KR20210129003A - Apparatus and method for detecting partial discharge in gas insulated switchgear - Google Patents

Abstract

According to an embodiment of the present invention, a device for detecting partial discharge in a gas insulated switchgear includes: a sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear to detect electromagnetic waves; a high-frequency switch unit for controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determination unit which receives the electromagnetic wave signal from the high-frequency switch unit and analyzes a pattern of the electromagnetic wave signal to determine whether a partial discharge has occurred in the gas insulated switchgear; and a generation location calculation unit which receives the electromagnetic wave signal from the high-frequency switch unit and calculates a generation location of the electromagnetic wave detected by the sensor unit using an electromagnetic wave detection time point of the sensor unit. Therefore, the partial discharge occurrence determination and partial discharge occurrence location estimation can be performed together.

Description

{Apparatus and method for detecting partial discharge in gas insulated switchgear}

The present invention relates to a gas insulated switchgear partial discharge detection apparatus and method.

A gas insulated switchgear (GIS) is installed in a power plant or substation, and a large current of high voltage flows to perform switching operation. Partial discharge (PD) may occur in such a gas insulated switchgear as a precursor to failure due to an internal abnormality. Partial discharge may cause insulation breakdown of gas insulated switchgear, and may cause great disruption in the power supply of power plants or substations. Therefore, it is important to detect the partial discharge generated in the gas insulation switchgear and prevent accidents such as insulation breakdown.

Laid-Open Patent Publication No. 10-2016-0046014

An embodiment of the present invention provides an apparatus and method for detecting partial discharge of a gas insulated switchgear capable of both determining the occurrence of a partial discharge and estimating the location of the partial discharge.

A gas insulated switchgear partial discharge detection apparatus according to an embodiment of the present invention includes: a sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear to detect electromagnetic waves; a high-frequency switch unit for controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determination unit receiving the electromagnetic wave signal from the high frequency switch unit and analyzing a pattern of the electromagnetic wave signal to determine whether a partial discharge has occurred in the gas insulated switchgear; and a generation position calculation unit that receives the electromagnetic wave signal from the high-frequency switch unit and calculates a generation position of the electromagnetic wave sensed by the sensor unit using the electromagnetic wave detection time points of the sensor unit.

에 감쇄계수 α와 시점 차이값 △를 적용하여 상기 센서부에 의해 감지된 전자기파의 발생위치를 계산하고, 상기 복수의 전자기파 센서의 제1 조합에 포함된 전자기파 센서들의 감지 시점 차이값과, 제2 조합에 포함된 전자기파 센서들의 감지 시점 차이값을 이용하여 상기 감쇄계수 α를 계산하고, 제3 조합에 포함된 전자기파 센서들의 감지 시점 차이값을 상기 △에 적용하고, 여기서, d는 상기 복수의 전자기파 센서 중 하나와 상기 전자기파의 발생위치간의 거리이고, D는 상기 복수의 전자기파 센서 중 하나와 다른 하나간의 거리이고, C는 광속도이다.Here, the number of the plurality of electromagnetic wave sensors is at least three, and the generation position calculation unit is represented by the following equation:

by applying the attenuation coefficient α and the time difference value △ to calculate the generation position of the electromagnetic wave sensed by the sensor unit, the detection time difference value of the electromagnetic wave sensors included in the first combination of the plurality of electromagnetic wave sensors, and the second The attenuation coefficient α is calculated using the detection timing difference value of the electromagnetic wave sensors included in the combination, and the detection timing difference value of the electromagnetic wave sensors included in the third combination is applied to the △, where d is the plurality of electromagnetic waves is a distance between one of the sensors and a location where the electromagnetic wave is generated, D is a distance between one of the plurality of electromagnetic wave sensors and the other, and C is the speed of light.

A gas insulated switchgear partial discharge detection apparatus according to another embodiment of the present invention includes: a sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear to detect electromagnetic waves; a high-frequency switch unit for controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determination unit receiving the electromagnetic wave signal from the high frequency switch unit and analyzing a pattern of the electromagnetic wave signal to determine whether a partial discharge has occurred in the gas insulated switchgear; and a generation position calculation unit that receives the electromagnetic wave signal from the high-frequency switch unit and calculates a generation position of the electromagnetic wave sensed by the sensor unit using the electromagnetic wave detection time points of the sensor unit.

