CN107843788A - A kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas - Google Patents

A kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas Download PDF

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CN107843788A
CN107843788A CN201711049819.7A CN201711049819A CN107843788A CN 107843788 A CN107843788 A CN 107843788A CN 201711049819 A CN201711049819 A CN 201711049819A CN 107843788 A CN107843788 A CN 107843788A
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condition
failures
gas
fault
ratio
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赵安新
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Xian University of Science and Technology
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Xian University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials

Abstract

The invention discloses a kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas, proposes that one kind uses four kinds of fuel gas H2、CH4、C2H2、C2H4Four kinds of relative ratios and the combination of six kinds of Gas Ratios fault diagnosis computation model and method, according to the computation model of setting, so as to the simple and quick method for judging six kinds of internal faults of transformer.

Description

A kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas
【Technical field】
The invention belongs to technical field of electric power, and in particular to a kind of failure that oil-immersed type transformer is carried out using characteristic gas is examined Disconnected method.
【Background technology】
Oil immersed power transformer is one of nucleus equipment crucial in current power system, it can be ensured that electric power energy it is steady Fixed and transmitting.Any failure may all cause tremendous influence and economic loss.Therefore, as early as possible discovery or detection Inside is without failure with regard to most important.
At present, the method for being mainly used to carry out oil immersed power transformer internal fault is DGA, and most widely used. The insulation system of oil immersed power transformer is typically all to use insulating oil liquid and solid (cellulose paper and cardboard) insulation system Form, wherein fluid insulation oil is that a kind of mixed by a variety of hydrocarbon molecules is formed, and it is made up of saturated hydrocarbons. In addition, solid insulation (paper, cardboard and plank) is made up of substantial amounts of dewatered grape saccharic acid ring, weak C-O molecular links, glycosidic bond, These chemical bonds easily decompose in transformer oil heat, stable without hydrocarbon, and it typically can will in lower temperature Decompose.When anomaly occurs, such as overheat, shelf depreciation, arc discharge insulation breakdown etc., then the liquid in transformer Accordingly it can be influenceed and then decomposed with solid insulating material, produce different gas, it is exhausted that these gases can be dissolved in liquid In edge oil.The internal fault of distribution and concentration and oil-immersed type transformer of these gases in insulating oil has certain association and closed System, it can reveal that the fault type of inside and the degree of failure.This is also dissolved gas in oil analysis (DGA, Dissolved Gas Analysis basic point of departure and principle), by the analysis of concentration of dissolved gas, the generation speed of gas, certain gas Ratio, DGA methods may decide that the internal fault of transformer.The main gas collected and analyzed is H2,CH4,C2H2,C2H4, C2H6, CO and CO2.IEC 60599 and IEEE C57.104 standards provide basic guide and the method for DGA analyses.Such as IEEE The key gas analytic approach (key gases) that is there is provided in C57.104, Doernenburg ratios (Doernenburg ratios), Rogers ratios (Rogers Ratio), three Gas Ratio methods (the three basic gas provided in IEC 60599 Ratio), polygon method (the Duval triangle), these DGA means of interpretation is fairly simple, easy-to-use, but its is accurate Property have much room for improvement, and need according to scene situation need to make a concrete analysis of.Wherein, key gas analysis method is difficult to determine that Kind gas accounts for leading role, and whether secondary gas should be included in the total amount of calculating.Gas Ratio method is only used only three Kind or four kinds of Gas Ratios, so as to cause some regions analysis not to be described by these result of calculations, it is difficult to determine failure Accuracy.Polygon is to be based on relative three kinds of gas (CH4,C2H2,C2H4) percentage, equally relatively low hundred Divide than following it is difficult to provide the diagnosis of failure.
