JP2008067538A - Method for detecting abnormality in gas insulated power apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect internal abnormality with high sensitivity, and moreover, to detect discharge at a spacer, while distinguishing from other abnormalities. <P>SOLUTION: In the method for detecting abnormality of a gas insulated power device, where a conductor 3 is contained in a grounded tank 2 filled with insulating gas 1, while being electrically insulated by a spacer 8, and the decomposition gas of the insulating gas 1 generated in the grounded tank 2 is removed, while being adsorbed by an adsorbent 4; the adsorbent 4 is contained in an enclosed container 5 independently of the grounded tank 2, and the enclosed container 5 is connected to the grounded tank 2 to interconnect the inside of the enclosed container 5 and the grounded tank 2 so that the decomposed gas is introduced into the enclosed container 5 and is adsorbed by the adsorbent 4 for removal. When abnormality detection is performed, a gas that has not yet contacted the adsorbent 4 is sampled from a sampling port 13 provided in the interconnection passage 9 from the grounded tank 2 to the adsorbent 4, and discharge at the spacer is detected, based on the detection of the decomposed gas containing C. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a gas insulated power device using, for example, SF ₆ gas or a mixed gas containing SF ₆ gas as a main insulating medium or arc extinguishing medium, for example, a gas insulated switchgear (GIS), a gas circuit breaker (GCB) ), A cubicle type gas switchgear (C-GIS), a gas insulation transformer, a pipeline gas-insulated power transmission line (GIL) and the like.

  Since gas-insulated power equipment uses an insulating gas above atmospheric pressure as an insulating medium, a high-voltage central conductor (main circuit) that becomes an electric circuit is used together with a solid support insulator (spacer) and a metal ground tank (equipment jacket) It is housed inside and has a sealed structure. Therefore, it has various advantages such as being unaffected by the external environment, being able to reduce the size of the device, and being safe in terms of maintenance, and is extremely frequently used in Japan. On the other hand, there is a problem that it is difficult to monitor the internal state from the outside of the device, and even if an abnormality occurs in the conduction of the main circuit or the device insulation, it is difficult to detect the abnormality. Therefore, there is a strong demand for the development of technology for detecting the internal state of equipment, particularly the insulation performance from the outside.

  For example, when a corona discharge occurs in a gas insulated switchgear, an electromagnetic wave is radiated. Therefore, there is an insulation abnormality detection device that detects the corona discharge by receiving this electromagnetic wave (Japanese Patent Laid-Open No. 01-235865). In this insulation abnormality detection device, the antenna for detecting the corona discharge is disposed at a position where the reception sensitivity is high with respect to the electromagnetic wave generated by the corona discharge, and the noise detection antenna is disposed at a position where the reception sensitivity is sufficiently low with respect to the electromagnetic wave generated by the corona discharge. , And taking the difference between the signal received by the corona discharge detection antenna and the signal received by the noise detection antenna, only the corona discharge signal is extracted to detect an abnormality.

  There is also a partial discharge detection device that detects sound caused by an abnormality (Japanese Patent Laid-Open No. 5-45402). In this partial discharge detection device, an AE (acoustic emission) sensor is attached to a sealed container that houses electrical equipment, and the output of the AE sensor is input to a band-pass filter and a preamplifier. The AE sensor has a characteristic of resonating at a frequency at which the intensity of the frequency spectrum of the AE wave generated by the partial discharge is maximized, and converts sound waves generated when the partial discharge is generated into an electric signal. Of these electrical signals, only the electrical signal in the frequency region where the internal noise of the preamplifier is minimized with the resonance frequency of the AE sensor as the center is passed through the bandpass filter, and the external discharge is removed to detect the partial discharge. ing.

Furthermore, there is a discharge detection device that chemically detects various derived gases (hereinafter referred to as decomposition gas) decomposed and generated from SF ₆ gas by partial discharge or arc discharge due to abnormality in energization or insulation (Japanese Patent Laid-Open No. Sho 50). -129938). In this discharge detection device, a detection element made of a glass epoxy laminated substrate whose resistance value is reduced by reacting with decomposition gas is disposed inside a sealed container of a gas-insulated electric apparatus filled with SF ₆ , and the resistance of the detection element Monitor the value. When the discharge occurs, SF ₆ is decomposed to generate active gas, and the detection element reacts with the SF ₆ decomposition product gas. Therefore, the discharge can be detected by measuring the decrease in the resistance value of the detection element.

