CN101915821B - Check method and system of SF6 gas catabolite detecting instrument - Google Patents

Abstract

The invention discloses a check method and a system of an SF6 gas catabolite detecting instrument, wherein the method comprises the following steps of measuring concentration of gas standard substances using SF6 as a diluent gas by using the SF6 gas catabolite detecting instrument; computing multiple performance indexes of the detecting instrument according to the measured concentration; comparing the computed multiple performance indexes of the detecting instrument with the performance indexes of instruments, required by detecting procedures; if all the computed multiple performance indexes of the detecting instrument are in accordance with the performance indexes of instruments, required by detecting procedures, determining that the detecting instrument can be used for on-site detection; otherwise, determining that the detecting instrument cannot be used for on-site detection. The invention can effectively check each performance index of the SF6 gas catabolite detecting instrument, can really reflect actual operation condition of SF6 opening and closing equipment, and provides basis and guidance for evaluation and overhaul of equipment states.

Description

SF 6the method of calibration of gas decomposition product detecting instrument and system

Technical field

The present invention relates to SF in switchgear ₆the detection of gas decomposition product, more specifically, relates to a kind of SF ₆the method of calibration of gas decomposition product detecting instrument and system.

Background technology

Sulfur hexafluoride (SF ₆) gas has excellent insulation and arc extinction performance, is widely used in gas insulated combined electrical equipment (Gas Insulation Switchgear, GIS) and SF ₆in the switchgears such as gas insulation breaker.China's power transmission network (electric pressure>=110kV) mainly adopts SF ₆gas-insulated switchgear, along with the construction of State Grid Corporation of China's extra-high voltage grid, the switchgear of UHVAC demonstration project all adopts SF ₆gas-insulated metal-enclosed GIS or a kind of high-voltage switch equipment (Hybrid GIS, HGIS) between GIS and AIS, and the demand of equipment is just in cumulative year after year.SF ₆switchgear is in vital position in power transmission network, and the safe operation of running status to electrical network of visible equipment plays decisive role.

At present, SF ₆the main monitoring measure of switchgear has: the monitoring of the current characteristics of divide-shut brake coil, breaker mechanism acting characteristic supervision and analysis and SF ₆gas density monitoring etc., these technology can analyze the external status of switchgear effectively, but the diagnosis of switching devices internal state, still lack effective means and deep research.

Large quantity research shows, detects the SF of equipment in running ₆gas decomposition product is the important method of diagnosis and assessment switchgear internal state.For the diagnosis of insulator arrangement inside and the Hidden fault such as abnormal ablation along parts in the abnormal heating, arc-chutes of the connection defect between planar defect, device interior conductor, device interior, and after the inner accident of GIS fault location etc. in, detect SF ₆gas decomposition product method has the advantages such as antijamming capability is strong, highly sensitive, accuracy is good, is necessary SF in regular switching devices thus ₆gas decomposition product carries out determination and analysis, the running status of monitoring switch device interior, for the state estimation of equipment and repair based on condition of component provide guiding suggestion.

SF is carried out to operating switchgear ₆the detection of gas decomposition product, existing method mainly contains vapor-phase chromatography, chromatograph-mass spectrometer coupling method, ion chromatography method, infrared absorption spectroscopy, detection tube method, chemical analysis, sensor, method etc., and the Cleaning Principle of different detection method, technical conditions and the scope of application are different.At SF ₆under the guidance of gas decomposition product detection method, domestic and international scientific research institution and instrument manufacturer facility business have developed various detecting instrument, as portable gas chromatograph, SF ₆decomposed product detector, SF ₆electrical equipment malfunction detector, gas detecting tube device etc.Because these detecting instruments are respectively for different gas decomposition products, the measuring accuracy, range, service condition etc. of instrument are different, make testing result there is larger difference.Owing to lacking unified detection platform, be difficult to existing SF ₆gas decomposition product detecting instrument is compared and is calibrated, and has a strong impact on SF ₆the Site Detection of gas decomposition product, hinders the repair based on condition of component process of switchgear.

Summary of the invention

The technical matters that the present invention will solve is to provide a kind of SF ₆the method of calibration of gas decomposition product detecting instrument, can to existing SF ₆gas decomposition product detecting instrument is compared and is calibrated, with effectively for Site Detection.

