KR20190102593A - Apparatus and method for detecting partial discharge - Google Patents

Abstract

According to various embodiments of the present invention, provided are a partial discharge detection apparatus and a method thereof. The partial discharge detection apparatus is configured to detect first electrical signals at two or more detection positions inside the power device, to detect second electrical signals external to the power device, to convert the first and second electrical signals from a time domain to a frequency domain, to remove a noise interval in which the intensity of the second electrical signals in the frequency domain is less than the intensity of the second electrical signal, to determine signal intervals in the first electrical signals, to convert the signal intervals from the frequency domain to the time domain, to detect partial discharge based on the signal intervals, and to compare the signal intervals to estimate a generation position of the partial discharge from the detection positions.

Description

Partial discharge detection device and method {APPARATUS AND METHOD FOR DETECTING PARTIAL DISCHARGE}

Various embodiments are directed to an apparatus and method for detecting partial discharge in a power device.

In general, partial discharge may occur inside the power device. That is, as the high electric field is concentrated on a specific part of the power device, partial discharge may occur in that part. For example, the partial discharge may include at least one of a corona discharge, a floating discharge, a surface discharge, or a void discharge. For this reason, deterioration may progress at the position where partial discharge occurs. In this way, as the partial discharge is repeatedly generated, a breakdown may occur in the power device. This may cause a failure of the power device.

An apparatus and method according to various embodiments of the present disclosure may detect a partial discharge in a power device. In addition, the apparatus and method according to various embodiments may estimate a location of a partial discharge. This makes it possible to appropriately process the partial discharge or the occurrence position of the partial discharge in the power device. As a result, a failure due to partial discharge in the power device can be prevented.

According to various embodiments of the present disclosure, a device may be configured to sense first electrical signals at at least two sensing positions inside a power device, and to sense a second electrical signal outside the power device, and the first electrical signals. A plurality of sensing at the sensing locations and a control unit configured to determine signal sections in which the strength of the first electrical signals exceeds the strength of the second electrical signal, and detect partial discharge based on the signal sections And a position estimator configured to estimate a generation position of the partial discharge based on a negative sensing time difference and a distance difference between the sensing positions and the generation position of the partial discharge.

According to various embodiments of the present disclosure, the sensing unit may be installed at each of the sensing positions, and configured to sense the first electrical signals, respectively, and the second electrical signal from the outside of the power device. It may include at least one second sensing unit configured to detect.

According to various embodiments of the present disclosure, the controller converts the first electrical signals and the second electrical signals from the time domain to the frequency domain, and the strength of the second electrical signals in the frequency domain is the strength of the second electrical signal. It may be further configured to remove the less than noise interval, determine the signal intervals in the first electrical signals, and convert the signal intervals from the frequency domain to the time domain.

According to an embodiment of the present disclosure, the position estimating unit calculates a time difference between detection times at which the intensity of the first electrical signals is highest in the time domain, and based on the time difference, a distance between the detection positions and the generation position. Calculate a distance difference between the two and based on the distance difference, and further estimate the occurrence position from the sensing positions.

According to another embodiment, the position estimating unit calculates a time difference between detection times in which the intensity of the first electrical signals exceeds a predetermined threshold in the time domain, and based on the time difference, The distance difference between the distances between the occurrence positions may be further calculated, and based on the distance difference, the distance may be further estimated from the detection positions.

According to various embodiments of the present disclosure, the method may further include a memory configured to store the first electrical signals and the second electrical signals.

According to various embodiments of the present disclosure, when the intensity of at least one of the first electrical signals exceeds a threshold value, the controller may correspond to the first electrical signals and the first unit period based on a current time. 2 may be further configured to extract the electrical signal.

According to various embodiments of the present disclosure, the controller may be further configured to transmit the estimated information including the identification information and the generation position of the partial discharge to the server.

According to an embodiment of the present disclosure, the controller may be further configured to receive guide information for processing the partial discharge from the server and output the guide information.

According to another embodiment, the controller may be further configured to determine guide information for processing the partial discharge and to output the guide information based on the identification information and the generation position of the partial discharge.

