CN106682332A - Method for normalization of transformer winding vibration accelerations at different temperatures - Google Patents
Method for normalization of transformer winding vibration accelerations at different temperatures Download PDFInfo
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- CN106682332A CN106682332A CN201611266560.7A CN201611266560A CN106682332A CN 106682332 A CN106682332 A CN 106682332A CN 201611266560 A CN201611266560 A CN 201611266560A CN 106682332 A CN106682332 A CN 106682332A
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Abstract
The invention provides a method for normalization of transformer winding vibration accelerations at different temperatures. Winding vibration signals of a transformer at different oil temperatures are obtained; a relation curve of the temperature of the transformer oil and winding vibration acceleration fundamental frequency amplitude is established, and a slope of curve is utilized to normalize the transformer winding vibration accelerations at the different temperatures. Through the normalization of the transformer winding vibration accelerations at the different temperatures, a power transformer fault diagnosis technology is improved, and manpower and material resources are improved.
Description
Technical field
The present invention relates under field transformer, more particularly to a kind of different temperatures transformer winding vibration acceleration normalizing
Change method.
Background technology
Power transformer, as the node of bulk power grid, is one of particularly significant equipment in power system, it safe and reliable
Operation directly affects the security and stability of electrical network.With the fast development of economic society, the electrical network grade of China is improved constantly,
Power transformer also develops towards greater degree and more jumbo direction.On the other hand, the working environment pole of power transformer
It is severe, and short-circuit impact, aging, lightning impulse etc. factor inevitably causes such as winding displacement, winding deformation, iron core
Displacement etc. failure is serious to threaten power transformer safe and reliable operation.Therefore, the fault diagnosis technology of power transformer is more next
More it is subject to attention both domestic and external, the Transformer's Condition Monitoring technology based on transformer vibration signal to realize becoming electric power because of it
Depressor realizes that the advantage of on-line monitoring gets growing concern for.
Power transformer, due to there is inevitable copper loss and iron loss, can cause transformer oil in running
Temperature can be raised.The generation and transmittance process that oil temperature is vibrated on transformator has certain impact.Transformation is proposed in prior art
The magnetostriction of device ferrum is non-linear phenomena, and temperature has certain impact on it；Oil temperature is shaken by affecting the viscosity influence of transformer oil
The dynamic process for being delivered to tank surface；The change of temperature can cause the width of the change forced oscillation of transformer device structure natural frequency
Value.Drawn by experimentation, transformer-cabinet vibration rises linear growth trend with oil temperature, and temperature coefficient is in 0.005-
It is unrelated with transformer capacity in the range of 0.035.Raise with temperature around the elastic modelling quantity of insulating board and decline, winding construction rigidity
Change is produced, vibration characteristics changes therewith.The impact for all clearly explaining temperature to transformator difference part is studied before, and
Impact to transformer vibration signal.But there is presently no and propose to carry out the multiple amplitude of basket vibration signal under different temperatures
Normalized method, as a result can only exactly test the vibration signal under measurement high temperature, waste a large amount of manpower and materials.
The content of the invention
In order to overcome above-mentioned deficiency of the prior art, it is an object of the present invention to provide transformation under a kind of different temperatures
The method for normalizing of device basket vibration acceleration, method for normalizing includes：
S1：Obtain basket vibration signal of the transformator under different oil temperatures；
S2：The temperature of transformer oil and the relation curve of basket vibration acceleration fundamental frequency amplitude are set up, using the slope of curve
Basket vibration acceleration under different temperatures is normalized, normalization formula is as follows：
In formula, anFor transformer oil be room temperature when, winding acceleration vibration amplitude, aTFor temperature of the transformer oil in test
Under degree, winding acceleration amplitude, k be transformer oil test when temperature homologous thread on put slope, Δ T for measure temperature with
The difference of room temperature, calculate λ be nondimensional normalization, represent room temperature under winding acceleration vibration amplitude with measure winding acceleration
The ratio of amplitude.
Preferably, step S1 also includes：
Obtain the basket vibration signal under transformator difference oil temperature；
According to single-phase transformer structural symmetry, at least two collection points are set on transformer-cabinet surface, gather transformation
Device basket vibration acceleration signal, the set location of collection point is to avoid the nonlinear organization of transformer case.
Preferably, four collection points are set on transformer-cabinet surface.
Preferably, also include after step S2：
Transformator repeat step S1 and step S2 to different electric pressures, obtains basket vibration acceleration under different temperatures
Fundamental frequency amplitude, sets up the relation curve of temperature and basket vibration acceleration amplitude, and seeks transformer oil at test temperature, and institute is right
The meansigma methodss of the slope k put on curve are answered, normalization formula is substituted into.
Preferably, also include after step S2：
Transformator repeat step S1 and step S2 to different structure, obtains basket vibration acceleration fundamental frequency under different temperatures
Amplitude, sets up the relation curve of temperature and basket vibration acceleration amplitude, and seeks transformer oil at test temperature, corresponding song
The meansigma methodss of the slope k put on line, substitute into normalization formula.
