CN108181576A - The determining method of 1100kV wave filters column type circuit breaker connecting-disconnecting function - Google Patents
The determining method of 1100kV wave filters column type circuit breaker connecting-disconnecting function Download PDFInfo
- Publication number
- CN108181576A CN108181576A CN201711297798.0A CN201711297798A CN108181576A CN 108181576 A CN108181576 A CN 108181576A CN 201711297798 A CN201711297798 A CN 201711297798A CN 108181576 A CN108181576 A CN 108181576A
- Authority
- CN
- China
- Prior art keywords
- column type
- type circuit
- circuit breaker
- concentration
- wave filters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
Abstract
The present invention discloses a kind of 1100kV wave filters and determines method with column type circuit breaker arc-chutes connecting-disconnecting function, including：S101, the detectable concentration and limting concentration for obtaining carbon tetrafluoride in the 1100kV wave filters column type circuit breaker；S102, according to the detectable concentration and the limting concentration, determine the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker；Wherein, the detectable concentration is the concentration of the corresponding carbon tetrafluoride of the current opening/closing frequency of 1100kV wave filters column type circuit breaker, and the limting concentration is the concentration of the corresponding carbon tetrafluoride of the 1100kV wave filters column type circuit breaker limit opening/closing frequency.The present invention can quickly determine the working condition of 1100kV wave filter column type circuit breakers according to the concentration of the carbon tetrafluoride generated in breaker, so as to which reliable basis is established in the safe operation of Quick overhaul, extra-high voltage grid for 1100kV wave filters column type circuit breaker.
Description
Technical field
The invention belongs to technical field of electricity more particularly to a kind of 1100kV wave filters to be cut-off with column type circuit breaker arc-chutes
The determining method of ability.
Background technology
With the development of Chinese extra-high voltage grid, to meet following extra-high voltage grid construction demand, the filter of 1100kV/63kA
Wave device is come into being with column type circuit breaker, due to 1100kV/63kA wave filter with column type circuit breaker be extra-high voltage grid run
Key equipment, therefore its reliability is related to the operational safety of entire extra-high voltage grid.
Extra-high voltage grid is transported caused by occurring to be broken down with column type circuit breaker due to the wave filter of 1100kV/63kA
When row is abnormal, service personnel generally requires to carry out investigation repair, usual nothing with the relevant equipment of extra-high voltage grid operation to all
Method quickly navigates to the wave filter column type circuit breaker of 1100kV/63kA, can not only waste a large amount of manpower and materials, can also cause spy
The operation exception of high-voltage fence long period influences normal orders of life.
Therefore how quickly to judge the working condition of the wave filter column type circuit breaker of 1100kV/63kA and having
The maintenance to it is completed before being likely to occur failure, under the premise of not wasting manpower and material resources, ensures that extra-high voltage grid is transported safely
Row, is this field urgent problem to be solved.
Invention content
The purpose of the present invention is to provide a kind of determining for 1100kV wave filters column type circuit breaker arc-chutes connecting-disconnecting function
Method is the safety fortune of extra-high voltage grid for quickly determining the working condition of current 1100kV wave filters column type circuit breaker
Row lays the foundation.
To achieve these goals, the present invention adopts the following technical scheme that：
1100kV wave filters determine method with column type circuit breaker arc-chutes connecting-disconnecting function, include the following steps：
S101, the detectable concentration and limting concentration for obtaining carbon tetrafluoride in the 1100kV wave filters column type circuit breaker；
S102, according to the detectable concentration and the limting concentration, determine the 1100kV wave filters column type circuit breaker
Connecting-disconnecting function；
Wherein, the detectable concentration is the corresponding tetrafluoro of the current opening/closing frequency of 1100kV wave filters column type circuit breaker
Change the concentration of carbon, the limting concentration is the corresponding tetrafluoride of the 1100kV wave filters column type circuit breaker limit opening/closing frequency
The concentration of carbon.
Further, according to the detectable concentration and the limting concentration, determine that the 1100kV wave filters pillar is broken
The connecting-disconnecting function of road device, including：
Judge whether the detectable concentration is more than or equal to the limting concentration,
If so, the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker is abnormal；
If it is not, then the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker is normal.
Further, if the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker is normal, according to theoretical folding time
The secondary limting concentration of number and carbon tetrafluoride evaluates the detection cycle of the 1100kV wave filters column type circuit breaker；If the reason
30% and the detectable concentration for being more than theoretical opening/closing frequency by the difference of opening/closing frequency and current opening/closing frequency are more than the tetrafluoro
Change the secondary limting concentration of carbon, then shorten the detection cycle of the 1100kV wave filters column type circuit breaker；
Wherein, 60%-90% of the secondary limting concentration for the limting concentration of the carbon tetrafluoride.
Further, the detectable concentration of carbon tetrafluoride in the 1100kV wave filters column type circuit breaker is obtained, it is specific to wrap
It includes：
1) 1100kV wave filters are taken by the use of gas in column type circuit breaker as sample to be tested；Sample to be tested is injected into gas phase color
In spectrum-level four bars flight time tandem mass spectrum combined instrument, CF in sample to be tested is obtained4Peak area in chromatography of ions figure；
2) according to chromatography external standard method, step 1) is obtained into peak area and CF4The standard curve of standard items compares, and obtains
CF in surveyed 1100kV wave filters column type circuit breaker4Detectable concentration.
Further, step 2) includes：The peak area is substituted into the CF4In the calibration curve equation of standard items, meter
Calculation obtains CF in the sample to be tested4Content.
Further, CF4Calibration curve equation is according to CF4Standard items are established；CF4Calibration curve equation is：
Y=10910x+0.0055 formulas 1
In formula 1, y represents the difference of the peak area of standard sample and blank sample, and x represents CF4Content, unit is μ L/L.
