CN104809579B - A kind of division methods of transformer importance - Google Patents
A kind of division methods of transformer importance Download PDFInfo
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- CN104809579B CN104809579B CN201510217886.XA CN201510217886A CN104809579B CN 104809579 B CN104809579 B CN 104809579B CN 201510217886 A CN201510217886 A CN 201510217886A CN 104809579 B CN104809579 B CN 104809579B
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Abstract
The invention belongs to power equipment reliability assessment technology field, more particularly to a kind of division methods of transformer importance include the following steps：(1) each assessment parameter of input transformer group；(2) it is the first level transformer to be divided into each grade classification；(3) assessment is carried out according to transformer station high-voltage side bus external environment and is divided into the second level；(4) third level division is carried out according to the degree of concern of transformer, if carrying out three hierarchies to transformer, result still fails to divide the importance between transformer, then it is assumed that their importance is identical；(5) the at all levels of division is ranked up, and exports ranking results.The present invention provides beneficial reference for maintenance sequence, the O＆M policy development of transformer.
Description
Technical field
The invention belongs to power equipment reliability assessment technology field, more particularly to a kind of division side of transformer importance
Method.
Background technology
After power transformer breaks down, transformer will be damaged, and generate the maintenance cost of great number, be also needed to when serious
Transformer is replaced, larger economic loss is caused, meanwhile, power failure caused by failure or load down operation will cause factory
The underproduction, shut-down, city some areas traffic jam, make the normal activity of resident be affected, if it is the first type load, power-off
It will cause personal injury or politics, military affairs, heavy losses economically.
Since the model of transformer, voltage class, load type and residing power grid status are different, transformer is being purchased
Buy, replace and operation and maintenance needed for spend have differences, importance of the transformer in power grid is not quite similar, current risk
Assessment directive/guide relates generally to power equipment, and specific aim is not strong.Therefore it when formulating the operation and maintenance strategy of transformer, can not provide
More rational evaluation index, directive/guide are often made no exception, and are only ranked up only in accordance with state-detection result, some equipment are caused
Repair is exaggerated or important equipment repair in part is insufficient, is consumed a large amount of manpower and materials and is not improved maintenance efficiency yet but.Actual motion
In, if the condition evaluation results of a transformer are very poor, if but it fail consequence (on system safety operation influence) very
It is small or ignore, and the condition evaluation results of another equipment are slightly good, but there is prodigious failure effect, in limited manpower or maintenance
Under conditions of can only overhauling one under component resource, the big equipment of trouble shooting consequence first is often preferred embodiment.
Invention content
The purpose of the present invention is to solve the above problem of the prior art, provides a kind of division side of transformer importance
Method, to achieve the goals above, the technical solution adopted by the present invention are as follows：
A kind of division methods of transformer importance, it is characterised in that：Level is divided according to different transformers, with assessment
Transformer importance assesses premise and condition that a upper distinguishing hierarchy is next level, if some level has been assessed
Go out the importance of all transformers to be assessed, then without next hierarchy, division methods include the following steps：
(1) each assessment parameter of input transformer group, and give a mark to assessment parameter, the assessment parameter is mainly wrapped
Include the marking value of high voltage side of transformer voltage class, the marking value of load level, the marking value of transformer status and transformer
Concerned degree：
(2) transformer is weighted assessment according to high voltage side of transformer voltage class, load level and transformer status,
It is divided into the first level；
(3) it for the identical transformer of the first level assessment result, is assessed, is drawn according to transformer station high-voltage side bus external environment
It is divided into the second level, is run due to transformer, under different bad weather circumstances, frequency is variant, therefore proposes weighting
Average computational methods：
Expression formula 1. in, there is total item number of inferior weather, XM under the runtime environment for annual transformer in NCiFor it
In a project marking value, PiFor the frequency that may occur every year, tiFor the duration；
(4) importance for carrying out not marking off after the first level and the second distinguishing hierarchy transformer yet, further according to transformer
Concerned degree carry out third level division, if to transformer carry out three hierarchies, result still fail divide become
Importance between depressor, then it is assumed that their importance is identical；
(5) importance for marking off transformer at all levels is ranked up, and exports ranking results.
