CN109073701A - Transformer does not dismantle Method of Vibration Diagnosis - Google Patents
Transformer does not dismantle Method of Vibration Diagnosis Download PDFInfo
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- CN109073701A CN109073701A CN201780024049.2A CN201780024049A CN109073701A CN 109073701 A CN109073701 A CN 109073701A CN 201780024049 A CN201780024049 A CN 201780024049A CN 109073701 A CN109073701 A CN 109073701A
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- transformer
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- winding
- spectral density
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The present invention relates to transformer testings, are periodically detected more particularly in use process to winding pressing force compactibility, to verify the electric power stability whether transformer keeps tolerance short circuit current.Mechanical pulsing effect is applied to transformer, measures the determining peak frequency for measuring the electromotive force power spectral density (PSD) of Response time for incuding generation in its phase winding.Then, the peak frequency for comparing power spectral density (PSD) in transformer phase winding, determines minimum and maximum frequency therein and calculates their ratio.If this ratio is less than threshold value, transformer should exit military service.When above-mentioned ratio is other numerical value, continue to diagnose: if power spectral density (PSD) smallest peaks frequency is more than boundary value, transformer stays military service.Suo Hu threshold value and boundary value are chosen according to the margin of short circuit current, and threshold value can be chosen in (0.5~0.6) range, and boundary value should beIt is chosen in range, in formula, the F is transformer winding pressing force initial value (factory's specified value, unit N), and the α is constant (the unit N/Hz of this kind of model transformer4).Effect: the operational reliability of the transformer by diagnosis is improved, optimizes the cost of repairs for extending its service phase, and shorten the average time for assessing its technology status.
Description
Technical field
The present invention relates to power transformer detection fields, and in particular to a kind of transformer does not dismantle Method of Vibration Diagnosis.
Background technique
Power transformer in use by initial value, (count at short circuit current (К З) its winding pressing force by factory value
Under calculation value, that is, under electric current maximum permissible value, it is ensured that the numerical value of electric power stability) be gradually reduced to current value (residual value,
Short circuit current (К З) reserve factor is used when i.e. due to electrical reticulation design and the numerical value of still certifiable electric power stability).Short circuit
Electric current (К З) reserve factor is the maximum allowable short circuit current of this in electrical reticulation design kind model transformer (К З) for the short of setting
The ratio between road electric current (К З).Therefore, in transformer use process, the compactibility of its winding pressing force should be periodically assessed, with
Guarantee transformer for the electric power stability of short circuit current (К З) design value.
That Jean-Claude Trichet husband, thayer Tan Nuofu, Ao Suotuofu etc. in " power station ", 1995, N8,32-37 pages deliver " according to vibration
The feasibility study of dynamic characteristic diagnosis winding pressing force " a kind of transformer winding pressing force method for detecting vibration is proposed, it is former
Reason is the amplitude-frequency characteristic according to transformer device structure for mechanical pulsing effect vibratory response, assesses this pressing force, but
It is that this method requires bus power-off, disassembly and again assembling transformer.
The method that another kind assesses transformer winding pressing force is to apply mechanical pulsing to transformer device structure and make
With measuring the electromotive force EMP for incuding generation in its phase winding, and determine the peak for measuring the power spectral density of the Response time
Frequency [RU 2117955], but the method lack determining standard in order to detected transformer is drawn be determined as it is qualified (can
Continue to be on active service) and it is unqualified (needing repairing), therefore this method commenting to the technology status for being diagnosed transformer winding pressing force
It is lower to estimate result reliability.If continuing to use the too low transformer of winding pressing force, when short circuit current (К occurs for power supply grid
It will lead to transformer damage when З)；And if it is suitable using be on active service transformer send to maintenance, can improve maintenance cost with
Operation spending.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of transformer and does not dismantle Method of Vibration Diagnosis, can be improved
The use reliability of transformer by diagnosis optimizes its maintenance spending for being used to have an extension of enlistment, while shortening assessment transformation
The average time of device technology status.
Transformer of the invention does not dismantle Method of Vibration Diagnosis, using following technical scheme: applying machine to transformer device structure
Tool impulse action measures the Response time that generation is incuded in its phase winding, and measures the power spectral density of the Response time
(SMP) peak frequency determines minimum frequency and maximum frequency therein and calculates its ratio, such as then according to the peak frequency
Fruit calculates gained ratio and is less than given threshold, then transformer exits military service；If calculating gained ratio is not less than given threshold, after
It is continuous to judge whether the smallest peaks frequency of the power spectral density (SMP) is more than setting boundary value, if being more than, determine to be detected transformation
Device can continue to use.