Here, the gas insulated switchgear includes first, second, and third circuit breakers, and the sensor unit is disposed between a first electromagnetic wave sensor disposed on one side of the first circuit breaker and between the first circuit breaker and the second circuit breaker. It includes a second electromagnetic wave sensor to be formed, a third electromagnetic wave sensor disposed between the second circuit breaker and the third circuit breaker, and a fourth electromagnetic wave sensor disposed on one side of the third circuit breaker.

에 감쇄계수 α와 시점 차이값 △를 적용하여 상기 센서부에 의해 감지된 전자기파의 발생위치를 계산하고, 상기 제1, 제2, 제3 및 제4 전자기파 센서 중 가장 먼저 전자기파를 감지한 전자기파 센서와 인접 전자기파 센서의 감지 시점 차이값을 상기 △에 적용하고, 상기 △에 관여되지 않은 전자기파 센서 각각과 상기 △에 관여된 전자기파 센서의 감지 시점 차이값들을 이용하여 상기 감쇄계수 α를 계산하고, 여기서, d는 상기 제1 내지 제4 전자기파 센서 중 하나와 상기 전자기파의 발생위치간의 거리이고, D는 상기 제1 내지 제4 전자기파 센서 중 하나와 다른 하나간의 거리이고, C는 광속도이다.And, the occurrence position calculation unit is represented by the following formula:

The electromagnetic wave sensor that first detects the electromagnetic wave among the first, second, third, and fourth electromagnetic wave sensors by calculating the generation position of the electromagnetic wave sensed by the sensor unit by applying the attenuation coefficient α and the time difference value △ to and the detection timing difference value of the adjacent electromagnetic wave sensor is applied to the Δ, and the attenuation coefficient α is calculated using the detection timing difference values of the electromagnetic wave sensor not involved in the Δ and the detection timing difference values of the electromagnetic wave sensor involved in the Δ, wherein , d is a distance between one of the first to fourth electromagnetic wave sensors and a location where the electromagnetic wave is generated, D is a distance between one of the first to fourth electromagnetic wave sensors and the other, and C is the speed of light.

A gas insulated switchgear partial discharge detection method according to an embodiment of the present invention includes the steps of setting an operation mode to one of a first mode and a second mode; Receiving electromagnetic wave signals from a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear; analyzing a pattern of the electromagnetic wave signal when the set operation mode is the first mode to determine whether partial discharge of the gas insulated switchgear occurs; And when the set operation mode is the second mode, calculating the position where the electromagnetic wave is generated in the gas insulated switch using the electromagnetic wave signal detection time points of the plurality of electromagnetic wave sensors.

에 감쇄계수 α와 시점 차이값 △를 적용하여 상기 복수의 전자기파 센서에 의해 감지된 전자기파의 발생위치를 계산하고, 상기 복수의 전자기파 센서의 제1 조합에 포함된 전자기파 센서들의 감지 시점 차이값과, 제2 조합에 포함된 전자기파 센서들의 감지 시점 차이값을 이용하여 상기 감쇄계수 α를 계산하고, 제3 조합에 포함된 전자기파 센서들의 감지 시점 차이값을 상기 △에 적용하고, 여기서, d는 상기 복수의 전자기파 센서 중 하나와 상기 전자기파의 발생위치간의 거리이고, D는 상기 복수의 전자기파 센서 중 하나와 다른 하나간의 거리이고, C는 광속도이다. Here, the number of the plurality of electromagnetic wave sensors is at least three, and the step of calculating the position where the electromagnetic wave is generated includes the following equation:

by applying the attenuation coefficient α and the time difference value △ to calculate the generation position of the electromagnetic wave sensed by the plurality of electromagnetic wave sensors, and the detection time difference value of the electromagnetic wave sensors included in the first combination of the plurality of electromagnetic wave sensors; The attenuation coefficient α is calculated using the detection timing difference value of the electromagnetic wave sensors included in the second combination, and the detection timing difference value of the electromagnetic wave sensors included in the third combination is applied to the Δ, where d is the plurality of is the distance between one of the electromagnetic wave sensors and the location of the electromagnetic wave, D is the distance between one of the plurality of electromagnetic wave sensors and the other, and C is the speed of light.

