CN211697657U - Transformer winding ultrasonic array online detection device with attenuation compensation module - Google Patents
Transformer winding ultrasonic array online detection device with attenuation compensation module Download PDFInfo
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- CN211697657U CN211697657U CN201922489200.9U CN201922489200U CN211697657U CN 211697657 U CN211697657 U CN 211697657U CN 201922489200 U CN201922489200 U CN 201922489200U CN 211697657 U CN211697657 U CN 211697657U
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Abstract
The utility model relates to a transformer winding ultrasonic wave array on-line measuring device with attenuation compensation module belongs to transformer winding on-line measuring device. The n ultrasonic high-voltage driving circuit channels are respectively and electrically connected with the respective 400k transmitting transducers, the n 400k receiving transducers are electrically connected with the respective echo signal preprocessing circuit channels, and the echo signal preprocessing circuit channels are respectively and electrically connected with the respective attenuation compensation modules. The advantage is novel structure, utilizes multichannel ultrasonic wave method to detect transformer winding's deformation situation, and is more simple and convenient than traditional method operation, and the detection device volume reduces greatly, and is more portable, and the operation flow of detection is more simple and convenient, has reduced the detection cycle and has realized portable detection basically, adopts the decay compensation module, utilizes the characteristic of degree of depth time gain compensation circuit, enlargies the useful ultrasonic signal that comes from the far-end reflection, can show the degree of accuracy that improves the judgement.
Description
Technical Field
The utility model belongs to transformer winding on-line measuring device especially indicates a transformer winding ultrasonic wave array on-line measuring device with decay compensation module.
Background
The power transformer has the important functions of transmitting and distributing electric energy, is an indispensable electric power device in an electric power system, and the safe and stable operation of the power transformer is related to the safety and the stability of the whole electric power system. According to related statistical investigation, among common causes of power transformer faults, winding faults are the main cause of accidents, and account for more than two thirds of the causes of various accidents.
Winding deformation refers to the irreversible change in shape and size of a winding coil caused by various internal and external factors. After the winding is deformed, the solid insulation of the winding is damaged, so that the electromagnetic model of the winding is changed; partial discharge may occur, the windings are broken down when the transformer is struck by lightning; the heat dissipation oil circuit of the transformer winding is not smooth, the internal temperature of the transformer is abnormal, and the normal work is influenced.
At present, the detection methods for the transformer winding mainly include a Low Voltage pulse method (LVI), a Short-Circuit impedance method (SCR), a frequency response Analysis method (FRA), and a frequency sweep impedance method, where:
(1) short circuit impedance method
The short-circuit impedance method is a method for deducing the deformation condition of the transformer winding by analyzing the change conditions before and after the short-circuit impedance. Generally, for the same power transformer, the short-circuit impedance of the winding depends only on the geometry of the winding. The overall displacement, axial local deformation, radial local deformation and the like of the winding can cause the short-circuit impedance to change, namely the deformation of the winding can cause the change of the short-circuit impedance. The winding short-circuit reactance is also commonly referred to as winding leakage reactance, so the change degree of the leakage reactance can be used for reflecting the health state of the winding, and the method is an important theoretical basis of the short-circuit reactance method.
(2) Low voltage pulse method
The low voltage pulse method is also referred to as LVI method for short. When the frequency exceeds a certain range, the influence brought by the iron core can be ignored, when the structure of the transformer winding changes, the structure parameters of the network can change, the change of the structure parameters can cause the change of the low-voltage pulse response of the whole network, the health state of the winding is reflected through the response change condition of the low-voltage pulse, and the theoretical basis for detecting the winding deformation by the low-voltage pulse method is provided.
In the early days, people detected the low-voltage impulse response of the transformer winding through an oscilloscope, and the mode is relatively lagged behind. With the advance of science and technology, a variety of advanced signal processing methods are applied, and more complex time domain signals can be rapidly processed and analyzed. Therefore, normalized low-voltage pulse detection equipment is gradually developed and applied to actual winding detection.
