CN109375016A - Test method for decomposition characteristics of sulfur hexafluoride at different overheating failure temperatures - Google Patents
Test method for decomposition characteristics of sulfur hexafluoride at different overheating failure temperatures Download PDFInfo
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Abstract
Resolution characteristic test method that the invention discloses a kind of sulfur hexafluorides at a temperature of different Superheated steam driers, it includes: the air-tightness of sealed gas chamber in joint test system and inspection system；The cleaning for carrying out sealed gas chamber will decompose after sealed gas chamber vacuumizes and be filled with the new gas of SF6, then vacuumized, repeated this process 3 times again；Simulated failure temperature value needed for setting is simultaneously tested；SF6 decomposition components sample gas is taken from gas production mouth, quantitative analysis is carried out to sample component.The present invention can detect the characteristic of sulfur hexafluoride decomposition product at different temperatures, more comprehensively detection SF6Decomposition components, for comprehensive, systematic research SF6Overheat decomposing phenomenon has established experiment basis, and can construct related component Characteristic Ratios accordingly, for characterizing the severity and its development trend of Superheated steam drier.
Description
Technical field
The present invention relates to sulfur hexafluorides to decompose the field of test technology, and especially a kind of sulfur hexafluoride is in different Superheated steam driers
At a temperature of resolution characteristic test method.
Background technique
Currently, for the POF in SF6 gas-insulated equipment, there are no a set of effective detection and diagnostic methods.It is logical
Normal way is to be connected in offline regular maintenance by the contact resistance in the entire circuit of measuring device come the circuit to equipment
Situation diagnoses, it is clear that this method can not find the problem of poor contact in time.And infrared indirect thermometry, due to SF6 gas
Strong absorbent and the internal complicated structure of SF6 gas-insulated equipment to infrared luminous energy often lead to be difficult accurately to obtain failure
True temperature at point.In addition, the influence of the totally-enclosed property of SF6 air insulating device and extraneous environmental factor complicated and changeable,
Limit the application on site of existing infrared temperature measurement apparatus.
In recent years, it is decomposed at PD using SF6 and generates various characteristic components and its changing rule come in diagnostic device
Portion's failure has become the hot spot of industry concern.Based on the above issues, propose a kind of sulfur hexafluoride in different Superheated steam drier temperature
Spend the test method of lower resolution characteristic.
Summary of the invention
In view of the above drawbacks of the prior art, it is an object of the invention to provide a kind of sulfur hexafluorides different excessively hot
Resolution characteristic test method under Faulty Temperature can detect the characteristic of sulfur hexafluoride decomposition product at different temperatures.
It is realized the purpose of the present invention is technical solution in this way, a kind of sulfur hexafluoride is in different Superheated steam drier temperature
Lower resolution characteristic test method is spent, it includes:
S1: the air-tightness of sealed gas chamber in joint test system and inspection system；
S2: carrying out the cleaning of sealed gas chamber, will decompose after sealed gas chamber vacuumizes and is filled with the new gas of SF6, is then taken out again
Vacuum repeats this process 3 times；
S3: it sets required simulated failure temperature value and is tested；
S4: taking SF6 decomposition components sample gas from gas production mouth, carries out quantitative analysis to sample component.
Further, check that the air-tightness of sealed gas chamber has specifically included in the step S1:
S11: each functional component of joint test system；
S12: it is vacuumized with vacuum pump to sealed gas chamber is decomposed, closes vacuum when the indoor vacuum degree of gas is 0.005MPa
Pump；
S13: 10~12 hours are stood；
S14: judge whether the pressure vacuum gauge registration after standing is maintained at 0.005~0.006MPa；If so, showing
The airtight performance for thermally decomposing sealed gas chamber is intact；Conversely, then showing that the airtight performance for thermally decomposing sealed gas chamber was not intact.
