KR101171857B1 - detecting internal cracks of transformer - Google Patents
detecting internal cracks of transformer Download PDFInfo
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- KR101171857B1 KR101171857B1 KR1020100128114A KR20100128114A KR101171857B1 KR 101171857 B1 KR101171857 B1 KR 101171857B1 KR 1020100128114 A KR1020100128114 A KR 1020100128114A KR 20100128114 A KR20100128114 A KR 20100128114A KR 101171857 B1 KR101171857 B1 KR 101171857B1
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- signal
- partial discharge
- transformer
- sensor unit
- acoustic signal
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Abstract
The present invention relates to a device for measuring internal defects of a transformer which detects an electrical signal and an acoustic signal accompanying an internal defect at the same time and accurately detects an internal defect and a location of the internal defect. A main sensor unit attached to an outer side of the housing, the main sensor unit analyzing a signal by measuring an acoustic signal accompanying partial discharge using a piezoelectric element and a sudden electric potential change occurring when partial discharge occurs, and attached to an outer side of the housing; And a plurality of sub-sensor units for detecting and supplying an acoustic signal to the main sensor unit when the partial discharge occurs, wherein the piezoelectric element is used in the form of electrodes attached to both sides of the dielectric.
Description
The present invention relates to a transformer, and in particular, the internal defect measurement of the transformer to detect the electrical and acoustic signals accompanying the internal defect at the same time to accurately detect the internal defect and the location of the defect inside Relates to a device.
In general, with the increase in power demand, transformers are getting larger and ultra-high pressure, and substations are becoming unmanned. When an accident occurs in such a large-capacity transformer, its ripple effect is widespread, economic loss and psychological anxiety are enormous, and the need for insulation diagnosis to prevent the accident of the transformer is increasing.
Recently, in order to secure the reliability of the transformer and to supply the power stably, a constant monitoring device has been developed for measuring abnormal symptoms, which are the occurrence of an accident, in the operation state of the transformer at all times. Development of a preventive diagnostic system to stop the operation and take countermeasures when abnormal symptoms progress and determine the type of abnormality based on the correlation between the abnormal detection data and determine the type of abnormality. It is becoming.
In general, the transformer has a structure as shown in Figure 1 to transform the voltage to be used in power demand, such as factories and homes, for smooth power transmission and distribution. That is, FIG. 1 is a view showing the appearance and circuit of a general transformer.
As shown in FIG. 1, a transcoil consisting of a primary coil and a secondary coil and a magnetic field core for smooth mutual induction of the transcoil, and a housing accommodating the mutually defective transcoil and the magnetic field core are configured. do.
The housing is filled with an insulating insulating cooling oil (hereinafter referred to as 'insulating oil') to cool the heat generated in the transformation process, most of these insulating oils are petroleum-based, but some of them as non-combustible synthetic insulating oil, According to the present invention, the properties are various, and in general, they have high volumetric electrical resistance, low viscosity, and are stable to oxidation.
However, these transformers are frequently caused by thermal deterioration due to high temperature operation, thermal deterioration due to external short-circuit, mechanical damage and discharge deterioration due to partial discharge, resulting in mechanical breakdown, increased vibration, and flammable gas. Progress.
Therefore, the insulation breakdown of the transformer due to overheating has caused many problems such as explosion of the transformer and power failure.
In order to minimize the conventional failure of the transformer, on-line abnormality detection technology applied to the constant monitoring of the transformer includes a gas analysis technology, partial discharge measurement technology, temperature measurement technology and the like of the transformer insulating oil.
Here, partial discharge continuously degrades the insulation inside the transformer, resulting in a transformer insulation accident.
The internal defects in the transformers according to the prior art are measured using piezoelectric elements and acoustic signals using capacitive sensors when partial discharge occurs due to internal defects.
However, when the acoustic signal is detected by using a piezoelectric element to measure the internal defect of the transformer according to the prior art, the position estimation is difficult when the signal is detected only in one or two sensors among a large number of attached sensors. Very difficult.