According to various methods, sensing first electrical signals at at least two sensing locations inside a power device, sensing a second electrical signal external to the power device, and detecting the first electrical signals and the second electrical signal; Converting from a time domain to a frequency domain, removing a noise section in which the strength of the second electrical signals is less than the strength of the second electrical signal in the frequency domain, and determining signal sections in the first electrical signals; Converting signal sections from the frequency domain to the time domain, detecting a partial discharge based on the signal sections, and comparing the signal sections to estimate a generation position of the partial discharge from the sensing locations. It may include a step.

According to various embodiments, the device may detect a partial discharge in the power device. In this case, the device may detect the partial discharge based on the first electrical signals sensed inside the power device. Here, the device may determine whether the intensity of the first electrical signals is changed by the partial discharge based on the second electrical signal sensed outside of the power device. The device may then estimate the location of the partial discharge in the power device. This allows the device to collect multiple discharge locations. Accordingly, the reliability of the detection result for the partial discharge in the apparatus can be improved. The device may also send the estimated information to the server. This enables the construction and management of a database related to partial discharge in the server.

1 is a block diagram illustrating a system in accordance with various embodiments.
2 is a block diagram illustrating an apparatus according to various embodiments.
3 is a flowchart illustrating a method in accordance with various embodiments.
4 is a flowchart illustrating an electrical signal processing operation of FIG. 3.
5 and 6 are exemplary diagrams for describing an electrical signal processing operation of FIG. 3.
FIG. 7 is a flowchart illustrating an operation of estimating a generation position of partial discharge in FIG. 3.
FIG. 8 is an exemplary diagram for describing an operation of estimating a generation position of partial discharge in FIG. 3.
FIG. 9 is a flowchart illustrating an operation of providing estimation information for partial discharge in FIG. 3.
FIG. 10 is a flowchart illustrating an operation of providing estimation information on partial discharge in FIG. 3.

Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings. However, this is not intended to limit the techniques described in this document to specific embodiments, but should be understood to cover various modifications, equivalents, and / or alternatives. In connection with the description of the drawings, similar reference numerals may be used for similar components.

In this document, expressions such as “having”, “may have”, “comprises” or “can include” refer to the presence of a corresponding feature, such as a component such as a numerical value, a function, an action or a part, It does not exclude the presence of additional features.

Expressions such as "first" or "second" as used herein may modify various components in any order and / or importance, and are only used to distinguish one component from another. It does not limit the components.

1 is a block diagram illustrating a system 100 in accordance with various embodiments.

Referring to FIG. 1, a system 100 according to various embodiments may include a power device 110 and a server 120. The power device 110 and the server 120 may communicate with each other. To this end, the power device 110 and the server 120 may be connected by wire or wirelessly.

In addition, the partial discharge detection device 111 in the power device 110 may communicate with the server 120. To this end, the partial discharge detection device 111 and the server 120 may be connected by wire or may be wirelessly connected.

The power device 110 may represent various devices and facilities. For example, the power device 110 may include at least one of a breaker or a transformer. At this time, in the power device 110, partial discharge may occur. That is, as the high electric field is concentrated on a specific portion of the power device 110, partial discharge may occur in the portion. For example, the partial discharge may include at least one of corona discharge, floating discharge, creepage discharge or void discharge. For this reason, deterioration may progress at the position where partial discharge occurs. As a result, as the partial discharge is repeatedly generated, dielectric breakdown may occur in the power device 110. This may cause a failure of the power device 110.

According to various embodiments, the power device 110 may include a partial discharge detection device 111 for detecting partial discharge. The partial discharge detection device 111 may detect the partial discharge based on the first electrical signals detected inside the power device 110. The detection of the partial discharge may be performed by acquiring the first electrical signal (electromagnetic signal) as a partial discharge signal, converting it into a detection signal, and outputting the detected signal.

In this case, the partial discharge detection device 111 may determine whether the intensity of the first electrical signals is changed by the partial discharge, based on the second electrical signal sensed from the outside of the power device 110. In addition, the partial discharge detection device 111 may estimate a generation position of the partial discharge in the power device 110. Through this, the partial discharge detection device 111 may collect a plurality of discharge positions. Accordingly, the reliability of the detection result of the partial discharge in the partial discharge detection device 111 can be improved. In addition, the partial discharge detection device 111 may provide estimation information about the partial discharge. For example, the estimation information may include at least one occurrence position in response to the identification information of the partial discharge. The identification telegram may be identification information indicating any one of corona discharge, floating discharge, creepage discharge or void discharge, and may also include other identification information such as a generation time and a target (such as a booth bar). In this case, the partial discharge detection device 111 may transmit the estimated information to the server 120.

