CN114440783B - Transformer oil tank body deformation monitoring device and method - Google Patents
Transformer oil tank body deformation monitoring device and method Download PDFInfo
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- CN114440783B CN114440783B CN202111676567.7A CN202111676567A CN114440783B CN 114440783 B CN114440783 B CN 114440783B CN 202111676567 A CN202111676567 A CN 202111676567A CN 114440783 B CN114440783 B CN 114440783B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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Abstract
The device comprises a deflection starting unit, an oil pressure starting unit arranged on the wall surface of a transformer oil tank and deflection monitoring units arranged on the wall surface and a top cover of the transformer oil tank, wherein the oil pressure starting unit is connected with the deflection starting unit, the deflection starting unit is connected with the deflection monitoring unit, and the deflection monitoring unit is connected with an alarm unit; the oil pressure starting unit comprises a pressure sensor, and the deflection starting unit comprises a displacement sensor. The deflection monitoring unit is directly arranged on the wall surface and the top cover of the oil tank of the transformer, can quickly sense the deflection change characteristics of the oil tank, and realizes reliable and quick discrimination of the deflection change of the oil tank of the transformer by comparing with a preset threshold value. The application of the invention can be reliably operated for a long time, is not interfered by strong electromagnetism, and has the advantages of high response speed and high measurement frequency.
Description
Technical Field
The invention belongs to the field of power systems, and relates to a device and a method for monitoring deformation of a transformer oil tank body.
Background
The safe operation of the power system is the basis for ensuring the safe and stable transportation of the power and the self safety of the power grid. The transformer is used as important equipment of a power system and is widely applied along with the rapid development of the power system. Especially along with the development of extra-high voltage direct current transmission projects, the operation of a power grid puts higher requirements on the reliability of power transmission and transformation equipment. As core equipment for energy conversion and transmission, once a transformer fails, equipment loss, electric quantity loss and economic loss caused by the transformer are huge, and become key and important influencing factors influencing the safe operation of a power grid. Since 2017, domestic transformers have faults successively to cause fire and explosion accidents, and the accidents cause damage to transformer equipment and major economic loss. The transformer fault causes the oil pressure in the tank to suddenly rise, and further causes the deformation and the fracture of the oil tank, and finally causes the explosion and fire accident. The deflection is the linear displacement of the surface of an object in the direction vertical to the surface when the object is stressed and changed, and can directly reflect the deformation state of the oil tank. Therefore, a reliable and rapid state monitoring device and method for the deflection characteristic of the transformer oil tank are urgently needed.
Disclosure of Invention
The invention aims to provide a state monitoring device and method based on the deflection characteristic of a transformer oil tank, which can realize the monitoring and real-time evaluation of the deformation of a transformer body by monitoring and recording the deflection characteristic of the transformer oil tank.
In order to achieve the purpose, the invention adopts the technical scheme that:
the system comprises a transformer oil tank body deformation monitoring device, an oil pressure starting unit arranged on the wall surface of a transformer oil tank, and a deflection starting unit and a deflection monitoring unit which are arranged on the wall surface and a top cover of the transformer oil tank, wherein the oil pressure starting unit is connected with the deflection starting unit, the deflection starting unit is connected with the deflection monitoring unit, and the deflection monitoring unit is connected with an alarm unit; the oil pressure starting unit comprises a pressure sensor, and the deflection starting unit comprises a displacement sensor.
Furthermore, the distance between the displacement sensor and the surface of the wall surface of the transformer oil tank is 110mm, and the distance between the displacement sensor and the surface of the top cover of the transformer oil tank is 110mm; the sampling frequency of the displacement sensor is 20kHz.
Further, the oil pressure starting unit is used for judging whether the amplitude of the oil pressure characteristic quantity reaches a set oil pressure starting threshold value, if so, a signal is sent to the deflection starting unit, and otherwise, the oil pressure characteristic quantity is continuously measured.
Furthermore, the deflection starting unit is used for measuring deflection change characteristic quantities of the wall surface of the transformer oil tank and the surface of the top cover of the transformer oil tank in real time after receiving a signal of the oil pressure starting unit, and whether the amplitude of the measured deflection change characteristic quantity reaches a set deflection monitoring threshold value or not, if the amplitude reaches the deflection monitoring threshold value, a signal is sent to the deflection monitoring unit, and otherwise, the deflection change characteristic quantity is continuously measured.
