CN112557247A - GIS (gas insulated switchgear) intracavity humidity detection method considering installation environment factors - Google Patents

GIS (gas insulated switchgear) intracavity humidity detection method considering installation environment factors Download PDF

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CN112557247A
CN112557247A CN202011391588.XA CN202011391588A CN112557247A CN 112557247 A CN112557247 A CN 112557247A CN 202011391588 A CN202011391588 A CN 202011391588A CN 112557247 A CN112557247 A CN 112557247A
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cavity
gas
gis
moisture
mass
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卞宏志
黄明祥
张建勋
洪谊东
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State Grid Fujian Electric Power Co Ltd
Construction Branch of State Grid Fujian Electric Power Co Ltd
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State Grid Fujian Electric Power Co Ltd
Construction Branch of State Grid Fujian Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content

Abstract

The invention relates to a GIS (gas insulated switchgear) intracavity humidity detection method considering installation environment factors, which comprises the following steps: step S1, acquiring installation environment parameters and GIS body parameters; step S2, calculating the mass of gas moisture and the mass of total moisture in the GIS cavity according to the obtained parameters; step S3, drying the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying; and step S4, calculating to obtain the relative humidity in the outlet cavity in the balanced state according to the obtained mass of the gas moisture in the GIS cavity, the total mass of the moisture and the mass of the residual moisture in the gas in the cavity after drying treatment. The invention can accurately detect the humidity in the GIS cavity under different installation environments and ensure the reliability of GIS installation.

Description

GIS (gas insulated switchgear) intracavity humidity detection method considering installation environment factors
Technical Field
The invention relates to the field of GIS cavity detection, in particular to a GIS cavity inner humidity detection method considering installation environment factors.
Background
The electrical insulation of SF6 gas within a GIS chamber is particularly important for safety of the equipment and stability of the power system. In the GIS equipment, the SF6 gas as an arc extinguishing and insulating medium does not allow moisture to exist in principle, but is inevitably affected by the moisture in the actual installation process, and the excessive moisture can greatly reduce the insulating property of the system and threaten the safe and stable operation of the GIS equipment, so that a large amount of manpower and material resources are needed to reinstall the debugging equipment.
Generally, the moisture content entering the GIS is closely related to the temperature and humidity of the installation environment. And (4) installing equipment in different temperature and humidity environments, and finally, carrying out drying process treatment to obtain different residual moisture contents in the air chamber. Therefore, the research is carried out under the installation environment with different temperatures and humidity, the water change rule in the installation process is analyzed, the final water content in the air chamber is calculated, and whether the installation meets the standard under the current environment is further judged, so that the method has important significance for guiding the GIS equipment to be installed under different temperatures and humidity in the future and knowing the residual water content of the cavity after the installation is finished.
Disclosure of Invention
In view of this, the present invention provides a method for detecting humidity in a GIS chamber in consideration of installation environment factors, which can accurately detect humidity in the GIS chamber in different installation environments, and ensure reliability of GIS installation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a GIS (gas insulated switchgear) intracavity humidity detection method considering installation environment factors comprises the following steps:
step S1, acquiring installation environment parameters and GIS body parameters;
step S2, calculating the mass of gas moisture and the mass of total moisture in the GIS cavity according to the obtained parameters;
step S3, drying the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying;
and step S4, calculating to obtain the relative humidity in the outlet cavity in the balanced state according to the obtained mass of the gas moisture in the GIS cavity, the total mass of the moisture and the mass of the residual moisture in the gas in the cavity after drying treatment.
Further, the step S1 is specifically: obtaining parameters of installation environment including temperature T and humidity R of current installation environmentHAnd atmospheric pressure P; obtaining GIS body parameters including volume V, inner wall and device surface area A, insulator material and insulator mass maAdsorbent material, adsorbent bulk density ρ1Volume V of adsorbent1SF6 moisture mass fraction K of fresh gasd。
Further, the step S2 is specifically:
step S21, opening the GIS cavity to install the adsorbent, and calculating the moisture quality of the gas in the cavity according to the GIS body parameters;
step S22, calculating the moisture quality of the inner wall of the cavity and the surface of the device according to the GIS body parameters;
step S23, calculating the moisture adsorption mass of the surface layer of the adsorbent according to the property of the adsorbent;
step S24, calculating the water content of the insulator according to the GIS body parameters;
and step S25, calculating the mass of the water and the total mass of the water in the gas in the GIS cavity after the adsorbent mounting stage is completed according to the data obtained in the steps S21-S24.
