CN108089101A - A kind of appraisal procedure of scene casing insulation ag(e)ing state - Google Patents
A kind of appraisal procedure of scene casing insulation ag(e)ing state Download PDFInfo
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- CN108089101A CN108089101A CN201711140017.7A CN201711140017A CN108089101A CN 108089101 A CN108089101 A CN 108089101A CN 201711140017 A CN201711140017 A CN 201711140017A CN 108089101 A CN108089101 A CN 108089101A
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- casing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
Abstract
The invention discloses a kind of appraisal procedures of live casing insulation ag(e)ing state, comprise the following steps：1) casing external insulation temperature is tested；2) hot(test)-spot temperature in casing is estimated；3) temperature at casing contact tube two-end-point is measured；4) position of hot(test)-spot temperature in casing is estimated；5) the insulation ag(e)ing state of casing is assessed；6) risk factor of casing insulation ag(e)ing is assessed.The present invention can accurately obtain the hot(test)-spot temperature value in casing and hot(test)-spot temperature position under conditions of casing interior insulation is not destroyed, and pass through hot(test)-spot temperature and degree of polymerization relation and can effectively assess the ageing state that time limit rear sleeve is centainly run in scene, and then effective assessment is made to the risk factor of casing insulation ag(e)ing, the operation of transformer is not influenced, is conducive to the normal power supply of resident.
Description
Technical field
The present invention relates to casing Condition assessment of insulation field more particularly to a kind of assessments of live casing insulation ag(e)ing state
Method.
Background technology
Connection equipment of the casing as transformer and power grid plays fixed inside transformer outlet and realizes transformer and electricity
The effect of net connection insulation.With the raising of voltage class, the radial dimension of casing can also increase therewith, when sleeve field is run
Under the double action of interior insulation dielectric loss and current-carrying contact tube joule heat, interior insulation is oversized to cause inside pipe casing
Heat dissipation is difficult, is likely to result in the local serious overheat of casing interior insulation, and generates hot(test)-spot temperature in weakness, casing interior insulation
Weak link can accelerate the aging of casing interior insulation under the action of hot(test)-spot temperature for a long time, and then influence the active time of casing.
At present to the monitoring means of casing insulation ag(e)ing state and appraisal procedure mainly casing is offline or inspecting state
Lower physics and chemistry or electric parameter using measurement ＆ characterization casing insulation ag(e)ing feature, and these methods or destruction set pipe insulation or introducing
External interference, the reliability and feasibility of impact evaluation, and off-line maintenance can influence the normal electricity consumption of resident.
Therefore, in order to reliably assess the risk that casing insulation ag(e)ing is brought to casing safety operation, it is badly in need of a kind of
The appraisal procedure of live casing insulation ag(e)ing state.
The content of the invention
In order to not destroy under conditions of casing interior insulation the hot(test)-spot temperature value and hot spot temperature that accurately obtain in casing
Position is spent, can effectively assess the ageing state after certain run time with insulation degree of polymerization relation by hot(test)-spot temperature, and it is right
The risk factor of casing insulation ag(e)ing makes effective assessment, and the present invention provides a kind of assessments of live casing insulation ag(e)ing state
Method.
A kind of appraisal procedure of scene casing insulation ag(e)ing state, comprises the following steps：
The first step：Test the external insulation temperature of casing；
The temperature of insulator on casing external insulation is tested, record test result is T1(degree Celsius) tests the temperature of casing flange
Degree, record test result are T2, the display of oil tank of transformer temperature measuring device is read as a result, and it is T to record display result3；
Second step：Estimate the hot(test)-spot temperature in casing；
The hot(test)-spot temperature value in casing can be estimated according to equation below, is denoted as TM；
3rd step：Measure the temperature at casing contact tube two-end-point；
Casing contact tube is tested by temperature at army cap, is denoted as T4, read casing contact tube temperature at oil tank of transformer, note
For T3；
4th step：Estimate the position of hot(test)-spot temperature in casing；
Position in casing away from casing contact tube colder side at hot(test)-spot temperature can be estimated according to equation below, be denoted as LMIt is (single
Position is m)；
5th step：Assess the insulation ag(e)ing state of casing；
It checks casing initial factory to be assessed report, records casing to be assessed and dispatch from the factory the insulation degree of polymerization before operation, record
The insulation degree of polymerization is DP(0), the insulation degree of polymerization of run time t (year) rear sleeve is set as DP(t), can be assessed according to equation below
The insulation ag(e)ing state of casing；
DP(t)=DP(0)-Atexp(-E/R(TM+273.15))·DP(0) 2+(Atexp(-E/R(TM+273.15)))2·
DP(0) 3
Wherein, E is that activation energy is 113KJ/mol, and R is that perfect gas constant value is 8.314J/ (molK), and A refers to
It is preceding because subvalue be 5.74 × 108；
6th step：Assess the risk factor of casing insulation ag(e)ing；
Degree of polymerization when casing insulation life reaches terminal is set as DP(n), casing aging shape can be assessed according to equation below
Risk factor m under state；
Wherein, σ, λ are risk assessment parameter, can determine that the insulation ag(e)ing state of casing is in risk when m is more than 0.842
In.
