JP2015158455A - Damage detector, damage detection system, and damage detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a damage of a part of elements constituting a gas insulation arrester.SOLUTION: A damage detection unit receives sensor data showing a detected physical quantity from a sensor for detecting the physical quantity corresponding to the temperature of the gas in a tank of a gas insulation arrester. The damage detection unit detects a damage of a part of elements on the basis of the received sensor data. In more detail, the damage detection unit determines that a part of the elements is damaged when the physical quantity is increased by a thunderstroke and when it is detected that the behavior of the increase depends on the tank, gas, and a thermal time constant of the structure in the tank.

Description

  The present invention relates to a technique for detecting breakage of some elements constituting a gas insulated lightning arrester.

  Patent Documents 1, 2, 3 and Non-Patent Document 1 disclose a fault location system in a gas insulated switchgear (GIS) installed in a substation or the like. When a ground fault occurs inside the GIS, the gas around the accident point is rapidly heated and expanded by the instantaneous arc energy determined by the arc current of the ground fault arc and the arc duration. Such a rapid expansion of the gas propagates in the accident tank as a steep pressure wave. Then, an abrupt and shocking increase in gas pressure due to such a steep pressure wave is detected by using a gas pressure sensor. As reported in Patent Document 2 and Non-Patent Document 1, a sudden increase in gas pressure at the time of a ground fault is a transient phenomenon of about several tens of seconds.

JP-A-6-201752 Japanese Patent Laid-Open No. 7-055871 JP-A-9-229990

Ota et al., “Verification of 154kVGIS fault location sensor”, IEEJ Power and Energy Division Conference, Proceedings, pages 127-128

One component of the GIS is a “gas-insulated lightning arrester” installed to protect equipment in the GIS from lightning strikes. The gas-insulated lightning arrester includes a tank filled with an insulating gas such as SF ₆ and a lightning arrester (LA: Lightning Arrester) housed in the tank. In order to ensure a high withstand voltage, the LA is generally configured by connecting a plurality of elements in series.

  Here, the inventor of the present application paid attention to the following points for the first time. That is, only some of the plurality of elements constituting the LA may be damaged by lightning strikes.

  Depending on the lightning energy level and waveform, only some of the elements may be damaged, and the remaining elements may remain healthy. In this case, since all the road destruction of LA does not occur, it does not develop into a ground fault, and a shocking gas pressure increase caused by a ground fault arc does not occur. In other words, the event that some of the elements are damaged is an unexpected event in the case of a conventional fault location system for a ground fault.

  However, the failure of some elements may induce the damage of another element or the entire destruction of the LA at the next lightning strike. In particular, when all the roads break down, large damage occurs due to a ground fault. In order to prevent the occurrence of such a major accident, it is desired to detect the breakage of some elements.

  One object of the present invention is to provide a technique capable of detecting breakage of some elements constituting a gas-insulated lightning arrester.

  In one aspect of the present invention, there is provided a breakage detection device that detects breakage of some elements constituting a gas-insulated lightning arrester. The breakage detection unit of the breakage detection device receives sensor data indicating the detected physical quantity from a sensor that detects a physical quantity corresponding to the temperature of the gas in the tank of the gas insulated lightning arrester. The damage detection unit detects damage of some elements based on the received sensor data. More specifically, when the damage detection unit detects that the physical quantity increases due to lightning strikes and that the increase behavior depends on the thermal time constant of the tank, the gas, and the structure in the tank, It is determined that the element has been damaged.

  In another aspect of the present invention, a breakage detection method for detecting breakage of a part of elements constituting a gas insulated lightning arrester is provided. The damage detection method includes (A) a step of detecting a physical quantity corresponding to the temperature of the gas in the tank of the gas-insulated lightning arrester, and (B) a step of detecting breakage of some elements based on the detected physical quantity. And including. The step (B) of detecting the failure of some elements detects that the physical quantity increases due to lightning strikes, and that the increase behavior depends on the thermal time constant of the tank, the gas, and the structure in the tank. A step of determining that some elements have been damaged.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to detect the failure | damage of a one part element which comprises a gas insulated lightning arrester.

