CN105223286A - The preparation of characteristic of transformer gas standard oil sample and evaluation method - Google Patents
The preparation of characteristic of transformer gas standard oil sample and evaluation method Download PDFInfo
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Abstract
A kind of compound method of characteristic of transformer gas standard oil sample and evaluation method, this compound method is by the calibrating gas of preparation variable concentrations, preparation blank oil sample and the abundant step such as standard mixture and blank oil sample, realize the preparation of characteristic of transformer gas standard oil sample, the standard oil sample of the variable concentrations that this evaluation method utilizes said method to prepare, by comprising minimum detectable concentration, the repeatability of data and accuracy to gas chromatography performance and evaluating gas chromatograph, thus realize the thoroughly evaluating to characteristic of transformer gas standard oil sample.The present invention disposable preparation can be dissolved with the standard oil sample of setting characteristic gas concentration, and can improve gas chromatograph quality, with the accuracy of assurance device operational reliability and data.
Description
Technical field
The invention belongs to insulation of electrical installation monitoring field, particularly a kind of compound method of characteristic of transformer gas standard oil sample and evaluation method.
Background technology
Along with the continuous propelling of strong intelligent grid strategy, transformer is as the core power equipment of intelligent power transformation link, the pivotal role connecting different electric pressure electrical network is played in electric system, stable and the safety of its operational reliability and electric system is closely related, and China's power department has dropped into a large amount of manpowers, fund and the equipment transformer to 220KV above and installed on-Line Monitor Device additional.Run with the appearance of new technology, new equipment and the large scale investment of monitoring device, old detection method can not meet the detection demand of new equipment, the Performance Detection means adapted with new equipment also need foundation badly, improve the dynamics of checking on of transformer monitoring device performance with this.
At present, the power transformer of the above grade of China 110KV still based on oil-filled transformer, when inside transformer generation hot stall or discharging fault or oil, paper all can produce various minimum gas time aging.The relative populations of the various gas componants of dissolving in transformer oil and the fault offset form of formation speed and trouble spot and fault type have obvious corresponding relation, how much whether exception can be there is in judgment device inside further according to various gas componant content, and then infer fault type and fault energy etc., realize repair based on condition of component.By on-line chromatograph monitor device, transformer oil is carried out continuously or Real-Time Monitoring, the operation conditions of equipment can be grasped at any time, whether normal judge that it runs, the nature of trouble that diagnostic device inside exists, type, position and the order of severity also predict the development trend of fault.Along with the development of domestic and international chromatographic technique, develop and can detect H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2in the chromatogram monitoring device of 7 kinds of component concentrations.But due to the impact of chromatograph itself or other factors, measurement result deviation may be caused or the problem such as data are insensitive.Therefore need to grasp this area chromatogram arrangement equipment quality and Problems existing in running, specification on-line equipment is selected, is checked and accepted, and equipment during field surveillance detects and runs guarantees that monitoring equipment plays and should have effect.
Use the calibrating gas of one or more groups concentration to detect the otherness of chromatographic data and calibrating gas to operating chromatograph, thus realize the appraisal of online gc, the chromatograph method therefor that this and metrological service examine and determine in laboratory duplicates.The online gc of different manufacturers, due to the otherness of analysis principle and analytic process, result in the difference of testing result, and its chromatographic component detecting device difference used is little, and data deviation mainly concentrates on the degassed processing mode aspect of oil sample.Therefore, when only verifying work being carried out to online gc by calibrating gas, just verified the detecting device of equipment, and do not taken into account the whole process of the degassed aspect of equipment, thus caused verifying work to lose efficacy.The approach addressed this problem utilizes the standard oil sample being dissolved with characteristic of transformer gas to demarcate chromatogram arrangement, and need to carry out thoroughly evaluating to improve chromatographic detection apparatus quality to characteristic of transformer gas standard oil sample.
Summary of the invention
In view of this, the object of this invention is to provide a kind of preparation and evaluation method of characteristic of transformer gas standard oil sample.
