CN109945977A - A kind of dry-type transformer thermal fault detection method and system - Google Patents
A kind of dry-type transformer thermal fault detection method and system Download PDFInfo
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Abstract
The invention discloses a kind of dry-type transformer Heat Fault Diagnose method and system, this method comprises: the infrared image of acquisition dry-type transformer；Obtain the surface three dimension temperature map of dry-type transformer；Establish under normal running (operation) conditions and under the conditions of typical fault dry-type transformer surface three dimension thermo parameters method database；Dry-type transformer, which is calculated, using gray relative analysis method can open up the weight function of grey correlation analysis；Establish the failure matter-element model of dry-type transformer and the status matter-element model of dry-type transformer；The weight function that grey correlation analysis can be opened up using the dry-type transformer judges dry-type transformer with the presence or absence of typical fault, and typical fault then judges fault type if it exists；Show fault type and fault alarm information.Dry-type transformer thermal fault detection method and system provided by the invention based on infrared three dimensional temperature map and can open up gray relative analysis method progress dry-type transformer fever Representative Faults Diagnosis, improve efficiency of fault diagnosis and accuracy.
Description
Technical field
The present invention relates to electrical equipment fault detection technique fields, more particularly to a kind of dry-type transformer thermal fault detection
Method and system.
Background technique
Transformer is one of important equipment of electric system, plays particularly important effect in the power system.Wherein do
Formula transformer have the characteristics that it is fire retardant, safe, easy to maintain and small in size, in recent years in the fields such as the skyscraper in city and power station
It is acquired to be more and more widely used, it timely and accurately detects transformer early stage Hidden fault, is power system security, can
By the important leverage of power supply.The many typical faults of dry-type transformer can all be showed in the form of fever, therefore, pass through monitoring
It is particularly necessary that the profiling temperatures of dry-type transformer carry out fault diagnosis to transformer.
Accurate to obtain transformer temperature field not a duck soup, the thermocouple being widely used, fibre optical sensor thermometric can only be to changes
Several points of depressor measure, and can not obtain transformer temperature field distribution.Traditional transformer Infrared Fault Diagnosis technology is base
In the two-dimensional infrared image of infrared thermal imagery sensor shooting, in fact, infrared thermal imagery sensor is lost depth during being imaged
Spend information, two-dimensional infrared image be unable to characterize body surface geological information and, and three-dimensional space can be more intuitive, comprehensively
Reflect more information.Therefore, three-dimensionalreconstruction is carried out to infared spectrum based on transformer heat transfer theory, obtains dry-type transformer
Three dimensional temperature map, carrying out more accurate fault diagnosis to dry-type transformer has necessity.It is based on extendible set that theory, which can be opened up,
The Matter Analysis of conjunction can reasonably describe the variation of the internal structure and relationship and things to each other of things, carry out thing
The qualitative and quantitative comprehensive analysis of object.When application can open up theory and be analyzed, the determination of weight function generallys use empirical method,
There are some subjectivities when seeking weight, cannot objectively reflect actual conditions, influence each in dry-type transformer thermal fault detection
The accuracy of kind Representative Faults Diagnosis.
Summary of the invention
The object of the present invention is to provide a kind of dry-type transformer thermal fault detection method and system, are based on infrared three dimensional temperature
Map carries out dry-type transformer fever Representative Faults Diagnosis with that can open up gray relative analysis method, improves efficiency of fault diagnosis and standard
True property, and can accurate judgement fault type.
To achieve the above object, the present invention provides following schemes:
A kind of dry-type transformer Heat Fault Diagnose method, comprising the following steps:
S1 the infrared image of dry-type transformer) is acquired；
S2 three-dimensionalreconstruction) is carried out to infrared image according to dry-type transformer heat transfer theory, obtains the surface of dry-type transformer
Three dimensional temperature map；
S3) established under normal running (operation) conditions using numerical method and under the conditions of typical fault dry-type transformer surface three
Tie up thermo parameters method database；
S4 the surface three dimension thermo parameters method number) based on dry-type transformer under normal running (operation) conditions and under the conditions of typical fault
According to library, R-matrix is established respectively and compares sequence, and dry-type transformer is calculated using gray relative analysis method to open up ash
The weight function of color association analysis；
S5 the surface three dimension thermo parameters method database) based on dry-type transformer under the conditions of typical fault establishes dry type change
The failure matter-element model of depressor；Surface three dimension temperature map based on dry-type transformer, establishes the status matter-element of dry-type transformer
Model；The weight function that grey correlation analysis can be opened up using the dry-type transformer, using gray relative analysis method can be opened up by status
Matter-element model is compared and analyzed with failure matter-element model, judges that dry-type transformer whether there is typical fault, typical if it exists
Failure then judges fault type；
S6 it) shows the surface three dimension temperature map of dry-type transformer, and shows fault type and fault alarm information.