Further, since overheat sealed gas chamber will not only bear positive pressure during the test, the effect of negative pressure is still suffered from,
Therefore,
A) make the used time when sealed gas chamber bears interior pressure, overheat sealed gas chamber wall thickness SiIt should meet:
In formula, SiFor the wall thickness for overheating sealed gas chamber；P is limit allowable specific pressure；D is the cavity diameter of sealed gas chamber；C is
Additional thickness, C take 0.005~0.01m；σ is the allowable stress of material, calculating formula are as follows:
In formula, σbRepresent material standard tensile strength lower limit value；σsRepresent material standard room temperature yield point；nbRepresent tension
The safety coefficient of intensity；nsIndicate the safety coefficient of yield point；
B) when sealed gas chamber bears external pressure, the wall thickness S of sealed gas chamber0It should meet:
In formula, S0For the wall thickness of the sealed gas chamber in the case where external pressure acts on；Pa is that critical external pressure is strong；D is the chamber of sealed gas chamber
Body diameter；E is the elasticity modulus of material, and E takes 172~200GPa.
Further, the quantitative analysis in the step S4 includes:
The quality m of fractions tested iiOr its concentration c in the sampleiIt is directly proportional to the response of detector, fundamental formular
Are as follows:
mi=fi×Ai(4)；
Wherein, fiFor the response factor of component i；
Quantitative calculation formula is as follows:
In formula, Ai、As,iRespectively sample, i-th group of component gas peak area in standard specimen；ci、cs,iRespectively sample, standard specimen
In i-th group of component gas content；Ki is the slope i.e. Absolute Calibration factor of calibration curve.
Further, include in the sulfur hexafluoride decomposition product: SO2、SOF2、SOF4、SO2F2、CF4And H2S。
By adopting the above-described technical solution, the present invention has the advantage that: the present invention can examine at different temperatures
The characteristic of sulfur hexafluoride decomposition product is surveyed, more comprehensively detection SF6Decomposition components, for comprehensive, systematic research SF6Overheat point
Solution phenomenon has established experiment basis, and can construct related component Characteristic Ratios accordingly, for characterizing Superheated steam drier
Severity and its development trend.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.
Detailed description of the invention
Detailed description of the invention of the invention is as follows:
Fig. 1 is the flow diagram of sulfur hexafluoride resolution characteristic test method at a temperature of different Superheated steam driers.
Fig. 2 is SO2F2With SOF4Graph of relation between production quantity and Faulty Temperature.
Fig. 3 is SO2F2With SOF4Graph of relation between production quantity and fault time.
Fig. 4 is SOF2Graph of relation between production quantity and Faulty Temperature.
Fig. 5 is SOF2Graph of relation between production quantity and fault time.
Fig. 6 is SO2Graph of relation between production quantity and Faulty Temperature.
Fig. 7 is SO2Graph of relation between production quantity and fault time.
Fig. 8 is H2Graph of relation between S production quantity and Faulty Temperature.
Fig. 9 is H2S production quantity and the graph of relation between fault time.
Figure 10 is CF4Graph of relation between production quantity and Faulty Temperature.
Figure 11 is CF4Graph of relation between production quantity and fault time.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1；A kind of sulfur hexafluoride resolution characteristic test method at a temperature of different Superheated steam driers, it includes
Have:
S1: the air-tightness of sealed gas chamber in joint test system and inspection system；
S2: carrying out the cleaning of sealed gas chamber, will decompose after sealed gas chamber vacuumizes and is filled with the new gas of SF6, is then taken out again
Vacuum repeats this process 3 times；
S3: it sets required simulated failure temperature value and is tested；
S4: taking SF6 decomposition components sample gas from gas production mouth, carries out quantitative analysis to sample component.
Check that the air-tightness of sealed gas chamber has specifically included in the step S1:
S11: each functional component of joint test system；
S12: it is vacuumized with vacuum pump to sealed gas chamber is decomposed, closes vacuum when the indoor vacuum degree of gas is 0.005MPa
Pump；
S13: 10~12 hours are stood；
S14: judge whether the pressure vacuum gauge registration after standing is maintained at 0.005~0.006MPa；If so, showing
The airtight performance for thermally decomposing sealed gas chamber is intact；Conversely, then showing that the airtight performance for thermally decomposing sealed gas chamber was not intact.
Sealed gas chamber is equipped with air inlet and air outlet, and overheat point occurs to SF6 gas and acquisition needed for being filled with test
Gaseous sample after solution, in order to facilitate vacuum degree and SF6 atmospheric pressure value in accurate monitoring device, on the left of sealed gas chamber thief hatch
It is rotated by 90 ° Position Design and is mounted with pressure vacuum gauge, measurement range is -0.1~0.5Mp.
