JP2022158192A - Partial discharge position locating device, partial discharge position locating method, and program - Google Patents

Abstract

To highly precisely locate an occurrence position of a partial discharge at lower costs and within an operationally required range.SOLUTION: A partial discharge position locating device 600 acquires waveform data as a detection result of electromagnetic waves generated when a partial discharge occurs by at least one sensor 190 installed in a gas-insulated switchgear 100. The partial discharge position locating device 600 acquires frequency spectra of the acquired waveform data, and determines whether space existing in an occurrence position CP of a partial discharge is within busbar housing spaces 170a to 170b formed by busbar partial spaces 171a to 174a, and 171b to 174b of at least one unit 110, or within one of branch line housing spaces 180a to 180d of at least one unit 110 on the basis of presence or absence of deviation of distribution of the acquired frequency spectra.SELECTED DRAWING: Figure 6

Description

The present invention relates to a partial discharge positioning device, a partial discharge positioning method, and a program.

Patent Documents 1 to 4 disclose techniques for locating the position of partial discharge generation inside a gas insulated switchgear (GIS).
In Patent Document 1, sensors for detecting signals of electromagnetic waves generated when partial discharge occurs inside the gas-insulated switchgear are installed at a plurality of positions of the gas-insulated switchgear, and the electromagnetic waves detected by the sensors are detected. It is described that the location of occurrence of partial discharge is determined by comparing the magnitudes of the received signals.

In Patent Document 2, a first sensor and a second sensor for detecting a potential difference of a voltage surge of partial discharge generated inside a gas-insulated switchgear are installed on a flange of a tank of the gas-insulated switchgear. It describes locating the position of occurrence of partial discharge based on the time difference between the signals obtained by the first sensor and the second sensor.

Patent Document 3 discloses a gas insulated switchgear for each gas zone of a gas insulated switchgear in which a small diameter portion having an inner diameter smaller than the inner diameter of a tank is formed between a plurality of gas zones separated by insulating spacers. A sensor is installed to detect the electromagnetic wave signal generated when partial discharge occurs inside, and whether the signal detected by each sensor contains a frequency component below the cutoff frequency determined by the inner diameter of the small diameter part. It is described that it is determined in which gas division a partial discharge has occurred.

In Patent Document 4, sensors for detecting signals of electromagnetic waves generated when partial discharge occurs inside the gas-insulated switchgear are installed at a plurality of positions of the gas-insulated switchgear, and the electromagnetic waves detected by the sensors are and the installation positions of a plurality of sensors, it is described that the position with the maximum spectral intensity is determined as the position of occurrence of partial discharge.

JP-A-1-298907 JP-A-6-174778 JP 2010-210574 A JP-A-3-15771

However, the signal strength (detection strength) when the sensor receives electromagnetic waves generated by partial discharge decreases exponentially as the propagation distance increases. may be higher than the detection intensity of the relatively shorter one (see, for example, FIG. 3, which will be described later). For this reason, only a simple comparison of the detected intensity of the electromagnetic wave, such as the technique described in Patent Document 1, may result in an erroneous determination of the occurrence position of the partial discharge. In order to suppress such an erroneous determination, it is conceivable to reduce the distance between the sensors, but this requires a large number of sensors. Therefore, a device for locating the position of occurrence of partial discharge becomes expensive.

Further, in the technique described in Patent Document 2, the position of occurrence of partial discharge is determined based on the time difference between signals obtained by two sensors. Therefore, in order to locate the position of occurrence of partial discharge with high accuracy, a measuring instrument capable of simultaneous measurement technology of a plurality of sensors with high accuracy, for example, on the order of 10 ^-9 seconds is required. Therefore, a device for locating the position of occurrence of partial discharge becomes expensive.

In addition, the technique described in Patent Document 3 requires a number of sensors corresponding to the number of gas divisions. Therefore, a large number of sensors are required according to the scale of the gas-insulated switchgear. Therefore, a device for locating the position of occurrence of partial discharge becomes expensive.

Further, in the technique described in Patent Document 4, it is necessary to obtain the position where the spectral intensity is maximum from the relationship between the spectral intensity of the frequency spectrum of the electromagnetic waves and the installation positions of the plurality of sensors. Therefore, the calculation load for locating the position of occurrence of partial discharge increases. Therefore, a device for locating the position of occurrence of partial discharge becomes expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems described above, and is intended to enable the location of partial discharge generation in a gas-insulated switchgear to be located at a lower cost and with a high degree of accuracy within a range necessary for operation. The purpose is to

The partial discharge position locating apparatus of the present invention has one or more unit units in which a busbar partial space for partially housing a busbar and a branch line housing space for housing a branch line branched from the busbar are formed. A partial discharge locating device for locating the position of partial discharge generated in a gas-insulated switchgear, wherein at least one sensor installed in the gas-insulated switchgear detects electromagnetic waves generated when the partial discharge occurs. and a locating unit for locating the occurrence position of the partial discharge based on the waveform data, wherein the locating unit acquires the frequency spectrum of the waveform data Based on the frequency spectrum acquisition unit and the presence or absence of bias in the distribution of the frequency spectrum, the space in which the partial discharge generation position exists is within the bus bar accommodation space formed by the bus bar partial spaces of the one or more unit units. and a frequency spectrum determination unit that determines whether it is within the branch line accommodation space of any one of the one or more unit units.

The partial discharge locating method of the present invention has one or more unit units inside which are formed a busbar partial space for partially housing a busbar and a branch line housing space for housing a branch line branched from the busbar. A partial discharge position locating method for locating the position of partial discharge generated in a gas-insulated switchgear, wherein at least one sensor installed in the gas-insulated switchgear detects electromagnetic waves generated when the partial discharge occurs. and a locating step of locating the occurrence position of the partial discharge based on the waveform data, wherein the locating step acquires the frequency spectrum of the waveform data Based on the frequency spectrum acquisition step and the presence or absence of bias in the distribution of the frequency spectrum, the space where the partial discharge generation position exists is within the bus bar accommodation space formed by the bus bar partial spaces of the one or more unit units. and a frequency spectrum determination step of determining whether it is within the branch line accommodation space of any one of the one or more unit units.

A program of the present invention is for causing a computer to function as each part of the partial discharge positioning apparatus.

ADVANTAGE OF THE INVENTION According to this invention, the generation position of the partial discharge in a gas insulated switchgear can be determined at low cost and with high precision within the range necessary for operation.

1 is a plan view showing an example of the configuration of a partial discharge positioning system for a gas-insulated switchgear; FIG. FIG. 1B is a cross-sectional view of a unit constituting the gas-insulated switchgear, and is a cross-sectional view taken along the line II of FIG. 1A. 1B is a circuit diagram of a gas-insulated switchgear corresponding to FIG. 1A; FIG. It is a figure which shows an example of arrangement|positioning of a sensor. It is a figure which shows an example of the relationship between propagation distance and detection intensity. FIG. 2 is a diagram showing an example configuration of a test apparatus for obtaining a frequency spectrum of waveform data detected by a sensor; FIG. 4 is a diagram showing a first example of a frequency spectrum of waveform data corresponding to a simulated signal; FIG. 10 is a diagram showing a second example of the frequency spectrum of waveform data according to the simulated signal; It is a figure which shows an example of a functional structure of a partial discharge localization apparatus. It is a flowchart explaining an example of a partial discharge localization method.

An embodiment of the present invention will be described below with reference to the drawings.
It should be noted that the same length, position, size, interval, etc., for comparison means that they are strictly the same, as well as those that differ within the scope of the invention (for example, tolerances determined at the time of design). different within the range) are also included.

FIG. 1A is a diagram showing an example of the configuration of a partial discharge positioning system 1 for a gas-insulated switchgear 100. FIG. FIG. 1B is a cross-sectional view of the unit 110 that constitutes the gas-insulated switchgear 100, and shows the II cross section of FIG. 1A. 1C is a circuit diagram of the gas-insulated switchgear 100 corresponding to FIG. 1A.
As shown in FIGS. 1A and 1C, the partial discharge locating system 1 includes one or more sensors 190 installed in the gas insulated switchgear 100 and a partial discharge locating device 600. FIG. The sensor 190 and the partial discharge position locating device 600 are connected by wire or wirelessly, and the detection result by the sensor 190 is configured to be input to the partial discharge position locating device 600 .
Each of these configurations will be described below.