For these problems, in recent years, many researchers and engineer start to apply artificial intelligence, such as neutral net, SVMs, PLS, wavelet transformation, expert system and fuzzy set etc. improve the accuracy of fault diagnosis.It is fuzzy Although collecting system can be very good to handle non-boundary and uncertain problem, but can not learn former fault diagnosis knot Fruit, it is thus impossible to automatically adjust diagnostic rule according to diagnostic history and diagnosis process.Asked for processing non-boundary and uncertainty Topic, using having the methods of artificial neural network, SVM, PLS, wavelet transformation, expert system and fuzzy set Supervised learning ability improves the accuracy of fault diagnosis, but it is more complicated that these methods, which use,.
【The content of the invention】
It is an object of the invention to provide a kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas, to solve The defects of above-mentioned prior art.
The present invention uses following technical scheme:A kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas, Specifically implement according to following steps:
The content value of five kinds of dissolved gas in step 1, collection transformer oil is as fault data, five kinds of gas H2、CH4、C2H2、C2H4And C2H6, calculate Gas Ratio R1, R2, R3, R5, R6 and R10;
Wherein, R1 CH4With H2Measure the ratio of concentration, R2 C2H2With C2H4Measure ratio, the R3 C of concentration2H2With CH4Measure ratio, the R5 C of concentration2H4With C2H6Measure ratio, the R6 C of concentration2H4With CH4Measure concentration ratio and R10 is C2H2With H2Measure the ratio of concentration;
Define PD and represent partial discharges fault, D1 represents low energy discharge fault, and D2 represents high-energy discharge failure, T1 generations Exterior heat failure T<300 DEG C of failures, T2 represent 300 DEG C of hot stall<T<700 DEG C of failures, T3 represent hot stall T>700 DEG C of failures;
Step 2, definition condition 1 are R2>0.4 and R1<500, or %H2>90 and %CH4>96,
By R2 and R1, or %H2And %CH4It is compared with condition 1:
If meeting condition 1, it is determined as electric fault, judgement again is carried out subsequently into step 3;
If being unsatisfactory for condition 1, it is determined as hot stall, judgement again is carried out subsequently into step 5;
Step 3, definition condition 2 are %C2H2<13, by %C2H2It is compared with condition 2:
If meeting condition 2, this fault diagnosis is judged for PD failures, this time judges to terminate;
If condition 2 is not satisfied, be then determined as D1/D2 failures, judgement again is carried out subsequently into step 4;
Step 4, definition condition 3 are %C2H4<23.3 or R3>15, by %C2H4Or R3 is compared with condition 3:
If meeting condition 3, this fault diagnosis is judged for D1 failures, this time judges to terminate;
If being unsatisfactory for condition 3, this fault diagnosis is judged for D2 failures, this time judges to terminate;
Step 5, definition condition 4 are R5>3.5 and R10>0.015, or R6>0.8~0.6 and R1>2.6, by R5 and R10, or R6 and R1 is compared with condition 4:
If meeting condition 4, judge this fault diagnosis for T3 failures;
If being unsatisfactory for condition 4, it is determined as T1/T2 failures, judgement again is carried out subsequently into step 6;
Step 6, definition condition 5 are R2>0.0005 and R5<=2 or 0.0005<R2<=0.02 and 2<R5<=4.68, will R2 and R5 is compared with condition 5:
If meeting condition 5, this fault diagnosis is judged for T1 failures, this time judges to terminate;
If being unsatisfactory for condition 5, this fault diagnosis is judged for T2 failures, this time judges to terminate.
The beneficial effects of the invention are as follows:It is proposed that one kind uses four kinds of fuel gas H2、CH4、C2H2,、C2H4Four kinds it is relative Ratio and the fault diagnosis computation model and method of six kinds of Gas Ratio combinations, according to the computation model of setting, so as to simple fast The method for judging six kinds of internal faults of transformer of speed.
【Brief description of the drawings】
Fig. 1 is fault verification and the knowledge of a kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas of the present invention Other schematic flow sheet.
【Embodiment】
Below by drawings and examples, technical scheme is described in further detail.