The invention provides a kind of SF ₆the method of calibration of gas decomposition product detecting instrument, comprises SF ₆gas decomposition product detecting instrument is measured with SF ₆for the concentration of the gas reference material of diluents; The multinomial performance index of detecting instrument is calculated according to the concentration measured; The multinomial performance index of the detecting instrument calculated and the instrument performance index detecting regulatory requirements are compared; If the multinomial performance index of the detecting instrument calculated all meets the instrument performance index detecting regulatory requirements, then determine that detecting instrument can be used in Site Detection, otherwise, determine that detecting instrument can not be used for Site Detection.

According to an embodiment of the inventive method, the method also comprises: utilize gravimetric method to prepare with SF ₆for the multiple gases standard substance of the variable concentrations of diluents.

According to another embodiment of the inventive method, the multinomial performance index of detecting instrument comprises the accuracy of measurement, the cross jamming degree of gas with various component, the repeatability of measurement and the linearity of instrument.

According to the another embodiment of the inventive method, the step calculating the multinomial performance index of detecting instrument according to the concentration measured comprises: after the gas reference material of the determination component by variable concentrations passes into detecting instrument, calculates the error of indication of detecting instrument according to each concentration indicating value read and the concentration known of the gas reference material determining component; After the gas reference material of the determination component by variable concentrations passes into detecting instrument, according to each detecting instrument read, the cross jamming degree of the gas reference material of component to other gas compositions is determined to the concentration indicating value of other gas compositions and the concentration known calculating of the gas reference material determining component, wherein, other gas compositions are gas compositions that the detecting instrument except determining component can detect; After the gas reference material of the determination component by the determination concentration in detecting instrument range ability repeatedly passes into detecting instrument, according to each concentration indicating value of detecting instrument of reading and the repeatability of the arithmetic average computation and measurement of multiple concentration indicating value; After the gas reference material of the determination component by variable concentrations passes into detecting instrument, according to the concentration indicating value of each detecting instrument read and the linearity of concentration known computing equipment of gas reference material determining component.

The method of calibration of detecting instrument of the present invention, can verify SF effectively ₆the property indices of gas decomposition product detecting instrument, can reflect SF truly ₆the actual operating state of switchgear, for the assessment of equipment state and the maintenance of state provide foundation and guidance.

Another technical matters that the present invention will solve is to provide a kind of SF ₆the check system of gas decomposition product detecting instrument, can to existing SF ₆gas decomposition product detecting instrument is compared and is calibrated, with effectively for Site Detection.

The invention provides a kind of SF ₆the check system of gas decomposition product detecting instrument, comprises detecting instrument, for measuring with SF ₆for the concentration of the gas reference material of carrier gas; Performance Index Calculation device, is connected with detecting instrument, and the concentration for measuring according to detecting instrument calculates the multinomial performance index of detecting instrument; Comparison means, is connected with performance Index Calculation device, for the multinomial performance index of the detecting instrument calculated and the instrument performance index detecting regulatory requirements being compared; Performance determining device, be connected with comparison means, for determining that detecting instrument can be used in Site Detection when the multinomial performance index of the detecting instrument calculated all meets the instrument performance index detecting regulatory requirements, and determine that detecting instrument can not be used for Site Detection when the multinomial performance index of the detecting instrument calculated does not meet the instrument performance index detecting regulatory requirements.

An embodiment of system according to the invention, this system also comprises preparation facilities, is connected with detecting instrument, prepares for utilizing gravimetric method with SF ₆for the multiple gases standard substance of the variable concentrations of diluents.

Another embodiment of system according to the invention, the multinomial performance index of detecting instrument comprises the accuracy of measurement, the cross jamming degree of gas with various component, the repeatability of measurement and the linearity of instrument.

