KR101151674B1 - Arc detector using a photo sensor and method for detecting arc using the same - Google Patents

Arc detector using a photo sensor and method for detecting arc using the same Download PDF

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Publication number
KR101151674B1
KR101151674B1 KR1020100060461A KR20100060461A KR101151674B1 KR 101151674 B1 KR101151674 B1 KR 101151674B1 KR 1020100060461 A KR1020100060461 A KR 1020100060461A KR 20100060461 A KR20100060461 A KR 20100060461A KR 101151674 B1 KR101151674 B1 KR 101151674B1
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South Korea
Prior art keywords
arc
signal
signals
unit
data
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KR1020100060461A
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Korean (ko)
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KR20120000226A (en
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박기주
이동준
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박기주
주식회사 케이디파워
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/0015—Using arc detectors
    • H02H1/0023—Using arc detectors sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices

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Abstract

The present invention relates to an arc detection apparatus and an arc detection method using an optical sensor that can determine whether the arc signal is generated using the light generated when the arc signal is generated, the light sensor for sensing the light generated in the switchgear; And an arc management unit for determining whether an arc signal is generated in the switchboard based on the detection result from the optical sensor, and managing an occurrence history of the arc signal.

Description

ARC DETECTOR USING A PHOTO SENSOR AND METHOD FOR DETECTING ARC USING THE SAME}

The present invention relates to an arc detection device, and more particularly, to an arc detection device and an arc detection method using an optical sensor that can determine whether the arc signal is generated using the light generated during the arc signal.

The conventional arc detection apparatus monitors the generation of the arc signal generated inside the switchgear while being connected to the circuit inside the switchgear. Due to this, there is a complicated problem of installing an arc detection device in the switchgear, and if a problem occurs in the switchgear, whether the problem is caused by the switchgear itself or is it caused by an arc detector connected to the switchgear. There was a problem that could not be clearly distinguished.

In addition, since the switchboard and the arc detector are connected in a circuit, various electrical interference from the switchboard affects the arc detector, which causes the arc detector to accurately detect the arc signal from the switchboard.

The present invention has been made to solve the above problems, and detects the light generated when the arc signal is generated by using an optical sensor, and determines whether the arc signal is generated in the switchboard based on the detected detection signal. It is therefore an object of the present invention to provide an arc detection device that is easy to install and that does not require circuit connection with a switchgear.

Arc detection apparatus using an optical sensor according to the present invention for achieving the above object, the optical sensor for sensing the light generated in the switchgear; And an arc management unit for determining whether an arc signal is generated in the switchboard based on the detection result from the optical sensor, and managing an occurrence history of the arc signal.

The arc management unit, an optical detector for converting the optical signal from the optical sensor into an electrical signal; A sensitivity control unit for adjusting the sensitivity of the electrical signal supplied from the photodetector; A peak detector which checks the magnitudes of the electrical signals sequentially supplied from the sensitivity adjusting unit by predetermined period units and detects the peak electrical signal having the largest value within each period; A contact signal generator for comparing each of the peak electrical signals detected by the peak detector with a preset reference value and generating a contact signal only for the peak electrical signal having a value greater than this reference value; And analyzing at least one kind of signals from the contact signals from the contact signal generator and the peak electrical signals from the peak detector to determine whether an arc signal is generated in the switchboard and to generate an arc signal. Characterized in that it comprises a signal analysis / processing unit for managing the history.

The signal analyzing / processing unit may include: a data sorting unit which receives at least one kind of signals from the contact signals from the contact signal generator and the peak electrical signals from the peak detector, and converts these signals into data according to time zones; And an arc processing unit for determining whether an arc signal is generated based on the data from the data sorting unit, and managing an occurrence history of the arc signal.

The arc processing unit may include a frequency calculating unit calculating a number of signals of any one type of contact signals and peak signals within a preset time, based on the data from the data sorting unit; The number of signals calculated from the frequency calculating unit and the occurrence history of each signal are reported, and the number of signals calculated from the frequency calculating unit is compared with a preset reference frequency value. An alarm unit for generating a warning sound when the reference frequency value is exceeded; And, characterized in that it comprises a history storage unit for storing the occurrence history of the signals from the alarm unit.