Further, the step S21 is specifically: opening the GIS cavity to install the adsorbent, and setting the absolute temperature T and humidity R of the gas inside and outside the cavity to be consistent with the external air environmentHThe pressure is consistent with the atmospheric pressure P, and the volume V of the GIS cavity and the mass m of the water content of the gas in the GIS cavity are known according to the type of the GIS0Comprises the following steps:
Figure BDA0002811123610000031
wherein e is the actual water vapor pressure (pa); r*Is an ideal gas constant, is R*8.314J/(mol K); m is the molar mass of water vapor (g/mol);
the saturated water vapor pressure E at the current installation temperature is:
Figure BDA0002811123610000032
wherein t is the gas temperature (DEG C);
relative humidity RHComprises the following steps:
Figure BDA0002811123610000033
further, the step S23 is specifically:
a. obtaining the bulk density rho of the adsorbent according to the type of the adsorbent1And adsorbent volume V1Calculating the mass m of water adsorbed on the surface layer of the adsorbent during installation2：
m2＝Kb·V1·ρ1
Wherein, KbThe water adsorption rate;
b. if the saturated adsorption rate of the adsorbent used in the current adsorbent installation environment is K, the maximum residual adsorption quantity Δ m of the adsorbent is the maximum residual adsorption quantity Δ m of the adsorbent except for the water adsorbed on the surface layer of the adsorbent after the adsorbent is installed in the cavity2Comprises the following steps:
Δm2＝K·V1·ρ1-m2
wherein K is the adsorption coefficient.
Further, the step S3 is specifically:
step S31, carrying out vacuum pumping treatment on the GIS cavity, and calculating the moisture mass in the residual air in the cavity;
step S32, standing the GIS body for a preset time to obtain the moisture quality of the gas in the cavity;
step S33: carrying out secondary vacuum-pumping treatment on the GIS cavity, and calculating the mass of water in the residual air in the cavity;
step S34: and (4) filling the SF6 gas into the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying treatment according to the moisture mass of the residual air in the cavity obtained in the step S33.
Further, the step S31 is specifically: vacuumizing the air pressure in the cavity from the atmospheric pressure P to the pressure P by using a vacuum pump1Assuming that only part of moisture in the air in the cavity is pumped out in the vacuum pumping process, the mass of the moisture in the residual air in the cavity is delta m0Comprises the following steps:
Figure BDA0002811123610000041
further, the step S32 is specifically:
a. the low-pressure environment in the cavity after vacuumizing is favorable for desorbing moisture on the inner wall of the cavity and the surface of a device to form water vapor in the gas in the cavity, and the desorption amount m4In relation to the standing treatment time:
m4＝γ·m1
wherein gamma is a desorption coefficient;
b. during the standing process, the adsorption effect of the adsorbent on the moisture in the gas flowing process is ignored, and at the moment, the mass m of the moisture in the gas in the cavity is5Comprises the following steps:
m5＝Δm0+m4。
further, the step S34 is specifically:
a. according to SF6 gas parameter, namely the known moisture mass fraction K of SF6 fresh gasdMass m of water entering the chamber with SF6 gas6Comprises the following steps:
m6＝10-6·Kd·ρ·V
wherein rho is SF6 gas filling pressure P2The gas density of time;
because the SF6 gas does not satisfy the property of ideal gas, the gas is inflated to the rated pressure P2The relationship between the density and the rho is obtained by an empirical formula:
P2＝56.2ρT(1+B)-ρ2A
A＝74.9(1-0.727×10-3ρ)
B＝2.51×10-3ρ(1-0.846×10-3ρ)
b. after the inflation is finished, calculating the mass m of the total water content of the gas in the cavity at the moment7：
m7＝m6+Δm5
Wherein Δ m5The mass of moisture in the air remaining in the chamber.