A gas insulated switchgear partial discharge detection method according to another embodiment of the present invention comprises the steps of setting an operation mode to one of a first mode and a second mode; Receiving electromagnetic wave signals from a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear; analyzing a pattern of the electromagnetic wave signal when the set operation mode is the first mode to determine whether partial discharge of the gas insulated switchgear occurs; And when the set operation mode is the second mode, calculating the position where the electromagnetic wave is generated in the gas insulated switch using the electromagnetic wave signal detection time points of the plurality of electromagnetic wave sensors.

The gas insulated switchgear includes first, second and third circuit breakers, and the plurality of electromagnetic wave sensors includes a first electromagnetic wave sensor disposed on one side of the first circuit breaker, and the first circuit breaker and the second circuit breaker. A second electromagnetic wave sensor disposed therebetween, a third electromagnetic wave sensor disposed between the second circuit breaker and the third circuit breaker, and a fourth electromagnetic wave sensor disposed on one side of the third circuit breaker.

에 감쇄계수 α와 시점 차이값 △를 적용하여 상기 복수의 전자기파 센서에 의해 감지된 전자기파의 발생위치를 계산하고, 상기 제1, 제2, 제3 및 제4 전자기파 센서 중 가장 먼저 전자기파를 감지한 전자기파 센서와 인접 전자기파 센서의 감지 시점 차이값을 상기 △에 적용하고, 상기 △에 관여되지 않은 전자기파 센서 각각과 상기 △에 관여된 전자기파 센서의 감지 시점 차이값들을 이용하여 상기 감쇄계수 α를 계산하고, 여기서, d는 상기 제1 내지 제4 전자기파 센서 중 하나와 상기 전자기파의 발생위치간의 거리이고, D는 상기 제1 내지 제4 전자기파 센서 중 하나와 다른 하나간의 거리이고, C는 광속도이다.Here, the step of calculating the position where the electromagnetic wave is generated is expressed by the following equation:

by applying the attenuation coefficient α and the time difference value Δ to calculate the generation position of the electromagnetic wave detected by the plurality of electromagnetic wave sensors, and first detect the electromagnetic wave among the first, second, third and fourth electromagnetic wave sensors Applying the detection timing difference between the electromagnetic wave sensor and the adjacent electromagnetic wave sensor to the Δ, and calculating the attenuation coefficient α using the detection timing difference values of each of the electromagnetic wave sensors not involved in the △ and the electromagnetic wave sensor involved in the △ , where d is a distance between one of the first to fourth electromagnetic wave sensors and a location where the electromagnetic wave is generated, D is a distance between one of the first to fourth electromagnetic wave sensors and the other, and C is the speed of light.

A gas insulated switchgear partial discharge detection apparatus and method according to an embodiment of the present invention can perform partial discharge occurrence determination and partial discharge occurrence location estimation together, and perform rapid integrated detection of intermittent partial discharge. can

In addition, the apparatus and method for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention can organically link partial discharge occurrence determination and partial discharge occurrence location estimation with each other, and can be implemented by simplifying the integrated detection function for partial discharge and can provide convenience to the management of gas insulated switchgear managers.

In addition, the apparatus and method for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention can accurately estimate the location of the partial discharge by reflecting the attenuation of electromagnetic waves generated according to the partial discharge.

In addition, the apparatus and method for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention enable a gas insulated switchgear manager to intuitively determine the location of the partial discharge.

1 is a view showing an apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention.
2 is a diagram specifically illustrating an apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention.
3 is a view showing the arrangement of the electromagnetic wave sensor.
4 is a view showing the position of the partial discharge detected by the electromagnetic wave sensor.
5 is a diagram illustrating a waveform output by a partial discharge determination unit.
6 is a diagram illustrating an output of the generation position calculation unit.
7 is a flowchart illustrating a method for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0023] Reference is made to the accompanying drawings, which show by way of illustration specific embodiments in which the present invention may be practiced. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein with respect to one embodiment may be embodied in other embodiments without departing from the spirit and scope of the invention. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description set forth below is not intended to be taken in a limiting sense, and the scope of the invention, if properly described, is limited only by the appended claims, along with all scope equivalents to those claimed. Like reference numerals in the drawings refer to the same or similar functions throughout the various aspects.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily practice the present invention.

1 is a view showing an apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention.