Further, the flexibility monitoring unit is used for carrying out Gaussian smoothing processing on the real-time oil tank flexibility characteristic quantity after receiving a signal of the flexibility starting unit, then carrying out multi-layer wavelet transformation to obtain the coefficient value of each layer of wavelet transformation, comparing the modulus of the coefficient value of each layer of wavelet transformation with a threshold T, setting the coefficient value of the wavelet with the modulus smaller than the threshold T to be 0, keeping the coefficient value of the wavelet with the modulus larger than or equal to the threshold T unchanged, then checking the coefficient value of each layer of wavelet, if one point exists and the coefficient value of each layer of wavelet of the point meets the criterion, sending a signal to the alarm unit, otherwise, continuously waiting for the signal of the flexibility starting unit;
furthermore, the alarm unit is used for sending an alarm signal and storing transient deflection data of the oil storage tank after receiving the signal of the deflection monitoring unit.
A deformation monitoring method of a transformer oil tank body based on the device comprises the following steps:
step 1: measuring the oil pressure of insulating oil in the transformer by using a pressure sensor arranged on the transformer to obtain the real-time oil pressure characteristic of the insulating oil;
and 2, step: judging whether the oil pressure characteristic quantity is greater than or equal to an oil pressure starting threshold value or not through an oil pressure starting unit, if so, entering a step 3, otherwise, returning to the step 1;
and 3, step 3: measuring the deflection change of the oil tank by utilizing displacement sensors arranged on the wall surface and the top cover of the transformer to obtain deflection characteristic quantity;
and 4, step 4: judging whether the deflection characteristic quantity is greater than or equal to a deflection starting threshold value or not through the deflection starting unit 2, if the deflection characteristic quantity is greater than or equal to the deflection starting threshold value, entering the step 5, and if not, returning to the step 1;
and 5: the method comprises the steps of conducting Gaussian smoothing processing on real-time oil tank deflection characteristic quantities through a deflection monitoring unit 3, then conducting multi-layer wavelet transformation to obtain wavelet transformation coefficient values of all layers, comparing modulus values of the wavelet transformation coefficient values of all layers with a threshold value T, setting the wavelet coefficient values of which the modulus values are smaller than the threshold value T to be 0, keeping the wavelet coefficient values of which the modulus values are larger than or equal to the threshold value T unchanged, then conducting verification on the wavelet coefficient values of all layers, if one point exists and the wavelet coefficient values of all layers of the point meet criteria, determining that the inside of an oil tank is in fault and entering a step 6, otherwise determining that no fault occurs, and returning to the step 1.
Step 6: and sending a deflection alarm signal through an alarm unit, and simultaneously storing transient oil tank deflection characteristic data of 500ms before and after the alarm.
Further, the oil pressure starting threshold value P set Calculated by the following formula:
P set ＝K oil P max
wherein, K oil Is the oil pressure setting coefficient, P max The maximum value of the oil pressure in the transformer oil tank under normal operation.
Further, the deflection starting threshold value Y set Calculated by the following formula:
Y set ＝K Y Y max
wherein, K Y Is a deflection setting coefficient, Y max The maximum value of the deflection of the transformer oil tank under normal operation.
Further, the criteria of the wavelet transform coefficients are as follows:
wherein (W) n Y)[k]Is n layers of wavelet coefficient values, n is the number of layers, T is the threshold value, and k is the independent variable of the coefficient value after wavelet transform.
Compared with the prior art, the invention has the following beneficial effects:
the invention can quickly sense the oil pressure change characteristics of the insulating oil in the transformer by measuring the oil pressure change characteristics of the insulating oil in real time through the pressure sensor, and overcomes the environment of high temperature, oil stain and strong electromagnetism in the oil tank. The deflection monitoring unit measures the transient deflection characteristics of the metal oil tank by using the displacement sensors arranged on the wall surface and the top cover of the oil tank of the transformer, can quickly sense the deflection change characteristics of the oil tank, realizes reliable and quick discrimination of the deflection change of the oil tank of the transformer by comparing with a preset threshold value, and meets the complex physical environment of arc faults in the transformer oil. The protection device is independent of the power system, is not interfered by signal transmission of the power system, and simultaneously does not generate harmonic interference to influence the power system. The invention has the advantages of simple structure, easy realization, high sensitivity and the like.