Further, the step S4 is specifically:
a. after the drying treatment and the SF6 inflation are finished, the balance among the gas in the cavity, the insulating material and the adsorbent is not established, the gas in the cavity, the insulating material and the adsorbent are kept standing for presetting to reach a balance state, and the moisture content m in the gas in the cavity after the balance is calculated8：
m8＝m7+α·m3-β·Δm2
Wherein α is the diffusion coefficient; beta is the moisture adsorption coefficient of the adsorbent;
b. the relative humidity R in the cavityH1Comprises the following steps:
Figure BDA0002811123610000051
wherein e is1The partial pressure of water vapor in the cavity; e1Is the saturated water vapor partial pressure at the current temperature.
Compared with the prior art, the invention has the following beneficial effects:
the invention can accurately detect the humidity in the GIS cavity under different installation environments and ensure the reliability of GIS installation.
Drawings
FIG. 1 is a flow diagram of the method of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Referring to fig. 1, the present invention provides a method for detecting humidity in a GIS chamber considering installation environment factors, including the following steps:
step S1, acquiring installation environment parameters and GIS body parameters;
the method specifically comprises the following steps: obtaining parameters of installation environment including temperature T and humidity R of current installation environmentHAnd atmospheric pressure P; obtaining GIS body parameters including volume V, inner wall and device surface area A, insulator material and insulator mass maAdsorbent material, adsorbent bulk density ρ1Volume V of adsorbent1SF6 moisture mass fraction K of fresh gasd。
Step S2, calculating the mass of gas moisture and the mass of total moisture in the GIS cavity according to the obtained parameters;
in this embodiment, step S2 specifically includes:
and step S21, opening the GIS cavity for installing the adsorbent, and assuming that the interior of the GIS cavity is consistent with the external air environment at the moment. I.e. the absolute temperature T and humidity R of the gas inside and outside the cavityHAs is the atmospheric pressure P. Giving a GIS model, namely knowing the volume V of a GIS cavity and the mass m of the moisture in the gas in the GIS cavity0Comprises the following steps:
Figure BDA0002811123610000061
wherein e is the actual water vapor pressure (pa); r*Is an ideal gas constant, is R*8.314J/(mol K); m is the molar mass of water vapor (g/mol).
The saturated water vapor pressure E at the current installation temperature is:
Figure BDA0002811123610000071
wherein t is a gas temperature (. degree. C.).
Relative humidity RHComprises the following steps:
Figure BDA0002811123610000072
step S22, calculating the moisture mass m of the inner wall of the cavity and the surface of the device according to the GIS body parameters1
OpenThe inner wall of the cavity body and the surface of the device have the adsorption effect on moisture in the air after the cavity body, and a water layer with the thickness of 10 monomolecular layers at most can be formed. Calculating the moisture mass m of the inner wall of the GIS according to the type of the cavity in the step A, namely the sum A of the surface areas of the inner wall of the GIS and the device1：
m1＝Ka·A·RH
Wherein, KaThe mass per unit area of 10 monomolecular layer water films was 2.99X 10-6kg/m2。
Step S23, calculating the mass m of the water adsorbed by the surface layer of the adsorbent according to the property of the adsorbent2
The desiccant is removed from the activation oven and installed in the GIS chamber, typically for no more than 15 minutes. The surface layer of the adsorbent exposed to air is very likely to adsorb moisture. Bulk density ρ of a given adsorbent species, i.e. a known adsorbent1And adsorbent volume V1Calculating the mass m of water adsorbed on the surface layer of the adsorbent during installation2：
m2＝Kb·V1·ρ1
Wherein, KbThe moisture adsorption rate is closely related to the type of adsorbent and the time of exposure to the installation environment, and is usually 0<Kb≤3％。
b. The saturation adsorption rate of the adsorbent is an important standard for judging the adsorption performance of the adsorbent. Assuming that the saturation adsorption rate of the adsorbent used in the current adsorbent installation environment is K, the maximum residual adsorption amount Δ m of the adsorbent is obtained after the adsorbent is installed in the cavity, except for the moisture adsorbed on the surface layer of the adsorbent2Comprises the following steps:
Δm2＝K·V1·ρ1-m2
wherein K is related to the type of the adsorbent and the pressure, temperature and relative humidity of the environment in which the adsorbent is located, and preferably, K is more than or equal to 20% and less than or equal to 35%.
