CN106546853B - A kind of the check defence method and device of short-circuit of power transformer cumulative effect - Google Patents
A kind of the check defence method and device of short-circuit of power transformer cumulative effect Download PDFInfo
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- CN106546853B CN106546853B CN201610953984.4A CN201610953984A CN106546853B CN 106546853 B CN106546853 B CN 106546853B CN 201610953984 A CN201610953984 A CN 201610953984A CN 106546853 B CN106546853 B CN 106546853B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The check defence method and device of a kind of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention, how solve can reflect that equipment itself is resistant to cumulative effect anti-short circuit capability difference, again can with the equipment accumulation short circuit calculation and check method that repeatedly short circuit be associated in operation of power networks life cycle, the technical issues of to meet the work requirements such as equipment dependability prediction, life prediction.The method comprise the steps that according to predetermined power transformer, repeatedly the short circuit current tolerance value of short-circuit cumulative effect current value and preset national regulations number carries out result comparison, determines cumulative effect coefficient；The short-circuit current value that can be born according to cumulative effect coefficient and preset Electromagnetic Simulation mode computation；According to cumulative effect coefficient and possible short-circuit number, the short circuit current ability of transformer defence cumulative effect is determined.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of check defenders of short-circuit of power transformer cumulative effect
Method and device.
Background technique
With the fast development of power grid construction, transformer individual capacity and transmission system capacity of short circuit are constantly increasing, this
If bringing bigger risk short-circuit electromotive force to the safe operation of transformer has been more than the power that transformer winding can bear,
Buckling deformation will be generated, leads to its insulation damages, it is serious or even transformer is burnt into recent years, due to various reasons, outside
The accident that portion's short circuit causes transformer to burn occurs repeatedly, and counts at the trend risen year by year according to power department, because short circuit is made
At Accident of Transformer platform account for the 23.6%. of same period accident head station time therefore, the anti-short circuit capability for improving transformer is especially
The mechanical strength of transformer winding is extremely urgent.According to the understanding to operating status before transformer short-circuit, transformer is because of short circuit
It is damaged caused by mechanical force, is not largely system short-circuit one or two times with regard to vitiable, the cumulative effect of transformer short-circuit power
Be very important factor therefore, the case where causing deformation of transformer winding to the cumulative effect of short-circuit mechanical force, carries out effective
Check, analysis be essential.
In addition to being verified by the sudden short circuit of national regulations GB1094.5 power transformer, at present still lack compared with
Check method is evaluated for cumulative effect anti-short circuit capability that is perfect and being widely recognized, and the verification method of short-circuit test exists
There are many drawbacks for economy, safety, power failure period etc..Therefore, urgently to be resolved at present how to reflect equipment sheet
Body is resistant to cumulative effect anti-short circuit capability difference, and the equipment that can be associated with short circuit multiple in operation of power networks life cycle
Short-circuit calculation and check method is accumulated, the technical issues of to meet the work requirements such as equipment dependability prediction, life prediction.
Summary of the invention
The check defence method and device of a kind of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention solve
There is a monocycle rectangular window method for fast measuring specifically for the method for impact load electrical parameters measurement at present, using the monocycle
Electric energy fast algorithm, the caused skill that can not accurately calculate fundamental wave or voltage, electric current and active power numerical value in harmonic wave frequency range
Art problem.
A kind of check defence method of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention, comprising:
According to the short of predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national regulations number
Road electric current tolerance value carries out result comparison, determines cumulative effect coefficient；
The short-circuit current value that can be born according to the cumulative effect coefficient and preset Electromagnetic Simulation mode computation；
According to the cumulative effect coefficient and possible short-circuit number, the short circuit current of transformer defence cumulative effect is determined
Ability.
Optionally, according to the cumulative effect coefficient and possible short-circuit number, transformer defence cumulative effect is determined
After short circuit current ability further include:
According to the short-circuit number of the cumulative effect coefficient and the multiple short circuit of the predetermined power transformer, determine
The short circuit current ability of transformer defence cumulative effect.
Optionally, according to predetermined power transformer, repeatedly short-circuit cumulative effect current value and preset national regulations are secondary
Several short circuit current tolerance value carries out result comparison, before determining cumulative effect coefficient further include:
The accumulative operation of multiple short circuit based on maximum short circuit current 60-70% is carried out to the power transformer, determines institute
State cumulative effect current value.
Optionally, the cumulative effect coefficient isWherein, I is single short-circuit current value,
Imax is tolerable short-circuit current value, and n is short circuit current number.