It is proposed by the present invention the invention provides a kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas Method is to use five kinds of fuel gas H2、CH4、C2H2、C2H4、C2H6As characteristic gas, by four kinds of relative ratios of characteristic gas The explanation and classification of failure are carried out with six kinds of Gas Ratio combinations.Four kinds of relative ratios are %H2, %CH4, %C2H2And %C2H4, Six kinds of Gas Ratios:R1 is CH4With H2Measure the ratio of concentration, R2 C2H2With C2H4Measure ratio, the R3 C of concentration2H2With CH4Measure ratio, the R5 C of concentration2H4With C2H6Measure ratio, the R6 C of concentration2H4With CH4Measure concentration ratio and R10 is C2H2With H2Measure the ratio of concentration.
In the prior art, the acquisition of characteristic gas information has two kinds of forms:(1) oil-immersed type transformer is typically used and adopted offline Sample, also just say and gather a certain amount of transformer oil in oil-immersed type transformer production ports, then transformer oil is taken to the detection of formulation Mechanism or assay laboratory are analyzed using oil chromatogram analysis instrument, obtain the content of oil dissolved gas, gas content list Position is PPM or %.(2) oil-immersed type transformer is inherently provided with oil chromatogram analysis instrument, can directly obtain solution gas in oil The content of body, both collecting methods calculate result and are referred to as dissolved gas analysis (that is to say DGA) to final, The gaseous species of analysis are generally H2、CH4、C2H2、C2H4、C2H6, CO and CO2Deng seven kinds of gases.
Only with H in the present invention2、CH4、C2H2、C2H4、C2H6Five kinds of gases, and use what is calculated H2、CH4、C2H2、C2H4、C2H6The concentration measurement of five kinds of gas, the data directly inputted are exactly the content of above-mentioned five kinds of gas Value.Input after the content value of five kinds of gas, (R2 and R1 or %H is namely calculated according to the computational methods of offer2And %CH4) The judgement of carry out condition 1.
As shown in figure 1, the present invention it is a kind of using characteristic gas carry out oil-immersed type transformer method for diagnosing faults specifically according to Following steps are implemented:
Step 1, the content value of five kinds of gas of input are H as fault data, five kinds of gases2、CH4、C2H2、C2H4And C2H6
Then five kinds of conditions (also with regard to saying it is five kinds of situations) of the fault verification proposed according to form 1 carry out oil-immersed type transformer Fault verification, the fault type of oil immersed power transformer internal fault and corresponding coding are with reference to table 2.
Step 2, condition 1 is made to be R2>0.4 and R1<500, or %H2>90 and %CH4>96, according to the fault data meter Gas Ratio R2 and R1 are calculated, or calculates gas content %H2And %CH4, and it is compared with condition 1:
If meeting condition 1, it is determined as electric fault, judgement again is carried out subsequently into step 3;
If being unsatisfactory for condition 1, it is determined as hot stall, judgement again is carried out subsequently into step 5;
Step 3, condition 2 is made to be %C2H2<13, gas content %C is calculated according to the fault data2H2And by itself and bar Part 2 is compared:
If meeting condition 2, this fault diagnosis is judged for PD failures, this time judges to terminate;
If condition 2 is not satisfied, be then determined as D1/D2 failures, judgement again is carried out subsequently into step 4;
Step 4, condition 3 is made to be %C2H4<23.3 or R3>15, gas content %C is calculated according to the fault data2H4Or Gas Ratio R3, and it is compared with condition 3:
If meeting condition 3, judge this fault diagnosis for D1 failures;
If being unsatisfactory for condition 3, judge this fault diagnosis for D2 failures;
Step 5, condition 4 is made to be R5>3.5 and R10>0.015, or R6>0.8~0.6 and R1>2.6, according to the number of faults According to calculating Gas Ratio R5 and R10, or R6 and R1, and it is compared with condition 4:
If meeting condition 4, judge this fault diagnosis for T3 failures;
If being unsatisfactory for condition 4, it is determined as T1/T2 failures, judgement again is carried out subsequently into step 6;
Step 6, condition 5 is made to be R2>0.0005 and R5<=2 or 0.0005<R2<=0.02 and 2<R5<=4.68, according to The fault data calculates Gas Ratio R2 and R5, and it is compared with condition 5:
If meeting condition 5, judge this fault diagnosis for T1 failures;
If being unsatisfactory for condition 5, judge this fault diagnosis for T2 failures.
The particular content of each condition in above method step is as shown in table 1 below:
Above-mentioned each fault type and fault type coding is as shown in table 2 below, wherein, F0Represent no failure, F7Represent electricity Failure, F8Represent hot stall, F9Represent T1/T2, F10Represent D1/D2.
Table 2
A kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas of the present invention, first by condition 1 Judgement belongs to hot stall or electric fault, and fault data then is divided into two groups, 1) electric fault group and 2) hot stall group.Its In, the concrete meaning of condition 1- conditions 5 is as shown in table 1.Next, two groups of fault data is carried out separating diagnosis.Secondly will What fault data met condition 2 is divided into PD groups, and remaining fault data is divided into D1/D2 groups.Carried out according to Fig. 1 flow order Sequence of maneuvers and judgement, so as to judge and be identified as PD, D1, D2, T1, T2 and T3 by fault data.
Oil immersed power transformer internal fault is divided into electric and hot stall in IEC 60599, IEEE C57.104 standards, Wherein fault type and description is as shown in table 2, and table 2 lists to be set for convenience in fault type, failure-description, and the present invention The malfunction coding put.Electric fault can be divided into shelf depreciation (PD), low energy electric discharge (D1), high-energy discharge (D2).Hot event Barrier is divided into three types according to the temperature of trouble point:T<300℃(T1)、300<T<700℃(T2)、T>700℃(T3).
The gas dissolved in oil and the type association of insulating materials and failure are as shown in table 3.When in lower temperature, Mainly produce H2,CH4,C2H6, in higher temperature, substantial amounts of C can be produced2H4..When compared with bottom energy electric fault, such as electricity Corona H2,CH4It can produce, as low energy spark discharge or high-energy electric fault such as electric arc, substantial amounts of C2H2It can produce It is raw, CO and CO2Can be with the aging of cellulose and the hot stall of cellulose and then generation.In this several gas, H2Can except Failure outside the fault type of cellulose aging can all produce.Table 3 illustrates the characteristic and gas that every kind of failure produces gas The composition of body component.
Produce gas Trace:It is micro
Table 3
According to table 3, the present invention have selected four kinds of fuel gas H2,CH4,C2H2,C2H4To form four kinds of relative scale (% H2, %CH4, %C2H2and%C2H4), specific formula for calculation is as follows:
Wherein:X=(CH4), y=(C2H2), z=(C2H4), unit ppm, TDG:Total combustible gas, unit ppm.
In the present invention according to the data of test gas, the significance level for summing up gas relative percentage is arranged, such as table 4 It is shown.As can be drawn from Table 4, H2It is to be easiest to caused gas, CH in electric discharge and overheating fault4Produce at a temperature of the bottom of compared with T1 failures caused by overheat, C2H2Generally produce in failure, C caused by D1 or D22H4Generally produce in higher temperature and D2 T2 or T3 failures caused by failure.Therefore H2、C2H2It is effective in electrical discharge fault diagnosis is involved.
Failure gas PD D1 D2 T3 T1/T2
%H2
%CH4
%C2H2
%C2H4
⑤:The importance of maximum importance, 1. minimum
Table 4
In order to determine the classification of carry out failure which kind of Gas Ratio can be apparent from, five kinds of gas componant (H2,CH4, C2H2,C2H4And C2H6) 10 kinds of Gas Ratios are combined into, as shown in table 5.Table 5 illustrates Gas Ratio analysis result to gas Ratio is important, and can therefrom show that R1, R2, R8, and R9 can be clearly can distinguish hot stall and electric fault, and R3 can be with Very clear differentiation PD/D1 failures and D2 failures, the differentiation PD failures and D1/D2 failures that R6 can will be apparent that, while can be with area Divide T3 failures and T1/T2 failures.The differentiation PD failures and D1/D2 failures that R4, R5 and R10 can will be apparent that.
√:It can distinguish.
Table 5
Embodiment:
Test data of the present invention according to actually occur 122 transformer faults collected, these data come from 6 Different types of oil immersed type electrical equipment (such as:With or without OLTP power transformer, reactor, instrument transformer, set Pipe and cable).The corresponding six kinds of fault types of these fault datas:PD, T1, T2, T3, D1 and D2.In the test process of the present invention In, the data in laboratory foreclose.So as to therefrom choose 117 fault datas as test data.
Method proposed by the present invention and other method all use above-mentioned test data as test set, the percentage correctly diagnosed Than the calculating with uniformity with reference to equation below:
Wherein:
Fn:Fault type encodes (n=0,1,2,3,4,5,6,7,8,9),
RFn:The quantity correctly diagnosed for failure Fn,
SFn:Success correctly diagnose hundred parts than (%),
CFn:The half point ratio (%) that success uniformity correctly diagnoses.
Comparative analysis test the results are shown in Table interpretation of result of the 6 different method for diagnosing faults to every kind of fault type.Such as Fruit failure is not easily discriminated, then by SFnIt is arranged to 0.
type MO MA MB MC MD ME MF
F1 9 9 9 9 0 0 4
F2 26 25 21 21 0 0 16
F3 48 47 47 47 41 41 41
F4 7 7 3 5 U U 3
F5 9 9 8 6 U U 6
F6 18 18 16 16 U 11 11
SF1(%) 100 100 100 0 0 44.4444
SF2(%) 96.1538 80.7692 80.7692 0 0 61.5384
SF3(%) 97.9166 97.9166 97.9166 85.4166 85.4166 85.4166
SF4(%) 100 42.8571 71.4285 0 0 42.8571
SF5(%) 100 88.8888 66.6666 0 0 66.6666
SF6(%) 100 88.8888 88.8888 0 61.1111 61.1111
C (%) 99.0117 83.2201 84.2783 14.2361 24.4213 60.3390
Table 6
S:The percentage (%) that success correctly diagnoses,
C:The percentage (%) that success uniformity correctly diagnoses,
U:It is not easy the fault data distinguished,
MO:The case number of cases of primary fault data
MA,MB,MC,MD,ME,MF:Represent method proposed by the present invention, KimSW methods respectively, your triangle (Duval of Dewar ), Triangles Doernenburg ratios (Doernenburg ratio), Rogers ratios (Rogers ratio), basic three The number of faults that ratio etc. correctly diagnoses.
Method proposed by the present invention can be seen that in S by the test result of table 6Fn(hundred parts of ratios that success correctly diagnoses) And CFnOther four kinds diagnosis computational methods are superior in terms of indexs such as (the half point ratios that success uniformity correctly diagnoses).
Performance except using uniformity evaluate the above method, the accuracy of every kind of method are also counted accordingly Calculate.In the present invention, accuracy is divided into two classes:Accuracy (AU) it is the accident (T being difficult to differentiate between based on exclusionU) sum, accurately Property (AT) it is to be based on accident (TC) sum, its calculation formula is as follows:
Wherein:TR:Correct fault diagnosis quantity, TU:The fault diagnosis quantity being difficult to differentiate between, TC:Failure total amount, TW:It is wrong The quantity of wrong diagnosis failure.
Table 7 is the accuracy (A of various method for diagnosing faultsU and AT) contrast form.
Method for diagnosing faults TC TU TR TW AU(%) AT(%)
Method proposed by the present invention 117 117 115 2 98.2906 98.2906
KimSW methods 117 117 102 15 87.1795 87.1795
Duval triangles 117 117 104 13 88.8889 88.8889
Doernenburg ratios 117 95 53 42 55.7895 45.2991
Rogers ratios 117 72 52 10 72.2222 44.4444
Basic three ratio 117 95 59 36 62.1053 50.4274
Table 7
The method contrasted in table 7 is IEC 60599 and IEEE C57.104 as the purpose used with existing method is Standard provides basic guide and the method for DGA analyses.Such as the key gas analytic approach (key provided in IEEE C57.104 Gases), Doernenburg ratios (Doernenburg ratios), Rogers ratios (Rogers Ratio), IEC 60599 The three Gas Ratio methods (three basic gas ratio) of middle offer, polygon method (the Duval triangle), these DGA means of interpretation is fairly simple, easy-to-use, but its accuracy has much room for improvement, and needs to need to have according to the situation at scene Body is analyzed.Wherein, key gas analysis method is difficult to determine that gas accounts for leading role, and whether secondary gas should It is included in the total amount of calculating.Three kinds or four kinds of Gas Ratios are only used only in Gas Ratio method, so as to cause some regions not by Analysis is described in these result of calculations, it is difficult to determine the accuracy of failure.Polygon is to be based on relative three kinds of gases (CH4,C2H2,C2H4) percentage, equally below relatively low percentage be difficult provide failure differentiation.In the prior art Equipment it is high without this method in accuracy, and this method design is very simple, implements and is easy to, the side of prior art Method sometimes have no idea it is specific judge it is any in PD, D1, D2, T1, T2 or T3 to particularly belonging to.To sum up, this method is just It is that failure to be judged is any of six kinds of PD, D1, D2, T1, T2, T3 on earth.What the method that prior art provides had can only sentence Fix and belong to hot stall or electric fault, either D1, D2, which are not distinguished, or T1, T2 are not distinguished, etc. similar such asks Topic.