The deflection monitoring unit is directly arranged on the wall surface and the top cover of the oil tank of the transformer, can quickly sense the deflection change characteristics of the oil tank, and realizes reliable and quick discrimination of the deflection change of the oil tank of the transformer by comparing with a preset threshold value. The application of the invention can be operated reliably for a long time, is not interfered by strong electromagnetism, and has the advantages of high response speed and high measurement frequency.
Drawings
Fig. 1 is a schematic diagram of a transformer body deformation monitoring device.
FIG. 2 is a logic flow diagram of the present invention.
FIG. 3 is a graph showing the result of measuring the pressure of the insulating oil according to the present invention.
FIG. 4 is a diagram showing the measured deflection result of the present invention.
In the figure, 1 is an oil pressure starting unit, 2 is a deflection starting unit, 3 is a deflection monitoring unit, 4 is an alarm unit, 5-bit top cover of a transformer oil tank, 6 is the wall surface of the transformer oil tank, and 7 is the transformer oil tank.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Referring to fig. 1, the deformation monitoring device for the transformer oil tank body comprises an oil pressure starting unit 1 arranged on the wall surface 6 of the transformer oil tank, and a deflection starting unit 2 and a deflection monitoring unit 3 which are arranged on the wall surface 6 and a top cover 5 of the transformer oil tank, namely, the number of the deflection starting unit 2 and the number of the deflection monitoring unit 3 are 2. The deflection starting units 2 arranged on the wall surface 6 of the transformer oil tank and the top cover 5 are connected with the oil pressure starting unit 1, the deflection starting unit 2 arranged on the wall surface 6 of the transformer oil tank is connected with the deflection monitoring units 3 arranged on the wall surface 6 of the transformer oil tank and the top cover 5, the deflection starting unit 2 arranged on the top cover 5 of the transformer oil tank is connected with the deflection monitoring units 3 arranged on the top cover 5, and the two deflection monitoring units 3 are connected with the alarm unit 4.
The oil pressure starting unit 1 comprises a pressure sensor, the pressure sensor is used for measuring the oil pressure of a transformer oil tank, if the oil pressure reaches a threshold value, a signal is sent to the deflection starting unit 2, and if the oil pressure does not reach the threshold value, the oil pressure characteristic quantity is continuously measured.
The deflection starting unit 2 comprises a displacement sensor which is used for measuring the deflection characteristic quantity of the surfaces of the wall surface 6 of the transformer oil tank and the top cover 5 of the transformer oil tank. The distance between the displacement sensor and the wall surface 6 of the transformer oil tank or the surface of the top cover 5 of the transformer oil tank is 110mm, laser is emitted to the measuring surface, and the deflection change of the surface is measured by comparing the change of the light path. The sampling frequency of the displacement sensor reaches 20kHz.
The deflection starting unit 2 is used for monitoring the deflection of the surface of the wall surface 6 of the transformer oil tank and the surface of the top cover 5 of the transformer oil tank. After receiving a signal sent by the oil pressure starting unit 1, measuring deflection change characteristic quantities of the wall surface 6 of the transformer oil tank and the surface of the top cover 5 of the transformer oil tank in real time through displacement sensors positioned on the wall surface 6 of the transformer oil tank and the top cover 5 of the transformer oil tank, comparing the amplitude of the deflection change characteristic quantities with a deflection monitoring threshold value, judging whether the deflection of the oil tank exceeds the limit, if the amplitude of the deflection change characteristic quantities is greater than or equal to the deflection monitoring threshold value, sending a signal to the deflection monitoring unit 3, and if not, continuously waiting for the signal sent by the oil pressure starting unit 1 to measure the deflection characteristic quantities.
The flexibility monitoring unit 3 is connected with the flexibility starting unit 2 and used for receiving signals sent by the flexibility starting unit 2, after Gaussian smoothing processing is carried out on the real-time oil tank flexibility characteristic quantity through the flexibility monitoring unit 3, multi-layer wavelet transformation is carried out to obtain the coefficient value of each layer of wavelet transformation, the modulus value of each layer of wavelet transformation coefficient value is compared with the threshold value T, the wavelet coefficient value of the modulus value smaller than the threshold value T is set to be 0, the wavelet coefficient value of the modulus value larger than or equal to the threshold value T is unchanged, then the wavelet coefficient value of each layer is checked, if one point exists, and the wavelet coefficient value of each layer of the point meets the criterion, the oil tank is considered to have a fault inside and the step 6 is carried out, otherwise, the oil tank is considered to have no fault, and the step 1 is carried out;
the deflection monitoring unit 3 is used for carrying out wavelet transformation on the real-time oil tank deflection characteristic quantity Y (t) to obtain a wavelet coefficient value, and the specific process is as follows: and (3) performing 3-layer wavelet decomposition on the deflection characteristic quantity signal Y (t) by using a Daubechies5 wavelet as a wavelet basis. And smoothing and denoising the real-time oil tank deflection characteristic quantity Y (t) by using a Gaussian smoothing function omega (t) to obtain a denoised result.