The technical solution that the application provides includes following advantageous effects：
This application provides a kind of appraisal procedure of live casing insulation ag(e)ing state, with being needed in the prior art in casing
Destruction set pipe insulation, which is detected, under offline or inspecting state compares, and the insulation ag(e)ing state evaluating method that the application provides can
The hot(test)-spot temperature value in casing and hot(test)-spot temperature position are accurately obtained under conditions of casing interior insulation is not destroyed, passes through hot spot temperature
Degree can effectively assess the ageing state after certain run time with insulation degree of polymerization relation, and to the risk of casing insulation ag(e)ing
Coefficient makes effective assessment.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of appraisal procedure flow chart of live casing insulation ag(e)ing state provided by the embodiments of the present application.
Specific embodiment
Attached drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the application
Example, and for explaining the principle of the application together with specification.
It in order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of appraisal procedure flow chart of live casing insulation ag(e)ing state provided by the embodiments of the present application, referring to
Fig. 1, this method comprises the following steps：
S101：Test the external insulation temperature of casing.
By temperature sensor or temperature temperature measuring equipment, the external insulation temperature of casing to be detected is measured.Wherein test casing
The temperature of insulator on external insulation, record test result are T1(degree Celsius), tests the temperature of casing flange, and record test result is
T2, the display of oil tank of transformer temperature measuring device is read as a result, and it is T to record display result3。
It should be noted that in detection insulation insulator temperature, the temperature of casing flange and the temperature of oil tank of transformer
When, repeated detection can be carried out to it, obtains the temperature value repeatedly measured or the temperature averages for asking for casing each several part respectively,
To improve the accuracy of test temperature, and then the accuracy of casing insulation ag(e)ing risk factor assessment is improved, be conducive to work people
Member in time replaces casing.
S102：Estimate the hot(test)-spot temperature in casing.
The hot(test)-spot temperature value in casing can be estimated according to equation below, is denoted as TM；
The hot(test)-spot temperature refers in bushing longtime running, since internal environment more seals, contact tube joule heat
The heat of generation scatters and disappears more difficult, and each part material performance is not completely the same during fabrication for casing, is likely to result in set
The serious overheat of pipe interior insulation part can generate higher hot(test)-spot temperature in casing weakness at this time.
It is possible it is a kind of in the case of, the hot(test)-spot temperature of casing, the temperature of insulator and the temperature of flange in insulation in the calculation
Value can be the average value after repeatedly measurement, in another case, being also likely to be the temperature value repeatedly measured, this is repeatedly measured
Temperature value is brought into formula, can estimate to obtain multiple hot(test)-spot temperature values, the hot(test)-spot temperature in casing of averaging to it.With
Upper two ways can improve the accuracy that hot(test)-spot temperature is estimated in casing, be conducive to improve to casing insulation ag(e)ing status assessment
Accuracy.
S103：Measure the temperature at casing contact tube two-end-point.
Casing contact tube is tested by temperature at army cap, is denoted as T4, read casing contact tube temperature at oil tank of transformer, note
For T3.When measuring the temperature at casing contact tube two-end-point, it can be taken multiple measurements, and ask for surveying survey at two-end-point more
The average temperature value of amount, to reduce the error of measurement.
S104：Estimate the position of hot(test)-spot temperature in casing.
Position in casing away from casing contact tube colder side at hot(test)-spot temperature can be estimated according to equation below, be denoted as LMIt is (single
Position is m)；
In casing longtime running, local overheat is generated since heat dissipation is difficult, hot spot temperature is generated in casing weakness
Degree, as the time increases, which can accelerate the aging of casing, therefore hot(test)-spot temperature position under the action of hot(test)-spot temperature
It is the position that aging most easily occurs for casing.Staff can be according to the position of hot(test)-spot temperature, to the aging conditions at the casing position
Emphasis monitoring is carried out, carries out maintenance and replaces in time, avoids influencing normal power supply.
