KR102553450B1 - Apparatus and method for detecting partial discharge in gas insulated switchgear - Google Patents

Abstract

A gas insulated switch partial discharge detection device 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 switch and detecting electromagnetic waves, and an electromagnetic wave signal transmitted from the sensor unit. A high-frequency switch unit that controls the moving path through a switching operation, a partial discharge determination unit that receives an electromagnetic wave signal from the high-frequency switch unit and analyzes the pattern of the electromagnetic wave signal to determine whether a partial discharge has occurred in the gas insulated switchgear, and a high-frequency switch unit It may include a generation position calculation unit that receives an electromagnetic wave signal from the sensor 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.

Description

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

The present invention relates to a gas insulated switch partial discharge detection device and method.

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

Publication No. 10-2016-0046014

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

A gas insulated switch partial discharge detection device 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 switch to detect electromagnetic waves; a high-frequency switch unit controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determining unit receiving an 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 switch; and a generation position calculation unit receiving an electromagnetic wave signal from the high frequency switch unit and calculating 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 generating position calculation unit has the following equation:

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

A gas insulated switch partial discharge detection device 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 switch to detect electromagnetic waves; a high-frequency switch unit controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determining unit receiving an 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 switch; and a generation position calculation unit receiving an electromagnetic wave signal from the high frequency switch unit and calculating 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 switch 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 the first circuit breaker and the second circuit breaker. a second electromagnetic wave sensor, 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.In addition, the occurrence position calculation unit has the following equation:

The electromagnetic wave sensor that first detects the electromagnetic wave among the first, second, third, and fourth electromagnetic wave sensors calculates the generation position of the electromagnetic wave sensed by the sensor unit by applying the attenuation coefficient α and the time difference value △ to The attenuation coefficient α is calculated by applying a detection point difference between E and an adjacent electromagnetic wave sensor to the △, and calculating the attenuation coefficient α using the sensing time difference values of each of the electromagnetic wave sensors not involved in the △ and the electromagnetic wave sensor involved in the △, 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 another one, and C is the speed of light.

A gas insulated switch partial discharge detection method according to an embodiment of the present invention includes 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 switch; determining whether a partial discharge has occurred in the gas insulated switch by analyzing a pattern of the electromagnetic wave signal when the set operation mode is the first mode; and calculating a position where an electromagnetic wave is generated in the gas insulated switchgear using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors when the set operation mode is the second mode.

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 location where the electromagnetic wave is generated is performed by the following equation:

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

A gas insulated switch partial discharge detection method according to another embodiment of the present invention includes 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 switch; determining whether a partial discharge has occurred in the gas insulated switch by analyzing a pattern of the electromagnetic wave signal when the set operation mode is the first mode; and calculating a position where an electromagnetic wave is generated in the gas insulated switchgear using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors when the set operation mode is the second mode.

The gas insulated switch includes first, second, and third circuit breakers, and the plurality of electromagnetic wave sensors include a first electromagnetic wave sensor disposed on one side of the first circuit breaker, and a circuit breaker of the first circuit breaker and the second circuit breaker. A second electromagnetic wave sensor disposed between, a third electromagnetic wave sensor disposed between the second circuit breaker and a 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 location where the electromagnetic wave is generated is the following equation:

An attenuation coefficient α and a time difference value △ are applied to calculate the generation position of the electromagnetic wave detected by the plurality of electromagnetic wave sensors, and the electromagnetic wave is detected first among the first, second, third, and fourth electromagnetic wave sensors. Calculate the attenuation coefficient α by applying a detection point difference between an electromagnetic wave sensor and an adjacent electromagnetic wave sensor to the △, and using detection time difference values between 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 another one, and C is the speed of light.

The gas insulated switch 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 intermittently occurring partial discharge. can

In addition, the gas insulated switch partial discharge detection apparatus and method according to an embodiment of the present invention can organically link partial discharge occurrence determination and partial discharge occurrence location estimation to each other, and can simplify and implement the integrated detection function for partial discharge. It can provide convenience in the management of gas insulated switchgear managers.