<Gas insulated switchgear>
1A and 1C, the gas-insulated switchgear 100 includes one or more unit units 110 (four unit units 110a to 110d in this embodiment). A plurality of unit units 110a to 110d have the same configuration, and FIG. 1B is a representative cross-sectional view of one unit unit 110d. The gas-insulated switchgear 100 is constructed by coupling (connecting in a row) a plurality of units 110a to 110d. The number of units 110 included in the gas-insulated switchgear 100 is arbitrary according to the scale, and may be one or more.

Each unit 110a-110d has a hollow space. Units 110a to 110d are connected to each other using, for example, a flange joint (not shown) provided in a sealed container portion forming a busbar accommodation space to be described later. The hollow spaces of the unitary units 110a to 110d communicate with each other when the unitary units 110a to 110d are combined. A hollow space of the gas-insulated switchgear 100 is formed by the hollow space of each unit 110a to 110d. The hollow space of the gas-insulated switchgear 100 is in a sealed state, and the hollow space of the gas _- insulated switchgear 100 is filled with insulating gas such as SF6 gas (sulfur hexafluoride gas).

The hollow space of the gas-insulated switchgear 100 accommodates busbars 120a-120b, branch lines 130a-130d, disconnecting switches 140a-140d, circuit breakers 150a-150d, and cable heads 160a-160d. In FIG. 1A, the buses 120a and 120b and the branch wires 130a to 130d cannot actually be seen from the outside of the gas insulated switchgear 100. , 120b are indicated by dashed lines, branch lines 130a to 130d are indicated by dashed lines, and an outline of a perspective view thereof is shown. Also, as shown in FIGS. 1A and 1C, a double-bus power system is exemplified here as the extra high-voltage power system. However, the number of busbars accommodated in the gas-insulated switchgear should be one or more.

The busbars 120a-120b are electric wires that function as conductors of the main circuit, receive all the current from the upper power system, and distribute the potential to the branch lines 130a-130d. The branch lines 130a-130d connect disconnecting switches 140a-140d, circuit breakers 150a-150d, and cable heads 160a-160d in series, and load (not shown) connected to busbars 120a-120b and cable heads 160a-160d It functions as a conductor for connecting to an electrical device (see FIGS. 1B to 1C). It should be noted that connecting means electrically connecting. This also applies to other explanations.

The disconnectors 140a to 140d open and close when no current flows in the circuit. In FIG. 1C, the disconnecting switches 140a to 140d include electric wires 131a to 131d connected to the bus 120a among the branch lines 130a to 130d, and electric wires 132a to 132d connected to the bus 120b among the branch lines 130a to 130d. , to indicate the state of no connection. However, the disconnecting switches 140a to 140d normally open and close so as to connect to one of the electric wires 131a to 131d and the electric wires 132a to 132d and not connect to the other. The disconnecting switches 140a to 140d, for example, switch the power transmission system (buses 120a to 120b) or reliably remove loads (electrical equipment) connected to the cable heads 160a to 160d from the main circuit when performing maintenance and inspection. used for separating.

The circuit breakers 150a to 150d have a function of interrupting load currents flowing through loads (electrical equipment) (not shown) connected to the cable heads 160a to 160d. When a fault current occurs due to a ground fault, a short circuit, or the like, the circuit breakers 150a to 150d automatically open to prevent the fault current from flowing to the load.

The cable heads 160a to 160d are connected to loads (electrical equipment) not shown. Current flowing from the busbars 120a-120b via the disconnecting switches 140a-140d and the circuit breakers 150a-150d is supplied from the cable heads 160a-160d to a load (electrical equipment) (not shown) as a load current.

As shown in FIGS. 1A and 1B, the hollow space of the gas-insulated switchgear 100 includes busbar housing spaces 170a-170b corresponding to the spaces housing the busbars 120a-120b and spaces housing the branch wires 130a-130d. , and branch line accommodation spaces 180a to 180d corresponding to . The above-mentioned busbar accommodation space is formed by connecting one or more unit units 110 (110a to 110d) in a row, thereby forming busbar partial spaces 171a to 174a and 171b to 174b in each of the unit units 110a to 110d. It is a space formed inside the gas-insulated switchgear 100 by connecting in one direction (extending direction of the busbars 120a and 120b). In the example shown in FIG. 1A, inside each unit 110, two busbar portion accommodation spaces 170a-170b and one branch wire accommodation space 180a-180d are formed. For this reason, the gas insulated switchgear 100 includes two busbar housing spaces 170a to 170b extending in the longitudinal direction of the busbars 120a to 120b, and the same number (four) as the number of the unit units 110 in the direction orthogonal to the busbars 120a to 120b. branch line accommodating spaces 180a to 180d extending to the branch line. In FIGS. 1A and 1B, the busbar accommodation spaces 170a-170b are shown in relatively dark gray, and the branch wire accommodation spaces 180a-180d are shown in relatively light gray. In addition, the number of the bus bar accommodation spaces which the gas insulated switchgear 100 has should just be one or more.

Since the gas-insulated switchgear 100 itself can be realized by a known technique, only the outline of the gas-insulated switchgear 100 has been described here. Further, the gas-insulated switchgear is not limited to the gas-insulated switchgear 100 shown in FIGS. 1A to 1C, and may be various known pipe-type gas-insulated switchgears.

<Sensor>
One or more sensors are installed in the gas-insulated switchgear 100 according to the scale of the device such as the number of unit units. Since the gas-insulated switchgear 100 usually has a plurality of units, a plurality of sensors are installed. In this embodiment, one sensor 190a to 190f is installed in each of the two busbar accommodation spaces 170a to 170b and the four branch wire accommodation spaces 180a to 180d described above. In FIG. 1A, the sensors 190a to 190f cannot actually be seen from the outside of the gas insulated switchgear 100, but the sensors 190a to 190f are indicated by dotted lines in order to facilitate understanding of the relationships among the figures. , shows an outline of a state in which these are seen through.

When partial discharge occurs in the bus lines 120a to 120b and branch lines 130a to 130d as a sign of an internal accident (short circuit accident, ground fault, etc.) of the gas insulated switchgear 100, electromagnetic waves are generated starting from the positions where the partial discharges occur. . The sensors 190a to 190f are sensors that detect electromagnetic waves (hereinafter simply referred to as electromagnetic waves) generated by this partial discharge and output detection values according to the intensity of the detected electromagnetic waves. In this embodiment, as the sensors 190a to 190f, sensors that include UHF (Ultra High Frequency) antennas and output voltage values corresponding to the intensity of electromagnetic waves are exemplified.

FIG. 2 is a diagram showing an example of arrangement of the sensors 190a. In FIG. 2 , the electromagnetic wave propagating from the partial discharge generation position CP generated inside the gas-insulated switchgear 100 (the bus 120a) is indicated by a dashed line. In FIG. 2, the insulating spacer 210 is a member for supporting the busbar 120a. Such insulating spacers are also installed on busbar 120b and branch lines 130a-130d.

In the example shown in FIG. 2, the sensor 190a is arranged in a concave portion of the inner wall surface of the gas-insulated switchgear 100 so that the detection surface of the sensor 190a is exposed to the hollow space (the bus bar housing space 170a) of the gas-insulated switchgear 100. placed. The other sensors 190b to 190f are also arranged so that the detection surfaces of the sensors 190b to 190f are exposed to the hollow space (the bus bar accommodation space 170b and the branch wire accommodation spaces 180a to 180d) of the gas insulated switchgear 100, similarly to the sensor 190a. placed in

<Knowledge>
Next, the findings obtained by the inventors will be described with reference to FIG.
The present inventors detected the above-mentioned electromagnetic waves with the propagation distance, which is the distance along the propagation path of the electromagnetic wave from the generation position CP of the partial discharge generated inside the gas-insulated switchgear 100 to the sensor installation position, and the sensor. The relationship between the detection intensity indicating the magnitude of the detection value (for example, voltage value) actually obtained and the relationship was investigated. Here, the above detection intensity is defined as a crest value (maximum value of amplitude) in time-series data (hereinafter also referred to as waveform data) of detection values obtained when the above electromagnetic waves are detected. However, the above detection intensity is not limited to the peak value, and may be, for example, the effective value or the peak-to-peak value of the waveform. FIG. 3 is a diagram showing an example of the relationship between propagation distance and detection intensity. In FIG. 3, R ² is the coefficient of determination for the approximated curve 310 obtained by regression analysis from the square points shown in FIG.