When above formula is used to carry out the calculating of hot(test)-spot temperature position, hot(test)-spot temperature, oil tank of transformer in casing can be used
Temperature at army cap is repeatedly measured obtained average value by temperature and contact tube, reduces measurement error, improves the position of hot(test)-spot temperature
The accuracy of estimation, improve the judgement to casing aging position monitoring, be conducive to staff in time to casing carry out maintenance and
It replaces, avoids bringing threat to the operation of electric system.
S105：Assess the insulation ag(e)ing state of casing.
It should be noted that in the embodiment of the present application, the insulation ag(e)ing state of casing is by casing under current state
The insulation degree of polymerization characterize, that is, run the insulation degree of polymerization of certain time rear sleeve to represent.The degree of polymerization can directly reflect absolutely
The degree of aging of edge, the measurement of the degree of polymerization is the important assay method of insulation ag(e)ing, can be reflected according to the insulation degree of polymerization of casing
Run the insulation ag(e)ing degree of certain time rear sleeve.
When casing is run under the double action of interior insulation dielectric loss and current-carrying contact tube joule heat, interior insulation size
Crossing conference causes inside pipe casing heat dissipation difficult, is likely to result in the local serious overheat of casing interior insulation, and generates heat in weakness
Point temperature, and the effect of hot(test)-spot temperature can accelerate the aging of casing interior insulation, so as to change the insulation degree of polymerization of casing.It thus can
The insulation degree of polymerization for running certain time rear sleeve is estimated according to the insulation degree of polymerization that hot(test)-spot temperature and casing are initial.
It checks casing initial factory to be assessed report, records casing to be assessed and dispatch from the factory the insulation degree of polymerization before operation, record
The insulation degree of polymerization is DP(0), the insulation degree of polymerization of run time t (year) rear sleeve is set as DP(t), can be assessed according to equation below
The insulation ag(e)ing state of casing；
DP(t)=DP(0)-Atexp(-E/R(TM+273.15))·DP(0) 2+(Atexp(-E/R(TM+273.15)))2·
DP(0) 3
Wherein, E is that activation energy is 113KJ/mol, and R is that perfect gas constant value is 8.314J/ (molK), and A refers to
It is preceding because subvalue be 5.74 × 108。
S106：Assess the risk factor of casing insulation ag(e)ing.
Degree of polymerization when casing insulation life reaches terminal is set as DP(n), casing aging shape can be assessed according to equation below
Risk factor m under state；
Wherein, σ, λ are risk assessment parameter, can determine that the insulation ag(e)ing state of casing is in risk when m is more than 0.842
In.
The insulation degree of polymerization of the insulation degree of polymerization and casing operation after a certain period of time during according to casing terminal, can using formula
Calculate the risk factor of the insulation ag(e)ing state of casing operation after a certain period of time.Risk factor clearly can directly show to insulate
Ageing state is conducive to staff and accurately understands the current degree of aging of casing, and carries out maintenance replacement to casing in time, keeps away
Exempt from due to replacing not in time, and risk is brought to electric power safety operation, influence the normal power supply of resident.
When the ageing state to casing is assessed, the external insulation temperature of casing is obtained first, using external insulation temperature,
Using the hot(test)-spot temperature in formula estimation casing.Initial insulation temperature when being dispatched from the factory according to obtained hot(test)-spot temperature and casing,
The insulation degree of polymerization of operation certain time rear sleeve can be estimated by formula, and then is gathered according to the insulation of operation after a certain period of time
The right insulation ag(e)ing state to casing is assessed.The insulation degree of polymerization and casing according to running after a certain period of time are reached home
When the insulation degree of polymerization, by formula, the risk factor of casing ageing state can be calculated, to running casing ageing state
Risk factor make effective assessment.
This application provides a kind of appraisal procedures of live casing insulation ag(e)ing state.With being needed in the prior art in casing
It is sampled in the state of offline or maintenance or state of insulation parameter detecting is compared, the insulation ag(e)ing state that the application provides
Appraisal procedure can obtain the hot(test)-spot temperature in casing under conditions of casing on-line operation.And pass through hot(test)-spot temperature and assess casing
Insulation ag(e)ing state, effective assessment is made to the risk factor of its insulation ag(e)ing, does not influence the normal operation of transformer, has
Beneficial to resident's normal electricity consumption.
