CN110440852A - Oil-immersed transformer lifetime estimation method and assessment device - Google Patents
Oil-immersed transformer lifetime estimation method and assessment device Download PDFInfo
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention relates to transformer control technical fields, and in particular to a kind of oil-immersed transformer lifetime estimation method, top-oil temperature θ of this method according to oil-immersed transformer 1o, oil-immersed transformer 1 load current I0, and temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under the rated current that is directly obtained according to the temperature rise test and recommendation of oil-immersed transformer 1hr, thermal model constant k21And k22, winding timeconstantτW, oil temperature timeconstantτO, rated current Ir and around class index y, life appraisal is carried out to oil-immersed transformer, can accurate evaluation oil-immersed transformer remaining life, extend the Years Of Service of oil-immersed transformer to greatest extent, reduce power grid maintenance cost；Further relate to a kind of oil-immersed transformer life appraisal device using this method and a kind of oil-immersed transformer life appraisal device based on cloud platform, the remaining life of the two energy accurate evaluation oil-immersed transformer.
Description
Technical field
The present invention relates to transformer control technical fields, and in particular to a kind of oil-immersed transformer lifetime estimation method, one
Kind is using the oil-immersed transformer assessment device of this method and a kind of oil immersed type transformation based on cloud platform using this method
Device life appraisal device.
Background technique
With the development of the social economy, China is for the quality of electric power energy, more stringent requirements are proposed, and substation makees
For the core and hinge of energy source in power grid, it is necessary to ensure that it continues, stable and reliable operation is to prevent power grid generation weight
Major break down.For numerous power transmission and transforming equipments, the failure rate of transformer occupies significant proportion in operation troubles, that is to say, that
Transformer safety reliably run be substation's normal table operation basis.Early stage installs the Aging Problem of transformer simultaneously
Increasingly prominent, thus the aging of a large amount of transformers of bring and deterioration failure are one of main problem of transformer.To ensure electricity
The stability of net, transformer needs to be replaced before the deterioration to a certain extent of its state, and transformer itself has throwing
The feature costly, acquisition lead time is grown is provided, is just needed when being related to the replacement of a large amount of transformer equipments to transformer in this way
Service life assessed, and the replacement of transformer, and these transformers are determined with life appraisal according to the behaviour in service of transformer
Replacement decision mainly realized by on-line monitoring and service life evaluation system.Therefore the on-line checking for transformer and service life
Assessment is power transmission and transforming equipment operation management and diagnostic system important research direction.Existing a large amount of transformers have been closed on or have been run
Terminal to projected life needs replacing, but part of transformer is reasonable due to safeguarding, remains to continue to run a period of time,
In order to avoid blindness replacement causes economic loss, or security risk is caused without foundation operation, it is necessary to the remaining longevity of transformer
Life is assessed, and realizes that transformer runs to maximum service life (MSL) under safety condition.
Existing technology focuses primarily upon the status monitoring of transformer, and the state of transformer is collected by condition monitoring system
Information is measured, realizes on line real-time monitoring, by assessing transformer state deterioration process mechanism, the healthy shape of quantitatively evaluating transformer
State.By health status in conjunction with transformer failure consequence severity together determine transformer failure risk and to them
Carry out failure risk sequence, based on this, for transformer maintenance, overhaul or replaced decision is provided, have in resource
The higher ranked equipment of priority processing failure risk in the case where limit.China is evaluated by the operating status to transformer,
Condition Maintenance Method of Transformer and risk assessment strategies are formulated with this, by monitoring and analyzing transformer state in real time with risk as guiding
To instruct Condition Maintenance Method of Transformer to work.
Domestic existing Transformer Condition Monitoring System focuses primarily upon the short-term operation condition monitoring of transformer, for becoming
The medium-term and long-term life appraisal of depressor is not perfect with diagnostic system.Existing Transformer Condition Monitoring System is mostly to ensure that power grid can
It is primary Consideration by property, no matter as long as its status of the longer transformer of some active times reaches the fortune of conservative estimation
The row time limit is replaced, and is not analyzed transformer state in this way, is not studied transformer failure regularity, and applies specified one knife of the time limit
The transformer substitute mode cut is neither economic nor scientific.
The present invention monitors transformer on-line, diagnostic system is assessed and life appraisal.By to transformer state
Monitoring and service life and overload assessment can effectively understand the operation conditions of transformer, assess overload state and transformer
Aging and service life, avoid because transformer aging, cracking failure occur burst accident, guarantee the economic benefit of equipment.It is logical
Diagnostic system is crossed, the operating status of analysis and assessment transformer counts the Lifetime Distribution Model of transformer, provides decision and rule
It draws, improves the service life and economic benefit of transformer.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, provide a kind of oil-immersed transformer lifetime estimation method,
A kind of oil-immersed transformer assessment device using this method and a kind of oil immersed type change based on cloud platform using this method
Depressor life appraisal device.
