CN108375607B - Method and system for measuring micro-water content of oil paper part in capacitive bushing - Google Patents
Method and system for measuring micro-water content of oil paper part in capacitive bushing Download PDFInfo
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Abstract
The application discloses a method and a system for measuring the micro-water content of an oil paper part in a capacitive bushing, wherein the method comprises the steps of firstly obtaining the value of the bushing capacitance and the value of the insulation resistance when the bushing is put into operation newly, and obtaining the value of the bushing capacitance and the value of the insulation resistance when the bushing is inspected regularly; then obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is subjected to regular inspection; then acquiring a sleeve oilpaper damping function; and finally, determining the micro-water content of the sleeve according to the damp function, the ratio of the sleeve capacitance and the ratio of the insulation resistance. According to the method, a disintegration method is not adopted, the condition that micro-water exceeds the standard caused by secondary pollution in the disintegration can be eliminated, and the method for judging the insulation state of the sleeve according to the micro-water content of the sleeve is more accurate.
Description
Technical Field
The application relates to the technical field of analysis and measurement control, in particular to a method and a system for measuring the micro-water content of an oil paper part in a capacitive bushing.
Background
The capacitive bushing is a composite insulating material bushing which takes oilpaper and gummed paper as main insulation and uses a capacitance voltage-sharing polar plate to uniformly distribute a radial electric field and an axial electric field.
According to statistics, the fault of the capacitive bushing mainly comprises insulation moisture, manufacturing process defects, oil leakage, insulation aging and the like, wherein the fault rate caused by flashover discharge of an external porcelain bushing is very low, and the fault rate can be almost ignored compared with the fault caused by a main insulation system; and in the fault type of the main insulation, the fault caused by the insulation moisture is in the front. Although the failure and abnormality of the bushing caused by the insulation moisture does not necessarily constitute an accident, the abnormal condition can also cause very serious consequences if the abnormal condition cannot be handled in time.
At present, the detection methods for the insulation state inside the casing can be divided into two categories: one is detection of materials such as oil chromatography, water in oil, oil resistivity, and dielectric constant properties of oil; one is the detection of the overall parameters of the bushing, such as dielectric loss, capacitance and insulation resistance. Although theoretically, the overall parameters of the casing can be calculated according to the design data and the material parameters, and the overall parameters of the casing are also given in the way during the casing design, the actual operation and maintenance unit can only perform qualitative analysis due to the lack of necessary design parameters in the equipment operation unit, and meanwhile, the casing manufacturer cannot research the influence characteristics of the aging characteristics of the running materials on the overall parameters of the casing because the parameters in the actual material operation and maintenance cannot be obtained. In addition, because the insulating paper in the running bushing cannot be sampled, only detection and analysis can be carried out on oil in material parameter detection, but the oil paper insulating material between two capacitive screens in the bushing is the most critical part for overall parameter analysis, and the insulating state of the part directly determines the running state of the bushing. However, the rule of influence of insulation states of different materials on overall parameters is not clear, for example, in 2013, when a 138kV high-voltage bushing fails in the uk, the test result of moisture in paper insulation after dissection is 3.5%, which is far more than 1% of the allowable value, but the test result of dielectric loss is 0.56%, which is less than 0.7% of the maximum allowable value, quantitative consistency is lacked between test standards, and meanwhile, the content of micro-water obtained by disintegration cannot exclude the exceeding of micro-water caused by secondary pollution in disintegration, thereby causing ambiguity of bushing insulation state judgment, and being not beneficial to the judgment of a production operation unit on the bushing state.
Disclosure of Invention
The application provides a method and a system for measuring the micro-water content of an oil paper part in a capacitive bushing, which aim to solve the problem that the insulation state of the bushing is not accurate according to the micro-water content of the bushing at present.
In one aspect, the present application provides a method for measuring the moisture content of the oil paper portion in a capacitive bushing, including:
acquiring a value of the sleeve capacitor and a value of the insulation resistance when the sleeve is put into operation newly, and acquiring a value of the sleeve capacitor and a value of the insulation resistance when the sleeve is checked regularly;
obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is subjected to regular inspection;
acquiring a sleeve oilpaper damping function;
and determining the micro-water content of the sleeve according to the moisture function, the ratio of the sleeve capacitance and the ratio of the insulation resistance.
Optionally, the step of obtaining the ratio of the casing capacitance to the insulation resistance according to the casing capacitance and the insulation resistance when the casing is put into operation, and the casing capacitance and the insulation resistance when the casing is checked regularly includes:
obtaining a ratio of the casing capacitance according to the casing capacitance value during the casing commissioning and the casing capacitance value during the casing regular inspection;
and obtaining the ratio of the insulation resistances according to the value of the insulation resistance when the sleeve is put into operation and the value of the insulation resistance when the sleeve is subjected to regular inspection.
