CN106991450A - A kind of appraisal procedure of oil chromatography transformer safety state - Google Patents
A kind of appraisal procedure of oil chromatography transformer safety state Download PDFInfo
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- CN106991450A CN106991450A CN201710239553.6A CN201710239553A CN106991450A CN 106991450 A CN106991450 A CN 106991450A CN 201710239553 A CN201710239553 A CN 201710239553A CN 106991450 A CN106991450 A CN 106991450A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/24—Classification techniques
- G06F18/241—Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches
- G06F18/2415—Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on parametric or probabilistic models, e.g. based on likelihood ratio or false acceptance rate versus a false rejection rate
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/25—Fusion techniques
- G06F18/251—Fusion techniques of input or preprocessed data
Abstract
The application is related to power transmission and transforming equipment safety and reliability assessment technical field, more particularly to a kind of appraisal procedure of oil chromatography transformer safety state.This method includes：The sample data of oil chromatography transformer is gathered, according to the sample data, the oxygen content rank of the transformer is determined；According to the oxygen content rank of the transformer, the threshold value of the safe class of the transformer is determined；According to the content value of associated gas in the sample data, the fault energy intensity of the transformer is determined；According to the threshold value and the fault energy intensity, the fault energy intensity index of the transformer is determined；According to the fault energy intensity index, the safe condition grade of the transformer is obtained.This method needs the threshold value set few, calculates simple, is with a wide range of applications.
Description
Technical field
The application is related to power transmission and transforming equipment safety and reliability assessment technical field, more particularly to a kind of oil chromatography transformer
The appraisal procedure of safe condition.
Background technology
With cooling oil medium under running environment effect physics and chemical change can occur for the insulation of power transformer, crack
Produce a small amount of fuel gas methane (CH4), ethane (C2H6), ethene (C2H4), acetylene (C2H2), hydrogen (H2), carbon monoxide (CO)
With carbon dioxide (CO2) etc..These gas components being dissolved in oil medium reflect transformer to a certain extent with content
The degree of insulation ag(e)ing or (potential) failure.
At present, in domestic and international power industry practice, generally using dissolved gas analysis method (Dissolved gas
Analysis, DGA), i.e., by analyzing the safe condition of the dissolved gas volumetric concentration in immersion oil sample to judge transformer etc.
Level.Specifically, DGA methods set the equipment safety grade of various dissolved gas volumetric concentrations by monitoring with statistical methods for experiment
Threshold value, each dissolved gas content is contrasted using upper limit principle, as long as a certain characteristic gas or total characteristic void fraction value
Between certain safe class bound threshold value, then judge that transformer equipment is in the safe class.
In International Electrotechnical Commission's IEC 60599-2007 standards, by setting two thresholds to every kind of characteristic gas in DGA
Value falls into three classes transformer safety state, i.e. normal condition, attention state and alarm condition.IEEE C57.104-
In 2008 standards, three threshold values are set respectively to every kind of characteristic gas in DGA and total characteristic gas, transformer safety state point
Into four grades, i.e. normal condition, attention state, abnormality and severe conditions, wherein latter two safe condition correspondence IEC's
Alarm condition.
From the foregoing, it will be observed that the transformer safety state evaluating method that IEC and ieee standard are provided, the threshold value of setting is too many,
Calculate complex.Accordingly, it is desirable to provide a kind of appraisal procedure of new oil chromatography transformer safety state.
The content of the invention
This application provides a kind of appraisal procedure of oil chromatography transformer safety state, commented with solving transformer safety state
During estimating, threshold value is too many, the problem of calculating complicated.
A kind of appraisal procedure of oil chromatography transformer safety state, comprises the following steps：
Step 1: the sample data of collection oil chromatography transformer, according to the sample data, determines containing for the transformer
Oxygen amount rank；
Step 2: according to the oxygen content rank of the transformer, determining the threshold value of the safe class of the transformer；
Step 3: according to the content value of associated gas in the sample data, determining that the fault energy of the transformer is strong
Degree；
Step 4: according to the threshold value and the fault energy intensity, determining that the fault energy intensity of the transformer refers to
Number；
Step 5: according to the fault energy intensity index, obtaining the safe condition grade of the transformer.
