings, the number of described measuring point is6, and be uniformly distributed in the tank surface of described power transformer.
5. a system that judges winding deformation of power transformer, is characterized in that, comprising:
Collecting unit, under predetermined condition, Winding in Power Transformer described in synchronous acquisitionThe vibration signal at each measuring point place;
Extraction unit, for extracting the list corresponding to every rank intrinsic frequency of each described vibration signalFrequency vibration attenuation curve; According to power transformer described in described single-frequency vibration attenuation curve calculation aroundOrganize the Diagnostic parameters value of each measuring point;
Judging unit, for the difference that judges described Diagnostic parameters value and Diagnostic parameters mean value isNo in preset range;
Determining unit, for the difference when described Diagnostic parameters value and Diagnostic parameters mean value inIn described preset range time, determine that corresponding measuring point is for normal; Otherwise, determine corresponding measuring pointThere is winding deformation.
6. the system of judgement winding deformation of power transformer according to claim 5, itsBe characterised in that, described predetermined condition is lower electric process or short-circuit impact.
7. the system of judgement winding deformation of power transformer according to claim 5, itsBe characterised in that, described preset range is ± 20%.
8. the system of judgement winding deformation of power transformer according to claim 5, itsBe characterised in that, in the time that described Winding in Power Transformer is three phase windings, the number of described measuring point is6, and be uniformly distributed in the tank surface of described power transformer.
9. the system of judgement winding deformation of power transformer according to claim 5, itsBe characterised in that, described collecting unit involving vibrations sensor, the quantity of described vibrating sensor withThe quantity of described measuring point is identical.
10. the system of judgement winding deformation of power transformer according to claim 9, itsBe characterised in that, also comprise: magnetic support, becomes for described vibrating sensor being fixed on to described electric powerThe tank surface of depressor.
CN201510960703.3A 2015-12-18 2015-12-18 Method and system for judging deformation of power transformer winding CN105606045A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN106815437A (en) * 2017-01-18 2017-06-09 广东电网有限责任公司电力科学研究院 Fuel tank vibration sensing area determination method and device under transformer steady state condition

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CN102998545A (en) * 2011-09-16 2013-03-27 河南电力试验研究院 Online transformer winding work state monitoring method
CN103968939A (en) * 2014-05-16 2014-08-06 国家电网公司 Transformer winding looseness fault detection method based on average displacement method
CN104034289A (en) * 2014-07-04 2014-09-10 国家电网公司 Condition monitoring method and device for windings of power transformer
CN104748838A (en) * 2015-03-27 2015-07-01 国家电网公司 Transformer winding loose determination system and method based on finite element analysis

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110037482A1 (en) * 2009-08-12 2011-02-17 Korea Electric Power Corporation Nondestructive inspection method of insulator using frequency resonance function
CN102998545A (en) * 2011-09-16 2013-03-27 河南电力试验研究院 Online transformer winding work state monitoring method
CN103968939A (en) * 2014-05-16 2014-08-06 国家电网公司 Transformer winding looseness fault detection method based on average displacement method
CN104034289A (en) * 2014-07-04 2014-09-10 国家电网公司 Condition monitoring method and device for windings of power transformer
CN104748838A (en) * 2015-03-27 2015-07-01 国家电网公司 Transformer winding loose determination system and method based on finite element analysis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106815437A (en) * 2017-01-18 2017-06-09 广东电网有限责任公司电力科学研究院 Fuel tank vibration sensing area determination method and device under transformer steady state condition
CN106815437B (en) * 2017-01-18 2020-03-10 广东电网有限责任公司电力科学研究院 Method and device for determining vibration sensitive area of oil tank under steady-state working condition of transformer

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Application publication date: 20160525