Optionally, the infrared image of the acquisition dry-type transformer, specifically includes: setting apart from four angles of dry-type transformer
Four infrared thermal imagery sensors, four infrared thermal imagery sensor sync pulse jamming dry-type transformers are respectively set on the position of set a distance
Infrared image.
Optionally, described that three-dimensionalreconstruction is carried out to infrared image according to dry-type transformer heat transfer theory, obtain dry type transformation
The surface three dimension temperature map of device, specifically includes:
S201 it) is based on heat-conduction principle, high pressure is calculated according to collected dry-type transformer high-voltage winding hull-skin temperature
Winding internal surface temperature distributed data；
S202 it) is based on heat radiation principle, low pressure winding surface temperature is calculated by high-voltage winding internal surface temperature distributed data
Distributed data；
S203 it) is based on heat transfer and heat radiation principle, by collected dry-type transformer part iron core and low pressure winding table
The surface temperature distribution data of face temperature profile data calculating iron core；
S204 the three dimensional temperature of dry-type transformer) is formed according to the surface temperature distribution data of high and low pressure winding and iron core
Map.
Optionally, described to be established under normal running (operation) conditions using numerical method and dry-type transformer under the conditions of typical fault
Surface three dimension thermo parameters method database, specifically include:
The limited element calculation model for establishing dry-type transformer three-dimensional temperature field, to transformer in varying environment temperature, load
The temperature field of normal operation and typical fault situation under the conditions of rate, blower start-stop is respectively calculated, and obtains dry-type transformer
Surface three dimension thermo parameters method is established under normal running (operation) conditions as a result, according to calculated result and dry type becomes under the conditions of typical fault
The surface three dimension thermo parameters method database of depressor.
Optionally, the surface three dimension temperature based on dry-type transformer under normal running (operation) conditions and under the conditions of typical fault
Field distribution database establishes R-matrix respectively and compares sequence, and dry type transformation is calculated using gray relative analysis method
Device can open up the weight function of grey correlation analysis, specifically include:
S401 it) is established according to the surface three dimension thermo parameters method data of dry-type transformer under normal running (operation) conditions in database
R-matrix V0；
S402 it) is formed according to the surface three dimension thermo parameters method data of dry-type transformer under the conditions of typical fault in database
Compare sequence V1,V2,L,Vj；
S403 the difference sequence of each point) is sought:
Δj(k)=| vj(k)-v0(k) |,
Δj=(Δj(1),Δj(2),L,Δj(t))；
S404 the maximum difference and lowest difference at the two poles of the earth) are asked:
S405) calculate correlation coefficient:
ξ is resolution ratio, takes ξ=0.5；
S406) calculating correlation:
S407 weight function) is calculated:
Optionally, the surface three dimension thermo parameters method database based on dry-type transformer under the conditions of typical fault, builds
The failure matter-element model of vertical dry-type transformer；Surface three dimension temperature map based on dry-type transformer, establishes dry-type transformer
Status matter-element model；The weight function that grey correlation analysis can be opened up using the dry-type transformer, using grey correlation analysis can be opened up
Method compares and analyzes status matter-element model and failure matter-element model, judges that dry-type transformer whether there is typical fault, if
There are typical faults then to judge fault type, specifically includes:
S501) according to the surface three dimension thermo parameters method data of dry-type transformer under the conditions of typical fault, dry type change is established
The failure metaset of depressor typical fault: I={ I1,I2,I3,···,Ii, if I1,I2,I3,···,IiFor dry-type transformer
Issuable fault type, and establish corresponding characteristic set C={ C1,C2,C3,···,Cn, each feature difference
It is corresponding with the coordinate information on the dry-type transformer surface, the value range of each characteristic value by dry-type transformer surface temperature
Field distribution database is spent to determine；
S502 the matter-element model of dry-type transformer typical fault type) is established, the I if dry-type transformer breaks downi, then phase
The failure matter-element model answered are as follows:
S503 the status matter-element model of description dry-type transformer status) is established:
S504 the incidence matrix of dry-type transformer, the correlation function of the dry-type transformer) are calculated are as follows:
Wherein: i=1,2,3, n；J=1,2,3, n；
S505 the weight function W of grey correlation analysis) can be opened up using the dry-type transformerj, divided using grey correlation can be opened up
Analysis method compares and analyzes status matter-element model and failure matter-element model, and calculating dry-type transformer is associated with each fault type
Degree:
S506) correlation degree is standardized:
In formula:
S507 dry-type transformer) is judged with the presence or absence of typical fault, and typical fault then judges fault type if it exists:
If correlation degree λ (Ii)≤0, i=1,2,3, n, then illustrating the dry-type transformer, there is no typical events
Barrier；If λ (Ii) > 0, i=1,2,3, n, then illustrating the dry-type transformer, there are typical faults, are greater than to correlation degree
0 sort from large to small, according to maximum likelihood principle, judges that the failure of dry-type transformer appearance belongs to degree of association maximum value
Corresponding fault type；
If two class fault correlation degree occur closely and being much larger than other correlation degree values, it may determine that this is dry
There is the two classes failure simultaneously in formula transformer.