To achieve the above object, present invention employs following technical solutions:
A kind of oil-immersed transformer lifetime estimation method comprising following steps:
Step 1 at least obtains the following data of oil-immersed transformer 1: the top-oil temperature θ of oil-immersed transformer 1o, oil immersion
The load current I0 of formula transformer 1, and directly obtained according to the temperature rise test and recommendation of oil-immersed transformer 1 specified
Temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under electric currenthr, thermal model constant k21And k22, winding timeconstantτW, oil temperature
TimeconstantτO, rated current Ir and around class index y；
Step 2 carries out life appraisal, life appraisal to oil-immersed transformer 1 according to data acquired in step 1
Specific step is as follows:
Initial temperature rise of hot spot first item:
Δθh1(0)=k21×ΔθhrKy；
Initial temperature rise of hot spot Section 2:
Δθh2(0)=(k21-1)×ΔθhrKy；
Step 2 A calculates the hot spot temperature of winding that n-th of sampling period is t according to the difference equation formula of temperature rise of hot spot
θh(n), n be integer and n >=1,
The temperature rise of hot spot first item in n-th of sampling period:
Δθh1(n)=Δ θh1(n-1)+DΔθh1(n),
Wherein,
The temperature rise of hot spot Section 2 in n-th of sampling period:
Δθh2(n)=Δ θh2(n-1)+DΔθh2(n),
Wherein,
At the end of n-th of sampling period, temperature rise of the hot spot temperature of winding to top-oil temperature:
Δθh(n)=Δ θh1(n)-Δθh2(n)；
At the end of n-th of sampling period, hot spot temperature of winding:
θh(n)=θo+Δθh(n)；
Wherein, K is load factor, K=load current I0/ rated current Ir；
Step 2 B calculates the remaining longevity of oil-immersed transformer according to the hot spot temperature of winding being calculated in step 2 A
Life, specific calculating process are as follows:
At the end of n-th of sampling period, the opposite ageing rate V in the sampling periodnCalculation formula are as follows:
According to the opposite ageing rate V in the sampling periodnOil-immersed transformer 1 is calculated in the life loss L in the sampling periodn,
Calculation formula are as follows:
The remaining life T of oil-immersed transformer (1) is calculated according to life lossIt is remaining, calculation formula are as follows:
TIt is remaining=TStandard-∑Ln；
Wherein, TStandardFor the normal service life of oil-immersed transformer 1.
Preferably, in step 1, the top-oil temperature θ of the oil-immersed transformer 10It is measured by top-oil temperature probe,
And top-oil temperature probe continues to monitor top-oil temperature in the subsequent operational process of oil-immersed transformer 1, detects for top-oil temperature
Value；Meanwhile obtain 1 local environment of oil-immersed transformer environment temperature T0, and according to the temperature rise test of oil-immersed transformer 1 with
And top layer oil stable state temperature rise Δ θ under the nominal loss that directly obtains of recommendationor, thermal model constant k11, oily timeconstantτO, it is specified
The ratio R of load loss and no-load loss, rated current Ir and total losses calculate the oily index x of top-oil temperature under electric current
Obtain top-oil temperature calculated value θC:
Initial top-oil temperature calculated value is θC(0):
At the end of n-th of sampling period, the calculated value of top-oil temperature is θC(n):
θC(n)=θC(n-1)+DθC(n),
Wherein,
If top-oil temperature probe value and top-oil temperature calculated value θCNumerical difference be more than or equal to m and m > 0, then detect top layer
Whether oil temperature probe works normally.
A kind of oil-immersed transformer life appraisal device applies the oil-immersed transformer lifetime estimation method；
The oil-immersed transformer life appraisal device includes the environment temperature for detecting 1 local environment of oil-immersed transformer
Spend environment temperature probe 30, the top-oil temperature θ for detecting oil-immersed transformer 1 of T0oTop-oil temperature probe, for detecting
The load current detection device and server of the load current I0 of oil-immersed transformer 1；
The environment temperature probe, top-oil temperature probe and current detection means are connected with server respectively, and respectively will
Environment temperature T0, the top-oil temperature θ of detectionoIt is transferred to server with load current I0, server is according to top-oil temperature θo, load
Electric current I0, and the following data directly obtained according to the temperature rise test and recommendation of oil-immersed transformer 1: under rated current around
Temperature rise Δ θ of the group hot(test)-spot temperature to top-oil temperaturehr, thermal model constant k21And k22, winding timeconstantτW, oily timeconstantτO、
Rated current Ir and around class index y, carries out life appraisal to oil-immersed transformer 1.
A kind of oil-immersed transformer life appraisal device based on cloud platform applies the oil-immersed transformer service life
Appraisal procedure；
The oil-immersed transformer life appraisal device based on cloud platform includes for detecting locating for oil-immersed transformer 1
The ambient temperature detection device 3 of the environment temperature T0 of environment, the top-oil temperature θ for detecting oil-immersed transformer 1oTop layer oil
It is temperature probe, the load current detection device of load current I0 for detecting oil-immersed transformer 1, control cabinet 4, protection screen 5, remote
Motivation 6 and cloud platform server 9；
The ambient temperature detection device 3, top-oil temperature probe, load current detection device are connected with control cabinet 4 respectively,
And environment temperature TO, the top-oil temperature θ detected under the control of control cabinet 4oWith load current I0, control cabinet 4 is by above-mentioned data
Be transferred to telecontrol device 6 by protection screen 5, telecontrol device 6 carries out data conversion to the above-mentioned data that protection screen 5 transmits, telecontrol device 6 with
Cloud platform server 9 is connected, and by environment temperature T0, the top-oil temperature θ Jing Guo data conversionoCloud is transferred to load current I0
Platform Server 9, cloud platform server 9 is according to top-oil temperature θoWith load current I0, and the temperature according to oil-immersed transformer 1
Rise the following data that test and recommendation directly acquire: temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under rated currenthr、
Thermal model constant k21And k22, winding timeconstantτW, oily timeconstantτO, rated current Ir and around class index y, to oil immersed type
Transformer 1 carries out life appraisal.