Further, in the gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, mass spectrographic operating condition is
Ion source is electron impact ion source, and electron energy 70eV, ion source temperature is 230 DEG C, and transmission line temperature is 250 DEG C, matter
Measuring scanning range is：32-500amu, quantitative model are selected ion monitoring pattern.
Further, in the gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, the work item of gas-chromatography
Part is as carrier gas using helium, and the helium flow velocity is 1.5mL/min；The temperature-rise period of the gas-chromatography is：At 50 DEG C
5min is kept the temperature, 10min is kept the temperature at 200 DEG C, and heating rate is 10 DEG C/min；Split ratio is 20:1；Gas chromatographic column is
GASPro0.32mm×60m。
Further, the sample size of the sample to be tested is 250 μ L.
Relative to the prior art, the invention has the advantages that：
The 1100kV wave filters provided by the invention determining method of column type circuit breaker arc-chutes connecting-disconnecting function, being capable of basis
The concentration of the carbon tetrafluoride generated in breaker quickly determines the working condition of 1100kV wave filter column type circuit breakers, so as to for
The safe operation of the Quick overhaul, extra-high voltage grid of 1100kV wave filters column type circuit breaker establishes reliable basis, while can also
Enough judge the accuracy of the detection cycle of current breaker, provided for each breaker adaptability and more meet work at present shape
The detection cycle of state has guiding significance to the maintenance of 1100kV wave filter column type circuit breakers.
Description of the drawings
Fig. 1 is the stream of the determining embodiment of the method for 1100kV wave filters column type circuit breaker arc-chutes connecting-disconnecting function of the present invention
Cheng Tu；
Curve in Fig. 2 is followed successively by the CF in 1-7 gas bottles from the bottom to top4Calibrating gas selective ion stream
Figure；
Fig. 3 is CF of the embodiment of the present invention4The canonical plotting of calibrating gas.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
It is such as not particularly illustrated, " breaker " in the description below is " 1100kV wave filters column type circuit breaker ".
The present invention judges the working condition of breaker by the concentration of carbon tetrafluoride, the reason is as follows that：1100kV columns
Formula breaker is in "on" position, and with arcing contact all in connection status, electric current circulates main contact substantially across main contact.When point
From when electric current be transferred on arcing contact and circulate by main contact, the SF in air cylinder6Gas starts to be compressed, and its nozzle does not have also
It is opened, this stage can be described as the stage of calming the anger.The dynamic and static arcing contact time of releasing generates electric arc, with moving contact and movement
System continues to move downward, the high pressure SF in air cylinder6The moment that gas blows to dynamic/static contact separation generates high energy arc, works as electricity
After orphan extinguishes, moving contact and kinematic system continue to move to open position.
Breaker SF when electric arc is cut-off6Gas may decompose.Arc current range is typical from several kA to tens kA
Arc time is 10~20ms, and discharge energy is 105To 107Between J, arc center's temperature can reach 20000K.Electric arc generates
When, dynamic and static striking contact both ends electric current is equal, high energy electron siltation occurs, is radiated in the form of high energy electron, and electronics is high
Degree aggregation, carries higher energy, can reach 106A/cm2.C2 grades of experiments are that short arcing is cut-off, the indoor sulfur hexafluoride of arc extinguishing
High energy particle can be generated by being excited by high energy arc, these high energy particles act on arc-chutes dynamic/static contact metallic conductor and absolutely
On edge spout, and mixing material of the spout for boron nitride and polytetrafluoroethylene (PTFE) that insulate, therefore, when insulation spout encounters carbon hexa fluoride
During the high-energy particle flow that decomposed generates, the chemical bond in polytetrafluoroethylene material in the spout that insulate can be broken and again
It builds, as the result of the increasing action of test number (TN) is more apparent.CF can be generated according to theory analysis4、C2F6、C3F8Wait carbon fluorides
With sulphur fluoride and carbon particle.
By to the SF after closing and cut-offfing6It is found after gas detection, carbon fluoride only has CF4Concentration changes,
C2F6、C3F8Concentration does not change, and reaction equation should be
It is very rapid to switch separation process, it is desirable that there is high pressure gas supersonic speed to blow over spout：On the one hand by insulated tension pole
Power determine；On the other hand it is decided by the shape of spout, is ensureing SF needed for arc extinguishing6Under the premise of gas is enough, spout
The pressure of the smaller gas of throat is bigger, speed is faster.If with damage of the electric arc to spout, throat can be become larger, SF6Gas
Pressure declines, and arc extinguishing ability is caused to decline, endangers equipment safety operation.
The experiment that the equipment carries out is the platform built according to the condition of onsite application, and inside is placed with sorbent material.
Therefore in trace impurity mutation analysis in entire moving process, it is considered as the effect of adsorbent.Sulfur-bearing class compound concentration
Decline comparatively fast, it is less apparent for permanent gases and the variation of carbon fluorine class.Therefore comprehensive analysis, CF4Concentration variation can be intuitive
Reflection equipment folding situation.
In addition, being found after disintegrating after breaker works a period of time to it, quiet striking contact ablation is apparent, surface hair
It is black；Also there is apparent ablation, surface color variation in polytetrafluoroethylene (PTFE) spout.So as to confirm the detection of decomposition product carbon tetrafluoride
The correctness of validity and theory analysis.
Fig. 1 is the stream of the determining embodiment of the method for 1100kV wave filters column type circuit breaker arc-chutes connecting-disconnecting function of the present invention
Cheng Tu.As shown in Figure 1, a kind of determining method of 1100kV wave filters column type circuit breaker arc-chutes connecting-disconnecting function of the present invention, packet
Include following steps：
S101：Obtain the detectable concentration of carbon tetrafluoride and the tetrafluoride in the 1100kV wave filters column type circuit breaker
The limting concentration of carbon.