FIG. 1 is a schematic diagram showing the configuration of a gas-insulated lightning arrester. FIG. 2 is a schematic view showing a case where some elements of the gas insulated lightning arrester are damaged. FIG. 3 is a graph showing the behavior of an increase in gas pressure when the element is broken. FIG. 4 is a block diagram schematically showing a configuration example of the damage detection system according to Embodiment 1 of the present invention. FIG. 5 is a block diagram schematically showing a configuration example of a damage detection system according to Embodiment 2 of the present invention. FIG. 6 is a conceptual diagram for explaining a partial element breakage detection method according to Embodiment 2 of the present invention. FIG. 7 is a block diagram illustrating a configuration example of a breakage detection unit of the breakage detection apparatus according to Embodiment 2 of the present invention. FIG. 8 is a conceptual diagram for explaining a partial element breakage detection method according to Embodiment 3 of the present invention. FIG. 9 is a block diagram illustrating a configuration example of a breakage detection unit of the breakage detection apparatus according to Embodiment 3 of the present invention. FIG. 10 is a conceptual diagram for explaining a partial element breakage detection method according to Embodiment 4 of the present invention. FIG. 11 is a block diagram illustrating a configuration example of a breakage detection unit of the breakage detection apparatus according to Embodiment 4 of the present invention. FIG. 12 is a block diagram showing a configuration example of a breakage detection unit of the breakage detection apparatus according to Embodiment 5 of the present invention. FIG. 13 is a block diagram schematically showing a configuration example of a damage detection system according to Embodiment 6 of the present invention. FIG. 14 is a block diagram schematically showing a configuration example of a damage detection system according to Embodiment 8 of the present invention. FIG. 15 is a flowchart showing an operation example of the damage detection system according to the eighth embodiment of the present invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiment 1 FIG.
<Gas insulated lightning arrester>
FIG. 1 schematically shows the configuration of a gas-insulated lightning arrester 10 installed in a substation or the like. The gas insulated lightning arrester 10 includes an LA tank 11 and a lightning arrester (LA) 13. The LA tank 11 is a sealed metal container, and an insulating gas 12 such as SF ₆ is sealed therein. The LA 13 is accommodated in the LA tank 11. One end of the LA 13 is connected to the high-voltage conductor 1, and the other end is connected to the ground via the ground wire 2.

  As shown in FIG. 1, the LA 13 is configured by stacking a plurality of elements 13-1 to 13-k (k is an integer of 2 or more). In other words, the plurality of elements 13-1 to 13-k are connected in series between the high-voltage conductor 1 and the ground wire 2. Each element is, for example, a zinc oxide element. By using a plurality of elements 13-1 to 13-k connected in series in this way, a high withstand voltage is ensured.

<Phenomenon when some elements are damaged>
Consider a case where a lightning surge exceeding the withstand capability of LA 13 enters such a gas-insulated lightning arrester 10. At this time, depending on the lightning energy level and waveform, only a part of the plurality of elements 13-1 to 13-k constituting the LA 13 may be damaged, and the remaining elements may remain healthy. For example, FIG. 2 shows a state in which only the element 13-3 is damaged. Such a state may be referred to as “partially damaged element” hereinafter.

  In the case of partial element failure, since all-path destruction does not occur, it does not develop into a ground fault, and a shocking gas pressure increase due to a ground fault arc does not occur. However, the inventor of the present application discovered for the first time another phenomenon caused by partial element damage. With reference to FIG. 3, the phenomenon at the time of partial element failure is demonstrated.

In FIG. 3, the horizontal axis represents time, and the vertical axis represents an increase in gas pressure after a lightning stroke. Here, the “gas pressure” means the pressure of the gas 12 inside the LA tank 11 and is measured by a gas pressure sensor installed in the LA tank 11. “P ₀ ” in FIG. 3 represents the gas pressure before the lightning strike. As shown in FIG. 3, when a part of the element is broken, the gas pressure slowly rises and the state in which the gas pressure is increased continues for several tens of minutes (typically 10 to 60 minutes).

  As a comparison, the behavior of gas pressure during a ground fault is also shown. Note that the values on the vertical axis are normalized in order to compare temporal behavior. As described above, in the event of a ground fault, a sudden pressure wave is generated due to rapid heating and rapid expansion of the gas by instantaneous arc energy, and a sudden and shocking increase in gas pressure due to the pressure wave is detected. The sudden increase in gas pressure at the time of a ground fault is a transient phenomenon of several tens of seconds.

  On the other hand, it can be seen that the increase in gas pressure when a part of the element is broken is very slow and continuous. The behavior of the gas pressure when such a partial element is broken is explained as follows.