Preparation and the evaluation method of the application's characteristic of transformer gas standard oil sample are achieved through the following technical solutions:
A compound method for characteristic of transformer gas standard oil sample, is characterized in that, described compound method comprises the following steps:
(1) calibrating gas of preparation setting concentration: according to standard oil sample suggestion concentration, import in air chamber by transformer fault characteristic gas successively by gas mass flow controller MFC, described fault characteristic gases is H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2, thus make the normal mixture body of described suggestion concentration;
(2) blank oil sample is prepared: bubbling injects high pure nitrogen and fully stirs in transformer oil, vacuum outgas method is adopted to carry out degassed to oil sample, oil sample is made to be in extremely undersaturated condition, fully circulate in closed container, keep the homogeneity of blank oil sample, described bubbling injection refers to and slowly passes into transformer oil in the form of bubbles bottom Nitrogen from vessel;
(3) abundant standard mixture and blank oil sample: accumulator is vacuumized and passes into quantitative blank oil sample, the calibrating gas prepared slowly is imported in accumulator through mass flow controller, gas contacts with blank oil and dissolves in the form of bubbles in uphill process, fail to be dissolved into gas in oil to be extracted out from accumulator upper strata by vacuum air pump and import to again bottom accumulator, carry out secondary with oil sample to mix, circulate according to this, until gas is fully dissolved in oil sample, thus make the standard oil sample being dissolved with desired gas concentration.
The present invention also preferably includes following scheme:
In step (1), described standard oil sample advises that concentration passes judgment on transformer state for foundation setting to use gas dissolved in oil of power trans-formers in IEEEC57.104-2008 " oil-filled transformer produces the description guide of gas ".
Characteristic gas standard oil sample comprises standard oil sample 1, standard oil sample 2 and standard oil sample 3;
Wherein, the corresponding transformer fault early warning value of standard oil sample 1, if each concentration of component of Gases Dissolved in Transformer Oil is lower than each gas component concentrations in fault pre-alarming value and standard oil sample 1, then illustrates that transformer is in normal operating condition;
The corresponding Repair of Transformer critical value of standard oil sample 2, if gas dissolved in oil of power trans-formers is higher than each gas component concentrations in maintenance critical value and standard oil sample 2, then judges that transformer breaks down, should overhaul immediately;
Standard oil sample 3 corresponding transformer early warning failure value, if Gases Dissolved in Transformer Oil concentration of component is higher than each gas component concentrations in early warning failure value and standard oil sample 3, then judges that transformer oil excessive decomposition occurs, and continues operation and transformer can be caused to lose efficacy.
Wherein, the suggestion concentration of described standard oil sample 1 is as follows: H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2suggestion concentration be respectively 100ppm, 350ppm, 2500ppm, 120ppm, 50ppm, 65ppm, 1ppm;
The suggestion concentration of described standard oil sample 2 is as follows: H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2suggestion concentration be respectively 700ppm, 570ppm, 4000ppm, 400ppm, 100ppm, 100ppm, 10ppm;
The suggestion concentration of described standard oil sample 3 is as follows: H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2suggestion concentration be respectively 1800ppm, 1400ppm, 10000ppm, 1000ppm, 200ppm, 150ppm, 35ppm.
In step (1), in the characteristic of transformer gas standard oil sample prepared, concentration data and the deviation calculating gained theoretical concentration according to GT/B17623-1998 " Gas Chromatographic Determination of Dissolved Gases in Insulating Oil component concentration " of each fault characteristic gases component conforms with the regulations requirement, and namely relative deviation is less than 10%.
In step (2), described high pure nitrogen refers to that its purity is more than or equal to 99.999%, and described blank oil sample extremely undersaturated condition refers to that the vacuum tightness of blank oil sample is 0.0907-0.0933MPa.
Closed container is made up of silicon steel material, and is provided with the rubber gas injection pad for sealing;
Described homogeneity refers to the area requirement meeting and specify in GB/T17623-1998, and namely the concentration of standard oil sample different parts surveys deviation in 10%.