Step S24, calculating the water content m of the insulator according to the GIS body parameters3
The insulator can absorb before being manufactured and stored until being installed in the GISA certain amount of moisture. Given the insulator type, i.e. mass m of the known insulatoraWith water content KcWater content m of insulator itself3Comprises the following steps:
m3＝Kc·ma
wherein, the insulators of different materials pour and deposit under the environment of different temperature and humidity, its moisture content KcIs different, usually 0.01% ≦ Kc≤0.5％。
Step S25, calculating the mass M of the moisture in the gas in the GIS cavity after the adsorbent mounting stage is completed according to the data obtained in the steps S21-S240With the total moisture mass M1。
M0＝m0
M1＝m0+m1+m2+m3
Step S3, drying the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying;
in this embodiment, step S3 specifically includes:
and step S31, vacuumizing to remove moisture in the air in the cavity. Vacuumizing the air pressure in the cavity from the atmospheric pressure P to the pressure P by using a vacuum pump1Assuming that only part of moisture in the air in the cavity is pumped out in the vacuum pumping process, the mass of the moisture in the residual air in the cavity is delta m0Comprises the following steps:
Figure BDA0002811123610000091
the water quality m of the inner wall of the cavity and the surface of the device in the vacuumizing treatment stage1The mass m of water adsorbed on the surface layer of the adsorbent2The water content m of the insulator3The influence is small, the calculation model is simplified, and the quality of the three is assumed not to change in the vacuumizing stage.
Step S32, standing the GIS body for a preset time to obtain the moisture quality of the gas in the cavity;
the low-pressure environment in the vacuum-pumping cavity is favorable for the inner wall of the cavityAnd the moisture on the surface of the device (including the surface of the insulator) is desorbed and changed into water vapor in the gas in the cavity. The longer the standing time is, the larger the desorption amount is, and the desorption amount m is4In relation to the standing treatment time:
m4＝γ·m1
wherein gamma is a desorption coefficient, and when the mixture is kept stand for 1 hour, the gamma is 60 percent; standing for 2 hours, and taking gamma of 60 percent to 80 percent.
b. In the standing process, the gas in the cavity has weak fluidity, the calculation model is simplified, the adsorption effect of the adsorbent on the moisture in the gas flowing process is ignored, and the mass m of the moisture in the gas in the cavity is calculated5Comprises the following steps:
m5＝Δm0+m4
step S33: carrying out secondary vacuum-pumping treatment on the GIS cavity, and calculating the mass of water in the residual air in the cavity;
pumping out moisture in the gas in the cavity after the standing process by using a vacuum pump, and if only partial moisture in the air in the cavity is pumped out in the second vacuumizing process, the mass delta m of the moisture in the residual air in the cavity5Comprises the following steps:
Δm5＝(1-λ)m5
wherein, lambda is the vacuum pump air extraction efficiency and the time correlation coefficient of bleeding, and lambda is 0< lambda <1, and the higher the air extraction efficiency of vacuum pump, the longer the time of bleeding, the bigger the lambda value is.
Step S34: and (4) filling the SF6 gas into the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying treatment according to the moisture mass of the residual air in the cavity obtained in the step S33.