Preferably, the protection screen 5 is connected by serial ports and RS485 with telecontrol device 6；The telecontrol device 6 is logical by GPRS
News module or wire communication module are connected with cloud platform server 9.
Preferably, the cloud platform server 9 includes database server, application server and Web server, database
Server is used to store the data of the input of telecontrol device 6, and the data that application server foundation telecontrol device 6 inputs are to oil-immersed transformer
1 carries out life appraisal；
The oil-immersed transformer life appraisal device based on cloud platform further include be connected with cloud platform server 9 it is remote
The end journey PC 11 and mobile phone terminal 10, Web server issue oil immersed type to the long-range end PC 11 and mobile phone terminal 10 in such a way that Web is issued
The life appraisal result of transformer 1.
It preferably, further include the live end PC 7 being connected with telecontrol device 6, the top layer that the live end PC 7 is exported according to telecontrol device 6
Oil temperature θoWith load current I0, and the following data directly acquired according to the temperature rise test and recommendation of oil-immersed transformer 1:
Temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under rated currenthr, thermal model constant k21And k22, winding timeconstantτW、
Oily timeconstantτO, rated current Ir and around class index y, life appraisal is carried out to oil-immersed transformer 1.
Preferably, the ambient temperature detection device 3 includes temperature transmitter 31, environment temperature probe 30, E shape inner support
With cylindrical hollow sleeve 34；The E shape inner support includes support plate 32, overhead gage 35, lower baffle plate 33 and scapulet 36, overhead gage 35
The upper and lower ends of scapulet 36 are separately positioned on support plate 32 and are connected respectively with 36 right angle of scapulet, and lower baffle plate 33 is arranged in upper gear
It is connected between plate 35 and support plate 32 and with 36 right angle of scapulet, overhead gage 35, lower baffle plate 33 and support plate 32 are respectively positioned on scapulet 36
Side；The cylindrical hollow sleeve 34 is arranged between overhead gage 35 and lower baffle plate 33,34 lower end of cylindrical hollow sleeve and lower block
Plate 33 is fixedly linked, and gap is equipped between upper end and overhead gage 35, and lower baffle plate 33 is equipped with multiple and cylindrical hollow sleeve 34
The corresponding air hole of centre bore；30 upper ends of the environment temperature probe pass through lower baffle plate 33 and are placed in cylindrical hollow sleeve 34, under
End is connected with temperature transmitter 31, and temperature transmitter 31 is fixed in support plate 32.
It preferably, further include support arm 37 and connecting plate 2,36 other side of scapulet is fixedly connected with support arm 37, support arm
37 are fixedly connected with connecting plate 2, and connecting plate 2 is fixedly connected with oil-immersed transformer 1.
Oil-immersed transformer life appraisal device of the invention, the top-oil temperature θ according to oil-immersed transformer 1oWith it is negative
The data such as electric current I0 are carried, the remaining life of oil-immersed transformer is precisely assessed, oil-immersed transformer can be significantly extended
Service life, as long as the operation time limit for reaching its conservative estimation with the oil-immersed transformer active time of the prior art gives more
The substitute mode for the single solution for diverse problems formula changed is compared, more scientific also more economical, significantly reduces the cost of power grid maintenance；And this
The oil-immersed transformer life appraisal device of invention, it can be achieved that oil-immersed transformer real time monitoring, ensure that oil immersed type transformation
The reliable and stable operation of device.
Oil-immersed transformer life appraisal device based on cloud platform of the invention not only has above-mentioned oil immersed type transformation
The technical effect of device life appraisal device, and the long-range monitoring of oil-immersed transformer is realized, it can be used for more oil simultaneously
The life appraisal of immersion transformer.
Oil-immersed transformer lifetime estimation method of the invention realizes the remaining life for oil-immersed transformer 1
Accurate evaluation utmostly extends the service life of oil-immersed transformer 1, reduces the replacement frequency of oil-immersed transformer,
The maintenance cost for having saved power grid also achieves the hot spot temperature of winding for oil-immersed transformer 1, temperature rise, service life, load etc.
The complete detection and diagnosis of various aspects, and can ensure the normal operation of top-oil temperature.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the oil-immersed transformer life appraisal device the present invention is based on cloud platform；
Fig. 2 is the structural schematic diagram of ambient temperature detection device of the present invention；
Specific embodiment
With reference to embodiments, the specific embodiment party of oil-immersed transformer life appraisal device of the invention is further illustrated
Formula.Oil-immersed transformer life appraisal device of the invention is not limited to the following description.
