KR101150500B1 - Device and method for detecting corona - Google Patents

Abstract

The present invention relates to a corona detecting apparatus and method, and more particularly, to a corona detecting apparatus and method capable of detecting the degree of abnormality of a power facility by displaying a degree of corona discharge by detecting a corona discharge. A corona detecting apparatus according to an embodiment of the present invention includes a sensing unit using at least two sensors and sensing a corona discharge generated in a power facility, A signal processing unit for converting the sensing signal into a voltage signal, and a control unit for determining an abnormality degree of the electric power facility using the converted voltage signal. The present invention can accurately determine the degree of abnormality of the electric power facility by displaying the degree of corona discharge by detecting the corona discharge and can determine the abnormality of the electric power facility without any special skill, It can carry out inspection for a wide range of facilities in a short time, so there are few operational constraints.

Description

TECHNICAL FIELD [0001] The present invention relates to a corona detection apparatus,

The present invention relates to a corona detecting apparatus and method, and more particularly, to a portable corona detecting apparatus and method capable of detecting an abnormality of a power facility by displaying a degree of corona discharge by detecting corona discharges.

In recent years, with the rapid development of industry, various power devices have been made into high-voltage and large capacity, and efforts have been made to improve the stability and reliability of the power system in order to supply high-quality power.

However, due to defects caused by poor manufacturing and installation of transmission and distribution lines, insulators, various connection points and electric power facilities, and deterioration due to environmental conditions such as salt and temperature and humidity, large power outages caused by arc discharge, short circuit, It is occurring both domestically and internationally.

Generally, accidents such as arc discharge, short circuit and ground fault of high voltage and above electric power equipment occur due to breakdown of the insulation condition that reaches the breakdown voltage. In addition to accidents caused by sudden mechanical or physical causes, product defects, The corona discharge phenomenon at the point of time when the breakdown voltage exceeds the threshold voltage in the air may be preceded. Here, the corona discharge phenomenon is a phenomenon in which the insulating property of air adjacent to a live part and an insulator of a power facility such as a line, an insulator and the like with a high voltage or higher is partially destroyed to generate light and noise.

Therefore, if the corona discharge can be accurately measured in the transmission / distribution line, the insulator, various connection points, and the electric power facility, it is possible to prevent an accident that may occur in various electric power facilities.

Conventionally, techniques for measuring corona discharge include high frequency, ultrasonic, thermal imaging equipment, acoustic wave detection, and visual inspection.

However, these conventional methods have problems in that the price of the equipment is high, the accuracy of detection is low due to a considerable number of factors that can cause errors due to the busy signal due to weather, day / night use restriction, and surrounding environment (traffic volume and congestion).

In addition, the semiconductor sensor used for measuring the corona discharge has a poor sensitivity, so that a desired detection distance can not be obtained. In addition, a UV-tron sensor generates a measurement error due to a background discharge, There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a corona detecting apparatus and method that can accurately detect an abnormality of a power facility by displaying a corona discharging degree by detecting a corona discharge.

In addition, the present invention can determine whether there is an abnormality in the electric power facility without any special skill, and it is possible to carry out the inspection for a wide range of facilities in a short time, And more particularly, to an apparatus and method for detecting a small amount of corona.

The present invention also relates to a corona detection apparatus and method for preventing errors in measured values due to occurrence of a background discharge, which is an inherent defect of a sensor.

According to one aspect of the present invention, a corona detecting apparatus is provided.

A corona detecting apparatus according to an embodiment of the present invention includes a sensing unit using at least two sensors and sensing a corona discharge generated in a power facility, A signal processing unit for converting the sensing signal into a voltage signal, and a control unit for determining an abnormality degree of the electric power facility using the converted voltage signal.

According to another aspect of the present invention, a corona detection method is provided.

A method of detecting a corona according to an embodiment of the present invention includes the steps of: aiming a corona detecting device on a power equipment to be inspected in a corona detecting device and sensing a corona discharge generated in the power equipment; And converting the sensed signal into a voltage value, and determining an abnormality degree of the electric power facility using the converted voltage value.

The present invention can accurately determine the degree of abnormality of electric power facilities by displaying the degree of corona discharge by detecting corona light and displaying the degree of corona discharge.

In addition, the present invention can determine whether there is an abnormality in the electric power facility without any special skill, and it is possible to carry out the inspection for a wide range of facilities in a short time, little.

In addition, the present invention prevents errors in measurement values due to background discharge, which is an inherent defect of the sensor.