Since overheat sealed gas chamber will not only bear positive pressure during the test, the effect of negative pressure is still suffered from, therefore,
A) make the used time when sealed gas chamber bears interior pressure, overheat sealed gas chamber wall thickness SiIt should meet:
In formula, SiFor the wall thickness for overheating sealed gas chamber；P is limit allowable specific pressure；Determine that P takes according to experimental condition
0.5MPa；D is the cavity diameter of sealed gas chamber, and taking D is 0.24m；C is additional thickness, determines that C takes 0.005 according to experimental condition
~0.01m；σ is the allowable stress of material, calculating formula are as follows:
In formula, σbRepresent material standard tensile strength lower limit value；σsRepresent material standard room temperature yield point；nbRepresent tension
The safety coefficient of intensity；nsIndicate the safety coefficient of yield point；N in present embodimentb=4.0MPa, ns=2.5Mpa.
B) when sealed gas chamber bears external pressure, the wall thickness S of sealed gas chamber0It should meet:
In formula, S0For the wall thickness of the sealed gas chamber in the case where external pressure acts on；Pa is that critical external pressure is strong, (is taken out true by experimental condition
When empty) it is found that Pa is about 0.1MPa, when calculating, takes Pa=0.1MPa；D is the cavity diameter of sealed gas chamber, is 0.24m；E is
The elasticity modulus of material, E take 172~200GPa.
Quantitative analysis in the step S4 includes:
The quality m of fractions tested iiOr its concentration c in the sampleiIt is directly proportional to the response of detector, fundamental formular
Are as follows:
mi=fi×Ai(4)；
Wherein, fiFor the response factor of component i；Type, operation condition of chromatogram and the constitutive property etc. of it and detector
Factor is related.
When quantitative detection, the peak area of component chromatographic peak is measured first, is then calculated by the standard working curve of the component
Its concentration in the sample, quantitative calculation formula are as follows:
In formula, Ai、As,iRespectively sample, i-th group of component gas peak area in standard specimen；ci、cs,iRespectively sample, standard specimen
In i-th group of component gas content；Ki is the slope i.e. Absolute Calibration factor of calibration curve.
Include in the sulfur hexafluoride decomposition product: SO2、SOF2、SOF4、SO2F2、CF4And H2S。
Embodiment 1, SO2F2 and SOF4 component characteristic；
Due to SOF4Chemical property is extremely unstable, in gas production, detection process easily with H2O occurs hydrolysis and generates
SO2F2, and SO2F2Property is relatively stable, therefore by SO2F2And SOF4Consider as a whole.It is 260 DEG C in overheating fault temperature
At~500 DEG C, SF6Occur to decompose the SO generated2F2+SOF4As shown in Figures 2 and 3.
Can obtain and such as draw a conclusion: (1) Superheated steam drier temperature only generates minimal amount of SO at 260~340 DEG C2F2+SOF4
(< 2ppm) is generated, and production quantity difference is unobvious；And when Superheated steam drier temperature is 360 DEG C~420 DEG C, SO2F2+SOF4
Gas concentration starts to show different degrees of growth trend with the extension of time, but final highest also only has 10ppm or so,
And when having served as thermal fault temperature higher than 420 DEG C, SO2F2+SOF4Concentration start to steeply rise in the form of exponential increase,
As shown in Figure 2.
(2) at a temperature of different faults, with the lasting progress of decomposition, SO2F2+SOF4Production quantity can all undergo one
First slowly increase, then rapid growth, finally gradually tend to the process of saturation, but enters the time of saturation state with failure
The raising of temperature and extend, as shown in Figure 3.
(3) at a temperature of different faults, SO2F2+SOF4Gas concentration profile is all had any different, especially in overheating fault height
When 400 DEG C, gas concentration profile difference is become apparent, and illustrates SO2F2+SOF4The formation of component and its generating rate and overheat
Property Faulty Temperature have certain relationship.