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

In addition, the gas insulated switch partial discharge detection apparatus and method according to an embodiment of the present invention can allow a gas insulated switch manager to intuitively grasp the location of partial discharge.

1 is a diagram showing a gas insulated switch partial discharge detection device according to an embodiment of the present invention.
2 is a diagram specifically illustrating a gas insulated switch partial discharge detection device according to an embodiment of the present invention.
3 is a diagram showing the arrangement of electromagnetic wave sensors.
4 is a diagram showing the position of a partial discharge detected by an electromagnetic wave sensor.
5 is a diagram illustrating a waveform output by a partial discharge determining unit.
6 is a diagram illustrating an output of the occurrence position calculation unit.
7 is a flowchart illustrating a method for detecting partial discharge in a gas insulated switch according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The detailed description of the present invention which follows refers to the accompanying drawings which illustrate, 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 from each other but are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in one embodiment in another embodiment without departing from the spirit and scope of the invention. Additionally, 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 invention. Accordingly, the detailed description set forth below is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all equivalents as claimed by those claims. Like reference numbers in the drawings indicate the same or similar function throughout the various aspects.

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

1 is a diagram showing a gas insulated switch partial discharge detection device according to an embodiment of the present invention.

Referring to FIG. 1 , an apparatus for detecting partial discharge in a gas insulated switch 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 an occurrence position calculation unit 140. ) may be included.

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

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

Since an insulating gas such as sulfur hexafluoride (SF ₆ ) may be included in the gas insulated switch, the sensor unit 110 may be made of a material having little chemical reaction to the insulating gas.

The high frequency switch unit 120 may control a 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 . Therefore, the high-frequency switch unit 120 can control whether the gas insulated switch 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 an input of a gas insulated switch manager, and may repeatedly perform a switching operation at predetermined intervals, and the partial discharge determination unit 130 may perform a switching operation. A switching operation may be performed according to the determination result. The gas insulated switch partial discharge detection device can organically link partial discharge occurrence determination and partial discharge occurrence location estimation according to various principles according to the switching conditions of the high frequency switch unit 120 .

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

For example, the partial discharge determining unit 130 may store in advance a pattern that the waveform of an electromagnetic wave signal has in common when a partial discharge occurs in a gas insulated switchgear, and the electromagnetic wave signal received from the sensor unit 110 The waveform and the previously stored waveform may be compared with each other, and based on the comparison result, it may be determined whether the electromagnetic wave signal received from the sensor unit 110 is caused by partial discharge.

For example, the partial discharge determination unit 130 may determine that partial discharge has occurred in the gas insulated switch when the peak value of the electromagnetic wave signal received from the sensor unit 110 is greater than the reference value and continues for the reference time. there is.

Depending on the design, the partial discharge determination 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 switch. Upon receiving the switching signal, the high frequency switch unit 120 may perform a switching operation and transmit the electromagnetic wave signal to the generation location calculation unit 140 . Accordingly, the gas insulated switch partial discharge detection device can perform rapid integrated detection of intermittently generated partial discharges.

Depending on the design, the partial discharge determining unit 130 is implemented as a human machine interface (HMI) to display the waveform of an electromagnetic wave signal, output an alarm when a partial discharge occurs in a gas insulated switch, and receive information from a gas insulated switch manager. Integrated control may be performed by receiving a signal.

The generation position calculation unit 140 is electrically connected to the high frequency switch unit 120 and can calculate the generation position of the electromagnetic wave sensed by the sensor unit 110 using the electromagnetic wave detection points 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 occurrence location calculation unit 140 may be implemented in one module or may be implemented in a plurality of modules.

2 is a diagram specifically illustrating a gas insulated switch partial discharge detection device according to an embodiment of the present invention.

Referring to FIG. 2, the high frequency switch unit is implemented as a transistor, and each of the first to eighth high frequency switches (121, 122, 123, 124, 124, 125, 126, 127, 128).

2, a gas insulated switch partial discharge detection device according to an embodiment of the present invention includes a surge protection unit 150, a low noise amplification unit 160, a filter unit 170, and an analog-to-digital conversion unit 180. ) may further include.