Optionally, the step of determining the micro-water content of the bushing according to the damping function, the ratio of the bushing capacitances and the ratio of the insulation resistances comprises:
determining the oiled paper dielectric constant change rate and the oiled paper resistance change rate of the sleeve according to the ratio of the sleeve capacitance to the ratio of the insulation resistance;
and determining the micro-water content of the casing according to the wetting function, the change rate of the dielectric constant of the oilpaper and the change rate of the resistance of the oilpaper.
Optionally, the step of determining the micro-water content of the casing according to the wetting function, the change rate of the dielectric constant of the oiled paper and the change rate of the electrical resistance of the oiled paper comprises:
obtaining the micro-water content of the oiled paper part for the first time according to the moisture function and the change rate of the dielectric constant of the oiled paper;
obtaining the micro-water content of the oilpaper part for the second time according to the moisture function and the oilpaper resistance change rate;
and determining the micro-water content of the sleeve according to the micro-water content obtained for the first time and the micro-water content obtained for the second time.
Optionally, in the step of determining the micro water content of the casing according to the micro water content obtained for the first time and the micro water content obtained for the second time, the specific step of determining the micro water content of the casing includes:
and calculating the weighted average value of the micro-water content obtained twice, wherein the weighted average value is the micro-water content of the casing.
In another aspect, the present application provides a system for measuring the moisture content of a portion of oil paper in a capacitive bushing, comprising:
the first acquisition unit is used for acquiring the value of the sleeve capacitor and the value of the insulation resistance when the sleeve is put into operation newly, and acquiring the value of the sleeve capacitor and the value of the insulation resistance when the sleeve is checked regularly;
the first calculation unit is used for obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is checked regularly;
the second acquisition unit is used for acquiring a sleeve oilpaper damping function;
and the second calculation unit is used for determining the micro-water content of the sleeve according to the damping function, the ratio of the sleeve capacitance and the ratio of the insulation resistance.
Optionally, the first computing unit includes:
the capacitance calculation unit is used for obtaining the ratio of the sleeve capacitance according to the value of the sleeve capacitance when the sleeve is put into operation and the value of the sleeve capacitance when the sleeve is subjected to regular inspection;
and the resistance calculation unit is used for obtaining the ratio of the insulation resistances according to the value of the insulation resistance when the sleeve is put into operation and the value of the insulation resistance when the sleeve is subjected to regular inspection.
Optionally, the second obtaining unit includes:
the change rate obtaining unit is used for determining the change rate of the oiled paper dielectric constant and the change rate of the oiled paper resistance of the sleeve according to the ratio of the sleeve capacitance and the ratio of the insulation resistance;
and the content determining unit is used for determining the micro-water content of the sleeve according to the wetting function, the change rate of the dielectric constant of the oilpaper and the change rate of the resistance of the oilpaper.
Optionally, the content determining unit includes:
the third calculation unit is used for obtaining the micro-water content of the oiled paper part for the first time according to the moisture function and the change rate of the dielectric constant of the oiled paper;
the fourth calculation unit is used for obtaining the micro-water content of the oiled paper part for the second time according to the wetting function and the oiled paper resistance change rate;
and the fifth calculation unit is used for determining the micro-water content of the sleeve according to the micro-water content obtained for the first time and the micro-water content obtained for the second time.
According to the technical scheme, the method and the system for measuring the micro-water content of the oil paper part in the capacitive bushing are provided, and the method and the system firstly obtain the capacitance value and the insulation resistance value of the bushing when the bushing is put into operation newly, and obtain the capacitance value and the insulation resistance value of the bushing when the bushing is checked regularly; then obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is subjected to regular inspection; then acquiring a sleeve oilpaper damping function; and finally, determining the micro-water content of the sleeve according to the damp function, the ratio of the sleeve capacitance and the ratio of the insulation resistance. According to the method, a disintegration method is not adopted, the condition that micro-water exceeds the standard caused by secondary pollution in the disintegration can be eliminated, and the method for judging the insulation state of the sleeve according to the micro-water content of the sleeve is more accurate.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a flowchart of a method for measuring a moisture content of an oil-paper portion in a capacitive bushing according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of another method for measuring the moisture content of the oil-paper portion in the capacitive bushing according to an embodiment of the present disclosure;
FIG. 3 is a graph showing the variation of the bushing capacitance with the dielectric constant of the insulating oil according to the embodiment of the present application;
FIG. 4 is a graph showing the variation of the insulation resistance of the bushing with the dielectric constant of the insulation paper in the embodiment of the present application;
FIG. 5 is a diagram of a system for measuring the moisture content of the oil-paper portion in the capacitive bushing according to an embodiment of the present disclosure;
fig. 6 is a block diagram of a first computing unit according to an embodiment of the present disclosure;
fig. 7 is a structural diagram of a second obtaining unit provided in the embodiment of the present application;
fig. 8 is a structural diagram of a content determination unit provided in an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present application provides a method for measuring a moisture content of an oil paper portion in a capacitive bushing, including:
102, obtaining the ratio of the sleeve capacitance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is checked regularly
Ratio of insulation resistance
And 103, acquiring a sleeve oilpaper damping function. The wetting function in this application is a curve, but the specific form of the curve is uncertain and needs to be determined and used according to specific situations.
