CN108375607A - The method and system of oilpaper part micro-water content in a kind of measurement condenser bushing - Google Patents
The method and system of oilpaper part micro-water content in a kind of measurement condenser bushing Download PDFInfo
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- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
This application discloses a kind of method and system of oilpaper part micro-water content in measurement condenser bushing, the value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation are obtained first, and, the value of capacitance of bushing and the value of insulation resistance when obtaining casing regular inspection；The value of the value of capacitance of bushing and insulation resistance when then being put into operation according to casing, and, the value of capacitance of bushing and the value of insulation resistance when casing regular inspection obtain the ratio between the ratio between capacitance of bushing and insulation resistance；Casing oilpaper is obtained later to make moist function；Finally according to make moist the ratio between the ratio between function, capacitance of bushing and insulation resistance, casing micro-water content is determined.The method for not using disintegration in the application, can exclude disintegrate in secondary pollution caused by excessive water content the case where so that judge that the method for casing state of insulation is more accurate according to casing micro-water content.
Description
Technical field
This application involves oilpaper parts in analysis and survey control technology field more particularly to a kind of measurement condenser bushing
The method and system of micro-water content.
Background technology
Condenser bushing be using oilpaper and gummed paper as primary insulation, and with capacitor voltage equalizing pole plate come uniformly radial and axial electricity
The composite insulating material casing of field distribution.
According to statistics, mainly there are humidified insulation, manufacturing process defect, oil leak and insulation the reason of condenser bushing failure
Aging etc., wherein failure rate very little caused by being discharged due to external insulator flashover, it is several compared with the failure caused by the major insulation system
It can be ignored；And in the fault type that major insulation occurs, the accident position caused by humidified insulation is according to forefront.Although insulation
The failure and exception of casing caused by making moist, not necessarily constitute accident, if but abnormal conditions be unable to timely processing, also result in
Very serious consequence.
Currently, the detection method for inside pipe casing state of insulation can be divided into two major classes：One kind is the inspection for material
It surveys, such as Wei Shui, oily resistivity and oily dielectric constant properties in oil chromatography, oil；One kind is the detection for casing univers parameter,
Such as dielectric loss, capacitance and insulation resistance.Although theoretically the univers parameter of casing can join according to design data and material
Number is calculated, and is also to provide casing univers parameter in this way when sleeve design, but due to equipment run unit
Lack necessary design parameter, causes practical O＆M unit that can only do qualitative analysis, while casing manufacturing firm is due to that can not obtain
The parameter in real material O＆M is taken, therefore it is special to carry out influence of the aging characteristics of material in operation to casing univers parameter
Journal of Sex Research.Further, since insulating paper can not sample in the casing of operation, therefore oil can only be examined in material parameter detection
Analysis is surveyed, however the paper oil insulation material in casing between two capacitance plates is only the crucial portion to univers parameter analysis the most
Point, the state of insulation of this part directly determines the operating status of casing.But insulated with material state is different to univers parameter
The rule of influence be not also very clear, such as 138kV bushings failure together of Britain in 2013, moisture in paper insulation after dissection
Test result is 3.5%, and considerably beyond the 1% of permission, but dielectric loss test result is 0.56%, is less than threshold limit value
0.7%, quantitative consistency is lacked between testing standard, while this micro-water content obtained that disintegrates can not exclude in disintegration
Secondary pollution caused by excessive water content, and then cause casing state of insulation judge ambiguity, be unfavorable for production run unit
Judgement to casing state.
Invention content
This application provides a kind of method and system of oilpaper part micro-water content in measurement condenser bushing, to solve mesh
The preceding problem that casing state of insulation inaccuracy is judged according to casing micro-water content.
On the one hand, this application provides a kind of methods of oilpaper part micro-water content in measurement condenser bushing, including：
The value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation are obtained, and, casing electricity when obtaining casing regular inspection
The value of appearance and the value of insulation resistance；
The value of the value of capacitance of bushing and insulation resistance when being put into operation according to casing, and, the value of capacitance of bushing when casing regular inspection
With the value of insulation resistance, the ratio between the ratio between capacitance of bushing and insulation resistance are obtained；
Casing oilpaper is obtained to make moist function；
According to the ratio between the ratio between the function that makes moist, described sleeve pipe capacitance and described insulation resistance, casing micro-water content is determined.