In addition, when a piezoelectric element and a capacitive sensor are installed in a transformer to detect an acoustic signal and an electrical signal in a complex manner, when an internal defect occurs inside the transformer, the electrical signal is immediately detected by the light beam and the acoustic signal is weak in oil. 340 [m / s] can be used to help determine the exact location of the partial discharge because it can confirm the point of occurrence of partial discharge.However, when the piezoelectric element, the capacitive sensor, and the detection device are separately installed, the cost increases. Not suitable for low cost transformers.
The present invention is to solve the above problems and to detect the electrical and acoustic signals accompanying the internal defects at the same time at the same time to detect the internal defects and the location of the internal defects of the transformer accurately Its purpose is to provide an internal defect measuring apparatus.
An apparatus for measuring internal defects of a transformer according to the present invention for achieving the above object includes a housing constituting a transformer and an acoustic signal accompanying partial discharge using a piezoelectric element attached to an outer side of the housing and a sudden occurrence of partial discharge. And a plurality of sub sensor units attached to an outer side of the housing to detect an electric potential change and detect a sound signal when a partial discharge occurs, and supply the acoustic signal to the main sensor unit. Is characterized in that it is used in the form of the electrode attached to both sides of the dielectric.
The internal defect measuring apparatus of the transformer according to the present invention has the following effects.
First, by attaching a piezoelectric element for measuring electrical signals and acoustic signals simultaneously on the outer surface of the transformer, it is possible to accurately detect the internal defect and the position of the defect by estimating the position of the partial discharge source when the partial discharge occurs inside the transformer.
Second, the piezoelectric element is formed by attaching electrodes to both sides of the dielectric, and an amplifier capable of amplifying an acoustic band signal when a partial discharge occurs due to an internal defect in a transformer, and an electrical signal having a sudden transient voltage type. By connecting the amplifiers in parallel, low-cost transformers can be installed by measuring electrical signals, including acoustic signals, in place of capacitive sensors.
Third, to set the point of time of the detected electrical signal as the origin of signal generation from the defect, calculate the time from the detection of the delayed signal to the delay time, calculate the distance from the sensor, and use only the normal acoustic signal as the location of the defect. The position can be analyzed more accurately.
Fourth, the acoustic signal is generally attenuated inside the transformer, so it is very difficult to estimate the position if only a small number of sensors attached to the sensor are detected. The location where this occurred can be estimated accurately.
1 is a view showing the appearance and circuit of a typical transformer
2 is a schematic view showing an internal defect measuring apparatus of a transformer according to the present invention
3 is a schematic view showing the inside of the internal defect measuring apparatus of FIG.
Figure 4 is a waveform diagram showing the waveform of the electrical and acoustic signals detected through the internal defect measuring device of the transformer according to the present invention
Hereinafter, an internal defect measuring apparatus of a transformer according to the present invention will be described in detail with reference to the accompanying drawings.
Figure 2 is a schematic diagram showing the internal defect measuring apparatus of the transformer according to the present invention, Figure 3 is a schematic diagram showing the interior of the internal defect measuring apparatus of FIG.
As shown in FIGS. 2 and 3, the apparatus for measuring internal defects of a transformer according to the present invention includes a
The
Here, the
The amplifying circuit for amplifying the sound signal of the amplifying
An amplifying circuit for amplifying an electric signal among the amplifying
It is configured to include a
The
In general, for electric signals, the frequency band of the filter is about 1 to 300 MHz, and for acoustic signals it is about 50 to 300 kHz.
The plurality of
Figure 4 is a waveform diagram showing the waveform of the electrical signal and the acoustic signal detected by the internal defect measuring device of the transformer according to the present invention.
As shown in Fig. 4, in the case of detecting a signal in a complex manner, when an internal defect occurs inside the transformer, the electric signal is immediately detected by the sensor at the speed of light, but the acoustic signal is measured at the speed of about 340 [m / s] in water. Since there is a time delay compared to the transmitted electric signal, the distance from the sensor is calculated by setting the time point of the detected electric signal as the origin of signal generation from the defect and calculating the time until the acoustic signal is detected as the delay time. The position of can be analyzed much more accurately than the method using only general acoustic signal.
In addition, the acoustic signal is generally attenuated inside the transformer, so it is very difficult to estimate the position when only a small number of sensors attached to the sensor are detected. Can be detected more accurately.