The another embodiment of system according to the invention, performance Index Calculation device comprises: error of indication determination module, after the gas reference material of the determination component by variable concentrations passes into detecting instrument, for calculating the error of indication of detecting instrument according to the concentration known of each concentration indicating value read and the gas reference material determining component; Cross jamming determination module, after the gas reference material of the determination component by variable concentrations passes into detecting instrument, for determining the cross jamming degree of the gas reference material of component to other gas compositions according to each detecting instrument read to the concentration indicating value of other gas compositions and the concentration known calculating of the gas reference material determining component, wherein, other gas compositions are gas compositions that the detecting instrument except determining component can detect; Repeatability determination module, after the gas reference material of the determination component by the determination concentration in detecting instrument range ability repeatedly passes into detecting instrument, for the repeatability according to the concentration indicating value of detecting instrument read and the arithmetic average computation and measurement of multiple concentration indicating value at every turn; Linearity determination module, after the gas reference material of the determination component by variable concentrations passes into detecting instrument, for according to the concentration indicating value of each detecting instrument read and the linearity of concentration known computing equipment of gas reference material determining component.

The check system of detecting instrument of the present invention, can verify SF effectively ₆the property indices of gas decomposition product detecting instrument, can reflect SF truly ₆the actual operating state of switchgear, for the assessment of equipment state and the maintenance of state provide foundation and guidance.

Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part.In the accompanying drawings:

Fig. 1 is the schematic flow sheet of an embodiment of method of calibration of the present invention.

Fig. 2 a is the SO that detecting instrument detects ₂the linearity curve of gas composition.

Fig. 2 b is the H that detecting instrument detects ₂the linearity curve of S gas composition.

Fig. 3 is the structural representation of an embodiment of check system of the present invention.

Fig. 4 is the structural representation of another embodiment of check system of the present invention.

Fig. 5 is the structural representation of the another embodiment of check system of the present invention.

Embodiment

With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Exemplary embodiment of the present invention and explanation thereof for explaining the present invention, but do not form inappropriate limitation of the present invention.

In the prior art, owing to lacking unified detection platform, be difficult to existing SF ₆gas decomposition product detecting instrument is compared and is calibrated, and has had a strong impact on SF ₆the Site Detection of gas decomposition product, hinders the repair based on condition of component process of switchgear.For this reason, in the urgent need to SF ₆the method of calibration of gas decomposition product detecting instrument is studied, and to guarantee reliability and the validity of testing result, thus instructs and carries out the SF of switchgear ₆the testing of gas decomposition product.

The object of this invention is to provide a kind of SF ₆the method of calibration of gas decomposition product detecting instrument and system, to SF ₆gas decomposition product detecting instrument carries out calibrating and comparison, specification switch equipment SF ₆gas decomposition product Site Detection instrument, unified detection platform is to guarantee SF ₆the accuracy of the indicating value that decomposition product detects.

Fig. 1 is the schematic flow sheet of an embodiment of method of calibration of the present invention.

As shown in Figure 1, this embodiment comprises the following steps:

S102, SF ₆gas decomposition product detecting instrument is measured with SF ₆for the concentration of the gas reference material of diluents, such as, this gas reference material can be SO ₂/ SF ₆or H ₂s/SF ₆;

S104, calculates the multinomial performance index of detecting instrument according to the concentration measured, such as, multinomial performance index can comprise the accuracy of measurement, the cross jamming degree of gas with various component, the repeatability of measurement and the linearity of instrument, wherein, selects with SF ₆for the standard substance verification of diluents is used for SF in detector switch equipment ₆the instrument of gas decomposition product, and adopts to come compared with the method for tester, more to meet the insulation status of switchgear inside, truly reflect the actual state of equipment running status with nitrogen or the helium standard substance that is diluents;

S106, compares the multinomial performance index of the detecting instrument calculated and the instrument performance index detecting regulatory requirements;

S108, if the multinomial performance index calculated all meets the instrument performance index detecting regulatory requirements, then determine that detecting instrument can be used in Site Detection, otherwise, determine that detecting instrument can not be used for Site Detection, namely, if all properties index is all qualified, then judge that detecting instrument can be used in Site Detection, if there is a certain individual event or multinomial performance index is defective, then judge that detecting instrument can not onsite application.

This embodiment can verify SF effectively ₆the property indices of gas decomposition product detecting instrument, can reflect SF truly ₆the actual operating state of switchgear, for the assessment of equipment state and the maintenance of state provide foundation and guidance.