Optionally, the value of capacitance of bushing when being put into operation according to casing and the value of insulation resistance, and, when casing regular inspection, covers
The value of pipe capacitance and the value of insulation resistance, the step of obtaining the ratio between the ratio between capacitance of bushing and insulation resistance include：
When being put into operation according to described sleeve pipe the value of capacitance of bushing and when described sleeve pipe regular inspection capacitance of bushing value, obtain casing electricity
The ratio between hold；
When being put into operation according to described sleeve pipe the value of insulation resistance and when described sleeve pipe regular inspection insulation resistance value, obtain insulated electro
The ratio between resistance.
Optionally, make moist the ratio between the ratio between function, described sleeve pipe capacitance and described insulation resistance described in the basis, determines set
The step of pipe micro-water content includes：
According to the ratio between the ratio between described sleeve pipe capacitance and the insulation resistance, determine casing oilpaper change in dielectric constant rate and
Oilpaper resistance change rate；
According to the function that makes moist, the oilpaper change in dielectric constant rate and the oilpaper resistance change rate, casing is determined
Micro-water content.
Optionally, it makes moist described in the basis function, the oilpaper change in dielectric constant rate and the oilpaper resistance variations
Rate, the step of determining casing micro-water content include：
According to make moist function and the oilpaper change in dielectric constant rate, the micro- water for obtaining oilpaper part for the first time contains
Amount；
According to make moist function and the oilpaper resistance change rate, second of micro-water content for obtaining oilpaper part；
The micro-water content and second of acquisition micro-water content obtained according to first time, determines casing micro-water content.
Optionally, the micro-water content obtained according to first time and second of acquisition micro-water content, determine the micro- water of casing
In the step of content, determine that the specific steps of casing micro-water content include：
The weighted average of the micro-water content obtained twice is calculated, the weighted average is casing micro-water content.
On the other hand, the application provides a kind of system measuring oilpaper part micro-water content in condenser bushing, including：
First acquisition unit, the value for obtaining the value of capacitance of bushing and insulation resistance when casing newly puts into operation, and, it obtains
The value of the value of capacitance of bushing and insulation resistance when casing regular inspection；
First computing unit, the value of the value of capacitance of bushing and insulation resistance when for being put into operation according to casing, and, casing is fixed
The value of the value of capacitance of bushing and insulation resistance when inspection obtains the ratio between the ratio between capacitance of bushing and insulation resistance；
Second acquisition unit makes moist function for obtaining casing oilpaper；
Second computing unit, for making moist the ratio between the ratio between function, described sleeve pipe capacitance and described insulation resistance according to,
Determine casing micro-water content.
Optionally, first computing unit includes：
Capacitance computing unit, the value of capacitance of bushing and casing electricity when described sleeve pipe regular inspection when for being put into operation according to described sleeve pipe
The value of appearance obtains the ratio between capacitance of bushing；
Resistance calculations unit, the value of insulation resistance and insulated electro when described sleeve pipe regular inspection when for being put into operation according to described sleeve pipe
The value of resistance obtains the ratio between insulation resistance.
Optionally, the second acquisition unit includes：
Change rate acquiring unit, for according to the ratio between the ratio between described sleeve pipe capacitance and the insulation resistance, determining casing
Oilpaper change in dielectric constant rate and oilpaper resistance change rate；
Content determination unit, for the function that makes moist according to, the oilpaper change in dielectric constant rate and oilpaper electricity
Resistive rate determines casing micro-water content.
Optionally, the content determination unit includes：
Third computing unit obtains for the first time for function and the oilpaper change in dielectric constant rate of making moist according to
The micro-water content of oilpaper part；
4th computing unit, for function and the oilpaper resistance change rate of making moist according to, second of acquisition oilpaper
Partial micro-water content；
5th computing unit, the micro-water content for being obtained according to first time obtain micro-water content with second, determine set
Pipe micro-water content.
By above technical scheme it is found that the application provides a kind of side measuring oilpaper part micro-water content in condenser bushing
Method and system obtain the value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation first, and, it is covered when obtaining casing regular inspection
The value of pipe capacitance and the value of insulation resistance；The value of the value of capacitance of bushing and insulation resistance when then being put into operation according to casing, and, set
The value of the value of capacitance of bushing and insulation resistance when pipe regular inspection obtains the ratio between the ratio between capacitance of bushing and insulation resistance；Set is obtained later
Pipe oilpaper makes moist function；Finally according to make moist the ratio between the ratio between function, capacitance of bushing and insulation resistance, casing micro-water content is determined.