  When a part of the element is damaged, LA 13 absorbs lightning surge energy and generates heat. That is, the temperature of LA13 rises. The temperature rise of LA 13 diffuses into LA tank 11 according to the thermal diffusion equation. As a result, the temperature of the gas 12 in the LA tank 11 rises slowly, and accordingly, the gas pressure also rises slowly. That is, the increase in gas pressure when a part of the element is broken is not due to the propagation of pressure waves, but due to the diffusion of heat. Therefore, the behavior of the gas pressure increase when a part of the element is broken depends on the “thermal time constant” of the LA tank 11, the gas 12, and the structure (LA13, etc.) in the LA tank 11, and its time scale. Is typically about 10-60 minutes. Note that when the lightning surge energy is so small that no element damage occurs, the heat generation is small and the gas temperature rise is limited, so that the remarkable gas pressure rise behavior as shown in FIG. 3 is not observed.

  Actually, cooling of the LA tank 11 by outside air also affects the gas pressure. Therefore, as shown in FIG. 3, the gas pressure rises slowly, then reaches an equilibrium state, and then decreases more slowly. However, the rise time of the gas pressure increase depends on the thermal time constant described above, and it remains the same as in the case of a ground fault. Further, the state in which the gas pressure is increased continues for a long period (including the rise time) depending on the thermal time constant, and it is completely different from the case of the ground fault.

  The present invention is based on the above findings obtained for the first time by the present inventor.

<Damage detection system>
FIG. 4 is a block diagram schematically showing a configuration example of the damage detection system according to Embodiment 1 of the present invention. The damage detection system includes a gas insulated lightning arrester 10, a sensor 20, and a damage detection device 30.

  The sensor 20 detects a physical quantity corresponding to the temperature of the gas 12 in the LA tank 11 of the gas insulated lightning arrester 10. The physical quantity corresponding to the temperature of the gas 12 may be the temperature of the gas 12 or the pressure of the gas 12. That is, the sensor 20 may be a gas temperature sensor or a gas pressure sensor. The sensor 20 outputs sensor data SEN indicating the detected physical quantity.

  The damage detection device 30 is a device for detecting damage to some elements of the gas-insulated lightning arrester 10. The damage detection device 30 is connected to the sensor 20 and receives sensor data SEN from the sensor 20. Then, the damage detection device 30 detects a partial element damage based on the received sensor data SEN. Part of the damage detection device 30 may be configured by a microcomputer or a personal computer.

  The breakage detection device 30 includes a breakage detection unit 40 as a functional block that detects breakage of some elements. The damage detection unit 40 receives the sensor data SEN output from the sensor 20, and detects partial element damage based on the received sensor data SEN. Note that at least a part of the damage detection unit 40 may be realized by software (program) executed by a microcomputer or a personal computer.

  More specifically, when the damage detection unit 40 detects that the physical quantity increases due to lightning strike and that the increase behavior is slow as shown in FIG. Is determined to have occurred. That is, when the damage detection unit 40 detects that the increase behavior depends on the “thermal time constant” of the LA tank 11, the gas 12, and the structure (LA13, etc.) in the LA tank 11, It is determined that damage has occurred.

  When a partial element breakage is detected, the breakage detection unit 40 may sound an alarm.

<Effect>
As described above, according to the present embodiment, it is possible to detect partial damage of the gas-insulated lightning arrester 10. The partial element breakage is an unexpected event from the conventional fault location system for ground faults, and this embodiment is extremely useful.

  In addition, a partial element breakage may induce another element breakage or LA all-path destruction at the next lightning strike. In particular, when all the roads break down, large damage occurs due to a ground fault. If it is possible to detect a partial damage according to this embodiment, it is possible to prevent such a major accident from occurring. This is also preferable from the viewpoint of cost.

Embodiment 2. FIG.
FIG. 5 is a block diagram schematically showing a configuration example of a damage detection system according to Embodiment 2 of the present invention. In the present embodiment, the sensor 20 is a pressure sensor 20A. The pressure sensor 20A detects the pressure of the gas 12 in the LA tank 11 of the gas insulated lightning arrester 10, and outputs sensor data SEN indicating the detected gas pressure.

