CN105223286B - 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 PDF

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CN105223286B
CN105223286B CN201510551470.1A CN201510551470A CN105223286B CN 105223286 B CN105223286 B CN 105223286B CN 201510551470 A CN201510551470 A CN 201510551470A CN 105223286 B CN105223286 B CN 105223286B
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oil sample
gas
transformer
standard oil
concentration
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CN105223286A (en
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陈伟根
王有元
李剑
杜林�
崔鲁
王飞鹏
周湶
刘军
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Chongqing University
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Abstract

A kind of compound method and evaluation method of characteristic of transformer gas standard oil sample, the compound method is by preparing the calibrating gas of various concentrations, preparing blank oil sample and being sufficiently mixed the steps such as calibrating gas and blank oil sample, realize the preparation of characteristic of transformer gas standard oil sample, the standard oil sample for the various concentrations that the evaluation method is prepared using the above method, by including minimum detectable concentration, the repeatability of data and accuracy to gas-chromatography performance and evaluating gas chromatograph, so as to realize the thoroughly evaluating to characteristic of transformer gas standard oil sample.The present invention can disposably prepare the standard oil sample for being dissolved with setting characteristic gas concentration, and can improve gas chromatograph quality, to ensure the accuracy of plant running reliability and data.

Description

The preparation of characteristic of transformer gas standard oil sample and evaluation method
Technical field
The invention belongs to insulation of electrical installation monitoring field, a kind of more particularly to characteristic of transformer gas standard oil sample is matched somebody with somebody Method and evaluation method processed.
Background technology
With strong intelligent grid strategy continuous propulsion, transformer as intelligent power transformation link core power equipment, Play the pivotal role for connecting different voltage class power networks in power system, the stabilization of its operational reliability and power system and Safety is closely related, and China's power department has put into the transformation of substantial amounts of manpower, fund and equipment to 220KV aboves Device has installed on-Line Monitor Device additional.It is old with new technology, the appearance of new equipment and the large scale investment of monitoring device operation Detection method can not meet the detection demand of new equipment, and the performance detection means being adapted with new equipment also need foundation badly, with this Improve the dynamics of checking on of transformer monitoring device performance.
At present, the power transformer of China 110KV ratings above is still based on oil-filled transformer, when inside transformer hair Various minimum gas can be produced when heat failure or discharging fault or oil, paper aging.What is dissolved in transformer oil is each Planting the relative populations of gas componant and forming speed has obvious corresponding pass with the energy releasing pattern and fault type of trouble point How much system, can determine whether device interior with the presence or absence of exception, and then infer failure classes according to various gas componant contents Type and fault energy etc., realize repair based on condition of component.Continuous or monitoring in real time is carried out to transformer oil by on-line chromatograph monitor device, The operation conditions of equipment can be grasped at any time, judge whether its operation is normal, the nature of trouble of presence, class inside diagnostic device Type, position and the order of severity and the development trend for predicting failure.With the development of domestic and international chromatographic technique, have been developed that detectable H2、CO、CO2、CH4、C2H4、C2H6、C2H2Deng the chromatogram monitoring device of 7 kinds of constituent contents.But due to chromatograph in itself or other because The influence of element, the problems such as being likely to result in measurement result deviation or insensitive data.Therefore this area chromatogram arrangement equipment need to be grasped Problem present in quality and operation, specification on-line equipment is selected, checked and accepted, equipment in field surveillance detection operation, it is ensured that monitoring Equipment, which is played, should effect.
Chromatographic data and Standard Gases are detected using the calibrating gas of one or more groups of concentration to operating chromatograph The otherness of body, so as to realize the appraisal of online gc, this is examined and determine with metrological service used in the chromatograph in laboratory Method duplicates.The online gc of different manufacturers, due to analysis principle and the otherness of analysis process, result in testing result Difference, less, data deviation is concentrated mainly on oil sample degassing process mode aspect to its chromatographic component detector difference used.Cause This, when only carrying out verifying work to online gc by calibrating gas, has simply verified the detector of equipment, without taking into account Whole process in terms of equipment degassing, so as to cause verifying work to fail.The approach for solving this problem is to utilize to be dissolved with change The standard oil sample demarcation chromatogram arrangement of depressor characteristic gas, and need to carry out thoroughly evaluating to characteristic of transformer gas standard oil sample To improve chromatographic detection apparatus quality.
The content of the invention
In view of this, it is an object of the invention to provide a kind of preparation of characteristic of transformer gas standard oil sample and evaluation side Method.