Optionally, as short circuit current < 0.8pu, then disregard the short-circuit number.
It optionally, is then cumulative effect critical value when the cumulative effect coefficient is greater than 4.5
Optionally, the accumulative operation of multiple short circuit based on maximum short circuit current 60-70% is carried out to the power transformer,
Determine that the cumulative effect current value specifically includes:
The accumulative operation of multiple short circuit based on maximum short circuit current 60-70% is carried out to the power transformer；
When the multiple short circuit adds up operation, according to pre-set criteria short-circuit mode and stream mode is reduced with impedance rate of change
Based on judge the accumulative operation of multiple short circuit whether by short-circuit test, if so, determining the cumulative effect current value.
A kind of check defence installation of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention, comprising:
First determination unit, for according to the multiple short-circuit cumulative effect current value and preset of predetermined power transformer
The short circuit current tolerance value of national regulations number carries out result comparison, determines cumulative effect coefficient；
Computing unit, the short circuit electricity for that can be born according to the cumulative effect coefficient and preset Electromagnetic Simulation mode computation
Flow valuve；
Second determination unit, for determining that transformer is defendd according to the cumulative effect coefficient and possible short-circuit number
The short circuit current ability of cumulative effect.
Optionally, the check defence installation of short-circuit of power transformer cumulative effect further include:
The repeatedly accumulative operating unit of short circuit, for carrying out the power transformer based on maximum short circuit current 60-70%
The accumulative operation of multiple short circuit, determine the cumulative effect current value.
Third determination unit, for repeatedly short according to the cumulative effect coefficient and the predetermined power transformer
The short-circuit number on road determines the short circuit current ability of transformer defence cumulative effect.
Optionally, repeatedly the accumulative operating unit of short circuit specifically includes:
The repeatedly accumulative operation subelement of short circuit, for carrying out the power transformer based on maximum short circuit current 60-
The 70% accumulative operation of multiple short circuit；
Judge to determine subelement, be used for when the multiple short circuit adds up operation, according to pre-set criteria short-circuit mode and drop
Low stream mode judges the accumulative operation of multiple short circuit whether by short-circuit test, if so, really based on impedance rate of change
The fixed cumulative effect current value.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The check defence method and device of a kind of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention, method
It include: the short circuit electricity according to predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national regulations number
It flows tolerance value and carries out result comparison, determine cumulative effect coefficient；According to cumulative effect coefficient and preset Electromagnetic Simulation mode computation
The short-circuit current value that can be born；According to cumulative effect coefficient and possible short-circuit number, transformer defence cumulative effect is determined
Short circuit current ability.In the present embodiment, by according to predetermined power transformer repeatedly short-circuit cumulative effect current value and
The short circuit current tolerance value of preset national regulations number carries out result comparison, cumulative effect coefficient is determined, according to cumulative effect system
The short-circuit current values that several and preset Electromagnetic Simulation mode computation can be born, according to cumulative effect coefficient and possible short-circuit number,
The short circuit current ability for determining transformer defence cumulative effect, how solve can reflect that equipment itself is resistant to cumulative effect and resists
Short-circuit capacity difference, and short-circuit calculation and check can be accumulated with the equipment that repeatedly short circuit is associated in operation of power networks life cycle
Method, the technical issues of to meet the work requirements such as equipment dependability prediction, life prediction.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of one reality of check defence method of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention
Apply the flow diagram of example；
Fig. 2 is a kind of one reality of check defence installation of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention
Apply the structural schematic diagram of example；
Fig. 3 is the application examples schematic diagram of Fig. 2.
Specific embodiment
The check defence method and device of a kind of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention solve
How can reflect that equipment itself is resistant to cumulative effect anti-short circuit capability difference, but can in operation of power networks life cycle repeatedly
The equipment that short circuit is associated accumulates short-circuit calculation and check method, to meet the work such as equipment dependability prediction, life prediction
The technical issues of demand.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, a kind of check defence method of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention
One embodiment includes:
101, the accumulative operation of multiple short circuit based on maximum short circuit current 60-70% is carried out to power transformer, determined tired
Product effects current value；
When needing the check of short-circuit of power transformer cumulative effect to defend, it is necessary first to be based on to power transformer
The accumulative operation of multiple short circuit of maximum short circuit current 60-70%, determines cumulative effect current value.
