KR102604605B1 - Apparatus 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 movement path through a switching operation, a partial discharge determination unit that receives electromagnetic wave signals from the high-frequency switch unit and analyzes the pattern of the electromagnetic wave signal to determine whether partial discharge occurs in the gas insulated switch, and a high-frequency switch unit. It may include a generation location calculation unit that receives an electromagnetic wave signal from the sensor unit and calculates the generation location of the electromagnetic wave detected by the sensor unit using the electromagnetic wave detection points of the sensor unit.

Description

Gas insulated switch partial discharge detection device {Apparatus for detecting partial discharge in gas insulated switchgear}

The present invention relates to a partial discharge detection device for gas insulated switchgear.

Gas insulated switchgear (GIS) is installed in power plants or substations and can perform opening and closing operations while flowing a large current of high voltage. Partial discharge (PD) may occur in these gas-insulated switches as a precursor to failure due to internal abnormalities. Partial discharge can cause insulation breakdown in gas insulated switchgear and cause significant disruption in power supply to power plants or substations. Therefore, it is important to prevent accidents such as insulation breakdown by detecting partial discharge occurring in gas insulated switchgear.

Public Patent Publication No. 10-2016-0046014

One embodiment of the present invention provides a gas insulated switch partial discharge detection device that can both determine the occurrence of a partial discharge and estimate the location of the occurrence of the 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 and detecting electromagnetic waves; a high-frequency switch unit that controls the movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determination unit that receives an electromagnetic wave signal from the high-frequency switch unit and analyzes a pattern of the electromagnetic wave signal to determine whether a partial discharge occurs in the gas insulated switch; and a location calculation unit that receives the electromagnetic wave signal from the high-frequency switch unit and calculates the location of the electromagnetic wave detected by the sensor unit using the electromagnetic wave detection points of the sensor unit.

Here, the number of the plurality of electromagnetic wave sensors is at least three, and the occurrence position calculation unit uses the following equation: The attenuation coefficient α and the viewpoint difference value △ are applied to calculate the generation location of the electromagnetic wave detected by the sensor unit, the detection viewpoint 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 point difference value of the electromagnetic wave sensors included in the combination, and the detection point difference value of the electromagnetic wave sensors included in the third combination is applied to △, where d is the plurality of electromagnetic waves D 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, 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 and detecting electromagnetic waves; a high-frequency switch unit that controls the movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation; a partial discharge determination unit that receives an electromagnetic wave signal from the high-frequency switch unit and analyzes a pattern of the electromagnetic wave signal to determine whether a partial discharge occurs in the gas insulated switch; and a location calculation unit that receives the electromagnetic wave signal from the high-frequency switch unit and calculates the location of the electromagnetic wave detected by the sensor unit using the electromagnetic wave detection points of the sensor unit.

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

And, the occurrence position calculation unit uses the following equation: The attenuation coefficient α and the viewpoint difference value △ are applied to calculate the location of occurrence of the electromagnetic wave detected by the sensor unit, and the electromagnetic wave sensor that detects the electromagnetic wave first among the first, second, third and fourth electromagnetic wave sensors Apply the detection point difference between and the adjacent electromagnetic wave sensor to △, and calculate the attenuation coefficient α using the detection point difference values of each electromagnetic wave sensor not involved in △ and the electromagnetic wave sensor involved in △, where , d is the distance between one of the first to fourth electromagnetic wave sensors and the location of generation of the electromagnetic wave, D is the distance between one of the first to fourth electromagnetic wave sensors and the other, and C is the speed of light.

A method for detecting partial discharge in a gas insulated switch 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; When the set operation mode is the first mode, analyzing the pattern of the electromagnetic wave signal to determine whether partial discharge occurs in the gas insulated switch; And when the set operation mode is the second mode, calculating the location where the electromagnetic wave is generated in the gas insulated switch using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors.

Here, the number of the plurality of electromagnetic wave sensors is at least 3, and the step of calculating the location where the electromagnetic wave occurs is calculated by the following equation: Calculate the generation position of the electromagnetic wave detected by the plurality of electromagnetic wave sensors by applying the attenuation coefficient α and the viewpoint difference value △, and the detection viewpoint 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 point difference value of the electromagnetic wave sensors included in the second combination, and the detection point difference value of the electromagnetic wave sensors included in the third combination is applied to △, where d is the plurality of is the distance between one of the electromagnetic wave 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, and C is the speed of light.