As shown in FIG. 3, the detected intensity decreases exponentially as the propagation distance increases. However, there are cases where the detected strength in the relatively long propagation distance is higher than the detected strength in the relatively short propagation distance due to variations in the detection strength at the time of detection by the sensor. Specifically, in FIG. 3, there are plot points with a higher detection intensity near the propagation distance of 10 m than those near 6 to 7 m. Therefore, it can be seen that an erroneous determination may occur in the position evaluation of the partial discharge generation position CP only by comparing the magnitude relationship of the detected intensities.

On the other hand, the present inventors determined whether the position where the partial discharge is generated is the bus line accommodation space or the branch line accommodation space based on the frequency spectrum of the signal waveform of the electromagnetic wave received by the sensor installed in the branch line accommodation space. found that it is possible to More specifically, a simulated signal, such as a pulse signal, simulating the electromagnetic wave caused by partial discharge is generated in the bus line accommodation space or the branch line accommodation space. For example, when the simulated signals are generated in the branch line accommodating spaces 180a to 180d, they can be generated by using one of the sensors 190c to 190f as shown in FIG. This simulated signal is detected by each sensor installed in the branch line accommodation space. The frequency spectrum was obtained by frequency analysis. FIG. 4 is a diagram showing an example of the configuration of a testing device for obtaining the frequency spectrum of the waveform data.

A pulse generator 410 is connected to one of the sensors 190a-190f. FIG. 4 illustrates a state in which the pulse generator 410 is connected to the sensor 190f. Also, an oscilloscope 420 is connected to all sensors 190a-190f. As previously mentioned, sensors 190a-190f are equipped with UHF antennas. A simulated signal is output from the pulse generator 410 to the sensor 190f connected to the pulse generator 410, and the simulated signal is transmitted from the sensor 190f. The waveform data corresponding to the simulated signal received by the sensors 190a to 190e other than the sensor 190f connected to the pulse generator 410 is acquired by the oscilloscope 420, and the frequency analysis is performed by the analysis PC 430 to obtain the frequency spectrum. A run was made for each of the sensors 190a-190e. Obtaining the frequency spectrum as described above was performed by changing the sensor connected to the pulse generator 410 (that is, the sensor that transmits the simulated signal).

5A and 5B are diagrams showing a first example and a second example of the frequency spectrum of the above waveform data. In FIGS. 5A and 5B, the unit of spectral intensity (intensity of frequency spectrum) is dimensionless ([-] on the vertical axis indicates that the unit is dimensionless).
In FIG. 5A, the frequency spectrum 510 (solid line) is waveform data corresponding to the simulated signal received by the sensor 190d when the sensor transmitting the simulated signal is the sensor 190c installed in the branch line accommodation space 180a. frequency spectrum. A frequency spectrum 520 (broken line) is the frequency spectrum of the waveform data received by the sensor 190d when the sensor that transmits the simulated signal is the sensor 190b installed in the bus bar accommodation space 170b.

On the other hand, in FIG. 5B, frequency spectrum 530 is the frequency spectrum of the waveform data received by sensor 190e when the sensor transmitting the simulated signal is sensor 190f installed in branch line accommodation space 180d. A frequency spectrum 540 is the frequency spectrum of the waveform data received by the sensor 190e when the sensor transmitting the simulated signal is the sensor 190b installed in the bus bar accommodation space 170b.

In FIG. 5A , the distance between sensor 190c on the transmission side of the simulated signal and sensor 190d on the receiving side, which were used when obtaining frequency spectrum 510, is about twice the distance between the sensor 190b on the receiving side and the sensor 190d on the receiving side, but there is no great difference in the maximum value of the spectrum intensity in the frequency spectrum.

In FIG. 5B, the distance between the sensor 190f on the transmitting side of the simulated signal and the sensor 190e on the receiving side of the simulated signal used when obtaining the frequency spectrum 530 is the same as that of the simulated signal used when obtaining the frequency spectrum 540. Although it is about 1.4 times the distance between the sensor 190b on the transmitting side and the sensor 190e on the receiving side, there is no great difference in the maximum value of the spectrum intensity in the frequency spectrum.

On the other hand, in FIG. 5A, when the distributions of the frequency spectra 510 and 520 are compared, the frequency spectrum 510 has a frequency band of 850 MHz or more and 1100 MHz or less among the frequency bands included in the electromagnetic waves generated by the partial discharge. , and the peaks with high spectral intensity are concentrated in the region below 850 MHz. On the other hand, the frequency spectrum 520 has a smaller bias in the distribution between the frequency band of 850 MHz and higher and 1100 MHz and lower and the other frequency bands than the frequency spectrum 510, and it can be seen that peaks with high spectral intensity occur over a wide range.

Similarly, in FIG. 5B, when the distributions of the frequency spectra 530 and 540 are compared, the frequency spectrum 530 has a frequency band of 650 MHz or more and 1100 MHz or less among the frequency bands included in the electromagnetic waves generated by the partial discharge. It can be seen that there are fewer peaks with high spectral intensity than in the bands, and the peaks with high spectral intensity are concentrated in the region below 650 MHz. On the other hand, the frequency spectrum 540 has a smaller bias in the distribution between the frequency band of 650 MHz and higher and 1100 MHz and lower than the other frequency bands as compared to the frequency spectrum 530, and it can be seen that peaks with high spectral intensity occur over a wide range.

Frequency spectra 510 and 530 are frequency spectra when the sensors transmitting the simulated signals are the sensors 190c and 190f installed in the branch line accommodation spaces 180a and 180d. On the other hand, frequency spectra 520 and 540 are frequency spectra when the sensor transmitting the simulated signal is the sensor 190b installed in the bus bar accommodation space 170b.

When the sensors on the transmission side of the simulated signal are installed in the branch line accommodating spaces 180a and 180d, the bias in the frequency spectrum distribution such as the frequency spectrums 510 and 530 shown in FIGS. 5A and 5B is significantly increased. On the other hand, when the sensor on the transmission side of the simulated signal is installed in the bus bar accommodation space 170b, the tendency that the bias of the frequency spectrum distribution such as the frequency spectrums 520 and 540 shown in FIGS. 5A and 5B is reduced is It was the same even if the combination of the sensor on the transmitting side and the sensor on the receiving side of the simulated signal was changed.

From the above, the present inventors have found that when partial discharge occurs in the branch line accommodation spaces 180a to 180d, the frequency spectrum distribution based on the waveform data output from the sensors 190a to 190f is relatively biased. On the other hand, the inventors have found that when partial discharge occurs in the busbar accommodation spaces 170a-170b, the deviation in the frequency spectrum distribution of the waveform data output from the sensors 190a-190f is relatively small.

Therefore, for example, when the frequency spectrum of the waveform data output from one sensor selected from the sensors 190a to 190f can be considered to have a bias in the frequency spectrum distribution, the partial discharge generation position CP is the branch line accommodation space. 180a to 180d, and otherwise, if it is determined that the partial discharge generation position CP is in the bus accommodation space 170a to 170b, the partial discharge generation position CP can be located. Here, the actual partial discharge generation position CP is a limited space of the busbar accommodation spaces 170a-170b (busbars 120a-120b) and the branch wire accommodation spaces 180a-180d (branch wires 130a-130d). However, the disconnecting switches 140a-140d and the circuit breakers 150a-150d cut off the electric power in units of the busbar accommodation spaces 170a-170b or the branch wire accommodation spaces 180a-180d. Therefore, there is no practical problem if the partial discharge generation position CP can be located for each of the busbar accommodation spaces 170a to 170b or the branch wire accommodation spaces 180a to 180d.

Whether or not the distribution of the frequency spectrum can be considered biased can be determined, for example, by analyzing the frequency spectrum in the high frequency band on the higher frequency side than the specified frequency and the frequency in the low frequency band on the lower frequency side than the specified value. It is determined based on the result of comparison between the analysis value of the spectrum and the result of comparison. Here, for example, in the distribution of the frequency spectrum of the waveform data output from the sensors 190a to 190f, the peaks are biased toward the low frequency band side (or high frequency band side) rather than the high frequency band side (or low frequency band side). A frequency value is set as the prescribed frequency, such that it is possible to determine whether or not there is an imbalance in the distribution of the frequency spectrum of the waveform data. For example, the prescribed frequency may be set to a frequency value near the center of the entire frequency spectrum distribution (excluding the noise portion) caused by electromagnetic waves of partial discharge obtained through experiments. Alternatively, from the difference in frequency spectrum distribution obtained according to the presence or absence of partial discharge through experiments, etc., a frequency value that can determine the presence or absence of partial discharge is selected and used as the above specified frequency. May be set. Further, the specified frequency may be set according to various conditions such as the internal structure and installation state of the target gas-insulated switchgear.