  However, a gas insulating device is installed in the method of detecting an abnormality by receiving an electromagnetic wave accompanying the occurrence of the abnormality with the antenna and the method of detecting an abnormality by detecting an AE wave accompanying the occurrence of the abnormality with an AE sensor. Under the environment of substations, the performance is not fully demonstrated due to the presence of background noise. This is because even if the reception sensitivity / sensor sensitivity is increased in order to increase the detection sensitivity of the abnormality, the background noise is also detected, and the discrimination between the true information indicating the abnormality and the background noise (so-called S / N ratio) is increased. This is extremely difficult. Here, in the insulation abnormality detection device that detects the abnormality by receiving the electromagnetic wave accompanying the occurrence of the abnormality with the antenna, the background noise is canceled by providing the noise detection antenna. Since the background noise of the place where it is provided is not measured, it is considered that the influence of the background noise cannot be completely eliminated.

In this regard, a technique for detecting a decomposed gas chemically is no problem of such background noise, moreover, even an extremely small abnormalities such as partial discharge, because decomposition gas of SF ₆ gas that is normally accumulated There is an advantage that the concentration gradually increases and the detection becomes easy. However, since many of the decomposition gases of SF ₆ gas corrode metals, and many of them have harmful effects on the equipment, usually an adsorbent for adsorbing and removing the decomposition gas is sealed inside the equipment, The concentration is set to a level that does not adversely affect the equipment.

Japanese Patent Laid-Open No. 01-235865 JP-A-5-45402 JP 50-129938 A

As described above, in the gas-insulated power device, since the adsorbent that adsorbs the decomposition gas is sealed in the device, even if it is attempted to detect an energization abnormality or an insulation abnormality based on the decomposition gas of SF ₆ gas, the detection element The cracked gas is adsorbed by the adsorbent before the cracked gas is detected by sensors such as the above, so that the cracked gas cannot be detected well, and its practical use is difficult. That is, since the cracked gas in the gas is detected based on the gas after coming into contact with the adsorbent, the detection sensitivity of the cracked gas is inferior, and it is difficult to detect abnormal occurrences well.

  In addition to the discharge in the spacer, abnormalities that occur in the ground tank include partial discharge that occurs on the surface of the conductor, partial discharge that occurs due to dust and the like in the ground tank, and the like. Among these abnormalities, detection of discharge in spacers that do not self-repair is important for maintenance management, and there is a demand to detect them separately from other abnormalities.

  An object of the present invention is to provide an abnormality detection method for a gas-insulated power device that can detect an internal abnormality with high sensitivity and can detect a discharge in a spacer separately from other abnormalities.

  In order to achieve such an object, the invention according to claim 1 is characterized in that a conductor is housed in a ground tank filled with an insulating gas in a state of being electrically insulated by a spacer, and the insulating gas generated in the ground tank is decomposed. In an abnormality detection method for gas-insulated power equipment that adsorbs and removes gas using an adsorbent, the adsorbent is housed in a closed container separate from the ground tank, and the sealed container is connected to the ground tank so that the inside of the sealed container and the ground tank In the case of detecting abnormalities, the cracked gas is introduced into the sealed container and is adsorbed and removed by the adsorbent. The gas before contact with the material is collected, and the discharge in the spacer is detected based on the detection of the decomposition gas containing C. Here, there are various types of discharges in the spacer, such as partial discharge, corona discharge, streamer discharge, leader discharge and the like.

When a discharge occurs in the spacer in the ground tank, the surface of the spacer is melted and the elements constituting the spacer are released into the insulating gas. The spacer is formed of an insulating material containing C such as an epoxy resin. On the other hand, the insulating gas is a mixed gas containing SF ₆ gas or SF ₆ gas, and does not contain C. For this reason, the discharge in the spacer can be detected based on the detection of the cracked gas containing C.

  The ground tank and the sealed container communicate with each other, and the decomposition gas generated in the ground tank is adsorbed and removed by the adsorbent in the sealed container. For this reason, the density | concentration of the decomposition gas in a ground tank reduces. In the present invention, since the gas before coming into contact with the adsorbent is collected from the collection port, the gas can be collected before the decomposition gas containing C is adsorbed and removed by the adsorbent. Further, the inside of the ground tank is not opened, and the gas can be collected while maintaining the airtightness in the ground tank.

  According to a second aspect of the present invention, the conductor is housed in a ground tank filled with an insulating gas in a state of being electrically insulated by a spacer, and the decomposition gas of the insulating gas generated in the ground tank is absorbed by an adsorbent. In the abnormality detection method for gas-insulated power equipment to be removed by adsorption, the adsorbent is housed in a closed container separate from the ground tank, and the sealed container is detachably connected to the ground tank so that the sealed container and the ground tank are connected. While communicating, the cracked gas is introduced into the sealed container and adsorbed and removed by the adsorbent, while when detecting abnormality, the sealed container is disconnected from the grounded tank with the ground tank side communication path closed, and the adsorbent is analyzed. The discharge in the spacer is detected based on the detection of the cracked gas containing C.