The present invention also provides a kind of dry-type transformer Heat Fault Diagnose systems, are applied to above-mentioned dry-type transformer and generate heat
Method for diagnosing faults, the system comprises:
Infrared image acquisition unit, for acquiring the infrared image of dry-type transformer；
Three-dimensionalreconstruction unit is done for carrying out three-dimensionalreconstruction to infrared image according to dry-type transformer heat transfer theory
The surface three dimension temperature map of formula transformer；
Distribution of three-dimensional temperature Database unit, for using numerical method to establish under normal running (operation) conditions and allusion quotation
The surface three dimension thermo parameters method database of dry-type transformer under type fault condition；
The weight function computing unit of grey correlation analysis can be opened up, for based under normal running (operation) conditions and typical fault condition
The surface three dimension thermo parameters method data of lower dry-type transformer are established R-matrix respectively and compare sequence, and closed using grey
Dry-type transformer, which is calculated, in connection analytic approach can open up the weight function of grey correlation analysis；
Failure diagnosis unit, for the surface three dimension thermo parameters method data based on dry-type transformer under the conditions of typical fault
The failure matter-element model of dry-type transformer is established in library；Surface three dimension temperature map based on dry-type transformer, establishes dry type transformation
The status matter-element model of device；The weight function that grey correlation analysis can be opened up using the dry-type transformer, using grey correlation can be opened up
Analytic approach compares and analyzes status matter-element model and failure matter-element model, judges dry-type transformer with the presence or absence of typical event
Barrier, typical fault then judges fault type if it exists；
Status display unit for showing the surface three dimension temperature map of dry-type transformer, and shows fault type and event
Hinder warning message.
Optionally, the failure diagnosis unit, specifically includes:
Matter-element model establishes module, for the surface three dimension thermo parameters method based on dry-type transformer under the conditions of typical fault
Database establishes the failure matter-element model of dry-type transformer, and the surface three dimension temperature map based on dry-type transformer establishes dry type
The status matter-element model of transformer；
Fault correlation degree computing module, the weight function of grey correlation analysis can be opened up using the dry-type transformer, using can
It opens up gray relative analysis method to compare and analyze status matter-element model and failure matter-element model, calculates dry-type transformer and each event
Hinder the correlation degree of type；
Breakdown judge module judges dry-type transformer with the presence or absence of typical fault, if it exists typical event according to correlation degree
Barrier then judges fault type.