Disclosed herein as well is and a kind ofly to it is characterized in that the above-mentioned evaluation method stating characteristic of transformer gas standard oil sample, described evaluation method comprises the following steps:
(1) propose standard oil sample suggestion concentration according to IEEEC57.104-2008, the characteristic of transformer gas standard oil sample of preparation 3 kinds of variable concentrations, comprises standard oil sample 1, standard oil sample 2, standard oil sample 3;
(2) for the standard oil sample of above-mentioned 3 kinds of variable concentrations, the method all specified according to GB/T7597-2007 under each concentration gathers standard twice oil sample from the hydraulic fluid port of getting of accumulator, according to method described in GB/T17623-1998, with laboratory high-precision chromatography instrumental analysis, get the normal concentration of mean value as each component to be measured of each characteristic gas content in standard twice oil sample;
(3) gas chromatograph to be evaluated is connected with standard oil sample 1,2,3 respectively, to the standard oil sample repeated test 6 times of each concentration, obtain peak height signal and the noise signal of the component each to be measured in each standard oil sample, calculate the minimum detectable concentration of each component of gas chromatograph to be evaluated; According to being tested the characteristic gas component single test concentrations to be measured obtained by gas chromatograph, calculate the standard deviation of the component to be measured in each standard oil sample;
(4) suggestion concentration absolute error and the relative error of being tested characteristic gas component to be measured and this standard oil sample in each standard oil sample obtained by gas chromatograph is calculated, if any gas composition in the characteristic of transformer gas standard oil sample of 3 kinds of variable concentrations and this gas composition in corresponding standard oil sample advise that the relative error of concentration exceedes ± 30%, then need to calibrate gas chromatograph.
The advantage of the application is: this standard transformer oil sample compound method disposablely can obtain the standard transformer oil sample being dissolved with known gas concentration, and can be long time stored.By the thoroughly evaluating to characteristic of transformer gas standard oil sample, can reach and improve electrical net detect device quality, the object of assurance device operational reliability and data accuracy.
Accompanying drawing explanation
Figure 1 shows that the compound method process flow diagram of characteristic of transformer gas standard oil sample disclosed by the invention;
Figure 2 shows that the evaluation method schematic flow sheet of the present invention to characteristic of transformer gas standard oil sample.
Embodiment
Below in conjunction with Figure of description, the compound method of characteristic of transformer gas standard oil sample of the present invention and evaluation method are described in detail successively.
Be the compound method process flow diagram of characteristic of transformer gas standard oil sample disclosed by the invention as shown in Figure 1.
The compound method of characteristic of transformer gas standard oil sample comprises the following steps:
(1) preparation sets the calibrating gas of concentration: pass judgment on transformer state as advising concentration according to proposing standard oil sample with the middle gas dissolved in oil of power trans-formers that uses of IEEEC57.104-2008 " oil-filled transformer produces the description guide of gas ": adopt the corresponding transformer fault early warning value of standard oil sample 1, if each concentration of component of Gases Dissolved in Transformer Oil is generally lower than fault pre-alarming value, then illustrate that transformer is in normal operating condition; Adopt the corresponding Repair of Transformer critical value of standard oil sample 2, if gas dissolved in oil of power trans-formers is generally in fault pre-alarming value and maintenance critical value range, then illustrate that transformer starts to occur abnormality, if continue run and gas component concentrations generally higher than maintenance critical value, then illustrate that transformer oil decomposes in a large number, transformer may break down, should overhaul immediately; Adopt standard oil sample 3 corresponding transformer early warning failure value, if Gases Dissolved in Transformer Oil concentration of component is generally higher than early warning failure value, then illustrates that transformer oil excessive decomposition occurs, continue operation and transformer can be caused to lose efficacy.
According to standard oil sample suggestion concentration, successively 7 kinds of transformer fault characteristic gas are imported in air chamber by gas mass flow controller MFC, thus make the normal mixture body of setting concentration; In the characteristic of transformer gas standard oil sample prepared, concentration data and the deviation calculating gained theoretical concentration according to GT/B17623-1998 " Gas Chromatographic Determination of Dissolved Gases in Insulating Oil component concentration " of each component conforms with the regulations requirement, and namely relative deviation is less than 10%.
Table 1: standard oil sample suggestion concentration (unit: μ L/L)
| Gas composition | Standard oil sample 1 | Standard oil sample 2 | Standard oil sample 3 |
| H 2 | 100 | 700 | 1800 |
| CH 4 | 120 | 400 | 1000 |
| C 2H 2 | 1 | 10 | 35 |
| C 2H 4 | 50 | 100 | 200 |
| C 2H 6 | 65 | 100 | 150 |
| CO | 350 | 570 | 1400 |
| CO 2 | 2500 | 4000 | 10000 |
(2) prepare blank oil sample: by purity be 99.999% Nitrogen from vessel bottom slowly pass into transformer oil in the form of bubbles, and fully stir, vacuum outgas method is adopted to carry out degassed to oil sample, oil sample is made to be in extremely undersaturated condition, vacuum tightness is 0.0907-0.0933MPa, fully circulates in closed container, ensures the homogeneity of oil sample, homogeneity meets the area requirement specified in GB/T17623-1998, and namely the concentration deviation of standard oil sample different parts is in 10%; Closed container is made up of silicon steel material, and is provided with the rubber gas injection pad for sealing.