In another embodiment of the inventive method, before the multinomial performance index of measuring and testing instrument, gravimetric method can also be utilized to prepare with SF ₆for the multiple gases standard substance of the variable concentrations of diluents.Such as, can according to SF ₆gas composition (such as, the SO that gas decomposition product detecting instrument can be measured ₂gas composition and H ₂s gas composition) and measurement range, select with SF ₆for the standard substance of diluents, the concentration of standard substance be not more than instrument survey the range of gas composition, adopt gravimetric method to prepare the gas reference material of variable concentrations.

In the another embodiment of the inventive method, the step calculating the multinomial performance index of detecting instrument according to the concentration measured comprises:

(1) after the gas reference material of the determination component by variable concentrations passes into detecting instrument, the error of indication of detecting instrument is calculated according to each concentration indicating value read and the concentration known of the gas reference material determining component.

Particularly, in the measurement range of detecting instrument, according to order from low to high by variable concentrations, determine that the gas reference material of composition passes into detecting instrument, after instrument indicating value to be detected is stable, the indicating value C of register instrument _i.For same concentration, can repeated test 3 times, the error of indication of computing equipment.

Wherein, the indicating value of instrument and the absolute error E of gas reference material concentration _icalculation expression be:

E _i＝|C _j-C _s| (1)

In formula (1), C _jfor instrument indicating value C _iarithmetic mean, C _sfor the concentration known of calibrating gas.

Wherein, the relative error E of instrument indicating value and gas reference material concentration _ricalculation expression be:

$E_{\mathrm{ri}}=\frac{|C_j-C_s|}{R}\×100\%---\left(2\right)$

In formula (2), R is the range of this gas composition of apparatus measures.

For often kind of gas composition, choose maximum E _ior E _rias the error of indication of instrument.

The measuring process of the error of indication is described below by way of an instantiation:

Utilize this embodiment to the SF of certain manufacturers produce ₆gas decomposition product detecting instrument is tested, and this instrument runs breaker in middle equipment SF for detecting ₆the SO of gas decomposition product ₂and H ₂s gas composition, instrument detects SO ₂measurement range R be 0 ~ 100 μ L/L, detect H ₂the measurement range R of S is 0 ~ 200 μ L/L.The concentration provided by China National Measuring Science Research Inst. can be selected to be the SO of 90 μ L/L ₂/ SF ₆and H ₂s/SF ₆gas reference material, obtains by the method for dilution corresponding standard substance (that is, the SO that concentration is 2,5,15,30,50 μ L/L respectively ₂/ SF ₆gas reference material and H ₂s/SF ₆gas reference material).

By the SO of variable concentrations ₂/ SF ₆and H ₂s/SF ₆gas reference material passes into detected instrument according to order from low to high, register instrument indicating value, repeated test 3 times, the mean value C of computing equipment indicating value _jand relative error E _ri, the check results of this tester measuring accuracy as described in Table 1.Test result shows, is detected SO by test examination instrument ₂the error of indication of gas composition is 3.34%, detects H ₂the error of indication of S gas composition is 2.66%.

The check results of table 1 tester measuring accuracy

(2) after the gas reference material of the determination component by variable concentrations passes into detecting instrument, according to each detecting instrument read, the cross jamming degree of the gas reference material of component to other gas compositions is determined to the concentration indicating value of other gas compositions and the concentration known calculating of the gas reference material determining component, wherein, other gas compositions are gas compositions that the detecting instrument except determining component can detect.

Particularly, detecting instrument can by passing into instrument by the gas reference material of a certain one-component to the cross jamming degree of gas with various component, register instrument to other gas compositions (such as, if instrument may be used for detecting gas decomposition product SO ₂and H ₂s, and pass into instrument for SO ₂/ SF ₆gas reference material, then other gas compositions refer to H ₂s gas composition) indicating value C _d, calculate tested gas composition (such as, SO ₂) to other gas compositions (such as, H ₂s) annoyance level E _dexpression formula be:

$E_d=\frac{C_d}{C_s}\×100\%---\left(3\right)$

The measuring process of cross jamming degree is described below by way of an instantiation:

By the SO of variable concentrations ₂/ SF ₆and H ₂s/SF ₆gas reference material passes into respectively by test examination instrument, and register instrument detects H respectively ₂s and SO ₂the indicating value C of gas composition _d, computing equipment is at H ₂s and SO ₂annoyance level E between gas composition _d.Testing result as described in Table 2, is detected SO by test examination instrument ₂gas composition is to H ₂the annoyance level that S gas composition detects is 2%, detects H ₂s gas composition is to SO ₂gas composition detects not interference.