Further, it is described according to the sample data when the sample data only includes one group, determine the transformation
The oxygen content rank of device, including：The nitrogen oxygen ratio of the sample data is calculated, according to the nitrogen oxygen ratio, the transformation is determined
The oxygen content rank of device.
Further, it is described according to the sample data when the sample data includes multigroup, determine the transformer
Oxygen content rank, including：The nitrogen oxygen ratio of each group of sample data is calculated, according to the median of the nitrogen oxygen ratio, it is determined that
The oxygen content rank of the transformer.
Further, the associated gas includes methane, ethane, ethene and acetylene.
Further, the calculation formula of the fault energy intensity is：
Wherein, X1、X2、X3、X4The respectively content of methane, ethane, ethene, acetylene；
The respectively energy-absorbing weight of methane, ethane, ethene, acetylene.
Further, the content value according to associated gas in the sample data, determines the failure of the transformer
Energy intensity, including：
According to the measure temperature of gas in the transformer, the amendment fault energy intensity of transformer is determined；According to described
Threshold value and the amendment fault energy intensity, determine the fault energy intensity index of the transformer.
Further, the calculation formula of the amendment fault energy intensity is：
P '=273P/ (273+T)
Wherein, P ' is amendment fault energy intensity, and P is fault energy intensity, Fahrenheit temperature when T is eudiometry.
Further, it is described according to the threshold value and the fault energy intensity, obtain the fault energy of the transformer
Intensity index, including：
If P ＜ L1, then PI=1+P/L1；
If L1≤ P ＜ L2, then PI=2+ (P-L1)/(L2-L1)；
If L2≤ P ＜ L3, then PI=3+ (P-L2)/(L3-L2)；
If P >=L3, then PI=4.0；
Wherein, P is fault energy intensity, and PI is fault energy intensity index, L1For normal condition and the threshold of attention state
Value；L2For attention state and the threshold value of abnormality；L3The threshold value of abnormality and severe conditions.
Further, it is described according to the fault energy intensity index, obtain the safe condition grade of the transformer, bag
Include：
As PI ＜ 2.0, infer that transformer is in normal condition；
As 2.0≤PI ＜ 3.0, infer that transformer is in attention state；
As 3.0≤PI ＜ 4.0, infer that transformer is in abnormality；
When PI >=4.0, infer that transformer is in severe conditions；
Wherein, PI is fault energy intensity index.
The technical scheme that the application is provided includes following advantageous effects：
The application is on the different dissolved gas feature bases of various failures generations are analyzed, selection methane, ethane, ethene and second
Four kinds of gases of alkynes, absorb failures using them respectively and discharge the ability of heat energy as weight, four kinds of gas in calculating transformer oil sample
The fault energy intensity index of the total constituent content of body, and contrast fault energy intensity index with the threshold value of setting to infer transformer
Safe condition grade.This method needs the threshold value set few, calculates simple, and to all kinds of transformer faults particularly high energy mistake
Safe condition reaction sensitivity caused by the catastrophe failure such as heat and arc discharge is higher.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
A kind of connection block diagram of the appraisal procedure for oil chromatography transformer safety state that Fig. 1 provides for the application.
A kind of flow chart of the appraisal procedure for oil chromatography transformer safety state that Fig. 2 provides for the application.
Embodiment
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows the implementation for meeting the application
Example, and be used to together with specification to explain the principle of the application.
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, on the premise of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Embodiment 1
The present invention is that 31.5MVA, rated voltage are 110kV oil-immersed type transformers with reference to a certain rated power, and the application is carried
The appraisal procedure of the oil chromatography transformer safety state of confession is described in detail, with reference to Fig. 1 and Fig. 2, the specific steps of this method
It is as follows：
Step 1: the sample data of collection oil chromatography transformer, states data according to the sample, determines the transformer
Oxygen content rank.
The transformer has put into operation 10 months 3 years, oil chromatography experiment is carried out to the transformer oil sample, in 20 DEG C of ring
Under border, content (μ L/L) data of each dissolved gas in oil sample sheet are measured, the sample data is only one group, specifically such as the institute of table 1
Show：
The transformer oil sample data of table 1
Note：TDCG represents to dissolve fuel gas total amount.
