JP4564466B2 - Gas insulation equipment - Google Patents

Description

  The present invention includes a high voltage conductor, a ground tank for sealing the high voltage conductor, and an insulating support for insulating support between the high voltage conductor and the ground tank, and further includes the high voltage conductor and the ground tank. The present invention relates to a gas insulating device in which an insulating gas for maintaining insulation is enclosed.

  A configuration example of a general gas insulation device currently used will be described with reference to a pipeline bus shown in FIG. This gas insulation apparatus includes a cylindrical grounding tank 1 arranged in parallel with the installation surface, and a high-voltage conductor 2 for energization inserted into the grounding tank. The high voltage conductor 2 is insulated and supported from the ground tank 1 by an insulating support 3.

  The insulating support 3 is also referred to as an insulating spacer, and a peripheral portion of the cone shape is sandwiched between flange portions of the ground tank and fixed to the ground tank. On the other hand, a buried electrode 4 is provided in the central portion thereof, and the coaxiality between the high voltage conductor 2 and the ground tank 1 is secured by connecting the buried electrode 4 and the end of the high voltage conductor 2. .

Insulating gas 5 for maintaining insulation between the high voltage conductor 2 and the grounding tank 1 is sealed inside the grounding tank 1. As this insulating gas 5, SF ₆ excellent in insulating performance is currently used.

  Substations with many such gas-insulated devices are the foundation of society's electrical energy, so high insulation reliability is required. In Japan, they are applied to underground substations in urban areas. Due to the need, miniaturization is required and further technological innovation is required.

In other words, the SF ₆ gas used as the insulation gas of the current gas insulation equipment was designated as a global warming gas at the Kyoto Conference on Global Warming Prevention (COP3), so the amount of SF ₆ emissions currently on a global scale Reduction is desired. Therefore, in view of the influence on the global environment, it is important to develop a gas insulation device that further reduces the size of the device and reduces the amount of SF ₆ gas used.

However, as a gas that replaces SF ₆ gas, it has an insulation performance superior to that of SF ₆ among the existing gases, and it satisfies the required items such as toxicity, explosiveness, liquefaction temperature, etc. There is no practical gas that can be applied to this. Moreover, while further downsizing of the device is required as in the present, it is not desirable to increase the size of the device by applying SF ₆ alternative gas having poor insulation performance.

Under such circumstances, in developing an alternative gas insulation device that replaces SF ₆ gas, the gas itself has a good environmental or chemical property although its insulation performance is inferior to that of SF _6. Techniques that use other insulation techniques in combination with insulation performance have been studied.

As described above, as a technique for using other insulation techniques in combination with the insulation performance of the gas itself, as described in Patent Document 1 and Patent Document 2, solid cylindrical insulation is provided between the high-voltage conductor and the ground tank. An invention constituting a barrier has been proposed. In these inventions, the insulating barrier is inserted between the high-voltage conductor and the ground tank to cut off the insulating gas discharge path from the high-voltage conductor to the ground tank. For this reason, in order to generate dielectric breakdown, it is necessary to penetrate the insulation barrier. In order to penetrate such a barrier, it is necessary to apply a voltage higher than the dielectric breakdown voltage of the gas alone, so that the insulation performance as a device is improved.
JP 2001-057726 A JP 2002-152927 A

  However, since the insulation barrier insertion technology having the configuration as disclosed in Patent Document 1 and Patent Document 2 requires an improved configuration for inserting an insulation barrier with respect to the configuration of the current gas insulation device, the alternative gas insulation device The cost for manufacturing the product becomes relatively large. In addition, unless the connection state between the insulating barrier and the support insulator is optimized, there is a risk of causing dielectric breakdown due to the formation of an insulating weak point at that portion.

  In Patent Document 2, a technique for applying a solid insulating coating to the surface of a high-voltage conductor has been studied. Since this technology coats the surface roughness latent on the surface of the high voltage conductor with an insulating coating, it prevents the generation of electron avalanche starting from the surface irregularities, thereby improving the dielectric strength.

