CN106295216B - A kind of high-power transformer Damage by Short Circuit risk probability appraisal procedure - Google Patents
A kind of high-power transformer Damage by Short Circuit risk probability appraisal procedure Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000013139 quantization Methods 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 10
- 238000004804 winding Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 102000003712 Complement factor B Human genes 0.000 description 1
- 108090000056 Complement factor B Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
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Abstract
The invention discloses a kind of high-power transformer Damage by Short Circuit risk probability appraisal procedures, this method is by acquiring transformer device structure parameter, checking to transformer short-circuit tolerance, the factors such as the check result and transformer station high-voltage side bus environment, low-pressure side configuring condition are classified, score is set, assigns weight, situations such as in conjunction with the transformer short circuit fault information having occurred and that, quantify transformer short-circuit damage risk probability, and is classified.Staff will be seen that the damage risk of current transformer, to targetedly control measures being taken to provide technical support from now on.The present invention is applied widely, can be suitably used for the Damage by Short Circuit probability assessment of a variety of different voltages grades, different capabilities transformer.It is high reliablity of the present invention, at low cost, it can be calculated in real time with common computer, reduce the participation of staff, reduce operating error, improve work efficiency.
Description
Technical field
The present invention relates to a kind of high-power transformer Damage by Short Circuit risk probability appraisal procedures, are a kind of short suitable for transformer
The novel method of path loss bad state analysis belongs to transformer station high-voltage side bus detection and maintenance field.
Background technique
Transformer is the core of power supply system, and reliability of operation influences power system security very big.But with
The increasingly increase of current electric grid capacity, system short circuit capacity also increase with it, meanwhile, substation's access lines running environment is not allowed
Optimism, various overvoltage happen occasionally.In recent years, for various reasons, the accident that external short circuit causes high-power transformer to damage
It occurs repeatedly, many transformers are in short circuit current, short circuit duration far away from the horizontal feelings that requirements of the national standard and producer are promised to undertake
Winding deformation occurs under condition and damage, the transformer external short circuit first and second that some newly puts into operation are damaged.Therefore,
Understand whether transformer anti-short circuit capability meets live service requirement by calculating, is that current run unit is badly in need of the feelings grasped
Condition.
The short-circuit force F being able to bear with transformer itselfBIt can produce the maximum on winding when with transformer external short circuit
Short-circuit force FCRatio characterize the anti-short circuit capability of transformer, referred to as transformer short-circuit tolerance Z.The value shows more greatly
Transformer winding after by external short circuit a possibility that damaging that deform is smaller, conversely, the smaller transformer short-circuit damage of the value
Bad a possibility that, is also bigger.The method of Japanese transformer committee proposed algorithm calculating transformer short circuit tolerance Z is as follows.
Short-circuit tolerance Z is obtained by formula (1)：
F in formula (1)CIt is obtained by formula (2),
In formula (2)：lmFor the average perimeter of coil, mm；M is line cake number；FrThe electric power that interior loop is born when for short circuit,
g；
F in formula (2)rIt is obtained by formula (3)；
In formula (3)：N is the number of turns of coil；H is the height of coil, mm；K is coefficient, depend on short-circuit impedance in reactance with
The ratio of resistance can look into GB1094.5-2008 and obtain；InFor rated current, A；ukFor system impedance, %；lmFor being averaged for coil
Perimeter, mm.
F in formula (1)BIt is obtained by formula (4),
In formula (4)：E is the elasticity modulus of copper conductor, and common soft copper conducting wire usually takes E=12.25 × 104MPa；R is line
The mean radius of circle, mm, by formulaIt obtains；
In formula (4)：M is effective support number of internal coil diameter stay, is the half of practical stay number, by formula?
It arrives, wherein ZkFor practical stay number；
1. the conducting wire the moment of inertia I in formula (4) is obtained by formula (5) for plain conductor：
In formula (5)：Nb is conducting wire radical radial in line cake；B is the radial width of solid conductor, mm；nlFor in line cake
Axial conducting wire radical；T is the axial height of solid conductor, mm；The empirical coefficient of y bond state between strands, usual 1≤y
≤ 3, for plain conductor y=1；
2. the conducting wire the moment of inertia I in formula (4) is obtained by formula (6) for transposed conductor：
In formula (6)：X is the number of share of stock of a transposed conductor inside conductor；B is the radial width of per share conducting wire, mm；T is per share
The axial height of conducting wire, mm；N is the radical of transposed conductor in line cake；The empirical coefficient of y bond state between strands, usual l≤
Y≤3 apply thermosetting cement, y=1.4 for tack transposed conductor y=2.3~2.5, such as outer layer of conducting wire turn insulation.