Working group of IEEE/PES transformers committee C57.104 result of study shows, the transformer enlistment age, rated power,
The factor such as voltage class and oil storage system type all has an impact to dissolved gas content in oil medium, but wherein influence factor is most
Big effect may be characterized as the ratio of dissolved nitrogen and oxygen in Medium OilOxygen content is higher in transformer oil medium, then molten
Solve hydrocarbon concentration lower.The application uses working group of IEEE/PES transformers committee C57.104 NULL knot
Really, the nitrogen oxygen ratio dissolved in setting transformerThreshold value be 5.94, the transformer higher than the threshold value is referred to as low contain
Oxygen transformer, otherwise referred to as high oxygen-containing transformer.
For the embodiment of the present invention, the sample data according to table 1 calculates the nitrogen oxygen ratio of the sample data.Tool
Body, the nitrogen oxygen ratio of the transformerBecause the nitrogen oxygen ratio of the transformer is more than
5.94, accordingly, it is determined that the transformer is low oxygen-containing transformer.
Step 2: according to the oxygen content rank of the transformer, determining the threshold value of the safe class of the transformer.
Specifically, the solution gas in the transformer safety grade according to set by working group of the IEEE/PES transformers committee
Body content threshold value, calculating obtains following threshold value.For the transformer of high oxygen-containing class, L is set1=0.39 (kJ/kL) is transformer
Normal condition and attention state threshold value, set L2=0.72 (kJ/kL) is transformer attention state and the threshold of abnormality
Value, sets L3=1.98 (kJ/kL) are transformer exception state and the threshold value of severe conditions.For the transformer of low oxygen-containing class,
Set L1=1.02 (kJ/kL) are the normal condition of transformer and the threshold value of attention state, set L2=1.87 (kJ/kL) are change
The threshold value of depressor attention state and abnormality, sets L3=4.00 (kJ/kL) are abnormality and the threshold value of severe conditions.
For the embodiment of the present invention, because the transformer is low oxygen-containing transformer, therefore, L is set1=1.02 (kJ/kL)
The threshold value of normal condition and attention state for the transformer, sets L2=1.87 (kJ/kL) be the transformer attention state and
The threshold value of abnormality, sets L3=4.00 (kJ/kL) are the transformer exception state and the threshold value of severe conditions.
Step 3: according to the content value of associated gas in the sample data, determining that the fault energy of the transformer is strong
Degree；
Under normal circumstances, the gas dissolved in transformer oil includes H2、CH4、C2H6、C2H4、C2H2、CO、TDCG、N2、O2Deng
Multiple gases.In main dissolved gas, general H2More than the 72% of dissolved gas is accounted for CO contents, but their generation is very
It is not caused by transformer fault, it is difficult to quantitatively distinguish the H as caused by non-faulting reason in the case of many2With CO accountings.In addition, H2
Because molecule is small, during transformer station high-voltage side bus and oil chromatography sampling when easily from oil medium and oil sample escape and cause miss
Difference.And according to thermo-dynamic principle, methane, ethane, ethene and acetylene are mainly caused by transformer fault, their materialization is special
Property determine that these dissolved gas content accountings that different failures are generated are different.Therefore, methane, second selected by the application
Alkane, ethene and acetylene are used as the associated gas for assessing transformer safety state estimation.
Transformer nearby can form specific energy and Temperature Distribution by oil immersion environment when breaking down, so as to cause to become
Depressor immersion oil decomposes cracking, and the hydrocarbons such as methane, ethane, ethene and acetylene are ultimately generated by complicated chemical reaction.
The transformer size that breaks down can show as intensity and the duration of its caused energy and Temperature Distribution.And fault energy
The content of methane in oil medium, ethane, ethene and acetylene is will result in the intensity and duration difference of Temperature Distribution
It is different.The content size of these four gases is also relevant with the ability of their absorption fault energy.
The thermo-dynamic principle that the application is produced from dissolved gas, selection methane, ethane, ethene and acetylene are used as phase
Gas is closed, the quantity generated according to them is taken and come characterization failure energy using its unit dissolved gas energy absorption ability as weight
Intensity, so standardize be described as fault energy intensity index to infer transformer safety grade.