The preparation of the application characteristic of transformer gas standard oil sample and evaluation method are to be achieved through the following technical solutions 's:
A kind of compound method of characteristic of transformer gas standard oil sample, it is characterised in that the compound method includes following Step:
(1) calibrating gas of setting concentration is prepared:Concentration is advised according to standard oil sample, passes through gas mass flow controller Transformer fault characteristic gas is imported into air chamber by MFC successively, and the fault characteristic gases are H2、CO、CO2、CH4、C2H4、 C2H6、C2H2, so as to make the normal mixture body of the suggestion concentration;
(2) blank oil sample is prepared:Into transformer oil, bubbling injects high pure nitrogen and is sufficiently stirred for, de- using vacuum Gas method is de-gassed to oil sample, is made oil sample be in extreme undersaturated condition, is fully circulated in closed container, keeps blank oil sample Homogeneity, bubbling injection refers to that Nitrogen from vessel bottom is slowly introducing transformer oil in the form of bubbles;
(3) calibrating gas and blank oil sample are sufficiently mixed:Accumulator is vacuumized and quantitative blank oil sample is passed through, by The calibrating gas prepared is slowly imported into accumulator through mass flow controller, and gas is in the form of bubbles in uphill process Contact and dissolve with blank oil, extraction imported into storage to the gas for failing to be dissolved into oil again from accumulator upper strata by vacuum air pump Grease chamber bottom, with oil sample carry out it is secondary mix, circulate, be fully dissolved into oil sample up to gas, so as to make dissolving according to this There is the standard oil sample of required gas concentration.
The present invention further preferably includes following scheme:
In step (1), the standard oil sample advises concentration with IEEE C57.104-2008《Oil-filled transformer is produced The description guide of gas》It is according to setting that middle use gas dissolved in oil of power trans-formers, which judges transformer state,.
Characteristic gas standard oil sample includes 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 Gases Dissolved in Transformer Oil each component concentration is less than Fault pre-alarming value is each gas component concentrations in 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 maintenance critical value I.e. each gas component concentrations in standard oil sample 2, then judge that transformer has broken down, should be overhauled immediately;
The corresponding transformer early warning failure value of standard oil sample 3, if Gases Dissolved in Transformer Oil concentration of component is pre- higher than failure Alert value is each gas component concentrations in standard oil sample 3, then judges that excessive decomposition has occurred for transformer oil, and continuing to run with can cause to become Depressor fails.
Wherein, the suggestion concentration of the standard oil sample 1 is as follows:H2、CO、CO2、CH4、C2H4、C2H6、C2H2Suggestion concentration Respectively 100ppm, 350ppm, 2500ppm, 120ppm, 50ppm, 65ppm, 1ppm;
The suggestion concentration of the standard oil sample 2 is as follows:H2、CO、CO2、CH4、C2H4、C2H6、C2H2Suggestion concentration be respectively 700ppm、570ppm、4000ppm、400ppm、100ppm、100ppm、10ppm;
The suggestion concentration of the standard oil sample 3 is as follows:H2、CO、CO2、CH4、C2H4、C2H6、C2H2Suggestion concentration be respectively 1800ppm、1400ppm、10000ppm、1000ppm、200ppm、150ppm、35ppm。
In step (1), the concentration of each fault characteristic gases component in the characteristic of transformer gas standard oil sample prepared Data with according to GT/B 17623-1998《The Gas Chromatographic Determination of Dissolved Gases in Insulating Oil constituent content》Gained is calculated to manage Meet regulation requirement, i.e. relative deviation by the deviation of concentration and be less than 10%.
In step (2), the high pure nitrogen refers to that its purity is more than or equal to 99.999%, and the blank oil sample is extremely owed Saturation state refers to that the vacuum of blank oil sample is 0.0907-0.0933MPa.
Closed container is made up of silicon steel material, and is provided with for sealed rubber gas injection pad;
The uniformity refers to meet area requirement specified in GB/T17623-1998, i.e. standard oil sample different parts Concentration surveys deviation in 10%.