In the present embodiment, the prescribed frequencies are, for example, 850 MHz and 650 MHz, which are the upper limits of the frequency band where peaks with high spectral intensity concentrate in the frequency spectra 510 and 530 based on the waveform data output from the sensors 190c and 190f. It is selected from within the range of upper limit and lower limit (650 MHz or more and 850 MHz or less). The prescribed frequency may be, for example, 650 MHz, 850 MHz, or the average of these frequencies, 750 MHz. Also, the upper limit of the high frequency band may be determined as the prescribed frequency. The upper limit value of the high frequency band on the higher frequency side than the specified frequency may be, for example, 1100 MHz or 1050 MHz depending on the assumed upper limit value of the frequency band included in the electromagnetic waves generated by partial discharge.

An analysis value of the frequency spectrum is, for example, an integral value. Also, the ratio of the number of peaks whose spectral intensity exceeds the threshold in the high frequency band on the higher frequency side than the specified frequency to the total number of peaks in the frequency spectrum in all frequency bands, or the number of peaks in the frequency spectrum in all frequency bands The ratio of the number of peaks whose spectrum intensity exceeds the threshold in the low frequency band on the lower frequency side than the specified frequency to the total number may be used as the analysis value of the frequency spectrum.

<Partial discharge positioning device>
FIG. 6 is a diagram showing an example of a functional configuration of the partial discharge positioning device 600. As shown in FIG. The hardware of the partial discharge positioning device 600 is, for example, a processor, a storage device such as a main memory device or an external storage device, and an information processing device (computer) equipped with various interfaces, or by using dedicated hardware Realized. Further, the partial discharge positioning device 600 may include various signal processing circuits. The partial discharge localization device 600 may also include a spectrum analyzer.

The partial discharge position locating device 600 is a device for locating the generation position CP of the partial discharge generated inside the gas-insulated switchgear 100 . As shown in FIG. 6, the partial discharge positioning device 600 includes a detection value acquisition unit 610, a storage unit 620, a detection unit 630, a waveform data acquisition unit 640, and an orientation unit 650. When an electric discharge occurs, it is configured so that the location of the occurrence can be determined. Moreover, in this embodiment, the partial discharge localization device 600 further includes an output unit 660 . Each of these functional units will be described. Note that the functions of the storage unit 620 may be included in a device other than the partial discharge positioning device 600 . In this case, the partial discharge positioning device 600 accesses the storage unit 620 by communicating with the other device.

<<Detected Value Acquisition Unit 610, Storage Unit 620>>
The detected value acquiring unit 610 acquires detected values detected by one or more sensors 190 installed in the gas insulated switchgear 100 and stores them in the storage unit 620 . In the present embodiment, the detected value acquiring unit 610 acquires the detected values detected by the sensors 190 (sensors 190a to 190f) at a prescribed sampling period in a predetermined acquisition order. Detected value acquisition unit 610 identifies sensor 190 that has detected the detected value based on the order of acquisition of the detected value. Detected value acquiring unit 610 stores the detected value detected by each sensor 190 in a storage area for each sensor 190 set in storage unit 620 (an external storage device that is an example of hardware constituting storage unit 620). Memorize (accumulate). Note that the detection value acquiring unit 610 does not necessarily acquire the detection values in a predetermined order of acquisition. For example, the detection values may be sent to the partial discharge position locating device 600 with information identifying the sensor 190 added. In this case, the detection value acquisition unit 610 identifies the sensor 190 that detected the detection value based on the information added to the detection value.

<<detection unit 630>>
The detection unit 630 determines whether partial discharge occurs in the gas-insulated switchgear 100 based on the detection value detected by one or more sensors 190 among the one or more sensors 190 installed in the gas-insulated switchgear 100. to detect. The detection unit 630 only needs to acquire the detection value of each sensor 190 within a range necessary for detecting the occurrence of partial discharge, such as determining at least a part of the plurality of sensors 190 as a monitoring target. A detection value may be acquired, or a detection value of some sensors 190 may be acquired. In this embodiment, the detection section 630 includes a first intensity acquisition section 631 and a sensor determination section 632 .

<<<first intensity acquisition unit 631>>>
The first intensity acquisition section 631 acquires the detection intensity of each sensor 190 (190a to 190f). This detection strength is not particularly limited as long as it indicates the magnitude of the detection value detected by the sensor 190 . For example, the value itself (instantaneous value) detected by each sensor 190 may be used, or a statistical value calculated based on a plurality of instantaneous values such as an average value of instantaneous values in a specified period may be used. Alternatively, the detected intensity may be a crest value obtained from waveform data or a statistical value thereof, as already described. In this embodiment, the detected intensity acquired by the first intensity acquisition unit 631 is an instantaneous value. Also, the first intensity acquisition unit 631 acquires the detection intensity for each sensor based on one or more detection values stored in the storage unit 620 .

<<<sensor determination unit 632>>>
The sensor determination unit 632 determines whether the detection intensity acquired by the first intensity acquisition unit 631 exceeds the threshold for each detection intensity of the sensors 190 (190a to 190f). When there is at least one sensor 190 whose detection intensity exceeds the threshold, it can be determined that an electromagnetic wave has been detected inside the gas-insulated switchgear 100, and it can be determined that a partial discharge has occurred in the gas-insulated switchgear 100. . On the other hand, if there is no sensor 190 whose detection intensity exceeds the threshold, it is determined that partial discharge has not occurred in the gas-insulated switchgear 100 .

The threshold may be determined, for example, as follows. That is, the minimum value of the detected intensity output from each sensor 190 (190a to 190f) when partial discharge occurs is investigated in advance, and a value equal to or greater than the investigated minimum detected intensity is set as the threshold value. The threshold may be set individually for each sensor 190 (190a-190f), or the same value may be set for all the sensors 190 (190a-190f).

Further, when there is only one sensor 190 whose detection intensity exceeds the threshold, the sensor determination unit 632 determines the space in which the sensor 190 is installed among the bus line accommodation spaces 170a to 170b and the branch line accommodation spaces 180a to 180d. It is determined as the partial discharge generation position CP.

<<Waveform Data Acquisition Unit 640>>
The waveform data acquisition unit 640 acquires waveform data of one or more sensors 190 out of one or more sensors 190 installed in the gas insulated switchgear 100 . The waveform data acquisition unit 640 may acquire waveform data for each sensor 190 within a range necessary for locating the partial discharge generation position CP. Waveform data from sensor 190 may be obtained. When acquiring waveform data from a plurality of sensors 190, each waveform data may contain detection values in the same time period, or at least one waveform data may contain detection values in a different time period from other waveform data. May contain values. Also, the waveform data may include data of a plurality of detected values that form at least one cycle of the waveform. The waveform data acquisition section 640 acquires necessary waveform data by acquiring a plurality of detection values from the storage area of each sensor 190 in the storage section 620 . In this embodiment, the waveform data acquisition unit 640 is activated when the sensor determination unit 632 determines that there are two or more sensors 190 whose detection strength exceeds the threshold.

<<orientation unit 650>>
The locating unit 650 locates the generation position CP of the partial discharge generated inside the gas insulated switchgear 100 based on at least one waveform data among the waveform data for each sensor 190 acquired by the waveform data acquiring unit 640. do. In this embodiment, the orientation unit 650 includes a frequency spectrum acquisition unit 651 , a frequency spectrum determination unit 652 , a second intensity acquisition unit 653 and an identification unit 654 . In this embodiment, the orientation unit 650 is activated after the sensor determination unit 632 determines that there are two or more sensors whose detection intensity exceeds the threshold, and the waveform data acquisition unit 640 acquires waveform data. do.

<<<Frequency Spectrum Acquisition Unit 651>>>
The frequency spectrum acquisition section 651 calculates and acquires the frequency spectrum of the waveform data acquired by the waveform data acquisition section 640 . FFT, for example, is used to calculate the frequency spectrum. In this embodiment, the frequency spectrum acquisition unit 651 selects from among the plurality of sensors 190c to 190f installed in the branch line accommodation spaces 180a to 180d, the detection unit 630 (sensor determination unit 632) when the detected intensity exceeds the threshold. One of the determined sensors 190 is selected, and the frequency spectrum of the waveform data of the selected sensor 190 is calculated and obtained. Among the plurality of sensors 190c to 190f installed in the branch line accommodation spaces 180a to 180d, when there are a plurality of sensors 190 whose detection intensity exceeds the threshold value by the detection unit 630 (sensor determination unit 632), the frequency spectrum For example, the acquisition unit 651 calculates and acquires the frequency spectrum of the waveform data of the sensor 190 having the maximum detection intensity acquired by the first intensity acquisition unit 631 . However, the present invention is not limited to this embodiment, and the frequency spectrum acquisition unit 651 may acquire the frequency spectrum of the waveform data of the sensor 190 whose detection intensity is not the maximum. For example, the frequency spectrum acquisition unit 651 may acquire the frequency spectrum of 190 waveform data having detection intensities closest to the detection intensities preset as the detection intensities corresponding to the occurrence of partial discharge.