Wherein, detectable concentration is the dense of the corresponding carbon tetrafluoride of the current opening/closing frequency of 1100kV wave filter column type circuit breakers
Degree, limting concentration is to state the concentration of the corresponding carbon tetrafluoride of 1100kV wave filter column type circuit breaker limit opening/closing frequencies.Herein
Opening/closing frequency refer to the folding of dynamic/static contact during the work time in the arc-chutes of 1100kV wave filter column type circuit breakers
Number, current opening/closing frequency refer to the opening/closing frequency of dynamic/static contact when 1100kV wave filters are run instantly with column type circuit breaker, pole
Limit opening/closing frequency refers to that 1100kV wave filters column type circuit breaker 1100kV wave filter pillars of producer's setting in manufacture are broken
What road device life parameter or those skilled in the art obtained according to the use experience of the 1100kV wave filter column type circuit breakers
Life parameter, i.e., when the opening/closing frequency of dynamic/static contact is equal to limit opening/closing frequency, 1100kV wave filters are reached with column type circuit breaker
It can not work on to working limit.It should be noted that current opening/closing frequency is less than limit opening/closing frequency.
When 1100kV wave filters are run with column type circuit breaker, the folding of dynamic/static contact can generate electric arc, arc-chutes moment
Interior sulfur hexafluoride excites generation electron transition by electric arc, and high energy particle can mainly be acted on by the form of light and heat at this time
On the metallic conductor and insulation spout of arc-chutes dynamic/static contact, wherein, mixing of the insulation spout for boron nitride and polytetrafluoroethylene (PTFE)
Material, when the spout that insulate is by high-energy radiation, sulfur hexafluoride can be with the mixing material of boron nitride and polytetrafluoroethylene (PTFE)
Learning reaction makes its chemical bond that can be broken, so as to generate a large amount of carbon tetrafluoride.Therefore, break in 1100kV wave filter pillars
Carbon tetrafluoride, reaction mechanism such as following formula 1 can be generated in the device course of work of road：
It can be when 1100kV wave filters be currently run with column type circuit breaker, by taking detection sample then right in equipment
Carbon tetrafluoride in detection sample is detected to obtain detectable concentration；Artificial to 1100kV wave filter column type circuit breakers
After folding threshold number, by taking detection sample in equipment and then the carbon tetrafluoride in detection sample being detected to obtain
Obtain limting concentration.
S102：According to detectable concentration and limting concentration, the connecting-disconnecting function of 1100kV wave filter column type circuit breakers is determined.
Under breaker normal operating condition, when dynamic/static contact electric arc is cut-off, the SF in arc-chutes6Gas can occur point
Solution, arc current range is from several kA to tens kA, and the typical arc time is 10~20ms, and discharge energy is 105To 107Between J,
Arc center's temperature can reach 20000K, since the arc time is short, arc energy is big, by the polytetrafluoroethylene (PTFE) meeting of high-energy radiation
Parallel off occurs, generates a large amount of low-carbon fluoride and carbon simple substance.It is found after disintegration, quiet striking contact ablation is apparent, surface hair
It is black；Also there is apparent ablation in polytetrafluoroethylene (PTFE) spout, and surface color deepens, therefore can judge to work as according to the concentration of carbon tetrafluoride
The working condition of preceding breaker, and the concentration of carbon tetrafluoride is higher, and the opening/closing frequency of breaker is more, and the working time is more long,
The probability that working state of circuit breaker goes wrong is bigger.
The present invention is according to the concentration of the carbon tetrafluoride generated in the breaker course of work and the limting concentration of carbon tetrafluoride
The working condition of quick determining breaker, avoids the investigation to device each in breaker, is the safety fortune of extra-high voltage grid
Row lays the foundation.Specifically, the connecting-disconnecting function of breaker refers to the state of arc-chutes spout and contact in breaker.
S102 is specifically included：Judge whether detectable concentration is more than or equal to limting concentration, if so, 1100kV wave filter columns
The connecting-disconnecting function of formula breaker is abnormal；If it is not, then the connecting-disconnecting function of 1100kV wave filters column type circuit breaker is normal.
By comparing the magnitude relationship between detectable concentration and limting concentration, the work of current breaker can be quickly determined
Whether state is normal.When detectable concentration is more than limting concentration, then there is exception in the working condition of breaker at this time, needs in time
Repair is arranged, ensures the operational safety of equipment；When detectable concentration is less than limting concentration, then the working condition of breaker is being just at this time
Often, it does not break down.
When detectable concentration is less than limting concentration, although the working condition of breaker is normal instantly, with breaker
Continue to run with, it is most likely that occur abnormal, generally, breaker can all have fixed detection cycle, service personnel understands basis
Breaker is overhauled in detection cycle timing, avoids just being repaired when breaker occurs abnormal.But due to each
The difference of 1100kV/63kA wave filters column type circuit breaker working environment, fixed detection cycle are difficult to meet all 1100kV/
The need of work of 63kA wave filter column type circuit breakers, often there arises a problem that：Between two detection cycles,
1100kV/63kA wave filters are broken down with column type circuit breaker, so as to cause the non-security operation of extra-high voltage grid and,
When detection cycle overhauls 1100kV/63kA wave filters with column type circuit breaker, the pillar open circuit of 1100kV/63kA wave filters
It is good inside device, wasting manpower and material resources.Therefore, when in S102, judging breaker work less than limting concentration according to detectable concentration
Make state it is normal when, the detection cycle of breaker can also be evaluated, that is, evaluate breaker the fixed test period whether
It is matched with the breaker under current opening/closing frequency.
The detection cycle for specifically evaluating the 1100kV wave filters column type circuit breaker includes：According to theoretical opening/closing frequency and
The secondary limting concentration of the carbon tetrafluoride evaluates the detection cycle of the 1100kV wave filters column type circuit breaker.
Wherein, secondary limting concentration for carbon tetrafluoride limting concentration 65%, such as limting concentration be 1000 μ L/L when, then
Secondary limting concentration is 600-800 μ L/L.