Optionally, the infrared image acquisition unit, specifically includes: four infrared thermal imagery sensors, described four infrared
The position apart from four angle set distances of dry-type transformer, four infrared thermal imagery sensor sync pulse jammings are arranged in thermal imagery sensor
The infrared image of dry-type transformer.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: dry type provided by the invention
Transformer thermal fault detection method and system acquire the infrared image of dry-type transformer by infrared thermal imagery sensor in real time, and
Infrared three dimensional temperature map is established, provides basis to establish the status matter-element model of dry-type transformer；Based on normal running (operation) conditions
The surface three dimension thermo parameters method database of dry-type transformer, establishes R-matrix respectively and compares under the conditions of lower and typical fault
Sequence, and use gray relative analysis method is calculated dry-type transformer and can open up the weight function of grey correlation analysis, avoids root
The subjectivity problem that weight function is determined according to empirical method, improves the accuracy of weight function；Calculated weight function and can
The correlation degree that gray relative analysis method calculates dry-type transformer and each fault type is opened up, provides reliable basis for fault diagnosis,
Efficiency of fault diagnosis and accuracy are improved, and can accurate judgement fault type.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart of dry-type transformer thermal fault detection method in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of dry-type transformer thermal fault detection system in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of dry-type transformer thermal fault detection method and system, are based on infrared three dimensional temperature
Map carries out dry-type transformer fever Representative Faults Diagnosis with that can open up gray relative analysis method, improves efficiency of fault diagnosis and standard
True property, and can accurate judgement fault type.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the flow chart of dry-type transformer thermal fault detection method in the embodiment of the present invention, as shown in Figure 1, of the invention
The dry-type transformer thermal fault detection method of offer, comprising the following steps:
S1 the infrared image of dry-type transformer) is acquired；
S2 three-dimensionalreconstruction) is carried out to infrared image according to dry-type transformer heat transfer theory, obtains the surface of dry-type transformer
Three dimensional temperature map；
S3) established under normal running (operation) conditions using numerical method and under the conditions of typical fault dry-type transformer surface three
Tie up thermo parameters method database；
S4 the surface three dimension thermo parameters method number) based on dry-type transformer under normal running (operation) conditions and under the conditions of typical fault
According to library, R-matrix is established respectively and compares sequence, and dry-type transformer is calculated using gray relative analysis method to open up ash
The weight function of color association analysis；
S5 the surface three dimension thermo parameters method database) based on dry-type transformer under the conditions of typical fault establishes dry type change
The failure matter-element model of depressor；Surface three dimension temperature map based on dry-type transformer, establishes the status matter-element of dry-type transformer
Model；The weight function that grey correlation analysis can be opened up using the dry-type transformer, using gray relative analysis method can be opened up by status
Matter-element model is compared and analyzed with failure matter-element model, judges that dry-type transformer whether there is typical fault, typical if it exists
Failure then judges fault type；
S6 it) shows the surface three dimension temperature map of dry-type transformer, and shows fault type and fault alarm information.
In step sl, the infrared image of the acquisition dry-type transformer, specifically includes: apart from dry-type transformer four
Four infrared thermal imagery sensors are respectively set on the position of angle set distance, four infrared thermal imagery sensor sync pulse jamming dry types become
The infrared image of depressor.Infrared thermal imagery sensor and transformer keep set distance, and the basis of design of the set distance is to guarantee
The image taken completely includes the profile of dry-type transformer, and suitable ratio is presented in the picture.Infrared heat sensing
Device acquires the infrared image of dry-type transformer to be diagnosed in real time.
In step s 2, described that three-dimensionalreconstruction is carried out to infrared image according to dry-type transformer heat transfer theory, obtain dry type
The surface three dimension temperature map of transformer, specifically includes:
S201 it) is based on heat-conduction principle, high pressure is calculated according to collected dry-type transformer high-voltage winding hull-skin temperature
Winding internal surface temperature distributed data；
S202 it) is based on heat radiation principle, low pressure winding surface temperature is calculated by high-voltage winding internal surface temperature distributed data
Distributed data；
S203 it) is based on heat transfer and heat radiation principle, by collected dry-type transformer part iron core and low pressure winding table
The surface temperature distribution data of face temperature profile data calculating iron core；
S204 the three dimensional temperature of dry-type transformer) is formed according to the surface temperature distribution data of high and low pressure winding and iron core
Map.
In step s3, the use numerical method is established under normal running (operation) conditions and dry type becomes under the conditions of typical fault
The surface three dimension thermo parameters method database of depressor, specifically includes:
The limited element calculation model for establishing dry-type transformer three-dimensional temperature field, to transformer in varying environment temperature, load
The temperature field of normal operation and typical fault situation under the conditions of rate, blower start-stop is respectively calculated, and obtains dry-type transformer
Surface three dimension thermo parameters method is established under normal running (operation) conditions as a result, according to calculated result and dry type becomes under the conditions of typical fault
The surface three dimension thermo parameters method database of depressor.
