KR101050870B1 - Ultrasonic Transformer Diagnostic System - Google Patents

Abstract

The present invention relates to a transformer diagnostic system using ultrasonic waves, which is detachably mounted on an outer wall of a transformer, and detects an analog ultrasonic signal emitted from the transformer, and an analog ultrasonic signal detected from the ultrasonic sensor. Ultrasonic receiving device that receives received and converts into digital ultrasonic signal through frequency filtering and digital signal processing of specific band, and receives the digital ultrasonic signal converted from the ultrasonic receiving device and compares and analyzes it with the ultrasonic signal pattern for each transformer abnormal type. By including a transformer diagnostic device for determining the type of abnormality of the transformer, it is possible to easily diagnose the failure of the transformer in advance by mobile, it is possible to reduce the cost of transformer replacement and repair by preventing the transformer failure in advance. .

Ultrasonics, transformers, acoustic emission sensors, ultrasonic receivers, transformer diagnostics, filtering

Description

Transformer diagnostic system using ultrasonic wave {SYSTEM FOR DIAGNOSTICATION OF TRANSFORMER USING ULTRASONIC WAVE}

The present invention relates to a transformer diagnostic system using ultrasonic waves, and more particularly, by detecting and analyzing abnormalities such as partial discharges or internal defects of a transformer using ultrasonic waves, and easily diagnosing whether a transformer is defective. In addition, the present invention relates to a portable transformer diagnosis system using ultrasonic waves, which can reduce the cost of replacing and repairing a transformer as much as possible by preventing a transformer failure in advance.

In general, electric power generated from hydroelectric power, thermal power, or a nuclear power plant is transferred to the final consumer side of a home, office, factory, etc., and reaches the final consumer side via a substation and a transformer in an intermediate stage.

The power generated at the power plant is typically supplied to the substation at a high pressure of 154 KV or 345 KV, which is then lowered back to a high voltage of typically 22.9 KV and supplied to the transformer just before the final customer side, where the It is converted to a voltage of 110V or 220V, which is a voltage suitable for use by the end customer side, and is supplied to the final customer side.

Such a transformer includes a residential transformer installed in a pole and a transformer for underground distribution lines installed on the ground. Among these, the columnar transformer is relatively small in capacity, and thus is relatively small and light in weight, and is usually installed in a pole and the like to lower the high pressure from the substation to low pressure and supply it to the final customer side.

However, in crowded metropolitan areas, it is very dangerous to drag high voltage (22.9 KV) distribution lines from substations through electric poles in congested urban areas. It is a situation where electric power is supplied to the final consumer side through a transformer installed on the ground, that is, a ground transformer, while dragging the (distribution line).

These ground transformers are currently being replaced in a total of about 13 years based on the process transformer replacement standard due to the absence of a separate measuring method for old age and defects in the current state. It is true.

In addition, the underground area has more unstable load characteristics because there are more commercial areas and some industrial districts than housing loads, and thus the frequency of failure due to ground transformer failure is high.In particular, failure due to a transformer failure spreads to high voltage failure as well as low voltage failure. The company's supply reliability is deteriorating as well as the company's image.

There is no proper technology that can extract these phenomena in advance and prevent transformer failure.

The present invention has been made to solve the above-described problems, the object of the present invention is to easily detect the failure of the transformer by detecting the presence of abnormalities such as partial discharge or internal defects of the transformer using ultrasonic waves, and analyzing and diagnosing them. The present invention provides a mobile transformer diagnosis system using ultrasonic waves, which can diagnose and minimize the cost of replacing and repairing a transformer.

In order to achieve the above object, an aspect of the present invention, an ultrasonic sensor for detachably mounted on the outer wall of the transformer, for detecting the analog ultrasonic signal emitted from the transformer; An ultrasonic receiver receiving the analog ultrasonic signal detected by the ultrasonic sensor and converting the ultrasonic ultrasonic signal into a digital ultrasonic signal through frequency filtering and digital signal processing of a specific band; And a transformer diagnostic apparatus for receiving the digital ultrasonic signal converted from the ultrasonic receiving apparatus and comparing the result with a preset ultrasonic signal pattern for each transformer fault type to determine a fault type of the transformer. will be.

Here, the ultrasonic sensing unit is preferably made of at least one acoustic emission (AE) sensor.

Preferably, the ultrasonic sensor may be detachably attached to the outer wall of the transformer using a magnetic material.