102, according to predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national regulations number
Short circuit current tolerance value carry out result comparison, determine cumulative effect coefficient；
When carrying out the accumulative operation of multiple short circuit based on maximum short circuit current 60-70% to power transformer, accumulation is determined
After effects current value, need according to predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national standard rule
The short circuit current tolerance value for determining number carries out result comparison, determines cumulative effect coefficient.
103, the short-circuit current value that can be born according to cumulative effect coefficient and preset Electromagnetic Simulation mode computation；
When according to predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national regulations number
Short circuit current tolerance value carries out result comparison, after determining cumulative effect coefficient, needs according to cumulative effect coefficient and preset electricity
Magnetic simulation model calculates the short-circuit current value that can be born.
104, according to cumulative effect coefficient and possible short-circuit number, the short circuit current of transformer defence cumulative effect is determined
Ability；
After the short-circuit current value that can be born according to cumulative effect coefficient and preset Electromagnetic Simulation mode computation, root is needed
According to cumulative effect coefficient and possible short-circuit number, the short circuit current ability of transformer defence cumulative effect is determined.
105, according to the short-circuit number of cumulative effect coefficient and the multiple short circuit of predetermined power transformer, transformation is determined
The short circuit current ability of device defence cumulative effect.
When determining the short circuit current energy of transformer defence cumulative effect according to cumulative effect coefficient and possible short-circuit number
After power, need to determine transformation according to the short-circuit number of cumulative effect coefficient and the multiple short circuit of predetermined power transformer
The short circuit current ability of device defence cumulative effect.
In the present embodiment, cumulative effect coefficient isWherein, I is single short-circuit current value,
Imax is tolerable short-circuit current value, and n is that short circuit current number then disregards short-circuit number as short circuit current < 0.8pu, when tired
It is then cumulative effect critical value when product effect coefficient is greater than 4.5.
It is described below with a concrete application scene, as shown in figure 3, application examples includes: according to national standard GB1094.5 electricity
Power transformer bears short-circuit capacity, provides every phase study number 3 times in testing standard, tests by 100% short-circuit current value, at present
All short-circuit tests are carried out by this standard.Engineering practice is in the entire transformer life period, and short-circuit number may
More than 3 times, short circuit current but not necessarily reaches 100% every time, and transformer can bear how much current how many times, can also be by grinding
The short-circuit test of the reduction electric current for the property studied carefully is verified, and the multiple accumulation test for reducing electric current can refer to the meter of GB1094.5 annex
Calculation method estimated in advance, the maximum short circuit current that determination can be born, then is opened by that can bear maximum short circuit current 60-70%
Beginning short circuit accumulation test.
Standard short-circuit test method and the test method for reducing stream, two kinds of tests are all by GB1094.5 standard
4.2.7 the judgement of fault detection and test result judges whether jointly using impedance rate of change as the test of foundation and other retrials
Pass through short-circuit test.
The short-circuit test of standard and the multiple accumulation short-circuit test for reducing short circuit current should all obtain model electricity as far as possible
The tolerance short circuit current critical value of power transformer and repeatedly the tolerance current critical value of accumulation short-circuit test.This is a kind of using real
The method that survey mode obtains cumulative effect coefficient.
According to front power transformer, repeatedly the short circuit current of short-circuit cumulative effect current value and national regulations number is resistant to
Value carries out result comparison, determines cumulative effect coefficient, cumulative effect coefficientIn formula: I- single
Short-circuit current value, Imax- can tolerate short-circuit current value；N- short circuit current number.As short circuit current < 0.8pu, not metering number.
The short-circuit current value being able to bear is calculated according to cumulative effect coefficient and electromagnetic simulation software, checks the model transformation
The multiple accumulation short-circuit current value that device is able to bear, according to test experience, as k > 4.5, it is believed that be cumulative effect critical value.
According to cumulative effect coefficient and possible short-circuit number, the short circuit current energy of transformer defence cumulative effect is determined
Power.
In the present embodiment, by according to predetermined power transformer repeatedly short-circuit cumulative effect current value and preset state
The short circuit current tolerance value for marking stipulated number carries out result comparison, determines cumulative effect coefficient, according to cumulative effect coefficient and in advance
The short-circuit current value that Electromagnetic Simulation mode computation can be born is set, according to cumulative effect coefficient and possible short-circuit number, determines and becomes
Depressor defends the short circuit current ability of cumulative effect, and how solve can reflect that equipment itself is resistant to cumulative effect resistance to shorting energy
Power difference, and short-circuit calculation and check method can be accumulated with the equipment that repeatedly short circuit is associated in operation of power networks life cycle,
Come the technical issues of meeting the work requirements such as equipment dependability prediction, life prediction.