Preferably, in step S2：
K=7.3217e-4.
Preferably, step S1 also includes：
The oil temperature of transformator is the meansigma methodss of top-oil temperature and bottom oil temperature.
As can be seen from the above technical solutions, the present invention has advantages below：
The present invention proposes the method for normalizing of transformer winding vibration acceleration under different temperatures, improves power transformer
The fault diagnosis technology of device, has saved manpower and materials.
Description of the drawings
In order to be illustrated more clearly that technical scheme, will make simple to the accompanying drawing to be used needed for description below
Introduce on ground, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill
For personnel, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the method for normalizing flow chart of transformer winding vibration acceleration under different temperatures；
Fig. 2 is the temperature of transformer oil and the graph of relation of basket vibration acceleration fundamental frequency amplitude；
Fig. 3 is transformer-cabinet schematic diagram；
Fig. 4 is the temperature of transformer oil and the relation preferred embodiment curve chart of basket vibration acceleration fundamental frequency amplitude.
Specific embodiment
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below will be with specific
Embodiment and accompanying drawing, are clearly and completely described, it is clear that enforcement disclosed below to the technical scheme of present invention protection
Example is only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in this patent, the common skill in this area
All other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model of this patent protection
Enclose.
The present invention provides a kind of method for normalizing of transformer winding vibration acceleration under different temperatures, such as Fig. 1 and Fig. 2 institutes
Show, method for normalizing includes：
S1：Obtain the basket vibration signal under transformator difference oil temperature；
S2：The temperature of transformer oil and the relation curve of basket vibration acceleration fundamental frequency amplitude are set up, using the slope of curve
Basket vibration acceleration under different temperatures is normalized, normalization formula is as follows：
In formula, anFor transformer oil be room temperature when, winding acceleration vibration amplitude, aTFor temperature of the transformer oil in test
Under degree, winding acceleration amplitude, k be transformer oil test when temperature homologous thread on put slope, Δ T for measure temperature with
The difference of room temperature, calculate λ be nondimensional normalization, represent room temperature under winding acceleration vibration amplitude with measure winding acceleration
The ratio of amplitude.The oil temperature of transformator is the meansigma methodss of top-oil temperature and bottom oil temperature.
In the present invention, step S1 also includes：Obtain the basket vibration signal under transformator difference oil temperature.
According to single-phase transformer structural symmetry, at least two collection points are set on transformer-cabinet surface, gather transformation
Device basket vibration acceleration signal, the set location of collection point is to avoid the nonlinear organization of transformer case.Such as reinforcement,
The vibration signal that guarantee is collected is contaminated minimum.As shown in figure 3, the tank surface 6 in transformator 5 arranges four collections
Point.Four collection points are respectively collection point 1, collection point 2, collection point 3, collection point 4.
In the present invention, transformator repeat step S1 and step S2 to different electric pressures obtains winding under different temperatures
Acceleration of vibration fundamental frequency amplitude, sets up the relation curve of temperature and basket vibration acceleration amplitude, and seeks transformer oil in test
At a temperature of, the meansigma methodss of the slope k put on corresponding curve substitute into normalization formula.
As shown in figure 4, by taking the curve 7 in Fig. 4 as an example, obtaining the basket vibration signal under transformator difference oil temperature；Set up
The temperature of transformer oil and the relation curve 7 of basket vibration acceleration fundamental frequency amplitude, using the slope of curve by under different temperatures
Basket vibration acceleration is normalized.Wherein it is determined that during slope k, transformer oil is when test temperature is 25 DEG C, and correspondence is bent
Point 11 on line 7, transformer oil when test temperature is 30 DEG C, the point 12 on homologous thread 7, transformer oil is in test temperature
When 35 DEG C, the point 13 on homologous thread 7, transformer oil test temperature be 40 DEG C when, the point 14 on homologous thread 7, transformator
Oil test temperature be 45 DEG C when, the point 15 on homologous thread 7, transformer oil test temperature be 47 DEG C when, on homologous thread 7
Point 16.The slope put on curve 7 at 11, the slope at point 12, the slope at point 13, the slope at point 14, point are obtained respectively
Above-mentioned slope is carried out meansigma methodss computing and obtains slope k by the slope at 15, the slope at point 16, substitutes into normalization formula.Certainly
The value that the point taken on curve gets over multi slope k is more accurate.
In addition to transformator repeat step S1 and step S2 to different electric pressures, also to the transformator of different structure
Repeat step S1 and step S2, obtain basket vibration acceleration fundamental frequency amplitude under different temperatures, set up temperature and add with basket vibration
The relation curve of velocity amplitude, and seek transformer oil at test temperature, the meansigma methodss of the slope k put on corresponding curve, generation
Enter normalization formula.Specific algorithm is as described above.
