KR101350529B1 - Partial dischange decision apparatus and method having noise rejection function - Google Patents

Abstract

The present invention relates to a partial discharge determination device with a noise removing function and a method thereof. The partial discharge determination device disclosed in the present invention includes: a sensor unit which senses an electromagnetic signal from a power device; an RF signal processing unit which filters the sensed electromagnetic signal and converts the filtered electromagnetic signal into a digital signal; a power frequency synchronization signal detection unit which removes the power frequency synchronization signal included in the digital signal and generates a first filtering signal; a mobile phone signal detection unit which removes the mobile phone signal included in the first filtering signal and generates a second filtering signal; other external signal detection unit which removes other external signals included in the second filtering signal and generates a third filtering signal; and a communication unit which transmits the third filtering signal to a server which determines the partial discharge. [Reference numerals] (110) Sensor unit; (120) RF signal processing unit; (130) Power frequency synchronization signal detection unit; (140) Mobile phone signal detection unit; (150) Other external signal detection unit; (160) Communication unit; (200) Server

Description

PARTIAL DISCHANGE DECISION APPARATUS AND METHOD HAVING NOISE REJECTION FUNCTION

The present invention relates to an apparatus and method for determining a partial discharge having a noise canceling function. More specifically, the present invention relates to an electromagnetic wave generated from a power device, including a commercial frequency synchronization signal, a mobile phone signal, and other external signals. It relates to a partial discharge determination device and method having a function of removing external noise.

Conventional methods of detecting and diagnosing a partial discharge signal generated inside a high voltage cable, a gas insulated switchgear (GIS), and a transformer are as follows.

First, there is a method of diagnosing partial discharge using an external noise shielding agent after installing it in a power device. However, this method requires the installation of different shielding agents depending on the manufacturer, the voltage used, and the place of use, and this is only possible for one-time installation. In addition, since the shielding agent must be mounted in the enclosure of the power device, there is a problem that the electrostatic work of the transformer, which is an ultrahigh voltage installation, must be preceded.

Second, there is a noise gating method using an external noise antenna and a sensor. In this method, the external noise antenna and sensor are used to transmit the measured signals to the server so that the server can diagnose partial discharge. However, this method requires many external settings such as the installation location, installation direction, and threshold voltage setting (threshold level) of the external noise antenna. Therefore, depending on the environment and the person operating this apparatus, external noise is determined, for example, a cellular phone communication signal or the like is interpreted as a partial discharge signal. In addition, if the number of sensors is high and the external noise signal is frequently generated, this method may cause a failure due to the excessive amount of data processed by the server.

In this regard, the name of the invention is "Portable Partial Discharge Diagnosis System", and Korean Patent Publication No. 2012-0022125 published on March 12, 2012 exists. The patent provides a diagnostic system that can increase the reliability of the analysis of the partial discharge by applying a voltage analysis, a pulse analysis and a neural network algorithm according to the phase for the high frequency signal detected from the high-voltage equipment.

An object of the present invention is to provide an apparatus and method for stably and accurately determining a partial discharge by reducing the burden on a server without clearly distinguishing the partial discharge signal from external noise noise and confusing it. In addition, it is necessary to compensate for the disadvantages such as the installation of the shielding method mounted on the outside of the power device and power failure during dismantling.

The partial discharge device of the present invention for solving the above problems is a sensor unit for detecting the electromagnetic wave signal generated in the power device; An RF signal processor for filtering the detected electromagnetic wave signal and converting the filtered electromagnetic wave signal into a digital signal; A commercial frequency synchronizing signal detector for generating a first filtering signal by removing the commercial frequency synchronizing signal included in the digital signal; A mobile phone signal detector for generating a second filtering signal by removing the mobile phone signal included in the first filtering signal; An other external signal detector which generates a third filtering signal by removing other external signals included in the second filtering signal; And a communication unit which transmits a third filtering signal to a server that performs a partial discharge determination function.