Disclosed herein as well is a kind of to the above-mentioned evaluation method for stating characteristic of transformer gas standard oil sample, its feature exists In the evaluation method comprises the following steps:
(1) standard oil sample suggestion concentration is proposed according to IEEE C57.104-2008, prepares the transformer of 3 kinds of various concentrations Characteristic gas standard oil sample, including standard oil sample 1, standard oil sample 2, standard oil sample 3;
(2) it is directed under the standard oil sample of above-mentioned 3 kinds of various concentrations, each concentration according to as defined in GB/T 7597-2007 Method takes hydraulic fluid port to gather standard twice oil sample from accumulator, high-precision with laboratory according to GB/T 17623-1998 methods describeds Chromatographic apparatus analysis is spent, takes the average value of each characteristic gas content in standard twice oil sample dense as the standard of each component to be measured Degree;
(3) gas chromatograph to be evaluated is connected with standard oil sample 1,2,3 respectively, to the standard oil of each concentration Sample retest 6 times, obtains the peak height signal and noise signal of each component to be measured in each standard oil sample, calculates to be evaluated Gas chromatograph each component minimum detectable concentration;Obtained characteristic gas group to be measured is tested according to by gas chromatograph Divide single test concentrations, calculate the standard deviation of the component to be measured in each standard oil sample;
(4) calculate and characteristic gas component to be measured and the standard oil in obtained each standard oil sample are tested by gas chromatograph The suggestion concentration absolute error and relative error of sample, if appointing in the characteristic of transformer gas standard oil sample of 3 kinds of various concentrations A gas component of anticipating has exceeded ± 30% with the relative error of gas component suggestion concentration in corresponding standard oil sample, then needs to gas Chromatography is calibrated.
The advantage of the application is:The standard transformer oil sample compound method can disposably obtain being dissolved with known gas dense The standard transformer oil sample of degree, and can be long time stored.It is reachable by the thoroughly evaluating to characteristic of transformer gas standard oil sample To raising power network detection means quality, it is ensured that plant running reliability and the purpose of data accuracy.
Brief description of the drawings
Fig. 1 show the compound method flow chart of characteristic of transformer gas standard oil sample disclosed by the invention;
Fig. 2 show evaluation method schematic flow sheet of the present invention to characteristic of transformer gas standard oil sample.
Embodiment
With reference to compound method and evaluation method of the Figure of description to characteristic of transformer gas standard oil sample of the present invention It is described in detail successively.
It is the compound method flow chart 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) calibrating gas of setting concentration is prepared:With IEEE C57.104-2008《Oil-filled transformer produces gas Guide is described》It is dense according to proposition standard oil sample suggestion that middle use gas dissolved in oil of power trans-formers, which judges transformer state, Degree:Using the corresponding transformer fault early warning value of standard oil sample 1, if Gases Dissolved in Transformer Oil each component concentration is generally less than event Hinder early warning value, then illustrate that transformer is in normal operating condition;Using the corresponding Repair of Transformer critical value of standard oil sample 2, if becoming Depressor oil dissolved gas concentration then illustrates that transformer starts to occur not generally in fault pre-alarming value and maintenance critical value range Normal phenomenon, if continuing to run with and gas component concentrations are generally higher than maintenance critical value, illustrates that transformer oil is largely decomposed, Transformer may break down, and should be overhauled immediately;Using the corresponding transformer early warning failure value of standard oil sample 3, if transformation Device oil dissolved gas concentration of component is generally higher than early warning failure value, then illustrates that excessive decomposition has occurred for transformer oil, continues to transport Guild causes transformer to fail.
Concentration is advised according to standard oil sample, by gas mass flow controller MFC successively by 7 kinds of transformer fault features Gas is imported into air chamber, so as to make the normal mixture body of setting concentration;The characteristic of transformer gas standard prepared In oil sample the concentration data of each component with according to GT/B 17623-1998《The gas phase color of Dissolved Gases in Insulating Oil constituent content Compose determination method》The deviation for calculating gained theoretical concentration meets regulation requirement, i.e., relative deviation is less than 10%.
Table 1:Standard oil sample advises concentration (unit:μL/L)
Gas component Standard oil sample 1 Standard oil sample 2 Standard oil sample 3
H2 100 700 1800
CH4 120 400 1000
C2H2 1 10 35
C2H4 50 100 200
C2H6 65 100 150
CO 350 570 1400
CO2 2500 4000 10000
(2) blank oil sample is prepared:Purity is slowly introducing change in the form of bubbles for 99.999% Nitrogen from vessel bottom Depressor oil, and be sufficiently stirred for, oil sample is de-gassed using vacuum outgas method, makes oil sample be in extreme undersaturated condition, Vacuum is 0.0907-0.0933MPa, is fully circulated in closed container, ensures the homogeneity of oil sample, and uniformity meets GB/ The concentration deviation of area requirement specified in T17623-1998, i.e. standard oil sample different parts is in 10%;Closed container is by silicon Steel material is made, and is provided with for sealed rubber gas injection pad.