<<<Frequency Spectrum Determining Unit 652>>>
The frequency spectrum determination unit 652 determines whether the occurrence position CP of the partial discharge generated inside the gas insulated switchgear 100 is 1 It is determined whether it is the bus line accommodation spaces 170a to 170b of the above unit units 110 (110a to 110d) or the branch line accommodation spaces 180a to 180d of one or more unit units 110 (110a to 110d).

In the present embodiment, the frequency spectrum determination unit 652 satisfies the frequency distribution condition indicating that the distribution of the frequency spectrum of the waveform data acquired by the frequency spectrum acquisition unit 651 can be considered to be unbiased, the occurrence position of partial discharge. A case will be exemplified where it is determined that the CP is one of the bus line accommodating spaces 170a to 170b, and if the frequency distribution condition is not satisfied, it is determined that the partial discharge generation position CP is one of the branch line accommodating spaces 180a to 180d.

More specifically, in this embodiment, the prescribed frequency mentioned above is set to 750 MHz. Also, the first frequency band is 750 MHz to 1100 MHz, and the second frequency band is 400 MHz to 1100 MHz. Then, the case where the frequency distribution condition is that the ratio of the integrated value of the frequency spectrum of the waveform data in the first frequency band to the integrated value (area) of the frequency spectrum of the waveform data in the second frequency band is greater than or equal to a threshold is illustrated. do.

The threshold may be determined, for example, as follows. That is, using the test equipment (pulse generator 410, oscilloscope 420, and analysis PC 430) shown in FIG. Calculation of the frequency spectrum of the corresponding waveform data is performed by changing the combination of the sensor on the transmitting side and the sensor on the receiving side of the simulated signal. In each frequency spectrum thus obtained, the ratio of the integrated value of the frequency spectrum of the waveform data in the first frequency band to the integrated value of the frequency spectrum of the waveform data in the second frequency band is calculated, and the calculated ratio A value equal to or greater than the minimum value of is set as the threshold. For example, the threshold is 0.4.

<<<Second intensity acquisition unit 653>>>
The second intensity acquisition unit 653 detects at least the above-described detection unit in any of the accommodation spaces (the bus line accommodation spaces 170a to 170b or the branch line accommodation spaces 180a to 180d) determined by the frequency spectrum determination unit 652 described above. The detection intensity (described above) of each sensor 190 determined by 630 to have detected an electromagnetic wave is obtained. In this embodiment, the detected strength is the crest value, and the second strength acquisition unit 653 calculates the required detected strength for the sensor 190 based on the detected value for each sensor 190 stored in the storage unit 620 . However, the present invention is not limited to this embodiment. The detection intensity acquired by the second intensity acquisition unit 653 may be of the same type as the detection intensity acquired by the first intensity acquisition unit 631 . In this case, by storing the calculation result of the first intensity acquisition unit 631 in a predetermined storage area of the storage unit 620, the second intensity acquisition unit 653 can obtain the required detection intensity of the sensor 190 from the storage area. can be obtained.

That is, the first intensity acquisition unit 631 described above acquires the detection intensity of each sensor 190 (190a to 190f) in order to detect whether or not partial discharge occurs in the gas-insulated switchgear 100. FIG. On the other hand, according to the determination result of the frequency spectrum determination unit 652, the second intensity acquisition unit 653 provides each sensor 190 (190a to 190b, 190c to 190f) for each of the bus line accommodation spaces 170a to 170b or each of the branch line accommodation spaces 180a to 180d. Get the detection strength of

Specifically, when the frequency spectrum determination unit 652 determines that the partial discharge generation position CP is in the busbar accommodation spaces 170a to 170b, the second intensity acquisition unit 653 selects sensors installed in the busbar accommodation spaces 170a to 170b. Among 190a to 190b, the detection intensity of the sensor determined by the sensor determination unit 632 to exceed the threshold value is acquired. On the other hand, when the frequency spectrum determination unit 652 determines that the partial discharge generation positions CP are in the branch line accommodation spaces 180a to 180d, the second intensity acquisition unit 653 is installed in the branch line accommodation spaces 180a to 180d. Of the sensors 190c to 190f, the detection intensity of the sensor determined by the sensor determination unit 632 to exceed the threshold value is acquired. Note that the second intensity acquisition unit 653 detects all sensors installed in one of the accommodation spaces (the bus line accommodation spaces 170a to 170b or the branch line accommodation spaces 180a to 180d) determined by the frequency spectrum determination unit 652. It may be configured to obtain intensity.

<<<identification part 654>>>
Based on the result of determination by the frequency spectrum determination unit 652 and the detection intensity acquired by the second intensity acquisition unit 653, the identification unit 654 determines the generation position CP of the partial discharge generated inside the gas-insulated switchgear 100. identify. In other words, the identifying unit 654 identifies one sensor 190 closest to the partial discharge generation position CP. Specifically, the specifying unit 654 detects a plurality of sensors that have detected electromagnetic waves in one of the accommodation spaces (the bus line accommodation spaces 170a to 170b or the branch line accommodation spaces 180a to 180d) determined by the frequency spectrum determination unit 652. In the case of , the sensor that exhibits the maximum detection intensity is determined to be the sensor closest to the partial discharge generation position CP, and if there is only one sensor that has detected electromagnetic waves, that sensor is closest to the partial discharge generation position CP. The sensor is determined to be close, and the accommodation space in which the determined sensor is installed is specified as the space in which the partial discharge generation position CP exists.

In the present embodiment, the frequency spectrum determination unit 652 determines that the partial discharge generation positions CP are the busbar accommodation spaces 170a to 170b, and among the sensors 190a to 190b installed in the busbar accommodation spaces 170a to 170b, When a plurality of detection intensities are acquired by the second intensity acquisition unit 653 as the detection intensities of the sensors determined by the sensor determination unit 632 to exceed the threshold, the identification unit 654 selects one of the bus bar accommodation spaces 170a to 170b. , the bus bar accommodation space in which the sensor showing the maximum detection intensity is installed is determined as the partial discharge generation position CP.

On the other hand, the frequency spectrum determination unit 652 determines that the partial discharge generation position CP is in the busbar accommodation spaces 170a to 170b, and among the sensors 190a to 190b installed in the busbar accommodation spaces 170a to 170b, the sensor determination unit When one detection strength is acquired by the second strength acquisition unit 653 as the detection strength of the sensor whose detection strength is determined to exceed the threshold value by 632, the identification unit 654 detects the sensor without comparing the detection strengths. is set as the partial discharge generation position CP.

Further, the frequency spectrum determining unit 652 determines that the partial discharge generation position CP is in the branch line accommodation spaces 180a to 180d, and among the sensors 190c to 190f installed in the branch line accommodation spaces 180a to 180d, sensors When a plurality of detection intensities are acquired by the second intensity acquisition unit 653 as the detection intensities of the sensors determined by the determination unit 632 to exceed the threshold, the identification unit 654 selects one of the branch line accommodation spaces 180a to 180d. , the branch line accommodation space in which the sensor showing the maximum detection intensity is installed is determined as the partial discharge generation position CP.

On the other hand, the frequency spectrum determination unit 652 determines that the partial discharge generation position CP is in the branch line accommodation spaces 180a to 180d, and among the sensors 190c to 190f installed in the branch line accommodation spaces 180a to 180d, sensors When one detection strength is acquired by the second strength obtaining section 653 as the detection strength of the sensor for which the determination section 632 determines that the detection strength exceeds the threshold, the specifying section 654 does not compare the detection strengths. The branch line accommodation space in which the sensor is installed is determined as the partial discharge generation position CP.

<<output unit 660>>
The output unit 660 generates an operation signal for the disconnectors 140a to 140d and the circuit breakers 150a to 150d according to the partial discharge generation position CP located by the location unit 650, thereby generating the gas insulated switchgear 100 or the gas insulated switchgear. Output to a controller (not shown) that controls the operation of 100 .