And step 104, determining the micro-water content of the sleeve according to the wetting function, the ratio of the sleeve capacitance and the ratio of the insulation resistance.
According to the method, a disintegration method is not adopted, the condition that micro-water exceeds the standard caused by secondary pollution in the disintegration can be eliminated, and the method for judging the insulation state of the sleeve according to the micro-water content of the sleeve is more accurate.
Referring to fig. 2, another method for measuring the moisture content of the oilpaper portion of the capacitive bushing is provided in the embodiments of the present application, including:
And step 204, acquiring a sleeve oilpaper damping function.
capacitance is a linear function of dielectric constant, and thus, capacitance can be expressed as:
C＝ε0εrf(r)，
wherein epsilon0Is a vacuum dielectric constant,. epsilonrIs the relative dielectric constant and f (r) is a structure-dependent function, defined as the capacitive structure function, which does not change to a constant value in the structure. Bushing capacitance CSUMCan be approximately expressed as a pure oil capacitance CoilOiled paper capacitor CpaperThe parallel connection of two part capacitances:
CSUM＝Coil+Cpaper
wherein the content of the first and second substances,
Coil＝ε0εoilfoil(r)
Cpaper＝ε0εpaperfpaper(r)
therefore, the first and second electrodes are formed on the substrate,
CSUM＝ε0εoilfoil(r)+ε0εpaperfpaper(r)。
referring to fig. 3 and 4, the relative dielectric constant of the insulating oil is the relative dielectric constant of pure oil, and the relative dielectric constant of the insulating paper is the relative dielectric constant of oiled paper, so that the bushing capacitance C is obtainedSUMHardly influenced by the relative dielectric constant epsilon of pure oiloilThis indicates the effect of foil(r) ≈ 0, and therefore,
CSUM≈ε0εpaperfpaper(r)
the bushing capacitance when the bushing is put into operation is expressed as:
C'SUM≈ε0ε'paperfpaper(r)
the bushing capacitance of the bushing at the time of the regular inspection is expressed as:
C”SUM＝ε0ε”paperfpaper(r)
it is possible to obtain,
similar to the capacitive characteristics of the bushing, the insulation resistance is also a linear function of the resistivity, and therefore, the insulation resistance can be expressed as:
R＝ρg(r)，
where ρ is the resistivity, g (r) is a structure-related function, similar to the structure function of capacitance, and g (r) is defined as the structure function of insulation resistance, which likewise changes to a constant value in the structure. Insulation resistance R for bushingSUMCan also be approximately expressed as the pure oil insulation resistance RoilAnd oiled paper insulation resistance RpaperThe parallel connection of two parts of insulation resistors:
RSUM＝Roil+Rpaper
wherein the content of the first and second substances,
Roil＝ρoilgoil(r)
Rpaper＝ρpapergpaper(r)
therefore, the first and second electrodes are formed on the substrate,
RSUM＝ρoilgoil(r)+ρpapergpaper(r)。
from the following tables 1 and 2, it is understood that the insulation resistance of the bushing is mainly affected by the resistivity of the oiled paper portion, compared to approximately consider goil(r) is approximately equal to 0, i.e.
RSUM≈ρpapergpaper(r)
Insulation resistance of the bushing when newly put into operation:
R'SUM≈ρ'papergpaper(r)
the insulation resistance when the sleeve pipe is examined regularly is:
R”paper≈ρ”papergpaper(r)
it is possible to obtain,
TABLE 1 relationship between insulation resistance and resistivity of casing pure oil
TABLE 2 relationship between insulation resistance and resistivity of casing oiled paper
And step 208, determining the micro-water content MC of the sleeve according to the micro-water content obtained for the first time and the micro-water content obtained for the second time.
