JP4801541B2 - Gas insulated power equipment - Google Patents

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) ), Cubicle-type gas switchgear (C-GIS), gas-insulated transformers, pipeline gas-insulated power transmission lines (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 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 enclosed 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.

  Moreover, when improving the detection sensitivity of decomposition gas, there exists a request | requirement of raising the detection efficiency using natural force as much as possible.

  The present invention provides a gas-insulated power device that can detect an internal abnormality with high sensitivity and that can improve the efficiency of abnormality detection using natural force without using power. With the goal.

  In order to achieve this object, the invention according to claim 1 is characterized in that the conductor is electrically insulated in a grounded tank filled with an insulating gas and the decomposition gas of the insulating gas generated in the grounded tank is contained. In gas-insulated power equipment that adsorbs and removes with an adsorbent, the adsorbent is housed in a closed container that is separate from the ground tank, and the sealed container is connected to the ground tank, and the ground tank is connected to the ground tank via the sealed container. A heat collection system that connects the inside of the sealed container and the inside of the grounded tank by a return circuit, and is located higher in the downstream than the upstream in the circuit and warms the internal gas to generate a rising force when exposed to sunlight. A part is provided.

  When an abnormality such as energization abnormality or insulation abnormality occurs in the ground tank, decomposition gas is generated from the insulating gas, and the concentration of the decomposition gas increases. The inside of the ground tank and the inside of the sealed container are communicated by a circulation path, and the decomposition gas generated in the ground tank flows into the sealed container and is adsorbed and removed by the adsorbent. At this time, since the heat collecting part provided in the middle of the circulation path receives sunlight and warms the internal gas to generate an upward force, a gas flow is generated in the circulation path using the upward force as a driving force. Along with this gas flow, the cracked gas also flows to the sealed container, contacts the adsorbent and is removed by adsorption. Therefore, the concentration of cracked gas in the ground tank decreases rapidly. The remaining gas from which the cracked gas has been removed circulates from the sealed container into the ground tank. In addition, if the heat collecting part is not exposed to sunlight, it is not possible to generate a gas ascending force, and it is not possible to generate a positive gas flow. Since they are in communication, the cracked gas generated in the ground tank reaches the sealed container by natural diffusion and is adsorbed and removed by the adsorbent.

  Further, in the gas insulated power device according to claim 2, the surface of the heat collecting part is colored darker than the surface of the circulation path. Therefore, when the sunlight is received, the temperature rise of the heat collecting part is larger than that of the circulation path, and the gas flowing into the heat collection part from the circulation path can be reliably heated.

  In the gas insulated power device according to the third aspect, the heat collection fin is provided on the surface of the heat collection unit. Therefore, when the sunlight is received, the temperature rise of the heat collecting part is larger than that of the circulation path, and the gas flowing into the heat collection part from the circulation path can be reliably heated.

  The gas-insulated power device according to claim 4 includes a first on-off valve capable of separating the sealed container from the ground tank, and closing the ground tank-side communication path of the circulation path when the sealed container is detached. . Therefore, when the sealed container is separated, the airtightness in the ground tank can be maintained by closing the ground tank side communication path using the first on-off valve. That is, the adsorbent can be taken out while maintaining the airtightness in the ground tank.

  The gas insulated power device according to claim 5 includes a second on-off valve that closes the closed vessel side communication path of the circulation path when the closed vessel is separated. Therefore, when the sealed container is separated, the hermeticity in the sealed container can be maintained by closing the sealed container side communication path using the second on-off valve.

  Furthermore, the gas insulated power equipment according to claim 6 is provided with a sampling port for collecting the gas before coming into contact with the adsorbent in the circulation path from the ground tank to the adsorbent. Therefore, it is possible to collect a gas before it comes into contact with the adsorbent, that is, a gas containing a decomposition gas.