The method for not using disintegration in the application, can exclude disintegrate in secondary pollution caused by excessive water content the case where so that root
Judge that the method for casing state of insulation is more accurate according to casing micro-water content.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, attached drawing needed in case study on implementation will be made below
Simply introduce, it should be apparent that, for those of ordinary skills, in the premise of not making the creative labor property
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of method flow measuring oilpaper part micro-water content in condenser bushing provided by the embodiments of the present application
Figure；
Fig. 2 is another method stream for measuring oilpaper part micro-water content in condenser bushing provided by the embodiments of the present application
Cheng Tu；
Fig. 3 is variation relation figure of the embodiment of the present application middle sleeve capacitance with the change in dielectric constant of insulating oil；
Fig. 4 is variation relation figure of the embodiment of the present application middle sleeve insulation resistance with the change in dielectric constant of insulating paper；
Fig. 5 is a kind of system structure measuring oilpaper part micro-water content in condenser bushing provided by the embodiments of the present application
Figure；
Fig. 6 is the structure chart of the first computing unit provided by the embodiments of the present application；
Fig. 7 is the structure chart of second acquisition unit provided by the embodiments of the present application；
Fig. 8 is the structure chart of content determination unit provided by the embodiments of the present application.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with attached drawing, it is right
Technical solution in the embodiment of the present application is clearly and completely described.
Referring to Fig. 1, the embodiment of the present application provides a kind of method measuring oilpaper part micro-water content in condenser bushing, packet
It includes：
Step 101, the value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation are obtained, and, obtain casing regular inspection
When the value of the capacitance of bushing and value of insulation resistance.Casing when newly putting into operation generally all is not in Insulation Problems, and the application is wanted
What is solved is Insulation monitoring problem of the casing after running a period of time, so casing state when regular inspection, which is casing, runs one section
State after time at this time detects the micro-water content in casing, contributes to the state of insulation for detecting casing.Time between predetermined repairs can root
It is formulated according to specific requirements, the capacitance of bushing and insulation resistance obtained twice is different, for example, casing electricity when casing newly puts into operation
It is C' to holdSUM, insulation resistance R'SUM, and capacitance of bushing is C " when regular inspectionSUM, insulation resistance R "SUM。
Step 102, the value of the value of capacitance of bushing and insulation resistance when being put into operation according to casing, and, casing when casing regular inspection
The value of capacitance and the value of insulation resistance obtain the ratio between capacitance of bushingThe ratio between with insulation resistance
Step 103, casing oilpaper is obtained to make moist function.The function that makes moist in the application is a curve, but specific
Curve form is uncertain, needs to be measured and used according to specific situation.
Step 104, according to the ratio between the ratio between the function that makes moist, capacitance of bushing and insulation resistance, casing micro-water content is determined.
The method for not using disintegration in the application can exclude the feelings of excessive water content caused by the secondary pollution in disintegrating
Condition so that judge that the method for casing state of insulation is more accurate according to casing micro-water content.
Referring to Fig. 2, the embodiment of the present application provides another method for measuring oilpaper part micro-water content in condenser bushing,
Including：
Step 201, the value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation are obtained, and, obtain casing regular inspection
When the value of the capacitance of bushing and value of insulation resistance.Same above-described embodiment, capacitance of bushing is C' when the casing measured newly puts into operationSUM, absolutely
Edge resistance is R'SUM, and capacitance of bushing is C " when regular inspectionSUM, insulation resistance R "SUM。
Step 202, when being put into operation according to casing the value of capacitance of bushing and when casing regular inspection capacitance of bushing value, obtain casing electricity
The ratio between hold
Step 203, when being put into operation according to casing the value of insulation resistance and when casing regular inspection insulation resistance value, obtain insulated electro
The ratio between resistance
Step 204, casing oilpaper is obtained to make moist function.