(3) Frequency response analysis method
The frequency response analysis method is also called as FRA method, similar to LVI method, when the frequency is larger than a certain value, the distribution of zero poles of the equivalent network transfer function of the transformer winding is directly related to the structural size of the transformer winding, therefore, when the winding state is damaged or distorted, the network transfer function is changed correspondingly. The FRA method is a theoretical basis for the frequency response method, which reflects the deformation of the winding by detecting the change of the transfer function curve over a wide frequency band. The main difference between the FRA method and the LVI method is the difference in the frequency domain. The frequency sweep signal generator outputs a frequency sweep signal to the transformer winding. Then the data acquisition card collects the input and output signals of the data acquisition card, and a corresponding frequency spectrum curve is generated and analyzed by the upper computer. In actual testing, changes in winding state can cause distortion or deviation in the spectral curve. Through comparison with the historical frequency spectrum, the health condition of the transformer winding can be judged.
(4) Frequency sweep impedance method
The frequency sweep impedance method is a winding detection method which is emerging in recent years, and can be regarded as a combination of an SCR method and an FRA method, and the short-circuit impedance condition and the frequency response curve of a transformer winding can be obtained through a test. The system adopts different equivalent circuits in a low-frequency band and a high-frequency band, wherein the low-frequency band equivalent circuit is similar to that of the SCR method, and the high-frequency band equivalent circuit is similar to that of the FRA method. Therefore, the sweep frequency impedance method has wider application range than the SCR method and the FRA method, and has better application prospect.
On the other hand, as can be seen from the above principle, the short-circuit impedance method, the low-voltage pulse method, and the frequency response method all require the energization of the transformer winding for testing, and therefore, the power failure inspection is necessary, which means that the transformer substation needs to pay a large economic cost, and the deformation of the winding cannot be known in time. In order to combine the advantages of the short-circuit impedance method and the frequency response method, the frequency-sweep impedance method is proposed and studied in a large quantity, so that the natural defects shared by the two methods are difficult to overcome essentially.
On the other hand, the short-circuit impedance method, the low-voltage pulse method, the frequency response method and the frequency sweep impedance method are based on the principle that whether a deformation fault exists or not is judged by measuring the characteristics of the series circuit of the transformer winding, and the deformation of different parts of the same winding is reflected on the change of the electrical characteristics and is always the same, so that even if the winding fault is detected by the short-circuit resistance method, the low-voltage pulse method and the frequency response method, the deformation is difficult to position, and the intuitive and quantitative detection cannot be achieved.
Disclosure of Invention
The utility model provides a transformer winding ultrasonic wave array on-line measuring device with attenuation compensation module, the purpose carries out indirect measurement to the winding through the ultrasonic wave, need not to test winding access circuit, accomplishes electrified detection, directly perceived, quantization detection winding situation.
The utility model adopts the technical proposal that: the n ultrasonic high-voltage driving circuit channels are respectively and electrically connected with respective 400k transmitting transducers, the n 400k receiving transducers are electrically connected with respective echo signal preprocessing circuit channels, and the echo signal preprocessing circuit channels are respectively and electrically connected with respective attenuation compensation modules;
the attenuation compensation module structure is as follows: the band-pass filter is connected in series with the time gain amplifier, the low-pass filter and the A/D converter, and the D/A converter is electrically connected with the time gain amplifier.
The utility model has the advantages of novel structure utilizes multichannel ultrasonic wave method to detect transformer winding's deformation situation, and is more simple and convenient than traditional method operation, and the detection device volume reduces greatly, and is more portable, and the operation flow of detection is more simple and convenient, has reduced the detection cycle greatly and has realized portable detection basically, adopts the decay compensation module, utilizes the characteristic of degree of depth time gain compensation circuit, enlargies the useful ultrasonic signal that comes from the distal end reflection, can show the degree of accuracy that improves the judgement.