Referring to FIG. 1 , the apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention includes a sensor unit 110 , a high-frequency switch unit 120 , a partial discharge determination unit 130 , and a generation location calculation unit 140 . ) may be included.

The sensor unit 110 may include a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear to detect electromagnetic waves. The band of the electromagnetic wave detected by the sensor unit 110 may be an Ultra High Frequency (UHF) band, and may have a detectable frequency range of 500 to 1500 MHz.

For example, the sensor unit 110 may have a shape similar to an antenna used for wireless communication to receive an electromagnetic wave, and is designed to respond to an electric or magnetic field to generate a current or voltage corresponding to the electric or magnetic field of the electromagnetic wave. You may.

_{Since the insulating gas such as sulfur hexafluoride (SF 6} ) may be included in the gas insulated switchgear, the sensor unit 110 may be implemented with a material having little chemical reaction to the insulating gas.

The high frequency switch unit 120 may control the movement path of the electromagnetic wave signal transmitted from the sensor unit 110 through a switching operation. The movement path may include a first movement path from the sensor unit 110 to the partial discharge determination unit 130 and a second movement path from the sensor unit 110 to the generation position calculation unit 140 . Accordingly, the high-frequency switch unit 120 may control whether the gas insulated switchgear partial discharge detection device performs partial discharge occurrence determination or partial discharge occurrence location estimation through a switching operation.

For example, the high-frequency switch unit 120 may perform a switching operation according to the input of the gas insulated switchgear manager, and may repeatedly perform the switching operation every predetermined period, and A switching operation may be performed according to the determination result. The gas insulated switchgear partial discharge detection apparatus can organically link the partial discharge occurrence determination and partial discharge occurrence location estimation in various principles according to the switching conditions of the high-frequency switch unit 120 .

The partial discharge determination unit 130 may be electrically connected to the high frequency switch unit 120 and may determine whether a partial discharge has occurred in the gas insulated switchgear by analyzing the pattern of the electromagnetic wave signal.

For example, the partial discharge determination unit 130 may store in advance a pattern common to the waveform of the electromagnetic wave signal when the partial discharge occurs in the gas insulated switchgear, and A waveform and a previously stored waveform may be compared with each other, and it may be determined whether the electromagnetic wave signal received from the sensor unit 110 is due to partial discharge according to the comparison result.

For example, the partial discharge determination unit 130 may determine that a partial discharge has occurred in the gas insulation switchgear when the peak value of the electromagnetic wave signal transmitted from the sensor unit 110 is greater than the reference value and continues for a reference time. have.

Depending on the design, the partial discharge determining unit 130 may transmit a switching signal to the high frequency switch unit 120 when it is determined that partial discharge has occurred in the gas insulated switchgear. The high-frequency switch unit 120 receiving the switching signal may transmit the electromagnetic wave signal to the generation position calculation unit 140 by performing a switching operation. Accordingly, the gas insulated switchgear partial discharge detection apparatus can perform the rapid integrated detection of the intermittent partial discharge.

According to the design, the partial discharge determination unit 130 is implemented as a human machine interface (HMI) to display a waveform of an electromagnetic wave signal, output an alarm when a partial discharge occurs in the gas insulated switchgear, and from the gas insulated switchgear manager It is also possible to perform integrated control by receiving a signal.

The generation position calculation unit 140 is electrically connected to the high frequency switch unit 120 and may calculate the generation position of the electromagnetic wave sensed by the sensor unit 110 using the electromagnetic wave detection times of the sensor unit 110 . A detailed calculation process will be described later with reference to FIG. 4 .

Depending on the design, the partial discharge determination unit 130 and the generation location calculation unit 140 may be implemented in one module, or may be implemented by being divided into a plurality of modules.

2 is a diagram specifically illustrating an apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention.

Referring to FIG. 2, the high-frequency switch unit is implemented as a transistor, and receives a control signal through one terminal, and passes or blocks electromagnetic wave signals through the other terminals. The first to eighth high-frequency switches 121, 122, 123, 124, 125, 126, 127, 128).

Referring to FIG. 2 , the gas insulated switchgear partial discharge detection apparatus according to an embodiment of the present invention includes a surge protection unit 150 , a low noise amplifier 160 , a filter unit 170 , and an analog-to-digital conversion unit 180 . ) may be further included.