(3) abundant standard mixture and blank oil sample: accumulator is vacuumized and passes into quantitative blank oil sample, the calibrating gas prepared slowly imports in accumulator through mass flow controller, gas contacts with blank oil and dissolves in the form of bubbles in uphill process, fail to be dissolved into gas in oil to be extracted out from accumulator upper strata by vacuum air pump and import to again bottom accumulator, carry out secondary with oil sample to mix, circulate according to this, until gas is fully dissolved in oil sample, thus make the standard oil sample being dissolved with desired gas concentration.
Cil＝Ki×Cig
Concentration in the liquid of Cil: under equilibrium condition, dissolved gas i component;
Concentration in the gas of Cig: under equilibrium condition, dissolved gas i component;
Ki: under test temperature, the partition factor of dissolved gas i component after gas, liquid balance.
Disclosed herein as well is a kind of evaluation method to above-mentioned characteristic of transformer gas standard oil sample, as shown in Figure 2, described evaluation method, comprises the following steps:
(1) for guaranteeing the validity of gas chromatograph appraisal, must be realized by different standard oil samples.Propose standard oil sample suggestion concentration according to IEEEC57.104-2008, prepare the characteristic of transformer gas standard oil sample of 3 groups of variable concentrations, comprise standard oil sample 1, standard oil sample 2, standard oil sample 3;
(2) for the standard oil sample of above-mentioned 3 kinds of variable concentrations, the method all specified according to GB/T7597-2007 under each concentration gathers two standard oil samples from the hydraulic fluid port of getting of accumulator, according to method described in GB/T17623-1998, with laboratory high-precision chromatography instrumental analysis, get the normal concentration of mean value as each component to be measured of each characteristic gas content in two standard oil samples;
(3) be connected with standard oil sample 1 by gas chromatograph to be evaluated, repeated test 6 times, utilizes the supervisory system of gas chromatograph to be evaluated to obtain peak height signal and the noise signal of each component to be measured.
Calculate the formula of a certain characteristic gas component minimum detectable concentration in the standard oil sample 1 that gas chromatograph to be evaluated detects:
C
min: the minimum detectable concentration (μ L/L) of characteristic gas component to be measured;
C
s: the normal concentration (μ L/L) of characteristic gas component to be measured;
: the average noise (mV) of characteristic gas component to be measured;
: the average peak height (mV) of characteristic gas component to be measured.
Calculate repeatability and the accuracy of standard oil sample 1 characteristic gas component to be measured:
Calculate the formula of standard oil sample 1 characteristic gas Component Standard to be measured deviation:
Calculate the formula of standard oil sample 1 characteristic gas component to be measured relative standard deviation:
SD: the standard deviation (μ L/L) of characteristic gas component to be measured;
RSD: the relative standard deviation (%) of characteristic gas component to be measured;
C
i: characteristic gas component single test concentrations (μ L/L) to be measured;
: characteristic gas component average test concentration (μ L/L) to be measured:
N: replicated experimental units, value is 6 herein.
The relative standard deviation RSD of each gas composition should be not more than 5%, to ensure repeatability.
Calculate the formula of standard oil sample 1 characteristic gas component to be measured absolute error:
Calculate the formula of standard oil sample 1 characteristic gas component to be measured relative error:
E: the absolute error (μ L/L) of characteristic gas component to be measured;
R
e: the relative error (%) of characteristic gas component to be measured.
Complete gas chromatograph to be evaluated to after the detection of standard oil sample 1, be successively connected with standard oil sample 2,3, the same repeated test of each oil sample 6 times, calculates respectively according to above-mentioned steps.
(4) standard of verification gas chromatograph is proposed: compare, the concentration that gas chromatograph to be evaluated detects data and standard oil sample if the relative error R of each gas composition
eexceed ± 30%, then need to calibrate gas chromatograph.