Theoretical opening/closing frequency can pass through the equation calculation of detectable concentration-opening/closing frequency of current carbon tetrafluoride.Specifically,
The equation of detectable concentration-opening/closing frequency of current carbon tetrafluoride is by by current opening/closing frequency and corresponding detection tetrafluoride
The linear equation that the N group data of the concentration of carbon are built after curve and obtained to curve matching.In the detection for establishing current carbon tetrafluoride
After the equation of concentration-opening/closing frequency, detectable concentration is brought into the equation, can obtain theoretical opening/closing frequency.
If the difference of theory opening/closing frequency and the current opening/closing frequency is more than the 30% of theory opening/closing frequency and described
Detectable concentration is more than the secondary limting concentration of the carbon tetrafluoride, then shortens the detection of the 1100kV wave filters column type circuit breaker
Period.
That is, when detectable concentration is more than time limting concentration and less than limting concentration, and theoretical opening/closing frequency with it is described current
When the difference of opening/closing frequency is more than the 30% of theoretical opening/closing frequency, shorten the detection cycle of breaker.It that is, should adaptability
Shorten the fixed detection cycle of breaker, increase the repair rate of breaker.For example, if the fixed test period of breaker is
June is primary, after detectable concentration and current opening/closing frequency meet above-mentioned condition, can be adjusted to detection cycle bimonthly.
It is understood that above-mentioned two condition (detectable concentration be more than time limting concentration and less than limting concentration and, reason
It is more than by the difference of opening/closing frequency and the current opening/closing frequency and theoretical closes the 30% of number) to meeting one or be all unsatisfactory for
When, it original detection cycle can be continued to does not do change.
The present invention does not limit the specific detection method of carbon tetrafluoride concentration, but due to the pillar open circuit of 1100kV wave filters
The characteristics of device, that is, 1100kV wave filters are big with column type circuit breaker equipment volume, arc-chutes at the top of equipment with air hatch distance compared with
Far, the concentration of the unit volume of decomposition product is relatively low, therefore with certain detection difficulty.Based on this, gas may be used in the present invention
Method associated with matter is detected 1100kV wave filters with carbon tetrafluoride concentration in column type circuit breaker, wherein level four bars flight when
Between tandem mass spectrometer can effectively improve Detection capability to carbon tetrafluoride in sample to be tested.Specifically, sample to be tested is injected
In gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, obtain it is described detection sample in carbon tetrafluoride in ion chromatography
Peak area in figure；According to chromatography external standard method, the standard curve of the peak area and carbon tetrafluoride standard items is compared, is obtained
Obtain the detectable concentration of carbon tetrafluoride in the sample to be tested.
Signified sample to be tested is taken in 1100kV wave filter column type circuit breakers in the present invention, in 1100kV wave filters
When being run with column type circuit breaker, the time of releasing of dynamic/static contact generates electric arc, and the indoor sulfur hexafluoride of arc extinguishing is excited by electric arc
Electron transition is generated, high energy particle can mainly act on the metallic conductor of arc-chutes dynamic/static contact by the form of light and heat at this time
On insulation spout, wherein, mixing material of the insulation spout for boron nitride and polytetrafluoroethylene (PTFE), when insulation spout is by high energy spoke
When penetrating, with the mixing material of boron nitride and polytetrafluoroethylene (PTFE) chemical reaction, which can occur, for carbon hexa fluoride makes its chemical bond that can break
It splits, so as to generate a large amount of carbon tetrafluoride.In addition, breaker can also generate hexafluoroethane, sulfur dioxide, fluorination thionyl etc..
Therefore, in the sample to be tested obtained in arc-chutes, not only include carbon tetrafluoride to be measured, also hexafluoroethane, titanium dioxide
Sulphur, fluorination thionyl and other chemical substances.In addition, since 1100kV wave filters are big with column type circuit breaker equipment volume, go out
Arc chamber is distant with air hatch at the top of equipment, and the concentration of the unit volume of decomposition product is relatively low.Therefore, how accurately to obtain
In 1100kV wave filter column type circuit breakers the concentration of carbon tetrafluoride be equally the present invention specifically addresses the technical issues of.
Specific sampling can be connected by sampling bottle with 1100kV wave filters with the inflatable interface on column type circuit breaker, due to
The reason of draught head, so as to which gas be made to enter in sampling bottle.
After completing aforesaid operations, 40 DEG C are heated in heating function built in sampling bottle, analysis, prevents decomposition product from adsorbing.
Sampling bottle is connected with the injection port in gas-chromatography-level four bars flight time tandem mass spectrum combined instrument by needle-valve and pipeline,
The sample to be tested in sampling bottle is made to be directly entered in combined instrument, it, can be by being installed in injection port for the ease of controlling sample size
Quantitative loop makes sample to be tested enter in combined instrument by quantitative loop under normal pressure, and it is 250 μ L to select injection annulus according to chromatographic column.
When the above-mentioned implant operation of sample to be tested completion, it is combined by injection gas-chromatography-level four bars flight time tandem mass spectrum
After instrument, it can enter in gas chromatograph first, under certain GC conditions, due to component each in sample to be tested and color
Active force between spectrum column has difference, therefore the velocity of liquid assets of each component in the chromatography column is just different, the work in sample to be tested
Firmly weaker component can be parsed first by chromatographic column, thus with the progress of time, each component in sample to be tested will lead to
Cross gas chromatograph separation.
Along with separation of the gas-chromatography to component each in sample to be tested, the component isolated at first can be introduced into level Four
In bar flight time tandem mass spectrometer, under certain Mass Spectrometry Conditions, each component by ion source bombard generate fragment, finally by
Mass analyzer and detector obtain the mass-to-charge ratio of fragment ion, judge that molecule is formed by the mass-to-charge ratio of fragment ion, complete
Qualitative progress.Specifically, CF4Characteristic ion fragment charge-mass ratio be 68.99.