  The damage detection unit 40 detects partial element damage based on the gas pressure indicated by the sensor data SEN. In the present embodiment, the damage detection unit 40 determines that some element damage has occurred when the “rising” of the gas pressure increase due to lightning strike is slow as shown in FIG. That is, when the damage detection unit 40 detects that the rise time of the gas pressure increase due to the lightning strike depends on the “thermal time constant” of the LA tank 11, the gas 12, and the structure (LA13, etc.) in the LA tank 11. It is determined that a part of the element is broken.

FIG. 6 is a conceptual diagram for explaining an example of a method for detecting “slow rising” of gas pressure increase. If some elements corruption occurs, the gas pressure from the reference pressure P ₀ before lightning strike is slowly increased as indicated by the curve C1. In order to detect this slow rise, the breakage detector 40 calculates and monitors the increments ΔP ₁ , ΔP ₂ , ΔP ₃ ... Of the gas pressure every certain period Δt. More specifically, the damage detection unit 40 compares each of the calculated increments ΔP ₁ , ΔP ₂ , ΔP ₃ ... With a predetermined threshold ΔPt (first threshold), and the increment is equal to or greater than the threshold ΔPt. Count the number of times

  Assume that the final count value is n1 as a result of such counting. This means that the rise of the gas pressure increase continued for at least a period of “n1 × Δt”. Therefore, by setting an appropriate threshold value nt (second threshold value) corresponding to the thermal time constant for the final count value, whether or not the rising of the gas pressure increases slowly according to the thermal time constant. Can be determined. That is, when the count value n1 is equal to or greater than the threshold value nt, the damage detection unit 40 can determine that some element damage has occurred.

  In the case of a ground fault, since the gas pressure increase is instantaneous, the count value does not exceed the threshold value nt. Further, when no element breakage occurs due to lightning strike, since the rise in element temperature (gas pressure) is small, the count value never exceeds the threshold value nt.

  FIG. 7 is a block diagram showing an example of the configuration of the damage detection unit 40 for realizing the method shown in FIG. The damage detection unit 40 includes a sampling unit 50 and a determination unit 60.

  The sampling unit 50 receives the sensor data SEN output from the sensor 20. The sampling unit 50 samples the sensor data SEN every predetermined sampling period Δt. That is, the sampling unit 50 performs A / D conversion. The sampling unit 50 outputs the sampling data DAT obtained by sampling to the determination unit 60.

The determination unit 60 includes a memory 61, a comparator 62, a counter 63, and a comparator 64. In the memory 61, the sampling data DAT obtained by the sampling unit 50 is sequentially stored. The comparator 62 calculates a difference (ΔP ₁ , ΔP ₂ , ΔP ₃ ...) Between two points of sampling data DAT that are temporally continuous, and compares the difference with a threshold value ΔPt (first threshold value). . The counter 63 counts the number of times the difference is equal to or greater than the threshold value ΔPt based on the comparison result by the comparator 62, and outputs a count value CNT indicating the count result. The comparator 64 compares the count value CNT with the threshold value nt (second threshold value), and outputs a detection result signal DST indicating the result of the comparison.

  For example, when the count value CNT is less than the threshold value nt, the detection result signal DST is at the low level, and when the count value CNT is greater than or equal to the threshold value nt, the detection result signal DST is at the high level. The detection result signal DST = High means detection of partial element damage. In response to the detection result signal DST = High, the damage detection unit 40 may sound an alarm.

  As described above, according to the present embodiment, it is possible to detect partial element damage of the gas-insulated lightning arrester 10 with a simple circuit configuration.

Embodiment 3 FIG.
Even if the same phenomenon of partial damage occurs, the degree of the damage can be different each time. Specifically, the greater the lightning surge energy that enters LA 13, the greater the number of elements that are damaged, and the greater the increase in gas pressure.

FIG. 8 shows the behavior of an increase in gas pressure when the lightning surge energy is larger than that shown in FIG. Gas pressure from the reference pressure P _0, is slowly increased as indicated by curve C2. However, the curve C2 has a longer rising period and a higher arrival point than the curve C1 shown in FIG. As a result, the final count value CNT becomes n2 larger than n1 in the case of FIG. That is, the magnitude of lightning surge energy is directly reflected in the count value CNT.

  In other words, it is possible to estimate the lightning surge energy that partially caused the element damage from the count value CNT. Based on this knowledge, according to the present embodiment, the damage detection unit 40 estimates the lightning surge energy that partially caused the element damage based on the count value CNT. This is equivalent to estimating the degree of breakage of LA13.