Preferably, 2. the division methods of first level carry out assignment by expression formula：
Expression formula 2. in, I1, I2And I3Respectively high voltage side of transformer voltage class, load level and transformer status are beaten
Score value, WiFor weight.
Preferably, when carrying out the first level and the second distinguishing hierarchy, 5% is less than to the assessment result of two transformers
When relative error range, it is believed that transformer is identical in the importance of the level, relative error range with cross error checking formula into
Row calculates：
Expression formula 3. in, X1For assessed value big in transformer, X2For small assessed value, η is relative error magnitudes.
Preferably, it after each assessment parameter being carried out marking assessment, carries out the first level and the second level marks off transformation
The importance of device then carries out error sequence, the error when being less than 5% relative error range to the assessment result of transformer
Sequence step includes the following steps：
(a) N platform transformers are calculated, obtained parameter calculated value is arranged simultaneously according to descending sequence
Generate set { X1, X2, X3... ..., XN-1, XN}；
(b) maximum calculated value X is selected1With second largest value X2, it brings expression formula into and 3. calculates, if error is less than 5%,
Then X1And X2Importance is identical, conversely, X1Importance is more than X2；
(c) by X1And Xi(i=3,4 ..., N) bring expression formula intoIf there is 3≤m<N makesMore than 5%, then first m-1 are same level, and importance is higher than remaining N-m+1, if m
=N and error are less than 5%, then the importance of transformer cannot be distinguished in the first level；
(d) it is further sorted to remaining N-m+1 equipment, repetition step c, but X at this time1It should become
XN-m+1, until completing all sequences.
In conclusion the utility model has the advantages that：
The beneficial effects of the present invention are：The present invention provides a kind of division methods of transformer importance, by transformer
Highest voltage level, the status of transformer, load status are as the first level, to running environment as the second distinguishing hierarchy transformation
Device importance provides beneficial reference for maintenance sequence, the O＆M policy development of transformer；Importance by transformer is it
Status assessment and risk assessment provide effective input parameter, meanwhile, to the whole-life cycle fee of transformer, scheduling unit
The operation planning of the electric system such as door proposes reference with control.
Description of the drawings
In order to illustrate more clearly of present example or technical solution in the prior art, to embodiment or will show below
Required attached drawing, which is done, in having technology to describe simply introduces, it should be apparent that, the accompanying drawings in the following description is only the present invention
Some examples to those skilled in the art, can also be attached according to these under the premise of not paying creativeness
Figure obtains other attached drawings.
Fig. 1 is a kind of systematic schematic diagram of the division methods of transformer importance of the present invention.
Fig. 2 is a kind of error checking estimation flow of the division methods of transformer importance of the present invention.
Fig. 3 is a kind of estimation flow figure of the division methods of transformer importance of the present invention.