By the above-mentioned analysis to sample to be tested, gas-chromatography-level four bars flight time tandem mass spectrum combined instrument can export
The gas chromatography mass spectrometry spectrogram of sample to be tested, gas chromatography mass spectrometry spectrogram can show the peak area of each component in sample to be tested, including
The peak area of carbon tetrafluoride in sample to be tested.Peak area can reflect content of the carbon tetrafluoride in sample to be tested, that is, tetrafluoride
The peak area of carbon is bigger, and content of the carbon tetrafluoride in sample to be tested is higher.But peak area can not reflect that carbon tetrafluoride exists
Actual concentrations in sample to be tested, therefore can be by chromatography external standard method, by the peak area and carbon tetrafluoride standard items
Standard curve compare, calculate actual concentrations of the carbon tetrafluoride in sample to be tested.
Chromatography external standard method refers to by the peak area of sample to be tested compared with the standard curve of sample to be tested standard items,
The peak area of sample to be tested is found on standard curve, so as to obtain the concentration of sample to be tested corresponding with the peak area of sample to be tested
Value, wherein the CF that it is 99.999% that standard items to be measured, which are purity,4(the sample to be tested standard items that use are calibrating gas in the present invention
CF4The standard items of a concentration of 5000 μ L/L), standard curve just refers to the curve of peak area-concentration made according to standard items.One
As, N kinds sample then can be subjected to chromatography point by the way that sample to be tested standard items to be configured to the samples of N kind various concentrations
Analysis, obtains N number of peak area of standard items, so as to obtain standard curve according to N groups peak area-concentration data.Therefore, when
After knowing the peak area of sample to be tested, can the concentration of current sample to be tested be obtained by the comparison on mark curve.
It should be pointed out that the chromatographic condition that N kinds standard sample carries out chromatography must be with the color of acquisition sample to be tested
Spectral condition is identical.
In order to further improve the accuracy of external standard method, standard curve can be initially set up after standard curve is obtained
Calibration curve equation, so as to which sample to be tested is calculated in calibration curve equation by the way that the peak area of sample to be tested is brought into
Concentration.
The present invention is using the method for gas chromatography mass spectrometry to CF in 1100kV wave filter column type circuit breakers4It is qualitative fixed that content carries out
Amount analysis, wherein level four bars flight time tandem mass spectrometer have higher resolution ratio, can be in the background gas of high concentration
In to CF4It carries out reliable qualitative and quantifies, this is not only that non-mass spectrometry method can not compare by the qualitative ability of Matrix effects
Intend, qualitatively reliability is also that Low Resolution Mass Spectra can not be accomplished.
Specifically, in the gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, mass spectrometric operating condition
For：Ion source is electron impact ion source, and electron energy 70eV, ion source temperature is 230 DEG C, and transmission line temperature is 250 DEG C,
Mass scan range (m/z) is：32-500amu, quantitative model are selected ion monitoring pattern (SIM).
Specifically, in the gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, chromatographic operating condition
For：Using helium as carrier gas, the helium flow velocity is 1.5mL/min, and injector temperature is 150 DEG C；The heating of gas-chromatography
Process is：5min is kept the temperature at 50 DEG C, 10min is kept the temperature at 200 DEG C, and heating rate is 10 DEG C/min；Split ratio is 20:1；Gas phase
Chromatographic column is GASPro 0.32mm × 60m.Wherein, since the ionization energy of helium is far above the ionization energy of common compounds,
The ionizing efficiency of helium is relatively lower than general organic compound, small to the interference of total ion current, and helium or inert gas,
Mass spectrogram and total ion current will not be interfered to detect, therefore the present invention selects helium as carrier gas.
In order to verify the detection method of carbon tetrafluoride concentration that is provided in the present invention have feasibility and accuracy so as to
The connecting-disconnecting function and detection cycle of 1100kV wave filters column type circuit breaker can be judged, be carried out by following experiments
Verification.
The gas-chromatography that following experimentations use-level four bars flight time tandem mass spectrum combined instrument is U.S. Agilent
The 7890B-7200QTOF of company's production.
By gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, using the detection method of the present invention to certain public affairs
Take charge of the CF in the arc-chutes of the 1100kV wave filter column type circuit breakers of production4Concentration is detected.
In gas-chromatography-level four bars flight time tandem mass spectrum combined instrument：
Gas chromatograph operating condition is：Using helium as carrier gas, the helium flow velocity is 1.5mL/min；Gas phase color
The temperature-rise period of spectrum is：5min is kept the temperature at 50 DEG C, 10min is kept the temperature at 200 DEG C, and heating rate is 10 DEG C/min；Split ratio is
20:1；Gas chromatographic column is GASPro 0.32mm × 60m.
Mass spectrometric operating condition is：Ion source is electron impact ion source, electron energy 70eV, and ion source temperature is
230 DEG C, transmission line temperature is 250 DEG C, and mass scan range (m/z) is：32-500amu, quantitative model are that selective ion is supervised
Survey pattern (SIM).
Specific detection process includes the following steps：
1) making of standard curve
It purchases with SF6For the CF that solvent gas content is 100 μ L/L and 5000 μ L/L4Calibrating gas is counted by using China
The gas-dynamic distributing instrument of universities and colleges' standard is measured, with SF6Above two calibrating gas is diluted for solvent gas, respectively obtaining content is
10th, the CF of 20,50,100,200,500,1000 μ L/L4Calibrating gas.
By the different CF of above-mentioned 7 kinds of concentration4Calibrating gas be respectively placed in gas bottle, according to concentration from small to large successively
To gas bottle number 1 to 7.