Oil-immersed transformer life appraisal device of the invention applies oil-immersed transformer life appraisal side of the invention
Method；
The oil-immersed transformer life appraisal device includes the environment temperature for detecting 1 local environment of oil-immersed transformer
Spend environment temperature probe 30, the top-oil temperature θ for detecting oil-immersed transformer 1 of T0oTop-oil temperature probe, for detecting
The load current detection device and server of the load current I0 of oil-immersed transformer 1；
The environment temperature probe 30, top-oil temperature probe and current detection means are connected with server respectively, and respectively
Environment temperature T0, the top-oil temperature θ that will testoIt is transferred to server with load current I0, server is according to top-oil temperature θoWith it is negative
Carry electric current I0, and the following data directly obtained according to the temperature rise test and recommendation of oil-immersed transformer (1): rated current
Temperature rise Δ θ of the lower hot spot temperature of winding to top-oil temperaturehr, thermal model constant k21And k22, winding timeconstantτw, the oily time it is normal
Number τO, rated current Ir and around class index y, life appraisal is carried out to oil-immersed transformer 1.
Oil-immersed transformer life appraisal device of the invention, the top-oil temperature θ according to oil-immersed transformer 1oWith it is negative
The data such as electric current I0 are carried, the remaining life of oil-immersed transformer is precisely assessed, oil-immersed transformer can be significantly extended
Service life, as long as the operation time limit for reaching its conservative estimation with the oil-immersed transformer active time of the prior art gives more
The substitute mode for the single solution for diverse problems formula changed is compared, more scientific also more economical, significantly reduces the cost of power grid maintenance；And this
The oil-immersed transformer life appraisal device of invention, it can be achieved that oil-immersed transformer real time monitoring, ensure that oil immersed type transformation
The reliable and stable operation of device.
As shown in Figs. 1-2, invention additionally discloses a kind of oil-immersed transformer life appraisal device based on cloud platform, is adopted
With oil-immersed transformer lifetime estimation method of the present invention.
The oil-immersed transformer life appraisal device based on cloud platform includes for detecting locating for oil-immersed transformer 1
The top-oil temperature of the ambient temperature detection device 3 of the environment temperature T0 of environment, top-oil temperature for detecting oil-immersed transformer 1
Load current detection device, control cabinet 4, the protection screen 5, telemechanical of probe, load current I0 for detecting oil-immersed transformer 1
Machine 6 and cloud platform server 9；
The ambient temperature detection device 3, top-oil temperature probe, load current detection device are connected with control cabinet 4 respectively,
And environment temperature T0, top-oil temperature θ are detected under the control of control cabinet 4oWith load current IO, control cabinet 4 leads to above-mentioned data
Overprotection screen 5 is transferred to telecontrol device 6, and telecontrol device 6 carries out data conversion, telecontrol device 6 and cloud to the above-mentioned data that protection screen 5 transmits
Platform Server 9 is connected, and the above-mentioned data Jing Guo data conversion are transferred to cloud platform server 9, cloud platform server 9 according to
According to top-oil temperature θoWith load current I0, and according to the temperature rise test and recommendation of oil-immersed transformer 1 directly obtain with
Lower data: temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under rated currenthr, thermal model constant k21And k22, the winding time
Constant, τW, oily timeconstantτO, rated current Ir and around class index y, life appraisal is carried out to oil-immersed transformer 1.
It is noted that the telecontrol device 6 is mainly that the data transmitted from serial ports and RS485 are carried out specification to turn
Change, is converted to identifiable specification, data can be shown to the end PC at the scene, while giving data remote transmission to cloud platform service
Device 9；The control cabinet 4 mainly has the air-blower control of transformer, top-oil temperature the functions such as to show, protector 5 is mainly by transformer
The composition such as protective device, switch element, control cabinet 4 and protector 5 are in the oil-immersed transformer longevity of the invention based on cloud platform
Data acquisition and transfer function are mainly realized in life assessment device；The control cabinet 4, protection screen 5, the model of telecontrol device 6 and rule
Lattice, it is different according to the requirement of different substation, and be configured according to substation's actual installation situation.
Oil-immersed transformer life appraisal device based on cloud platform of the invention not only has above-mentioned oil immersed type transformation
The technical effect of device life appraisal device, and the long-range monitoring of oil-immersed transformer is realized, it can be used for more oil simultaneously
The life appraisal of immersion transformer.
Preferably, the protection screen 5 is connected by serial ports and RS485 with telecontrol device 6.
Preferably, the telecontrol device 6 is connected by GPRS communication module or wire communication module with cloud platform server 9,
Keep the networking mode of the oil-immersed transformer life appraisal device of the invention based on cloud platform more flexible.
Preferably, as shown in Figure 1, the oil-immersed transformer life appraisal device of the invention based on cloud platform further include with
The connected long-range end PC 11 of cloud platform server 9 and mobile phone terminal 10.The cloud platform server 9 includes database server, answers
With server and Web server, database server is used to store the data of the input of telecontrol device 6, and application server is according to telemechanical
Data (i.e. the environment temperature T0, top-oil temperature θ that machine 6 inputsoThe progress service life of oil-immersed transformer 1 is commented with load current I0)
Estimate, Web server is commented by the way of Web publication to the service life that oil-immersed transformer 1 is issued at the long-range end PC 11 and mobile phone terminal 10
Estimate as a result, checking the remaining life and operational data of oil-immersed transformer 1 whenever and wherever possible convenient for staff.