The surge protection unit 150 is electrically connected to the first to fourth electromagnetic wave sensors 111, 112, 113, and 114 so as to receive surges flowing 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, or may be implemented as a circuit breaker or fuse to protect a large surge from flowing into the low noise amplification unit 160. .

The low noise amplification unit 160 may be electrically connected to the surge protection unit 150 to amplify an 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, and 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 with passive elements.

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 analog signals into digital signals. can be converted For example, the analog-to-digital converter 180 may have a sampling frequency higher than a frequency within 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 offset.

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

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

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

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

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

3 is a diagram showing the arrangement of electromagnetic wave sensors.

Referring to FIG. 3 , the gas insulated switch 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. A 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 may be disposed between the third circuit breaker CB3 It can be placed on one side of.

Accordingly, the gas insulated switch partial discharge detection device according to an embodiment of the present invention can determine which circuit breaker among the first to third circuit breakers CB1, CB2, and CB3 has generated partial discharge.

4 is a diagram showing the position of a partial discharge detected by an 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 electromagnetic wave sensor Sensor2 is D2. The separation distance between the electromagnetic wave sensor Sensor3 and the fourth electromagnetic wave sensor Sensor4 is D3, and the distance between the location of partial discharge (fault) and the second electromagnetic wave sensor Sensor2 is d. Two of the first to fourth electromagnetic wave sensors may be combined in first to third combinations.

The gas insulated switch partial discharge detection device according to an embodiment of the present invention may calculate the location (fault) of the 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 switch partial discharge detection device applies D2 to D in Equation 1 and △t An equation including d and α may be calculated by applying a difference between the detection time of the second electromagnetic wave sensor Sensor2 and the detection time of the third electromagnetic wave sensor Sensor3 to .

In addition, the gas insulated switch partial discharge detection device divides C from D1 and divides the difference between the detection time of the first electromagnetic wave sensor (Sensor1) and the detection time of the second electromagnetic wave sensor (Sensor2) to calculate a1.

In addition, the gas insulated switch partial discharge detection device divides C from D3 and divides the difference between the detection time of the third electromagnetic wave sensor (Sensor3) and the detection time of the fourth electromagnetic wave sensor (Sensor4) to calculate α2.

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

Accordingly, the gas insulated switch partial discharge detection device can accurately estimate the location of the partial discharge by reflecting the attenuation of the electromagnetic wave generated according to the partial discharge.

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

Referring to FIG. 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) can be output on one screen. That is, the partial discharge determination unit may use multiple trigger functions.

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

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

Referring to FIG. 6 , the generation location 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 reflecting the locations of the third and fourth electromagnetic wave sensors S3 and S4 may be displayed.

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

In addition, the occurrence position calculation unit detects the electromagnetic wave in the first map when the electromagnetic wave sensor that detects the electromagnetic wave first and the electromagnetic wave sensor that detects the electromagnetic wave second is one of the first and second electromagnetic wave sensors S1 and S2, respectively. It is possible to change the display value of the position corresponding to , the second predetermined position on the second map, and the fourth predetermined position on the third map. 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 detects the electromagnetic wave first and the electromagnetic wave sensor that detects the electromagnetic wave secondly is one of the second and third electromagnetic wave sensors S2 and S3, the generation position calculation unit detects the first electromagnetic wave in the first map. A display value of a predetermined position, a 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 the right edge of the first map.

In addition, the generation position calculation unit detects electromagnetic waves firstly and when an electromagnetic wave sensor that detects electromagnetic waves secondly is one of the third and fourth electromagnetic wave sensors S3 and S4, the first map in the first map. A display value of a predetermined position, a third predetermined position on the second map, and a position corresponding to d on the third map may be changed. For example, the third predetermined location may be adjacent to the right edge of the second map.

The occurrence location calculation unit displays the first to third maps using the first to third maps, so that a manager of the gas insulated switch can intuitively grasp the occurrence location of the partial discharge.