Preferably, the threshold value and the boundary value are chosen according to short circuit current reserve factor.
Any of the above-described scheme is preferably, and the threshold value is chosen in 0.5~0.6 range.
Any of the above-described scheme is preferably, and the boundary value existsIn range
It chooses, in formula, the F is transformer winding pressing force initial value (factory's specified value, unit N), and the α is this described kind
Constant (the unit N/Hz of model transformer4)。
Specific embodiment
The following description is substantially only exemplary rather than in order to limit the disclosure, application or purposes.It is right below
The specific embodiment that transformer of the invention does not dismantle Method of Vibration Diagnosis is further described.
Pulse-type mechanical effect is applied to tested transformer device structure, tested transformer is such as hit, measures its phase winding and exist
The Response time of generation is incuded under mechanism and determines the Response time power spectral density (the peak frequency of PSD, specific side
Method has made introduction in [RU 2117955], and specific introduction is no longer made in present specification.
To the power spectral density of each phase of transformer winding, (peak PSD frequency fmax is compared to each other, and determines m- phase respectively
With power spectral density (PSD minimum (fmax) m peak frequency and the maximum peak (fmax) n frequency, the calculating for incuding generation in n- phase winding
(fmax) ratio of m/ (fmax) n.Since i- phase peak frequency fmax directly depends on the value of the pressing force in i- winding,
The uneven degree that ratio (fmax) m/ (fmax) n can be reduced with phase winding pressing force each in indication transformer use process is right
In the new transformer that had not been used and the transformer for adjusting by maintenance winding pressing force, the ratio is close to 1.
Firstly, in the first stage, tested transformer is assessed if appropriate for into one according to the ratio of (fmax) m/ (fmax) n
Step uses.If this ratio is lower than the threshold value chosen in (0.5~0.6) range, determine that transformer is not suitable for continuing to make
With.The threshold value of the ratio of (fmax) m/ (fmax) n is set in (0.5~0.6) range, it is ensured that even if in short circuit current
Under (К З) maximum reserve factor, m-i phase winding will not occur and relax because remaining pressing force reduces.Threshold value chooses model
The process of argumentation enclosed is as follows:
In electrical reticulation design, the short circuit current (К З) that uses for the maximum allowable short circuit current of transformer (К З) 30%~
50%, i.e., short circuit current (К З) reserve factor is between 2~3.3.In order to guarantee electrodynamic stability, each phase of transformer
The initial pressing force of winding is not lower than the power that winding is acted at maximum allowable short circuit current (К З).According to Ampere's law,
The active force that winding is subject to is in square with winding current, then the corresponding reserve factor for the pressing force reserved in transformer manufacturing
Between by 4~10.89.In view of the ratio between pressing force F and frequency fmax is known F=α × (fmax)4, (formula
Middle α is the constant of this kind of model transformer, with the acquirement of experience method), then it can determine same pressing force maximum storage phase
(fmax) m/ (fmax) the n ratio adapted to, it is equal to magnitude(if fmax) m/ (fmax) n
Actual ratio be not up to this numerical value, even when (the design short circuit current under the maximum reserve factor of short circuit current (К З)
(К З) is no more than the 30% of maximum permissible value), the remaining pressing force of m-i phase winding is also obviously not sufficient to ensure that short circuit current (К
З) the electric power stability under design value.Selected (0.5~0.6) this range helps to provide out there is enough standards for practice
The threshold value of true property.
For not determining underproof transformer, the pressing force of m-i phase winding (and other windings) in the first stage
(50% that short circuit current (К З) is maximum permissible value is at this moment designed) under the minimum reserve factor of short circuit current (К З) to be subjected to
Compactibility inspection, while should be taken into account that initial pressing force F as defined in factory can guarantee maximum allowable (meter in transformer manufacturing
Calculate) electric power stability under short circuit current (К З).
It is above-mentioned for short circuit current (К З), pressing force F and the power spectral density (research of correlation between the peak PSD frequency
Provide the boundary value of (fmax) m are as follows:Surmounting this boundary value can ensure tested transformer short
Electric power stability under the electric current minimal design reserve factor of road.This range facilitates
Provide out the boundary value for there are enough accuracys for practice.
It is an advantage of the current invention that introduce the standard of certain foundation, tested transformer be divided into qualified product and
The rejected product that should not be further used avoids not to improve the use reliability of the transformer after diagnosis
Necessary maintenance work, simultaneously as can with the transformer of early time discards pressing force obvious low (at least in a winding),
Shorten the time of transformer detection.