The cross jamming check results of table 2 instrument between gas composition

Due to SF ₆there is cross jamming phenomenon in gas decomposition product detecting instrument, instrument may be subject to the impact of other gas componants to the indicating value of surveyed gas componant between gas with various composition, so by the annoyance level of tester, can effectively eliminate Site Detection SF ₆interference between each gas componant of gas decomposition product.

(3) after the gas reference material of the determination component by the determination concentration in detecting instrument range ability repeatedly passes into detecting instrument, according to each concentration indicating value of detecting instrument of reading and the repeatability of the arithmetic average computation and measurement of multiple concentration indicating value.

Particularly, select concentration to be applicable to the gas reference material of instrument range, in short period interval, testing instruments carry out the consistent degree of the result measured continuously.By instrument the gas reference material of certain concentration surveyed in the measurement range of gas composition pass into instrument, register instrument indicating value.In 3 minutes, repeatedly duplicate measurements, respectively register instrument indicating value C _i.With relative standard deviation C _rrepresent the repeatability of instrument, pendulous frequency is not less than 6, and calculation expression is:

$C_r=\frac{\sqrt{\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{(C_i-C_j)}^2}{n-1}}}{C_j}\×100\%---\left(4\right)$

In formula (4), n is pendulous frequency.

The process detecting the repeatability measured is described with an instantiation below:

Be the SO of 15 μ L/L by concentration ₂/ SF ₆gas reference material and concentration are the H of 5 μ L/L ₂s/SF ₆gas reference material passes into by test examination instrument, within the shorter time interval, and duplicate measurements 6 times, the instrument indicating value C of each test of record _i, calculate the repeated C of instrument _r.As described in Table 3, SO is detected by school instrument ₂the repeated relative standard deviation of gas composition is 1.22%, detects H ₂the repeated relative standard deviation of S gas composition is 1.79%.

The check results of table 3 Instrument measuring repeatability

Carry out the result of parallel experiment and computational analysis from the above-mentioned repeatability to apparatus measures, the repeatability of measurement has investigated the stability of instrument, avoids in the change of measuring process Instrumental indicating value excessive, ensure that the accuracy of testing result.

(4) after the gas reference material of the determination component by variable concentrations passes into detecting instrument, according to the concentration indicating value of each detecting instrument read and the linearity of concentration known computing equipment of gas reference material determining component.

Particularly, the linearity refers to the degree of correlation of the linear relationship of the output of detecting instrument in the measurement range of surveyed gas composition and input.Choose instrument survey the gas reference material of gas composition, according to order from low to high by variable concentrations C _sgas reference material pass into instrument, after instrument indicating value is stable, register instrument indicating value C _i.To often kind of gas composition that instrument is surveyed, choose 5 concentration point and carry out linearity test, the linearly dependent coefficient r of computing equipment, its expression formula is:

$r=\frac{\mathrm{\Σ}{C}_i{C}_s-\frac{\mathrm{\Σ}{C}_i\mathrm{\Σ}{C}_s}{n}}{\sqrt{\mathrm{\Σ}{C_i}^2-\frac{{\left(\mathrm{\Σ}{C}_i\right)}^2}{n}}\sqrt{\mathrm{\Σ}{C_s}^2-\frac{{\left(\mathrm{\Σ}{C}_s\right)}^2}{n}}}---\left(5\right)$

The measuring process of the linearity of instrument is described below by way of an instantiation:

Be the SO of 2,5,15,30,50,90 μ L/L by concentration ₂/ SF ₆and H ₂s/SF ₆gas reference material inputs successively by test examination instrument, register instrument indicating value, the linearly dependent coefficient that computing equipment is measured.By the test result of test examination instrument as described in Table 4, the SO detected ₂the linearity of gas composition as shown in Figure 2 a, the H detected ₂the linearity of S gas composition as shown in Figure 2 b.

The test result of the table 4 instrument linearity

The instrument linearity test result provided from Fig. 2 a and Fig. 2 b, is detected SO by school instrument ₂, H ₂the linearly dependent coefficient of S gas composition is respectively 0.9997 and 0.9994, visible, and instrument all has good linear relationship in the measurement range of surveyed gas composition.