The commercial frequency synchronizing signal detector may include: a synchronizing signal comparator configured to generate a harmonic signal of a commercial frequency, and then compare at least one of a phase, a signal magnitude, and the number of signals per cycle of the harmonic signal and the digital signal; And a synchronization signal filtering unit for removing the same portion from the digital signal and generating the first filtering signal when it is determined that the same portion as the harmonic signal exists in the digital signal.

The mobile phone signal detector may include a mobile phone signal comparator comparing the first filtering signal with a mobile phone signal including at least one of a mobile phone call signal, a mobile phone call signal, and a mobile phone data communication signal included in a database; And a mobile phone signal filtering unit configured to remove the same part from the first filtering signal and generate a second filtering signal when it is determined that the same part as the mobile phone signal exists in the first filtering signal.

The other external signal detection unit may further include: a second signal comparator for comparing the second filtering signal with other signal data including a circuit breaker operation signal and a lightning generation signal included in the other external signal removal program; And an other signal filtering unit which removes the same portion from the second filtering signal and generates the third filtering signal when it is determined that the same portion as the other signal data exists in the second filtering signal.

And the partial discharge method of the present invention for solving the above problems is a step of detecting the electromagnetic wave signal generated in the power device; Filtering the sensed electromagnetic wave signal and converting the filtered electromagnetic wave signal into a digital signal; Generating a first filtering signal by removing the commercial frequency synchronization signal included in the digital signal; Generating a second filtering signal by removing the cellular phone signal included in the first filtering signal; Generating a third filtering signal by removing other external signals included in the second filtering signal; And transmitting a third filtering signal to a server having a partial discharge determination function.

The generating of the first filtering signal may include generating a harmonic signal having a commercial frequency, and then comparing at least one of a harmonic signal and a phase, signal magnitude, and number of signals per cycle of the digital signal; And if it is determined that the same portion as the harmonic signal exists in the digital signal, removing the same portion from the digital signal and generating the first filtering signal.

The generating of the second filtering signal may include: comparing the first filtering signal with a mobile phone signal including at least one of a mobile phone call signal, a mobile phone call signal, and a mobile phone data communication signal included in a database; And if it is determined that the same portion as the cellular phone signal exists in the first filtering signal, removing the same portion from the first filtering signal and generating a second filtering signal.

The generating of the third filtering signal may include comparing the second filtering signal with other signal data including a circuit breaker operation signal included in the external signal removing program and a lightning occurrence signal; And if it is determined that the same portion as other signal data exists in the second filtering signal, removing the same portion from the second filtering signal and generating a third filtering signal.

According to the present invention, when determining the partial discharge based on the electromagnetic wave signal generated in the power device, there is an advantage that little influence on the external noise. In addition, unlike the case where the noise determination and the partial discharge signal are both performed at the server, a separate device may be provided to perform noise determination and removal, thereby reducing the burden on the server. In addition, unlike the shielding method which can be installed outside the power equipment together with the blackout operation, and using only the signal of the sensor installed, it is possible to effectively remove noise from the live power equipment without the need for the blackout work. . This has the advantage of enabling more reliable and accurate determination of partial discharge than the prior art.

1 is a block diagram showing a partial discharge determining apparatus of the present invention.
Fig. 2 is a block diagram showing a commercial frequency synchronization signal detection unit of the partial discharge determination device of the present invention.
3 is a block diagram showing a mobile phone signal detection unit of the partial discharge determination device of the present invention.
Fig. 4 is a block diagram showing another external signal detector of the partial discharge determining apparatus of the present invention.
Fig. 5 is a flowchart showing the partial discharge determination method of the present invention.
6 is a flowchart specifically illustrating a step for detecting a commercial frequency synchronization signal in the partial discharge determination method of the present invention.
7 is a flowchart specifically illustrating a mobile phone signal detection step of the partial discharge determination method of the present invention.
8 is a block diagram specifically showing other external signal detection steps in the partial discharge determination method of the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, the partial discharge determination apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

1 is a block diagram showing a partial discharge determining apparatus 10. As shown in FIG. 1, the partial discharge determining apparatus 10 according to an exemplary embodiment of the present invention includes a noise removing device 100 and a server 200. In addition, the noise canceling apparatus 100 of the partial discharge determination apparatus 10 includes a sensor unit 110, an RF signal processing unit 120, a commercial frequency synchronization signal detection unit 130, a mobile phone signal detection unit 140, and other external signal detection units. 150 and the communication unit 160. Each configuration shown in Fig. 1 is described in detail below.