The equipment management unit is characterized by consisting of a Human Machine Interface (HMI).

The arc processor further includes a data storage unit for storing data from the data sorter.

The arc management unit transmits information related to the occurrence history of the signals stored in the history storage unit to the equipment management unit, transfers the data stored in the data storage unit to an external device, or arcs the control data from the equipment management unit. It further comprises a data communication unit for transmitting to the management unit.

The external device may include software for identifying a frequency of occurrence of an arc signal generated for a predetermined period of time using data provided from the data storage unit, and for predicting a frequency of occurrence of an arc signal to be generated based on the determined result. It is characterized by.

The software is characterized by predicting the frequency of occurrence of the arc signal generated in the future through an interpolation algorithm.

The software counts the number of pulses of the arc signal generated for a predetermined period, and controls the external device to generate an alarm when the counted number exceeds the alarm level.

In addition, the arc detection method using an optical sensor according to the present invention for achieving the above object, A step of detecting the light generated in the switchgear; And determining the occurrence of the arc signal in the switchboard based on the detection result from the optical sensor, and managing the generation history of the arc signal.

Step B, Step C for converting the optical signal from the optical sensor into an electrical signal;

Step D for adjusting the sensitivity of the electrical signal from step C; An E step of dividing and checking the magnitudes of the electric signals sequentially supplied through the step D for each preset period, and detecting a peak electric signal having the largest value within each period; A step F for comparing each of the peak electrical signals detected from the step E with a preset reference value and generating a contact signal only for the peak electrical signal having a value greater than this reference value; And analyzing at least one signal of the contact signals from the step F and the peak electrical signals from the step E to determine whether the arc signal is generated in the switchgear, and the occurrence history of the arc signal. It is characterized by including the G-level to manage.

The step G includes: a step H of receiving at least one kind of signals from the contact signals from the step F and the peak electrical signals from the step E and converting these signals into data and sorting them according to time zones; And determining an occurrence of the arc signal on the basis of the data from the step H and managing the generation history of the arc signal.

The step I includes: a J step of calculating the number of signals of any one type of the contact signals and the peak signals within a preset time, based on the data from the H step; The number of signals calculated from the step J and the occurrence history of each signal are reported, and the number of signals calculated from the frequency calculating unit is compared with a preset reference frequency value. Generating a beep when the frequency value is exceeded; And, characterized in that it comprises a history storage for storing the history of the occurrence of the signals from the K step.

An arc detection apparatus and arc detection method using the optical sensor according to the present invention has the following effects.

The arc detection device and the arc detection method using the optical sensor according to the present invention detects the light generated when the arc signal is generated by using the optical sensor, and based on the detected detection signal to determine whether the arc signal inside the switchboard By judging, installation is easy and there is no need for circuit connection with the switchboard. Thus, the arc signal can be detected more accurately without the need for a circuit connection with the switchboard.

1 is a view showing an arc detection apparatus using an optical sensor according to an embodiment of the present invention
2 is a detailed configuration diagram of the arc management unit in FIG.
3 is a detailed block diagram illustrating the signal analysis / processing unit of FIG. 2;
4 is a detailed configuration diagram of the arc processing unit of FIG.
5 is a detailed configuration diagram of the frequency calculation unit of FIG.
6 is a flow chart of software installed in an external device
7 and 8 are diagrams showing a method of measuring the risk of an arc signal using software installed in an external device
9 is a view showing a screen displayed on the touch screen of the arc management unit;

1 is a view showing an arc detection apparatus using an optical sensor according to an embodiment of the present invention.

Arc detection apparatus using an optical sensor according to an embodiment of the present invention, as shown in Figure 1, the optical sensor 101 for detecting the light generated in the switchgear, and the detection result from the optical sensor 101 Based on the determination whether the arc signal is generated within the switchgear, and includes an arc management unit 102 for managing the history of the arc signal generation.