The server 120 may include a database related to partial discharge for each power device 110. In this case, the server 120 may manage the database based on the combination of the power device 110, the identification information of the partial discharge, and the generation position. Here, the database may include at least any one of a failure case of the power device 110 or guide information for processing the partial discharge in the power device 110 according to a combination of the power device 110, the identification information of the partial discharge, and the occurrence position. You can save one. When receiving the estimation information on the partial discharge from the partial discharge detection device 111, the server 120 may update the database based on the estimation information. Here, the server 120 may transmit the guide information to at least one of the manager of the power device 110 or the partial discharge detection device 111 in response to the estimation information.

FIG. 2 is a block diagram illustrating an apparatus (111, 200 of FIG. 1) according to various embodiments.

2, the apparatuses 111 and 200 according to various embodiments may include a communication unit 210, an interface unit 220, a detector 230, a memory 240, and a controller 250. have.

The communication unit 210 may communicate with an external device. In this case, the communication unit 210 may perform communication in various communication schemes. Here, the communication unit 210 may communicate by wire, or may communicate wirelessly. For example, the external device may include at least one of a server (120 of FIG. 1), a personal computer (PC), a notebook, a wearable device, or a smart phone. have.

The interface unit 220 may interface with the power device 110 of FIG. 1. In this case, the interface unit 220 may interface with at least one of the input unit and the output unit of the power device 110. Here, the interface unit 220 may receive a command for controlling the devices 111 and 200 input through the input unit of the power device 110. The interface unit 220 may output data to an output unit of the power device 110, for example, a display unit or an audio reproduction unit.

The detector 230 may detect an electrical signal from the power device 110. For example, the detector 230 may include at least one of an ultra high frequency (UHF) sensor or a high frequency current transformer (HFCT) sensor. In this case, the electrical signal may include at least two first electrical signals sensed inside the power device 110 and at least one second electrical signal sensed outside the power device 110. To this end, the detector 230 may include at least two first detectors 231 and at least one second detector 233.

The first detectors 231 may detect first electrical signals inside the power device 110, respectively. To this end, the first sensing units 231 may be installed in a plurality of sensing positions distributed in the power device 110. In this case, each first sensing unit 231 may detect each first electrical signal from electromagnetic waves generated inside the power device 110. In addition, when partial discharge occurs in the power device 110, rapid rises in the strength of the first electrical signals may occur.

The second detector 233 may detect the second electrical signal from the outside of the power device 110. For this purpose, the second detector 233 may be installed outside the power device 110. In this case, the second detector 233 may detect the second electrical signal from electromagnetic waves existing outside the power device 110. Here, the second electrical signal may be a noise signal of the air. In addition, due to external factors, a sudden increase in the strength of the second electrical signal may occur.

The memory 240 may store programs for operating the devices 111 and 200. In this case, the memory 240 may store a program for detecting the partial discharge in the power device 110 and estimating a location of the partial discharge. The memory 240 may store data generated while executing programs. In addition, the memory 240 may store an electrical signal sensed by the detector 230. At this time, the memory 240 may store the electrical signal for a predetermined period from the detection time of the electrical signal. That is, when a predetermined period elapses from the detection time, the electrical signal may be deleted from the memory 240.

The controller 250 may control overall operations of the devices 111 and 200. In this case, the controller 250 may detect a partial discharge generated by the power device 110. Here, the controller 250 may determine the partial discharge from the electrical signal detected by the detector 230. The controller 250 may estimate a location of the partial discharge in the power device 110. Through this, the controller 250 may collect a plurality of discharge positions. In addition, the controller 250 may provide estimation information on the partial discharge. For example, the estimation information may include at least one occurrence position in response to the identification information of the partial discharge. Here, the controller 250 may output the estimated information through the interface unit 220. The controller 250 may transmit the estimated information to the server 120 through the communicator 210. To this end, the controller 250 may include a determiner 251 and a position estimator 253.

The determiner 251 may detect the partial discharge based on the first electrical signals. At this time, the determination unit 251 may determine whether the intensity of the first electrical signals is changed by partial discharge or by an external factor based on the second electrical signal. The determination unit 251 may identify the partial discharge.