A method for detecting partial discharge in a gas insulated switch 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; When the set operation mode is the first mode, analyzing the pattern of the electromagnetic wave signal to determine whether partial discharge occurs in the gas insulated switch; And when the set operation mode is the second mode, calculating the location where the electromagnetic wave is generated in the gas insulated switch using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors.

In addition, the gas insulated switch 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 a connection between the first circuit breaker and the second circuit breaker. It includes a second electromagnetic wave sensor disposed between, a third electromagnetic wave sensor disposed between the second and third circuit breakers, and a fourth electromagnetic wave sensor disposed on one side of the third circuit breaker.

Here, the step of calculating the location where the electromagnetic wave occurs is the following equation: The attenuation coefficient α and the viewpoint difference value △ are applied to calculate the generation location of the electromagnetic wave detected by the plurality of electromagnetic wave sensors, and the first to detect the electromagnetic wave among the first, second, third and fourth electromagnetic wave sensors Applying the detection point difference between the electromagnetic wave sensor and the adjacent electromagnetic wave sensor to △, calculating the attenuation coefficient α using the detection point difference values of each electromagnetic wave sensor not involved in △ and the electromagnetic wave sensor involved in △, , where d is the distance between one of the first to fourth electromagnetic wave sensors and a location of generation of the electromagnetic wave, D is the distance between one of the first to fourth electromagnetic wave sensors and the other, and C is the speed of light.

The gas insulated switch partial discharge detection device according to an embodiment of the present invention can both determine the occurrence of a partial discharge and estimate the location of the partial discharge, and can perform rapid integrated detection of partial discharges that occur intermittently. .

In addition, the gas insulated switch partial discharge detection device according to an embodiment of the present invention can organically link partial discharge occurrence determination and partial discharge occurrence location estimation, and can implement a simplified integrated detection function for partial discharge. , It can provide convenience for the management of gas insulated switch managers.

In addition, the gas insulated switch partial discharge detection device according to an embodiment of the present invention can accurately estimate the location of partial discharge occurrence by reflecting the attenuation of electromagnetic waves generated due to partial discharge.

In addition, the gas insulated switch partial discharge detection device according to an embodiment of the present invention can enable the gas insulated switch manager to intuitively identify the location of the partial discharge.

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

The detailed description of the present invention described below refers to the accompanying drawings, which show by way of example specific embodiments in which the present invention may be practiced. It should be understood that the various embodiments of the invention are different from one another but are not necessarily mutually exclusive. For example, specific shapes, structures and characteristics described herein with respect to one embodiment may be implemented in other embodiments 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 that follows is not intended to be taken in a limiting sense, and the scope of the invention is limited only by the appended claims, together with all equivalents to what those claims assert, if properly described. Similar reference numbers in the drawings refer to identical or similar functions across various aspects.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings in order to enable those skilled in the art to easily practice the present invention.

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

Referring to Figure 1, the gas insulated switch partial discharge detection device 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 location calculation unit 140. ) may include.

The sensor unit 110 may include a plurality of electromagnetic wave sensors that are disposed at different positions of the gas insulated switch and detect electromagnetic waves. The band of electromagnetic waves detected 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 and can receive electromagnetic waves, and is designed to respond to electric or magnetic fields to generate a current or voltage corresponding to the electric or magnetic field of the electromagnetic wave. You may.

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

The high-frequency switch unit 120 can 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 occurrence location 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 can perform a switching operation according to the input of the gas insulated switch manager, and can repeatedly perform the switching operation at predetermined periods, and the partial discharge determination unit 130 A switching operation can be performed according to the judgment result. The gas insulated switch partial discharge detection device can organically link partial discharge occurrence determination and partial discharge occurrence location estimation using 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 partial discharge has occurred in the gas insulated switch 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 a partial discharge occurs in the gas insulated switch, and may store in advance the pattern of the electromagnetic wave signal received from the sensor unit 110. The waveform and the previously stored waveform can be compared, and based on the comparison result, it can 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 a 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 a partial discharge has occurred in the gas insulated switch. The high-frequency switch unit 120 that receives the switching signal may perform a switching operation and transmit the electromagnetic wave signal to the occurrence location calculation unit 140. Accordingly, the gas insulated switch partial discharge detection device can perform rapid integrated detection of intermittently occurring partial discharges.