Current each net provincial company is calculated in fortune transformer short-circuit tolerance, and some is using Japanese transformer
The algorithm that the committee is recommended, some is using finite element method calculating etc., and by these algorithms, run unit can be grasped intuitively
The short-circuit tolerance of transformer, some have also carried out statistical to the step down side equipment quality and fault condition of operation
Analysis to understand the probability of transformer low voltage side outlet tripping, and then intuitively analyzes the damage of transformer low voltage winding short circuit
Possibility, but the operating condition phase for being subjected to the short-circuit tolerance of transformer with transformer station high-voltage side bus environment and history is not yet found at present
In conjunction with, and then transformer is evaluated by the method for transformer probability of damage when short circuit.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of applied widely, high reliablity, at low cost, and under operation
Can visual assessment transformer by Damage by Short Circuit risk probability appraisal procedure.
For the transformer of operation has been put into, Damage by Short Circuit potential risk by many factors collective effect, not only with
Its short-circuit tolerance is related, also related with its operating condition, low-pressure side configuring condition etc..It is potential to influence transformer short-circuit damage
The principal element of risk is as follows.
(1) transformer short-circuit tolerance：Transformer short-circuit tolerance is that influence transformer winding Damage by Short Circuit is potential
The most important factor of risk, is determined by the structural parameters of transformer, and Japanese transformer committee proposed algorithm can be used and calculate change
Depressor short circuit tolerance Z carries out stepping according to following rules；
First grade：Z≤1.2, short-circuit tolerance is lower than 2.0, and from the point of view of anti-short circuit capability, anti-short circuit capability is seriously not
Foot；Second gear：1.2 Z≤1.7 <, anti-short circuit capability is also insufficient；Third gear：1.7 Z≤2.1 <, anti-short circuit capability are in
Meet the edge of anti-short circuit capability；Fourth speed：Between 2.1 Z≤10 <, anti-short circuit capability satisfaction from the point of view of check result resists short
Road Capability Requirement；Fifth speed：Z > 10, anti-short circuit capability greatly improves.
(2) Transformer Operation Status：It is influenced by cumulative effect, more by the transformer of short-circuit current rush once
It is easy to happen sudden short circuit damage failure, so being considered as size and number of the transformer by short-circuit current rush, Yi Jibian
The factors such as deformation of transformer winding test result.
(3) step down side configuring condition：Low-voltage side outlet quantity is more, and transformer is exported or near region short circuit
Probability it is higher, so be considered as its low-voltage side outlet quantity, whether current-limiting reactor is installed and low-pressure side bus insulation
The anti-executive condition factor of arranging such as situation is improved in change.
The present invention provides a kind of high-power transformer Damage by Short Circuit risk probability appraisal procedure, and particular content is：According to table 1
By transformer short-circuit tolerance check result, Transformer Operation Status and step down side configuring condition be arranged score,
Weight is assigned, quantifies transformer short-circuit damage risk probability F, and be classified.Formula (7) is transformer short-circuit damage risk probability
The calculation formula of F：
F=A1 × 0.6+ (B1+B2+B3+B4+B5) × 0.2+ (C1+C2+C3) × 0.2 (7)
It is 5 ranks by transformer short-circuit probability of damage F points according to the calculated result of formula (7)：First level, F >=80,
Transformer short-circuit damage risk is low；Second level, 70≤F < 80, transformer short-circuit damage risk are lower；Third level, 55≤F
< 70, transformer face certain Damage by Short Circuit risk, should take the precautionary measures；Fourth level, 35≤F < 55, transformer is short
Road damage risk is higher, should take comprehensive control measures；Fifth level, F < 35 divide, and transformer short-circuit damage risk is high.