  However, when an insulating coating is applied to the surface of the high voltage conductor, there is a sufficient possibility that bubbles will be contained inside the coating. If small bubbles are present inside the conductor surface insulation coating, there is a risk that partial discharge occurs inside the bubbles and this leads to dielectric breakdown. Therefore, it is necessary to establish a technique for managing air bubbles inside the coating. Also, the presence of the surface roughness of the surface of the insulating coating itself may supply initial electrons that cause discharge in a portion having a rough surface roughness, which may cause a dielectric breakdown.

The present invention, above problems has been proposed in order to solve, ensure sufficient insulation performance even when using low gas insulation performance than SF ₆ as an alternative gas of SF ₆ gas In addition, the basic configuration of a conventional gas insulation device, such as a ground tank and an insulating support embedded electrode, is not significantly changed, and an extra portion such as an insulation barrier or its supporting member is used. An object of the present invention is to provide a gas insulating device in which a member does not need to be disposed in a ground tank.

To achieve the above object, the present invention comprises a high voltage conductor, a ground tank for sealing the high voltage conductor, and an insulating support for insulatingly supporting the high voltage conductor and the ground tank. In the gas insulation apparatus in which an embedded electrode is provided in the central portion of the insulating support, and an insulating gas is sealed between the high voltage conductor and the ground tank to keep insulation, the high voltage conductor is electrically conductive on the inner surface. The embedded electrode is inserted into an end of the insulating cylinder, and the embedded electrode and the conductive material on the inner surface of the insulating cylinder are electrically connected. The insulating cylinder and the embedded electrode A connecting material is formed with a sealing material for gas classification, and a conductive liquid or a conductive gel body is injected inside the insulating cylinder .

  The high-voltage conductor is composed of the insulating tube and a metal conductor inserted inside the insulating tube, and the end of the metal conductor is electrically and structurally connected to the embedded electrode of the insulating support. Being connected is also one embodiment of the present invention.

Further, the high voltage conductor is composed of an insulating tube having a resistive material disposed on the inner surface thereof and a metal conductor inserted inside the insulating tube, and the embedded electrode is inserted into an end of the insulating tube. In addition, an end portion of the metal conductor is electrically and structurally connected to the embedded electrode of the insulating support, and a sealing material for gas classification is formed at a connection portion between the insulating cylinder and the embedded electrode, and the insulation It is also an embodiment of the present invention that a conductive liquid or a conductive gel body is injected inside the cylinder .

According to the present invention, it is possible to obtain an SF ₆ alternative gas insulation device that is much more practical than previously proposed. In particular, even when the present invention is applied to a device that uses an alternative gas whose insulating performance is inferior to that of SF ₆ gas as an insulating gas, a small SF ₆ alternative gas insulating device having insulation reliability is put on the market. be able to. In addition, since the basic configuration of the gas insulation device itself is the same as that of the conventional device, the commonality of parts and the ease of replacement work can be ensured.

(1) First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same member as the prior art example shown in FIG. 9, and description is abbreviate | omitted.

  The structural feature of the first embodiment is that an insulating tube 6 having a conductive material 7 disposed on the inner surface is provided as a high-voltage conductor inserted into the ground tank 1. An embedded electrode 4 provided at the center of the insulating support 3 is inserted into the end of the insulating cylinder 6, and the embedded electrode 4 and the conductive material 7 on the inner surface of the insulating cylinder 3 are electrically connected.

  Here, the insulating cylinder 6 has the same outer diameter as that of the high voltage conductor 2 used in the prior art shown in FIG. 9 and supports the conventional high voltage conductor. It is desirable to use one having a size that can be directly fitted into an opening for inserting a high-voltage conductor provided in the central portion of 3. Further, it is desirable to use an inner diameter having a size such that the embedded electrode 4 inserted in the end portion of the conventional high voltage conductor 2 is fitted as it is.