Claims (1)

1. a kind of method for diagnosing faults that oil-immersed type transformer is carried out using characteristic gas, it is characterised in that specifically according to following step It is rapid to implement:
Step 1, the content value of five kinds of dissolved gas in collection transformer oil as fault data, five kinds of gas are H2、 CH4、C2H2、C2H4And C2H6, calculate Gas Ratio R1, R2, R3, R5, R6 and R10;
Wherein, R1 CH4With H2Measure the ratio of concentration, R2 C2H2With C2H4Measure ratio, the R3 C of concentration2H2With CH4Survey Measure ratio, the R5 C of concentration2H4With C2H6Measure ratio, the R6 C of concentration2H4With CH4Measure concentration ratio and R10 be C2H2With H2Measure the ratio of concentration;
Define PD and represent partial discharges fault, D1 represents low energy discharge fault, and D2 represents high-energy discharge failure, and T1 represents heat Failure T<300 DEG C of failures, T2 represent 300 DEG C of hot stall<T<700 DEG C of failures, T3 represent hot stall T>700 DEG C of failures;
Step 2, definition condition 1 are R2>0.4 and R1<500, or %H2>90 and %CH4>96,
By R2 and R1, or %H2And %CH4It is compared with condition 1:
If meeting condition 1, it is determined as electric fault, judgement again is carried out subsequently into step 3;
If being unsatisfactory for condition 1, it is determined as hot stall, judgement again is carried out subsequently into step 5;
Step 3, definition condition 2 are %C2H2<13, by %C2H2It is compared with condition 2:
If meeting condition 2, this fault diagnosis is judged for PD failures, this time judges to terminate;
If condition 2 is not satisfied, be then determined as D1/D2 failures, judgement again is carried out subsequently into step 4;
Step 4, definition condition 3 are %C2H4<23.3 or R3>15, by %C2H4Or R3 is compared with condition 3:
If meeting condition 3, this fault diagnosis is judged for D1 failures, this time judges to terminate;
If being unsatisfactory for condition 3, this fault diagnosis is judged for D2 failures, this time judges to terminate;
Step 5, definition condition 4 are R5>3.5 and R10>0.015, or R6>0.8~0.6 and R1>2.6, by R5 and R10, or R6 and R1 is compared with condition 4:
If meeting condition 4, judge this fault diagnosis for T3 failures;
If being unsatisfactory for condition 4, it is determined as T1/T2 failures, judgement again is carried out subsequently into step 6;
Step 6, definition condition 5 are R2>0.0005 and R5<=2 or 0.0005<R2<=0.02 and 2<R5<=4.68, by R2 and R5 is compared with condition 5:
If meeting condition 5, this fault diagnosis is judged for T1 failures, this time judges to terminate;
If being unsatisfactory for condition 5, this fault diagnosis is judged for T2 failures, this time judges to terminate.
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王海鹏 等: "基于气体组分比组合的变压器故障诊断方法研究", 《水电能源科学》 *

Cited By (3)

* Cited by examiner, † Cited by third party
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CN108983052A (en) * 2018-07-26 2018-12-11 武汉大学 One kind being based on SF6The three classes failure triangle diagnostic method of air insulating device decomposition components
CN108983052B (en) * 2018-07-26 2021-02-19 武汉大学 Based on SF6Triangle diagnosis method for three types of faults of decomposition components of gas insulation equipment
CN110888025A (en) * 2019-11-27 2020-03-17 华东师范大学 GIS equipment fault judgment method based on machine learning

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