The optical sensor 101 is mounted inside the switchgear to sense light generated inside the switchgear. This light may be light due to an arc signal generated inside the switchboard, or may be ambient light from outside the switchboard. The optical sensor 101 detects such light and generates a light detection signal, and supplies it to the arc manager 102.

The arc manager 102 analyzes the light detection signal from the light sensor 101 to determine whether the light is actually light generated by the arc signal or light by ambient light. In addition, when an arc signal is generated, the arc management unit 102 manages the history of generation of the arc signal related to the time, magnitude, frequency and frequency of occurrence of the arc signal. In addition, the arc manager 102 notifies the equipment manager 103 when the risk of the arc signal exceeds a preset alarm level in consideration of the occurrence time, magnitude, frequency, frequency, etc. of the arc signal. Allow managers of the management unit 103 to take appropriate measures. For example, the managers of the equipment management unit 103 can control the switchboard where the arc signal is generated through the HMI (Human Machine Interface). The arc management unit 102 is a local personal computer (PC) having a touch screen, and the arc management unit 102 may be attached to the outside of the switchboard. The operator can determine whether there is an abnormality of the switchboard, that is, whether an arc signal is generated and the degree of danger through information displayed on the touch screen of the arc manager 102 attached to the switchboard. Each arc switch unit 102 and an optical sensor 101 are independently attached to each switchgear, and each arc manager 102 is managed and controlled by one equipment manager 103.

For this operation, the arc management unit 102 may have the following configuration.

2 is a detailed configuration diagram of the arc management unit 102 in FIG.

As shown in FIG. 2, the arc manager 102 includes an optical detector 201, a sensitivity controller 202, a peak detector 203, a contact signal generator 204, and a signal analyzer / processor 205. Include.

The optical detector 201 converts the optical signal from the optical sensor 101 into an electrical signal. That is, the photodetector 201 converts a light signal into an electrical signal by using an action such as a photoelectric effect or a photoconductive effect.

The sensitivity adjusting unit 202 adjusts the sensitivity of the electric signal supplied from the photodetector 201, and the sensitivity adjusting unit 202 may be configured as a variable resistor. The sensitivity control unit 202 amplifies it at a predetermined ratio when the electrical signal is weak, and attenuates it at a predetermined ratio when the electrical signal is strong.

The peak detector 203 checks the magnitudes of the electrical signals sequentially supplied from the sensitivity adjusting unit 202 for each predetermined period unit, and detects the peak electrical signal having the largest value within each period. That is, for example, the peak detector 203 may compare the magnitudes of the electrical signals every one second, and select and output only the electrical signals having the largest value as the peak signal during this one second. In other words, the electric signal having the largest value among the electric signals input between 1 second and 2 seconds is selected as the peak signal in the 1 second and 2 second periods, and the electric signal input between 2 and 3 seconds. The electric signal having the largest value among them can be selected as the peak signal in these 2 and 3 second periods.

The contact signal generator 204 compares each of the peak electrical signals detected from the peak detector 203 with a preset reference value, and generates a contact signal only for peak electrical signals having a value larger than this reference value. In other words, the contact signal generator 204 filters only peak signals larger than the reference value and digitizes the analog peak signals.

The signal analysis / processing unit 205 analyzes at least any one of the contact signals from the contact signal generator 204 and the peak electrical signals from the peak detector 203 to generate an arc signal in the switchboard. In addition to managing the occurrence history of the arc signal. The signal analysis / processing unit 205 may be provided with only the above-described contact signals, analyze them, determine whether the arc signal is generated, and manage the generation history of the arc signal, or provide only peak signals instead of the contact signals. Receive and analyze them, determine whether the arc signal is generated, and manage the history of the arc signal, or receive two kinds of signals, that is, contact signals and peak signals, to analyze them and determine whether the arc signals are generated. It is also possible to determine and manage the generation history of the arc signal. When analyzing both types of signals, the signal analysis / processing unit 205 first receives only one of the two types of signals, for example, contact signals, analyzes them, and then peaks. You can also receive signals and analyze them. This analysis sequence is an example to the last, and the signal analysis / processing unit 205 may receive and analyze peak signals first, and then receive and analyze contact signals. As another method, two signal analyzing / processing units 205 are installed so that one signal analyzing / processing unit 205 receives and analyzes only the contact signals, and the other signal analyzing / processing unit 205 Only peak signals can be accepted and analyzed.