Preferably, k=7.3217e-4.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (7)
1. under a kind of different temperatures transformer winding vibration acceleration method for normalizing, it is characterised in that method for normalizing bag
Include：
S1：Obtain basket vibration signal of the transformator under different oil temperatures；
S2：The temperature of transformer oil and the relation curve of basket vibration acceleration fundamental frequency amplitude are set up, will not using the slope of curve
Basket vibration acceleration under synthermal is normalized, and normalization formula is as follows：
In formula, anFor transformer oil be room temperature when, winding acceleration vibration amplitude, aTFor transformer oil test when at a temperature of,
Winding acceleration amplitude, k is the slope that transformer oil is put in test on temperature homologous thread, and Δ T is to measure temperature and room temperature
Difference, calculate λ be nondimensional normalization, represent room temperature under winding acceleration vibration amplitude with measure winding acceleration amplitude
Ratio.
2. under different temperatures according to claim 1 transformer winding vibration acceleration method for normalizing, its feature exists
In step S1 also includes：
Obtain the basket vibration signal under transformator difference oil temperature；
According to single-phase transformer structural symmetry, at least two collection points are set on transformer-cabinet surface, collection transformator around
Group vibration acceleration signal, the set location of collection point is to avoid the nonlinear organization of transformer case.
3. under different temperatures according to claim 1 transformer winding vibration acceleration method for normalizing, its feature exists
In,
On transformer-cabinet surface, four collection points are set.
4. under different temperatures according to claim 1 transformer winding vibration acceleration method for normalizing, its feature exists
In also including after step S2：
Transformator repeat step S1 and step S2 to different electric pressures, obtains basket vibration acceleration fundamental frequency under different temperatures
Amplitude, sets up the relation curve of temperature and basket vibration acceleration amplitude, and seeks transformer oil at test temperature, corresponding song
The meansigma methodss of the slope k put on line, substitute into normalization formula.
5. under different temperatures according to claim 1 transformer winding vibration acceleration method for normalizing, its feature exists
In also including after step S2：
Transformator repeat step S1 and step S2 to different structure, obtains basket vibration acceleration fundamental frequency width under different temperatures
Value, sets up the relation curve of temperature and basket vibration acceleration amplitude, and seeks transformer oil at test temperature, corresponding curve
The meansigma methodss of the slope k of upper point, substitute into normalization formula.
6. under different temperatures according to claim 1 transformer winding vibration acceleration method for normalizing, its feature exists
In in step S2：
K=7.3217e-4.
7. under different temperatures according to claim 1 transformer winding vibration acceleration method for normalizing, its feature exists
In step S1 also includes：
The oil temperature of transformator is the meansigma methodss of top-oil temperature and bottom oil temperature.
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| CN201611266560.7A CN106682332B (en) | 2016-12-31 | 2016-12-31 | Normalization method for vibration acceleration of transformer winding at different temperatures |
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| CN201611266560.7A CN106682332B (en) | 2016-12-31 | 2016-12-31 | Normalization method for vibration acceleration of transformer winding at different temperatures |
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| US20100191484A1 (en) * | 2009-01-27 | 2010-07-29 | Baker Hughes Incorporated | Electrical Submersible Pump Rotation Sensing Using An XY Vibration Sensor |
| CN104034289A (en) * | 2014-07-04 | 2014-09-10 | 国家电网公司 | Condition monitoring method and device for windings of power transformer |
| CN104914327A (en) * | 2015-05-06 | 2015-09-16 | 北京航空航天大学 | Transformer fault maintenance prediction method based on real-time monitoring information |
| CN105093059A (en) * | 2015-08-26 | 2015-11-25 | 云南电网有限责任公司电力科学研究院 | Transformer winding work state detection method based on normalization singular spectrum entropies |
| CN106055888A (en) * | 2016-05-27 | 2016-10-26 | 国网上海市电力公司 | Predication method and device for top-oil temperature of transformer based on error predicting amendment |
-
2016
- 2016-12-31 CN CN201611266560.7A patent/CN106682332B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100191484A1 (en) * | 2009-01-27 | 2010-07-29 | Baker Hughes Incorporated | Electrical Submersible Pump Rotation Sensing Using An XY Vibration Sensor |
| CN104034289A (en) * | 2014-07-04 | 2014-09-10 | 国家电网公司 | Condition monitoring method and device for windings of power transformer |
| CN104914327A (en) * | 2015-05-06 | 2015-09-16 | 北京航空航天大学 | Transformer fault maintenance prediction method based on real-time monitoring information |
| CN105093059A (en) * | 2015-08-26 | 2015-11-25 | 云南电网有限责任公司电力科学研究院 | Transformer winding work state detection method based on normalization singular spectrum entropies |
| CN106055888A (en) * | 2016-05-27 | 2016-10-26 | 国网上海市电力公司 | Predication method and device for top-oil temperature of transformer based on error predicting amendment |
Non-Patent Citations (3)
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| T. NAGATA 等: "Estimation on on-load vibration of transformer windings", 《2002 IEEE POWER ENGINEERING SOCIETY WINTER MEETING. CONFERENCE PROCEEDINGS (CAT. NO.02CH37309)》 * |
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