1 transformer short-circuit damage risk factor score of table and weight
Beneficial effects of the present invention：(1) transformer short-circuit tolerance, operating condition and low-pressure side are configured feelings by the present invention
Condition is combined, and system comprehensively has rated the Damage by Short Circuit risk probability of the transformer of operation, and it is anti-to solve current transformer
Short-circuit capacity evaluation is not comprehensive, not the problem of system；
(2) running environment, the short-circuit parameters such as number and outlet short circuit are comprehensively considered in the present invention, it can in real time dynamically
Transformer short-circuit damage risk is assessed；
(3) present invention is applied widely, can Damage by Short Circuit risk probability to various various forms of high-power transformers into
Row evaluation, this method will affect transformer short-circuit damage a possibility that factor all take into account, so its can be suitably used for it is more
The Damage by Short Circuit probability assessment of kind different voltages grade transformer；
(4) high reliablity of the present invention, at low cost, can be calculated in real time with common computer, reduce hardware investment
Cost；The participation for reducing staff improves work efficiency and reduces personnel and participates in bring operating error, and improving can
By property.
Specific embodiment
Below by taking the main transformer Damage by Short Circuit evaluation in a certain case as an example, the present invention is made further details of
Explanation.
Hengshui 2 produces for main transformer 2001, transformer capacity 180MVA, voltage rating 220/110/
38.5kV。
Transformer short-circuit tolerance Z, the method according to the invention are checked according to Japanese transformer committee proposed algorithm
Obtain the score of each factor quantity of state.
Factor A：Transformer short-circuit tolerance Z=1.13 is obtained according to Japanese transformer committee algorithm, is first grade,
A1 score 20.
Factor B：It is counted to have been subjected to once more than 70% short-circuit current rush, B1 score 30；Short-circuit impedance, around
It organizes capacitance and frequency response test shows and is unsatisfactory for requiring, B2, B3, B4 score are 0；Oil chromatogram analysis is unqualified, B5 score
0。
Factor C：One outlet of step down side, C1 score 10；Current-limiting reactor, C2 score 0 are not installed；It has insulated
Change, but still there are weak spot, C3 scores 20.
Then, by formula (7) calculating transformer Damage by Short Circuit risk probability F：
F=A1 × 0.6+ (B1+B2+B3+B4+B5) × 0.2+ (C1+C2+C3) × 0.2
=20 × 0.6+30 × 0.2+ (10+20) × 0.2
=12+6+6
=24
From the point of view of judgment principle, transformer short-circuit probability of damage F is lower than 35, belongs to fifth level, i.e. transformer short-circuit
Damage risk is high.Final result shows：It is damaged after transformer short circuit.
Claims (2)
1. a kind of high-power transformer Damage by Short Circuit risk probability appraisal procedure, it is characterised in that：By transformer short-circuit tolerance
Check result, Transformer Operation Status and step down side configuring condition setting score assign weight, and quantization transformer is short
The bad risk probability F of path loss, and be classified；
It comprises the steps of,
(I) quantify transformer short-circuit damage risk probability F
Transformer short-circuit tolerance check result, Transformer Operation Status and step down side are configured into feelings according to table 1
Condition is arranged score, assigns weight, establishes transformer short-circuit damage risk probability F calculating formula (7)；
F=A1 × 0.6+ (B1+B2+B3+B4+B5) × 0.2+ (C1+C2+C3) × 0.2 (7)
Transformer short-circuit tolerance Z is checked according to Japanese transformer committee proposed algorithm, determines A1's according to the value stepping of Z
Score；
1 transformer short-circuit damage risk factor score of table and weight
(II) obtained transformer short-circuit damage risk probability F is classified
First level, F >=80；Second level, 70≤F < 80；Third level, 55≤F < 70；Fourth level, 35≤F < 55；
Fifth level, F < 35.
2. appraisal procedure according to claim 1, which is characterized in that the transformer short-circuit that will be obtained according to following rules is resistance to
Stepping is carried out by ability Z：
First grade：Z≤1.2；Second gear：1.2 Z≤1.7 <；Third gear：1.7 Z≤2.1 <；Fourth speed：2.1 Z≤10 < it
Between；Fifth speed：Z > 10.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205611A (en) * | 2018-02-07 | 2018-06-26 | 海南电网有限责任公司电力科学研究院 | With reference to transformer methods of risk assessment, device, equipment and the medium of latent fault |
| CN109581134A (en) * | 2019-01-31 | 2019-04-05 | 贵州电网有限责任公司 | One kind is in fortune power transformer anti-short circuit capability comprehensive estimation method |
| CN111898288A (en) * | 2020-05-20 | 2020-11-06 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding damage risk assessment method |
| CN117406048B (en) * | 2023-12-15 | 2024-02-27 | 国网山西省电力公司太原供电公司 | Transformer discharge fault diagnosis method and device |
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