Sf6 gas itself contains trace amounts of moisture. By the given SF6 gas parameter, namely the moisture mass fraction K of the new gas of the known SF6d(usually not more than 8. mu.g/g), mass m of water entering the chamber with SF6 gas6Comprises the following steps:
m6＝10-6·Kd·ρ·V
wherein rho is SF6 gas filling pressure P2The gas density of (c). Since the SF6 gas does not satisfy the ideal gasIs inflated to the rated pressure P2The relationship between the density and the rho is obtained by an empirical formula:
P2＝56.2ρT(1+B)-ρ2A
A＝74.9(1-0.727×10-3ρ)
B＝2.51×10-3ρ(1-0.846×10-3ρ)
b. after the inflation is finished, calculating the mass m of the total water content of the gas in the cavity at the moment7：
m7＝m6+Δm5。
And step S4, calculating to obtain the relative humidity in the outlet cavity in the balanced state according to the obtained mass of the gas moisture in the GIS cavity, the total mass of the moisture and the mass of the residual moisture in the gas in the cavity after drying treatment.
In this embodiment, step S4 specifically includes:
a. after the drying treatment and the SF6 inflation are finished, the balance among the gas in the cavity, the insulating material and the adsorbent is not established, the balance state is achieved after the standing for 2 hours, and the moisture content m in the gas in the cavity after the balance is calculated8：
m8＝m7+α·m3-β·Δm2
Wherein alpha is the diffusion coefficient of the insulator moisture after standing for two hours; beta is the water adsorption coefficient of the adsorbent.
b. Assuming that the 2-hour standing process makes the temperature inside the cavity identical to the external temperature after the installation, the relative humidity R in the cavity is the same at the momentH1Comprises the following steps:
Figure BDA0002811123610000111
wherein e is1Is the partial pressure (pa) of water vapor in the cavity; e1Is the saturated water vapor partial pressure (pa) at the current temperature; the following two equations can be used to obtain:
Figure BDA0002811123610000112
wherein, T1The absolute temperature (K) of the gas in the cavity after the installation is finished.
Figure BDA0002811123610000113
Wherein, t1The temperature (DEG C) of the gas in the chamber after the completion of the mounting.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (10)

1. A GIS (gas insulated switchgear) intracavity humidity detection method considering installation environment factors is characterized by comprising the following steps:
step S1, acquiring installation environment parameters and GIS body parameters;
step S2, calculating the mass of gas moisture and the mass of total moisture in the GIS cavity according to the obtained parameters;
step S3, drying the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying;
and step S4, calculating to obtain the relative humidity in the outlet cavity in the balanced state according to the obtained mass of the gas moisture in the GIS cavity, the total mass of the moisture and the mass of the residual moisture in the gas in the cavity after drying treatment.
2. The method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 1, wherein the step S1 specifically comprises: obtaining parameters of installation environment including temperature T and humidity R of current installation environmentHAnd atmospheric pressure P; obtaining GIS body parameters including volume V, inner wall and device surface area A, insulator material and insulator mass maAdsorbent material, adsorbent bulk density ρ1Volume V of adsorbent1SF6 moisture mass fraction K of fresh gasd。
3. The method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 1, wherein the step S2 specifically comprises:
step S21, opening the GIS cavity to install the adsorbent, and calculating the moisture quality of the gas in the cavity according to the GIS body parameters;
step S22, calculating the moisture quality of the inner wall of the cavity and the surface of the device according to the GIS body parameters;
step S23, calculating the moisture adsorption mass of the surface layer of the adsorbent according to the property of the adsorbent;
step S24, calculating the water content of the insulator according to the GIS body parameters;
and step S25, calculating the mass of the water and the total mass of the water in the gas in the GIS cavity after the adsorbent mounting stage is completed according to the data obtained in the steps S21-S24.