When the partial discharge generation position CP located by the locating unit 650 is in the busbar accommodation space, the output unit 660 is connected to all the branch lines connected to the busbar accommodated in the busbar accommodation space. After opening all the breakers connected to the branch line, an operation signal is generated and output to indicate that all the disconnectors connected to the branch line are to be opened.

For example, it is assumed that the partial discharge generation position CP located by the locating unit 650 is the bus bar accommodation space 170a (bus bar 120a), and all the disconnectors 140a to 140d are connected to the electric wires 131a to 131d. In this case, the output unit 660 generates and outputs an operation signal indicating that the disconnectors 140a to 140d are to be disconnected from the electric wires 131a to 131d after all the circuit breakers 150a to 150d are opened. Further, the output unit 660 may generate and output an operation signal further indicating closing of the circuit breakers 150a-150d after connecting the disconnectors 140a-140d to the electric wires 132a-132d. These two operating signals may be used as one operating signal. Further, when the disconnecting switches 140a to 140d are disconnecting switches with a loop opening/closing function, the output unit 660, for example, connects the disconnecting switches 140a to 140d to the wires 132a to 132d (that is, connects the disconnecting switches 140a to 140d to the wires 132a to 132d). 131a-131d and 132a-132d), an operation signal may be generated and output to indicate disconnection of the disconnectors 140a-140d from the wires 131a-131d.

However, the functions of the output unit 660 are not limited to those described above. For example, the output unit 660 can notify the administrator or the like of the determined partial discharge generation position CP by using a display or speaker of the administrator's terminal in place of or together with the above-described control device. It may be connected to an informing device (not shown), and the determined partial discharge generation position CP may be output to the informing device (not shown). Along with this, the output unit 660 may output information that can specify the disconnector or circuit breaker to be operated. As a result, it becomes possible for the administrator to quickly grasp the occurrence of partial discharge and its occurrence position CP, and to manually operate the circuit breaker and the disconnecting switch.

In the following description, by operating the disconnecting switches 140a to 140d and the circuit breakers 150a to 150d as described above, the bus 120a or 120b is disconnected from loads (not shown) connected to the branch lines 130a to 130d. is also referred to as disconnecting the bus from the power grid.

Further, for example, it is assumed that the partial discharge generation position CP located by the locating unit 650 is the branch line accommodation space 180d (branch line 130d), and the disconnector 140d is connected to the electric wire 131d or 132d. In this case, after opening the circuit breaker 150d, the output unit 660 generates and outputs an operation signal indicating that the disconnecting switch 140d is disconnected from the electric wires 131d and 132d.

In the following description, branch line 130a, 130b, 130c or 130d is operated by operating disconnector 140a, 140b, 140c or 140d and circuit breaker 150a, 150b, 150c or 150d as described above. Disconnecting the loads (not shown) connected to the busbars 120a-120b from the buses 120a-120b is also referred to as disconnecting the loads from the power system.

<Operation flow chart>
Next, an example of a partial discharge position locating method using the above-described partial discharge position locating device 600 will be described with reference to the flowchart of FIG. At least part of the partial discharge positioning method may be performed manually without using the partial discharge positioning device 600 .

First, in step S701, the detection value acquisition unit 610 acquires detection values detected by the sensors 190 (sensors 190a to 190f) and stores them in the storage unit 620. FIG. In this embodiment, the detected value acquisition unit 610 identifies the sensor 190 that detected the detected value, and stores (accumulates) the detected value detected by each sensor 190 (sensors 190a to 190f) in the storage area of each sensor 190. )do.
Next, in step S702, the first intensity acquisition unit 631 acquires the detection intensity of each sensor 190 (190a to 190f) determined as monitoring targets based on the information stored in the storage unit 620. FIG.

Next, in step S703, the sensor determination unit 632 determines whether or not there is a sensor whose detection intensity obtained in step S702 exceeds the threshold. As a result of this determination, if there is no sensor whose detection intensity exceeds the threshold value (NO in step S703), partial discharge is not generated inside the gas insulated switchgear 100, so the processing according to the flowchart of FIG. 7 ends. .

On the other hand, if there is a sensor whose detection intensity exceeds the threshold (YES in step S703), the process of step S704 is executed. In step S704, the sensor determination unit 632 determines whether or not the number of sensors whose detection intensity exceeds the threshold value obtained in step S702 is one. As a result of this determination, if the number of sensors whose detection intensity exceeds the threshold is one (YES in step S704), the process of step S705 is executed.

In step S705, the sensor determination unit 632 selects, of the bus line accommodation spaces 170a to 170b and the branch line accommodation spaces 180a to 180d, the spaces in which the sensors whose detection intensities are determined to exceed the threshold in step S704 to be installed are partially discharged. generation position CP.

Next, in step S<b>706 , the output unit 660 generates an operation signal corresponding to the space determined in step S<b>705 and outputs it to the gas-insulated switchgear 100 or the control device that controls the operation of the gas-insulated switchgear 100 . Disconnectors 140a to 140d and circuit breakers 150a to 150d then operate according to the operation signal.

For example, if the partial discharge generation position CP determined in step S705 is the bus bar accommodation space 170a or 170b, the output unit 660 generates an operation signal indicating that the bus bar 120a or 120b should be cut off from the power system. Further, when the partial discharge generation position CP determined in step S705 is the branch line accommodation space 180a, 180b, 180c, or 180d, the output unit 660 outputs a load (not shown) connected to the branch line accommodation space. is disconnected from the power system. Along with this, an operation signal, such as an operation signal for the disconnecting switch 140, may be generated for disconnecting the unit unit 110 forming the branch line accommodation space in which the partial discharge generation position CP is determined from the bus line (the same applies to S717, which will be described later). . When the process of step S706 ends, the process according to the flowchart of FIG. 7 ends.

If it is determined in step S704 described above that the number of sensors whose detection strength exceeds the threshold is not one (NO in step S704), the number of sensors whose detection strength exceeds the threshold is two or more. In this case, the process of step S707 is executed. In step S707, the sensor determination unit 632 determines whether or not there are sensors 190c to 190f installed in the branch line accommodation spaces 180a to 180d among the sensors whose detection intensity obtained in step S702 exceeds the threshold. In FIG. 7 and the following description, the sensors 190c to 190f installed in the branch line accommodation spaces 180a to 180d are also referred to as load side sensors. The sensors 190a-190b installed in the busbar housing spaces 170a-170b are also called busbar side sensors.

As a result of this determination, if there is no load-side sensor among the sensors whose detection strength exceeds the threshold (YES in step S707), the sensors whose detection strength exceeds the threshold are the sensors 190a installed in the busbar accommodation spaces 170a to 170b or 190b only. In this case, the process of step S712, which will be described later, is executed. On the other hand, if there is a load sensor among the sensors whose detection intensity exceeds the threshold (NO in step S707), the process of step S708 is executed. In step S708, the sensor determination unit 632 determines whether there is a bus-side sensor (sensors 190a to 190b) among the sensors whose detection intensity obtained in step S702 exceeds the threshold.

As a result of this determination, if there is no bus-side sensor among the sensors whose detection strength exceeds the threshold (NO in step S708), the sensors whose detection strength exceeds the threshold are only the load-side sensors. In this case, the process of step S715, which will be described later, is executed. On the other hand, if there is a bus-side sensor among the sensors whose detection intensity exceeds the threshold (YES in step S708), the sensors whose detection intensity exceeds the threshold include the bus-side sensor and the load-side sensor. In this case, the process of step S709 is executed.

In step S709, the waveform data acquisition unit 640 acquires waveform data based on the detected values stored in the storage unit 620 in step S701. In the present embodiment, the waveform data of the load-side sensor having the maximum detection strength among the load-side sensors whose detection strength exceeds the threshold value is acquired. Note that when there is only one load-side sensor whose detection intensity exceeds the threshold, the waveform data acquisition unit 640 acquires the waveform data of the load-side sensor.

Next, in step S710, the frequency spectrum acquisition unit 651 calculates and acquires the frequency spectrum of the waveform data of the load-side sensor acquired in step S709.
Next, in step S711, the frequency spectrum determination unit 652 determines whether or not the distribution of the frequency spectrum of the waveform data of the load-side sensor acquired in step S710 satisfies the frequency distribution condition.