It preferably, further include the live end PC 7 being connected with telecontrol device 6, the live end PC uses oil immersed type transformation of the invention
Device lifetime estimation method, environment temperature T0, the top-oil temperature θ exported according to telecontrol device 6oWith load current I0 to oil immersed type transformation
Device carries out life appraisal, and the live end PC 7 checks the remaining life and work number of oil-immersed transformer 1 convenient for staff scene
According to determine whether the oil-immersed transformer 1 needs replacing.It is, of course, also possible to using other control equipment with processor
Carry out oil-immersed transformer life appraisal.
Preferably, as shown in Fig. 2, the ambient temperature detection device 3 includes temperature transmitter 31, environment temperature probe
30, E shape inner support and cylindrical hollow sleeve 34；The E shape inner support includes support plate 32, overhead gage 35, lower baffle plate 33 and shoulder
Plate 36, overhead gage 35 and support plate 32 are separately positioned on the upper and lower ends of scapulet 36 and are connected respectively with 36 right angle of scapulet, lower block
Plate 33 is arranged between overhead gage 35 and support plate 32 and is connected with 36 right angle of scapulet, overhead gage 35, lower baffle plate 33 and support plate
32 are respectively positioned on 36 side of scapulet；The cylindrical hollow sleeve 34 is arranged between overhead gage 35 and lower baffle plate 33, cylindrical hollow set
34 lower ends of cylinder are fixedly linked with lower baffle 33, and gap is equipped between upper end and overhead gage 35, and lower baffle plate 33 is equipped with multiple and circle
The centre bore of column hollow sleeve 34 corresponds to air hole；30 upper ends of the environment temperature probe pass through lower baffle plate 33 and are placed in cylindrical hollow
In sleeve 34, lower end is connected with temperature transmitter 31, and temperature transmitter 31 is fixed in support plate 32.Branch in the E shape
Frame and cylindrical hollow sleeve 34 form effective protection to temperature transmitter 31 and environment temperature probe 30, avoid the two from being exposed to the sun, rain
The adverse effect of leaching etc., can significantly extend the service life of temperature transmitter 31 and environment temperature probe 30, and assemble simple.
Preferably, as shown in Fig. 2, the ambient temperature detection device 3 further includes support arm 37 and connecting plate 2, scapulet 36
The other side is fixedly connected with support arm 37, and support arm 37 is fixedly connected with fixed plate 2, and connecting plate 2 and oil-immersed transformer 1 are fixed
Connection.Specifically, vertical portion is fixedly connected with the left side of scapulet 36 as shown in Fig. 2, the support arm 37 is L-shaped structure,
The left end of its horizontal component is fixedly connected with connecting plate 2；The connecting plate 2 be U-shaped structure, the two-arm of U-shaped structure respectively with
Oil-immersed transformer 1 is fixedly connected, and the plate outer side of U-shaped structure is fixedly connected with support arm 37.
The top-oil temperature θ for being used to detect oil-immersed transformer 1oTop-oil temperature probe and for detect oil immersed type become
The load current detection device of the load current I0 of depressor 1 is that the state of the art be not described in detail.It can certainly use
Other equipment or method obtain top-oil temperature θoWith load current I0.
Preferably, the ambient temperature detection device can also install sound and light alarm module additional, when environment temperature T0 is more than 40
DEG C when, sound and light alarm module can beep and flash, and remind staff's environment temperature to occur abnormal.
Invention additionally discloses a kind of oil-immersed transformer lifetime estimation methods comprising following steps:
Step 1 at least obtains the following data of oil-immersed transformer 1: the top-oil temperature θ of oil-immersed transformer 1oAnd
The load current I0 of oil-immersed transformer 1, and directly obtained according to the temperature rise test and recommendation of oil-immersed transformer 1
Temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under rated currenthr, thermal model constant k21And k22, winding timeconstantτW、
Oil temperature timeconstantτO, rated current Ir and around class index y；By taking some transformer as an example, initial top-oil temperature θoIt is 70.8
DEG C, the temperature rise Δ θ of top-oil temperaturehrIt is 35, thermal model constant k21It is 2, k22It is 2, winding timeconstantτWIt is normal for 7, oil temperature time
Number τOIt is 1.3 for 150 and around class index y, sampling period t is 3min, and the runing time of oil-immersed transformer 1 is tW。
For example, working as tWWhen=0, load factor K (load current I0/ rated current Ir)=0.99, as t=3min (
At the end of 1st sampling period), K=1.01, can calculate hot spot temperature of winding according to difference equation formula is 97.6 DEG C, works as tW
When=6min (at the end of the 2nd sampling period), K=1.12, hot spot temperature of winding is 101 DEG C, works as tWThe (the 3rd when=9min