1 is a block diagram of a corona detecting apparatus according to an embodiment of the present invention;
2 and 3 are views for explaining a part of a corona detecting apparatus according to an embodiment of the present invention in more detail;
4 is a flowchart for explaining a corona detection method according to an embodiment of the present invention;
5 is a view for explaining an external configuration of a corona detecting device according to an embodiment of the present invention;

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a corona detecting apparatus according to an embodiment of the present invention.

1, the corona detecting apparatus 100 includes a sensing unit 110, a signal processing unit 120, a control unit 130, a power supply unit 140, an input unit 150, an output unit 160, 170).

The sensing unit 110 senses a corona discharge generated in the electric power facility. Here, the electric power facility may be a transmission / distribution line, a connection point of the electric power facility, or an agile of the transmission / distribution electric power facility.

As described above, the corona light may be a frequency region between 180 nm and 260 nm, which is the light partially destroyed by the insulation of the live portion of the electric power equipment and the insulator adjacent to the high voltage or higher.

Accordingly, the sensing unit 110 selectively passes light in a frequency range of 180 nm to 260 nm to measure a discharge through a sensor.

The sensing unit 110 can measure the discharge by counting the number of photoelectrons generated through the photoelectric effect due to the sensed light.

The sensing unit 110 may supply power to each of the two sensors and measure only the corona discharges simultaneously measured by the two sensors to minimize the influence of the background discharge of the sensor. Here, the background discharge is a defect inherent in the UV-Tron. Although the cause of the background discharge is not clarified yet, it is observed that an average of about 1 time occurs within 1000 seconds and a retention time occurs within 0.2 seconds. When measuring the corona discharge, errors are often occurring.

The signal processing unit 120 converts the sensed discharge into a voltage value. Here, the voltage value may be an integer.

The signal processing unit 120 determines that the detection signal is valid only when the signals from the two sensors arrive at the same light source simultaneously with respect to the corona discharge measured by the two sensors so that the influence of the background discharge unique to the sensor can be minimized have.

The control unit 130 determines the degree of abnormality of the electric power facility using the converted voltage value.

The control unit 130 compares the calculated voltage value with at least one preset reference voltage value to determine an abnormality of the electric power facility.

The control unit 130 controls the output unit 160 to output the degree of abnormality of the power equipment to the output unit 160 as a video or an audio signal.

In addition, when an input signal for measurement is input, the controller 130 detects the voltage of the sensing unit 110 and adjusts a voltage supplied to the sensor unit 110 to measure a corona discharge generated in the power facility.

The power unit 140 senses the amount of power of the battery 142 and the charging unit 144 to charge the battery using the battery 142 and the external power source. When the power amount is below the threshold value, And a power monitor and control unit 146 for generating a power monitor.

The power supply unit 140 allows the corona detecting device 100 to be used for portable purposes, and there is no operational limitation.

The battery 142 can use a rated voltage of 12 V, for example, by connecting a 640 mAh 3Cell in series with a lithium polymer battery, and the remaining amount indication can be displayed on the output unit 160 as a percentage (%).

The input unit 150 receives a control signal for operating the corona detecting device.

The output unit 160 may include a video output unit 162 for indicating the degree of abnormality of the electric power facility and an audio output unit 164 for outputting an audio signal such as an alarm.

The external device connection unit 170 connects an external device such as a sight scepter, such as a dot sight or a laser pointer, which can be identified by day or night.

Here, the sight mirror 172 can be attached to the external device connection part at the time of close-up inspection of the power equipment to detect an abnormal signal, and can accurately detect an abnormal part.

2 and 3 are views for explaining a part of the corona detecting apparatus according to an embodiment of the present invention in more detail.

2, the sensing unit 110 includes a first screening transmitting unit 111, a second screening transmitting unit 112, a first sensor unit 113, a second sensor unit 114, a voltage adjusting unit 115, An output waveform adjusting unit 116, and a voltage supply unit 117.

The first selective transmission portion 111 and the second selective transmission portion 112 protect the sensor from contaminants and selectively transmit ultraviolet rays generated in the corona. Here, the selectively transmitted ultraviolet region may be a UV-C region of 180 nm to 260 nm. This is because the ultraviolet rays emitted from the ultraviolet rays of the sun are mixed with infrared rays and can not accurately detect the corona light due to deterioration when the light of the band emitted from the corona is received.