Specific implementation mode
Below in conjunction with the attached drawing in present example, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
In conjunction with Fig. 1, a kind of division methods of transformer importance carry out division level according to different transformers, determine
Transformer importance, when assessment, a upper distinguishing hierarchy was the premise and condition of next level, if some level has been commented
Estimate the importance for all transformers to be assessed, then without next hierarchy, division methods include the following steps：
(1) the assessment parameter of each evaluation item of input transformer group, and give a mark to assessment parameter, each assessment ginseng
Number packet is mainly wanted including the assessment parameter in table one；
Table one：Each assessment parameter
| Parameter is numbered | Project |
| 1 | The marking value of high voltage side of transformer voltage class |
| 2 | The marking value of load level |
| 3 | The marking value of transformer status |
| 4 | Every marking value of transformer station high-voltage side bus environment and the environment duration |
| 5 | The concerned degree of transformer |
(2) transformer is weighted assessment according to high voltage side of transformer voltage class, load level and transformer status,
It is divided into the first level；The first distinguishing hierarchy, high side voltage grade are carried out according to transformer station high-voltage side bus highest voltage level first
Higher, load level and equipment status are higher, then the importance of transformer in systems is higher；
(3) it for the identical transformer of the first level assessment result, is assessed according to the operation external environment of transformer,
It is divided into the second level；Since transformer is run under different bad weather circumstances, frequency is variant, therefore proposes weighting
Average computational methods：
Expression formula 1. in, NC occur under the runtime environment for annual transformer inferior weather total item number (present invention
The item number of embodiment is 16) XMiFor one of which purpose marking value；PiFor the frequency (unit that may occur every year：Secondary/
Year), tiFor the duration (unit of the project：It)；
(4) importance for carrying out not marking off after the first level and the second distinguishing hierarchy transformer yet, according to transformer by
The degree of concern carries out third level division, if carrying out three hierarchies to transformer, result still fails to divide transformation
Importance between device, then it is assumed that their importance is identical；In conjunction with Fig. 1, further, if yet can not by the second level
The importance of equipment is marked off, third level division is carried out, it is required that being to be divided according to the degree of concern of transformer, such as
Whether the place of production is home or overseas, and the place of production is the concerned degree of foreign country higher than the country, the product importance height of external import
Product in the homotype country, it is however generally that, for external transformer, often quality and procurement price, maintenance price are higher than the country
For homotype with the product of voltage class, the O＆M expense and breakdown maintenance cost of transformers imported equipment are also often higher than Homemade Transformers
Equipment, therefore external imported product importance is higher than home products.
(5) importance for marking off transformer at all levels is ranked up, and exports ranking results.
In the present invention, in the division methods of the first level 2. assignment is carried out by expression formula：
Expression formula 2. in, I1, I2And I3Respectively high voltage side of transformer voltage class, load level, the marking of equipment status
It is worth, obtaining value method is determined by table two, table three and table four, WiFor weight,
Table two：The obtaining value method of transformer voltage grade
Table three：The obtaining value method of load level
Table four：The obtaining value method of transformer status
Transformer identical for the first level assessment result carries out the second level according to the external environment of transformer station high-voltage side bus
Division, the severe degree classification of transformer station high-voltage side bus external environment, weather is more severe, service condition is more unfavorable, then transformer
Importance is higher, and adverse circumstances are divided into following several classes by the present invention, and determine its severe degree by marking, and marking value is higher,
Then importance is bigger, and table five gives some harsh weather and marking.
Table five：The classification of service condition residing for transformer
In the present invention, when carrying out the first level and the second distinguishing hierarchy, the assessment result of two transformers is less than
When 5% relative error range, it is believed that transformer is identical in the importance of the level, and relative error range is public with error checking is crossed
Formula is calculated：
Expression formula 3. in, X1For assessed value big in transformer group, X2For small assessed value, η is relative error magnitudes.Error
After estimation flow by each assessment parameter as shown in Fig. 2, carry out marking assessment, carries out the first level and the second level marks off change
The importance of depressor then carries out error sequence, in error when being less than 5% relative error range to the assessment result of transformer
Maximum assessment parameter is first selected when assessment, and is classified as the 1st grade (I in table two1Value is 1), then with remaining assessment
The maximum value of value is computed repeatedly, until completing whole error checking；Specifically estimation flow (is as follows with the first level
Example)：
(a) N platform transformers are calculated, obtained parameter calculated value is arranged simultaneously according to descending sequence
Generate set { X1, X2, X3... ..., XN-1, XN}；
(b) maximum calculated value X is selected1With second largest value X2, it brings formula into and 3. calculates, if error is less than 5%,
X1And X2Importance is identical；Conversely, X1Importance is more than X2；
(c) by X1And Xi(i=3,4 ..., N) bring expression formula intoIf there is 3≤m<N makesMore than 5%, then first m-1 are same level, and importance is higher than remaining N-m+1, if m
=N and error are less than 5%, then the importance of transformer cannot be distinguished in the first level；
(d) it is further sorted to remaining N-m+1 equipment, repetition step c, but X at this time1It should become
XN-m+1；Until completing all sequences.