At the end of sampling period), K=1.25, hot spot temperature of winding is 106.4 DEG C；
Step 2 carries out life appraisal, life appraisal to oil-immersed transformer 1 according to data acquired in step 1
Specific step is as follows:
Initial temperature rise of hot spot first item:
Δθh1(0)=k21×ΔθhrKy；
Initial temperature rise of hot spot Section 2:
Δθh2(0)=(k21-1)×ΔθhrKy；
Step 2 A calculates the hot spot temperature of winding that n-th of sampling period is t according to the difference equation formula of temperature rise of hot spot
θh(n), n be integer and n >=1,
The temperature rise of hot spot first item in n-th of sampling period:
Δθh1(n)=Δ θh1(n-1)+DΔθh1(n),
Wherein,
The temperature rise of hot spot Section 2 in n-th of sampling period:
Δθh2(n)=Δ θh2(n-1)+DΔθh2(n),
Wherein,
At the end of n-th of sampling period, temperature rise of the hot spot temperature of winding to top-oil temperature:
Δθh(n)=Δ θh1(n)-Δθh2(n)；
At the end of n-th of sampling period, hot spot temperature of winding:
θh(n)=θo+Δθh(n)；
Wherein, K is load factor, K=load current I0/ rated current Ir；
The following are a specific example of step A, the runing time of oil-immersed transformer 1 is tW, the sampling period, t was
3min:
Work as tWWhen=0,
Calculate initial hotspots temperature rise first item Δ θh1(0):
Δθh1(0)=k21×ΔθhrKy；
Calculate initial temperature rise of hot spot Section 2 Δ θh2(0):
Δθh2(0)=(k21-1)×ΔθhrKy；
Work as tWWhen=3min (at the end of the first sampling period),
Calculate temperature rise of hot spot first item Δ θh1(1):
Δθh1(1)=Δ θh1(0)+DΔθh1(1),
Wherein,
Calculate temperature rise of hot spot Section 2 Δ θh2(1):
Δθh2(1)=Δ θh2(0)+DΔθh2(1),
Wherein,
Temperature rise Δ θ of the hot spot temperature of winding to top-oil temperatureh(1)Are as follows:
Δθh(1)=Δ θh1(1)-Δθh2(1)；
Hot spot temperature of winding θh(1)Are as follows:
θh(1)=θ0+Δθh(1), θ is calculatedh(1)It is 97.6 DEG C；
Work as tWWhen=6min, the hot spot temperature of winding at the end of algorithm above calculates the 2nd sampling period of calculating is repeated
θh(2)=θ0+Δθh(2), obtain θh(2)It is 101 DEG C.Work as tWWhen=9min, repeats algorithm above and calculate the 3rd sampling period
Hot spot temperature of winding θh(3)It is 106.4 DEG C.Hot spot temperature of winding at the end of each sampling period can be calculated by the above process
Exact numerical values recited.
Step 2 B, the hot spot temperature of winding θ being calculated according to step 2 AhTo calculate oil-immersed transformer (1) residue
Service life, specific calculating process are as follows:
At the end of n-th of sampling period, the opposite ageing rate V in the sampling periodnCalculation formula are as follows:
Oil-immersed transformer (1) is calculated in the life loss in the sampling period according to the opposite ageing rate V in the sampling period
Ln, calculation formula are as follows:
According to the life loss L in each sampling periodnCalculate the remaining life T of oil-immersed transformer (1)It is remaining, oil immersed type transformation
The remaining life formula of device 1 are as follows:
TIt is remaining=TStandard-∑Ln；
Wherein TStandardFor the normal service life of oil-immersed transformer 1, such as TStandardIt is 40 years, by the 1st sampling period
Afterwards, L1For 2.86min；After the 2nd sampling period, L2For 6.64min；After the 3rd sampling period, L3For
14.2min, then after three sampling periods, the remaining life T of oil-immersed transformer 1It is remainingFor TStandard-(L1+L2+L3)=(40
Year -2.86min-6.64min-14.2min).
It is noted that the remaining life T of above-mentioned calculating oil-immersed transformerIt is remainingDuring, it also achieves for oil immersion
The load condition of formula transformer 1 monitors, i.e., mainly realizes for the load current I0 of oil-immersed transformer 1 and the prison of temperature rise
It surveys.
Preferably, in step 1, the initial top-oil temperature θ of the oil-immersed transformer 10It is popped one's head in by top-oil temperature
It measures, and top-oil temperature probe continues to monitor top-oil temperature in the subsequent operational process of oil-immersed transformer 1, is top layer oil
Warm probe value；Meanwhile the environment temperature T0 of 1 local environment of oil-immersed transformer is obtained, top-oil temperature predicted value passes through environment temperature
Degree T0 and load current I0 is calculated, and is directly obtained according to the temperature rise test of oil-immersed transformer 1 and recommendation specified
Lower top layer oil stable state temperature rise Δ θ is lostor, thermal model constant k11, oily timeconstantτO, load loss and unloaded damage under rated current
Top-oil temperature calculated value θ is calculated to the oily index x of top-oil temperature in ratio R, rated current Ir and the total losses of consumptionC:
Initial top-oil temperature calculated value is θC(0):
At the end of n-th of sampling period, the calculated value of top-oil temperature is θC(n):
θC(n)=θC(n-1)+DθC(n),
Wherein,
If top-oil temperature probe value and top-oil temperature calculated value θCNumerical difference be more than or equal to m and m > 0, then detect top layer
Whether oil temperature probe works normally.Further, the m can be the arbitrary number between 0-10, and m can be 10, m and can be greatly
In 10 arbitrary number.