In step s 4, the surface three dimension based on dry-type transformer under normal running (operation) conditions and under the conditions of typical fault
Thermo parameters method database establishes R-matrix respectively and compares sequence, and dry type is calculated using gray relative analysis method
Transformer can open up the weight function of grey correlation analysis, specifically include:
S401 it) is established according to the surface three dimension thermo parameters method data of dry-type transformer under normal running (operation) conditions in database
R-matrix V0；
S402 it) is formed according to the surface three dimension thermo parameters method data of dry-type transformer under the conditions of typical fault in database
Compare sequence V1,V2,L,Vj；Typical fault mainly includes core multi-point ground fault, transformer winding short trouble, becomes herein
Depressor fan trouble, transformer core partial short-circuit failure；Then corresponding dry-type transformer different faults underlaying surface temperature field point
Sequence V is compared in cloth formation1,V2,V3,V4；
S403 the difference sequence of each point) is sought:
Δj(k)=| vj(k)-v0(k) |,
Δj=(Δj(1),Δj(2),L,Δj(t))；J=1,2,3,4；
S404 the maximum difference and lowest difference at the two poles of the earth) are asked:
S405) calculate correlation coefficient:
ξ is resolution ratio, takes ξ=0.5；
S406) calculating correlation:
S407 weight function) is calculated:
In step s 5, the surface three dimension thermo parameters method data based on dry-type transformer under the conditions of typical fault
The failure matter-element model of dry-type transformer is established in library；Surface three dimension temperature map based on dry-type transformer, establishes dry type transformation
The status matter-element model of device；The weight function that grey correlation analysis can be opened up using the dry-type transformer, using grey correlation can be opened up
Analytic approach compares and analyzes status matter-element model and failure matter-element model, judges dry-type transformer with the presence or absence of typical event
Barrier, typical fault then judges fault type if it exists, specifically includes:
S501) according to the surface three dimension thermo parameters method data of dry-type transformer under the conditions of typical fault, dry type change is established
The failure metaset of depressor typical fault: I={ I1,I2,I3,···,Ii, if I1,I2,I3,···,IiFor dry-type transformer
Issuable fault type, and establish corresponding characteristic set C={ C1,C2,C3,···,Cn, each feature difference
It is corresponding with the coordinate information on taken dry-type transformer surface, the value range of each characteristic value by dry-type transformer surface temperature
Field distribution database is spent to determine；If four kinds as follows of the typical fault in the issuable heating accident of dry-type transformer:
I1--- core multi-point ground fault
I2--- transformer winding short trouble
I3--- transformer blower fan failure
I4--- transformer core partial short-circuit failure；Then corresponding dry-type transformer different faults underlaying surface temperature field point
Sequence V is compared in cloth formation1,V2,V3,V4；
S502 the matter-element model of dry-type transformer typical fault type) is established, the I if dry-type transformer breaks downi, then phase
The failure matter-element model answered are as follows:
S503 the status matter-element model of description dry-type transformer status) is established:
S504 the incidence matrix of dry-type transformer, the correlation function of the dry-type transformer) are calculated are as follows:
Wherein: i=1,2,3,4；J=1,2,3,4；
S505 the weight function W of grey correlation analysis) can be opened up using the dry-type transformerj, divided using grey correlation can be opened up
Analysis method compares and analyzes status matter-element model and failure matter-element model, and calculating dry-type transformer is associated with each fault type
Degree:
S506) correlation degree is standardized:
In formula:
S507 dry-type transformer) is judged with the presence or absence of typical fault, and typical fault then judges fault type if it exists:
If correlation degree λ (Ii)≤0, i=1,2,3,4, then illustrating the dry-type transformer, there is no typical faults；If λ (Ii)
> 0, i=1,2,3,4, then illustrate the dry-type transformer there are typical fault, to correlation degree sorting from large to small greater than 0,
According to maximum likelihood principle, the failure for judging that the dry-type transformer occurs belongs to the corresponding fault type of degree of association maximum value；
If two class fault correlation degree occur closely and being much larger than other correlation degree values, it may determine that this is dry
There is the two classes failure simultaneously in formula transformer.
I involved in the embodiment of the present application, j, k, t are the natural number of 1,2,3 ..., n.