Step 205, according to the ratio between the ratio between capacitance of bushing and insulation resistance, the oilpaper change in dielectric constant rate δ of casing is determinedε
With oilpaper resistance change rate δρ.Specific calculating process is as follows：
Capacitance is the linear function of dielectric constant, and therefore, capacitance can be expressed as：
C=ε0εrF (r),
Wherein, ε0For permittivity of vacuum, εrFor relative dielectric constant, f (r) is structure dependent function, is defined as
Capacitance structure function, the structure function do not change in structure as steady state value.Capacitance of bushing CSUMIt can be with approximate representation for pure oil
Capacitance CoilWith oilpaper capacitance CpaperThe parallel connection of two parts capacitance：
CSUM=Coil+Cpaper
Wherein,
Coil=ε0εoilfoil(r)
Cpaper=ε0εpaperfpaper(r)
So
CSUM=ε0εoilfoil(r)+ε0εpaperfpaper(r)。
Referring to Fig. 3 and Fig. 4, the relative dielectric constant of wherein insulating oil is pure oily relative dielectric constant, the phase of insulating paper
It is oilpaper relative dielectric constant to dielectric constant, it follows that capacitance of bushing CSUMHardly by pure oily relative dielectric constant
εoilInfluence, this illustrates foil(r) 0 ≈, therefore,
CSUM≈ε0εpaperfpaper(r)
Casing capacitance of bushing amount in new put into operation is expressed as：
C'SUM≈ε0ε'paperfpaper(r)
Capacitance of bushing amount of the casing in regular inspection is to be expressed as：
C”SUM=ε0ε”paperfpaper(r)
It can obtain,
Similar to the capacitance characteristic of casing, insulation resistance is also the linear function of resistivity, and therefore, insulation resistance can be with table
State for：
R=ρ g (r),
Wherein, it is structure dependent function that ρ, which is resistivity, g (r), is similar to the structure function of capacitance, and g (r) is defined as
Insulation resistance structure function, similarly structure function do not change as steady state value in structure.For the insulation resistance R of casingSUM
It can be with approximate representation for pure oil-insulation resistance RoilWith paper oil insulation resistance RpaperThe parallel connection of two parts insulation resistance：
RSUM=Roil+Rpaper
Wherein,
Roil=ρoilgoil(r)
Rpaper=ρpapergpaper(r)
So
RSUM=ρoilgoil(r)+ρpapergpaper(r)。
According to following Tables 1 and 2, it is known that the insulation resistance of casing mainly by the resistivity effects of oilpaper part, compares it
Under can be approximately considered goil(r) 0 ≈, i.e.,
RSUM≈ρpapergpaper(r)
Casing insulation resistance in new put into operation：
R'SUM≈ρ'papergpaper(r)
Insulation resistance when casing regular inspection is：
R”paper≈ρ”papergpaper(r)
It can obtain,
The variation relation of 1 insulation resistance of table and the pure oily resistivity of casing
The variation relation of 2 insulation resistance of table and casing oilpaper resistivity
Step 206, according to function and the oilpaper change in dielectric constant rate of making moist, the micro-water content of oilpaper part is obtained for the first time
MCε。
Step 207, according to function and the oilpaper resistance change rate of making moist, second of micro-water content MC for obtaining oilpaper partρ。
Step 208, the micro-water content obtained according to first time obtains micro-water content with second, determines casing micro-water content
MC。
Specifically, determining that the specific steps of casing micro-water content include：
The weighted average of the micro-water content obtained twice is calculated, the weighted average is casing micro-water content, tool
Body calculation is as follows：
MC=fε·MCε+fρ·MCρ
Wherein, fεAnd fρThe respectively weight function of dielectric constant and resistivity factor, wherein fεValue is [0.5,1], fρIt takes
Value is [0,0.5], and fε+fρ=1.In the embodiment of the present application, work as fεAnd fρWhen meeting value condition respectively, any one group makes
Obtain fε+fρ=1 f set upεAnd fρIt can bring into above formula and calculate, to obtain the content of micro- water in casing.Do not destroying set
The micro-water content that oilpaper part in casing is determined in the case of pipe, basis for estimation is provided for the state of insulation of casing.
By above technical scheme it is found that the application provides a kind of side measuring oilpaper part micro-water content in condenser bushing
Method obtains the value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation first, and, capacitance of bushing when obtaining casing regular inspection
Value and insulation resistance value；The value of the value of capacitance of bushing and insulation resistance when then being put into operation according to casing, and, casing regular inspection
When the value of the capacitance of bushing and value of insulation resistance, obtain the ratio between the ratio between capacitance of bushing and insulation resistance；Casing oilpaper is obtained later
Make moist function；Finally according to make moist the ratio between the ratio between function, capacitance of bushing and insulation resistance, casing micro-water content is determined.The application
In the case where not using the method for disintegration, excessive water content caused by the secondary pollution in disintegrating can be excluded so that according to casing
Micro-water content judges that the method for casing state of insulation is more accurate.