Oil-immersed transformer lifetime estimation method of the invention realizes the remaining life for oil-immersed transformer 1
Accurate evaluation utmostly extends the service life of oil-immersed transformer 1, reduces the replacement frequency of oil-immersed transformer,
The maintenance cost for having saved power grid also achieves the hot spot temperature of winding for oil-immersed transformer 1, temperature rise, service life, load etc.
The complete detection and diagnosis of various aspects, and can ensure the normal operation of top-oil temperature.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, In
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (9)
1. a kind of oil-immersed transformer lifetime estimation method, which is characterized in that itself the following steps are included:
Step 1 at least obtains the following data of oil-immersed transformer (1): the top-oil temperature θ of oil-immersed transformer (1)O, oil immersion
The load current I0 of formula transformer (1), and directly obtained according to the temperature rise test and recommendation of oil-immersed transformer (1)
Temperature rise Δ θ of the hot spot temperature of winding to top-oil temperature under rated currenthr, thermal model constant k21And k22, winding timeconstantτW、
Oil temperature timeconstantτO, rated current Ir and around class index y；
Step 2 carries out life appraisal to oil-immersed transformer (1) according to data acquired in step 1, life appraisal
Specific step is as follows:
Initial temperature rise of hot spot first item:
Δθh1(0)=k21×ΔθhrKy；
Initial temperature rise of hot spot Section 2:
Δθh2(0)=(k21-1)×ΔθhrKy；
Step 2 A calculates the hot spot temperature of winding θ that n-th of sampling period is t according to the difference equation formula of temperature rise of hot spoth(n), n
For integer and n >=1,
The temperature rise of hot spot first item in n-th of sampling period:
Δθh1(n)=Δ θh1(n-1)+DΔθh1(n),
Wherein,
The temperature rise of hot spot Section 2 in n-th of sampling period:
Δθh2(n)=Δ Δh2(n-1)+DΔθh2(n),
Wherein,
At the end of n-th of sampling period, temperature rise of the hot spot temperature of winding to top-oil temperature:
Δθh(n)=Δ θh1(n)-Δθh2(n)；
At the end of n-th of sampling period, hot spot temperature of winding:
θh(n)=θO+Δθh(n)；
Wherein, K is load factor, K=load current I0/ rated current Ir；
Step 2 B calculates the remaining life of oil-immersed transformer according to the hot spot temperature of winding being calculated in step 2 A,
Specific calculating process is as follows:
At the end of n-th of sampling period, the opposite ageing rate V in the sampling periodnCalculation formula are as follows:
According to the opposite ageing rate V in the sampling periodnOil-immersed transformer (1) is calculated in the life loss L in the sampling periodn, meter
Calculate formula are as follows:
Ln=∫0 tVndt
The remaining life T of oil-immersed transformer (1) is calculated according to life lossIt is remaining, calculation formula are as follows:
TIt is remaining=TStandard-∑Ln；
Wherein, TStandardFor the normal service life of oil-immersed transformer (1).
2. oil-immersed transformer lifetime estimation method according to claim 1, it is characterised in that: described in step 1
The top-oil temperature θ of oil-immersed transformer (1)0It is measured by top-oil temperature probe, and top-oil temperature probe is in oil-immersed transformer
(1) in subsequent operational process, top-oil temperature is continued to monitor, is top-oil temperature probe value；Meanwhile obtaining oil-immersed transformer
(1) the environment temperature T0 of local environment, and the volume directly obtained according to the temperature rise test of oil-immersed transformer (1) and recommendation
Setting loss consumes lower top layer oil stable state temperature rise Δ θor, thermal model constant k11, oily timeconstantτO, load loss and unloaded under rated current
Top-oil temperature calculated value θ is calculated to the oily index x of top-oil temperature in ratio R, rated current Ir and the total losses of lossC:
Initial top-oil temperature calculated value is θC(0):
At the end of n-th of sampling period, the calculated value of top-oil temperature is θC(n):
θC(n)=θC(n-1)+DθC(n),
Wherein,
If top-oil temperature probe value and top-oil temperature calculated value θCNumerical difference be more than or equal to m and m > 0, then detect top-oil temperature spy
Whether head works normally.
3. a kind of oil-immersed transformer life appraisal device, which is characterized in that it is using described in any one of claim 1-2
Oil-immersed transformer lifetime estimation method；
The oil-immersed transformer life appraisal device includes the environment temperature for detecting oil-immersed transformer (1) local environment
Environment temperature probe (30), the top-oil temperature θ for detecting oil-immersed transformer (1) of T0OTop-oil temperature probe, for examining
Survey the load current detection device and server of the load current I0 of oil-immersed transformer (1)；
The environment temperature probe, top-oil temperature probe and current detection means are connected with server respectively, and will test respectively
Environment temperature T0, top-oil temperature θOIt is transferred to server with load current I0, server is according to top-oil temperature θO, load current
I0, and the following data directly obtained according to the temperature rise test and recommendation of oil-immersed transformer (1): winding under rated current
Temperature rise Δ θ of the hot(test)-spot temperature to top-oil temperaturehr, thermal model constant k21And k22, winding timeconstantτW, oily timeconstantτO, volume
Constant current Ir and around class index y, carries out life appraisal to oil-immersed transformer (1).