1 to No. 7 gas bottles are butted up against into gas-chromatography-level four bars flight time tandem mass spectrum combined instrument sample introduction by needle-valve
Make sample introduction in the quantitative loop of mouth, wherein, control sample size is 250 μ L.After sample introduction, 1 to 7 are obtained according to above-mentioned instrument operating condition
CF in number gas bottle4Calibrating gas peak area, specific peak area is shown in Table 1.In addition, Fig. 2 is 1 to No. 7 gas collections of the invention
CF in bottle4Calibrating gas selective ion flow graph.Curve in Fig. 2 is followed successively by from the bottom to top in 1 to No. 7 gas bottles
CF4Calibrating gas selective ion flow graph.
Table 1
| Serial number | Concentration (μ L/L) | Peak area |
| 1 | 10 | 107,544 |
| 2 | 20 | 224,954 |
| 3 | 50 | 551,901 |
| 4 | 100 | 1,255,247 |
| 5 | 200 | 2,236,386 |
| 6 | 500 | 5,757,984 |
| 7 | 1000 | 10,861,008 |
CF is drawn according to above-mentioned 7 groups (peak area-concentration) data4The standard curve of calibrating gas, that is, Fig. 3 is the present invention
Embodiment CF4The canonical plotting of calibrating gas recycles drafting instrument to show that the calibration curve equation of standard curve is formula 2.
Fig. 3 is according to the CF that 7 groups of peak area-concentration is worth in table 14The canonical plotting of calibrating gas, solid line are
The curve graph of 2 standard curve equation of formula.
Y=10910x+0.0055 (R2=0.999) formula 2
In formula 2, y represents the difference of the peak area of standard specimen and blank sample, and x represents CF4Concentration, R represents linearly related system
Number.
2) the current opening/closing frequency of 1100kV wave filters column type circuit breaker and the relationship of carbon tetrafluoride concentration
1100kV wave filters are subjected to folding with column type circuit breaker, folding the 123rd, 291,615,723,831,939,
1047th, 1155 times when gas bottle A-P bottlenecks are connected with 1100kV wave filters with column type circuit breaker inflating port respectively, take and treat in right amount
Sample a-p.Gas bottle A-P is butted up against into gas-chromatography-level four bars flight time tandem mass spectrum combined instrument by needle-valve respectively
Make sample introduction in the quantitative loop of injection port, wherein, control sample size is 250 μ L.After sample introduction, obtained according to above-mentioned instrument operating condition
CF in sample to be tested a-p4Peak area.
It brings above-mentioned peak area into formula 2 respectively, CF in sample to be tested a is calculated4Concentration Ca-Cp.So as to obtain folding
Number-CF432 groups of data of concentration make curve graph according to 32 groups of data and fitting obtain curvilinear equation as formula 3：It (adopts every time
Two bottles of samples, every bottle is done 2 groups of data again)
Y=0.57342x-35.32098 (R2=0.993) formula 3
In formula 3, y represents CF4Concentration, x represent opening/closing frequency, and R represents linearly dependent coefficient.
By formula 3 it is found that opening/closing frequency and CF4Concentration is in a linear relationship, with increasing for opening/closing frequency, CF4Concentration becomes larger,
Therefore, it is possible to pass through CF4The variation of concentration judges the working condition of 1100kV wave filter column type circuit breakers.
In order to verify the feasibility and accuracy of above-mentioned carbon tetrafluoride concentration detection method, carried out by following test examples
Verification.
1st, precision is verified
It purchases with SF6For the CF that solvent gas content is 100 μ L/L4Calibrating gas be placed in gas bottle, by the gas collection
Bottle, which is butted up against by needle-valve in the quantitative loop of gas-chromatography-level four bars flight time tandem mass spectrum combined instrument injection port, makes sample introduction,
Wherein, control sample size is 250 μ L.After sample introduction, it is detected according to above-mentioned instrument operating condition and records peak area.Continuously into
Sample 7 times compares 7 peak areas and obtains its RSD less than 5, therefore instrument stabilizer performance is good.Table 2 verifies peak area number for precision
According to table.
Table 2
2nd, reproducibility is verified
The reproduction row of this method is verified in continuous sample introduction 7 times on the different instruments of same model by different people.
Purchase the CF of a concentration of 100 μ L/L4Calibrating gas be placed in gas bottle, the gas bottle is passed through into needle-valve respectively
Butting up against in the quantitative loop of different gas-chromatographies-level four bars flight time tandem mass spectrum combined instrument injection port makes sample introduction, wherein,
Control sample size is 250 μ L.After sample introduction, it is detected according to above-mentioned instrument operating condition and records peak area.Compare 7 secondary peak faces
Product obtains its RSD less than 5, therefore the reproduction of this method is functional.Table 3 verifies peak area tables of data for reproducibility.
Table 3
| Serial number | Peak area |
| 1 | 1255247 |
| 2 | 1268552 |
| 3 | 1238774 |
| 4 | 1258290 |
| 5 | 1249382 |
| 6 | 1253290 |
| 7 | 1276292 |
3rd, mark-on reclaims are verified
After the calibrating gas of 5000 μ L/L for adding in 30ml in the 300mL sampling bottles (being less than 10Pa) for exhausting vacuum, then
Being filled with 100 μ L/L calibrating gas makes absolute pressure in sampling bottle for 0.5MPa, according to the invention detects that CF in sampling bottle4
A concentration of 193.4 μ L/L.
According to calculating, the CF in the sampling bottle4A concentration of 200 μ L/L.
Therefore, detection method of the invention calculates CF4The relative error E=-3.3% of concentration.