  In the gas-insulated power device according to claim 1, the adsorbent is accommodated in a sealed container different from the ground tank, and the sealed container is connected to the ground tank, and returns from the ground tank to the ground tank via the sealed container. A heat collecting part that connects the inside of the sealed container and the inside of the grounded tank by a circulation path, is arranged higher in the downstream than the upstream side in the middle of the circulation path, and generates a rising force by heating the internal gas when receiving sunlight. Therefore, the decomposition gas generated in the ground tank can be adsorbed and removed by the adsorbent in the sealed container. For this reason, the increase in the density | concentration of a corrosive decomposition gas can be suppressed. In addition, when the heat collecting part is exposed to sunlight, a gas flow can be generated in the circulation path by the rising force of the gas generated in the heat collecting part. The gas can be circulated quickly and the cracked gas can be efficiently removed. Moreover, since the heat collecting part generates the gas ascending force using sunlight, it is energy saving as compared with the case where a flow is formed using an electric motor, and it is difficult to break and is easy to maintain.

  Further, in the gas insulated power device according to claim 2, since the surface of the heat collecting part is colored in a darker color than the surface of the circulation path, the gas ascending force is surely generated when receiving sunlight. Thus, a gas flow can be reliably generated in the circulation path.

  Further, in the gas insulated power device according to claim 3, since the heat collecting fin is provided on the surface of the heat collecting part, it is possible to reliably generate a gas rising force when receiving sunlight, and the circulation path. A gas flow can be reliably generated inside.

  Further, in the gas insulated power device according to the fourth aspect, since the sealed container is detachable from the ground tank, the first on-off valve is provided to close the ground tank side communication path of the circulation path when the sealed container is disconnected. The adsorbent can be taken out by separating the sealed container without opening the ground tank to the atmosphere, and the adsorbent can be taken out or replaced without stopping the operation of the gas insulated power device. Moreover, even if some trouble occurs in the sealed container, the entire sealed container can be replaced.

  Further, in the gas insulated power device according to claim 5, since the second opening / closing valve for closing the closed container side communication path of the circulation path is provided when the closed container is disconnected, the closed container is disconnected from the ground tank while being sealed. be able to. For this reason, the adsorbent can be transported without being in contact with the atmosphere, and the adsorbent can be subjected to analysis in a state where the decomposition gas is adsorbed.

  Furthermore, in the gas insulated power equipment according to claim 6, since the sampling port for collecting the gas before contacting the adsorbent is provided in the circulation path from the grounded tank to the adsorbent, the gas insulation power device before touching the adsorbent is provided. Gas containing cracked gas can be collected. For this reason, when analyzing gas, compared with the gas insulated power equipment of the structure which arrange | positions an adsorbent in a ground tank, detection of decomposition gas is easy.

  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 first embodiment of a gas insulated power device of 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. Then, the adsorbent 4 is accommodated in a closed container 5 different from the ground tank 2, and the closed container 5 is connected to the ground tank 2, and the circulation path 9 returns from the ground tank 2 to the ground tank through the sealed container. Is used to connect the inside of the sealed container 5 and the inside of the grounded tank 2, and the downstream side is arranged higher in the circulation path 9 than the upstream side, and when the sunlight is received, the internal gas is warmed to generate a rising force. A portion 34 is provided. In the present embodiment, the sealed container 5 can be separated from the ground tank 2.

FIG. 2 shows a cross section of the ground tank 2. FIG. 2 is a cross-section at a position different from the position where the handhole flange is provided. 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 for example, N ₂ gas, CO ₂ gas, C ₃ F ₈ gas, c-C ₄ F ₈ gas, CF ₃ I gas, CF ₄ gas, and a mixed gas thereof may be used. .

  The circulation path 9 includes an outward path 15 that guides the gas in the ground tank 2 into the sealed container 5, and a return path 16 that returns the gas in the sealed container 5 to the ground tank 2. The forward path 15 includes a pipe 25 and a pipe 32, and the return path 16 includes a pipe 33 and a pipe 26. The pipes 32 and 33 are airtight container side communication passages, and are fixed to the airtight container 5. The pipes 25 and 26 are ground tank side communication paths, and are fixed to the handhole flange lid 24 with holes, for example. By fixing the pipes 25 and 26 to the handhole flange lid 24, when attaching to the existing ground tank 2, the sealed container 5 can be attached as it is without changing the design of the existing ground tank 2 itself. Gas-insulated power equipment that has already been installed and operated can be retrofitted by replacing the handhole flange lid 24. Furthermore, by returning the exchanged handhole flange lid 24 to the original state, it is possible to remove the retrofitted sealed container 5 and return the gas-insulated power device to its original state. 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 pipe 25 and the pipe 32 are detachably connected by abutting each other flanges 25a and 32a and fixing them with bolts. Similarly, the pipe 26 and the pipe 33 are detachably connected by abutting each other's flanges 26a and 33a and fixing them with bolts.