When a discharge occurs in the spacer in the ground tank, the surface of the spacer is melted and the elements constituting the spacer are released into the insulating gas. The spacer is formed of an insulating material containing C such as an epoxy resin. On the other hand, the insulating gas is a mixed gas containing SF ₆ gas or SF ₆ gas, and does not contain C. For this reason, the discharge in the spacer can be detected based on the detection of the cracked gas containing C.

  The ground tank and the sealed container communicate with each other, and the decomposition gas generated in the ground tank is adsorbed and removed by the adsorbent in the sealed container. For this reason, the concentration of the cracked gas in the ground tank decreases, and the cracked gas accumulates in the adsorbent. In the present invention, the sealed container can be separated from the ground tank, and the adsorbent can be taken out for analysis. Since the sealed container is cut off with the ground tank side communication path closed, airtightness in the ground tank can be maintained. That is, the adsorbent can be taken out and analyzed while maintaining the airtightness in the ground tank.

  The abnormality detection method for a gas insulated power device according to claim 1, wherein the adsorbent is housed in a sealed container different from the ground tank, and the sealed container is detachably connected to the ground tank so that the sealed container and the ground tank are connected. In the case of detecting abnormalities, the cracked gas is introduced into the sealed container and is adsorbed and removed by the adsorbent. On the other hand, when abnormality is detected, the gas is adsorbed from the sampling port provided in the communication path from the ground tank to the adsorbent. Since the gas before contact with the material is collected and the discharge in the spacer is detected based on the detection of the cracked gas containing C, the discharge in the spacer, which is more important among the abnormalities occurring in the ground tank, is detected by other abnormalities. And can be detected separately. Further, since the gas can be collected before the decomposition gas containing C is adsorbed and removed by the adsorbent, the detection can be performed in a state where the concentration of the decomposition gas is high. For this reason, the detection of the decomposition gas containing C becomes more reliable, and the discharge in the spacer can be detected more reliably. Furthermore, since the gas can be collected while maintaining the airtightness in the ground tank, an abnormality occurring in the ground tank can be detected without stopping the operation of the gas insulated power device.

  Further, in the abnormality detection method for gas insulated power equipment according to claim 2, the adsorbent is housed in a sealed container different from the ground tank, and the sealed container is detachably connected to the ground tank so as to be grounded. While communicating with the inside of the tank, the cracked gas is introduced into the sealed container and adsorbed and removed by the adsorbent.On the other hand, when detecting an abnormality, the sealed container is disconnected from the grounded tank with the grounded tank side communication path closed. Since the adsorbent is analyzed and the discharge in the spacer is detected based on the detection of the cracked gas containing C, the discharge in the spacer more important among the abnormalities occurring in the ground tank is distinguished from other abnormalities. Can be detected. Even if the concentration of the cracked gas containing C is small, the adsorbed cracked gas is accumulated in the adsorbent, so that the cracked gas can be detected more reliably. That is, the detection of the cracked gas containing C becomes more reliable, and the discharge in the spacer can be detected more reliably. Furthermore, since the adsorbent can be recovered while maintaining the airtightness in the ground tank, an abnormality occurring in the ground tank can be detected without stopping the operation of the gas-insulated power device.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  FIG. 1 shows a gas-insulated power device that implements an example of an abnormality detection method for a gas-insulated power device according to the present invention. This gas-insulated power device accommodates a conductor 3 in a grounded tank 2 in which an insulating gas 1 is sealed in an electrically insulated state, and adsorbs a decomposition gas of the insulating gas 1 generated in the grounded tank 2. Is removed by adsorption. The adsorbent 4 is accommodated in a sealed container 5 different from the ground tank 2 and the sealed container 5 is connected to the ground tank 2 so that the sealed container 5 and the grounded tank 2 communicate with each other. A first on-off valve is provided to close the ground tank side communication path 28 when disconnecting.