(3) calibrating gas and blank oil sample are sufficiently mixed:Accumulator is vacuumized and quantitative blank oil sample is passed through, matched somebody with somebody The calibrating gas made is slowly imported into accumulator through mass flow controller, gas in the form of bubbles in uphill process with Blank oil, which is contacted, simultaneously to be dissolved, and is failed to be dissolved into gas in oil and is extracted out by vacuum air pump from accumulator upper strata and imported into oil storage again Room bottom, with oil sample carry out it is secondary mix, circulate according to this, be fully dissolved into oil sample up to gas, be dissolved with so as to make The standard oil sample of required gas concentration.
Cil=Ki × Cig
Cil:Under equilibrium condition, the concentration in the liquid of dissolved gas i components;
Cig:Under equilibrium condition, the concentration in the gas of dissolved gas i components;
Ki:Under test temperature, the distribution coefficient of dissolved gas i components after air-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, The evaluation method, comprises the following steps:
(1) it is to ensure the validity of gas chromatograph appraisal, it is necessary to realized by different standard oil samples.Foundation IEEE C57.104-2008 propose standard oil sample suggestion concentration, prepare the characteristic of transformer gas standard oil of 3 groups of various concentrations Sample, including standard oil sample 1, standard oil sample 2, standard oil sample 3;
(2) it is directed under the standard oil sample of above-mentioned 3 kinds of various concentrations, each concentration according to as defined in GB/T 7597-2007 Method takes hydraulic fluid port to gather two standard oil samples from accumulator, high-precision with laboratory according to GB/T 17623-1998 methods describeds Chromatographic apparatus analysis is spent, takes the average value of each characteristic gas content in two standard oil samples dense as the standard of each component to be measured Degree;
(3) gas chromatograph to be evaluated is connected with standard oil sample 1, retest 6 times utilizes gas phase to be evaluated Chromatographic monitoring system obtains the peak height signal and noise signal of each component to be measured.
The a certain characteristic gas component minimum detection calculated in the standard oil sample 1 that gas chromatograph to be evaluated is detected is dense The formula of degree:
Cmin:The minimum detectable concentration (μ L/L) of characteristic gas component to be measured;
Cs: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 the repeatability and accuracy of the characteristic gas component to be measured of standard oil sample 1:
Calculate the formula of the characteristic gas Component Standard deviation to be measured of standard oil sample 1:
Calculate the formula of the characteristic gas component relative standard deviation to be measured of standard oil sample 1:
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;
Ci: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 unitses, value is 6 herein.
The relative standard deviation RSD of each gas component should be not more than 5%, to ensure repeatability.
Calculate the formula of the characteristic gas component absolute error to be measured of standard oil sample 1:
Calculate the formula of the characteristic gas component relative error to be measured of standard oil sample 1:
E:The absolute error (μ L/L) of characteristic gas component to be measured;
RE:The relative error (%) of characteristic gas component to be measured.
After gas chromatograph to be evaluated is completed to the detection of standard oil sample 1, successively it is connected with standard oil sample 2,3, each The same retest of oil sample 6 times, is respectively calculated according to above-mentioned steps.
(4) standard of verification gas chromatograph is proposed:By gas chromatograph detection data and standard oil sample to be evaluated Concentration is compared, if the relative error R of each gas componentEExceed ± 30%, then needed to calibrate gas chromatograph.
Above-described embodiment does not limit the present invention in any way, all to be obtained by the way of equivalent substitution or equivalent transformation Technical scheme, be within the scope of the present invention.