  The pipes 25 and 26 which are the ground tank side communication paths are provided with a first on-off valve 7 which closes the ground tank side communication path when the sealed container 5 is separated. In addition, the pipes 32 and 33 that are the closed container side communication path are provided with a second on-off valve 11 that closes the closed container side communication path when the closed container 5 is disconnected.

  A heat collecting section 34 is provided in the middle of the circulation path 9. In the present embodiment, the sealed container 5 is used as the heat collecting unit 34. The surface of the heat collecting part 34, that is, the sealed container 5, is darker than the surface of the circulation path 9, for example, the circulation path 9 is colored light gray, whereas the heat collecting part 34 is colored black. The sealed container 5 is disposed, for example, in a sunny place. The sealed container 5 is arranged higher on the downstream side than the upstream side, and has a structure in which gas passes through the space in the sealed container 5 from the bottom to the top. In the present embodiment, the pipe 32 on the upstream side is connected to the bottom surface of the sealed container 5, and the pipe 33 on the downstream side is connected to the top surface of the sealed container 5, so that the gas flows from the bottom to the top in the sealed container 5. The structure is easier to pass through.

  The adsorbent 4 in the sealed container 5 is also heated in response to sunlight, but the temperature of the adsorbent 4 does not increase so high that the decomposition gas adsorbed on the adsorbent 4 is released by heating with sunlight. .

  In addition, a sampling port 13 is provided in the circulation path 9 from the ground tank 2 to the adsorbent 4 to collect gas before contacting 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.

  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 the closed container 5 is exposed to sunlight, the closed container 5 is heated and the temperature rises. Therefore, the gas in the sealed container 5 is also warmed and a rising force is generated. This rising force circulates the gas in the ground tank 2 in the order of the ground tank 2 → the forward path 15 → the sealed container 5 → the return path 16 → the ground tank 2. Since the surface of the sealed container 5 is colored darker than the surface of the circulation path 9, the temperature rise when receiving sunlight is greater than the temperature rise of the circulation path 9. For this reason, a temperature difference occurs between the forward path 15 and the sealed container 5, and the gas flowing into the sealed container 5 from the forward path 15 can be reliably warmed in the sealed container 5, and the gas ascending force can be reliably ensured. Can be generated.

  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. The cracked gas generated in the ground tank 2 reaches the sealed container 5 along the gas flow formed in the circulation path 9 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. Since a positive flow is formed in the circulation path 9 by the ascending force generated in the sealed container 5, the cracked gas in the ground tank 2 can be quickly moved to the sealed container 5, and quickly the cracked gas Can be removed by adsorption, and the decomposition gas can be prevented from remaining in the ground tank 2. 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.

  Moreover, since the heat collection part 34 forms a positive flow in the circulation path 9 using natural energy, it is energy saving as compared with the case where a flow is formed using an electric motor, and it is difficult to break and is maintained. Easy to manage.

  When the sealed container 5 is disconnected from the ground tank 2, the air tightness in the ground tank 2 can be maintained by closing the ground tank side communication path 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. Further, it becomes possible to make the adsorbent 4 itself an object of analysis. Moreover, the airtightness in the airtight container 5 can be maintained by closing the airtight container side communication path by the second on-off valve 11, and the analysis is performed without bringing the adsorbent 4 in the airtight container 5 into contact with the outside air. be able to.

  The hand hole flange cover 24 has a certain diameter and can be installed with the forward path 15 and the return path 16 separated. For this reason, the gas in the ground tank 2 can be circulated efficiently, and the decomposition gas in the ground tank 2 can be prevented from remaining. 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.

  In general, gas-insulated power equipment is preliminarily provided with an air supply / exhaust pipe for enclosing insulating gas and an on-off valve for opening and closing the air supply / exhaust pipe. A supply / exhaust pipe may be used as one of the pipes 25 and 26. Further, as the first on-off valve 7, an on-off valve that opens and closes the supply / exhaust pipe may be used.