  The ground tank 2 is provided with an air supply / exhaust pipe (gas pipe) 6 used for evacuating the inside and sealing the insulating gas 1 and an opening / closing valve 7 for opening and closing the air supply / exhaust pipe 6. In the present embodiment, the ground tank side communication path 28 is the supply / exhaust pipe 6 of the ground tank 2, and the first on-off valve is the on-off valve 7 provided on the supply / exhaust pipe 6. That is, the existing air supply / exhaust pipe 6 and on-off valve 7 normally provided in the ground tank 2 are used. For this reason, attachment of the airtight container 5 is easy. Further, the sealed container 5 can be attached as it is without changing the design of the existing grounded tank 2, and in particular, it can be retrofitted to gas-insulated power equipment that has already been installed and operated. Furthermore, the gas-insulated power device can be returned to its original state by removing the airtight container 5 attached later. In addition, when applying to the gas-insulated electric power apparatus already installed and operated, the adsorbent provided in the ground tank 2 is removed.

  The hermetic container 5 is provided with a hermetic container side communication path 10 and a second on-off valve 11 that closes the hermetic container side communication path 10 when the hermetic container 5 is separated. The closed container side communication path 10 is connected to the ground tank side communication path 28. The sealed container side communication path 10 and the ground tank side communication path 28 are detachably connected by abutting each other's flanges 10a and 6a and fixing them with bolts.

  A sampling port 13 is provided in the communication path 9 from the ground tank 2 to the adsorbent 4 to collect gas before coming into contact with the adsorbent 4. In the present embodiment, a sampling port 13 is provided in the sealed container 5. However, the position where the sampling port 13 is provided is not limited to the sealed container 5, and may be a position where the gas before contacting the adsorbent 4 can be sampled. By providing the sampling port 13 in the sealed container 5, the sampling port 13 can be easily installed and handled as an integrated unit, which is easy to handle. The sampling port 13 is provided with an opening / closing valve 14, and the sampling port 13 is closed at times other than when gas is sampled to ensure airtightness in the ground tank 2 and the sealed container 5.

The conductor (main circuit) 3 is a high-voltage center conductor, for example, and has a cylindrical shape, for example. The conductor 3 is arranged at the center position of a ground tank (equipment jacket) 2 having a cylindrical shape, for example, and is supported by a support insulator (spacer) 8. Insulating gas 1 is, for example, SF ₆ gas, mixed gas containing SF ₆ gas. However, the gas is not limited to these gases, and any gas other than the gas containing C can be used. As the gas other than the gas containing C, for example, N ₂ gas or the like can be used.

  The spacer 8 is, for example, a post type spacer. However, it is not limited to the post type spacer. For example, a disk type spacer, a cone type spacer, or the like may be used, and other types of spacers may be used. The spacer 8 is formed of an insulating material containing C such as an epoxy resin.

  During operation of the gas insulated power device, the first and second on-off valves 7 and 11 are opened to allow the inside of the ground tank 2 and the inside of the sealed container 5 to communicate with each other. Moreover, the on-off valve 14 is closed. When an abnormality such as an energization abnormality or an insulation abnormality occurs in the ground tank 2, a decomposition gas is generated from the insulating gas 1, and the concentration of the decomposition gas increases. The ground tank 2 and the sealed container 5 are in communication with each other, and the decomposition gas naturally diffuses to reach the sealed container 5 and is adsorbed and removed by the adsorbent 4. For this reason, the concentration of the cracked gas in the ground tank 2 can be reduced. Many of the cracked gases are corrosive gases that corrode metals. Since the decomposition gas is adsorbed and removed by the adsorbent 4, the concentration of the decomposition gas does not become so high that the ground tank 2, the conductor 3 and the like are corroded, and these corrosions can be prevented.

  When the sealed container 5 is separated from the ground tank 2, the air tightness in the ground tank 2 can be maintained by closing the ground tank side communication path 28 using the first on-off valve 7. For this reason, the sealed container 5 can be separated without stopping the operation of the gas-insulated power device, and the adsorbent 4 can be taken out and replaced, repaired, or regenerated. Moreover, the airtightness in the airtight container 5 can be maintained by closing the airtight container side communication path 10 by the second on-off valve 11, and an abnormality is caused based on the gas adsorbed on the adsorbent 4 as described later. When the detection is performed, the adsorbent 4 in the separated sealed container 5 can be analyzed without contacting the outside air.