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

Referring to FIG. 7, a gas insulated switch partial discharge detection method according to an embodiment of the present invention includes setting an operation mode to one of a first mode and a second mode (S10), and different positions of the gas insulated switch. Receiving electromagnetic wave signals from a plurality of electromagnetic wave sensors disposed on (S20), and 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 switch has occurred It may include step (S30) and step (S40) of calculating a location where electromagnetic waves are generated in the gas insulated switch using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors when the set operation mode is the second mode. there is.

Here, the gas insulated switch partial discharge detection device may generate a switching signal when it is determined that partial discharge has occurred in the gas insulated switch in the determining step (S30), and when the switching signal is generated, the set 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-described embodiments, and those skilled in the art in the field to which the invention pertains without departing from the gist of the present invention claimed in the claims Anyone can make various variations.

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 position calculation unit
150: surge protector
160: low noise amplification unit
170: filter unit
180: analog-digital conversion unit
191: FPGA
192: phase synchronization unit
193: embedded board
194: computer
CB1-CB3: Breakers

Claims (2)

A sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switch to detect electromagnetic waves;
a high-frequency switch unit controlling a movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation;
a partial discharge determining unit receiving an 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 switch; and
A generation position calculation unit receiving an electromagnetic wave signal from the high frequency switch unit and calculating a generation position of the electromagnetic wave sensed by the sensor unit using the electromagnetic wave detection time points of the sensor unit;
The gas insulated switch includes first, second and third circuit breakers,
The sensor unit includes a first electromagnetic wave sensor disposed on one side of the first circuit breaker, a second electromagnetic wave sensor disposed between the first circuit breaker and the second circuit breaker, and disposed between the second circuit breaker and the third circuit breaker. A third electromagnetic wave sensor and a fourth electromagnetic wave sensor disposed on one side of the third circuit breaker,
The occurrence position calculation unit has the following equation:

Calculate the generation position of the electromagnetic wave sensed by the sensor unit by applying an attenuation coefficient α and a viewpoint difference value Δ to
A detection time difference between an electromagnetic wave sensor first detecting an electromagnetic wave and an adjacent electromagnetic wave sensor among the first, second, third, and fourth electromagnetic wave sensors is applied to Δ, and each electromagnetic wave sensor not involved in Δ and the electromagnetic wave sensor Calculate the attenuation coefficient α using difference values of the detection time of the electromagnetic wave sensor involved in Δ;
Here, 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 another one, C is the speed of light,
The high-frequency switch unit performs a switching operation when the partial discharge determination unit determines that a partial discharge has occurred in the gas insulated switch to change the moving path.
setting an operating 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 switch;
determining whether a partial discharge has occurred in the gas insulated switch by analyzing a pattern of the electromagnetic wave signal when the set operation mode is the first mode; and
When the set operation mode is the second mode, calculating a position where an electromagnetic wave is generated in the gas insulated switch using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors; includes,
The gas insulated switch includes first, second and third circuit breakers,
The plurality of electromagnetic wave sensors include a first electromagnetic wave sensor disposed on one side of the first circuit breaker, a second electromagnetic wave sensor disposed between the first circuit breaker and the second circuit breaker, and between the second circuit breaker and the third circuit breaker. a third electromagnetic wave sensor disposed on a side of the third circuit breaker, and a fourth electromagnetic wave sensor disposed on one side of the third circuit breaker;
In the step of calculating the location where the electromagnetic wave is generated,
Equation below:

Calculate the generation position of electromagnetic waves sensed by the plurality of electromagnetic wave sensors by applying an attenuation coefficient α and a viewpoint difference value Δ to
A detection time difference between an electromagnetic wave sensor first detecting an electromagnetic wave and an adjacent electromagnetic wave sensor among the first, second, third, and fourth electromagnetic wave sensors is applied to Δ, and each electromagnetic wave sensor not involved in Δ and the electromagnetic wave sensor Calculate the attenuation coefficient α using difference values of the detection time of the electromagnetic wave sensor involved in Δ;
Here, 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 another one, C is the speed of light,
The determining step generates a switching signal when it is determined that partial discharge has occurred in the gas insulated switchgear,
The setting step is a gas insulated switch partial discharge detection method of changing the operation mode when the switching signal is generated.

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