Specifically, it is raw by normal octane (n-octane) under normal temperature (273K) and normal pressure (101.325kPa)
The energy needed into 1 moles of methane gasGenerate the energy of 1 ethane gas needsGenerate the energy of 1 molar ethylene gas needsGenerate 1 mol. Acetylene gas
The energy that body needsAssuming that four kinds of dissolved gas contents are expressed as X1, X2, X3And X4, using list
Position μ L/L (ppm), then the calculation formula of fault energy intensity (P) is as follows：
For the embodiment of the present invention, by transformer dissolved gas methane (CH4), ethane (C2H6), ethene (C2H4) and acetylene
(C2H2) content value X1=97.1, X2=62.0, X3=117.8 and X4=0.3 substitutes into formula (2), draws fault energy intensity level
For：
Alternatively, if dissolved gas content is determined in the case of the 273K (0 DEG C) of standard, according to the transformation
The measure temperature of gas in device, determines the amendment fault energy intensity of transformer.
Specifically, the calculation formula of the amendment fault energy intensity is：
P '=273P/ (273+T) (4)
Wherein, P ' is amendment fault energy intensity, and P is fault energy intensity, and T is the measure Fahrenheit temperature of gas.
For the embodiment of the present invention, due to T=20 DEG C of the probe temperature of transformer oil sample, the temperature is not in standard
273K (0 DEG C), therefore, will be modified to fault energy intensity.
It is described amendment fault energy intensity level be：
Step 4: according to the threshold value and the fault energy intensity, determining that the fault energy intensity of the transformer refers to
Number is just.
Further, when the measure temperature according to gas in the transformer, determine that the amendment fault energy of transformer is strong
After degree, according to the threshold value and the amendment fault energy intensity, the fault energy intensity index of the transformer is determined.Tool
Body includes：
If P ＜ L1, then PI=1+P/L1；
If L1≤ P ＜ L2, then PI=2+ (P-L1)/(L2-L1)；
If L2≤ P ＜ L3, then PI=3+ (P-L2)/(L3-L2)；
If P >=L3, then PI=4.0；
Wherein, P is fault energy intensity, and PI is fault energy intensity index, L1For facing for normal condition and attention state
Boundary's threshold value；L2For attention state and the threshold limit value of abnormality；L3The threshold limit value of abnormality and severe conditions.
For the embodiment of the present invention, fault energy intensity is 1.07 (kJ/kL), the normal condition and attention shape of the transformer
The threshold value of state is L1=1.02 (kJ/kL)；The threshold value of the transformer attention state and abnormality is L2=1.87 (kJ/kL), should
Transformer exception state and the threshold value of severe conditions are L3=4.00 (kJ/kL).
Because fault energy intensity is by L1＜ P ＜ L2, fault energy intensity index is：
PI=2+ (P-L1)/(L2-L1)=2+ (1.07-1.02)/(1.87-1.02)=2.06 (6)
Step 5: according to the fault energy intensity index, obtaining the safe condition grade of the transformer.
Specifically, the fault energy intensity index, obtains the safe condition grade of the transformer, including：
As PI ＜ 2.0, infer that transformer is in normal condition；
As 2.0≤PI ＜ 3.0, infer that transformer is in attention state；
As 3.0≤PI ＜ 4.0, infer that transformer is in abnormality；
When PI >=4.0, infer that transformer is in severe conditions；
Wherein, PI is fault energy intensity index.
For the embodiment of the present invention, due to PI=2.06, and 2.0 ＜ PI ＜ 3.0, it could therefore be concluded that the transformer is pacified
Congruent level belongs to attention state.
Embodiment 2
The embodiment of the present invention is that 250MVA, rated voltage are 500kV with reference to a rated power, in input on June 1st, 2005
The sample data of the oil immersed power transformer of operation, the appraisal procedure to the transformer safety state of the application is carried out furtherly
It is bright.
When transformer has multiple oil chromatography sample datas, the method that the application can be used to provide calculates each sample
Fault energy intensity index, the situation of change and development trend of transformer safety state are grasped by comparative analysis, is more
Specific and deep transformer fault detection and experiment provide foundation.
During the transformer station high-voltage side bus, 4 oil chromatography experiments are carried out to it, under 0 DEG C of environment, are measured each in oil sample sheet
Content (μ L/L) data of individual dissolved gas.The sample data is multigroup, the sample data and its statistical result such as institute of table 2
Show.