A specific example of the frequency distribution condition is that the ratio of the integrated value of the frequency spectrum in the second frequency band of 400 MHz to 1100 MHz to the integrated value of the frequency spectrum in the first frequency band of 750 MHz to 1100 MHz is 0.4 or more. It is a condition. As described with reference to FIGS. 5A and 5B, when such frequency distribution conditions are satisfied, the generation positions CP of the partial discharges generated inside the gas-insulated switchgear 100 are the busbar accommodation spaces 170a to 170b (see FIG. 5A and FIG. 5B). see frequency spectra 520, 540). On the other hand, if the frequency distribution condition is not satisfied, the partial discharge generation positions CP generated inside the gas insulated switchgear 100 are the branch line accommodation spaces 180a to 180d (see frequency spectra 510 and 530).

As a result of the determination in step S711, if the distribution of the frequency spectrum of the waveform data of the load-side sensor acquired in step S710 does not satisfy the frequency distribution condition (NO in step S711), the process of step S715, which will be described later, is executed. be. On the other hand, as a result of the determination in step S711, if the distribution of the frequency spectrum of the waveform data of the load-side sensor acquired in step S710 satisfies the frequency distribution condition (YES in step S711), the process of step S712 is executed. . As described above, even if it is determined in step S707 that there is no load-side sensor among the sensors whose detection intensity exceeds the threshold value (YES in step S707), the process of step S712 is executed. In step S712, the second intensity acquisition unit 653 acquires the detection intensity of the bus-side sensor determined to exceed the threshold in step S702.

Next, in step S713, based on the detection intensity of the bus-side sensor acquired in step S712, the specifying unit 654 identifies one of the bus-line accommodation spaces in which the bus-side sensor is installed as the partial discharge generation position CP. It is determined as the bus bar accommodation space. When a plurality of detection intensities are obtained in step S712 as the detection intensities of the bus-side sensors determined to exceed the threshold, the specifying unit 654 indicates the maximum detection intensity among the bus-bar accommodation spaces 170a to 170b. The busbar housing space in which the busbar side sensor is installed is determined as the partial discharge generation position CP. On the other hand, when one detection intensity is acquired in step S712 as the detection intensity of the bus-side sensor determined to exceed the threshold, the specifying unit 654 determines the bus-side accommodation space in which the bus-side sensor is installed as It is determined as the partial discharge generation position CP.

Next, in step S714, the output unit 660 generates an operation signal indicating that the bus housed in the bus housing space determined in step S713 is to be disconnected from the electric power system, and the gas insulated switchgear 100 or the gas insulated switchgear is generated. Output to a controller that controls the operation of the device 100 . When the process of step S714 ends, the process according to the flowchart of FIG. 7 ends.

As described above, in step S708, if it is determined that there is no bus-side sensor among the sensors whose detection intensity exceeds the threshold (NO in step S708), and in step S711, the distribution of the frequency spectrum of the waveform data is determined as the frequency distribution. If it is determined that the condition is satisfied (NO in step S711), the process of step S715 is executed. In this case, the generation position CP of the partial discharge generated inside the gas-insulated switchgear 100 is any one of the branch line accommodating spaces 180a to 180d.

In step S715, the second intensity acquisition unit 653 acquires the detection intensity of the load-side sensor determined to exceed the threshold in step S702.
Next, in step S716, based on the detection intensity of the load-side sensor acquired in step S715, the specifying unit 654 selects one of the branch line accommodation spaces in which the load-side sensor is installed as the partial discharge generation position CP. is determined as the branch line accommodation space. When a plurality of detection intensities are obtained in step S715 as the detection intensities of the load-side sensors determined to exceed the threshold, the specifying unit 654 selects the maximum detection intensity among the branch line accommodation spaces 180a to 180d. The branch line accommodating space in which the shown load-side sensor is installed is determined as the partial discharge generation position CP. On the other hand, when one detection strength is acquired in step S712 as the detection strength of the load-side sensor determined to exceed the threshold, the specifying unit 654 selects the branch line accommodation space in which the load-side sensor is installed. , is determined as the partial discharge generation position CP.

Next, in step S717, the output unit 660 generates an operation signal indicating that the load connected to the branch line accommodation space determined in step S716 is disconnected from the power system, and the gas insulated switchgear 100 or gas Output to a control device that controls the operation of the insulated switchgear 100 . When the process of step S717 ends, the process according to the flowchart of FIG. 7 ends. As for steps S706, S714, and S717 described above, when this method is performed manually, the operation signal is generated by a person operating the control device.

<Summary>
As described above, in the present embodiment, the partial discharge position locating device 600 includes the busbar partial spaces 171a to 174a and 171b to 174b in which the busbars 120a to 120b are partially accommodated, and the branch lines 130a to 130b branched from the busbars 120a to 120b. Positions of occurrence of partial discharges generated in a gas insulated switchgear 100 having one or more unit units 110 (110a to 110d) in which branch line accommodation spaces 180a to 180d for accommodating branch wires 130d are located. At this time, the partial discharge position locating device 600 acquires waveform data, which is the detection result of electromagnetic waves generated when partial discharge occurs, by at least one sensor 190 installed in the gas-insulated switchgear 100 . Then, the partial discharge position locating device 600 acquires the frequency spectrum of the acquired waveform data, and based on the presence or absence of bias in the distribution of the acquired frequency spectrum, the space where the partial discharge generation position CP exists is 1 or more. Within the busbar accommodation spaces 170a-170b formed by the busbar partial spaces 171a-174a and 171b-174b of the unit units 110 (110a-110d), or at any branch of one or more unit units 110 (110a-110d) It is determined whether it is within the line accommodation spaces 180a to 180d. A frequency spectrum is obtained for each waveform data of the sensors 190a-190f, and the distribution bias of the frequency spectrum is obtained without performing a comparison for multiple sensors. Therefore, the occurrence position CP of partial discharge can be determined without using an expensive sensor as a sensor for detecting partial discharge, installing a large number of sensors for detecting partial discharge, or imposing a large computational load. It is possible to locate with high accuracy, and the position CP of occurrence of partial discharge can be located at low cost and with high accuracy.

Further, in this embodiment, the sensors 190c to 190f are installed in the branch line accommodating spaces 180a to 180d. Therefore, depending on whether the partial discharge generation positions CP are the bus line accommodating spaces 170a to 170b or the branch line accommodating spaces 180a to 180d, the degree of bias in the frequency spectrum distribution of the waveform data of the sensors 190c to 190f clearly differs ( see frequency spectra 510, 520, 530, 540). Therefore, the partial discharge generation position CP can be determined at low cost and with high accuracy.

Further, in the present embodiment, when electromagnetic waves are detected by two or more sensors 190 based on the presence or absence of bias in the distribution of the frequency spectrum, the partial discharge positioning device 600 detects that each of the two or more sensors 190 Based on the detected intensity of the electromagnetic wave, the partial discharge generation position CP is specified. Therefore, it is possible to determine the partial discharge generation position CP with high accuracy with relatively simple logic.

Further, in the present embodiment, the partial discharge positioning device 600 detects the presence or absence of the occurrence of partial discharge based on the presence or absence of the sensor 190 whose detection intensity of the waveform data exceeds the threshold. Then, acquire the frequency spectrum of the waveform data. Therefore, even if it is not possible to determine which of the bus line accommodating spaces 170a to 170b and the branch line accommodating spaces 180a to 180d the partial discharge occurrence position CP is, only by comparing the detected intensity of the waveform data and the threshold value. Based on the frequency spectrum of the waveform data, it is possible to determine which of the bus line accommodating spaces 170a to 170b and the branch line accommodating spaces 180a to 180d the partial discharge occurrence position CP is.

Further, in the present embodiment, the frequency distribution conditions are the analysis value of the frequency spectrum in the high frequency band on the higher frequency side than the specified frequency and the analysis value of the frequency spectrum in the low frequency band on the lower frequency side than the specified frequency. , and it is determined whether or not the distribution of the frequency spectrum can be considered to be biased. Therefore, it is possible to quantitatively evaluate the bias of the distribution of the frequency spectrum. Further, by using the integrated value as the analysis value, the analysis value can be a value that appropriately and easily reflects the degree of bias in the distribution of the frequency spectrum.