In addition, being not that failure can generate at the very start (as being lower than 340 DEG C) when low temperature as can be seen from Figure 3
A large amount of SO2F2+SOF4, but to wait failures that can just start to generate SO after continuing for some time2F2And SOF4, and this
" continuing waiting process " shortens as the temperature rises, and when possible cause is due to low temperature, fault point can't wink
Between to provide enough energy enough for generating SO to generate2F2And SOF4Required activating substance, only as generation SO2F2
And SOF4SO can be just generated after required activating substance accumulation to a certain extent2F2And SOF4, i.e., to wait failures to continue for some time
It can just start to generate SO later2F2And SOF4。
Therefore, when Superheated steam drier temperature is 260 DEG C~500 DEG C, SF6Decomposition can generate a certain amount of SO2F2With
SOF4, there is certain positive correlations with Superheated steam drier temperature for generating rate, so, SO2F2And SOF4Component can be made
To characterize SF6Cross thermal decomposition and SF6A kind of feature product of gas-insulated equipment Superheated steam drier.
Embodiment 2, SOF2 component characteristic；
Fig. 4 and Fig. 5 show SF6Make in hot-spot failure (Partial Overthermal Fault, POF) POF
Decompose SOF generated under2Content and the relation curve between Faulty Temperature and fault time.With SO2F2And SOF4
Both decomposition components are compared, under POF state, SOF2Production quantity obviously than SO2F2And SOF4Production quantity it is much more,
Want high 1~2 order of magnitude, but the relationship between its production quantity and POF temperature, but with SO2F2And SOF4Both decomposition components phases
It seemingly, is all as the raising of POF temperature increases into exponential form.
Under POF state, SOF2Formation characteristic it is as follows:
(1)SF6A large amount of SOF can be generated by decomposing under POF effect2, and be 260 DEG C~500 DEG C in POF Faulty Temperature
When, SOF2Synthesis speed there is extremely strong positive correlations with POF temperature.Be embodied in when temperature is lower (260 DEG C~
320 DEG C) increase it is more slow, within 10 hour fault time, SOF2Ultimate density is within 100ppm, but with POF temperature
When the continuous raising (>=340 DEG C) of degree, generating rate increases with the raising of POF into exponential form, SOF2Ultimate density
It can achieve 4201.55ppm or so, as shown in Figure 4.
(2) as one timing of POF temperature, SOF2Content be continuously increased with the extension of POF fault time, show SF6?
It is decomposed under the continuous action of POF continuous always, and generates a large amount of SOF2。
(3) in 10 hour fault time section, SOF2Generating rate there is no with fault time extension and slow down,
There are no so-called " saturation trend " occur.
(4)SF6SOF is generated under different temperatures POF effect2Production quantity and generating rate distinguish obvious, and itself and POF
Temperature has extremely strong positive correlation.
It therefore deduces that: when Superheated steam drier temperature is 260 DEG C~500 DEG C, SF6It can decompose and generate a large amount of
SOF2, and SOF2It is SF6One of most important decomposition product, SO is much larger than in gas production2F2And SOF4Both decomposition groups
Point.Meanwhile Superheated steam drier temperature is to SOF2Formation it is most important, SOF under different temperatures2Synthesis speed distinguish it is obvious, and
Its generating rate and Superheated steam drier temperature show good positive correlation, this illustrates SOF2Gas can in this temperature range
Using as characterization SF6Gas superheat is decomposed and SF6The main feature decomposition of one of air insulating device Superheated steam drier temperature produces
Object.
Embodiment 3, SO2 component characteristic；
Fig. 6 and Fig. 7 show SF6It is decomposed in the case where Faulty Temperature is the POF effect in 260 DEG C~500 DEG C and generates SO2Spy
Linearity curve.By Fig. 6 and Fig. 7 it can be seen that
(1) within the scope of the Faulty Temperature, SF6SO can be generated by decomposing2, content is in the extension of time
Reveal different degrees of growth trend, and when Faulty Temperature is higher than 340 DEG C, SO2Content rate of rise being increased with index sharply
Long form increases.
(2) under the identical Superheated steam drier time, with aforementioned several main decomposition product such as SOF2、SO2F2And SOF4One
Sample, SO2Generating rate and Superheated steam drier temperature show stronger positive correlation, i.e. temperature is higher, SO2Generation speed
Rate is higher.