The position estimator 253 may compare the first electrical signals to estimate a generation position of the partial discharge in the power device 110. In this case, the position estimator 253 may calculate a time difference between detection times when the intensity of the first electrical signals is the highest, or a time difference between detection times when the intensity of the first electrical signals exceeds a predetermined threshold. The position estimator 253 may calculate a distance difference between the distances between the sensing positions and the generation position based on the time difference. In addition, the position estimator 253 may estimate the occurrence position from the sensing positions based on the distance difference.

3 is a flowchart illustrating a method in accordance with various embodiments.

Referring to FIG. 3, the method according to various embodiments of the present disclosure may start from the sensing unit 230 of FIG. 2 collecting electrical signals in step 311. That is, the detector 230 may continue to detect the electrical signal. In this case, the first sensing units 231 of FIG. 2 may sense the first electrical signals at sensing positions inside the power device 110 of FIG. 1. Here, each first sensing unit 231 may detect each first electrical signal from electromagnetic waves generated inside the power device 110. In addition, the second detector 233 of FIG. 2 may detect the second electrical signal from the outside of the power device 110. Here, the second detector 233 may detect a second electrical signal from electromagnetic waves existing outside the power device 110. For example, the second electrical signal may be a noise signal in the air. In addition, the detector 230 may store an electrical signal in the memory 240 (see FIG. 2).

Next, if the intensity of the electrical signal exceeds a predetermined threshold, the control unit 250 of FIG. 2 may detect this in step 313. In this case, if the intensity of at least one of the first electrical signals exceeds a threshold value, the controller 250 may detect this. This is because, when partial discharge occurs in the power device 110, sharp rises in the intensity of the first electrical signals may occur. Thereafter, the controller 250 may process an electrical signal in step 315. In this case, the controller 250 may process the first electrical signals based on the second electrical signal. Here, the controller 250 may divide each first electrical signal into a signal section and a noise section, and remove the noise section from each first electrical signal. According to an embodiment, the controller 250 may process an electrical signal as shown in FIG. 4.

4 is a flowchart illustrating an electrical signal processing operation of FIG. 3. 5 and 6 are exemplary diagrams for describing an electrical signal processing operation of FIG. 3.

Referring to FIG. 4, the controller 250 extracts an electrical signal in step 411. The electrical signal may indicate a change in intensity with time, and may include an intensity for each sensing time. That is, the electrical signal may be represented in the time domain. In this case, the controller 250 may extract the first electrical signals and the second electrical signals from the memory 240 in response to a predetermined unit period based on the current time. Here, the current time is a time when at least one of the first electrical signals exceeds a threshold, and may indicate a detection time of at least one of the first electrical signals. For example, the unit period may be determined from 1 minute to 2 minutes based on the current time.

Next, the controller 250 may convert the electrical signal from the time domain to the frequency domain in step 413. That is, the electrical signal may be represented in the frequency domain. In this case, as illustrated in FIG. 5, the controller 250 may represent each of the first electrical signal and the second electrical signal as an overlay in the frequency domain. Here, at each frequency, the strength of the first electrical signal and the strength of the second electrical signal can be expressed. For example, the strength of the first electrical signal may be represented by a thick line, and the strength of the second electrical signal may be represented by a thin line.

Next, the controller 250 may remove the noise section from the electrical signal in step 415. In this case, the controller 250 may compare each of the first electrical signal and the second electrical signal, and divide each first electrical signal into a signal section and a noise section. Here, the controller 250 may determine whether the intensity of the first electrical signal exceeds the intensity of the second electrical signal in response to each frequency. If the strength of the first electrical signal exceeds the strength of the second electrical signal, the controller 250 may determine the corresponding frequency as the signal period. If the intensity of the first electrical signal is less than or equal to the strength of the second electrical signal, the controller 250 may determine the corresponding frequency as the noise section. Thereafter, if a noise section exists in at least one of the first electrical signals, the controller 250 may remove the noise section from the first electrical signals. As a result, signal intervals may remain in the first electrical signals.