Drawings
Fig. 1 is a schematic block circuit diagram of the present invention;
fig. 2 is a schematic block circuit diagram of the attenuation compensation module of the present invention;
FIG. 3 is a schematic diagram of the ultrasonic high-voltage driving circuit of the present invention;
fig. 4 is a schematic diagram of the echo signal preprocessing circuit of the present invention;
fig. 5 is a schematic diagram of the band-pass filter circuit of the attenuation compensation module of the present invention;
Detailed Description
Referring to fig. 1, n ultrasonic high-voltage driving circuit channels are respectively electrically connected with respective 400k transmitting transducers, n 400k receiving transducers are electrically connected with respective echo signal preprocessing circuit channels, and the echo signal preprocessing circuit channels are respectively electrically connected with respective attenuation compensation modules;
referring to fig. 2, the attenuation compensation module structure is: the band-pass filter is connected in series with the time gain amplifier, the low-pass filter and the A/D converter, and the D/A converter is electrically connected with the time gain amplifier.
When the system works, firstly, the multi-channel ultrasonic high-voltage driving circuit generates 400kHz high-frequency square wave pulse signals, respectively excites each 400k transmitting transducer to transmit ultrasonic signals, then, after the multi-channel ultrasonic waves penetrate through transformer oil to be transmitted, the 400k receiving transducers receive echo signals, an echo signal preprocessing circuit processes the echo signals, the processed echo signals enter the attenuation compensation module to be processed, processed data results are transmitted to an upper computer, and the upper computer obtains the results.
Referring to fig. 3, the main function of the transmit drive circuit is to drive the transmit transducer to emit an ultrasonic signal. Because the selected transducer has high power, high-voltage pulses with peak values of hundreds of volts are needed to realize excitation. When the system works, 5V low-voltage pulse is input from SSP, and the pulse frequency is 400 kHz. The low-voltage pulse signal is used for controlling the on-off of the MOSFET 1, and further controlling the operation of the pulse boosting transformer T1. The primary side of T1 is inputted with 24V voltage signal, when SSP has pulse signal input and Q1 is conducted, the primary side of T1 generates pulse current, namely, the operation is started. The 24V voltage can generate high voltage of hundreds of volts after being boosted, and the transmitting transducer is driven to work to transmit ultrasonic signals.
Referring to fig. 4, the echo preprocessing circuit mainly functions to simply process the ultrasonic echo, and the receiving transducer receives the echo signal, which is simply filtered by the capacitors C3 and C4. The diodes D3 and D4 are used for clamping the echo signal at 0.7V, and the mV echo signal can directly enter the subsequent circuit. The transistor Q2 is used to power amplify the echo signal.
Referring to fig. 5, the band-pass filter circuit is negative feedback second-order active band-pass filter and has a good filtering effect. Since the system needs to process the echo signal, the parameters of the filter circuit need to be designed, C7＝C8＝C0，ReqIs R12And R13The parallel value of (c).
Claims (2)
1. The utility model provides a transformer winding ultrasonic wave array on-line measuring device with decay compensation module which characterized in that: the n ultrasonic high-voltage driving circuit channels are respectively and electrically connected with the respective 400k transmitting transducers, the n 400k receiving transducers are electrically connected with the respective echo signal preprocessing circuit channels, and the echo signal preprocessing circuit channels are respectively and electrically connected with the respective attenuation compensation modules.
2. The on-line detection device of the transformer winding ultrasonic array with the attenuation compensation module according to claim 1, characterized in that: the attenuation compensation module structure is as follows: the band-pass filter is connected in series with the time gain amplifier, the low-pass filter and the A/D converter, and the D/A converter is electrically connected with the time gain amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922489200.9U CN211697657U (en) | 2019-12-31 | 2019-12-31 | Transformer winding ultrasonic array online detection device with attenuation compensation module |
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| CN201922489200.9U CN211697657U (en) | 2019-12-31 | 2019-12-31 | Transformer winding ultrasonic array online detection device with attenuation compensation module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079042A (en) * | 2022-03-10 | 2022-09-20 | 重庆科创职业学院 | Sound wave-based transformer turn-to-turn short circuit detection and positioning method and device |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079042A (en) * | 2022-03-10 | 2022-09-20 | 重庆科创职业学院 | Sound wave-based transformer turn-to-turn short circuit detection and positioning method and device |
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