Referring to Fig. 2, a kind of check defence installation of short-circuit of power transformer cumulative effect provided in an embodiment of the present invention
Embodiment include:
The repeatedly accumulative operating unit 201 of short circuit, for carrying out power transformer based on maximum short circuit current 60-70%'s
The repeatedly accumulative operation of short circuit, determines cumulative effect current value.
Repeatedly the accumulative operating unit 201 of short circuit specifically includes:
The repeatedly accumulative operation subelement 2011 of short circuit, for carrying out power transformer based on maximum short circuit current 60-
The 70% accumulative operation of multiple short circuit；
Judge to determine subelement 2012, be used in the accumulative operation of multiple short circuit, according to pre-set criteria short-circuit mode and drop
Low stream mode judges the accumulative operation of repeatedly short circuit whether by short-circuit test, if so, determining tired based on impedance rate of change
Product effects current value.
First determination unit 202, for according to predetermined power transformer repeatedly short-circuit cumulative effect current value and
The short circuit current tolerance value of preset national regulations number carries out result comparison, determines cumulative effect coefficient；
Computing unit 203, the short circuit electricity for that can be born according to cumulative effect coefficient and preset Electromagnetic Simulation mode computation
Flow valuve；
Second determination unit 204, for determining that transformer defence is tired according to cumulative effect coefficient and possible short-circuit number
The short circuit current ability of product effect.
Third determination unit 205, for according to the repeatedly short circuit of cumulative effect coefficient and predetermined power transformer
Short-circuit number determines the short circuit current ability of transformer defence cumulative effect.
In the present embodiment, by the first determination unit 202, according to predetermined power transformer, repeatedly short circuit accumulation is imitated
It answers the short circuit current tolerance value of current value and preset national regulations number to carry out result comparison, determines cumulative effect coefficient, calculate
The short-circuit current value that unit 203 can be born according to cumulative effect coefficient and preset Electromagnetic Simulation mode computation, the second determination unit
204, according to cumulative effect coefficient and possible short-circuit number, determine the short circuit current ability of transformer defence cumulative effect, solve
How can reflect that equipment itself is resistant to cumulative effect anti-short circuit capability difference, but can in operation of power networks life cycle repeatedly
The equipment that short circuit is associated accumulates short-circuit calculation and check method, to meet the work such as equipment dependability prediction, life prediction
The technical issues of demand.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of check defence method of short-circuit of power transformer cumulative effect characterized by comprising
According to the short circuit electricity of predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national regulations number
It flows tolerance value and carries out result comparison, determine cumulative effect coefficient；
According to the short-circuit current value that the cumulative effect coefficient and preset Electromagnetic Simulation mode computation can be born, the transformation is checked
The multiple accumulation short-circuit current value that device is able to bear；
According to the cumulative effect coefficient and possible short-circuit number, the short circuit current energy of transformer defence cumulative effect is determined
Power.
2. the check defence method of short-circuit of power transformer cumulative effect according to claim 1, which is characterized in that according to
The cumulative effect coefficient and possible short-circuit number determine that the short circuit current ability of transformer defence cumulative effect is also wrapped later
It includes:
According to the short-circuit number of the cumulative effect coefficient and the multiple short circuit of the predetermined power transformer, transformation is determined
The short circuit current ability of device defence cumulative effect.
3. the check defence method of short-circuit of power transformer cumulative effect according to claim 2, which is characterized in that according to
The short circuit current tolerance value of predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national regulations number
Result comparison is carried out, before determining cumulative effect coefficient further include:
The accumulative operation of multiple short circuit based on maximum short circuit current 60-70% is carried out to the power transformer, determines the accumulation
Effects current value.
4. the check defence method of short-circuit of power transformer cumulative effect according to claim 3, which is characterized in that described
Cumulative effect coefficient is, wherein I is single short-circuit current value, and Imax is short circuit current tolerance value, n
For short-circuit number.
5. the check defence method of short-circuit of power transformer cumulative effect according to claim 4, which is characterized in that when short
When road electric current < 0.8pu, then the short-circuit number is disregarded.
6. the check defence method of short-circuit of power transformer cumulative effect according to claim 5, which is characterized in that work as institute
It is then cumulative effect critical value when stating cumulative effect coefficient as greater than 4.5.