As such, when analyzing two types of signals, that is, contact signals and peak signals, the result may be different in each case. For example, when the signal analysis / processing unit 205 analyzes only the contact signals, it recognizes that an arc signal has occurred in the switchgear, while analyzing only the peak signals, it determines that the arc signal does not occur in the switchgear. In some cases. As such, when two types of signals are analyzed to reach different results, the operator located in the equipment management unit finally determines the result. On the other hand, for a more certain judgment, the operator can go directly to the site where the switchboard is located, it is possible to check whether the arc signal in the switchboard.

Meanwhile, as shown in FIG. 2, the arc management unit 102 may further include a data communication unit 206, and the data communication unit 206 may transmit / receive data with the equipment management unit 103 and an external device. As a device for the data communication unit 206, at least one or more of RS-485, TCP / IP, and Modubus protocol formats may be used.

Here, the signal analysis / processing unit 205 will be described in more detail as follows.

3 is a detailed block diagram illustrating the signal analysis / processing unit 205 of FIG. 2.

The signal analysis / processing unit 205 includes a data sorting unit 301 and an arc processing unit 302, as shown in FIG.

The data sorting unit 301 receives signals of at least one of the contact signals from the contact signal generator 204 and the peak electrical signals from the peak detector 203, and sorts the signals by time. . That is, the data sorting unit 301 serves to generate raw data required for actual analysis. As one example, the data sorting unit 301 is provided from the contact signal generating unit 204. Each of the contact signals may be aligned according to the time of occurrence. Of course, the data sorter 301 may sort each of the peak signals provided from the peak detector 203 according to the time of occurrence. The data sorter 301 may also be configured in two like the signal analyzer / processor 205. In this case, one data sorter 301 sorts only the contact signals, and the other data sorter 301 sorts only the peak signals.

The arc processor 302 determines whether an arc signal is generated based on the data from the data sorter 301, and manages an arc signal generation history. That is, the arc processing unit 302 determines whether the arc signal is generated on the basis of the raw material data provided from the data sorting unit 301, and also manages the generation history of the arc signal. The arc processor 302 may also be configured in two like the signal analyzer / processor 205. At this time, one arc processing unit 302 determines whether the arc signal is generated on the basis of the raw material data consisting of the contact signal and manages the generation history of the arc signal, the other arc processing unit 302 is the peak signal Based on the raw material data consisting of the determination of whether the arc signal is generated and manages the generation history of the arc signal.

The arc processing unit 302 will be described in more detail as follows.

4 is a detailed configuration diagram of the arc processing unit 302 of FIG.

As illustrated in FIG. 4, the arc processing unit 302 includes a frequency calculating unit 401, an alarm unit 402, and a history storage unit 403.

The frequency calculator 401 calculates the number of signals of any one of the contact signals and the peak signals within a preset time, based on the data from the data sorter 301. That is, the frequency calculating unit 401 analyzes the raw material data supplied from the data sorting unit 301 to determine how many contact signals or peak signals are generated for a predetermined time, thereby generating the frequency of contact signals or peak signals. To calculate. The frequency calculator 401 may also be configured in two like the signal analyzer / processor 205. At this time, one frequency calculating unit 401 calculates the frequency of occurrence of these contact signals within a predetermined period based on the raw material data composed of the contact signals, and the other frequency calculating unit 401 is a raw material composed of peak signals. Based on the data, the frequency of occurrence of these peak signals in a certain period of time is calculated.