The linearity of instrument gives the linear relationship of instrument in the measurement range of surveyed gas composition on the whole, is conducive to SF ₆the Site Detection of gas decomposition product, ensure that reliability and the validity of testing result.

To the SF running breaker in middle equipment ₆when gas decomposition product carries out Site Detection, SF ₆the technical manual (that is, detecting the instrument performance index of regulatory requirements) of gas decomposition product detecting instrument requires:

(1) at instrument survey in the measurement range of gas composition, the error of indication of instrument is not more than 5%;

(2) instrument is not more than 5% to the annoyance level between gas with various component;

(3) the repeated relative standard deviation of instrument is not more than 2%;

(4) linearity of instrument is not less than 0.99.

Add up by above-mentioned every test performance index of school instrument, with SF ₆the Site Detection specification of gas decomposition product detecting instrument compares, as described in Table 5.

Table 5 instrument test result and Site Detection Standard heading

Visible, met switchgear SF by test examination instrument ₆the Site Detection code requirement of gas decomposition product is specification product, can be used for running breaker in middle equipment SF ₆the Site Detection of gas decomposition product.

This embodiment has added up the property indices of detecting instrument, and whether the performance index having passed judgment on tested instrument reach SF ₆the Site Detection requirement of gas decomposition product, and then unified SF ₆the platform that gas decomposition product detects, for the state estimation of switchgear and repair based on condition of component provide important foundation.

Fig. 3 is the structural representation of an embodiment of check system of the present invention.

As shown in Figure 3, the check system in this embodiment comprises:

Detecting instrument 11, for measuring with SF ₆for the concentration of the gas reference material of diluents;

Performance Index Calculation device 12, be connected with detecting instrument 11, concentration for measuring according to detecting instrument calculates the multinomial performance index of detecting instrument, such as, the multinomial performance index of detecting instrument can comprise the accuracy of measurement, the cross jamming degree of gas with various component, the repeatability of measurement and the linearity of instrument, wherein, select with SF ₆for the standard substance verification of carrier gas is used for SF in detector switch equipment ₆the instrument of gas decomposition product, and adopts to come compared with the method for tester, more to meet the insulation status of switchgear inside, truly reflect the actual state of equipment running status with nitrogen or the helium standard substance that is diluents;

Comparison means 13, is connected with performance Index Calculation device 12, for the multinomial performance index of the detecting instrument calculated and the instrument performance index detecting regulatory requirements being compared;

Performance determining device 14, be connected with comparison means 13, for determining that detecting instrument can be used in Site Detection when the multinomial performance index of the detecting instrument calculated all meets the instrument performance index detecting regulatory requirements, and determine that detecting instrument can not be used for Site Detection when the multinomial performance index of the detecting instrument calculated does not meet the instrument performance index detecting regulatory requirements, namely, if all properties index is all qualified, then judge that detecting instrument can be used in Site Detection, if there is a certain individual event or multinomial performance index is defective, then judge that detecting instrument can not onsite application.

This embodiment can verify SF effectively ₆the property indices of gas decomposition product detecting instrument, can reflect SF truly ₆the actual operating state of switchgear, for the assessment of equipment state and the maintenance of state provide foundation and guidance.

Fig. 4 is the structural representation of another embodiment of check system of the present invention.

As shown in Figure 4, compared with the embodiment in Fig. 3, the check system of this embodiment also comprises preparation facilities 21, is connected with detecting instrument 11, prepares for utilizing gravimetric method with SF ₆for the multiple gases standard substance of the variable concentrations of diluents, such as, can according to SF ₆gas composition (such as, the SO that gas decomposition product detecting instrument can be measured ₂gas and H ₂s gas) and measurement range, select with SF ₆for the standard substance of carrier gas, the concentration of standard substance be not more than instrument survey the range of gas composition, adopt gravimetric method to prepare the gas reference material of variable concentrations.

Fig. 5 is the structural representation of the another embodiment of check system of the present invention.