By the above method, can obtain as drawn a conclusion：Tetrafluoro in the 1100kV wave filter column type circuit breakers of the present invention
The detection method for changing concentration of carbon is that confidence level is high, can not only fill up as feasible detection method and in the prior art can not
The technological gap of carbon tetrafluoride concentration in accurate detection 1100KV wave filter column type circuit breakers, additionally it is possible to be followed successively by according to preparation
Judge the working condition of 1100kV wave filter column type circuit breakers.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is with reference to the foregoing embodiments described in detail the present invention, it will be understood by those of ordinary skill in the art that：It is still
It can modify to the technical solution recorded in foregoing embodiments and either which part or all technical features are carried out
Equivalent replacement；And it these modifications or replaces, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (9)
1.1100kV wave filters determine method with column type circuit breaker arc-chutes connecting-disconnecting function, which is characterized in that include the following steps：
S101, the detectable concentration and limting concentration for obtaining carbon tetrafluoride in the 1100kV wave filters column type circuit breaker；
S102, according to the detectable concentration and the limting concentration, determine opening for the 1100kV wave filters column type circuit breaker
Cutting capacity；
Wherein, the detectable concentration is the corresponding carbon tetrafluoride of the current opening/closing frequency of 1100kV wave filters column type circuit breaker
Concentration, the limting concentration is the corresponding carbon tetrafluoride of the 1100kV wave filters column type circuit breaker limit opening/closing frequency
Concentration.
2. the 1100kV wave filters according to claim 1 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, according to the detectable concentration and the limting concentration, determines opening for the 1100kV wave filters column type circuit breaker
Cutting capacity, including：
Judge whether the detectable concentration is more than or equal to the limting concentration,
If so, the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker is abnormal；
If it is not, then the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker is normal.
3. the 1100kV wave filters according to claim 2 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, if the connecting-disconnecting function of the 1100kV wave filters column type circuit breaker is normal, according to theoretical opening/closing frequency and tetrafluoro
Change the secondary limting concentration of carbon, evaluate the detection cycle of the 1100kV wave filters column type circuit breaker；If the theory folding time
30% and the detectable concentration that the difference of number and current opening/closing frequency is more than theoretical opening/closing frequency are more than the secondary of the carbon tetrafluoride
Limting concentration then shortens the detection cycle of the 1100kV wave filters column type circuit breaker；
Wherein, 60%-90% of the secondary limting concentration for the limting concentration of the carbon tetrafluoride.
4. the 1100kV wave filters according to claim 1 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, obtains the detectable concentration of carbon tetrafluoride in the 1100kV wave filters column type circuit breaker, specifically include：
1) 1100kV wave filters are taken by the use of gas in column type circuit breaker as sample to be tested；Sample to be tested is injected into gas-chromatography-four
In grade bar flight time tandem mass spectrum combined instrument, CF in sample to be tested is obtained4Peak area in chromatography of ions figure；
2) according to chromatography external standard method, step 1) is obtained into peak area and CF4The standard curve of standard items compares, and acquisition is surveyed
CF in 1100kV wave filter column type circuit breakers4Detectable concentration.
5. the 1100kV wave filters according to claim 4 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, step 2) includes：The peak area is substituted into the CF4In the calibration curve equation of standard items, institute is calculated
State CF in sample to be tested4Content.
6. the 1100kV wave filters according to claim 4 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, CF4Calibration curve equation is according to CF4Standard items are established；CF4Calibration curve equation is：
Y=10910x+0.0055 formulas 1
In formula 1, y represents the difference of the peak area of standard sample and blank sample, and x represents CF4Content, unit is μ L/L.
7. the 1100kV wave filters according to claim 4 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, in the gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, mass spectrographic operating condition is that ion source is
Electron impact ion source, electron energy 70eV, ion source temperature are 230 DEG C, and transmission line temperature is 250 DEG C, mass scanning model
Enclose for：32-500amu, quantitative model are selected ion monitoring pattern.
8. the 1100kV wave filters according to claim 4 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, in the gas-chromatography-level four bars flight time tandem mass spectrum combined instrument, the operating condition of gas-chromatography is uses
For helium as carrier gas, the helium flow velocity is 1.5mL/min；The temperature-rise period of the gas-chromatography is：5min is kept the temperature at 50 DEG C,
10min is kept the temperature at 200 DEG C, and heating rate is 10 DEG C/min；Split ratio is 20:1；Gas chromatographic column for GASPro0.32mm ×
60m。
9. the 1100kV wave filters according to claim 4 determining method of column type circuit breaker arc-chutes connecting-disconnecting function,
It is characterized in that, the sample size of the sample to be tested is 250 μ L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711297798.0A CN108181576A (en) | 2017-12-08 | 2017-12-08 | The determining method of 1100kV wave filters column type circuit breaker connecting-disconnecting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711297798.0A CN108181576A (en) | 2017-12-08 | 2017-12-08 | The determining method of 1100kV wave filters column type circuit breaker connecting-disconnecting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108181576A true CN108181576A (en) | 2018-06-19 |
Family