  FIG. 9 is a block diagram showing an example of the configuration of the damage detection unit 40 in the present embodiment. A description overlapping with the case of the above-described second embodiment will be omitted as appropriate. As shown in FIG. 9, the damage detection unit 40 in the present embodiment further includes an analysis unit 70 in addition to the above configuration. The analysis unit 70 includes a database 71 indicating a correspondence relationship between the count value CNT and the lightning surge energy.

  The analysis unit 70 receives the count value CNT and the detection result signal DST from the determination unit 60 described above. When the detection result signal DST indicates the detection of partial element breakage, the analysis unit 70 refers to the count value CNT and the database 71 to estimate the energy of lightning surge that has caused the partial element breakage. That is, the analysis unit 70 estimates the degree of LA13 damage. The analysis unit 70 can be realized by, for example, a microcomputer or a personal computer.

  According to the present embodiment, it is possible to estimate the energy of lightning surge that has partially caused damage to the element, and thus the degree of damage to LA13.

Embodiment 4 FIG.
In the fourth embodiment, another example of a specific method for detecting a partial element breakage is proposed. In the present embodiment, attention is paid to the “long duration” of the gas pressure increase including the rise time as shown in FIG. That is, the damage detection unit 40 determines that some element damage has occurred when it is detected that the state in which the gas pressure has increased due to the lightning strike has continued for a period depending on the thermal time constant. The duration of the increased gas pressure is typically 10 minutes or more.

FIG. 10 is a conceptual diagram for explaining an example of a method for detecting “long duration” of gas pressure increase. If some elements corruption occurs, the gas pressure slowly rises from the reference pressure P ₀ before lightning. The damage detection unit 40 measures a duration during which the increase in gas pressure after a lightning strike exceeds a predetermined threshold value Pt (third threshold value). And when the continuation period becomes more than predetermined threshold value Dt (4th threshold value), the failure detection part 40 determines with a partial element failure having generate | occur | produced. The threshold value Dt is set to 10 minutes, for example.

  In the case of a ground fault, since the increase in gas pressure is instantaneous, the duration does not exceed the threshold value Dt. Further, when no element damage occurs due to lightning strike, the increase in the element temperature (gas pressure) is small, so that the increase in gas pressure does not exceed the threshold value Pt.

  FIG. 11 is a block diagram showing an example of the configuration of the damage detection unit 40 for realizing the method shown in FIG. The damage detection unit 40 includes a sampling unit 50 and a determination unit 60. The sampling unit 50 is the same as that in the second embodiment, and the description thereof is omitted.

  The determination unit 60 includes a comparator 65, a timer 66, and a comparator 67. The comparator 65 compares the sampling data DAT with a predetermined threshold value Pt (third threshold value). The timer 66 measures the duration during which the sampling data DAT exceeds the threshold value Pt based on the comparison result by the comparator 65. The comparator 67 compares the continuation period with a predetermined threshold value Dt (fourth threshold value), and outputs a detection result signal DST indicating the result of the comparison.

  For example, when the duration is less than the threshold Dt, the detection result signal DST is at the low level, and when the duration is equal to or greater than the threshold Dt, the detection result signal DST is at the high level. The detection result signal DST = High means detection of partial element damage. In response to the detection result signal DST = High, the damage detection unit 40 may sound an alarm.

  As described above, according to the present embodiment, it is possible to detect partial element damage of the gas-insulated lightning arrester 10 with a simple circuit configuration.

  It is possible to use the method of the present embodiment together with the methods of the second and third embodiments. In that case, the detection accuracy of partial element breakage is further improved, which is preferable.

Embodiment 5 FIG.
The temperature of the LA tank 11 varies according to the outside air temperature. The temperature change of the LA tank 11 also affects the temperature of the gas 12 in the LA tank 11, that is, the gas pressure. In particular, since the time scale of the gas pressure increase phenomenon in the case of partial element failure is much longer than that at the time of a ground fault, it is preferable to take into account fluctuations in the outside temperature.

  FIG. 12 shows a configuration example of the damage detection unit 40 according to the present embodiment. According to the present embodiment, the damage detection unit 40 further includes a correction unit 80 in addition to the sampling unit 50 and the determination unit 60. The configurations of the sampling unit 50 and the determination unit 60 are the same as those in the above-described embodiment, and a detailed description thereof will be omitted.