  Further, as the material of the insulating cylinder 6, for example, glass fiber reinforced plastic (FRP) can be used, but other acrylic resins can also be used. As the conductive material 7 disposed on the inner surface of the insulating cylinder 6, for example, a conductive material having excellent heat resistance such as a thermosetting conductive silicone resin can be used. Further, it can be formed by applying, casting, vapor deposition, or thermal spraying a flexible conductive silicone rubber, a resin such as an epoxy resin containing metal powder or carbon, or a metal film.

The thickness of the conductive material 7 is preferably 100 μm or more in the case of an industrial gas insulated device having a small current carrying capacity, for example, when a high voltage / large current flows as in a gas insulated device for electric power. When the metal conductor 8 has a small diameter, the thickness can be several cm.

In the ground tank 1, SF ₆ , N ₂ , O ₂ , dry air, CO ₂ , CF ₄ , c-C ₄ F ₈ , CCl ₂ , C ₂ F ₆ , C ₃ F ₈ or Any one single gas of CF ₃ I or a mixed gas obtained by mixing any two or more of these gases is enclosed.

Further, a seal made of an elastic material for sealing the space between the insulating cylinder 6 and the insulating support 3 at the connecting portion 9 between the insulating cylinder 6 and the insulating support 3 and distinguishing the gas section inside and outside the insulating cylinder 6. A material 12 is disposed. Further, a conductive liquid or a conductive gel body 13 is injected into the insulating cylinder 6 and the conductive material 7. As this conductive liquid, “water” can be used as an example. Further, an ionized aqueous solution that conducts electricity, for example, a diluted aqueous solution of hydrochloric acid or sodium chloride can be used. Furthermore, a resin having flexibility or fluidity such as conductive silicone rubber or its monomer can be used.

In the invention of the first embodiment having the above-described configuration, since the insulating cylinder 6 exists outside the conductive material 7 to which a high voltage is applied by the operation of the equipment, it is used as the insulating gas 5 in the current equipment. Even if an insulating gas with low insulation performance and low environmental load other than the SF ₆ gas is used, the dielectric breakdown phenomenon can be suppressed by the high insulation performance of the insulating cylinder 6.

In addition, the magnitude of the energization current due to the operation of the device cannot flow a large current simply by flowing it through the conductive material 7 on the inner surface of the insulating cylinder 6, but the conductive liquid or conductive injected further inside the insulating cylinder 6 . Since an energization current can be passed through the gel body 13 as well, a current as large as that of conventional equipment can be passed, and it can be sufficiently applied to power gas insulation equipment.

  Further, since the connecting portion 9 between the insulating cylinder 6 and the embedded electrode 4 is the same as the connecting structure with the high voltage conductor in the conventional gas insulating device as shown in FIG. This makes it easier to replace and reduce development and research costs. Therefore, according to the present embodiment, it is possible to provide a gas insulation apparatus that has high insulation reliability and reduced development costs even when an environmentally low load gas is used.

Furthermore, in the first embodiment, since the gas sections inside and outside the insulating cylinder 6 are hermetically separated by the sealing material 12, the conductive liquid or the conductive material inside the insulating cylinder 6 can be used in vacuuming and insulating gas filling work after assembly of the equipment. The conductive gel body 13 does not flow out into the insulating gas 5 outside the insulating cylinder 6. Therefore, there is no phenomenon in which the conductive liquid or the conductive gel body 13 is mixed into the insulating gas 5 outside the insulating cylinder 6 which is a cause of the deterioration of the insulating performance, and a gas insulating device with good insulation reliability can be provided. .

Further, in the first embodiment, a high energization effect can be expected in the first embodiment by injecting the conductive liquid or the conductive gel body 13 into the insulating cylinder 6. That is, the current during the operation of the device flows into the conductive liquid or the conductive gel body 13 on the inner surfaces of the insulating cylinder 6 and the conductive material 7. Therefore, the temperature rise of the conductive material 7 on the inner surface of the insulating cylinder 6 during energization can be suppressed, and the deterioration of the insulating cylinder 6 due to the temperature increase can be suppressed. As a result, it is possible to provide a gas insulating device with good reliability.