(3) from the point of view of production quantity, within the scope of 340 DEG C and following temperature, SO2Content the comparison of the growth is slow, up to
100ppmv or so, but as the temperature rises, SO2Growth rate sharply promoted, at 400 DEG C, maximum value be can achieve
360ppm or so, especially when temperature is higher than 420 DEG C, there is a greatly leap in production quantity, reaches
6703ppm, in the later period, with the continuous improvement of Faulty Temperature, production quantity is increased rapidly, and when to 500 DEG C, production quantity is small 10
When it is interior just reached 23889ppm, date SF6The 2.4% of gas gross is far longer than other the various decomposition components detected
Concentration.This explanation works as SF6When POF occurs for gas-insulated equipment, especially under high temperature POF effect, dielectric SF6It will
Decomposition sharply occurs, about 2% effect will be decomposed in 10 hours, this will be to SF6The safe operation band of gas-insulated equipment
Carry out very fatal threat.
Therefore, when Superheated steam drier temperature is 260 DEG C~500 DEG C, SO2It is equally SF6It decomposes generated one kind
One of extremely important decomposition product, and its gas production is greater than other various decomposition productions when POF Faulty Temperature is higher than 400 DEG C
Object, this illustrates SO2It is likely to SF6One of most important decomposition product in the case where crossing thermal decomposition.POF temperature is to SO2Formation influence
Significantly, and on the whole such a rule is equally presented: temperature is higher, SO2Synthesis speed it is faster.So SO2Contain
Amount and its generating rate can be used as a kind of characterization SF6Gas superheat is decomposed and SF6The main feature amount of gas-insulated equipment POF.
Meanwhile SO2Gas is that a kind of especially huge sour gas of environmental pollution and a kind of pair of human respiratory damage are special
Big gas should be noted that when maintenance and fault diagnosis at the scene.
Embodiment 4, H2S component characteristic；
Fig. 8 and Fig. 9 is shown in POF temperature within the scope of 260 DEG C~500 DEG C, SF6Decompose H generated2S concentration
With the variation tendency of fault time.From Fig. 8 and Fig. 9:
(1)SF6It is not to decompose all generate H under the conditions of all POF2S.340 DEG C and following temperature generation point
Without generating H in solution2S, H can just be generated by decomposing under the conditions of 360 DEG C or higher temperature2S, therefore, H2S is characterization POF temperature
The feature decomposition product of height or the extremely key of POF severity one.
(2) at 360 DEG C~500 DEG C, H2The concentration of S is in raising trend with the extension of trouble duration, and it is given birth to
At rate being positively correlated property same as fault point temperature, and H at a temperature of different faults2The production quantity of S has apparent discrimination,
As shown in Figure 8.
It (3) is in 360 DEG C~500 DEG C, when one timing of Faulty Temperature, with the extension of fault time, H in POF temperature2S
Production quantity constantly slowing down, have the tendency that gradually tending to saturation, as shown in Figure 9.Therefore, H2The content and its generating rate of S
It is a characterization SF6Gas-insulated equips the key feature amount of serious POF, should cause when maintenance and fault diagnosis at the scene especially
Concern.
Embodiment 5, CF4 component characteristic；
SF6It decomposes under POF effect and generates CF4Characteristic curve it is as shown in Figure 10 and Figure 11.CF4The source master of middle C
It to be two, i.e. organic solid insulating materials and SF6Carbon containing metal material surface in gas-insulated equipment.Due in the experiment
Cheng Zhong is not involved with organic solid insulating materials, so CF4Exist from POF insulation defect model surface stainless steel material
The C and SF of the activated state generated under high temperature action6The F atom of cracking combines.
By the analysis to Figure 10 and Figure 11 it is found that SF6CF is generated under POF effect4With following rule:
(1) when POF is not involved with organic solid insulating materials, CF4It is not once SF6Gas-insulated equipment occurs
It will generate, just will appear when must reache a certain level (higher than about 400 DEG C) in Faulty Temperature a small amount of when POF
CF4；
(2) when start generate CF4When, CF4Generating rate can be increased with the raising of POF Faulty Temperature, especially work as
When Faulty Temperature is higher than 440 DEG C, CF4Yield can steeply rise, as shown in Figure 10；
(3) when one timing of Faulty Temperature, with the lasting progress of failure, SF6The activated state F atom of cracking can be made with high temperature
It is constantly combined with the C atom of lower POF physical imperfection model surface and generates CF4, and POF failure is more serious (temperature is higher),
The rate of generation is also bigger；
(4) within 10 hour fault time, CF4Content not because failure it is lasting due to there is saturation trend.