The surge protection unit 150 is electrically connected to the first to fourth electromagnetic wave sensors 111 , 112 , 113 , and 114 , and surges flowing in from the first to fourth electromagnetic wave sensors 111 , 112 , 113 and 114 . ) can be removed. For example, the surge protection unit 150 may be implemented as a filter for filtering a signal of a surge frequency, and may be implemented as a circuit breaker or a fuse to protect a large surge from flowing into the low-noise amplifier 160 . .

The low noise amplifying unit 160 may be electrically connected to the surge protection unit 150 to amplify the electromagnetic wave signal. For example, the low noise amplification unit 160 may include a plurality of transistors configured as a common gate amplification stage or a common source amplification stage.

The filter unit 170 is electrically connected between the first to eighth high frequency switches 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 and the partial discharge determination unit 130 to filter the electromagnetic wave signal. action can be performed. For example, the filter unit 170 may be implemented as a band-pass filter having a wide bandwidth, and may be implemented as an active filter including an operational amplifier or a passive filter implemented as a passive element.

The analog-to-digital conversion unit 180 is electrically connected to the filter unit 170 and the first to eighth high-frequency switches 121, 122, 123, 124, 125, 126, 127, and 128 to convert an analog signal into a digital signal. can be converted For example, the analog-to-digital converter 180 may have a sampling frequency higher than a frequency in a detectable frequency range of the first to fourth electromagnetic wave sensors 111 , 112 , 113 , and 114 . Here, the sampling frequency may be 1 GS/s, but is not limited thereto. Also, the analog-to-digital converter 180 may have a feedback circuit for offset cancellation.

Referring to FIG. 2 , the partial discharge determination unit and the generation position calculation unit shown in FIG. 1 may be implemented with an FPGA 191 , a phase synchronizer 192 , an embedded board 193 , and a computer 194 . For example, the partial discharge determination unit and the generation position calculation unit may have an independent space in each of the FPGA 191 , the phase synchronizer 192 , the embedded board 193 , and the computer 194 . For example, the partial discharge determination unit may be implemented with the embedded board 193 and the computer 194 , and the generation position calculation unit may be implemented with the FPGA 191 and the phase synchronizer 192 .

The FPGA 191 may process digital signals at high speed. For example, the FPGA 191 may extract only partial discharge pulse data from the electromagnetic wave signal using a multi-trigger algorithm method.

The phase synchronizer 192 may synchronize the electromagnetic wave signals transmitted from the first to fourth electromagnetic wave sensors 111 , 112 , 113 , and 114 by using 16.66 ms as one cycle.

The embedded board 193 may process the extracted pulse data and transmit it to the computer 194 .

The computer 194 may perform an analysis operation and a storage operation on the received data.

3 is a view showing the arrangement of the electromagnetic wave sensor.

Referring to FIG. 3 , the gas insulated switchgear may include a first circuit breaker CB1 , a second circuit breaker CB2 , and a third circuit breaker CB3 that perform an opening and closing operation. Here, the first electromagnetic wave sensor 111 may be disposed on one side of the first circuit breaker CB1, and the second electromagnetic wave sensor 112 is disposed between the first circuit breaker CB1 and the second circuit breaker CB2. The third electromagnetic wave sensor 113 may be disposed between the second circuit breaker CB2 and the third circuit breaker CB3, and the fourth electromagnetic wave sensor 114 is the third circuit breaker CB3. may be disposed on one side of the

Accordingly, the apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention may determine which circuit breaker among the first to third circuit breakers CB1, CB2, and CB3 has caused the partial discharge.

4 is a view showing the position of the partial discharge detected by the electromagnetic wave sensor.

Referring to FIG. 4 , the separation distance between the first electromagnetic wave sensor Sensor1 and the second electromagnetic wave sensor Sensor2 is D1, the separation distance between the second electromagnetic wave sensor Sensor2 and the third electromagnetic wave sensor Sensor3 is D2, and the third The distance between the electromagnetic wave sensor Sensor3 and the fourth electromagnetic wave sensor Sensor4 is D3, and the distance between the partial discharge fault and the second electromagnetic wave sensor Sensor2 is d. Two of the first to fourth electromagnetic wave sensors may be bundled in a first to third combination.