7. the check defence method of short-circuit of power transformer cumulative effect according to claim 6, which is characterized in that institute
It states power transformer and carries out the accumulative operation of multiple short circuit based on maximum short circuit current 60-70%, determine the cumulative effect electric current
Value specifically includes:
The accumulative operation of multiple short circuit based on maximum short circuit current 60-70% is carried out to the power transformer；
When the multiple short circuit adds up operation, according to pre-set criteria short-circuit mode and stream mode is reduced using impedance rate of change as base
Plinth judges the accumulative operation of multiple short circuit whether by short-circuit test, if so, determining the cumulative effect current value.
8. a kind of check defence installation of short-circuit of power transformer cumulative effect characterized by comprising
First determination unit, for according to predetermined power transformer repeatedly short-circuit cumulative effect current value and preset national standard
The short circuit current tolerance value of stipulated number carries out result comparison, determines cumulative effect coefficient；
Computing unit, the short circuit current for that can be born according to the cumulative effect coefficient and preset Electromagnetic Simulation mode computation
Value, checks the multiple accumulation short-circuit current value that the transformer is able to bear；
Second determination unit, for determining transformer defence accumulation according to the cumulative effect coefficient and possible short-circuit number
The short circuit current ability of effect.
9. the check defence installation of short-circuit of power transformer cumulative effect according to claim 8, which is characterized in that electric power
The check defence installation of transformer short-circuit cumulative effect further include:
The repeatedly accumulative operating unit of short circuit, for carrying out the power transformer based on the multiple of maximum short circuit current 60-70%
The accumulative operation of short circuit, determines the cumulative effect current value；
Third determination unit, for according to the repeatedly short circuit of the cumulative effect coefficient and the predetermined power transformer
Short-circuit number determines the short circuit current ability of transformer defence cumulative effect.
10. the check defence installation of short-circuit of power transformer cumulative effect according to claim 9, which is characterized in that more
The secondary accumulative operating unit of short circuit specifically includes:
The repeatedly accumulative operation subelement of short circuit, for carrying out the power transformer based on the more of maximum short circuit current 60-70%
The secondary accumulative operation of short circuit；
Judge to determine subelement, for according to pre-set criteria short-circuit mode and reducing stream in the multiple short-circuit accumulative operation
Mode judges the accumulative operation of multiple short circuit whether by short-circuit test, if so, determining institute based on impedance rate of change
State cumulative effect current value.
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| CN107192917B (en) * | 2017-05-25 | 2019-11-29 | 云南电网有限责任公司电力科学研究院 | The anti-short circuit capability experimental method and system of a kind of transformer under cumulative effect |
| CN107194087A (en) * | 2017-05-26 | 2017-09-22 | 云南电网有限责任公司电力科学研究院 | A kind of appraisal procedure in fortune transformer anti-short circuit capability |
| CN107622150B (en) * | 2017-08-30 | 2020-03-31 | 西安交通大学 | Transformer short-circuit resistance assessment method based on winding deformation state diagnosis |
| CN110824383B (en) * | 2019-11-07 | 2022-01-18 | 国网天津市电力公司 | Method for calculating short circuit impact cumulative effect of transformer |
| CN110988525B (en) * | 2019-11-19 | 2022-06-10 | 国网河北省电力有限公司电力科学研究院 | Method for evaluating impact of repeated short circuit on power transformer in short time |
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| CN103267921A (en) * | 2013-05-14 | 2013-08-28 | 国家电网公司 | Method for verifying anti-short-circuit capacity of transformer |
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| CN104978482A (en) * | 2015-06-04 | 2015-10-14 | 国家电网公司 | Fault cumulative effect assessment method for PSD-BPA-based batch processing transformer |
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| JP3951931B2 (en) * | 2003-02-10 | 2007-08-01 | 松下電器産業株式会社 | Welding control method and consumable electrode type pulse arc welding apparatus |
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| CN103267921A (en) * | 2013-05-14 | 2013-08-28 | 国家电网公司 | Method for verifying anti-short-circuit capacity of transformer |
| CN104111393A (en) * | 2014-07-16 | 2014-10-22 | 云南电力试验研究院（集团）有限公司电力研究院 | Comprehensive evaluation analysis method for power transformer short-circuiting resistance |
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Effective date of registration: 20210219 Address after: No. 757, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong 510080 Patentee after: GUANGDONG POWER GRID Co. Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Patentee after: TBEA Hengyang Transformers Co.,Ltd. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Patentee before: TBEA Hengyang Transformers Co.,Ltd. |