  The correction unit 80 receives outside air temperature data TE indicating the measured outside air temperature from the outside air temperature sensor 21 that measures the outside air temperature. Then, the correction unit 80 corrects the sampling data DAT output from the sampling unit 50 according to the outside air temperature indicated by the outside air temperature data TE. That is, the correction unit 80 corrects the sampling data DAT of the gas pressure so as to cancel the change in the gas pressure due to the change in the outside air temperature. The correction unit 80 outputs correction data DAT ′ obtained as a result of the correction process to the determination unit 60. The determination unit 60 detects partial element damage by using the correction data DAT ′ instead of the sampling data DAT.

  As described above, according to the present embodiment, the gas pressure is appropriately corrected so as to cancel the change in the gas pressure due to the change in the outside air temperature. Therefore, the probability of misjudgment is reduced, and the detection accuracy of partial element damage is further improved. Note that this embodiment can be applied to any of the above-described embodiments.

Embodiment 6 FIG.
The sensor 20 is not limited to the pressure sensor 20A. As shown in FIG. 13, the sensor 20 may be a temperature sensor 20 </ b> B installed in the LA tank 11 of the gas insulated lightning arrester 10. The temperature sensor 20B directly detects the temperature of the gas 12 in the LA tank 11 and outputs sensor data SEN indicating the detected gas temperature. Even with such a configuration, it is possible to realize the same processing and effects as the above-described embodiment.

Embodiment 7 FIG.
In the gas insulated switchgear (GIS), a circuit breaker is installed in addition to the gas insulated lightning arrester 10 in order to protect equipment from lightning surge. At the moment when a current transformer (CT) detects a lightning surge, a protection signal is issued and the breaker trips. The breakage detection device 30 may be activated using a protection signal for tripping the circuit breaker as a trigger. That is, the breakage detection device 30 may be configured to be activated in response to the input of the protection signal. As a result, unnecessary operation of the damage detection device 30 can be prevented, and the reliability of the system can be improved.

Embodiment 8 FIG.
When the damage detection device 30 detects that a part of the element is damaged, the gas-insulated lightning arrester 10 is disassembled, and the damaged part inside the LA tank 11 is repaired. However, since such a dismantling repair is a work accompanied by a power failure, it is preferable that there is more confirmation that damage has surely occurred. Therefore, in the present embodiment, an “auxiliary detection device” that detects a phenomenon other than the increase in gas pressure is used together with the damage detection device 30.

  FIG. 14 is a block diagram schematically showing a configuration example of the damage detection system according to the present embodiment. The damage detection system according to the present embodiment includes a cracked gas detection device 100 and a leakage current detection device 110 as auxiliary detection devices in addition to the damage detection device 30.

When a part of the element is broken, the gas 12 (SF ₆ ) in the LA tank 11 is decomposed by the energy at the time of the breakage. In other words, the generation of the decomposition gas is a coexistence phenomenon that can be observed with some element damage. The cracked gas detection device 100 detects the generation of such cracked gas using a cracked gas sensor 101 installed in the LA tank 11.

  Further, when a part of the element is broken, the leakage current ileak from the LA 13 to the ground line 2 increases. That is, the increase in the leakage current ileak is a coexistence phenomenon that can be observed with some element damage. The leakage current detection device 110 detects such a leakage current ileak using the current sensor 111.

  In the present embodiment, the detection result signal DST output from the damage detection device 30 is input to the cracked gas detection device 100 and the leakage current detection device 110. Then, when the detection result signal DST is switched from Low to High, that is, detection of partial element breakage, the cracked gas detection device 100 and the leakage current detection device 110 are activated.

  FIG. 15 is a flowchart showing an operation example of the damage detection system according to the present embodiment.

  First, the damage detection device 30 detects a partial element damage (step S1). If partial element damage is not detected (step S1; No), the GIS continues to operate. On the other hand, when a partial element breakage is detected by the breakage detection device 30 (step S1; Yes), the cracked gas detection device 100 and the leakage current detection device 110 are activated in response to the detection result signal DST.

  When the cracked gas detection device 100 detects cracked gas and the leakage current detection device 110 detects an increase in leakage current, that is, when the auxiliary detection device detects an abnormality (step S2; Yes), some elements The occurrence of breakage is considered certain. Therefore, it shifts to dismantling repair. In other cases (step S2; No), the GIS continues to operate.