The present invention also provides a kind of dry-type transformer Heat Fault Diagnose systems, are applied to above-mentioned dry-type transformer and generate heat
Method for diagnosing faults, the system comprises:
Infrared image acquisition unit, for acquiring the infrared image of dry-type transformer；
Three-dimensionalreconstruction unit is done for carrying out three-dimensionalreconstruction to infrared image according to dry-type transformer heat transfer theory
The surface three dimension temperature map of formula transformer；
Distribution of three-dimensional temperature Database unit, for using numerical method to establish under normal running (operation) conditions and allusion quotation
The surface three dimension thermo parameters method database of dry-type transformer under type fault condition；
The weight function computing unit of grey correlation analysis can be opened up, for based under normal running (operation) conditions and typical fault condition
The surface three dimension thermo parameters method data of lower dry-type transformer are established R-matrix respectively and compare sequence, and closed using grey
Dry-type transformer, which is calculated, in connection analytic approach can open up the weight function of grey correlation analysis；
Failure diagnosis unit, for the surface three dimension thermo parameters method data based on dry-type transformer under the conditions of typical fault
The failure matter-element model of dry-type transformer is established in library；Surface three dimension temperature map based on dry-type transformer, establishes dry type transformation
The status matter-element model of device；The weight function that grey correlation analysis can be opened up using the dry-type transformer, using grey correlation can be opened up
Analytic approach compares and analyzes status matter-element model and failure matter-element model, judges dry-type transformer with the presence or absence of typical event
Barrier, typical fault then judges fault type if it exists；
Status display unit for showing the surface three dimension temperature map of dry-type transformer, and shows fault type and event
Hinder warning message.
The failure diagnosis unit, specifically includes:
Matter-element model establishes module, for the surface three dimension thermo parameters method based on dry-type transformer under the conditions of typical fault
Database establishes the failure matter-element model of dry-type transformer, and the surface three dimension temperature map based on dry-type transformer establishes dry type
The status matter-element model of transformer；
Fault correlation degree computing module, the weight function of grey correlation analysis can be opened up using the dry-type transformer, using can
It opens up gray relative analysis method to compare and analyze status matter-element model and failure matter-element model, calculates dry-type transformer and each event
Hinder the correlation degree of type；
Breakdown judge module judges dry-type transformer with the presence or absence of typical fault, if it exists typical event according to correlation degree
Barrier then judges fault type.
The infrared image acquisition unit, specifically includes: four infrared thermal imagery sensors, four infrared thermal imageries sensing
The position apart from four angle set distances of dry-type transformer, four infrared thermal imagery sensor sync pulse jamming dry type transformations are arranged in device
The infrared image of device.
Dry-type transformer thermal fault detection method and system provided by the invention, are acquired in real time by infrared thermal imagery sensor
The infrared image of dry-type transformer, and infrared three dimensional temperature map is established, it is mentioned to establish the status matter-element model of dry-type transformer
For basis；Surface three dimension thermo parameters method data based on dry-type transformer under normal running (operation) conditions and under the conditions of typical fault
Library establishes R-matrix respectively and compares sequence, and dry-type transformer is calculated using gray relative analysis method to open up grey
The weight function of association analysis avoids the subjectivity problem that empirical method determines weight function；Calculated weight function and can
The correlation degree that gray relative analysis method calculates dry-type transformer and each fault type is opened up, provides reliable basis for fault diagnosis,
Efficiency of fault diagnosis and accuracy are improved, and can accurate judgement fault type.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (9)
1. a kind of dry-type transformer Heat Fault Diagnose method, which comprises the following steps:
S1 the infrared image of dry-type transformer) is acquired；
S2 three-dimensionalreconstruction) is carried out to infrared image according to dry-type transformer heat transfer theory, obtains the surface three dimension of dry-type transformer
Temperature map；
S3) established under normal running (operation) conditions using numerical method and under the conditions of typical fault dry-type transformer surface three dimension temperature
Spend field distribution database；
S4 the surface three dimension thermo parameters method data) based on dry-type transformer under normal running (operation) conditions and under the conditions of typical fault
Library establishes R-matrix respectively and compares sequence, and dry-type transformer is calculated using gray relative analysis method to open up grey
The weight function of association analysis；
S5 the surface three dimension thermo parameters method database) based on dry-type transformer under the conditions of typical fault, establishes dry-type transformer
Failure matter-element model；Surface three dimension temperature map based on dry-type transformer, establishes the status matter-element model of dry-type transformer；
The weight function that grey correlation analysis can be opened up using the dry-type transformer, using gray relative analysis method can be opened up by status matter-element mould
Type is compared and analyzed with failure matter-element model, judges dry-type transformer with the presence or absence of typical fault, typical fault is then if it exists
Judge fault type；
S6 it) shows the surface three dimension temperature map of dry-type transformer, and shows fault type and fault alarm information.