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

The generation location calculation unit 140 is electrically connected to the high frequency switch unit 120 and can calculate the generation location of the electromagnetic wave detected by the sensor unit 110 using the electromagnetic wave detection points of the sensor unit 110. The specific 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 within one module, or may be implemented separately as a plurality of modules.

Figure 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 units are each implemented with a transistor and include first to eighth high-frequency switches 121, 122, 123, 124, which receive a control signal through one terminal and pass or block the electromagnetic wave signal through other terminals. 125, 126, 127, 128).

Referring to FIG. 2, the gas insulated switch partial discharge detection device 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 further be included.

The surge protection unit 150 is electrically connected to the first to fourth electromagnetic wave sensors 111, 112, 113, and 114 to protect against 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 that filters signals of surge frequency, and may also be implemented as a breaker or fuse to protect large surges from flowing into the low-noise amplifier 160. .

The low-noise amplifier 160 may be electrically connected to the surge protection unit 150 to amplify the electromagnetic wave signal. For example, the low-noise amplifier 160 may include a plurality of transistors configured as a common gate amplifier stage or a common source amplifier 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 electromagnetic wave signals. The action can be performed. For example, the filter unit 170 may be implemented as a band-pass filter with a wide bandwidth, an active filter including an operational amplifier, or a passive filter implemented as a passive element.

The analog-to-digital converter 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. It can be converted. For example, the analog-to-digital converter 180 may have a sampling frequency higher than the detectable frequency range of the first to fourth electromagnetic wave sensors 111, 112, 113, and 114. Here, the sampling frequency may be 1GS/s, but is not limited thereto. Additionally, the analog-to-digital converter 180 may have a feedback circuit for offset cancellation.

Referring to FIG. 2, the partial discharge determination unit and occurrence location calculation unit shown in FIG. 1 may be implemented with 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, phase synchronization unit 192, embedded board 193, and computer 194. For example, the partial discharge determination unit may be implemented with an embedded board 193 and a computer 194, and the occurrence location 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 can extract only partial discharge pulse data from electromagnetic wave signals using a multi-trigger algorithm.

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

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

The computer 194 can perform analysis and storage operations on the received data.

Figure 3 is a diagram showing the arrangement of an electromagnetic wave sensor.

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 opening and closing operations. Here, the first electromagnetic wave sensor 111 may be placed on one side of the first circuit breaker (CB1), and the second electromagnetic wave sensor 112 may be placed between the first circuit breaker (CB1) and the second circuit breaker (CB2). It can be arranged, the third electromagnetic wave sensor 113 can be arranged between the second circuit breaker (CB2) and the third circuit breaker (CB3), and the fourth electromagnetic wave sensor 114 is 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 of the first to third circuit breakers (CB1, CB2, CB3) the partial discharge occurred.

Figure 4 is a diagram showing the location of 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 separation distance between the second electromagnetic wave sensor (Sensor2) and the third electromagnetic wave sensor (Sensor3) is D1. The separation distance between the electromagnetic wave sensor (Sensor3) and the fourth electromagnetic wave sensor (Sensor4) is D3, and the distance between the location (fault) of partial discharge and the second electromagnetic wave sensor (Sensor2) is d. Two of the first to fourth electromagnetic wave sensors may be grouped into a first to third combination.

The gas insulated switch partial discharge detection device according to an embodiment of the present invention can calculate the location (fault) of partial discharge by applying the attenuation coefficient α and the point difference value Δt to Equation 1 below. Here, C is the speed of light.

If the location (fault) of partial discharge occurs 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 can be calculated by applying the difference 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 switch partial discharge detection device can calculate a1 by dividing C in D1 and dividing the difference 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 switch partial discharge detection device can calculate α2 by dividing C in D3 and dividing the difference 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 switch partial discharge detection device can 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 electromagnetic waves generated due to the partial discharge.

Figure 5 is a diagram showing the waveform output by the partial discharge determination 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 each be displayed on one screen. In other words, the partial discharge determination unit can use multiple trigger functions.

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

Figure 6 is a diagram illustrating the output of the occurrence location calculation unit.