Specifically, the specific steps for determining the micro-water content of the casing comprise:
calculating the weighted average value of the micro-water content obtained twice, wherein the weighted average value is the micro-water content of the casing, and the specific calculation mode is as follows:
MC＝fε·MCε+fρ·MCρ
wherein f isεAnd fρAre weight functions of dielectric constant and resistivity factors, respectively, where fεValue of [0.5,1]、fρValue of [0,0.5 ]]And f isε+fρ1. In the examples of this application, when fεAnd fρWhen the values respectively satisfy the value-taking conditions, any one group makes fε+fρF being true for 1εAnd fρThe calculation can be carried out by the formula to obtain the micro water content in the casing. The micro-water content of the oiled paper part in the casing is determined under the condition that the casing is not damaged, and a judgment basis is provided for the insulation state of the casing.
According to the technical scheme, the method for measuring the micro-water content of the oil paper part in the capacitive bushing is characterized by comprising the steps of firstly obtaining the capacitance value and the insulation resistance value of the bushing when the bushing is put into operation newly, and obtaining the capacitance value and the insulation resistance value of the bushing when the bushing is checked regularly; then obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is subjected to regular inspection; then acquiring a sleeve oilpaper damping function; and finally, determining the micro-water content of the sleeve according to the damp function, the ratio of the sleeve capacitance and the ratio of the insulation resistance. According to the method, a disintegration method is not adopted, the condition that micro-water exceeds the standard caused by secondary pollution in the disintegration can be eliminated, and the method for judging the insulation state of the sleeve according to the micro-water content of the sleeve is more accurate.
Referring to fig. 5, an embodiment of the present application provides a system for measuring a moisture content of a paper portion in a capacitive bushing, including:
a first obtaining unit 501, configured to obtain a value of a casing capacitance and a value of an insulation resistance when a casing is newly put into operation, and obtain a value of a casing capacitance and a value of an insulation resistance when a casing is subjected to regular inspection;
a first calculating unit 502, configured to obtain a ratio between the casing capacitance and the insulation resistance according to a value of the casing capacitance and a value of the insulation resistance when the casing is put into operation, and a value of the casing capacitance and a value of the insulation resistance when the casing is inspected;
a second obtaining unit 503, configured to obtain a sleeve oilpaper damping function;
and the second calculating unit 504 is used for determining the micro-water content of the sleeve according to the wetting function, the ratio of the sleeve capacitance and the ratio of the insulation resistance.
Alternatively, referring to fig. 6, the first calculation unit 502 includes:
the capacitance calculating unit 601 is used for obtaining the ratio of the casing capacitance according to the casing capacitance value during casing commissioning and the casing capacitance value during casing regular inspection;
the resistance calculation unit 602 is configured to obtain a ratio of the insulation resistances according to the value of the insulation resistance when the bushing is put into operation and the value of the insulation resistance when the bushing is subjected to the regular inspection.
Alternatively, referring to fig. 7, the second obtaining unit 503 includes:
a change rate obtaining unit 701, configured to determine a change rate of an oiled paper dielectric constant and a change rate of an oiled paper resistance of the bushing according to a ratio of the bushing capacitances and a ratio of the insulation resistances;
and the content determining unit 702 is used for determining the micro-water content of the casing according to the wetting function, the change rate of the dielectric constant of the oilpaper and the change rate of the resistance of the oilpaper.
Alternatively, referring to fig. 8, the content determining unit 702 includes:
a third calculating unit 801, configured to obtain the micro-water content of the oiled paper portion for the first time according to the moisture function and the rate of change of the dielectric constant of the oiled paper;
the fourth calculating unit 802 is configured to obtain the micro water content of the oiled paper portion for the second time according to the wetting function and the oiled paper resistance change rate;
and a fifth calculating unit 803, configured to determine the micro water content of the casing according to the micro water content obtained for the first time and the micro water content obtained for the second time.
According to the technical scheme, the method and the system for measuring the micro-water content of the oil paper part in the capacitive bushing are provided, and the method and the system firstly obtain the capacitance value and the insulation resistance value of the bushing when the bushing is put into operation newly, and obtain the capacitance value and the insulation resistance value of the bushing when the bushing is checked regularly; then obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is subjected to regular inspection; then acquiring a sleeve oilpaper damping function; and finally, determining the micro-water content of the sleeve according to the damp function, the ratio of the sleeve capacitance and the ratio of the insulation resistance. According to the method, a disintegration method is not adopted, the condition that micro-water exceeds the standard caused by secondary pollution in the disintegration can be eliminated, and the method for judging the insulation state of the sleeve according to the micro-water content of the sleeve is more accurate.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.