Claims (3)
1. a kind of transformer does not dismantle Method of Vibration Diagnosis, including applies mechanical pulsing effect to transformer device structure, its phase is measured
The electromotive force of generation is incuded in winding, determines the peak frequency for measuring the electromotive force power spectral density, it is characterised in that: comparison becomes
The peak frequency of power spectral density in depressor phase winding determines minimum and maximum power therein and calculates its ratio, if this
Ratio is less than given threshold, then determines that transformer should exit military service；If above-mentioned ratio is other numerical value, continue to diagnose:
If power spectral density smallest peaks frequency is more than setting boundary value, transformer can stay use, the threshold value and boundary value
It is chosen according to short circuit current design reserve factor.
2. transformer as described in claim 1 does not dismantle Method of Vibration Diagnosis, it is characterised in that: the threshold value (0.5~
0.6) it is chosen in range.
3. transformer as described in claim 1 does not dismantle Method of Vibration Diagnosis, it is characterised in that: the boundary value existsIt is chosen in range, in formula, the F is that transformer winding pressing force is initial
It is worth (factory's specified value, unit N), the α is constant (the unit N/Hz of this kind of model transformer4)。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2016152714 | 2016-12-30 | ||
| RU2016152714A RU2643940C1 (en) | 2016-12-30 | 2016-12-30 | Method of vibratory unavailable diagnosis of transformer |
| PCT/RU2017/000354 WO2018124927A1 (en) | 2016-12-30 | 2017-05-25 | Method for vibrational in-place transformer diagnostics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109073701A true CN109073701A (en) | 2018-12-21 |
| CN109073701B CN109073701B (en) | 2021-08-10 |
Family
ID=61173865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780024049.2A Active CN109073701B (en) | 2016-12-30 | 2017-05-25 | Vibration diagnosis method without disassembling transformer |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109073701B (en) |
| RU (1) | RU2643940C1 (en) |
| WO (1) | WO2018124927A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3124985B1 (en) * | 2015-07-27 | 2018-01-31 | ABB Schweiz AG | Method for classifying the status of the winding clamping of a power transformer |
| CN111368255B (en) * | 2020-03-06 | 2021-07-20 | 西南交通大学 | Method for evaluating running stability of vehicle-mounted transformer under combined indexes |
| CN112083356B (en) * | 2020-09-10 | 2022-11-04 | 云南电网有限责任公司电力科学研究院 | Method for checking short circuit bearing capacity of transformer |
Citations (12)
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| RU2117955C1 (en) * | 1997-04-10 | 1998-08-20 | Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики | Method of diagnostics of transformer |
| US20010038290A1 (en) * | 2000-05-04 | 2001-11-08 | Coffeen Larry T. | System and method for off-line impulse frequency response analysis test |
| CN1451970A (en) * | 2002-04-03 | 2003-10-29 | Abb技术公开股份有限公司 | Method for identifying abnormal condition in power transformer |
| US20070052426A1 (en) * | 2005-08-01 | 2007-03-08 | Wells Charles H | On-line transformer condition monitoring |
| CN101738567A (en) * | 2008-11-25 | 2010-06-16 | 上海市电力公司 | System and method for detecting transformer winding state by using constant-current sweep frequency power source excitation |
| CN102027660A (en) * | 2008-05-14 | 2011-04-20 | Abb研究有限公司 | A method and a device for estimating the clamping force on a winding package of a transformer or a reactor |
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| CN104236702A (en) * | 2014-08-29 | 2014-12-24 | 国家电网公司 | System and method for judging interior looseness of power transformer |
| CN105137277A (en) * | 2015-09-11 | 2015-12-09 | 西安交通大学 | Diagnosis method of winding machinery state in case of sudden short circuit of transformer |
| CN105182172A (en) * | 2015-07-23 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Vibration signal pattern spectrum-based method for diagnosing winding conditions under sudden short circuit of transformer |
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2016
- 2016-12-30 RU RU2016152714A patent/RU2643940C1/en active
-
2017
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- 2017-05-25 CN CN201780024049.2A patent/CN109073701B/en active Active
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| US20010038290A1 (en) * | 2000-05-04 | 2001-11-08 | Coffeen Larry T. | System and method for off-line impulse frequency response analysis test |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109073701B (en) | 2021-08-10 |
| RU2643940C1 (en) | 2018-02-06 |
| WO2018124927A1 (en) | 2018-07-05 |
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