Therefore, CF4It is SF6Superheated steam drier the latter decomposition product to a certain extent, and temperature occur in air insulating device
Spending the formation on it influences significantly, and temperature raising will lead to CF4Generating rate obviously accelerate, can as characterization SF6Gas
A feature product of degradation of the interior carbon containing metal material under POF effect is equipped in insulation.
As the above analysis, in all kinds of Superheated steam driers, it will lead to SF6Gas is decomposed, and is generated
SOF2、SO2、SO2F2、SOF4And CO2Etc. features product can be adjoint and after Faulty Temperature reaches a certain level and (is approximately higher than 350 DEG C)
Generate a certain amount of H2S；When failure is related to organic solid insulating materials, a large amount of CF can be also generated simultaneously4.So can be with
Related component Characteristic Ratios are constructed accordingly, for characterizing the severity and its development trend of Superheated steam drier.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (5)
1. a kind of sulfur hexafluoride resolution characteristic test method at a temperature of different Superheated steam driers, which is characterized in that the method
Steps are as follows:
S1: the air-tightness of sealed gas chamber in joint test system and inspection system；
S2: carrying out the cleaning of sealed gas chamber, will decompose after sealed gas chamber vacuumizes and is filled with the new gas of SF6, is then vacuumized again,
It repeats this process 3 times；
S3: it sets required simulated failure temperature value and is tested；
S4: taking SF6 decomposition components sample gas from gas production mouth, carries out quantitative analysis to sample component.
2. sulfur hexafluoride as described in claim 1 resolution characteristic test method, feature at a temperature of different Superheated steam driers
It is, checks that the air-tightness of sealed gas chamber has specifically included in the step S1:
S11: each functional component of joint test system；
S12: it is vacuumized with vacuum pump to sealed gas chamber is decomposed, closes vacuum pump when the indoor vacuum degree of gas is 0.005MPa；
S13: 10~12 hours are stood；
S14: judge whether the pressure vacuum gauge registration after standing is maintained at 0.005~0.006MPa；If so, showing overheat point
The airtight performance for solving sealed gas chamber is intact；Conversely, then showing that the airtight performance for thermally decomposing sealed gas chamber was not intact.
3. sulfur hexafluoride as described in claim 1 resolution characteristic test method, feature at a temperature of different Superheated steam driers
It is, since overheat sealed gas chamber will not only bear positive pressure during the test, still suffers from the effect of negative pressure, therefore,
A) make the used time when sealed gas chamber bears interior pressure, overheat sealed gas chamber wall thickness SiIt should meet:
In formula, SiFor the wall thickness for overheating sealed gas chamber；P is limit allowable specific pressure；D is the cavity diameter of sealed gas chamber；C is additional
Thickness, C take 0.005~0.01m；σ is the allowable stress of material, calculating formula are as follows:
In formula, σbRepresent material standard tensile strength lower limit value；σsRepresent material standard room temperature yield point；nbRepresent tensile strength
Safety coefficient；nsIndicate the safety coefficient of yield point；
B) when sealed gas chamber bears external pressure, the wall thickness S of sealed gas chamber0It should meet:
In formula, S0For the wall thickness of the sealed gas chamber in the case where external pressure acts on；Pa is that critical external pressure is strong；D is that the cavity of sealed gas chamber is straight
Diameter；E is the elasticity modulus of material, and E takes 172~200GPa.
4. sulfur hexafluoride as described in claim 1 resolution characteristic test method, feature at a temperature of different Superheated steam driers
It is, the quantitative analysis in the step S4 includes:
The quality mi of fractions tested i or its concentration c i in the sample are directly proportional to the response of detector, fundamental formular are as follows:
mi=fi×Ai(4)；
Wherein, fiFor the response factor of component i；
Quantitative calculation formula is as follows:
In formula, Ai、As,iRespectively sample, i-th group of component gas peak area in standard specimen；ci、cs,iRespectively sample, i-th in standard specimen
Group component gas content；Ki is the slope i.e. Absolute Calibration factor of calibration curve.
5. sulfur hexafluoride as described in claim 1 resolution characteristic test method, feature at a temperature of different Superheated steam driers
It is, includes in the sulfur hexafluoride decomposition product: SO2、SOF2、SOF4、SO2F2、CF4And H2S。
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