The sensor unit 110 functions to detect an electromagnetic wave signal generated from the power device. The sensor unit 110 may be configured as a UHF sensor, through which the electromagnetic wave signal may be measured to detect the partial discharge signal. Although FIG. 2 illustrates that the sensor unit 110 is included in the noise canceling apparatus 100, the sensor unit 110 may be located inside or outside the power device, and may also be a drain type.

The RF signal processing unit 120 first filters the electromagnetic wave signal detected by the sensor unit 110. Here, the filtering of the RF signal processor 120 is performed using a high pass filter (HPF) and a low pass filter (LPF). Therefore, the electromagnetic wave signal detected from the sensor unit 110 is filtered leaving only a predetermined band of 500 MHz to 1.5 GHz. Through this, the RF signal processor 120 performs a role of primary noise cancellation. After the filtering is performed, the RF signal processor 120 converts the filtered electromagnetic wave signal into a digital signal.

The commercial frequency synchronization signal detector 130 receives a digital signal from the RF signal processor 120 and then removes the commercial frequency synchronization signal of the commercial frequency included in the digital signal. More specifically, the commercial frequency synchronization signal detection unit 130 generates data of dozens of harmonic signals based on the commercial frequency (50/60 Hz), compares them, and compares them with a noise signal to the digital signal transmitted from the RF signal processing unit 120. Determine if is present. If it is determined that a noise signal exists in the digital signal, the noise signal portion is removed from the digital signal. At this time, the signal to be removed includes an external noise generated during operation of the electric motor, discharge lamp, dust collector, arc welding machine. Thereafter, the signal is transmitted to the cellular phone signal detection unit 140. In addition, if it is determined that there is no noise signal in the digital signal, the signal is transferred to the cellular phone signal detector 140 for additional noise detection. Hereinafter, the digital signal transmitted from the commercial frequency synchronization signal detection unit 130 to the mobile phone signal detection unit 140, that is, the foregoing process, is removed, or does not include the first signal, in order to clearly distinguish terms. It is referred to as a signal.

The cellular phone signal detector 140 receives the digital signal transmitted from the commercial frequency synchronization signal detector 130, that is, the first filtering signal, and then removes the cellular phone signal included in the first filtering signal. Here, the cellular phone signal includes at least one of a cellular phone outgoing signal, a cellular phone call signal, and a cellular phone data communication signal. Like the commercial frequency synchronization signal detector 130, when it is determined that the mobile phone signal exists in the first filtering signal, the mobile phone signal is removed from the first filtering signal. Thereafter, the first filtering signal from which the cellular phone signal is removed is transferred to the other external signal detector 150. On the other hand, if it is determined that the cellular phone signal does not exist in the first filtering signal, the first filtering signal is transmitted to the other external signal detector 150 for additional noise detection. Hereinafter, the first filtering signal transmitted from the cellular phone signal signal detector 140 to the other external signal detector 150 for the purpose of clarification of the term, that is, the cellular phone signal is removed or does not include the first signal, 2 is referred to as a filtering signal.

While the above-described detection units use a hardware detection method, the other external signal detection unit 150 below uses a software detection method.

The other external signal detector 150 receives a signal transmitted from the mobile phone signal detector 140, that is, a second filtering signal, and then removes other external signals included in the second filtering signal. Here, the term "other external signal" is an electromagnetic noise signal generated at the substation site, and includes an electromagnetic signal generated when the circuit breaker operates, an electromagnetic signal generated when a lightning strike occurs, an external corona discharge signal, and the like. If it is determined that other external signals exist in the second filtering signal, the other external signals present in the second filtering signal are regarded as noise signals and removed. Thereafter, the second filtering signal from which other external signals are removed is transmitted to the communication unit 160. On the other hand, if it is determined that the noise signal does not exist in the second filtering signal, the second filtering signal is considered to not include the noise signal and is transmitted to the communication unit 160. Hereinafter, the second filtering signal, which is transmitted from the other external signal detection unit 150 to the communication unit 160 to be clearly distinguished, that is, the other external signal is removed or does not include it through the foregoing process, is filtered. It is referred to as a signal. It should be appreciated that this third filtering signal is a signal from which noise is removed or noise is not present at the preceding detectors.