It should be noted that the relational terms of such as " first " and " second " or the like be used merely to an entity or
Operation is distinguished with another entity or operation, and without necessarily requiring or implying between these entities or operation, there are any
This actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant be intended to it is non-exclusive
Property include so that article or equipment including a series of elements not only include those elements, but also including not having
It the other element that is expressly recited or further includes as elements inherent to such a process, method, article, or device.Do not having
There is the element in the case of more limiting, limited by sentence "including a ...", it is not excluded that including the mistake of the element
Also there are other identical elements in journey, method, article or equipment.
The above is only the specific embodiment of the application, is made skilled artisans appreciate that or realizing this Shen
Please.A variety of modifications of these embodiments will be apparent to one skilled in the art, it is as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
It should be appreciated that the content that the application is not limited to be described above and be shown in the drawings, and can
To carry out various modifications and change without departing from the scope.Scope of the present application is only limited by appended claim.
Claims (1)
1. a kind of appraisal procedure of scene casing insulation ag(e)ing state, which is characterized in that comprise the following steps：
The first step：Test the external insulation temperature of casing；
The temperature of insulator on casing external insulation is tested, record test result is T1(degree Celsius) tests the temperature of casing flange, note
Record test result is T2, the display of oil tank of transformer temperature measuring device is read as a result, and it is T to record display result3；
Second step：Estimate the hot(test)-spot temperature in casing；
The hot(test)-spot temperature value in casing can be estimated according to equation below, is denoted as TM；
3rd step：Measure the temperature at casing contact tube two-end-point；
Casing contact tube is tested by temperature at army cap, is denoted as T4, casing contact tube temperature at oil tank of transformer is read, is denoted as T3；
4th step：Estimate the position of hot(test)-spot temperature in casing；
Position in casing away from casing contact tube colder side at hot(test)-spot temperature can be estimated according to equation below, be denoted as LM(unit m)；
5th step：Assess the insulation ag(e)ing state of casing；
It checks casing initial factory to be assessed report, records casing to be assessed and dispatch from the factory the insulation degree of polymerization before operation, record insulation
The degree of polymerization is DP(0), the insulation degree of polymerization of run time t (year) rear sleeve is set as DP(t), can casing be assessed according to equation below
Insulation ag(e)ing state；
DP(t)=DP(0)-Atexp(-E/R(TM+273.15))·DP(0) 2+(Atexp(-E/R(TM+273.15)))2·DP(0) 3
Wherein, E is that activation energy is 113KJ/mol, and R is that perfect gas constant value is 8.314J/ (molK), and A refers to cause
Subvalue is 5.74 × 108；
6th step：Assess the risk factor of casing insulation ag(e)ing；
Degree of polymerization when casing insulation life reaches terminal is set as DP (n), casing ageing state can be assessed according to equation below
Under risk factor m；
Wherein, σ, λ are risk assessment parameter, can determine that the insulation ag(e)ing state of casing is in risk when m is more than 0.842.
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| CN201711140017.7A CN108089101B (en) | 2017-11-16 | 2017-11-16 | A kind of appraisal procedure of scene casing insulation ag(e)ing state |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109283408A (en) * | 2018-08-28 | 2019-01-29 | 南方电网科学研究院有限责任公司 | A kind of combined electrical apparatus insulating part health status prediction technique |
| CN110794274A (en) * | 2019-12-05 | 2020-02-14 | 广西博电科技有限公司 | Oil-immersed paper sleeve main insulation non-uniform aging state evaluation method based on correction X model |
| CN112595997A (en) * | 2020-11-30 | 2021-04-02 | 保定天威集团特变电气有限公司 | Device and method for measuring temperature rise of outlet structure of transformer oil tank |
| CN112798871A (en) * | 2020-12-07 | 2021-05-14 | 广西电网有限责任公司电力科学研究院 | Method for processing field reasons of dielectric loss value abnormity of oiled paper insulation capacitive bushing |
| CN113156294A (en) * | 2021-03-23 | 2021-07-23 | 英特尔产品（成都）有限公司 | Thermal control method and device for chip burn-in test |
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|---|---|
| CN108089101B (en) | 2018-11-09 |
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