As shown in Figure 5, compared with the embodiment in Fig. 3, the performance Index Calculation device 31 in this embodiment comprises:

Error of indication determination module 311, after the gas reference material of the determination component by variable concentrations passes into detecting instrument, for calculating the error of indication of detecting instrument according to the concentration known of each concentration indicating value read and the gas reference material determining component; Particularly, in the measurement range of detecting instrument, according to order from low to high by variable concentrations, determine that the gas reference material of composition passes into detecting instrument, after instrument indicating value to be detected is stable, the indicating value C of register instrument _i, for same concentration, can repeated test 3 times with the error of indication of computing equipment, wherein, the indicating value of instrument and the absolute error E of gas reference material concentration _icalculation expression be formula (1), the relative error E of instrument indicating value and gas reference material concentration _ricalculation expression be formula (2), for often kind of gas composition, choose maximum E _ior E _rias the error of indication of instrument, concrete measurement result can see above-mentioned table 1;

Cross jamming determination module 312, after the gas reference material of the determination component by variable concentrations passes into detecting instrument, for determining the cross jamming degree of the gas reference material of component to other gas compositions according to each detecting instrument read to the concentration indicating value of other gas compositions and the concentration known calculating of the gas reference material determining component, wherein, other gas compositions are gas compositions that the detecting instrument except determining component can detect; Particularly, detecting instrument can by passing into instrument by the gas reference material of a certain one-component to the cross jamming degree of gas with various component, register instrument to other gas compositions (such as, if instrument can be used in detecting gas decomposition product SO ₂and H ₂s, and pass into instrument for SO ₂/ SF ₆gas reference material, then other gas compositions refer to H ₂s gas composition) indicating value C _d, calculate tested gas composition (such as, SO ₂) to other gas compositions (such as, H ₂s) annoyance level E _dexpression formula be formula (3), this module, by the annoyance level of tester, can eliminate Site Detection SF effectively ₆interference between each gas componant of gas decomposition product;

Repeatability determination module 313, after the gas reference material of the determination component by the determination concentration in detecting instrument range ability repeatedly passes into detecting instrument, for the repeatability according to the concentration indicating value of detecting instrument read and the arithmetic average computation and measurement of multiple concentration indicating value at every turn; Particularly, can by instrument the gas reference material of certain concentration surveyed in the measurement range of gas composition pass into instrument, register instrument indicating value.In 3 minutes, repeatedly duplicate measurements, respectively register instrument indicating value C _i, with relative standard deviation C _rrepresent the repeatability of instrument, pendulous frequency is not less than 6, and calculation expression is formula (4), and this module is avoided in the change of measuring process Instrumental indicating value excessive, ensure that the accuracy of testing result;

Linearity determination module 314, after the gas reference material of the determination component by variable concentrations passes into detecting instrument, for according to the concentration indicating value of each detecting instrument read and the linearity of concentration known computing equipment of gas reference material determining component; Particularly, the linearity refers to the degree of correlation of the linear relationship of the output of tester in the measurement range of surveyed gas composition and input, can choose instrument survey the gas reference material of gas composition, according to order from low to high by variable concentrations C _sgas reference material pass into instrument, after instrument indicating value is stable, register instrument indicating value C _i, to often kind of gas composition that instrument is surveyed, choose 5 concentration point and carry out linearity test, the linearly dependent coefficient r of computing equipment, its expression formula is formula (5).This module gives the linear relationship of instrument in the measurement range of surveyed gas composition on the whole, is conducive to SF ₆the Site Detection of gas decomposition product, ensure that reliability and the validity of testing result.

This embodiment has added up the property indices of detecting instrument, and whether the performance index having passed judgment on tested instrument reach SF ₆the Site Detection requirement of gas decomposition product, and then unified SF ₆the platform that gas decomposition product detects, for the state estimation of switchgear and repair based on condition of component provide important foundation.