The commercial frequency synchronization signal detector 130, the mobile phone signal detector 140, and the other external signal detector 150 described above are arranged in order of high frequency of noise through various experimental data. However, it should be understood that the order of these detectors 130, 140, 150 may be arbitrarily changed.

The communicator 160 transmits the signal transmitted from the other external signal detector 150, that is, the third filtering signal, to the server 200 through TCP / IP communication. The third filtering signal is stored in the server 200 and analyzes the stored signal through an analysis method including a phase resolved pulse sequence (PRPS) and a phase resolved partial discharge (PRPD). This determines the type of discharge and the result is displayed to the user via the HMI program.

Hereinafter, the commercial frequency synchronization signal detector 130, the mobile phone signal detector 140, and other external signal detectors 150 included in the noise canceling apparatus 100 of the present invention will be described in more detail with reference to FIGS. 2 to 4. Do it.

2 is a block diagram of a commercial frequency synchronization signal detection unit 130 included in the noise reduction device 100 of the present invention. The commercial frequency sync signal detector 130 includes a sync signal comparator 131, a sync signal filter 132, and a harmonic signal generator 133.

First, the commercial frequency synchronization signal detector 130 receives a digital signal from the RF signal processor 120. Thereafter, the harmonic signal generator 133 generates data of dozens of harmonic signals at a basic 60 Hz based on a commercially available electrical signal of 50/60 Hz. Thereafter, the phase, magnitude, and number of signals per period of the digital signal and the harmonic signal received through the synchronization signal comparator 131 are compared. Through this comparison, the synchronization signal filtering unit 132 determines whether the digital signal has the same portion as the harmonic signal, that is, whether the harmonic signal exists in the digital signal. When it is determined that a harmonic signal exists in the digital signal, the harmonic signal included in the digital signal, that is, the noise signal is removed. The noise signal removed here includes external noise generated during operation of the motor, discharge lamp, dust collector, and arc welder, as mentioned above. Thereafter, the digital signal from which the noise signal is removed is transmitted to the cellular phone signal detector 140. On the other hand, if it is determined that no harmonic signal exists in the digital signal, the digital signal is transmitted to the mobile phone signal detector 140. As mentioned above, the digital signal transmitted from the commercial frequency synchronization signal detection unit 130 to the mobile phone signal detection unit 140, that is, the harmonic signal is removed or does not include the first process is referred to as the first filtering signal. .

3 is a block diagram of a mobile phone signal detector 140 included in the noise reduction device 100 of the present invention. The mobile phone signal detector 140 includes a mobile phone signal comparator 141, a mobile phone signal filter 142, and a database 143.

The mobile phone signal detector 140 first receives a digital signal, that is, a first filtering signal, from the commercial frequency synchronization signal detector 130. As mentioned above, the first filtering signal is a signal in which no noise is found in the commercial frequency synchronization signal detector 130 or the noise is removed. Thereafter, the cellular phone signal comparator 141 compares the cellular phone signal stored in the database 143 with the first filtering signal in seconds. Here, the cellular phone signal stored in the database 143 includes at least one of an outgoing signal, a call signal, and a data communication signal of the cellular phone. In addition, the communication signal of the existing communication service provider is stored in the database 143, which may be updated with new data according to the change of the communication environment. The database 143 also includes data patterns used in communication such as mobile phone call, call data call, and the like. The cellular phone signal filtering unit 142 determines whether a cellular phone signal exists in the first filtering signal through a comparison in the cellular phone signal comparator 141. If the cellular phone signal is present in the first filtering signal, it is assumed that the cellular phone signal, that is, the noise signal is present in the first filtering signal, and the noise signal is removed from the first filtering signal. Thereafter, the first filtering signal from which the noise signal is removed is transmitted to the other external signal detector 150. On the other hand, if the noise signal is not present in the first filtering signal, the first filtering signal is transmitted to the other external signal detector 150. As mentioned above, for the sake of clarity, the first filtering signal transmitted from the cellular phone signal detector 140 to the other external signal detector 150, that is, the cell signal is removed or does not include the first signal is transmitted. 2 is referred to as a filtering signal.