  Abnormalities in the ground tank 2 can be detected as follows. That is, the method for detecting an abnormality of a gas-insulated power device according to the present invention accommodates the conductor 3 in the ground tank 2 in which the insulating gas 1 is sealed while being electrically insulated by the spacer 8 and is generated in the ground tank 2. This is a method for detecting an abnormality of a gas-insulated power device in which the decomposed gas of the insulating gas 1 is adsorbed and removed by the adsorbent 4. The adsorbent 4 is accommodated in a sealed container 5 separate from the ground tank 2, and the sealed container 5 is The ground tank 2 is connected to the grounded tank 5 to communicate with the grounded tank 2, and the decomposition gas is guided into the sealed container 5 to be adsorbed and removed by the adsorbent 4. The gas before coming into contact with the adsorbent 4 is collected from the sampling port 13 provided in the communication passage 9 between 2 and the adsorbent 4, and the discharge in the spacer 8 is detected based on the detection of the decomposition gas containing C. Is. Here, the discharge in the spacer 8 includes various types of discharge, for example, partial discharge, corona discharge, streamer discharge, leader discharge, and the like.

  When an abnormality such as an energization abnormality or an insulation abnormality occurs in the ground tank 2, a decomposition gas is generated from the insulating gas 1. Among the abnormalities occurring in the ground tank 2, the discharge in the spacer 8 is more important from a conservative viewpoint. The spacer 8 is formed of an insulating material containing C, such as an epoxy resin. When discharge occurs in the spacer 8, the surface thereof melts and C is released into the insulating gas 1. On the other hand, the insulating gas 1 does not contain C. For this reason, when cracked gas containing C is detected, the C is derived from the spacer 8, and it is considered that discharge occurred in the spacer 8. Therefore, according to the abnormality detection method of the present invention, the discharge in the spacer 8 that cannot be seen from the outside can be detected separately from other abnormalities.

Examples of the cracked gas containing C include CS ₂ gas and CF ₄ gas. However, it is not limited to these, and other gases may be used as long as they are cracked gases containing C.

  In this abnormality detection method, the gas before contacting the adsorbent 4 can be collected by opening the on-off valve 14 and collecting gas from the collection port 13. For this reason, it is possible to detect cracked gas containing C using a gas containing a larger amount of cracked gas, and more reliably detect the occurrence of discharge in the spacer 8. In addition, since gas can be collected while the inside of the ground tank 2 is sealed, discharge in the spacer 8 can be detected without stopping the operation of the gas-insulated power device. Collection of gas for detecting cracked gas containing C is performed, for example, regularly or irregularly.

  In addition, the first and second on-off valves 7 and 11 may be kept open at the time of operation of the gas-insulated power device, and the adsorption and removal of the decomposition gas by the adsorbent 4 may be continued. The first and second on-off valves 7 and 11 are closed before a predetermined time, so that the adsorption gas 4 cannot be adsorbed and removed by the adsorbent 4, and the concentration of the decomposition gas is increased. good. In this case, the detection of the cracked gas containing C becomes even more reliable.

  Also, an abnormality in the ground tank 2 can be detected as follows. That is, the method for detecting an abnormality of a gas-insulated power device according to the present invention accommodates the conductor 3 in the ground tank 2 in which the insulating gas 1 is sealed while being electrically insulated by the spacer 8 and is generated in the ground tank 2. This is a method for detecting an abnormality of a gas-insulated power device in which the decomposed gas of the insulating gas 1 is adsorbed and removed by the adsorbent 4. The adsorbent 4 is accommodated in a sealed container 5 separate from the ground tank 2 and the sealed container 5 is When connecting to the grounded tank 2 in a separable manner, the sealed container 5 and the grounded tank 2 are communicated, and the cracked gas is guided into the sealed container 5 to be adsorbed and removed by the adsorbent 4 while detecting an abnormality. The adsorbent 4 is analyzed by separating the sealed container 5 from the ground tank 2 with the ground tank side communication path 28 closed, and the discharge in the spacer 8 is detected based on the detection of the cracked gas containing C. That.

  By decomposing and removing the decomposition gas generated by the adsorbent 4 in the sealed container 5, the decomposition gas is accumulated in the adsorbent 4. The first and second on-off valves 7 and 11 are closed, the sealed container 5 is disconnected from the ground tank 2, and the adsorbent 4 is taken out and analyzed in a state where the outside air is shut off. The analysis of the adsorbent 4 detects cracked gas containing C, thereby detecting the occurrence of abnormality in the ground tank 2. Since the decomposition gas is accumulated in the adsorbent 4, the detection of the decomposition gas containing C is easy even if the concentration of the decomposition gas containing C in the ground tank 2 is low, and the occurrence of discharge in the spacer 8 is generated. Can be detected more reliably.

  Here, in order to analyze the gas, it is necessary to release the decomposition gas adsorbed on the adsorbent 4. For example, the gas adsorbed on the adsorbent 4 is released by heating the adsorbent 4. Done. The gas released from the adsorbent 4 is analyzed by, for example, a Fourier transform infrared spectrophotometer (FTIR), a gas chromatograph or the like, and a cracked gas containing C is detected. However, the gas analyzing device is not limited to these, and other devices may be used.