The apparatus for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention may calculate a fault of a partial discharge by applying the attenuation coefficient α and the time difference value Δt to Equation 1 below. Here, C is the speed of light.

If the location (fault) of the partial discharge is between the second electromagnetic wave sensor (Sensor2) and the third electromagnetic wave sensor (Sensor3), the gas insulated switchgear partial discharge detection device applies D2 to D in Equation 1 and Δt An expression including d and α may be calculated by applying a difference value between the detection time of the second electromagnetic wave sensor Sensor2 and the detection time of the third electromagnetic wave sensor Sensor3 .

In addition, the gas insulated switchgear partial discharge detection apparatus may calculate a1 by dividing C from D1 and dividing the difference value between the detection time of the first electromagnetic wave sensor Sensor1 and the detection time of the second electromagnetic wave sensor Sensor2 .

In addition, the gas insulated switchgear partial discharge detection apparatus may calculate α2 by dividing C from D3 and dividing the difference value between the detection time of the third electromagnetic wave sensor Sensor3 and the detection time of the fourth electromagnetic wave sensor Sensor4.

Thereafter, the gas insulated switchgear partial discharge detection device may calculate d by applying a value belonging to the range of α1 to α2 to α of Equation 1.

Accordingly, the gas insulated switchgear partial discharge detection apparatus can accurately estimate the partial discharge occurrence position by reflecting the attenuation of electromagnetic waves generated according to the partial discharge.

5 is a diagram illustrating a waveform output by a partial discharge determination unit.

5, a waveform (Ch1) transmitted from the first electromagnetic wave sensor, a waveform (Ch2) transmitted from the second electromagnetic wave sensor, a waveform (Ch3) transmitted from the third electromagnetic wave sensor, and a waveform transmitted from the fourth electromagnetic wave sensor (Ch4) may be respectively output on one screen. That is, the partial discharge determination unit can use the multi-trigger function.

If a pattern according to the partial discharge appears in one of the Ch1 to Ch4 waveforms, the partial discharge determination unit may extract and store the pulse by selecting only the pulse data of the corresponding area of the box among all the data, and may delete the remaining data. The partial discharge determination unit may store waveforms and perform pattern analysis in depth using the extracted pulses.

6 is a diagram illustrating an output of the generation position calculation unit.

Referring to FIG. 6 , the generation position calculator includes a first map reflecting the positions of the first and second electromagnetic wave sensors S1 and S2, and a second map reflecting the positions of the second and third electromagnetic wave sensors S2 and S3. And, a third map in which the positions of the third and fourth electromagnetic wave sensors S3 and S4 are reflected may be displayed.

Here, each location of the first map may correspond to the location of section A in the gas insulation switchgear, and each location of the second map may correspond to the location of section B in the gas insulation switchgear, and the third map Each position of may correspond to the position of section C in the gas insulated switchgear.

In addition, when the electromagnetic wave sensor that first sensed the electromagnetic wave and the electromagnetic wave sensor that sensed the second electromagnetic wave are one of the first and second electromagnetic wave sensors S1 and S2, the generation position calculation unit shows the d in the first map Display values of a position corresponding to , a second predetermined position on the second map, and a fourth predetermined position on the third map may be changed. For example, the second predetermined location may be adjacent to the left edge of the second map, and the fourth predetermined location may be adjacent to the left edge of the third map.

In addition, when the electromagnetic wave sensor that first sensed the electromagnetic wave and the electromagnetic wave sensor that sensed the second electromagnetic wave are one of the second and third electromagnetic wave sensors S2 and S3, respectively, the first The display value of the predetermined position, the position corresponding to d in the second map, and the fourth predetermined position in the third map may be changed. For example, the first predetermined location may be adjacent to a right edge of the first map.

In addition, when the electromagnetic wave sensor that first senses the electromagnetic wave and the electromagnetic wave sensor that detects the second electromagnetic wave are one of the third and fourth electromagnetic wave sensors S3 and S4, the generation position calculation unit shows the first in the first map Display values of a predetermined location and a third predetermined location on the second map and a location corresponding to d on the third map may be changed. For example, the third predetermined location may be adjacent to a right edge of the second map.

The generation location calculation unit may display the first to third maps by utilizing the first to third maps, so that the gas insulated switchgear manager can intuitively grasp the occurrence location of the partial discharge.

7 is a flowchart illustrating a method for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention.