Next, the controller 250 may convert the signal section from the frequency domain to the time domain in step 417. In this case, if a signal section exists in at least one of the first electrical signals, the controller 250 may convert the signal section from the frequency domain to the time domain. In this way, signal sections may be represented in time domains, respectively. In this case, as illustrated in FIG. 6, the controller 250 may express signal sections of the first electrical signals in the time domain.

Next, the controller 250 may determine the partial discharge from the electrical signal in step 317. In this case, the controller 250 may determine whether the intensity of the first electrical signals is changed by partial discharge or by external factors. That is, when all signal sections of the first electrical signals exist, the controller 250 may determine that the intensity of the first electrical signals is changed by partial discharge. Alternatively, when at least one signal period among the first electrical signals does not exist, the controller 250 may determine that the strength of the first electrical signals is changed by an external factor. If it is determined that the intensity of the first electrical signals is changed by the partial discharge, the controller 250 may analyze the signal periods of the first electrical signals to identify the partial discharge. In this way, the controller 250 may determine the identification information of the partial discharge. Herein, the controller 250 may determine any one identification information of corona discharge, floating discharge, creepage discharge or void discharge in response to the partial discharge.

According to an embodiment, the controller 250 may identify the partial discharge based on a phase resolved partial discharge (PRPD) analysis technique. Herein, the controller 250 may rearrange the signal sections in phases of an AC 60 Hz period to determine a pattern of partial discharge. The controller 250 may compare the pattern of the partial discharge with at least one pattern stored in advance. Here, the memory 240 may store at least one pattern among corona discharge, floating discharge, creepage discharge, and void discharge. As a result, when the pattern of the partial discharge matches the previously stored pattern, the controller 250 may identify the partial discharge.

In operation 319, the controller 250 may determine whether the partial discharge is identified. That is, the controller 250 may determine whether the identification information of the partial discharge is determined. In this case, if it is determined in step 319 that the partial discharge is not identified, the controller 250 may return to step 311. The controller 250 may repeat steps 311 to 319. That is, the controller 250 may repeat steps 311 to 319 until the partial discharge is identified. On the other hand, if it is determined in step 319 that the partial discharge is identified, the controller 250 may estimate the location of the partial discharge in the power device 110 in step 321. In this case, the controller 250 may compare the signal periods and estimate the generation position of the partial discharge from the sensing positions in the power device 110. According to an embodiment, the controller 250 may estimate a location of the partial discharge as shown in FIG. 7.

FIG. 7 is a flowchart illustrating an operation of estimating a generation position of partial discharge in FIG. 3. FIG. 8 is an exemplary diagram for describing an operation of estimating a generation position of partial discharge in FIG. 3.

Referring to FIG. 7, in operation 711, the controller 250 may calculate a time difference between sensing times at sensing positions. In this case, as shown in FIG. 6, when signal sections of the first electrical signals are expressed in the time domain, the controller 250 may calculate a time difference between detection times of the signal sections. Here, the controller 250 may detect the detection times having the highest intensity of the first electrical signals in the signal periods, and calculate a time difference between the detection times. Alternatively, the controller 250 may detect sensing times in which signal strengths of the first electrical signals exceed a predetermined threshold in signal intervals, and calculate a time difference between the sensing times. In operation 713, the controller 250 may calculate a distance difference between the distances between the sensing positions and the generation position. At this time, the controller 250 may calculate the distance difference based on the time difference. In this way, the controller 250 may estimate the occurrence position from the sensing positions in step 715. In this case, the controller 250 may estimate a generation position based on the distance difference. Here, the controller 250 may estimate the generation position as a coordinate value.

로 산출될 수 있고, μ는 전력 기기(110) 내 매질의 투자율을 나타내며, ε는 전력 기기(110) 내 매질의 유전율을 나타낼 수 있다. 한편, 제 1 감지부(231)들의 감지 위치들이 S1(0, 0, 0), S2(d, 0, 0), S3(i, j, 0) 및 S4(l, m, n)일 수 있다. 이 때 부분 방전의 발생 위치를 P(x, y, z)의 변수로 가정하면, 제어부(250)는 하기 [수학식 2]와 같이 각각의 감지 위치와 발생 위치 사이의 거리를 산출한 다음, 하기 [수학식 3]과 같이 거리차를 산출할 수 있다. 이를 통해, 하기 [수학식 1]에 하기 [수학식 3]을 대입함에 따라, 제어부(250)가 발생 위치, 즉 P(x, y, z)를 산출할 수 있다. For example, as illustrated in FIG. 8, four first sensing units 231 may be installed in the power device 110. In any two of the first sensing units 231, a product of a time difference and a propagation speed of partial discharge may represent a distance difference as shown in Equation 1 below. At this time, the propagation speed of the partial discharge may be equally applied to the first sensing units 231. Here, the propagation speed of the partial discharge is, for example