4 is a block diagram of the other external signal detector 150 included in the noise canceling apparatus 100 of the present invention. The other external signal detector 150 includes a guitar signal comparator 151 and other signal filter 152. In addition, the operation performed by the other external signal detection unit 150 is characterized by using a software environment.

The other external signal detector 150 receives a signal, that is, a second filtering signal, from the cellular phone signal detector 140. As mentioned above, the second filtering signal is a signal for which no noise is found in the cellular phone signal detector 140 or a signal from which the noise is removed. Thereafter, the digital signal transmitted from the other signal comparator 151 is compared with a database stored in the other external signal removing program. This database stores the phase, period and maximum values of other external signals. As mentioned above, other external signals include electromagnetic signals generated when the circuit breaker operates, electromagnetic signals generated when lightning strikes, external corona discharge signals, and the like. Therefore, the other external signal removal program in the other external signal detection unit 150 includes a program capable of detecting each of these cases. An example of these programs follows.

First, the breaker operation signal comparison program analyzes the characteristics of the high frequency signal generated during the breaker operation and disconnector operation in the substation site. The characteristics of the electromagnetic wave signal generated when the breaker or disconnector is operated are as follows.

1. Phase: The electromagnetic wave signals generated when the breaker or disconnector is operated are randomly distributed between 0 and 360 degrees without any characteristic when analyzed by the phase axis.

2. Discharge signal cycle: When analyzing the electromagnetic wave signal generated during breaker or disconnector operation with the period of 50, 60Hz of power, it has a signal within 10 cycles.

3. Maximum value: The phase with the maximum magnitude when analyzing the electromagnetic wave signals generated during the operation of breakers and disconnectors is distributed between the power supply phases between 90 degrees and 270 degrees.

Therefore, the breaker operating signal comparison program performs the comparison considering the three characteristics of the second filtering signal.

As another example, an example of a lightning generation signal comparison program will be described. This lightning generation signal comparison program compares the characteristics of a high frequency signal generated when a lightning strike occurs. The characteristics of the electromagnetic wave signal generated when a lightning strike occurs are as follows.

1. Phase: When the electromagnetic wave signals generated during lightning strikes are analyzed by the phase axis, they are distributed between 0 and 360 degrees without any characteristic and occur in a narrow phase region (within 90 degrees).

2. Discharge signal cycle: It has a signal distribution within 1 cycle when analyzing the electromagnetic wave signal generated in the event of lightning strike with the period of 50 / 60Hz of power.

3. Maximum value: When analyzing the electromagnetic wave signals generated by lightning strikes with the phase axis, one point has the largest magnitude, the other signal is smaller than the maximum value, and the phase is distributed regardless of the power phase.

Therefore, the lightning strike signal comparison program performs a comparison in consideration of the three characteristics before the signal received from the mobile phone signal detector 140.

In other embodiments, other external signal removal programs may also take into account the above-mentioned breaker activation signals, lightning strike signals and corona discharge signals, as well as other noise signals such as radar signals or broadcast waves generated at military radar sites.

After performing the above-described comparison, if it is determined that a noise signal exists in the second filtering signal, the noise signal present in the second filtering signal is removed. Thereafter, the second filtering signal from which the noise signal is removed is transmitted to the communication unit 160. On the contrary, if it is determined that no noise signal exists in the second filtering signal, the second filtering signal is regarded as a partial discharge signal that does not include the noise signal. Thereafter, the second filtering signal is transmitted to the communication unit 160.

Hereinafter, a partial discharge determination method according to an embodiment of the present invention will be described with reference to FIGS. 5 to 8.