<Modification>
If one sensor 190a to 190f is installed in each of the busbar accommodation spaces 170a to 170b and the branch wire accommodation spaces 180a to 180d as in the present embodiment, the sensors can be installed in just the right amount, which is preferable. However, the number of sensors 190a-190f is not limited. A plurality of sensors may be installed in one busbar accommodation space 170a-170b, or a plurality of sensors may be installed in one branch wire accommodation space 180a-180d. Further, for example, if it is determined whether the partial discharge generation positions CP are the bus line housing spaces 170a to 170b or the branch line housing spaces 180a to 180d, then the partial discharge generation positions CP are the bus line housing spaces 170a to 170b and the branch line housing spaces If it is not necessary to determine which of the line accommodation spaces 180a to 180d, sensors need not be installed in all of the bus line accommodation spaces 170a to 170b and the branch line accommodation spaces 180a to 180d. Further, in the present embodiment, the case of obtaining the waveform data output from all the sensors 190a to 190f has been exemplified. However, it is not always necessary to acquire waveform data output from all sensors 190a-190f. For example, if it is not necessary to determine in which of the busbar accommodation spaces 170a to 170b and the branch wire accommodation spaces 180a to 180d the partial discharge generation position CP is located, It is not necessary to obtain the waveform data output from the sensors 190a and 190b. Also, for example, even when the number of busbar accommodation spaces is one, it is not necessary to acquire the waveform data output from the sensors 190a to 190b installed in the busbar accommodation spaces.

Moreover, in the present embodiment, the frequency distribution condition is a condition indicating that the distribution of the frequency spectrum of the waveform data can be considered to be unbiased. However, if the analysis value of the frequency spectrum in the high frequency band on the higher frequency side than the specified frequency and the analysis value of the frequency spectrum in the low frequency band on the lower frequency side than the specified frequency are compared, the frequency The distribution conditions may not necessarily be the conditions described in this embodiment. For example, the frequency distribution condition may be a condition indicating that the distribution of the frequency spectrum of the waveform data can be regarded as biased. Also, the ratio of the integrated value of the frequency spectrum in the low frequency band on the high frequency side of the specified frequency to the integrated value of the frequency spectrum in the high frequency band on the low frequency side of the specified frequency is a threshold value or more or a threshold value or less. may be set as the frequency distribution condition.

Further, in the present embodiment, the case where the waveform data and the frequency spectrum are acquired when the detection unit 630 detects the occurrence of partial discharge is exemplified. However, this need not necessarily be the case. For example, acquisition of waveform data and acquisition of frequency spectrum may be performed regardless of whether occurrence of partial discharge is detected. In this case, for example, the occurrence of partial discharge may be detected based on waveform data.

Further, as described above, the gas-insulated switchgear is not limited to the gas-insulated switchgear 100 shown in FIGS. 1A to 1C. The fact that there is a difference in the bias of the frequency spectrum distribution of the waveform data depending on whether the position where the partial discharge is generated is the bus line accommodation space or the branch line accommodation space is due to the propagation distance of the electromagnetic wave and the structure existing on the propagation path of the electromagnetic wave. , and the shape of the propagation path of the electromagnetic wave differ depending on the bus line accommodation space and the branch line accommodation space.

Further, in the gas insulated switchgear 100 exemplified in the present embodiment, if the waveform data of the load side sensor is selected and the frequency spectrum is obtained, the partial discharge generation position CP is determined to be either the bus bar accommodation spaces 170a to 170b or the branch line. It is preferable because the degree of bias in the frequency spectrum distribution of the waveform data of the sensors 190c to 190f can clearly differ depending on the housing spaces 180a to 180d. However, for example, even in the frequency spectrum of the waveform data of the bus side sensor, the distribution of the frequency spectrum of the waveform data of the sensor depends on whether the partial discharge generation positions CP are the bus line accommodating spaces 170a to 170b or the branch line accommodating spaces 180a to 180d. When applying the partial discharge position locating device 600 of the present embodiment to a gas insulated switchgear having a structure in which the degree of deviation of the current is clearly different, the waveform data of the bus side sensor is selected and the frequency spectrum is acquired. may

The embodiments of the present invention described above can be implemented by a computer executing a program. A computer-readable recording medium recording the program and a computer program product such as the program can also be applied as embodiments of the present invention. Examples of recording media that can be used include flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, magnetic tapes, nonvolatile memory cards, and ROMs. Further, the embodiments of the present invention may be realized by a PLC (Programmable Logic Controller), or may be realized by dedicated hardware such as an ASIC (Application Specific Integrated Circuit).
In addition, the embodiments of the present invention described above are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be construed to be limited by these. It is. That is, the present invention can be embodied in various forms without departing from its technical concept or main features.

1 Partial discharge positioning system 100 Gas insulated switchgear (GIS)
110 (110a to 110d) Unit 120a to 120b Busbar 130a to 130d Branch line 140a to 140d Disconnecting switch 150a to 150d Circuit breaker 160a to 160d Cable head 170a to 170b Busbar accommodation space 171a to 174a Busbar partial space 171b to 174b Busbar Partial space 180a to 180d Branch line accommodation space 190 (190a to 190f) Sensor 210 Insulating spacer 310 Approximate curve of relationship between detection intensity and propagation distance 410 Pulse generator 420 Oscilloscope 430 PC for analysis
510 to 540 frequency spectrum 600 partial discharge positioning device 610 detection value acquisition unit 620 storage unit 630 detection unit 631 first intensity acquisition unit 632 sensor determination unit 640 waveform data acquisition unit 650 orientation unit 651 frequency spectrum acquisition unit 652 frequency spectrum determination unit 653 Second intensity acquisition unit 564 Identification unit 660 Output unit CP Partial discharge generation position

Claims (8)

Partial discharge generated in a gas insulated switchgear having one or more unit units in which a busbar partial space for partially accommodating a busbar and a branch wire accommodating space for accommodating a branch wire branched from the busbar are formed. A partial discharge position locating device for locating the position of occurrence,
a waveform data acquisition unit that acquires waveform data that is a detection result of electromagnetic waves generated when the partial discharge occurs by at least one sensor installed in the gas insulated switchgear;
a locating unit that locates the occurrence position of the partial discharge based on the waveform data,
The orientation unit is
a frequency spectrum acquisition unit that acquires a frequency spectrum of the waveform data;
Based on the presence or absence of bias in the distribution of the frequency spectrum, the space in which the position where the partial discharge occurs is within the bus bar accommodation space formed by the bus bar partial spaces of the one or more unit units, or the one a frequency spectrum determination unit that determines whether any of the above unit units is within the branch line accommodation space;
A partial discharge locating device comprising: 2. The partial discharge position locating device according to claim 1, wherein said at least one sensor is a load side sensor installed in said branch line accommodation space. The gas insulated switchgear is provided with a plurality of the sensors,
The orientation unit is
an intensity acquisition unit that acquires the detection intensity of the electromagnetic wave detected by the sensor;
When the electromagnetic wave is detected by two or more sensors installed in the space determined by the frequency spectrum determination unit, based on the detection strength of the electromagnetic wave detected by each of the two or more sensors, 3. The partial discharge position locating device according to claim 2, further comprising a specifying unit that specifies a position where the partial discharge is generated in the space. Further comprising a detection unit that detects the presence or absence of the occurrence of the partial discharge based on the presence or absence of the sensor whose detection intensity of the electromagnetic wave exceeds a threshold value for determining the occurrence of the electromagnetic wave,
The frequency spectrum acquisition unit is
The partial discharge according to any one of claims 1 to 3, wherein the frequency spectrum of the waveform data acquired by the waveform data acquisition unit is acquired when the generation of the partial discharge is detected by the detection unit. Positioning device. The frequency spectrum determination unit,
Based on the result of comparison between the analysis value of the frequency spectrum in a high frequency band on the higher frequency side than the prescribed frequency and the analysis value of the frequency spectrum in a low frequency band on the lower frequency side than the prescribed frequency 4. The partial discharge position locating device according to claim 1, wherein it is determined whether or not the frequency spectrum distribution can be regarded as biased. 6. The partial discharge localization device according to claim 5, wherein said analysis value is an integral value. Partial discharge generated in a gas insulated switchgear having one or more unit units in which a busbar partial space for partially accommodating a busbar and a branch wire accommodating space for accommodating a branch wire branched from the busbar are formed. A partial discharge localization method for locating the generation position,
a waveform data acquisition step of acquiring waveform data as a detection result of electromagnetic waves generated when the partial discharge occurs by at least one sensor installed in the gas insulated switchgear;
a locating step of locating the position of occurrence of the partial discharge based on the waveform data;
The orientation step includes
a frequency spectrum acquisition step of acquiring a frequency spectrum of the waveform data;
Based on the presence or absence of bias in the distribution of the frequency spectrum, the space in which the position where the partial discharge occurs is within the bus bar accommodation space formed by the bus bar partial spaces of the one or more unit units, or the one a frequency spectrum determination step of determining whether any of the above unit units is within the branch line accommodation space;
A partial discharge localization method comprising: A program for causing a computer to function as each part of the partial discharge positioning device according to any one of claims 1 to 6.

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