The alarm unit 402 reports the number of signals calculated from the frequency calculator 401 and the generation history of each signal. In addition, the alarm unit 402 compares the number of signals calculated from the frequency calculating unit 401 with a preset reference frequency value and generates a warning sound when the number of these signals exceeds the reference frequency value as a result of the comparison. do. For example, when the number of contact signals exceeds a preset reference frequency, the alarm unit 402 reports the time, magnitude, and state of occurrence of these contact signals, and writes them in real time. ). Of course, when the number of peak signals exceeds a preset reference frequency value, the alarm unit 402 reports the time, magnitude, and state of occurrence of these peak signals, and writes them to the history storage unit 403 in real time. It also saves. The alarm unit 402 may also be configured in two like the signal analysis / processing unit 205. At this time, one alarm unit 402 generates a report and generates a warning sound based on the raw material data composed of the contact signals, and the other alarm unit 402 generates and generates a report based on the raw material data composed of the peak signals. Perform beeping. These contact signals and peak signals of a predetermined magnitude or more mean that an arc signal has been generated, and the risk of the generated arc signal is determined by how many of these signals are generated for a predetermined time.

Meanwhile, the arc processing unit 302 may further include a data storage unit for storing data from the data sorting unit 301. That is, the raw material data is stored in this data storage unit. The worker may connect an external device, for example, a notebook, to the data storage unit through the data communication unit 206 to download the raw material data stored in the data storage unit to the notebook. The notebook is equipped with software that can use the raw data to determine whether an arc signal has occurred, how often the arc signal occurs, and the tendency of the arc signal. The software allows the operator to analyze the raw material data and use it to predict the frequency and trends of future arc signals.

The history storage unit 403 stores a generation history of signals from the alarm unit 402. The history storage unit 403 may also be configured as two, such as the signal analysis / processing unit 205, one history storage unit 403 stores the generation history of the contact signal, the other one history storage unit ( 403 stores a generation history of peak signals.

The data communication unit 206 previously described above transmits information related to the generation history of signals stored in the history storage unit 403 to the equipment manager 103, or transmits data stored in the data storage unit to an external device, Alternatively, the control data from the equipment manager 103 is transmitted to the arc manager 102. Therefore, the managers of the equipment management unit 103 can know whether the arc signal is generated in each switchgear in real time, the history of the arc signal and the degree of risk without going to the field. In addition, the managers of the equipment management unit 103 can take appropriate measures remotely to the switchboard where the arc signal is generated through the HMI.

FIG. 5 is a detailed configuration diagram of the frequency calculating unit 401 of FIG. 4.

As shown in FIG. 4, the frequency calculator 401 may include a second counter 501, a minute counter 502, and a time counter 503.

The second unit counter 501 allows the frequency calculating unit 401 to display the number of occurrences of the arc signal in seconds on the touch screen, and the minute unit counter 502 allows the frequency calculating unit 401 to display the arc signal in minutes. The number of occurrences is displayed on the touch screen, and the time unit counter 503 causes the frequency calculating unit 401 to indicate the number of occurrences of the arc signal on an hourly basis on the touch screen. These seconds, minutes, and hours are just one example, and this time can be varied.

FIG. 6 is a flow chart of software installed in an external device. As shown in this figure, the software uses raw material data to determine whether an arc signal is generated, how often the arc signal is generated, and the tendency of the arc signal. Figure out. The software allows the operator to analyze the raw material data, and to use it to predict the frequency and trends of future arc signals, and to analyze and assess the risk. In particular, the software uses interpolation algorithms to predict the frequency and trends of future arc signals.

7 and 8 are diagrams illustrating a method of measuring a risk of an arc signal using software installed in an external device.

As shown in Fig. 7, the software counts the number of pulses of the arc signal generated over a period of time. As shown in Fig. 8, on the basis of this counted number, the generation trend of the arc signal for a predetermined period is shown in a graph of a real data format and a graph of a fitted trend data format. The software controls the external device to generate an alarm when this counted number exceeds the alarm level.

9 is a view showing a screen displayed on the touch screen of the arc management unit 102, as shown in the figure, the arc graph shows the number of occurrences of the arc signal by the unit of seconds, minutes, hours, event list Shows the time, magnitude, and state of occurrence of the arc signal.