Referring to FIG. 6, the occurrence location calculation unit creates a first map reflecting the positions of the first and second electromagnetic wave sensors (S1, S2), and a second map reflecting the positions of the second and third electromagnetic wave sensors (S2, S3). And, a third map reflecting the positions of the third and fourth electromagnetic wave sensors S3 and S4 may be displayed.

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

In addition, the occurrence location calculation unit determines that the d The display value of the location corresponding to the second predetermined location in the second map and the fourth predetermined location in the third map can be changed. For example, a second predetermined location may be adjacent to the left edge of the second map, and a fourth predetermined location may be adjacent to the left edge of the third map.

In addition, the occurrence location calculation unit determines the first electromagnetic wave sensor in the first map when the electromagnetic wave sensor that first detects the electromagnetic wave and the electromagnetic wave sensor that detects the electromagnetic wave second are one of the second and third electromagnetic wave sensors (S2 and S3), respectively. The display values of the predetermined location, the location corresponding to d in the second map, and the fourth predetermined location in the third map can be changed. For example, the first predetermined location may be adjacent to the right edge of the first map.

In addition, the occurrence location calculation unit determines the first electromagnetic wave sensor in the first map when the electromagnetic wave sensor that first detects the electromagnetic wave and the electromagnetic wave sensor that detects the electromagnetic wave second is one of the third and fourth electromagnetic wave sensors (S3 and S4). The display value of the predetermined location, the third predetermined location in the second map, and the location corresponding to d in the third map can 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, allowing the gas insulated switch manager to intuitively determine the location of the partial discharge.

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

Referring to FIG. 7, the method for detecting partial discharge of a gas insulated switch according to an embodiment of the present invention includes setting the operation mode to one of the first mode and the second mode (S10), and determining the different positions of the gas insulated switch. A step (S20) of receiving an electromagnetic wave signal from a plurality of electromagnetic wave sensors disposed in the first mode, and analyzing the pattern of the electromagnetic wave signal to determine whether partial discharge occurs in the gas insulated switch. It may include a step (S30) and, when the set operation mode is the second mode, calculating the location where the electromagnetic wave is generated in the gas insulated switch using the electromagnetic wave signal detection points of the plurality of electromagnetic wave sensors (S40). there is.

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

In the above, the present invention has been described by way of examples, 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 can do so without departing from the gist of the invention as claimed in the patent 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 location calculation unit
150: surge protection unit
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: Breaker

Claims (1)

A sensor unit including a plurality of electromagnetic wave sensors disposed at different positions of the gas insulated switch and detecting electromagnetic waves;
a high-frequency switch unit that controls the movement path of the electromagnetic wave signal transmitted from the sensor unit through a switching operation;
a partial discharge determination unit that receives an electromagnetic wave signal from the high-frequency switch unit and analyzes a pattern of the electromagnetic wave signal to determine whether a partial discharge occurs in the gas insulated switch; and
A location calculation unit that receives the electromagnetic wave signal from the high-frequency switch unit and calculates the location of the electromagnetic wave detected by the sensor unit using the electromagnetic wave detection 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 breaker, a second electromagnetic wave sensor disposed between the first breaker and the second breaker, and a second electromagnetic wave sensor disposed between the second breaker and the third breaker. It includes 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 uses the following equation:

Calculate the location of occurrence of the electromagnetic wave detected by the sensor unit by applying the attenuation coefficient α and the viewpoint difference value △,
Among the first, second, third and fourth electromagnetic wave sensors, the detection time difference value between the electromagnetic wave sensor that detected the electromagnetic wave first and the adjacent electromagnetic wave sensor is applied to △, and each of the electromagnetic wave sensors not involved in △ and the Calculate the attenuation coefficient α using the detection point difference values of the electromagnetic wave sensor involved in Δ,
Here, d is the distance between one of the first to fourth electromagnetic wave sensors and the location of generation of the electromagnetic wave, D is the distance between one of the first to fourth electromagnetic wave sensors and the other, and C is the speed of light,
The partial discharge determination unit,
Partial discharge detection of a gas insulated switch that outputs waveforms of electromagnetic wave signals transmitted from each of the plurality of electromagnetic wave sensors, and starts storage and pattern analysis of the waveforms when the peak value of one of the waveforms exceeds a reference value. Device.