  Thus, according to the present embodiment, the auxiliary detection device is used together with the breakage detection device 30. As a result, it is possible to increase the confirmation of partial element damage. As a result, unnecessary dismantling repairs and power outages can be avoided. That is, the reliability of the damage detection system is improved.

  In addition, any one of the cracked gas detection device 100 and the leakage current detection device 110 may be used as the auxiliary detection device. If only one is used, it is advantageous in terms of cost. When both are used, it is advantageous in terms of reliability.

  It should be noted that the above-described embodiments can be combined within a consistent range.

  The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed by those skilled in the art without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 High voltage conductor, 2 Ground line, 10 Gas insulation lightning arrester, 11 LA tank, 12 Gas, 13 LA, 13-1 to 13-k element, 20 sensor, 21 Outside air temperature sensor, 20A Pressure sensor, 20B Temperature sensor, 30 Breakage Detection device, 40 Damage detection unit, 50 Sampling unit, 60 Judgment unit, 61 Memory, 62 Comparator, 63 Counter, 64 Comparator, 65 Comparator, 66 Timer, 67 Comparator, 70 Analysis unit, 71 Database, 80 Correction unit, 100 cracked gas detection device, 101 cracked gas sensor, 110 leakage current detection device, 111 current sensor, CNT count value, DAT sampling data, DAT 'correction data, DST detection result signal, SEN sensor data, TE ambient temperature data.

Claims (12)

A breakage detection device for detecting breakage of some elements constituting a gas insulated lightning arrester,
Damage detection that receives sensor data indicating the detected physical quantity from a sensor that detects a physical quantity corresponding to the temperature of the gas in the tank of the gas insulated lightning arrester, and detects breakage of the part of the elements based on the sensor data Part
When the physical quantity increases due to lightning strike and the increase behavior depends on a thermal time constant of the tank, the gas, and a structure in the tank, the damage detection unit detects the part of the physical quantity. Damage detection device that determines that element damage has occurred. The damage detection unit according to claim 1, wherein the damage detection unit determines that the part of the element has been damaged when detecting that the rise time of the increase in the physical quantity due to a lightning stroke depends on the thermal time constant. apparatus. The damage detection unit monitors an increase in the physical quantity for each fixed period, counts the number of times the increase is equal to or greater than a first threshold, and if the number exceeds the second threshold, The damage detection apparatus according to claim 1, wherein it is determined that element damage has occurred. The damage detection device according to claim 3, wherein the damage detection unit estimates lightning surge energy that causes damage to the part of the elements based on the number of times. The said damage detection part determines with the said one part element having generate | occur | produced, when it detects that the state which the said physical quantity increased by the lightning strike continued over the period depending on the said thermal time constant. Damage detection device. The damage detection apparatus according to claim 5, wherein the period is 10 minutes or more. The damage detection unit measures a duration in which the increase in the physical quantity after a lightning strike exceeds a third threshold, and when the duration exceeds a fourth threshold, the part of the element is damaged. The damage detection device according to claim 1. The said damage detection part correct | amends the said physical quantity according to outside air temperature, and determines whether the damage of the said some element generate | occur | produced based on the said physical quantity after correction | amendment. The damage detection device according to claim 1. The breakage detection device according to any one of claims 1 to 8, wherein the sensor is a pressure sensor that detects a pressure of the gas in the tank. The damage detection apparatus according to any one of claims 1 to 8, wherein the sensor is a temperature sensor that detects a temperature of the gas in the tank. The breakage detection device according to any one of claims 1 to 10,
An auxiliary detection device that detects at least one of a cracked gas generated by the decomposition of the gas in the tank and a leakage current from the gas-insulated lightning arrester;
A breakage detection system in which the auxiliary detection device is activated by using the breakage detection device as a trigger to detect breakage of the part of elements. A damage detection method for detecting damage to some elements constituting a gas insulated lightning arrester,
Detecting a physical quantity corresponding to the temperature of the gas in the tank of the gas insulated lightning arrester;
Detecting breakage of the part of the elements based on the detected physical quantity,
The step of detecting the breakage of the part of the elements detects that the physical quantity is increased by a lightning stroke, and the increase behavior depends on a thermal time constant of the tank, the gas, and a structure in the tank. A damage detection method including a step of determining that damage has occurred in some of the elements.

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