It is the specific implementation step of the present invention below：
There are two, the transformer of 500kV voltage class, two, 220kV transformers and 110kV transformers in certain transmission system
Three, it is as shown in Table 6 that basic importance assesses initial parameter：
Table six：Transformer importance assesses initial parameter
After the completion of basic importance assessment initial parameter assessment, then weight is carried out to 7 transformers of this implementation steps
It spends and is ranked up, sequence flow chart is as shown in figure 3, specifically sort as follows：
(1) sequence of the first level is completed；If the first level has distinguished the importance of transformer completely, tie
Beam；
After the completion of (2) first hierarchical rankings, the transformer to belonging to same level in first time level is further arranged
Sequence；If the second level has distinguished the importance of equipment completely, terminate；
(3) sequence of third level is carried out to the transformer for still failing sequence in the second level；If still cannot distinguish between
Transformer importance, then it is assumed that this group of transformer importance is identical；
First, the first distinguishing hierarchy is carried out according to transformer station high-voltage side bus highest voltage level, is 2. calculated using formula each
The assessment result of transformer is as shown in Table 7：
Table seven：First level assessment result
After carrying out error checking to the first level evaluation result respectively, I and II importance is with level-one and higher than remaining change
Depressor；It is V, VI and VII successively that III and IV same levels and importance, which are less than behind I and III, therefore importance is：Ⅰ、Ⅱ>Ⅲ、
Ⅳ>V>Ⅵ、Ⅶ。
Since the division of the first level does not mark off I and II, III and IV and VI and VII importance, to transformation
Device carries out the second distinguishing hierarchy, wherein there is following data：
Data 1：I and II belongs to same coastal area, but I Industry Development Area for being in heavy contamination, and II place ring
The preferable outskirts of a town in border；
Data 2：III is similar with IV running environment；
Data 3：VI with VII in same substation (environment is identical), master data such as eight He of table of transformer station high-voltage side bus environment
Shown in table nine；
Table eight：I and II master data：
Table nine：Two 220kV transformers (III and IV) running environment parameters：
3. using formula, I F values 13100, II F values 5325 is calculated.Prove that I service condition is more severe than II,
Therefore the importance of I is higher than II, and III is 10411, and IV is 10225, relative error 1.7%, therefore the assessment of the second level is still
The importance of two 220kV transformers cannot be divided.
Carry out third level assessment：As shown in Table 6, III is homemade goods, and IV is imported product, therefore importance IV is high
In III；And be homemade goods for VI and VII, therefore the assessment of third level cannot still distinguish its importance, both judgements weight
Spend identical, therefore final assessment result：Ⅰ>Ⅱ>Ⅳ>Ⅲ>Ⅴ>VI=VII.
The foregoing is merely the preferred embodiments of invention, are not intended to limit the invention, all spirit in the present invention
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of division methods of transformer importance, it is characterised in that：Level is divided according to different transformers, is become with assessing
Depressor importance assesses premise and condition that a upper distinguishing hierarchy is next level, if some level has evaluated
The importance of all transformers to be assessed, then without next hierarchy, division methods include the following steps：
(1) each assessment parameter of input transformer group, and give a mark to assessment parameter, the assessment parameter includes transformer
The concerned journey of the marking value of high side voltage grade, the marking value of load level, the marking value of transformer status and transformer
Degree：
(2) transformer is weighted assessment according to high voltage side of transformer voltage class, load level and transformer status, divided
For the first level；1. the division methods of first level carry out assignment by expression formula：
Expression formula 1. in, I1, I2And I3Respectively high voltage side of transformer voltage class, load level and transformer status marking value,
WiFor weight；
(3) it for the identical transformer of the first level assessment result, is assessed, is divided into according to transformer station high-voltage side bus external environment
Second level, since transformer is run under different bad weather circumstances, frequency is variant, therefore proposes average weighted
Computational methods：
Expression formula 2. in, there is total item number of inferior weather, XM under the runtime environment for annual transformer in NCiIt is wherein one
The marking value of project, PiFor the frequency that may occur every year, tiFor the duration；
(4) importance for carrying out not marking off after the first level and the second distinguishing hierarchy transformer yet, further according to transformer by
Degree of concern carries out third level division, if carrying out three hierarchies to transformer, result still fails to divide transformer
Between importance, then it is assumed that their importance is identical；
(5) importance for marking off transformer at all levels is ranked up, and exports ranking results.