  In the present embodiment, the above two methods, that is, the method of collecting and analyzing the gas before contacting the adsorbent 4 and the method of analyzing the gas adsorbed on the adsorbent 4 are used in combination. However, only one of these two methods may be used.

  Further, the sampling port 13 may be omitted when a method for analyzing the gas before contacting the adsorbent 4 is not used.

  In addition, when the sealed container 5 is separated from the ground tank 2, the second opening / closing valve 11 may be omitted when the adsorbent 4 may touch the outside air.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention.

  For example, you may apply to the gas insulated power apparatus shown in FIG. In addition, the same code | symbol is attached | subjected to the member same as the member of the above-mentioned gas insulated power apparatus, and those description is abbreviate | omitted.

  In this gas insulated power device, the communication path 9 that connects the inside of the ground tank 2 and the inside of the sealed container 5 is used as a circulation path having the forward path 15 and the return path 16, and the gas in the ground tank 2 is sealed from the forward path 15 to the sealed container. A circulation device 22 that circulates from the return path 16 to the ground tank 2 after being guided to 5 and brought into contact with the adsorbent 4 is provided. In the present embodiment, the forward path 15 and the return path 16 are constituted by an inner pipe 17 and an outer pipe 18 arranged in a double tubular shape.

  The double tubular communication passage 9 is formed in the ground tank 2 using the existing air supply / exhaust pipe 6. That is, by inserting the inner pipe 27 into the air supply / exhaust pipe 6, a double pipe is provided as the ground tank side communication path 28, and the sealed container side communication path 10 is constituted by the inner pipe 19 and the outer pipe 29. It is constituted by a double pipe, and the air supply / exhaust pipe 6 and the outer pipe 29, and the inner pipe 27 and the inner pipe 19 are detachably connected. That is, the inner pipe 17 is constituted by the inner pipe 27 and the inner pipe 19, and the outer pipe 18 is constituted by the air supply / exhaust pipe 6 and the outer pipe 29.

  The double tube outer tube 29 opens into the space 20 in the sealed container 5, and the inner tube 19 opens into the adsorbent housing chamber 21 in the sealed container 5. Further, a circulation device 22 for sending the gas in the space 20 into the adsorbent accommodating chamber 21 is installed at the entrance of the adsorbent accommodating chamber 21. The circulation device 22 is an electric fan driven by a motor (not shown), for example. The sampling port 13 is provided in the middle of the double tube outer tube 29.

  When the circulation device 22 is started, the space 20 in the sealed container 5 has a negative pressure, and the adsorbent storage chamber 21 has a positive pressure, so that a forced gas flow is formed. The gas in the ground tank 2 is sucked into a space between the air supply / exhaust pipe 6 and the inner pipe 27 (hereinafter referred to as an air supply / exhaust pipe outer passage), and a space between the outer pipe 29 and the inner pipe 19 of the double pipe (hereinafter referred to as the internal pipe 19) (Referred to as a double pipe outer passage) and sucked into the space 20 in the sealed container 5. Then, after being sent into the adsorbent accommodating chamber 21 by the circulation device 22 and contacting the adsorbent 4, the space in the inner pipe 19 of the double pipe (hereinafter referred to as the double pipe inner passage) → inside the air supply / exhaust pipe 6 The inner space of the inner pipe 27 (hereinafter referred to as an air supply / exhaust pipe inner passage) is forcedly circulated into the ground tank 2. The cracked gas generated in the ground tank 2 reaches this adsorbent 4 on this flow and is adsorbed and removed.

  In this way, the communication path is a circulation path, and the circulation device 22 is provided to forcibly circulate the gas, so that the decomposition gas is adsorbed more quickly than when waiting for the decomposition gas to reach the adsorbent 4 by natural diffusion. In addition to being able to be removed, it is possible to prevent the decomposition gas from remaining in the ground tank 2.

  Moreover, since the gas before contacting the adsorbent 4 flows through the double pipe outer passage, the gas in the state before contacting the adsorbent 4 can be collected from the sampling port 13.

  In the above description, the supply / exhaust pipe outer passage and the double pipe outer passage are defined as the forward path 15, and the double pipe inner path and the supply / exhaust pipe inner passage are defined as the return path 16. The double pipe inner passage and the supply / exhaust pipe inner passage may be the forward path 15, and the supply / exhaust pipe outer passage and the double pipe outer passage may be the return path 16.