Referring to FIG. 7 , in the method for detecting partial discharge of a gas insulated switchgear according to an embodiment of the present invention, the step of setting the operation mode to one of a first mode and a second mode (S10), and different positions of the gas insulated switchgear Step (S20) of receiving an electromagnetic wave signal from a plurality of electromagnetic wave sensors disposed in the Step (S30) and when the set operation mode is the second mode, calculating the position where the electromagnetic wave is generated in the gas insulated switchgear using the electromagnetic wave signal detection times of the plurality of electromagnetic wave sensors (S40). have.

Here, the gas insulated switchgear partial discharge detection device may generate a switching signal when it is determined that a partial discharge has occurred in the gas insulated switchgear in the determining step (S30), and when the switching signal is generated, the setting In step S10, the operation mode may be changed.

In the above, the present invention has been described as an embodiment, but the present invention is not limited to the above embodiment, and without departing from the gist of the present invention as claimed in the claims, those of ordinary skill in the art to which the invention pertains Anyone can make various modifications.

110: sensor unit
111-114: electromagnetic wave sensor
120: high frequency switch unit
121-128: high frequency switch
130: partial discharge determination unit
140: occurrence location calculation unit
150: surge protection unit
160: low noise amplification unit
170: filter unit
180: analog-digital conversion unit
191: FPGA
192: phase synchronizer
193: Embedded Board
194: computer
CB1-CB3: Breaker

Claims (2)

a sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear to detect electromagnetic waves;
a high-frequency switch unit for controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation;
a partial discharge determination unit receiving the electromagnetic wave signal from the high frequency switch unit and analyzing a pattern of the electromagnetic wave signal to determine whether a partial discharge has occurred in the gas insulated switchgear; and
a generation position calculation unit receiving the electromagnetic wave signal from the high-frequency switch unit and calculating the generation position of the electromagnetic wave sensed by the sensor unit using the electromagnetic wave detection times of the sensor unit;
The number of the plurality of electromagnetic wave sensors is at least three,
The occurrence position calculation unit is represented by the following formula:

Calculate the location of the electromagnetic wave detected by the sensor unit by applying the attenuation coefficient α and the time difference value Δ to
Calculating the attenuation coefficient α using the detection time difference value of the electromagnetic wave sensors included in the first combination of the plurality of electromagnetic wave sensors and the detection time difference value of the electromagnetic wave sensors included in the second combination,
Applying the detection time difference value of the electromagnetic wave sensors included in the third combination to the △,
where d is the distance between one of the plurality of electromagnetic wave sensors and the location of the electromagnetic wave, D is the distance between one of the plurality of electromagnetic wave sensors and the other, C is the speed of light,
The high frequency switch unit performs a switching operation to change the movement path when the partial discharge determination unit determines that a partial discharge has occurred in the gas insulated switchgear.
setting the operation mode to one of a first mode and a second mode;
Receiving electromagnetic wave signals from a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switchgear;
analyzing the pattern of the electromagnetic wave signal when the set operation mode is the first mode to determine whether partial discharge of the gas insulated switchgear occurs; and
When the set operation mode is the second mode, using the electromagnetic wave signal detection time points of the plurality of electromagnetic wave sensors, calculating the position where the electromagnetic wave is generated in the gas insulated switchgear;
The number of the plurality of electromagnetic wave sensors is at least three,
The step of calculating the position where the electromagnetic wave is generated,
Equation:

By applying the attenuation coefficient α and the time difference value △ to calculate the location of the electromagnetic wave detected by the plurality of electromagnetic wave sensors,
Calculating the attenuation coefficient α using the detection time difference value of the electromagnetic wave sensors included in the first combination of the plurality of electromagnetic wave sensors and the detection time difference value of the electromagnetic wave sensors included in the second combination,
Applying the detection time difference value of the electromagnetic wave sensors included in the third combination to the △,
where d is the distance between one of the plurality of electromagnetic wave sensors and the location of the electromagnetic wave, D is the distance between one of the plurality of electromagnetic wave sensors and the other, C is the speed of light,
The determining step generates a switching signal when it is determined that a partial discharge has occurred in the gas insulated switchgear,
The setting step is a gas insulated switchgear partial discharge detection method, characterized in that changing the operation mode when the switching signal is generated.

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