Claims (9)
1. A method for measuring the micro-water content of an oil paper part in a capacitive bushing is characterized by comprising the following steps:
acquiring a value of the sleeve capacitor and a value of the insulation resistance when the sleeve is put into operation newly, and acquiring a value of the sleeve capacitor and a value of the insulation resistance when the sleeve is checked regularly;
obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is subjected to regular inspection;
acquiring a sleeve oilpaper damping function;
and determining the micro-water content of the sleeve according to the moisture function, the ratio of the sleeve capacitance and the ratio of the insulation resistance.
2. The method of claim 1, wherein the step of obtaining the ratio of the casing capacitance to the insulation resistance based on the value of the casing capacitance and the value of the insulation resistance at the time of commissioning the casing, and the value of the casing capacitance and the value of the insulation resistance at the time of regular inspection of the casing comprises:
obtaining a ratio of the casing capacitance according to the casing capacitance value during the casing commissioning and the casing capacitance value during the casing regular inspection;
and obtaining the ratio of the insulation resistances according to the value of the insulation resistance when the sleeve is put into operation and the value of the insulation resistance when the sleeve is subjected to regular inspection.
3. The method of claim 1, wherein said step of determining casing micro-water content based on said wetting function, said ratio of casing capacitance and said ratio of insulation resistance comprises:
determining the oiled paper dielectric constant change rate and the oiled paper resistance change rate of the sleeve according to the ratio of the sleeve capacitance to the ratio of the insulation resistance;
and determining the micro-water content of the casing according to the wetting function, the change rate of the dielectric constant of the oilpaper and the change rate of the resistance of the oilpaper.
4. The method of claim 3, wherein said step of determining casing micro-water content from said wetting function, said rate of change of tarp dielectric constant and said rate of change of tarp resistance comprises:
obtaining the micro-water content of the oiled paper part for the first time according to the moisture function and the change rate of the dielectric constant of the oiled paper;
obtaining the micro-water content of the oilpaper part for the second time according to the moisture function and the oilpaper resistance change rate;
and determining the micro-water content of the sleeve according to the micro-water content obtained for the first time and the micro-water content obtained for the second time.
5. The method according to claim 4, wherein in the step of determining the micro water content of the casing according to the micro water content obtained for the first time and the micro water content obtained for the second time, the specific step of determining the micro water content of the casing comprises:
and calculating the weighted average value of the micro-water content obtained twice, wherein the weighted average value is the micro-water content of the casing.
6. A system for measuring the moisture content of a portion of oil paper in a capacitive bushing, comprising:
the first acquisition unit is used for acquiring the value of the sleeve capacitor and the value of the insulation resistance when the sleeve is put into operation newly, and acquiring the value of the sleeve capacitor and the value of the insulation resistance when the sleeve is checked regularly;
the first calculation unit is used for obtaining the ratio of the sleeve capacitance to the insulation resistance according to the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is put into operation, and the value of the sleeve capacitance and the value of the insulation resistance when the sleeve is checked regularly;
the second acquisition unit is used for acquiring a sleeve oilpaper damping function;
and the second calculation unit is used for determining the micro-water content of the sleeve according to the damping function, the ratio of the sleeve capacitance and the ratio of the insulation resistance.
7. The system of claim 6, wherein the first computing unit comprises:
the capacitance calculation unit is used for obtaining the ratio of the sleeve capacitance according to the value of the sleeve capacitance when the sleeve is put into operation and the value of the sleeve capacitance when the sleeve is subjected to regular inspection;
and the resistance calculation unit is used for obtaining the ratio of the insulation resistances according to the value of the insulation resistance when the sleeve is put into operation and the value of the insulation resistance when the sleeve is subjected to regular inspection.
8. The system of claim 6, wherein the second obtaining unit comprises:
the change rate obtaining unit is used for determining the change rate of the oiled paper dielectric constant and the change rate of the oiled paper resistance of the sleeve according to the ratio of the sleeve capacitance and the ratio of the insulation resistance;
and the content determining unit is used for determining the micro-water content of the sleeve according to the wetting function, the change rate of the dielectric constant of the oilpaper and the change rate of the resistance of the oilpaper.
9. The system of claim 8, wherein the content determination unit comprises:
the third calculation unit is used for obtaining the micro-water content of the oiled paper part for the first time according to the moisture function and the change rate of the dielectric constant of the oiled paper;
the fourth calculation unit is used for obtaining the micro-water content of the oiled paper part for the second time according to the wetting function and the oiled paper resistance change rate;
and the fifth calculation unit is used for determining the micro-water content of the sleeve according to the micro-water content obtained for the first time and the micro-water content obtained for the second time.
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| 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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