The first sensor unit 113 and the second sensor unit 114 selectively discharge and transmit the corona light to be discharged by the photoelectric effect. The first sensor unit 113 and the second sensor unit 114 may be a UV-Tron sensor, which is not a conventional semiconductor sensor but a UV flame sensor. Here, the UV-Tron detector uses a discharge tube using an external photoelectric effect, and can be operated as a change in the amount of light received by a single ultraviolet ray or an out-of-gamut light source, and is sensitive to corona discharge.

In one embodiment of the present invention, the number of sensors is described as two for convenience, but the number of sensors may be two or more.

The voltage adjusting unit 115 can adjust the voltage supplied to the sensor in a programmable manner, and can adjust the voltage according to the voltage characteristic for each sensor. Here, the voltage supplied to the sensor can be adjusted in order to maintain the optimum sensitivity according to the sensor, and referring to the circuit of FIG. 3, it may be 230 +/- 10V.

The output waveform adjuster 116 adjusts the frequency and the duty to adjust the waveform of the output signal after the corona light is detected. Here, referring to the circuit of FIG. 3, the frequency and duty to be regulated may be 10 kHz and 1%.

The voltage supply unit 117 supplies a predetermined voltage to the first sensor unit 113 and the second sensor unit 114.

As shown in FIG. 3, the voltage supply unit 117 is provided with no voltage supply circuit for each sensor of the first sensor unit 113 and the second sensor unit 114, and is separated from one voltage supply circuit by a diode Voltage is supplied. This can prevent sudden voltage drop of other sensors when background discharge occurs inherent to the sensor.

The signal processing unit 120 includes a background discharge preventing unit 121, a signal converting unit 122, and a timer 123.

The background discharge preventing section 121 determines that the signals from the sensors of the first sensor section 113 and the second sensor section 114 are valid only when they reach the respective sensors simultaneously from the same light source.

As shown in FIG. 3, the background discharge preventing unit 121 includes a circuit that performs a function of a logic circuit AND so that signals from each of the first sensor unit 113 and the second sensor unit 114 are simultaneously input And outputs the detection signal as a detection signal. Here, the configuration of the circuit that performs the function of the logic circuit AND is obvious to those skilled in the art, and thus a detailed description thereof will be omitted.

Referring to FIG. 3, in the case of the UV-Tron sensor, background discharge occurs once in 1000 seconds and background discharge has an average retention time of 0.2 seconds in an experiment. Therefore, since the probability of the background discharge occurring simultaneously in N (two or more natural number) sensors is (0.2 / 1000) ^N , the more the number of sensors is, the more reliable the detection signal can be secured. Here, it is apparent to those skilled in the art that the number of sensors is limited to two but may be two or more in one embodiment of the present invention.

The signal converting unit 122 converts the frequency component (the number of pulses) of the sensing signal into a voltage signal through an F / V (Frequency / Voltage) converter.

The signal converting unit 122 converts an analog voltage signal to a digital voltage signal through an A / D converter via an F / V converter.

The timer 123 calculates the interval between the signal and the signal to calculate the frequency of detection of the corona discharge.

The control unit 130 determines the degree of abnormality of the electric power facility using the voltage signal converted into the digital signal, and may be a processor as shown in FIG.

4 is a flowchart illustrating a corona detection method according to an embodiment of the present invention.

Referring to FIG. 4, in step S410, the corona detecting apparatus 100 aims the corona detecting device at the electric power facility to be inspected and detects a corona discharge generated in the electric power facility. Here, the corona detecting apparatus 100 is designed to aim at a dot sight or a laser pointer sight to determine the precise position of a power facility where a corona discharge is generated, and to measure a corona discharge in a region of a frequency between 180 nm and 260 nm Discharge can be detected.

In step S420, the corona detecting apparatus 100 determines that the detection signals in the first sensor unit 113 and the second sensor unit 114 are valid signals only when they reach the respective sensors simultaneously from the same light source, Signal.

In step S430, the corona detecting device 100 converts the frequency signal (pulse number), which is a sensing signal, into a voltage signal.

In step S440, the corona detecting apparatus 100 converts the converted voltage signal into a digital signal to calculate a voltage value. Here, the voltage value may be an integer, and may be a digitized analog voltage signal, and the calculated voltage value may be a maximum value, an instantaneous value, or a root mean square (RMS) value among digitized values.

In step S450, the corona detecting apparatus 100 determines the degree of abnormality of the electric power facility using the converted voltage value.