  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.

  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, in the above description, the surface of the sealed container 5 as the heat collecting unit 34 is colored in a darker color than the surface of the circulation path 9 so that the temperature rise when receiving sunlight is larger than that of the circulation path 9. Although the gas ascending force is generated, the present invention is not necessarily limited to this configuration, and any gas can be used as long as the gas in the heat collecting section 34 can be heated by sunlight to generate the ascending force. For example, as shown in FIG. 3, heat collecting fins 34 a may be provided on the surface of the heat collecting section 34 so that the temperature rise when receiving sunlight is larger than that of the circulation path 9. In this case, even if the surface of the heat collecting section 34 is not colored darker than the surface of the circulation path 9, a temperature difference is generated between the forward path 15 and the sealed container 5, and the inside of the sealed container 5 is formed from the forward path 15. The gas that has flowed into the gas can be reliably warmed in the sealed container 5, and a gas rising force can be reliably generated. In this case as well, the surface of the heat collecting section 34 may be colored darker than the surface of the circulation path 9.

  In the above description, the sealed container 5 is used as the heat collecting unit 34, but the heat collecting unit 34 may be provided separately from the sealed container 5. For example, as shown in FIG. 4, a part of the piping 33 may be arranged vertically, and the heat collecting part 34 may be provided in this vertical part. In the example of FIG. 4, the heat collecting portion 34 is provided by coloring the surface of the vertical portion in a darker color than the portions of the other circulation paths 9. However, the heat collecting portion 34 a is formed by forming the heat collecting fins 34 a. 34 may be provided. Moreover, you may provide the heat collecting part 34 by coloring the surface darker than others and forming a heat collecting fin. In the example of FIG. 4, the heat collecting part 34 is formed in the pipe 33, but the heat collecting part 34 may be formed in the other pipes 32, 25, and 26. Further, the heat collecting section 34 may be provided on the upstream side or the downstream side of the sealed container 5.

  In the above description, the sampling port 13 for collecting the gas before contacting the adsorbent 4 is provided. However, when there is no need to collect the gas before contacting the adsorbent 4, the sampling port 13 is used. May be omitted.

  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.

It is a schematic block diagram which shows an example of embodiment of the gas insulated power equipment of this invention. It is sectional drawing of a ground tank. It is a schematic block diagram which shows the other example of a heat collecting part. It is a schematic block diagram which shows the other example of a heat collecting part.

Explanation of symbols

1 Insulating gas 2 Ground tank 3 Conductor 4 Adsorbent 5 Sealed container 9 Circulation path 13 Sampling port 34 Heat collecting part

Claims (6)

  In a gas-insulated power device that accommodates a conductor in a grounded tank filled with insulating gas in an electrically insulated state, and adsorbs and removes the decomposition gas of the insulating gas generated in the grounded tank with an adsorbent, The adsorbent is housed in a sealed container different from the ground tank, and the sealed container is connected to the ground tank, and the sealed container is connected to the ground tank by a circulation path that returns from the ground tank to the ground tank via the sealed container. A heat collecting section is provided in which the inside of the container communicates with the inside of the grounded tank, and the downstream side is disposed higher than the upstream side in the middle of the circulation path, and the internal gas is warmed to generate a rising force when receiving sunlight. Gas insulated power equipment characterized by that.   The gas insulated power device according to claim 1, wherein the surface of the heat collecting unit is colored darker than the surface of the circulation path.   The gas insulated power device according to claim 1, wherein a heat collecting fin is provided on a surface of the heat collecting unit.   The said airtight container is separable from the said grounding tank, and when separating the said airtight container, it has a 1st on-off valve which closes the grounding tank side communication path of the said circulation path, The any one of Claim 1 to 3 characterized by the above-mentioned. Or a gas-insulated power device according to any one of the above.   5. The gas insulated power device according to claim 4, further comprising a second on-off valve that closes the closed container side communication path of the circulation path when the closed container is separated.   6. The sampling port according to claim 1, wherein a sampling port is provided in the circulation path from the ground tank to the adsorbent to collect gas before contacting the adsorbent. Gas insulated power equipment.

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