ID=62545767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711297798.0A Pending CN108181576A (en) | 2017-12-08 | 2017-12-08 | The determining method of 1100kV wave filters column type circuit breaker connecting-disconnecting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108181576A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633423A (en) * | 2018-11-14 | 2019-04-16 | 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 | A kind of nozzle of circuit breaker ablation status assessing system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921048A (en) * | 2005-08-26 | 2007-02-28 | 吉林省电力科技有限公司 | Method for improving opening capability of SF circuit breaker in low-temperature behavior |
| CN101059485A (en) * | 2007-05-23 | 2007-10-24 | 重庆大学 | Sulfur hexafluoride discharge decomposed gas component analysis system and its usage method |
| CN101799458A (en) * | 2010-03-25 | 2010-08-11 | 广东电网公司电力科学研究院 | Method for analyzing decomposition products of SF6 in electrical device |
| CN102841313A (en) * | 2012-09-03 | 2012-12-26 | 南方电网科学研究院有限责任公司 | Method for estimating comprehensive index of breaker state |
| CN103105441A (en) * | 2013-01-16 | 2013-05-15 | 海南电力技术研究院 | Qualitative and quantitative analysis method for sulfur hexafluoride (SF6) gas discharge decomposition product |
| WO2013087684A1 (en) * | 2011-12-13 | 2013-06-20 | Abb Technology Ag | Method and device for determining an operating parameter of a fluid insulated electrical apparatus |
| CN105388406A (en) * | 2015-12-29 | 2016-03-09 | 武汉大学 | Gas insulated electric equipment partial discharge multi-source joint detection method |
| CN106407501A (en) * | 2016-08-18 | 2017-02-15 | 广州供电局有限公司 | High-pressure gas breaker breaking performance assessment method and system |
| CN108152393A (en) * | 2017-12-08 | 2018-06-12 | 国网陕西省电力公司电力科学研究院 | The detection method of carbon tetrafluoride in 1100kV wave filter column type circuit breakers |
| CN109633423A (en) * | 2018-11-14 | 2019-04-16 | 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 | A kind of nozzle of circuit breaker ablation status assessing system |
-
2017
- 2017-12-08 CN CN201711297798.0A patent/CN108181576A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921048A (en) * | 2005-08-26 | 2007-02-28 | 吉林省电力科技有限公司 | Method for improving opening capability of SF circuit breaker in low-temperature behavior |
| CN101059485A (en) * | 2007-05-23 | 2007-10-24 | 重庆大学 | Sulfur hexafluoride discharge decomposed gas component analysis system and its usage method |
| CN101799458A (en) * | 2010-03-25 | 2010-08-11 | 广东电网公司电力科学研究院 | Method for analyzing decomposition products of SF6 in electrical device |
| WO2013087684A1 (en) * | 2011-12-13 | 2013-06-20 | Abb Technology Ag | Method and device for determining an operating parameter of a fluid insulated electrical apparatus |
| CN102841313A (en) * | 2012-09-03 | 2012-12-26 | 南方电网科学研究院有限责任公司 | Method for estimating comprehensive index of breaker state |
| CN103105441A (en) * | 2013-01-16 | 2013-05-15 | 海南电力技术研究院 | Qualitative and quantitative analysis method for sulfur hexafluoride (SF6) gas discharge decomposition product |
| CN105388406A (en) * | 2015-12-29 | 2016-03-09 | 武汉大学 | Gas insulated electric equipment partial discharge multi-source joint detection method |
| CN106407501A (en) * | 2016-08-18 | 2017-02-15 | 广州供电局有限公司 | High-pressure gas breaker breaking performance assessment method and system |
| CN108152393A (en) * | 2017-12-08 | 2018-06-12 | 国网陕西省电力公司电力科学研究院 | The detection method of carbon tetrafluoride in 1100kV wave filter column type circuit breakers |
| CN109633423A (en) * | 2018-11-14 | 2019-04-16 | 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 | A kind of nozzle of circuit breaker ablation status assessing system |
Non-Patent Citations (2)
| Title |
|---|
| 印华等: "CF4 检测在气体灭弧室绝缘故障诊断中的应用", 《高压电器》 * |
| 齐卫东等: "基于SF6分解产物的1100kV滤波器用柱式断路器工况评估方法", 《高压电器》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633423A (en) * | 2018-11-14 | 2019-04-16 | 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 | A kind of nozzle of circuit breaker ablation status assessing system |
| CN109633423B (en) * | 2018-11-14 | 2020-09-08 | 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 | Circuit breaker spout ablation state evaluation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Fu et al. | Calculated rate constants of the chemical reactions involving the main byproducts SO2F, SOF2, SO2F2 of SF6 decomposition in power equipment | |
| Tang et al. | Partial discharge recognition through an analysis of SF 6 decomposition products part 1: decomposition characteristics of SF 6 under four different partial discharges | |
| US10325764B2 (en) | Automated beam check | |
| US6797943B2 (en) | Method and apparatus for ion mobility spectrometry | |
| CN108152393A (en) | The detection method of carbon tetrafluoride in 1100kV wave filter column type circuit breakers | |
| Morin et al. | Shape resonance and electronic autoionization in vibrationally resolved partial photoionization cross sections of O2 | |
| US10079136B2 (en) | Self-calibration of spectra using differences in molecular weight from known charge states | |
| CN102353737A (en) | Detection device for detecting sulfur hexafluoride electrical equipment fault gas | |
| Zhong et al. | Decomposition characteristics of SF 6 under three typical defects and the diagnostic application of triangle method | |
| CN104090054A (en) | On-line detection method for SF6 gas in electrical equipment | |
| Mullin et al. | Autodetachment dynamics of acetaldehyde enolate anion, CH2CHO | |
| CN107255777A (en) | A kind of SF for being used to characterize air insulating device shelf depreciation energy6Decomposition components characteristic quantity | |
| CN107884691A (en) | A kind of SF6Gas-insulated switchgear built-in electrical insulation trouble-shooter and method | |
| CN102072934A (en) | Method for detecting quality of sulfur hexafluoride gas in power system | |
| CN108181576A (en) | The determining method of 1100kV wave filters column type circuit breaker connecting-disconnecting function | |
| CN112198238B (en) | Method and system for detecting gas decomposition products in circuit breaker under discharge working condition | |
| Yuan et al. | Detection of decomposition products of SF6/air gas mixture by electron attachment mass spectrometry | |
| Hou et al. | Development of a suitcase time‐of‐flight mass spectrometer for in situ fault diagnosis of SF6‐insulated switchgear by detection of decomposition products | |
| Younkin et al. | Description of the prototype diagnostic residual gas analyzer for ITER | |
| CN115791002A (en) | Detection method applied to leakage of environment-friendly insulating gas electrical equipment | |
| GB2615400A (en) | Characterisation of high mass particles | |
| Wang et al. | Decomposition products and mechanism of C 5 F 10 O/N 2 gas mixture by electron attachment mass spectrometry | |
| Zhu et al. | A microwave plasma torch quadrupole mass spectrometer for monitoring trace levels of lead and cadmium in water | |
| CN112782263A (en) | Method for correcting mass spectrum signal of sulfur hexafluoride gas component | |
| CN112147473A (en) | Screening method of high-insulation-strength gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180619 |