Wherein, the expression of the gaussian smoothing function ω (t) is specifically as follows:
the wavelet basis function is set to psi s (t), where s is the scale of the wavelet basis function:
the calculation formula of the convolution type wavelet transform (wavelet transform for short) is as follows:
where s is the scale of wavelet transform, b is the translation of wavelet transform, t is the time in sampling sequence, and psi s (b) For the wavelet basis function at scale s and translation b, (WY) (s, b) is a convolution type wavelet transform.
The result after denoising treatment is subjected to convolution type wavelet transformation to obtain:
in the formula, ω s (t) is the function of the Gaussian smoothing function in the scale s of the wavelet basis function, k is the independent variable of the coefficient value after wavelet transform, and n is the number of layers. In the present invention n =1,2,3.
After discrete wavelet transform is carried out on the real-time oil tank deflection characteristic quantity Y (t), wavelet coefficient values of all layers, namely the first layer of wavelet coefficient values (W) 1 Y)[k]Value of a second-level wavelet coefficient (W) 2 Y)[k]-layer 3 wavelet coefficient values (W) 3 Y)[k]}。
When the transformer normally runs, the deflection variable quantity is subjected to wavelet decomposition to obtain a wavelet coefficient value, and the maximum value of the wavelet coefficient value is used as a threshold value T. Wavelet coefficient value for each layer { (W) n Y)[k]Comparing the modulus value of the wavelet coefficient with a threshold value T, setting the wavelet coefficient value with the modulus value smaller than the threshold value T as 0, and keeping the wavelet coefficient value with the modulus value larger than or equal to the threshold value T unchanged, wherein n =1,2,3.
And then checking the wavelet coefficient value of each layer, if one point exists, and the wavelet coefficient value of each layer of the point meets the following formula, namely the point is a signal fault point.
The multi-time wavelet transformation is beneficial to screening global maximum points, and the influence on final judgment caused by the occurrence of local maximum points is avoided.
Referring to fig. 2, the method for monitoring transient characteristics of deflection of the transformer tank comprises the following steps:
step 1: after the device is electrified and started, reading a preset oil pressure starting threshold value P set And deflection monitoring threshold value Y set ；
Threshold value P for oil pressure starting set The following settings are set:
P set ＝K oil P max
wherein, K oil For the setting coefficient of oil pressure, 1.5 max The maximum value of the oil pressure in the transformer oil tank under normal operation is obtained. Deflection starting threshold value Y set The following settings are set:
Y set ＝K Y Y max
wherein, K Y Taking 1.2, Y as the deflection setting coefficient max The maximum value of the flexibility of the transformer oil tank in normal operation is obtained.
Step 2: measuring the oil pressure of insulating oil in the transformer by using a pressure sensor arranged on the transformer to obtain the real-time oil pressure characteristic quantity P (t) of the insulating oil;
and step 3: comparing whether the real-time oil pressure characteristic quantity P (t) of the insulating oil is more than or equal to an oil pressure starting threshold value P or not by an oil pressure starting unit set . If the real-time oil pressure characteristic quantity P (t) of the insulating oil is greater than or equal to the oil pressure starting threshold value, namely P (t) is greater than or equal to P set If the oil pressure is not started, returning to the step 2;
and 4, step 4: measuring deflection change of the oil tank by using displacement sensors arranged on the wall surface 6 and the top cover 5 of the transformer oil tank, and reading a real-time deflection characteristic quantity Y (t) of the oil tank;
and 5: the deflection starting unit 2 is used for comparing whether the deflection characteristic quantity Y (t) of the real-time oil tank is more than or equal to the deflection monitoring threshold value Y set Whether the criterion Y (t) is satisfied is equal to or greater than Y set . Judging whether the deflection of the oil tank exceeds the limit, if the deflection of the oil tank meets the criterion Y (t) or not, judging whether the deflection of the oil tank exceeds the limit or not, if so, the deflection of the oil tank meets the criterion Y (t) or not set And (3) if the real-time oil tank deflection characteristic quantity Y (t) is greater than or equal to the deflection monitoring threshold value, the deflection of the oil tank is considered to be over-limit, and the step 6 is entered, otherwise, the deflection of the oil tank is not over-limit, and the step 2 is returned.