Above-described embodiment limits the present invention never in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops within protection scope of the present invention.
Claims (8)
1. a compound method for characteristic of transformer gas standard oil sample, is characterized in that, described compound method comprises the following steps:
(1) calibrating gas of preparation setting concentration: according to standard oil sample suggestion concentration, import in air chamber by transformer fault characteristic gas successively by gas mass flow controller MFC, described fault characteristic gases is H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2, thus make the normal mixture body of described suggestion concentration;
(2) blank oil sample is prepared: bubbling injects high pure nitrogen and fully stirs in transformer oil, vacuum outgas method is adopted to carry out degassed to oil sample, oil sample is made to be in extremely undersaturated condition, fully circulate in closed container, keep the homogeneity of blank oil sample, described bubbling injection refers to and slowly passes into transformer oil in the form of bubbles bottom Nitrogen from vessel;
(3) abundant standard mixture and blank oil sample: accumulator is vacuumized and passes into quantitative blank oil sample, the calibrating gas prepared slowly is imported in accumulator through mass flow controller, gas contacts with blank oil and dissolves in the form of bubbles in uphill process, fail to be dissolved into gas in oil to be extracted out from accumulator upper strata by vacuum air pump and import to again bottom accumulator, carry out secondary with oil sample to mix, circulate according to this, until gas is fully dissolved in oil sample, thus make the standard oil sample being dissolved with desired gas concentration.
2. the compound method of characteristic of transformer gas standard oil sample according to claim 1, is characterized in that:
In step (1), described standard oil sample advises that concentration passes judgment on transformer state for foundation setting to use gas dissolved in oil of power trans-formers in IEEEC57.104-2008 " oil-filled transformer produces the description guide of gas ".
3. the compound method of characteristic of transformer gas standard oil sample according to claim 2, is characterized in that:
Characteristic gas standard oil sample comprises standard oil sample 1, standard oil sample 2 and standard oil sample 3;
Wherein, the corresponding transformer fault early warning value of standard oil sample 1, if each concentration of component of Gases Dissolved in Transformer Oil is lower than each gas component concentrations in fault pre-alarming value and standard oil sample 1, then illustrates that transformer is in normal operating condition;
The corresponding Repair of Transformer critical value of standard oil sample 2, if gas dissolved in oil of power trans-formers is higher than each gas component concentrations in maintenance critical value and standard oil sample 2, then judges that transformer breaks down, should overhaul immediately;
Standard oil sample 3 corresponding transformer early warning failure value, if Gases Dissolved in Transformer Oil concentration of component is higher than each gas component concentrations in early warning failure value and standard oil sample 3, then judges that transformer oil excessive decomposition occurs, and continues operation and transformer can be caused to lose efficacy.
4. the compound method of characteristic of transformer gas standard oil sample according to claim 3, is characterized in that:
The suggestion concentration of described standard oil sample 1 is as follows: H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2suggestion concentration be respectively 100ppm, 350ppm, 2500ppm, 120ppm, 50ppm, 65ppm, 1ppm;
The suggestion concentration of described standard oil sample 2 is as follows: H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2suggestion concentration be respectively 700ppm, 570ppm, 4000ppm, 400ppm, 100ppm, 100ppm, 10ppm;
The suggestion concentration of described standard oil sample 3 is as follows: H
2, CO, CO
2, CH
4, C
2h
4, C
2h
6, C
2h
2suggestion concentration be respectively 1800ppm, 1400ppm, 10000ppm, 1000ppm, 200ppm, 150ppm, 35ppm.
5. characteristic of transformer gas standard oil sample compound method according to claim 2, is characterized in that:
In step (1), in the characteristic of transformer gas standard oil sample prepared, concentration data and the deviation calculating gained theoretical concentration according to GT/B17623-1998 " Gas Chromatographic Determination of Dissolved Gases in Insulating Oil component concentration " of each fault characteristic gases component conforms with the regulations requirement, and namely relative deviation is less than 10%.
6. the compound method of characteristic of transformer gas standard oil sample according to claim 1, is characterized in that:
In step (2), described high pure nitrogen refers to that its purity is more than or equal to 99.999%, and described blank oil sample extremely undersaturated condition refers to that the vacuum tightness of blank oil sample is 0.0907-0.0933MPa.