4. a kind of oil-immersed transformer life appraisal device based on cloud platform, which is characterized in that it is using claim 1-2's
Oil-immersed transformer lifetime estimation method described in any one；
The oil-immersed transformer life appraisal device based on cloud platform includes for detecting ring locating for oil-immersed transformer (1)
Ambient temperature detection device (3), the top-oil temperature θ for detecting oil-immersed transformer (1) of the environment temperature T0 in borderOTop layer
Oil temperature probe, the load current detection device of load current I0 for detecting oil-immersed transformer (1), control cabinet (4), protection
Shield (5), telecontrol device (6) and cloud platform server (9)；
The ambient temperature detection device (3), top-oil temperature probe, load current detection device are connected with control cabinet (4) respectively,
And environment temperature T0, the top-oil temperature θ detected under the control of control cabinet (4)OWith load current I0, control cabinet (4) will be above-mentioned
Data are transferred to telecontrol device (6) by protection screen (5), and telecontrol device (6) carries out data to the above-mentioned data that protection screen (5) transmits and turns
It changes, telecontrol device (6) is connected with cloud platform server (9), and by environment temperature T0, the top-oil temperature θ Jing Guo data conversionOWith it is negative
It carries electric current I0 to be transferred to cloud platform server (9), cloud platform server (9) is according to top-oil temperature θOWith load current I0, and
The following data directly acquired according to the temperature rise test of oil-immersed transformer (1) and recommendation: coiling hotspot temperature under rated current
Spend the temperature rise Δ θ to top-oil temperaturehr, thermal model constant k21And k22, winding timeconstantτW, oily timeconstantτO, rated current
Ir and around class index y, carries out life appraisal to oil-immersed transformer (1).
5. the oil-immersed transformer life appraisal platform according to claim 4 based on cloud platform, it is characterised in that: described
Protection screen (5) is connected by serial ports and RS485 with telecontrol device (6)；The telecontrol device (6) passes through GPRS communication module or cable modem
News module is connected with cloud platform server (9).
6. the oil-immersed transformer life appraisal device according to claim 4 based on cloud platform, it is characterised in that: described
Cloud platform server (9) includes database server, application server and Web server, and database server is remote for storing
The data of motivation (6) input, application server carry out the service life to oil-immersed transformer (1) according to the data of telecontrol device (6) input
Assessment；
The oil-immersed transformer life appraisal device based on cloud platform further include be connected with cloud platform server (9) it is long-range
The end PC (11) and mobile phone terminal (10), Web server are issued in such a way that Web is issued to the long-range end PC (11) and mobile phone terminal (10)
The life appraisal result of oil-immersed transformer (1).
7. the oil-immersed transformer life appraisal platform according to claim 4 based on cloud platform, it is characterised in that: also wrap
Include the live end PC (7) being connected with telecontrol device (6), top-oil temperature θ of the live end PC (7) according to telecontrol device (6) outputOAnd load
Electric current I0, and the following data directly acquired according to the temperature rise test and recommendation of oil-immersed transformer (1): under rated current
Temperature rise Δ θ of the hot spot temperature of winding to top-oil temperaturehr, thermal model constant k21And k22, winding timeconstantτW, oily time constant
τO, rated current Ir and around class index y, life appraisal is carried out to oil-immersed transformer (1).
8. the oil-immersed transformer life appraisal device according to claim 4 based on cloud platform, it is characterised in that: described
Ambient temperature detection device (3) includes temperature transmitter (31), environment temperature probe (30), E shape inner support and cylindrical hollow set
Cylinder (34)；The E shape inner support includes support plate (32), overhead gage (35), lower baffle plate (33) and scapulet (36), overhead gage (35)
The upper and lower ends of scapulet (36) are separately positioned on support plate (32) and are connected respectively with scapulet (36) right angle, and lower baffle plate (33) is set
It sets between overhead gage (35) and support plate (32) and is connected with scapulet (36) right angle, overhead gage (35), lower baffle plate (33) and branch
Fagging (32) is respectively positioned on scapulet (36) side；The cylindrical hollow sleeve (34) setting overhead gage (35) and lower baffle plate (33) it
Between, cylindrical hollow sleeve (34) lower end is fixedly linked with lower baffle plate (33), and gap, lower block are equipped between upper end and overhead gage (35)
Plate (33) is equipped with multiple air holes corresponding with the centre bore of cylindrical hollow sleeve (34)；On the environment temperature probe (30)
End is placed in cylindrical hollow sleeve (34) across lower baffle plate (33), and lower end is connected with temperature transmitter (31), temperature transmitter
(31) it is fixed on support plate (32).
9. the oil-immersed transformer life appraisal device according to claim 8 based on cloud platform, it is characterised in that: also wrap
Support arm (37) and connecting plate (2) are included, scapulet (36) other side is fixedly connected with support arm (37), support arm (37) and connecting plate
(2) it is fixedly connected, connecting plate (2) is fixedly connected with oil-immersed transformer (1).
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