And 6: after the real-time oil tank deflection characteristic quantity is subjected to Gaussian smoothing processing through a deflection monitoring unit 3, multi-layer wavelet transformation is carried out to obtain the wavelet transformation coefficient values of all layers, the modulus value of the wavelet transformation coefficient value of each layer is compared with a threshold value T, the wavelet coefficient value of which the modulus value is smaller than the threshold value T is set to be 0, the wavelet coefficient value of which the modulus value is larger than or equal to the threshold value T is unchanged, then the wavelet coefficient value of each layer is checked, if one point exists and the wavelet coefficient value of each layer of the point meets the following formula, the oil tank is considered to have a fault inside and enter a step 7, otherwise, the oil tank is considered to have no fault, and the step 2 is returned.
And 7: and (3) sending a deflection alarm signal through an alarm unit, simultaneously storing transient oil tank deflection characteristic data of 500ms before and after the alarm, and resetting the whole device.
Referring to fig. 3, it can be seen that the oil pressure of the insulating oil inside the transformer has a significant and rapid change, which is beneficial to monitoring the state of the transformer as a state characteristic quantity. When the oil pressure in the transformer is larger than or equal to the set oil pressure starting threshold value, a signal can be rapidly sent to the deflection monitoring unit.
Referring to fig. 4, it can be seen that the characteristic deflection quantity of the transformer tank can be changed significantly, which is beneficial to directly and rapidly reflecting the state characteristic of the transformer. And the wavelet transformation can be used for conveniently judging whether the abnormity occurs and the position of the abnormal point. The method expands the existing transformer state monitoring method for the deflection monitoring of the transformer oil tank, and simultaneously directly and rapidly reflects the deformation state of the transformer, thereby being beneficial to actively preventing the transformer from breaking and explosion accidents and reducing the economic loss.
The invention organically combines and reasonably collocates the oil pressure starting unit, the deflection monitoring unit and the alarming unit, so that the whole protection device and method have simple structure, easy realization and high sensitivity.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure allows variations. But all changes which come within the scope of the invention are intended to be embraced therein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Claims (8)
1. The deformation monitoring device of the transformer oil tank body is characterized by comprising an oil pressure starting unit (1) arranged on the wall surface (6) of the transformer oil tank, and a deflection starting unit (2) and a deflection monitoring unit (3) which are arranged on the wall surface (6) and a top cover (5) of the transformer oil tank, wherein the oil pressure starting unit (1) is connected with the deflection starting unit (2), the deflection starting unit (2) is connected with the deflection monitoring unit (3), and the deflection monitoring unit (3) is connected with an alarm unit (4); the oil pressure starting unit (1) comprises a pressure sensor, the deflection starting unit (2) comprises a displacement sensor, the distance between the displacement sensor and the surface of the wall surface (6) of the transformer oil tank is 110mm, the distance between the displacement sensor and the surface of the top cover (5) of the transformer oil tank is 110mm, and the sampling frequency of the displacement sensor is 20kHz;
the flexibility monitoring unit (3) is used for carrying out Gaussian smoothing treatment on the flexibility characteristic quantity of the real-time oil tank after receiving the signal of the flexibility starting unit (2), then carrying out multi-layer wavelet transformation to obtain the coefficient value of each layer of wavelet transformation, comparing the modulus of the coefficient value of each layer of wavelet transformation with a threshold T, setting the wavelet coefficient value of which the modulus is smaller than the threshold T to be 0, keeping the wavelet coefficient value of which the modulus is larger than or equal to the threshold T unchanged, then checking the wavelet coefficient value of each layer, if a point exists and the wavelet coefficient value of each layer of the point meets the criterion, considering that the inside of the oil tank has a fault, sending a signal to the alarm unit (4), and if not, continuing to wait for the signal of the flexibility starting unit (2).
2. The deformation monitoring device for the transformer tank body according to claim 1, wherein the oil pressure starting unit (1) is used for judging whether the amplitude of the oil pressure characteristic quantity reaches a set oil pressure starting threshold value, if so, sending a signal to the deflection starting unit (2), otherwise, continuously measuring the oil pressure characteristic quantity.