5 is a flowchart illustrating a partial discharge determination method.

First, a step (S210) of detecting an electromagnetic wave signal generated from a power device is performed.

Thereafter, the step S220 of filtering the sensed electromagnetic wave signal is performed. As mentioned earlier, this filtering uses a high pass filter (HPF) and a low pass filter (LPF) so that the sensed electromagnetic signal is filtered leaving only the band of 500 MHz to 1.5 GHz. This results in primary noise cancellation.

Thereafter, the step S230 of converting the filtered electromagnetic wave signal into a digital signal is performed, and the converted digital signal is transferred to step S240.

Thereafter, the step of detecting and removing the commercial frequency synchronizing signal (S240) is performed. In step S240, the digital signal transmitted in the previous step S230 is compared with a high frequency signal of a commercial frequency. After the comparison is made, it is determined whether a high frequency signal of a commercial frequency exists in the digital signal. If it is determined that a high frequency signal of commercial frequency exists in the digital signal, the same part as the high frequency signal and the part considered to be a noise signal are removed from the digital signal. At this time, the signal to be removed includes an external noise generated during operation of the electric motor, discharge lamp, dust collector, arc welding machine. Thereafter, the digital signal from which the noise signal has been removed is transferred to step S250. On the other hand, if it is determined that there is no high frequency signal of the commercial frequency in the digital signal, the digital signal is transferred to step S250. As mentioned above, the digital signal transmitted from step S240 to step S250, i.e., through the foregoing process, from which the harmonic signal is removed or does not include it is referred to as a first filtering signal below.

Thereafter, the detecting and removing of the cellular phone signal (S250) is performed. In operation S250, the signal transmitted from operation S240, that is, the first filtering signal and the cellular phone signal stored in the database are compared. After the comparison is made, it is determined whether a communication data signal exists in the first filtering signal. As in step S240, when it is determined that the mobile phone signal is included in the first filtering signal, the mobile phone signal included in the first filtering signal is regarded as a noise signal and removed. Thereafter, the first filtering signal from which the cellular phone signal has been removed is transferred to step S260. On the other hand, if it is determined that the cellular phone signal does not exist in the first filtering signal, the first filtering signal is transferred to step S260. As mentioned above, the first filtering signal transmitted from step S250 to step S260, i.e., through the foregoing process, from which the cellular phone signal is removed or does not include it is referred to as a second filtering signal below.

Here, the detection steps performed in steps S240 and S250 use a hardware method, while the detection steps performed in step S260 below use a software method.

Then, the step of detecting and removing other noise signals (S260) is performed. In operation S260, a comparison between the signal transmitted from operation S250, that is, the second filtering signal, and a database stored in another external signal removal program is performed. As mentioned earlier, other external signal removal programs can detect other external signals, including electromagnetic signals that occur during breaker operation and when lightning strikes occur. As in the preceding steps S240 and S250, after the comparison is performed, it is determined whether other external signals exist in the second filtering signal. If it is determined that other external signals exist in the second filtering signal, the other external signals included in the second filtering signal are regarded as noise signals, and the other external signals are removed from the second filtering signal. Thereafter, the second filtering signal from which the other external signal has been removed is transferred to step S270. On the other hand, if it is determined that no other external signal exists in the second filtering signal, the second filtering signal is transferred to step S270. As mentioned above, the second filtering signal that is transferred from step S260 to step S270, that is, the cell phone signal is removed or does not include it, is referred to as a third filtering signal below.

In addition, the above-described detection steps (S240, S250, S260) are arranged in order of high frequency of noise through various experimental data. However, it should be understood that the order of these steps S240, S250, S260 may be arbitrarily changed.

Thereafter, the third filtering signal is transmitted to the external server through the communication unit (S270). The third filtering signal is a partial discharge signal that does not include a noise signal since the third filtering signal is a signal that has undergone the previous filtering steps. In addition, as described above, the third filtering signal is used to determine the type of partial discharge through an analysis method including PRPD and PRPS.

6 to 8, steps S240, S250, and S 260 included in the method for removing noise of the present invention will be described in more detail.