It can be calculated as, μ represents the permeability of the medium in the power device 110, ε may represent the dielectric constant of the medium in the power device 110. Meanwhile, the sensing positions of the first sensing units 231 may be S1 (0, 0, 0), S2 (d, 0, 0), S3 (i, j, 0) and S4 (l, m, n). have. In this case, assuming that the generation position of the partial discharge is a variable of P (x, y, z), the controller 250 calculates the distance between each detection position and the generation position as shown in Equation 2 below. Distance difference can be calculated as shown in Equation 3 below. Through this, by substituting Equation 3 into Equation 1, the controller 250 may calculate a generation position, that is, P (x, y, z).

Here, Δt12 represents the time difference of detection times in S1 and S2, Δt13 represents the time difference of detection times in S1 and S3, Δt14 represents the time difference of detection times in S1 and S4, and V represents the propagation speed of the partial discharge. , r1 represents the distance between S1 and P, r2 represents the distance between S2 and P, r3 represents the distance between S3 and P, r4 may represent the distance between S4 and P.

Subsequently, the controller 250 may determine whether or not the estimation of the location of the partial discharge may be terminated in step 323. At this time, the controller 250 may determine whether the number of times where the occurrence position is estimated reaches a predetermined number. If it is determined that the number of times that the occurrence position is estimated does not reach the predetermined number of times, the controller 250 may return to step 311. The controller 250 may repeat steps 311 to 323. That is, the controller 250 may repeatedly perform steps 311 to 323 until the number of times where the occurrence position is estimated reaches a predetermined number. Through this, the controller 250 may collect a plurality of discharge positions. That is, the controller 250 may determine a distribution range of the discharge positions in the power device 110. On the other hand, if it is determined that the number of times where the occurrence position is estimated reaches a predetermined number, the controller 250 may determine that the estimation of the occurrence position may be finished.

Finally, if it is determined that the estimation of the location of the partial discharge may be completed in step 323, the controller 250 may provide the estimation information about the partial discharge in step 325. For example, the estimation information may include at least one occurrence position in response to the identification information of the partial discharge. In this case, the controller 250 may output the estimated information through the interface unit 220. The controller 250 may output the estimated information as at least one of display data and audio data. The controller 250 may transmit the estimated information to the server 120 of FIG. 1 through the communication unit 210. In this way, the controller 250 may terminate the method according to various embodiments. According to an embodiment, the controller 250 may provide estimation information as shown in FIG. 9. According to another embodiment, the controller 250 may provide estimation information as shown in FIG. 10.

FIG. 9 is a flowchart illustrating an operation of providing estimation information for partial discharge in FIG. 3.

Referring to FIG. 9, the controller 250 may search for guide information for processing partial discharge based on the estimated information in step 911. Here, the memory 240 may store the guide information according to a combination of the identification information of the partial discharge and the generation position. That is, the controller 250 may detect the guide information from the memory 240. The controller 250 may output guide information in step 913. At this time, the controller 250 may output the guide information together with the estimated information. Here, the controller 250 may output the guide information as at least one of display data or audio data. Alternatively, when the guide information includes contact information of the manager, the controller 250 may transmit the guide information to the manager based on the contact information.

FIG. 10 is a flowchart illustrating an operation of providing estimation information on partial discharge in FIG. 3.

Referring to FIG. 10, the controller 250 may transmit estimation information to the server 120 in step 1011. Thereafter, the controller 250 may receive the guide information from the server 120 in step 1013. The controller 250 may output the guide information in step 1015. At this time, the controller 250 may output the guide information together with the estimated information. Here, the controller 250 may output the guide information as at least one of display data or audio data. Alternatively, when the guide information includes contact information of the manager, the controller 250 may transmit the guide information to the manager based on the contact information.