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 general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

101: optical sensor 102: arc management unit
103: equipment management department

Claims (14)

An optical sensor for sensing light generated from the switchboard; And,
An optical detector for converting the optical signal from the optical sensor into an electrical signal, a sensitivity adjusting unit for adjusting the sensitivity of the electrical signal supplied from the optical detector, and a magnitude of the electrical signals sequentially supplied from the sensitivity adjusting unit in advance The peak detection unit detects the peak electric signal having the largest value within each period, and checks each of the peak electric signals detected from the peak detection unit with a preset reference value. The switchboard by analyzing a signal of the contact signal generator that generates a contact signal only for the peak electrical signal having a value, and at least one signal of the contact signals from the contact signal generator and the peak electrical signals from the peak detector. To determine the occurrence of the arc signal in the No. arc detection device using the optical sensor, characterized in that it comprises an arc management includes the analysis / processing. delete The method of claim 1,
The signal analysis / processing unit,
A data sorting unit receiving at least one type of signals of the contact signals from the contact signal generator and the peak electrical signals from the peak detector, and sorting the signals by time; And,
And an arc processing unit for determining whether an arc signal is generated based on the data from the data sorting unit, and for managing a history of generating the arc signal. The method of claim 3, wherein
The arc processing unit,
A frequency calculating unit calculating the number of signals of any one type of contact signals and peak signals within a preset time based on the data from the data sorting unit;
The number of signals calculated from the frequency calculating unit and the occurrence history of each signal are reported, and the number of signals calculated from the frequency calculating unit is compared with a preset reference frequency value. An alarm unit for generating a warning sound when the number of calculated signals exceeds a reference frequency value; And,
Arc detection device using an optical sensor, characterized in that it comprises a history storage for storing the occurrence history of the signals from the alarm unit. delete The method of claim 4, wherein
The arc processing unit further comprises a data storage unit for storing data from the data sorting unit arc detection apparatus using an optical sensor. The method according to claim 6,
The arc management unit,
Data for transmitting information related to the occurrence history of the signals stored in the history storage unit to the equipment management unit, or transfer the data stored in the data storage unit to an external device, or transmits control data from the equipment management unit to the arc management unit Arc detection device using an optical sensor, characterized in that further comprising a communication unit. The method of claim 7, wherein
The external device,
And using the data provided from the data storage unit, to identify the frequency of occurrence of the arc signal generated for a predetermined period of time, and to estimate the frequency of occurrence of the arc signal to be generated on the basis of the determined result. Arc detection device using optical sensor. The method of claim 8,
The software is arc detection device using a sensor, characterized in that for predicting the frequency of occurrence of the arc signal generated in the future through an interpolation algorithm. The method of claim 9,
The software counts the number of pulses of the arc signal generated during a certain period, and if the counted number exceeds the alarm level, the arc detection apparatus using an optical sensor, characterized in that for controlling the external device to generate an alarm. delete delete delete delete
KR1020100060461A 2010-06-25 2010-06-25 Arc detector using a photo sensor and method for detecting arc using the same KR101151674B1 (en)

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KR101489300B1 (en) * 2012-06-07 2015-02-04 (주) 디지털파워 An Integrating Incoming and Distributing Board for Monitoring the Arc, Partial Discharge, and Temperature and The Controling Method therof
US11313930B1 (en) 2020-11-13 2022-04-26 Rohde & Schwarz Gmbh & Co. Kg Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors
KR102233162B1 (en) * 2021-01-11 2021-03-29 주식회사 대광종합기술 The failure section monitoring alarm of the underground distribution line

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Publication number Priority date Publication date Assignee Title
JP2519248B2 (en) 1986-06-09 1996-07-31 ベ−・ベ−・ツエ−・ブラウン・ボベリ・アクチエンゲゼルシヤフト Jamming arc detector
KR100755955B1 (en) 2007-03-15 2007-09-06 주식회사 젤파워 System for fault diagnosing of receiving and distributing electricity equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2519248B2 (en) 1986-06-09 1996-07-31 ベ−・ベ−・ツエ−・ブラウン・ボベリ・アクチエンゲゼルシヤフト Jamming arc detector
KR100755955B1 (en) 2007-03-15 2007-09-06 주식회사 젤파워 System for fault diagnosing of receiving and distributing electricity equipment

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