More specifically, the corona detecting apparatus 100 compares the calculated voltage value with a plurality of preset reference voltage values, and determines the degree of abnormality of the electric power equipment according to the voltage value, for example, as shown in Table 1 below, , Warning, and replacement.

step Stage 1
(observe) Step 2
(caution) Step 3
(warning) Step 4
(Replacement required) Detector display 30 or less More than 30 and less than 40 More than 40 and less than 50 Over 50

In addition, the corona detecting apparatus 100 can measure the voltage value calculated as shown in Table 2 below as an insulation resistance measurement value used as a criterion for determining the abnormality of the electric power facility, have.

Insulation resistance measurement value
(MΩ) 50 100 200 300 400 500 600 700 800 900 1000 Voltage value 300 100 70 60 50 45 40 35 27 19 12

In step S460, the corona detecting apparatus 100 outputs a video signal or an audio signal as an abnormality of the electric power facility.

5 is a view for explaining an external shape of a corona detecting apparatus according to an embodiment of the present invention.

5, a corona detecting apparatus 100 according to an embodiment of the present invention includes a sensing unit 110, a signal processing unit 120, a controller 130, a power unit 140, a power supply connection unit 145, An input unit 150, an output unit 160, an external device connection unit 170, a handle 180, a sightslide 190, and a storage unit 200.

The sensing unit 110 is disposed on one side of the storage unit 200 and is directed to a position where the corona discharge light is generated.

The sensing unit 110 includes at least one, for example, a UV tron header type sensor.

The signal processor 120 converts the sensed corona discharge discharge into a voltage value.

The control unit 130 can determine the degree of abnormality of the electric power facility by using the voltage value converted from the signal processing unit 120 into the digital signal. The control unit 130 may transmit the calculated data to the output unit 160 and instruct the data output. The control unit 130 may compare the voltage value with at least one reference voltage value to determine the degree of abnormality of the electric power facility. Also, the control unit 130 may determine the degree of abnormality of the electric power facility and instruct the output unit 160 to send an alarm according to the abnormality of the electric power facility. In addition, the controller 130 may detect the charging and discharging state of the battery and instruct the output unit 160 to display the battery state.

The power supply unit 140 includes a battery and a DC power generator. The battery supplies power to the DC power generator. The battery can be used for up to 24 hours when fully charged, including rechargeable lithium polymer batteries. The DC power generating unit boosts or reduces the power supplied from the battery to generate a power of 12.6 V DC and 1.2 amp (Amp). Further, the DC power generating section supplies the generated power to the corona detecting apparatus 100.

The power unit 140 receives a power-on signal or a power-off signal from the input unit 150 and provides power to the corona detecting apparatus 100 or terminates power supply.

The power supply connection unit 145 is disposed on one side of the storage unit 200 for charging the power supply unit 140 and supplies external power to the power supply unit 140.

The input unit 150 includes operation switches for operating the corona detecting device 100. [ For example, when the operation switches to the initial state, the input unit 150 generates a zero (zero) at which the default value becomes "0" when the enter key is pressed at the same time as the enter key, (Shift) for moving the generated cursor to a desired position, Up for changing the set value, or Enter for instructing completion of change.

The output unit 160 outputs the degree of abnormality of the power equipment according to the detected corona light. Specifically, the output unit 160 can output at least one of a measured value, a maximum value, an occurrence frequency of the corona discharge light, an abnormality degree of the electric power equipment, a stepwise alarm sound according to the degree of abnormality of the power equipment, a battery voltage, have. For example, the output unit 160 may be a liquid crystal display having 240 x 400 pixels, a color display, and a backlight.

The external device connection unit 170 is disposed on one side of the storage unit 200 for connection of an external device such as the sights. The external device connection unit 170 may be disposed on the other side of the storage unit 200 facing the sensing unit 110, for example, and may be connected to an external device.

The handle 180 is coupled to the storage portion 200 to improve the portability of the corona detecting device 100. [ In addition, the handle 180 enhances the directivity of the sensing portion 110 relative to the power plant.

The sights 190 are coupled to the storage unit 200 to precisely detect the power equipment at a remote location. In addition, the sight mirror 190 can be connected to the external device connection unit 170 to observe an abnormal point of the electric power facility. For example, the sights 190 may include dot sight or laser pointer sights that are identifiable day and night.

The corona detection apparatus 100 has a weight of about 1.5 Kg including, for example, a battery and a sight mirror 190. In addition, the corona detecting device has a size of, for example, a handle 180 and a sill 190, with a width X length X height of about 60 X 240 X 382.