The present embodiment is essentially identical to the processing method of sample data and the method that is provided in embodiment 1, its something in common
It will not repeated in this implementation, its difference is：
(1) in step one, for the embodiment of the present invention, the sample data is including multigroup, accordingly, it is determined that the transformer
Oxygen content rank, including：
Each group of sample data nitrogen oxygen ratio is calculated, according to the median of the nitrogen oxygen ratio, the transformer is determined
Oxygen content rank.Sample data according to table 2, the median of nitrogen oxygen ratioDue to the transformer
Nitrogen oxygen ratio be more than 5.94, accordingly, it is determined that the transformer be low oxygen-containing transformer.
(2) in step 3, because the dissolved gas content in the embodiment of the present invention is 273K (0 DEG C) situation in standard
Lower measure, it therefore, there is no need to be modified fault energy intensity.
The transformer oil sample data of table 2 and statistical result
Note：TDCG represents to dissolve fuel gas total amount.
Because the sample data of the transformer was gathered in the different service stages of transformer, therefore, statistics can be passed through
As a result its safe condition trend is analyzed.With reference to table 2, make a concrete analysis of as follows：
(1) sample data 1 is the sample data after the transformer puts into operation 4 years.As can be seen that the now first in transformer oil
Alkane, ethane, ethylene contents are not high.Fault energy intensity level P=0.45 now, fault energy intensity index PI=1.44,
Now the transformer safety is in normal condition.
(2) sample data 2 is the sample data after the transformer puts into operation 5 years.As can be seen that the first in the sample data 2
Alkane, ethane, ethylene contents are dramatically increased compared with sample data 1, and particularly hyperthermia and superheating failure T3 key gas ethene contains
Measure absolute value increase more notable.
Fault energy intensity level P=1.97 now, fault energy intensity index PI=3.05.Now, the transformer is in
Reveal obvious hyperthermia and superheating T3 failure symptoms, transformer safety grade enters abnormality, it is necessary to pay close attention to transformer event
Hinder risk.
(3) sample data 3 is the sample data after the transformer puts into operation 6 months 5 years.Although the sampling with sample data 2
Time is only separated by half a year, but, it is apparent that methane, ethene, acetylene content are added closely than last time sampling in sample data 3
46%.
Fault energy intensity level P=2.88 now, fault energy intensity index PI=3.47.Although transformer safety etc.
Level is still in abnormality, but hyperthermia and superheating T3 failure symptoms are more notable, show that transformer fault risk is further increased, and
And in the gesture of acceleration.
(4) sample data 3 is the sample data after the transformer puts into operation 9 months 5 years.As can be seen that in the sample data 4
Methane, ethane, ethene, acetylene content than last time sampling add 64.3%.
Fault energy intensity level P=4.86 now, fault energy intensity index PI is more than 4.0.So that transformer is pacified
Congruent level enters severe conditions.Fault energy intensity index PI shows that transformer may occur out of control, it is necessary to stop transport at once at any time.
Transformer is stopped transport after a few days, is checked and is found that high voltage side of transformer winding has occurred in that Inter-turn Short Circuit Phenomenon.
This method needs the threshold value set few, calculates simple, and to all kinds of transformer faults particularly high energy overheat and
Safe condition reaction sensitivity caused by the catastrophe failures such as arc discharge is higher.
It should be noted that term " comprising ", "comprising" or its any other variant are intended to the bag of nonexcludability
Contain, so that article or equipment including a series of key elements not only include those key elements, but also including not arranging clearly
Other key elements gone out, or also include for this process, method, article or the intrinsic key element of equipment.Not more
In the case of limitation, the key element limited by sentence "including a ...", it is not excluded that in the process including the key element, side
Also there is other identical element in method, article or equipment.
Described above is only the embodiment of the application, is made skilled artisans appreciate that or realizing this Shen
Please.A variety of modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
It should be appreciated that the application is not limited to the content being described above, and its model can not departed from
Enclose the various modifications and changes of progress.Scope of the present application is only limited by appended claim.