2. a kind of division methods of transformer importance according to claim 1, it is characterised in that：By each assessment parameter
After carrying out marking assessment, when carrying out the first level and the second distinguishing hierarchy, two transformers are assessed respectively, when assessment is tied
When fruit is less than 5% relative error range, it is believed that transformer is identical in the importance of the level, and relative error range passes through error
Check formula is calculated：
In expression 3., X1For assessed value big in transformer group, X2For small assessed value, η is relative error magnitudes.
3. a kind of division methods of transformer importance according to claim 2, it is characterised in that：By each assessment parameter
After carrying out marking assessment, carries out the first level and the second level marks off the importance of transformer, to the assessment knot of transformer group
When fruit is less than 5% relative error range, then error sequence is carried out, the error sequence step includes the following steps：
(a) N platform transformers are calculated, obtained parameter calculated value is arranged and generated according to descending sequence
Gather { X1, X2, X3... ..., XN-1, XN}；
(b) maximum calculated value X is selected1With second largest value X2, bring expression formula into and 3. calculate, if error is less than 5%, X1
And X2Importance is identical, conversely, X1Importance is more than X2；
(c) by X1And Xi(i=3,4 ..., N) bring expression formula intoIf there is 3≤m<N makesMore than 5%, then first m-1 are same level, and importance is higher than remaining N-m+1, if m
=N and error are less than 5%, then the importance of transformer cannot be distinguished in the first level；
(d) it is further sorted to remaining N-m+1 equipment, repetition step c, but X at this time1It should become XN-m+1, directly
To all sequences of completion.
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| JP2003016374A (en) * | 2001-06-28 | 2003-01-17 | Toshiba Corp | Evaluating method and drawing-up method for power generating facility plan, and program |
| CN102621421A (en) * | 2012-03-29 | 2012-08-01 | 贵阳供电局 | Transformer state evaluation method based on correlation analysis and variable weight coefficients |
| CN103700025A (en) * | 2013-11-22 | 2014-04-02 | 浙江大学 | Power system equipment importance assessing and sorting method based on risk analysis |
| JP5556334B2 (en) * | 2010-04-23 | 2014-07-23 | 東京電力株式会社 | Power system reliability evaluation system |
| CN104112239A (en) * | 2014-07-03 | 2014-10-22 | 深圳供电局有限公司 | Transformer state evaluation method and device by using reference state analysis |
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2015
- 2015-04-30 CN CN201510217886.XA patent/CN104809579B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003016374A (en) * | 2001-06-28 | 2003-01-17 | Toshiba Corp | Evaluating method and drawing-up method for power generating facility plan, and program |
| JP5556334B2 (en) * | 2010-04-23 | 2014-07-23 | 東京電力株式会社 | Power system reliability evaluation system |
| CN102621421A (en) * | 2012-03-29 | 2012-08-01 | 贵阳供电局 | Transformer state evaluation method based on correlation analysis and variable weight coefficients |
| CN103700025A (en) * | 2013-11-22 | 2014-04-02 | 浙江大学 | Power system equipment importance assessing and sorting method based on risk analysis |
| CN104112239A (en) * | 2014-07-03 | 2014-10-22 | 深圳供电局有限公司 | Transformer state evaluation method and device by using reference state analysis |
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