6 is a flowchart showing step S240 in more detail.

First, in step 241, a digital signal transmitted from step 230 is received. Thereafter, as described above, dozens of harmonic signal data are generated based on commercially used frequencies (50/60 Hz) (S242). Thereafter, the digital signal and the harmonic signal data are compared (S243), and it is determined whether harmonic signal data exists in the digital signal (S244). If it is determined in step S244 that the same part as the harmonic signal exists in the digital signal, the same part as the harmonic signal included in the digital signal, that is, the noise signal is removed. Thereafter, the digital signal from which the noise signal has been removed is transferred to the cellular phone signal detector (S245), and step S250 is performed. On the other hand, if it is determined that no harmonic signal exists in the digital signal, the digital signal is immediately transmitted to the mobile phone signal detection unit (S245), and step S250 is performed. As mentioned above, the harmonic signal is removed through the above process, or the digital signal that does not include the harmonic signal is referred to as the first filtering signal.

7 is a flowchart illustrating step S250 in more detail.

First, in step S251, a first filtering signal is received. Thereafter, the cellular phone signal stored in the database is acquired (S252). Here, the cellular phone signal stored in the database includes at least one of an outgoing signal, a call signal, and a data communication signal of the cellular phone. Thereafter, after comparing the first filtering signal with the mobile phone signal (S253), a step (S254) of determining whether the mobile phone signal is included in the first filtering signal is performed. In step S254, when it is determined that the mobile phone signal is included in the first filtering signal, the same part as the mobile phone signal, that is, removing the noise signal (S256) is performed in the first filtering signal. Thereafter, the first filtering signal from which the noise signal has been removed is transferred to the other external signal detector (S255), and step S260 is performed. On the other hand, if it is determined in step S254 that the mobile phone signal is not included in the first filtering signal, the first filtering signal is directly transmitted to the other external signal detection unit (S255), and step S260 is performed. As mentioned above, the first filtering signal that is removed or does not include the cellular phone signal through the foregoing process is referred to as the second filtering signal.

8 is a flowchart showing step S260 in more detail.

First, in step S261, a second filtering signal is received. Then, in step S262, other external signals are acquired from a database stored in the other external signal removing program. Here, the other external signal refers to the electromagnetic wave signal generated when the breaker operation or lightning occurs as mentioned above. Therefore, the other external signal removing program is a program capable of detecting each of these electromagnetic wave signals. Here, since the detailed description and example of this other external signal removal program have been described with reference to FIG. 4 above, the description thereof will be omitted. After comparing the second filtering signal with other external signals in step S263, it is determined whether other external signals exist in the second filtering signal (S264). If it is determined in step S264 that the other external signal exists in the second filtering signal, the same part as the other external signal in the second filtering signal, that is, the noise signal is removed (S266). Thereafter, the second filtering signal from which the noise signal has been removed is transmitted to the communication unit (S265) and transmitted to an external server. On the other hand, if it is determined that no other external signal is included in the second filtering signal, the second filtering signal is immediately transmitted to the communication unit (S265) and transmitted to the external server. As mentioned above, the second filtering signal from which the noise signal is removed or no noise signal is referred to as the third filtering signal.

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: partial discharge determination device 100: noise removing device
110: sensor unit 120: RF signal processing unit
130: commercial frequency synchronization signal detection unit
140: mobile phone signal detector 150: other external signal detector
160: communication unit 200: server

Claims (16)