Claims (9)
1. a kind of appraisal procedure of oil chromatography transformer safety state, it is characterised in that including：
The sample data of oil chromatography transformer is gathered, according to the sample data, the oxygen content rank of the transformer is determined；
According to the oxygen content rank of the transformer, the threshold value of the safe class of the transformer is determined；
According to the content value of associated gas in the sample data, the fault energy intensity of the transformer is determined；
According to the threshold value and the fault energy intensity, the fault energy intensity index of the transformer is determined；
According to the fault energy intensity index, the safe condition grade of the transformer is obtained.
2. according to the method described in claim 1, it is characterised in that when the sample data only includes one group, the basis
The sample data, determines the oxygen content rank of the transformer, including：
The nitrogen oxygen ratio of the sample data is calculated, according to the nitrogen oxygen ratio, the oxygen content rank of the transformer is determined.
3. according to the method described in claim 1, it is characterised in that described according to institute when the sample data includes multigroup
Sample data is stated, the oxygen content rank of the transformer is determined, including：
The nitrogen oxygen ratio of each group of sample data is calculated, according to the median of the nitrogen oxygen ratio, containing for the transformer is determined
Oxygen amount rank.
4. according to the method described in claim 1, it is characterised in that the associated gas includes methane, ethane, ethene and second
Alkynes.
5. method according to claim 4, it is characterised in that the calculation formula of the fault energy intensity is：
Wherein, X1、X2、X3、X4The respectively content of methane, ethane, ethene, acetylene； Respectively
For methane, ethane, ethene, acetylene energy-absorbing weight.
6. according to the method described in claim 1, it is characterised in that the content according to associated gas in the sample data
Value, determines the fault energy intensity of the transformer, including：
According to the measure temperature of gas in the transformer, the amendment fault energy intensity of the transformer is determined；
According to the threshold value and the amendment fault energy intensity, the fault energy intensity index of the transformer is determined.
7. method according to claim 6, it is characterised in that the calculation formula of the amendment fault energy intensity is：
P '=273P/ (273+T)
Wherein, P ' is amendment fault energy intensity, and P is fault energy intensity, Fahrenheit temperature when T is eudiometry.
8. according to the method described in claim 1, it is characterised in that described according to the threshold value and the fault energy intensity,
The fault energy intensity index of the transformer is obtained, including：
If P ＜ L1, then PI=1+P/L1；
If L1≤ P ＜ L2, then PI=2+ (P-L1)/(L2-L1)；
If L2≤ P ＜ L3, then PI=3+ (P-L2)/(L3-L2)；
If P >=L3, then PI=4.0；
Wherein, P is fault energy intensity, and PI is fault energy intensity index, L1For normal condition and the threshold value of attention state；L2
For attention state and the threshold value of abnormality；L3The threshold value of abnormality and severe conditions.
9. according to the method described in claim 1, it is characterised in that described according to the fault energy intensity index, obtain institute
The safe condition grade of transformer is stated, including：
As PI ＜ 2.0, infer that transformer is in normal condition；
As 2.0≤PI ＜ 3.0, infer that transformer is in attention state；
As 3.0≤PI ＜ 4.0, infer that transformer is in abnormality；
When PI >=4.0, infer that transformer is in severe conditions；
Wherein, PI is fault energy intensity index.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074824A (en) * | 2023-08-17 | 2023-11-17 | 东莞市港龙电源设备有限公司 | Inspection system and method for transformer protection system |
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| CN101122523A (en) * | 2007-06-26 | 2008-02-13 | 中国铝业股份有限公司 | On-line detection method for transformer insulation oil temperature and characteristic gas in oil and oil chromatography |
| CN105445584A (en) * | 2015-11-27 | 2016-03-30 | 云南电网有限责任公司电力科学研究院 | Transformer safety state assessment method based on oil chromatography |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101122523A (en) * | 2007-06-26 | 2008-02-13 | 中国铝业股份有限公司 | On-line detection method for transformer insulation oil temperature and characteristic gas in oil and oil chromatography |
| CN105445584A (en) * | 2015-11-27 | 2016-03-30 | 云南电网有限责任公司电力科学研究院 | Transformer safety state assessment method based on oil chromatography |
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| CN117074824A (en) * | 2023-08-17 | 2023-11-17 | 东莞市港龙电源设备有限公司 | Inspection system and method for transformer protection system |
| CN117074824B (en) * | 2023-08-17 | 2024-03-22 | 东莞市港龙电源设备有限公司 | Inspection system and method for transformer protection system |
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