The storage portion 200 extends in one direction to form a rectangular parallelepiped shape, and a storage space is provided therein. For example, the receiving portion 200 may have a length of about 380 mm. The storage unit 200 includes a sensing unit 110, a signal processing unit 120, a control unit 130, an output unit 160, an input unit 150, a power supply unit 140, a power supply connection unit 1450, 170).

The corona detecting apparatus according to another embodiment of the present invention can detect many corners within a short time by detecting a corona signal generated at the time of a facility abnormality by directing a sensing unit to a transmission / distribution power facility or a line.

In addition, the corona detecting apparatus according to another embodiment of the present invention displays the corona discharge numerically, so that anyone can easily read the presence or absence of abnormality in equipment.

Further, the corona detecting apparatus according to another embodiment of the present invention is low in manufacturing cost, and thus can reduce the cost for the abnormal inspection of the power equipment.

Embodiments of the invention may include a computer readable medium having program instructions for performing various computer implemented operations. The computer-readable medium may include program instructions, local data files, local data structures, etc., alone or in combination. The media may be those specially designed and constructed for the present invention or may be those known to those skilled in the computer software.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

Corona detecting device 100 Detector 110
The signal processor 120,
Power supply 140 Input 150
Output section 160 External device connection section 170
Joon Jung Kim 172

Claims (16)

A sensing unit using at least two sensors and sensing a corona discharge generated in a power facility;
A signal processor for determining a corona discharge as an effective signal when the corona discharge is simultaneously detected by the at least two sensors and converting the sensing signal into a voltage signal; And
And a control unit for determining an abnormality degree of the electric power facility using the voltage signal,
The signal processing unit
And a background discharge preventing section for determining that the detection signal is valid when at least two sensors simultaneously detect a corona discharge.
delete The method according to claim 1,
Wherein the sensing unit further comprises a selective transmission unit that selectively transmits a corona discharge in a frequency range of 180 nm to 260 nm.

The method according to claim 1,
The sensing unit
And a diode is separated from one voltage supply circuit to supply a voltage to each of the at least two sensors.

The method according to claim 1,
The signal processing unit
A signal converter for converting a frequency component of the sensing signal into an analog voltage signal through an FV (Frequency Voltage) converter, and converting the analog voltage signal into a digital voltage signal through an AD converter; And
Further comprising a timer for calculating an interval between the signal and the signal to calculate the frequency of detection of the corona discharge.

The method according to claim 1,
Wherein the controller compares the voltage value of the voltage signal with at least one reference voltage value set in advance, and when the voltage value is greater than the predetermined reference voltage value, the power facility determines the degree of abnormality.

The method according to claim 1,
And an output unit for receiving and outputting information on an abnormality degree of the electric power facility determined by the control unit.

The method according to claim 1,
Wherein the sensor is a UV tron type sensor.

The method according to claim 1,
Further comprising a dot sight or a laser pointer siren for determining the precise location of the electric power facility where the corona discharge is generated.

The method according to claim 1,
Wherein the power plant is a power transmission line, a connection point of an electric power facility, or an insulator.

In the corona detection device
A method of monitoring a corona discharge apparatus, comprising the steps of: aiming a corona detection device on an electric power facility to be inspected;
Determining and outputting a sensing signal simultaneously sensed by at least two sensors as a valid signal;
Converting the sensing signal into a voltage value;
Comparing the voltage value with at least one preset reference voltage value; And
And determining an abnormality of the power plant as at least one state according to the voltage value.


12. The method of claim 11,
The step of converting the sensing signal into a voltage value
Converting the sensing signal into a voltage signal; And
And converting the voltage signal into a digital signal to calculate a voltage value.

13. The method according to claim 11 or 12,
The step of aiming the corona detecting device on the power equipment to be inspected and detecting the corona discharge occurring in the power equipment
Aiming at a dot sight or a laser pointer sight to determine the precise location of the power facility where the corona discharge is generated; And
Sensing a corona discharge in an area between 180 nm and 260 nm in frequency.
delete 13. The method according to claim 11 or 12,
Further comprising displaying information on an abnormality degree of the determined power plant.

A program for recording a program for implementing a corona detection method in a corona detecting apparatus,
A method of monitoring a corona discharge apparatus, comprising the steps of: aiming a corona detection device on an electric power facility to be inspected;
Determining and outputting a sensing signal simultaneously sensed by at least two sensors as a valid signal;
Converting the sensing signal into a voltage value;
Comparing the voltage value with at least one preset reference voltage value; And determining the abnormality of the power plant as at least one state according to the voltage value.

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