Claims (4)

1. a SF ₆the method of calibration of gas decomposition product detecting instrument, is characterized in that, described method comprises:

SF ₆gas decomposition product detecting instrument is measured with SF ₆for the concentration of the gas reference material of diluents, described gas reference material is the standby SO of weight legal system ₂/ SF ₆and H ₂s/SF ₆;

Calculate the multinomial performance index of described detecting instrument according to the concentration measured, the multinomial performance index of described detecting instrument comprises accuracy, the SO of measurement ₂with H ₂the cross jamming degree of S, the repeatability of measurement and the linearity of instrument;

The multinomial performance index of the described detecting instrument calculated and the instrument performance index of Site Detection code requirement are compared;

If the multinomial performance index of the described detecting instrument calculated all meets the instrument performance index of described Site Detection code requirement, then determine that described detecting instrument can be used in Site Detection, otherwise, determine that described detecting instrument can not be used for Site Detection;

Wherein, the step that the concentration that described basis is measured calculates the multinomial performance index of described detecting instrument comprises:

At the SO by variable concentrations ₂/ SF ₆and H ₂s/SF ₆after gas reference material passes into described detecting instrument respectively, the gas reference material of institute's detected components is calculated to the cross jamming degree of other gas compositions according to the concentration known of each described detecting instrument read to the gas reference material of the concentration indicating value of other gas compositions and institute's detected components, wherein, other gas compositions described are gas compositions that the described detecting instrument except institute's detected components can detect.

2. method according to claim 1, is characterized in that, the step that the concentration that described basis is measured calculates the multinomial performance index of described detecting instrument also comprises:

After the gas reference material of the determination component by variable concentrations passes into described detecting instrument, calculate the error of indication of described detecting instrument according to each concentration indicating value read and the concentration known of the gas reference material determining component;

After the gas reference material of the determination component by the determination concentration in described detecting instrument range ability repeatedly passes into described detecting instrument, calculate the repeatability of described measurement according to the concentration indicating value of described detecting instrument read and the arithmetic average of multiple concentration indicating value at every turn;

After the gas reference material of the determination component by variable concentrations passes into described detecting instrument, according to the concentration indicating value of each described detecting instrument read and describedly determine the linearity that the concentration known of the gas reference material of component calculates described instrument.

3. a SF ₆the check system of gas decomposition product detecting instrument, is characterized in that, described system comprises:

Detecting instrument, for measuring with SF ₆for the concentration of the gas reference material of diluents;

Preparation facilities, is connected with described detecting instrument, prepares for utilizing gravimetric method with SF ₆for the SO of the variable concentrations of diluents ₂/ SF ₆and H ₂s/SF ₆gas reference material;

Performance Index Calculation device, be connected with described detecting instrument, concentration for measuring according to described detecting instrument calculates the multinomial performance index of described detecting instrument, and the multinomial performance index of described detecting instrument comprises the accuracy of measurement, the cross jamming degree of gas with various component, the repeatability of measurement and the linearity of instrument;

Comparison means, is connected with described performance Index Calculation device, for the multinomial performance index of the described detecting instrument calculated and the instrument performance index detecting regulatory requirements being compared;

Performance determining device, be connected with described comparison means, for determining that described detecting instrument can be used in Site Detection when the multinomial performance index of the described detecting instrument calculated all meets the instrument performance index of described detection regulatory requirements, and determine that described detecting instrument can not be used for Site Detection when the multinomial performance index of the described detecting instrument calculated does not meet the instrument performance index of described detection regulatory requirements;

Wherein, described performance Index Calculation device comprises:

Cross jamming determination module, at the SO by variable concentrations ₂/ SF ₆and H ₂s/SF ₆after gas reference material passes into described detecting instrument respectively, for calculating the gas reference material of institute's detected components to the cross jamming degree of other gas compositions according to the concentration known of each described detecting instrument read to the gas reference material of the concentration indicating value of other gas compositions and institute's detected components, wherein, other gas compositions described are gas compositions that the described detecting instrument except institute's detected components can detect.

4. system according to claim 3, is characterized in that, described performance Index Calculation device also comprises:

Error of indication determination module, after the gas reference material of the determination component by variable concentrations passes into described detecting instrument, for calculating the error of indication of described detecting instrument according to the concentration known of each concentration indicating value read and the gas reference material determining component;

Repeatability determination module, after the gas reference material of the determination component by the determination concentration in described detecting instrument range ability repeatedly passes into described detecting instrument, for calculating the repeatability of described measurement according to the concentration indicating value of described detecting instrument read and the arithmetic average of multiple concentration indicating value at every turn;

Linearity determination module, after the gas reference material of the determination component by variable concentrations passes into described detecting instrument, for according to the concentration indicating value of each described detecting instrument read and describedly determine the linearity that the concentration known of the gas reference material of component calculates described instrument.