Sensor unit for detecting the electromagnetic wave signal generated from the power device;
An RF signal processor for filtering the detected electromagnetic wave signal and converting the filtered electromagnetic wave signal into a digital signal;
A commercial frequency synchronization signal detector for generating a first filtering signal by removing the commercial frequency synchronization signal included in the digital signal;
A mobile phone signal detector for generating a second filtering signal by removing the mobile phone signal included in the first filtering signal;
An other external signal detector which generates a third filtering signal by removing other external signals included in the second filtering signal; And
And a communication unit which transmits the third filtering signal to a server which performs a partial discharge determination function. The method of claim 1,
The commercial frequency synchronization signal detector,
A synchronizing signal comparator for generating a harmonic signal of a commercial frequency, and then comparing at least one of phase, signal magnitude, and number of signals per cycle of the harmonic signal and the digital signal; And
And determining that the same portion as the harmonic signal exists in the digital signal, and including a synchronous signal filtering unit for removing the same portion from the digital signal and generating a first filtering signal. Device. The method of claim 1,
The mobile phone signal detection unit,
A mobile phone signal comparator for comparing the first filtering signal with a mobile phone signal including at least one of a mobile phone outgoing signal, a mobile phone call signal, and a mobile phone data communication signal included in a database; And
And a mobile phone signal filtering unit for removing the same part from the first filtering signal and generating a second filtering signal when it is determined that the same part as the mobile phone signal exists in the first filtering signal. Partial discharge determination device having. The method of claim 1,
The other external signal detector,
A miscellaneous signal comparator for comparing the second filtering signal with other signal data including a circuit breaker operation signal and a lightning generation signal included in the other external signal removing program; And
And a second signal filtering unit which removes the same part from the second filtering signal and generates a third filtering signal when it is determined that the same part as the other signal data exists in the second filtering signal. Partial discharge determination device having a. The method of claim 1,
The other external signal detector,
And the third filtering signal is generated using at least one of a circuit breaker operation signal comparison program and a lightning strike signal comparison program. The method of claim 1,
The RF signal processing unit,
Partial discharge determination device, characterized in that for filtering the detected signal existing outside the band of the predetermined lower limit and the upper limit. The method according to claim 6,
The predetermined lower limit is 500 MHz, and the predetermined upper limit is 1.5 GHz characterized in that the device. The method of claim 1,
The RF signal processing unit,
And at least one of a low pass filter (LPF) and a high pass filter (HPF). The method of claim 1,
The server comprises:
And analyzing the third filtering signal using an analysis method including at least one of a phase resolved pulse sequence (PRPS) and a phase resolved partial discharge (PRPD). Detecting an electromagnetic wave signal generated from the power device;
Filtering the sensed electromagnetic wave signal and converting the filtered electromagnetic wave signal into a digital signal;
Generating a first filtering signal by removing a commercial frequency synchronization signal included in the digital signal;
Generating a second filtering signal by removing a mobile phone signal included in the first filtering signal;
Generating a third filtering signal by removing other external signals included in the second filtering signal; And
And transmitting the third filtering signal to a server that performs a partial discharge determination function. The method of claim 10,
The generating of the first filtering signal may include:
Generating a harmonic signal of a commercial frequency, and comparing at least one of phase, signal magnitude, and number of signals per cycle of the harmonic signal and the digital signal; And
And if it is determined that the same portion as the harmonic signal exists in the digital signal, removing the same portion from the digital signal and generating a first filtering signal. The method of claim 10,
The generating of the second filtering signal may include:
Comparing the first filtering signal with a mobile phone signal including at least one of a mobile phone outgoing signal, a mobile phone call signal, and a mobile phone data communication signal included in a database; And
And if it is determined that the same portion as the cellular phone signal exists in the first filtering signal, removing the same portion from the first filtering signal and generating a second filtering signal. Discharge determination method. The method of claim 10,
The generating of the third filtering signal may include:
Comparing the second filtering signal with other signal data including a circuit breaker operation signal included in the external signal removing program and a lightning occurrence signal; And
And if it is determined that the same portion as the other signal data exists in the second filtering signal, removing the same portion from the second filtering signal and generating a third filtering signal. Partial discharge determination method. The method of claim 10,
The generating of the third filtering signal may include:
And generating the third filtering signal using at least one of a circuit breaker operation signal comparison program and a lightning strike signal comparison program. The method of claim 10,
Converting the filtered electromagnetic wave signal into a digital signal,
Partial discharge determination method characterized in that the filtering by the detected signal existing outside the band of the predetermined lower limit and the upper limit. The method of claim 10,
The server comprises:
And analyzing the third filtering signal using an analysis method including at least one of PRPS and PRPD.

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