3. The deformation monitoring device for the transformer tank body according to claim 1, wherein the deflection starting unit (2) is used for measuring deflection change characteristic quantities of the wall surface (6) of the transformer tank and the surface of the top cover (5) of the transformer tank in real time after receiving a signal of the oil pressure starting unit (1), judging whether the amplitude of the measured deflection change characteristic quantities reaches a set deflection monitoring threshold value, if so, sending a signal to the deflection monitoring unit (3), and otherwise, continuously measuring the deflection change characteristic quantities.
4. The deformation monitoring device for the transformer oil tank body according to claim 1, wherein the alarm unit (4) is used for sending an alarm signal and storing transient deflection data of the oil tank after receiving a signal of the deflection monitoring unit (3).
5. A deformation monitoring method for a transformer oil tank body based on the device of claim 1 is characterized by comprising the following steps:
step 1: measuring the oil pressure of insulating oil in the transformer by using a pressure sensor arranged on the transformer to obtain the real-time oil pressure characteristic of the insulating oil;
step 2: judging whether the oil pressure characteristic quantity is greater than or equal to an oil pressure starting threshold value or not through an oil pressure starting unit (1), if so, entering a step 3, otherwise, returning to the step 1;
and 3, step 3: measuring the deflection change of the oil tank by using displacement sensors arranged on the wall surface and the top cover of the transformer to obtain deflection characteristic quantity;
and 4, step 4: judging whether the deflection characteristic quantity is greater than or equal to a deflection starting threshold value or not through the deflection starting unit (2), if the deflection characteristic quantity is greater than or equal to the deflection starting threshold value, entering the step 5, otherwise, returning to the step 1;
and 5: after Gaussian smoothing is carried out on the real-time oil tank deflection characteristic quantity through a deflection monitoring unit (3), multi-layer wavelet transformation is carried out to obtain wavelet transformation coefficient values of all layers, the modulus value of the wavelet transformation coefficient value of each layer is compared with a threshold value T, the wavelet coefficient value of which the modulus value is smaller than the threshold value T is set to be 0, the wavelet coefficient value of which the modulus value is larger than or equal to the threshold value T is unchanged, then the wavelet coefficient value of each layer is checked, if one point exists and the wavelet coefficient value of each layer of the point meets the criterion, the oil tank is considered to have a fault inside and enter the step 6, otherwise, the oil tank is considered to have no fault, and the step 1 is returned;
and 6: and sending a deflection alarm signal through an alarm unit, and simultaneously storing transient oil tank deflection characteristic data of 500ms before and after the alarm.
6. The method for monitoring deformation of a transformer tank body according to claim 5, wherein the oil pressure start threshold value P is set set Calculated by the following formula:
P set ＝K oil P max
wherein, K oil To set the coefficient of oil pressure, P max The maximum value of the oil pressure in the transformer oil tank under normal operation is obtained.
7. The method for monitoring deformation of a transformer tank body according to claim 5, wherein the deflection starting threshold value Y is set Calculated by the following formula:
Y set ＝K Y Y max
wherein, K Y Is a deflection setting coefficient, Y max The maximum value of the flexibility of the transformer oil tank in normal operation is obtained.
8. The deformation monitoring method for the transformer oil tank body according to claim 5, wherein the criteria are as follows:
wherein (W) n Y)[k]Is n layers of wavelet coefficient values, n is the number of layers, T is the threshold value, and k is the independent variable of the coefficient value after wavelet transform.
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| CN112630643B (en) * | 2020-12-14 | 2023-04-28 | 国网经济技术研究院有限公司 | Device and method for monitoring state of top cover of converter transformer on-load voltage regulating switch |
| CN112635214B (en) * | 2020-12-14 | 2022-05-20 | 西安交通大学 | Converter transformer on-load voltage regulation switch top cover deformation protection device and method |
| CN112701660B (en) * | 2020-12-14 | 2021-11-19 | 西安交通大学 | Integrated device and method for monitoring and protecting deformation of top cover of on-load voltage regulating switch |
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| CN112432723A (en) * | 2019-08-25 | 2021-03-02 | 天津大学 | Puncture force measuring device and method based on laser speckle interference principle |
| CN110907748A (en) * | 2019-10-21 | 2020-03-24 | 贵州电网有限责任公司 | Distribution lines travelling wave fault acquisition and analysis device and fault positioning system |
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