Preferably, the ultrasonic receiver, the filter unit for receiving the analog ultrasonic signal detected by the ultrasonic sensor for filtering the noise and the ultrasonic signal corresponding to the selected frequency band; An amplifier for amplifying the ultrasonic signal filtered from the filter unit; A signal processor which analyzes the ultrasonic signal amplified by the amplifier and processes the ultrasonic signal into a digital signal; A display unit which displays the digital ultrasonic signal processed by the signal processor as a predetermined waveform; And a memory unit for storing the digital ultrasonic signal processed by the signal processor in the form of data.

Preferably, the ultrasonic receiver may further include an audio output unit for outputting the analog ultrasonic signal detected by the ultrasonic sensing unit as a specific sound so that a user can visually confirm.

Preferably, the basic value is adjusted according to the sensitivity change of the ultrasonic sensing unit so as to be connected between the ultrasonic sensing unit and the ultrasonic receiving unit to generate a predetermined ultrasonic signal so that the sensitivity of the ultrasonic sensing unit can be kept constant. And an ultrasound calibration apparatus for diagnosing whether the ultrasonic sensor and the ultrasonic receiver are normally operated.

Preferably, the transformer diagnostic apparatus may control to output a graphic representation or sound by time-phase and fast Fourier transform (FFT) for the digital ultrasonic signal converted from the ultrasonic receiver.

Preferably, the transformer diagnostic apparatus may determine an abnormal type of the transformer by analyzing the magnitude of the currently received ultrasonic signal and the type of the waveform.

Preferably, the transformer diagnostic apparatus may further include a function of comparing and analyzing a currently received ultrasound signal with previously stored historical data.

Preferably, the transformer fault type may include at least one of a chemical fault, a loose component, and a partial discharge (PD).

According to the transformer diagnosis system using the ultrasonic wave as described above, by detecting the abnormality of the partial discharge or internal defect of the transformer using the ultrasonic wave, and analyzing and diagnosing the abnormality, the transformer can be easily diagnosed in advance. In addition, it is possible to reduce the cost of replacing and repairing the transformer as much as possible by preventing the transformer failure in advance, as well as to effectively improve the power supply reliability by preventing the power failure and to improve the write image by minimizing the customer of the power failure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention illustrated below may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

1 is an overall conceptual diagram for explaining a transformer diagnostic system using ultrasonic waves according to an embodiment of the present invention, Figure 2 is a block diagram illustrating an overall transformer diagnostic system using ultrasonic waves according to an embodiment of the present invention. to be.

1 and 2, a transformer diagnosis system using ultrasonic waves according to an embodiment of the present invention includes an ultrasonic detector 100, an ultrasonic receiver 200, and a transformer diagnostic apparatus 300. It is made, including.

Here, the ultrasonic sensing unit 100 is detachably mounted on the outer wall of the transformer T in order to detect an abnormal signal (for example, partial discharge or internal defect, etc.) of the transformer T, and in the transformer T It performs the function of detecting the emitted analog ultrasonic signal. In addition, the ultrasonic sensing unit 100 is connected to the ultrasonic receiving apparatus 200 through a conventional cable (cable) and delivers the detected ultrasonic signal.

The ultrasonic sensing unit 100 is preferably made of at least one Acoustic Emission (AE) sensor, and may be detachably attached and contacted to the outer wall of the transformer T by using a predetermined magnetic material.

On the other hand, the acoustic emission (AE) sensor may be of the attached or contact type, the attached acoustic emission (AE) sensor detects the ultrasonic signal according to the partial discharge or internal defect of the transformer (T), The ultrasonic signal detection frequency range is about 20 kHz to 100 kHz, and a device that can be firmly fixed to the transformer (T) body to receive the ultrasonic signal by separating the ambient noise is also built in the ultrasonic receiver 200 Predetermined slots may be attached to which the ultrasonic signals may be transmitted.

In addition, the contact acoustic emission (AE) sensor detects an ultrasonic signal according to a partial discharge or an internal defect of the transformer T, and the ultrasonic signal detection frequency range is about 20 kHz to 100 kHz, and the attached acoustic In a field situation where an emission (AE) sensor cannot be used, a transformer (T) contact device (eg, a magnetic material, etc.) is built in to effectively detect an abnormal signal of the transformer (T) and is connected to the ultrasonic receiver 200. A predetermined slot may be attached to transmit the ultrasonic signal.