4. The method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 3, wherein the step S21 is specifically as follows: opening the GIS cavity to install the adsorbent, and setting the absolute temperature T and humidity R of the gas inside and outside the cavity to be consistent with the external air environmentHThe pressure is consistent with the atmospheric pressure P, and the volume V of the GIS cavity and the mass m of the water content of the gas in the GIS cavity are known according to the type of the GIS0Comprises the following steps:
Figure FDA0002811123600000021
wherein e is the actual water vapor pressure (pa); r*Is an ideal gas constant, is R*8.314J/(mol K); m is the molar mass of water vapor (g/mol);
the saturated water vapor pressure E at the current installation temperature is:
Figure FDA0002811123600000022
wherein t is the gas temperature (DEG C);
relative humidity RHComprises the following steps:
Figure FDA0002811123600000023
5. the method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 3, wherein the step S23 is specifically as follows:
a. obtaining the bulk density rho of the adsorbent according to the type of the adsorbent1And adsorbent volume V1Calculating the mass m of water adsorbed on the surface layer of the adsorbent during installation2：
m2＝Kb·V1·ρ1
Wherein, KbThe water adsorption rate;
b. if the saturated adsorption rate of the adsorbent used in the current adsorbent installation environment is K, the maximum residual adsorption quantity Δ m of the adsorbent is the maximum residual adsorption quantity Δ m of the adsorbent except for the water adsorbed on the surface layer of the adsorbent after the adsorbent is installed in the cavity2Comprises the following steps:
Δm2＝K·V1·ρ1-m2
wherein K is the adsorption coefficient.
6. The method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 1, wherein the step S3 specifically comprises:
step S31, carrying out vacuum pumping treatment on the GIS cavity, and calculating the moisture mass in the residual air in the cavity;
step S32, standing the GIS body for a preset time to obtain the moisture quality of the gas in the cavity;
step S33: carrying out secondary vacuum-pumping treatment on the GIS cavity, and calculating the mass of water in the residual air in the cavity;
step S34: and (4) filling the SF6 gas into the GIS cavity, and calculating the residual moisture mass of the gas in the cavity after drying treatment according to the moisture mass of the residual air in the cavity obtained in the step S33.
7. The method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 6, wherein the step S31 is specifically as follows: vacuumizing the air pressure in the cavity from the atmospheric pressure P to the pressure P by using a vacuum pump1Assuming that only part of moisture in the air in the cavity is pumped out in the vacuum pumping process, the mass of the moisture in the residual air in the cavity is delta m0Comprises the following steps:
Figure FDA0002811123600000041
8. the method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 6, wherein the step S32 is specifically as follows:
a. the low-pressure environment in the cavity after vacuumizing is favorable for desorbing moisture on the inner wall of the cavity and the surface of a device to form water vapor in the gas in the cavity, and the desorption amount m4In relation to the standing treatment time:
m4＝γ·m1
wherein gamma is a desorption coefficient;
b. during the standing process, the adsorption effect of the adsorbent on the moisture in the gas flowing process is ignored, and at the moment, the mass m of the moisture in the gas in the cavity is5Comprises the following steps:
m5＝Δm0+m4。
9. the method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 6, wherein the step S34 is specifically as follows:
a. according to SF6 gas parameter, namely the known moisture mass fraction K of SF6 fresh gasdMass m of water entering the chamber with SF6 gas6Comprises the following steps:
m6＝10-6·Kd·ρ·V
wherein rho is SF6 gas filling pressure P2The gas density of time;
because the SF6 gas does not satisfy the property of ideal gas, the gas is inflated to the rated pressure P2The relationship between the density and the rho is obtained by an empirical formula:
P2＝56.2ρT(1+B)-ρ2A
A＝74.9(1-0.727×10-3ρ)
B＝2.51×10-3ρ(1-0.846×10-3ρ)
b. after the inflation is finished, calculating the mass m of the total water content of the gas in the cavity at the moment7：
m7＝m6+Δm5
Wherein Δ m5The mass of moisture in the air remaining in the chamber.
10. The method for detecting the humidity in the GIS cavity considering the installation environment factors according to claim 1, wherein the step S4 specifically comprises:
a. after the drying treatment and the SF6 inflation are finished, the balance among the gas in the cavity, the insulating material and the adsorbent is not established, the gas in the cavity, the insulating material and the adsorbent are kept standing for presetting to reach a balance state, and the moisture content m in the gas in the cavity after the balance is calculated8：
m8＝m7+α·m3-β·Δm2
Wherein α is the diffusion coefficient; beta is the moisture adsorption coefficient of the adsorbent;
b. the relative humidity R in the cavityH1Comprises the following steps:
Figure FDA0002811123600000051
wherein e is1The partial pressure of water vapor in the cavity; e1Is the saturated water vapor partial pressure at the current temperature.
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