  In the above description, the circulation device 22 is provided at the inlet of the adsorbent accommodating chamber 21, but the circulation device 22 is moved to another position as long as it is a position where a forced circulation flow of gas can be generated. It may be provided.

  Here, the double pipe structure of the communication path 9 will be described. As the double pipe structure of the communication passage 9, for example, a double pipe is used when the gas insulated power device is operated, but when the sealed container 5 is separated from the ground tank 2, a single pipe structure is adopted. Can be considered. An example is shown in FIG. The inner tube 17 of the communication passage 9 is formed of a flexible tube, for example. A tube winding device 23 is provided in the sealed container 5. By winding the inner tube 17 with the tube winding device 23, the inner tube 17 can be pulled out from the outer tube 18. Further, the wound inner tube 17 can be fed into the outer tube 18 by the tube winding device 23. By communicating the inner pipe 17, the communication path 9 has a double pipe structure. That is, the inner tube 27 and the double tube inner tube 19 are formed of a single tube.

  The first on-off valve 7 and the second on-off valve 11 are, for example, full-bore type ball valves that can ensure the cross section and linearity of the air supply / exhaust pipe 6 or the outer pipe 29 in the open state as valves. By opening the first and second on-off valves 7 and 11, the inner pipe 17 can be fed into the outer pipe 18 constituted by the outer pipe 29 and the air supply / exhaust pipe 6. In addition, the first and second on-off valves 7 and 11 can be closed by winding up the inner pipe 17. However, valves other than the full bore type ball valve may be used as the first and second on-off valves 7 and 11.

  During operation of the gas-insulated power device, the first and second on-off valves 7 and 11 are opened, and the inner pipe 17 is sent into the outer pipe 18 so that the communication path 9 includes the forward path 15 and the return path 16. It can be a circuit. When the sealed container 5 is separated from the ground tank 2, after the inner tube 17 is wound up by the tube winding device 23, the first and second on-off valves 7 and 11 are closed and the outer supply pipe 6 is The tube 29 may be removed. When the separated sealed container 5 is attached to the ground tank 2, after connecting the outer pipe 29 to the supply / exhaust pipe 6 in the atmosphere of the insulating gas 1, the first and second on-off valves 7 and 11 are opened, and the tube The inner tube 17 may be sent out into the outer tube 18 by the winding device 23.

  The electric tube winding device 23 is remotely operated from the outside of the sealed container 5. However, a manual tube winding device 23 may be used in place of the electric tube winding device 23. In this case, the tube winding device 23 is driven by operating a handle provided with a gas seal. Let

  Further, instead of using a flexible tube as the inner tube 17, the inner tube 17 having a bellows structure may be used, and the inner tube 17 may be inserted into or pulled out from the outer tube 18 by expanding and contracting. As a means for expanding and contracting the bellows-structured inner tube 17, for example, it is conceivable to insert a rod into the inner tube 17 to connect the tips thereof, and to extend and contract the bellows-structured inner tube 17 by operating the rod. Alternatively, the inner tube 17 can be expanded and contracted as a whole by forming the inner tube 17 with a telescopic cylinder structure, that is, a plurality of pipes having slightly different diameters, and sequentially storing and pulling each pipe into and from the adjacent pipe. The structure may be inserted into the outer tube 18 or pulled out by expanding and contracting. As a means for expanding and contracting the inner tube 17 having this structure, for example, it is conceivable to insert a rod into the inner tube 17 to connect the tips thereof, and to expand and contract the inner tube 17 by operating the rod.

  Further, instead of the extendable inner tube 17, for example, a non-expandable inner tube 17 such as a metal pipe may be used. That is, the long inner tube 17 may be pulled out in the axial direction as it is. In this case, the structure can be simplified. However, since a space in which the inner tube 17 can be pulled out in the axial direction in the direction of arrow A in FIG. 3 is required, it is effective when such a space can be secured.

  Moreover, as a double pipe structure of the communication path 9, in addition to the structure in which the closed container 5 is separated from the ground tank 2 described above, a single pipe cannot be used and a double pipe is always used. It is also possible to adopt the structure that is used. In this case, as the first and second on-off valves 7 and 11, for example, as shown in FIG. 4, the through holes in the balls 7 a and 11 a of the full bore type ball valve have the same diameter as the double pipe of the communication passage 9. As a double structure to be connected, it can be considered that both the forward path 15 and the return path 16 can be opened and closed simultaneously.