On the other hand, the ultrasonic detection principle in the present invention mixes the incident radio wave and the output of the oscillator prepared separately to make a bit frequency, and the detection method (aka "heterodyne" method) to draw the signal by applying the bit frequency to the detector It is preferable to apply a method of converting the signal detected by the reference) into an audible band and recording it.

In addition, the ultrasonic receiver 200 receives the analog ultrasonic signal detected by the ultrasonic sensor 100 and converts the digital ultrasonic signal into a digital ultrasonic signal through frequency filtering and digital signal processing of a specific band (for example, about 20 kHz to 100 kHz). It performs the function.

The ultrasonic receiver 200 basically receives an analog ultrasonic signal detected from the ultrasonic sensor 100 and converts the ultrasonic ultrasonic wave into an ultrasonic signal corresponding to a noise and a selected frequency band (for example, about 20 kHz to 100 kHz). The filter unit 210 to filter, the amplification unit 220 to amplify the ultrasonic signal filtered from the filter unit 210, and the ultrasonic signal amplified from the amplification unit 220 to analyze and process the digital signal The signal processor 230, the display unit 240 for displaying the digital ultrasonic signal processed by the signal processor 230 as a predetermined waveform, and the digital ultrasonic signal processed by the signal processor 230 in the form of data It may include a memory unit 250 to be stored as.

In addition, the ultrasound receiver 200 may further include an audio output unit 260 that outputs a specific sound through the signal processor 230 so that a user may visually check the ultrasound signal detected by the ultrasound sensor 100. It may include.

In addition, the ultrasonic receiver 200 may perform a frequency correction function in a frequency band of about 20 kHz to 100 kHz to enable effective collection of the ultrasonic signal emitted from the transformer T.

In addition, the ultrasonic receiving apparatus 200 may adjust the sensitivity of the ultrasonic sensing unit 100 and display a digital value and a graph to immediately measure the intensity of the ultrasonic signal detected by the ultrasonic sensing unit 100. It can also be done.

In addition, the ultrasound receiver 200 may be implemented to be portable to facilitate movement diagnosis, and further include a connection terminal to alternately connect the acoustic emission (AE) sensor according to the detection state of the ultrasonic signal. In addition, a fan device may be incorporated to prevent malfunction of the device due to internal heat.

Further, although not shown in the drawings, the ultrasonic receiver 200 may include a receiving circuit, an amplifier circuit, a filter circuit, an arithmetic unit, a battery, and the like therein. In order to adjust the function and to connect with other devices, the front panel of the display panel, the power switch to control the operation of the device (ON / OFF), and detects the ambient brightness CDS (cadmium sulfide cell), a light receiving element for automatically adjusting the brightness of the terminal, a terminal for data transmission with a computer, an ultrasonic input terminal connected with the ultrasonic sensor 100 to receive an ultrasonic signal, A slot into which a memory device such as a memory card can be inserted, a volume control switch for adjusting a volume of a speaker, an earphone connection terminal for connecting an earphone, and a battery charging inside the ultrasonic receiver 200. Charging terminals for the input, external input terminals (AUX), rotary switches for selecting menus and detailed settings, confirmation switches for saving selected menus and detailed settings, etc. It may be included.

In addition, the transformer diagnostic apparatus 300 receives the digital ultrasonic signal converted from the ultrasonic receiving apparatus 200 and compares the result with a preset ultrasonic signal pattern for each transformer fault type to determine a fault type of the transformer T. do.

The transformer diagnostic apparatus 300 is preferably implemented as a notebook computer so as to be movable, but is not limited thereto. For example, the operation and signal of a desktop computer, a personal digital assistant (PDA), and the like may be used. Any electronic / communication terminal having functions such as processing and display can be implemented.

In addition, the transformer diagnostic apparatus 300 outputs a graphic representation or sound by time series (time series-time / size) and fast Fourier transform (FFT) on the digital ultrasonic signal converted from the ultrasonic receiver 200. Can be controlled.

In addition, the transformer diagnostic apparatus 300 may determine an abnormal type of the transformer T by analyzing the magnitude and waveform type of the ultrasonic signal currently received from the ultrasonic receiver 200, and the abnormal signal of the transformer T. In case of occurrence, it is possible to analyze the abnormal type of the transformer (T) by analyzing the frequency of about 60Hz cycle.

In addition, the transformer diagnostic apparatus 300 may compare and analyze the ultrasound signal currently received from the ultrasound receiver 200 with previously stored historical data.