2. dry-type transformer Heat Fault Diagnose method according to claim 1, which is characterized in that the acquisition dry type becomes
The infrared image of depressor, specifically includes: be respectively set on the position apart from four angle set distances of dry-type transformer four it is red
Outer thermal imagery sensor, the infrared image of four infrared thermal imagery sensor sync pulse jamming dry-type transformers.
3. dry-type transformer Heat Fault Diagnose method according to claim 1, which is characterized in that described to be become according to dry type
Depressor heat transfer theory carries out three-dimensionalreconstruction to infrared image, obtains the surface three dimension temperature map of dry-type transformer, specifically includes:
S201 it) is based on heat-conduction principle, high-voltage winding is calculated according to collected dry-type transformer high-voltage winding hull-skin temperature
Internal surface temperature distributed data；
S202 it) is based on heat radiation principle, low pressure winding surface temperature distribution is calculated by high-voltage winding internal surface temperature distributed data
Data；
S203 it) is based on heat transfer and heat radiation principle, by collected dry-type transformer part iron core and low pressure winding surface temperature
Spend the surface temperature distribution data that distributed data calculates iron core；
S204 the three dimensional temperature map of dry-type transformer) is formed according to the surface temperature distribution data of high and low pressure winding and iron core.
4. dry-type transformer Heat Fault Diagnose method according to claim 1, which is characterized in that described to use numerical value meter
Algorithm establish under normal running (operation) conditions and under the conditions of typical fault dry-type transformer surface three dimension thermo parameters method database, tool
Body includes:
The limited element calculation model for establishing dry-type transformer three-dimensional temperature field, to transformer in varying environment temperature, load factor, wind
The temperature field of normal operation and typical fault situation under the conditions of machine start-stop is respectively calculated, and obtains dry-type transformer surface three
Thermo parameters method is tieed up as a result, according to calculated result, is established under normal running (operation) conditions and dry-type transformer under the conditions of typical fault
Surface three dimension thermo parameters method database.
5. dry-type transformer Heat Fault Diagnose method according to claim 1, which is characterized in that described based on normal fortune
The surface three dimension thermo parameters method database of dry-type transformer, establishes R-matrix respectively under the conditions of row and under the conditions of typical fault
With compare sequence, and dry-type transformer is calculated using gray relative analysis method can open up the weight function of grey correlation analysis, have
Body includes:
S401) reference is established according to the surface three dimension thermo parameters method data of dry-type transformer under normal running (operation) conditions in database
Matrix V0；
S402) compared according to the surface three dimension thermo parameters method data formation of dry-type transformer under the conditions of typical fault in database
Sequence V1,V2,L,Vj；
S403 the difference sequence of each point) is sought:
Δj(k)=| vj(k)-v0(k) |,
Δj=(Δj(1),Δj(2),L,Δj(t))；
S404 the maximum difference and lowest difference at the two poles of the earth) are asked:
S405) calculate correlation coefficient:
ξ is resolution ratio, takes ξ=0.5；
S406) calculating correlation:
S407 weight function) is calculated:
6. dry-type transformer Heat Fault Diagnose method according to claim 5, which is characterized in that described based on typical event
The surface three dimension thermo parameters method database of dry-type transformer, establishes the failure matter-element model of dry-type transformer under the conditions of barrier；Base
In the surface three dimension temperature map of dry-type transformer, the status matter-element model of dry-type transformer is established；Using the dry type transformation
Device can open up the weight function of grey correlation analysis, using can open up gray relative analysis method for status matter-element model and failure matter-element model
It compares and analyzes, judges dry-type transformer with the presence or absence of typical fault, typical fault then judges fault type if it exists, specifically
Include:
S501) according to the surface three dimension thermo parameters method data of dry-type transformer under the conditions of typical fault, dry-type transformer is established
The failure metaset of typical fault: I={ I1,I2,I3,…,Ii, if I1,I2,I3,···,IiFor dry-type transformer there may be
Multiple fault types, and establish corresponding characteristic set C={ C1,C2,C3,…,Cn, each feature is done with described respectively
The coordinate information on formula transformer surface is corresponding, the value range of each characteristic value by dry-type transformer surface temperature field distribution
Database determines；