Referring to Fig. 5, the embodiment of the present application provides a kind of system measuring oilpaper part micro-water content in condenser bushing, packet
It includes：
First acquisition unit 501, the value for obtaining the value of capacitance of bushing and insulation resistance when casing newly puts into operation, and,
The value of capacitance of bushing and the value of insulation resistance when obtaining casing regular inspection；
First computing unit 502, the value of the value of capacitance of bushing and insulation resistance when for being put into operation according to casing, and, set
The value of the value of capacitance of bushing and insulation resistance when pipe regular inspection obtains the ratio between the ratio between capacitance of bushing and insulation resistance；
Second acquisition unit 503 makes moist function for obtaining casing oilpaper；
Second computing unit 504, for according to make moist the ratio between the ratio between function, capacitance of bushing and insulation resistance, determining casing
Micro-water content.
Optionally, referring to Fig. 6, the first computing unit 502 includes：
Capacitance computing unit 601, the value of capacitance of bushing and capacitance of bushing when casing regular inspection when for being put into operation according to casing
Value obtains the ratio between capacitance of bushing；
Resistance calculations unit 602, the value of insulation resistance and insulation resistance when casing regular inspection when for being put into operation according to casing
Value obtains the ratio between insulation resistance.
Optionally, referring to Fig. 7, second acquisition unit 503 includes：
Change rate acquiring unit 701, for according to the ratio between the ratio between capacitance of bushing and insulation resistance, determining that the oilpaper of casing is situated between
Electric constant change rate and oilpaper resistance change rate；
Content determination unit 702, for according to making moist function, oilpaper change in dielectric constant rate and oilpaper resistance change rate,
Determine casing micro-water content.
Optionally, referring to Fig. 8, content determination unit 702 includes：
Third computing unit 801, for according to make moist function and oilpaper change in dielectric constant rate, obtaining oilpaper portion for the first time
The micro-water content divided；
4th computing unit 802, for according to make moist function and oilpaper resistance change rate, obtaining oilpaper part for the second time
Micro-water content；
5th computing unit 803, the micro-water content for being obtained according to first time obtain micro-water content with second, determine
Casing micro-water content.
By above technical scheme it is found that the application provides a kind of side measuring oilpaper part micro-water content in condenser bushing
Method and system obtain the value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation first, and, it is covered when obtaining casing regular inspection
The value of pipe capacitance and the value of insulation resistance；The value of the value of capacitance of bushing and insulation resistance when then being put into operation according to casing, and, set
The value of the value of capacitance of bushing and insulation resistance when pipe regular inspection obtains the ratio between the ratio between capacitance of bushing and insulation resistance；Set is obtained later
Pipe oilpaper makes moist function；Finally according to make moist the ratio between the ratio between function, capacitance of bushing and insulation resistance, casing micro-water content is determined.
The method for not using disintegration in the application, can exclude disintegrate in secondary pollution caused by excessive water content the case where so that root
Judge that the method for casing state of insulation is more accurate according to casing micro-water content.
Those skilled in the art will readily occur to its of the application after considering specification and putting into practice application disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and includes the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope of the application is pointed out by claim.
It should be understood that the application is not limited to the precision architecture for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.Above-described the application embodiment is not constituted to this Shen
Please protection domain restriction.
Claims (9)
1. a kind of method measuring oilpaper part micro-water content in condenser bushing, which is characterized in that including：
The value of capacitance of bushing and the value of insulation resistance when casing newly puts into operation are obtained, and, capacitance of bushing when obtaining casing regular inspection
The value of value and insulation resistance；
The value of the value of capacitance of bushing and insulation resistance when being put into operation according to casing, and, the value of capacitance of bushing and absolutely when casing regular inspection
The value of edge resistance obtains the ratio between the ratio between capacitance of bushing and insulation resistance；
Casing oilpaper is obtained to make moist function；
According to the ratio between the ratio between the function that makes moist, described sleeve pipe capacitance and described insulation resistance, casing micro-water content is determined.