On the other hand, the transformer fault type is, for example, chemical failure (Arcing: insulation failure due to impurities in insulating oil, etc.), mechanical failure (Loose Component: vibration due to relaxation of the internal bolt, etc.) or electrical failure (Partial Discharge: Deterioration of the coil, poor arrangement of the windings, poor phase separation, poor bus bar, etc.).

In addition, the ultrasonic sensor 100 is connected between the ultrasonic receiver 100 and the ultrasonic receiver 200 so as to generate a predetermined ultrasonic signal so that the sensitivity of the ultrasonic sensor 100 can be kept constant. An ultrasound calibration apparatus 400 for performing basic value adjustment (zero point correction) according to the sensitivity change and diagnosing the normal operation of the ultrasonic detector 100 and the ultrasonic receiver 200 may be further included.

On the other hand, in one embodiment of the present invention, but the connection between the ultrasonic sensing unit 100, the ultrasonic receiving device 200 and the transformer diagnostic apparatus 300 by wire through a cable, but is not limited to this, between each component It can also be configured to enable wired / wireless communication.

Although a preferred embodiment of a transformer diagnosis system using ultrasonic waves according to the present invention has been described above, the present invention is not limited thereto, and various modifications are made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to implement and this also belongs to the present invention.

1 is an overall conceptual diagram illustrating a transformer diagnosis system using ultrasonic waves according to an embodiment of the present invention.

2 is a block diagram illustrating an overall transformer diagnosis system using ultrasonic waves according to an embodiment of the present invention.

Claims (10)

An ultrasonic sensor detachably mounted on an outer wall of the transformer and detecting an analog ultrasonic signal emitted from the transformer; An ultrasonic receiver receiving the analog ultrasonic signal detected by the ultrasonic sensor and converting the ultrasonic ultrasonic signal into a digital ultrasonic signal through frequency filtering and digital signal processing of a specific band; It is connected between the ultrasonic sensor and the ultrasonic receiver, and generates a ultrasonic signal of a predetermined value to adjust the default value (zero point correction) according to the sensitivity change of the ultrasonic sensor to maintain a constant sensitivity of the ultrasonic sensor. An ultrasound calibration apparatus configured to diagnose whether the ultrasonic detector and the ultrasonic receiver operate normally; And And a transformer diagnosis device that receives the digital ultrasonic signal converted from the ultrasonic receiver and compares and compares the digital ultrasonic signal with a preset ultrasonic signal pattern for each transformer fault type to determine a fault type of the transformer. The method according to claim 1, The ultrasonic detection unit is a transformer diagnostic system using ultrasonic waves, characterized in that made of at least one acoustic emission (AE) sensor. The method according to claim 1, The ultrasonic detection unit is a transformer diagnostic system using ultrasonic waves, characterized in that detachably attached to the outer wall of the transformer using a magnetic material. The method according to claim 1, The ultrasonic receiver, A filter unit which receives the analog ultrasonic signal detected by the ultrasonic detector and filters the noise and the ultrasonic signal corresponding to the selected frequency band; An amplifier for amplifying the ultrasonic signal filtered from the filter unit; A signal processor which analyzes the ultrasonic signal amplified by the amplifier and processes the ultrasonic signal into a digital signal; A display unit which displays the digital ultrasonic signal processed by the signal processor as a predetermined waveform; And And a memory unit for storing the digital ultrasonic signal processed by the signal processor in data form. 5. The method of claim 4, The ultrasonic receiver, And a sound output unit for outputting a specific sound so that the user can audibly check the analog ultrasonic signal detected by the ultrasonic sensing unit. delete The method according to claim 1, The transformer diagnostic device, The transformer diagnostic system using ultrasonic waves, characterized in that to control the graphic representation or sound output by time zone and fast Fourier transform (FFT) for the digital ultrasonic signal converted from the ultrasonic receiver. The method according to claim 1, The transformer diagnostic device, A transformer diagnostic system using ultrasonic waves, characterized in that the abnormality type of the transformer is determined by analyzing the magnitude and waveform type of the currently received ultrasonic signal. The method according to claim 1, The transformer diagnostic device, And a function of comparing and analyzing the currently received ultrasound signal with previously stored historical data. The method according to claim 1, The transformer fault type is a transformer diagnosis system using ultrasonic waves, characterized in that any one of a chemical defect (Arcing), a mechanical component (Loose Component), or an electrical failure (Partial Discharge, PD).

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