  In the above description, the communication path 9 is configured using the existing air supply / exhaust pipe 6 in the ground tank 2, but the communication path 9 may be provided separately from the air supply / exhaust pipe 6. An example of this is shown in FIG. In this example, a hole is formed in an existing handhole flange (opening flange) lid 24 in the ground tank 2, and a double pipe 30 serving as a ground tank side communication path 28 is fixed to the sealed tank side communication path 10. The double pipe 31 is connected. In this case, since the diameter of each double pipe 30 and 31 can be freely selected to some extent, the degree of freedom in designing the communication path 9 is improved, and the formation of the communication path 9 is easy. However, the fixing position of the double pipe 30 is not limited to the hand hole flange cover 24.

  Further, for example, the present invention may be applied to the gas insulated power device shown in FIG. In addition, the same code | symbol is attached | subjected to the member same as the member of the above-mentioned gas insulated power apparatus, and those description is abbreviate | omitted.

  This gas-insulated power device is constituted by pipes 25, 26, 32, and 33 in which an outward path 15 and a return path 16 are separately provided. For example, the pipes 25 and 26 are fixed by providing holes in the hand hole flange lid 24. The pipes 32 and 33 are fixed to the sealed container 5. The pipe 32 is connected to the pipe 25 and the pipe 33 is connected to the pipe 26 so as to be separable.

  The handhole flange cover 24 has a larger diameter than the air supply / exhaust pipe 6 and can be installed with a distance between the forward path 15 and the return path 16 as compared with the case where the communication path 9 has a double pipe structure. For this reason, it is possible to circulate the gas more efficiently in the ground tank 2 and to further prevent the decomposition gas from remaining in the ground tank 2. Further, the pipes 25 and 26 are easily fixed to the handhole flange lid 24, and the manufacture of the gas insulated power device is simple. The pipes 25 and 26 may be fixed to portions other than the hand hole flange lid 24. Moreover, you may comprise either one of each piping 25 and 26 using the air supply / exhaust pipe 6. FIG. Further, when two or more handhole flange lids 24 are provided in the same gas section of the gas-insulated power device, a pipe 25 serving as the forward path 15 and a pipe 26 serving as the return path 16 are provided in different handhole flange lids 24. May be fixed. In this case, since the forward path 15 and the return path 16 can be further separated from each other, the gas can be circulated more efficiently in the ground tank 2, and the residual cracked gas in the ground tank 2 can be further prevented. it can.

It is a schematic block diagram which shows 1st Embodiment of the gas insulated power apparatus which implements the abnormality detection method of this invention. It is a schematic block diagram which shows 2nd Embodiment of the gas insulated power apparatus which implements the abnormality detection method of this invention. It is a schematic block diagram which shows the example of the structure which expands / contracts the inner pipe | tube of a communicating path. The 1st and 2nd on-off valve is shown, (A) is sectional drawing of an open circuit state, (B) is sectional drawing of a closed state. It is a schematic block diagram which shows the modification of the gas insulated power apparatus of FIG. It is a schematic block diagram which shows 3rd Embodiment of the gas insulated power apparatus which implements the abnormality detection method of this invention.

Explanation of symbols

1 Insulating gas 2 Ground tank 3 Conductor 4 Adsorbent 5 Sealed container 6 Ground tank side communication path 8 Spacer 9 Communication path 13 Sampling port

Claims (2)

  A gas-insulated power device that accommodates a conductor in a grounded tank filled with insulating gas in a state of being electrically insulated by a spacer, and adsorbs and removes the decomposition gas generated in the grounded tank by an adsorbent. In the abnormality detection method, the adsorbent is accommodated in a sealed container different from the ground tank, and the sealed container is connected to the ground tank so that the sealed container and the grounded tank communicate with each other. When the gas is introduced into the sealed container and adsorbed and removed by the adsorbent, and when abnormality is detected, the adsorbent is collected from a sampling port provided in a communication path from the grounded tank to the adsorbent. An abnormality detection method for gas-insulated power equipment, comprising: collecting a gas before contacting the gas and detecting a discharge in the spacer based on detection of cracked gas containing C.   A gas-insulated power device that accommodates a conductor in a grounded tank filled with insulating gas in a state of being electrically insulated by a spacer, and adsorbs and removes the decomposition gas generated in the grounded tank by an adsorbent. In the abnormality detection method, the adsorbent is housed in a sealed container different from the ground tank, and the sealed container is detachably connected to the ground tank so that the sealed container communicates with the ground tank. When the cracked gas is introduced into the sealed container and adsorbed and removed by the adsorbent, the abnormality is detected by separating the sealed container from the grounded tank with the grounded tank side communication path closed. Abnormality of gas-insulated power equipment, characterized in that an adsorbent is analyzed and discharge in the spacer is detected based on detection of cracked gas containing C Way out.

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