2. according to the method described in claim 1, it is characterized in that, value and the insulation of capacitance of bushing when being put into operation according to casing
The value of resistance, and, the value of capacitance of bushing and the value of insulation resistance when casing regular inspection obtain the ratio between capacitance of bushing and insulation resistance
The ratio between the step of include：
When being put into operation according to described sleeve pipe the value of capacitance of bushing and when described sleeve pipe regular inspection capacitance of bushing value, obtain capacitance of bushing it
Than；
When being put into operation according to described sleeve pipe the value of insulation resistance and when described sleeve pipe regular inspection insulation resistance value, obtain insulation resistance it
Than.
3. according to the method described in claim 1, it is characterized in that, the function that makes moist described in the basis, described sleeve pipe capacitance it
Include than the step of the ratio between with the insulation resistance, determining casing micro-water content：
According to the ratio between the ratio between described sleeve pipe capacitance and the insulation resistance, the oilpaper change in dielectric constant rate and oilpaper of casing are determined
Resistance change rate；
According to the function that makes moist, the oilpaper change in dielectric constant rate and the oilpaper resistance change rate, the micro- water of casing is determined
Content.
4. according to the method described in claim 3, it is characterized in that, the function that makes moist described in the basis, the oilpaper dielectric are normal
The number change rates and oilpaper resistance change rate, the step of determining casing micro-water content include：
According to make moist function and the oilpaper change in dielectric constant rate, the micro-water content of oilpaper part is obtained for the first time；
According to make moist function and the oilpaper resistance change rate, second of micro-water content for obtaining oilpaper part；
The micro-water content and second of acquisition micro-water content obtained according to first time, determines casing micro-water content.
5. according to the method described in claim 4, it is characterized in that, the micro-water content obtained according to first time and second
In the step of obtaining micro-water content, determining casing micro-water content, determine that the specific steps of casing micro-water content include：
The weighted average of the micro-water content obtained twice is calculated, the weighted average is casing micro-water content.
6. a kind of system measuring oilpaper part micro-water content in condenser bushing, which is characterized in that including：
First acquisition unit, the value for obtaining the value of capacitance of bushing and insulation resistance when casing newly puts into operation, and, obtain casing
The value of the value of capacitance of bushing and insulation resistance when regular inspection；
First computing unit, the value of the value of capacitance of bushing and insulation resistance when for being put into operation according to casing, and, when casing regular inspection
The value of capacitance of bushing and the value of insulation resistance obtain the ratio between the ratio between capacitance of bushing and insulation resistance；
Second acquisition unit makes moist function for obtaining casing oilpaper；
Second computing unit is determined for the ratio between the ratio between function, described sleeve pipe capacitance and the described insulation resistance of making moist according to
Casing micro-water content.
7. system according to claim 6, which is characterized in that first computing unit includes：
Capacitance computing unit, the value of capacitance of bushing and capacitance of bushing when described sleeve pipe regular inspection when for being put into operation according to described sleeve pipe
Value obtains the ratio between capacitance of bushing；
Resistance calculations unit, the value of insulation resistance and insulation resistance when described sleeve pipe regular inspection when for being put into operation according to described sleeve pipe
Value obtains the ratio between insulation resistance.
8. system according to claim 6, which is characterized in that the second acquisition unit includes：
Change rate acquiring unit, for according to the ratio between the ratio between described sleeve pipe capacitance and the insulation resistance, determining the oilpaper of casing
Change in dielectric constant rate and oilpaper resistance change rate；
Content determination unit becomes for make moist according to function, the oilpaper change in dielectric constant rate and the oilpaper resistance
Rate determines casing micro-water content.
9. system according to claim 8, which is characterized in that the content determination unit includes：
Third computing unit obtains oilpaper for the first time for function and the oilpaper change in dielectric constant rate of making moist according to
Partial micro-water content；
4th computing unit, for function and the oilpaper resistance change rate of making moist according to, second of acquisition oilpaper part
Micro-water content；
5th computing unit, the micro-water content for being obtained according to first time obtain micro-water content with second, determine that casing is micro-
Water content.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030199A (en) * | 2021-04-14 | 2021-06-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve simulated wetting test device and method |
| CN113406462A (en) * | 2021-06-17 | 2021-09-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
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| CN113030199A (en) * | 2021-04-14 | 2021-06-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve simulated wetting test device and method |
| CN113406462A (en) * | 2021-06-17 | 2021-09-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
| CN113406462B (en) * | 2021-06-17 | 2022-08-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Epoxy glue impregnated paper sleeve pipe damp defect simulation method and preparation method |
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