Claims (4)

1. a kind of compound method of characteristic of transformer gas standard oil sample, it is characterised in that the compound method includes following step Suddenly:
(1) calibrating gas of setting concentration is prepared:Concentration is advised according to standard oil sample, passes through gas mass flow controller MFC Transformer fault characteristic gas is imported into air chamber successively, the fault characteristic gases are H2、CO、CO2、CH4、C2H4、C2H6、 C2H2, so as to make the normal mixture body of the suggestion concentration;The standard oil sample advises concentration with IEEE C57.104- 2008《Oil-filled transformer produces the description guide of gas》Middle use gas dissolved in oil of power trans-formers judges transformer shape State is according to setting;
(2) blank oil sample is prepared:Into transformer oil, bubbling injects high pure nitrogen and is sufficiently stirred for, using vacuum outgas Method is de-gassed to oil sample, is made oil sample be in extreme undersaturated condition, is fully circulated in closed container, keeps blank oil sample Homogeneity, the bubbling injection refers to that Nitrogen from vessel bottom is slowly introducing transformer oil in the form of bubbles;
(3) calibrating gas and blank oil sample are sufficiently mixed:Accumulator is vacuumized and quantitative blank oil sample is passed through, will have been matched somebody with somebody The calibrating gas made is slowly imported into accumulator through mass flow controller, gas in the form of bubbles in uphill process with Blank oil, which is contacted, simultaneously to be dissolved, and is failed to be dissolved into gas in oil and is extracted out by vacuum air pump from accumulator upper strata and imported into oil storage again Room bottom, with oil sample carry out it is secondary mix, circulate according to this, be fully dissolved into oil sample up to gas, be dissolved with so as to make The standard oil sample of required gas concentration;
The characteristic gas standard oil sample includes 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 Gases Dissolved in Transformer Oil each component concentration is less than failure Early warning value is each gas component concentrations in 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 mark higher than maintenance critical value Each gas component concentrations in quasi- oil sample 2, then judge that transformer has broken down, should be overhauled immediately;
The corresponding transformer early warning failure value of standard oil sample 3, if Gases Dissolved in Transformer Oil concentration of component is higher than early warning failure value I.e. each gas component concentrations in standard oil sample 3, then judge that excessive decomposition has occurred for transformer oil, transformer can be caused by continuing to run with Failure;
The suggestion concentration of the standard oil sample 1 is as follows:H2、CO、CO2、CH4、C2H4、C2H6、C2H2Suggestion concentration be respectively 100ppm、350ppm、2500ppm、120ppm、50ppm、65ppm、1ppm;
The suggestion concentration of the standard oil sample 2 is as follows:H2、CO、CO2、CH4、C2H4、C2H6、C2H2Suggestion concentration be respectively 700ppm、570ppm、4000ppm、400ppm、100ppm、100ppm、10ppm;
The suggestion concentration of the standard oil sample 3 is as follows:H2、CO、CO2、CH4、C2H4、C2H6、C2H2Suggestion concentration be respectively 1800ppm、1400ppm、10000ppm、1000ppm、200ppm、150ppm、35ppm。
2. characteristic of transformer gas standard oil sample compound method according to claim 1, it is characterised in that:
In step(1)In, the concentration data of each fault characteristic gases component in the characteristic of transformer gas standard oil sample prepared With foundation GT/B 17623-1998《The Gas Chromatographic Determination of Dissolved Gases in Insulating Oil constituent content》Calculate gained theoretical dense The deviation of degree meets regulation requirement, i.e. relative deviation and is less than 10%.
3. the compound method of characteristic of transformer gas standard oil sample according to claim 1, it is characterised in that:
In step(2)In, the high pure nitrogen refers to that its purity is more than or equal to 99.999%, the blank oil sample extreme undersaturation State refers to that the vacuum of blank oil sample is 0.0907-0.0933MPa.
4. the compound method of characteristic of transformer gas standard oil sample according to claim 1, it is characterised in that:
In step(2)In, closed container is made up of silicon steel material, and is provided with for sealed rubber gas injection pad;
It is different that the homogeneity of the blank oil sample refers to meet area requirement specified in GB/T17623-1998, i.e. standard oil sample The concentration at position surveys deviation in 10%.
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CN105929049B (en) * 2016-04-19 2018-05-29 国家电网公司 A kind of universal portable oil dissolved gas on-line computing model calibration equipment
CN105785244B (en) * 2016-04-21 2017-02-08 陈盈洁 Method of determining insulation characteristics of novel transformer oil
CN106501425B (en) * 2016-11-21 2019-01-11 国网山东省电力公司电力科学研究院 A kind of transformer online gc verification preparation method of 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
CN107831298B (en) * 2017-09-29 2021-06-22 中国电力科学研究院 Method and system for on-site checking performance of dissolved gas monitoring device in transformer oil
CN110211352B (en) * 2019-06-26 2021-07-30 河南驰诚电气股份有限公司 Calibration equipment

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KR101075584B1 (en) * 2009-09-29 2011-10-21 한국전력공사 System and method for manufacturing the standard insulating oil
CN102706992A (en) * 2012-05-04 2012-10-03 河北省电力研究院 Preparation device and preparation method of blank oil sample of transformer
CN203365394U (en) * 2013-07-08 2013-12-25 国家电网公司 Testing device applicable to device for monitoring gas dissolved in transformer oil online
CN103558078B (en) * 2013-11-01 2017-02-15 北京华电云通电力技术有限公司 Preparation method for standard transformer oil sample
CN104849434B (en) * 2015-05-28 2017-03-22 广西电网有限责任公司电力科学研究院 System for calibrating accuracy of instrument for detecting gas dissolved in oil

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