S502 the matter-element model of dry-type transformer typical fault type) is established, the I if dry-type transformer breaks downi, then accordingly
Failure matter-element model are as follows:
S503 the status matter-element model of description dry-type transformer status) is established:
S504 the incidence matrix of dry-type transformer, the correlation function of the dry-type transformer) are calculated are as follows:
Wherein: i=1,2,3 ..., n；J=1,2,3 ..., n；
S505 the weight function W of grey correlation analysis) can be opened up using the dry-type transformerj, will using gray relative analysis method can be opened up
Status matter-element model is compared and analyzed with failure matter-element model, calculates the correlation degree of dry-type transformer and each fault type:
S506) correlation degree is standardized:
In formula:
S507 dry-type transformer) is judged with the presence or absence of typical fault, and typical fault then judges fault type if it exists:
If correlation degree λ (Ii)≤0, i=1,2,3 ..., n, then illustrating the dry-type transformer, there is no typical faults；If λ (Ii)
> 0, i=1,2,3, n, then illustrate the dry-type transformer there are typical fault, to correlation degree greater than 0 from greatly to
Small sequence judges that the failure that the dry-type transformer occurs belongs to the corresponding event of degree of association maximum value according to maximum likelihood principle
Hinder type；
If two class fault correlation degree occur closely and being much larger than other correlation degree values, it may determine that the dry type becomes
There is the two classes failure simultaneously in depressor.
7. a kind of dry-type transformer Heat Fault Diagnose system, which is characterized in that the system comprises:
Infrared image acquisition unit, for acquiring the infrared image of dry-type transformer；
Three-dimensionalreconstruction unit obtains dry type and becomes for carrying out three-dimensionalreconstruction to infrared image according to dry-type transformer heat transfer theory
The surface three dimension temperature map of depressor；
Distribution of three-dimensional temperature Database unit, for using numerical method to establish under normal running (operation) conditions and typical event
The surface three dimension thermo parameters method database of dry-type transformer under the conditions of barrier；
The weight function computing unit of grey correlation analysis can be opened up, is done under normal running (operation) conditions and under the conditions of typical fault for being based on
The surface three dimension thermo parameters method data of formula transformer establish R-matrix respectively and compare sequence, and using grey correlation point
Dry-type transformer, which is calculated, in analysis method can open up the weight function of grey correlation analysis；
Failure diagnosis unit, for the surface three dimension thermo parameters method database based on dry-type transformer under the conditions of typical fault,
Establish the failure matter-element model of dry-type transformer；Surface three dimension temperature map based on dry-type transformer, establishes dry-type transformer
Status matter-element model；The weight function that grey correlation analysis can be opened up using the dry-type transformer is divided using that can open up grey correlation
Analysis method compares and analyzes status matter-element model and failure matter-element model, judges that dry-type transformer whether there is typical fault,
Typical fault then judges fault type if it exists；
Status display unit for showing the surface three dimension temperature map of dry-type transformer, and shows fault type and failure report
Alert information.
8. dry-type transformer Heat Fault Diagnose system according to claim 7, which is characterized in that the fault diagnosis list
Member specifically includes:
Matter-element model establishes module, for the surface three dimension thermo parameters method data based on dry-type transformer under the conditions of typical fault
The failure matter-element model of dry-type transformer is established in library, and the surface three dimension temperature map based on dry-type transformer establishes dry type transformation
The status matter-element model of device；
Fault correlation degree computing module, the weight function of grey correlation analysis can be opened up using the dry-type transformer, using can open up ash
Color correlation fractal dimension compares and analyzes status matter-element model and failure matter-element model, calculates dry-type transformer and each failure classes
The correlation degree of type；
Breakdown judge module judges dry-type transformer with the presence or absence of typical fault, typical fault is then if it exists according to correlation degree
Judge fault type.
9. dry-type transformer Heat Fault Diagnose system according to claim 7, which is characterized in that the infrared image is adopted
Collect unit, specifically include: four infrared thermal imagery sensors, four infrared thermal imagery sensors are arranged apart from dry-type transformer
The position of four angle set distances, the infrared image of four infrared thermal imagery sensor sync pulse jamming dry-type transformers.
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