The internal defect measuring apparatus of a transformer according to the present invention configured as described above includes a
That is, the
Finally, the analog signal passed through the
The result can be confirmed through the
The number of the
Power required for the
On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention It will be apparent to those skilled in the art.
110: transformer housing 120: main sensor unit
130: sub sensor unit 140: monitoring device
Claims (6)
A piezoelectric element attached to the housing and simultaneously detecting an acoustic signal and an electrical signal when a partial discharge occurs in the transformer;
A main sensor unit including the piezoelectric element and measuring an acoustic signal detected from the piezoelectric element and an abrupt electric potential change generated when partial discharge occurs, and analyzing the electrical signal;
Is attached to the outside of the housing and comprises a plurality of sub-sensor unit for detecting and supplying an acoustic signal to the main sensor unit when a partial discharge occurs,
The piezoelectric element is an internal defect measuring apparatus of a transformer, characterized in that used in the form of electrodes attached to both sides of the dielectric.
An amplifying circuit for amplifying the acoustic signal and the electrical signal detected from the piezoelectric element, respectively;
A frequency filter for filtering the frequencies of the high frequency signals of the sound signal and the electrical signal amplified by the amplifying circuit, respectively;
A first A / D converter for converting the acoustic signal and the electrical signal filtered from the frequency filter into digital signals, respectively;
A microprocessor which receives the acoustic signal and the electrical signal converted into the digital signal from the first A / D converter, analyzes the factor of each signal, determines whether the actual partial discharge is performed, and finally determines the position of the partial discharge;
A communication module for transmitting the position of the partial discharge determined from the microprocessor to the outside;
A display unit for displaying the position of the partial discharge determined from the microprocessor;
A second A / D converter for receiving the acoustic signals measured from the plurality of sub-sensor units and converting them into digital signals, and a power supply unit for supplying power to each component. Device.
A plurality of piezoelectric elements attached to the housing through a wear plate to detect an acoustic signal when a partial discharge occurs in the transformer;
An amplifying circuit for amplifying an acoustic signal detected from each piezoelectric element;
And a frequency filter for filtering a signal other than a required frequency band among the sound signals amplified by the amplifying circuit, and transmitting the sound signal filtered from the frequency filter to the second A / D converter of the main sensor unit. Measuring device for internal defects in the transformer.
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KR1020100128114A KR101171857B1 (en) | 2010-12-15 | 2010-12-15 | detecting internal cracks of transformer |
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KR1020100128114A KR101171857B1 (en) | 2010-12-15 | 2010-12-15 | detecting internal cracks of transformer |
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KR101171857B1 true KR101171857B1 (en) | 2012-08-07 |
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KR101327998B1 (en) * | 2012-11-13 | 2013-11-13 | 주식회사 효성 | Apparatus for partial discharge detectin to transformer and transformer having the same |
KR101483209B1 (en) * | 2013-06-25 | 2015-01-22 | 한빛이디에스(주) | Advanced Transformer Deterioration Diagnosis System Based on AE sensor with New Piezoelectric material |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002131366A (en) | 2000-10-20 | 2002-05-09 | Toshiba Corp | Internal partial discharge monitoring device for high voltage apparatus |
JP2007292700A (en) * | 2006-04-27 | 2007-11-08 | Toshiba Corp | Partial discharge position specifying method of stationary induction apparatus |
KR100826630B1 (en) * | 2006-12-18 | 2008-05-02 | 한국전기연구원 | Apparatus for measuring electromagnetic and acoustic wave using one body hybrid sensors and method thereof |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002131366A (en) | 2000-10-20 | 2002-05-09 | Toshiba Corp | Internal partial discharge monitoring device for high voltage apparatus |
JP2007292700A (en) * | 2006-04-27 | 2007-11-08 | Toshiba Corp | Partial discharge position specifying method of stationary induction apparatus |
KR100826630B1 (en) * | 2006-12-18 | 2008-05-02 | 한국전기연구원 | Apparatus for measuring electromagnetic and acoustic wave using one body hybrid sensors and method thereof |
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