According to various embodiments of the present disclosure, the devices 111 and 200 may detect the partial discharge in the power device 110. In this case, the devices 111 and 200 may detect the partial discharge based on the first electrical signals sensed inside the power device 110. Here, the devices 111 and 200 may determine whether the intensity of the first electrical signals is changed by the partial discharge, based on the second electrical signals sensed outside of the power device 110. In addition, the devices 111 and 200 may estimate a location of the partial discharge in the power device 110. This allows the devices 111 and 200 to collect a plurality of discharge locations. Accordingly, the reliability of the detection result for the partial discharge in the devices 111 and 200 can be improved. In addition, the devices 111 and 200 may transmit estimation information to the server 120. Through this, it is possible to build and manage the database related to the partial discharge in the server 120.

The terminology used herein is for the purpose of describing particular embodiments only and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. The terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. Among the terms used in this document, terms defined in the general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related art, and ideally or excessively formal meanings are not clearly defined in this document. Not interpreted as In some cases, even if terms are defined in the specification, they may not be interpreted to exclude embodiments of the present disclosure.

100 systems
110 power appliance 120 server
111, 200 device 210 communication unit
220 Interface 230 Sensor
231 First detector 233 Second detector
240 memory 250 controller
251 Determining unit 253 Position estimating unit

Claims (10)

An apparatus for detecting partial discharge in a power device,
A plurality of sensing units configured to sense first electrical signals at at least two sensing positions inside the power device and to sense a second electrical signal outside the power device;
A controller configured to determine signal sections in which the strength of the first electrical signals exceeds the strength of the second electrical signal in the first electrical signals, and detect a partial discharge based on the signal sections; And
A position estimating unit configured to estimate a generation position of the partial discharge from the sensing positions based on a sensing time difference of the plurality of sensing units at the sensing positions and a distance difference between the sensing positions and the occurrence position of the partial discharge. Containing device. The method of claim 1, wherein the detection unit,
At least two first sensing units respectively installed at the sensing positions and configured to sense the first electrical signals, respectively; And
And at least one second sensing unit configured to sense the second electrical signal outside of the power device. The method of claim 1, wherein the control unit,
Converting the first electrical signals and the second electrical signals from a time domain to a frequency domain,
Determining the signal intervals in the first electrical signals by removing a noise period in which the strength of the second electrical signals is less than the strength of the second electrical signal in the frequency domain,
And convert the signal intervals from the frequency domain to the time domain. The method of claim 3, wherein the position estimating unit,
Calculating a time difference between sensing times at which the intensity of the first electrical signals is highest in the time domain;
Based on the time difference, calculating a distance difference between the distances between the sensing positions and the generation position,
Based on the distance difference, further configured to estimate the occurrence position from the sensing positions. The method of claim 3, wherein the position estimating unit,
Calculating a time difference between sensing times in which the intensity of the first electrical signals exceeds a predetermined threshold in the time domain,
Based on the time difference, calculating a distance difference between the distances between the sensing positions and the generation position,
Based on the distance difference, further configured to estimate the occurrence position from the sensing positions. The method of claim 3, wherein
Further comprising a memory configured to store the first electrical signals and the second electrical signal,
The control unit,
And if the intensity of at least one of the first electrical signals exceeds a threshold value, the apparatus further configured to extract the first electrical signals and the second electrical signal in response to a predetermined unit period based on a current time. . The method of claim 1, wherein the control unit,
And send estimated information including the identification information of the partial discharge and a location of occurrence to a server. The method of claim 7, wherein the control unit,
Receiving guide information for processing the partial discharge from the server,
And further configured to output the guide information. The method of claim 1, wherein the control unit,
Determining guide information for the processing of the partial discharges, based on the identification information and the occurrence position of the partial discharges,
And further configured to output the guide information. A method for detecting partial discharge in a power device,
Sensing first electrical signals at at least two sensing locations inside the power device and sensing a second electrical signal outside the power device;
Converting the first electrical signals and the second electrical signals from a time domain to a frequency domain;
Determining signal intervals in the first electrical signals by removing a noise interval in which the strength of the second electrical signals is less than the strength of the second electrical signal in the frequency domain;
Converting the signal sections from the frequency domain to the time domain;
Detecting a partial discharge based on the signal intervals; And
Comparing the signal intervals, and estimating a generation position of the partial discharge from the sensing positions.

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