7. the compound method of characteristic of transformer gas standard oil sample according to claim 1, is characterized in that:
In step (2), closed container is made up of silicon steel material, and is provided with the rubber gas injection pad for sealing;
Described homogeneity refers to the area requirement meeting and specify in GB/T17623-1998, and namely the concentration of standard oil sample different parts surveys deviation in 10%.
8., to an evaluation method for characteristic of transformer gas standard oil sample described in the arbitrary claim of claim 1-7, it is characterized in that, described evaluation method comprises the following steps:
(1) propose standard oil sample suggestion concentration according to IEEEC57.104-2008, the characteristic of transformer gas standard oil sample of preparation 3 kinds of variable concentrations, comprises standard oil sample 1, standard oil sample 2, standard oil sample 3;
(2) for the standard oil sample of above-mentioned 3 kinds of variable concentrations, the method all specified according to GB/T7597-2007 under each concentration gathers standard twice oil sample from the hydraulic fluid port of getting of accumulator, according to method described in GB/T17623-1998, with laboratory high-precision chromatography instrumental analysis, get the normal concentration of mean value as each component to be measured of each characteristic gas content in standard twice oil sample;
(3) gas chromatograph to be evaluated is connected with standard oil sample 1,2,3 respectively, to the standard oil sample repeated test 6 times of each concentration, obtain peak height signal and the noise signal of the component each to be measured in each standard oil sample, calculate the minimum detectable concentration of each component of gas chromatograph to be evaluated; According to being tested the characteristic gas component single test concentrations to be measured obtained by gas chromatograph, calculate the standard deviation of the component to be measured in each standard oil sample;
(4) suggestion concentration absolute error and the relative error of being tested characteristic gas component to be measured and this standard oil sample in each standard oil sample obtained by gas chromatograph is calculated, if any gas composition in the characteristic of transformer gas standard oil sample of 3 kinds of variable concentrations and this gas composition in corresponding standard oil sample advise that the relative error of concentration exceedes ± 30%, then need to calibrate gas chromatograph.
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| CN106501425A (en) * | 2016-11-21 | 2017-03-15 | 国网山东省电力公司电力科学研究院 | A kind of compound method of transformer online gc verification standard oil |
| CN106706822A (en) * | 2016-12-27 | 2017-05-24 | 中国西电电气股份有限公司 | Method for measuring content of high concentration dissolved gas to judge fault type of condenser bushing |
| CN106841576A (en) * | 2017-03-28 | 2017-06-13 | 桂林电力电容器有限责任公司 | Experimental rig and method of a kind of high pressure electrical material to dissolved gas in oil |
| CN107831298A (en) * | 2017-09-29 | 2018-03-23 | 中国电力科学研究院 | The method and system of field-checking Gases Dissolved in Transformer Oil monitoring device performance |
| CN109520812A (en) * | 2018-12-17 | 2019-03-26 | 中国电力科学研究院有限公司 | A kind of preparation method of the micro- water oil sample of transformer standard |
| CN109520812B (en) * | 2018-12-17 | 2022-12-13 | 中国电力科学研究院有限公司 | Preparation method of standard micro-water oil sample of transformer |
| CN110211352A (en) * | 2019-06-26 | 2019-09-06 | 河南驰诚电气股份有限公司 | Calibration facility |
| CN110211352B (en) * | 2019-06-26 | 2021-07-30 | 河南驰诚电气股份有限公司 | Calibration equipment |
| CN111157316A (en) * | 2020-01-17 | 2020-05-15 | 中国电力科学研究院有限公司 | Preparation method and application of standard sample for verifying gas component content determination capability |
| CN113804779A (en) * | 2021-08-25 | 2021-12-17 | 艾特智联科技(上海)有限公司 | Device and method for testing analysis performance of online chromatograph |
| CN117147777A (en) * | 2023-10-30 | 2023-12-01 | 广东工业大学 | Checking device and checking method for transformer online detection system |
| CN117147777B (en) * | 2023-10-30 | 2024-02-06 | 广东工业大学 | Checking device and checking method for transformer online detection system |
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Effective date of registration: 20210423 Address after: 400044 Shapingba street, Shapingba District, Chongqing, No. 174 Patentee after: Chen Weigen Address before: 400030 Shapingba District, Sha Sha Street, No. 174, Chongqing Patentee before: Chongqing University |