(2) Reference Example FIG. 1 is a sectional view showing a reference example of a gas insulation device . The structural feature of this reference example is that a metal conductor 8 for connecting the embedded electrodes 4 of the adjacent insulating support 3 is inserted inside the insulating cylinder 6.

  FIG. 2 is a cross-sectional view showing a reference example of a gas insulating device. The structural feature of this modification is that the metal conductor 8 inserted inside the insulating cylinder 6 in the modification shown in FIG. In the example of FIG. 2, a metal spring is inserted as an example of the metal stretchable body 10, but it can also be configured by a conductive resin having elasticity.

In the reference example having the above-described configuration, a metal spring is inserted as an example of the metal stretchable body 10 to be inserted inside the insulating cylinder 6, so that the connection portion 9 formed in the embedded electrode 4 is special. Therefore, it is possible to configure only by the surface contact by the pushing force of the spring without requiring a simple connection method or a connection structure used in the current apparatus. Therefore, it is possible to reduce the cost related to the connection structure, and as a result, it is possible to provide a gas insulating device that is inexpensive and uses environmentally low load gas and has good insulation reliability.

(3) Reference Example FIG. 3 is a cross-sectional view showing a reference example of a gas insulating device. In the configuration of FIG. 3, the metal conductor 8 is not inserted inside the insulating cylinder 6. In this case, as the conductive member 7 formed on the inner surface of the insulating cylinder 6, a thick member of several centimeters is used in the case of power. Moreover, in the gas insulation apparatus with a small current carrying capacity for industrial use, although the thickness of the electroconductive member 7 is set according to the current carrying capacity, the thickness of 100 μm or more is usually desirable.

In the reference examples as described above, since no metal conductor is inserted inside the insulating cylinder 6, the device can be manufactured at a lower cost than the conventional gas insulating device for industrial use that does not require a large current. It is possible to provide a gas insulation device having good insulation reliability.

(4) Second Embodiment FIG. 4 is a cross-sectional view showing the configuration of a gas insulation device according to a second embodiment . The structural feature of the second embodiment resides in that the insulating support 3 is configured with the air passage 11 that shares the internal and external gas sections of the insulating cylinder 6. This vent path 11 has a vent hole formed in the center of the embedded electrode 4 coaxially with the axial direction of the insulating cylinder 6, the end of the vent hole is extended to the outer periphery of the embedded electrode 4, and the wall of the insulating support 3. The inside of the thickness is bent into an L shape and penetrates to communicate with the space between the ground tank 1 and the insulating cylinder 6.

In the second embodiment having the above-described configuration, the insulating gas sections inside and outside the insulating cylinder 6 can be the same gas section, and when evacuating immediately before the insulating gas 5 is sealed in the gas insulating device, The air existing inside the insulating cylinder 6 is also efficiently discharged at the same time. Therefore, when evacuation is performed before the insulating gas 5 is sealed, no air remains due to insufficient vacuum time, and air does not mix with the insulating gas 5. As described above, a shortage of insulation performance due to the presence of air can be suppressed, and a gas insulation device with good insulation reliability can be provided.

(5) Reference Example FIG. 5 is a cross-sectional view showing a reference example of a gas insulating device . The feature of the reference example shown in FIG. 5 is that the connection between the insulating cylinder 6 and the insulating support 3 is sealed between the insulating cylinder 6 and the insulating support 3 so that the gas sections inside and outside the insulating cylinder 6 are separated. The seal material 12 made of an elastic material for distinguishing is provided.

In the reference example as described above, since the gas sections inside and outside the insulating cylinder 6 are hermetically separated by the sealing material 12, the air gas inside the insulating cylinder is removed from the insulating cylinder 6 in vacuuming and insulating gas filling work after the assembly of the equipment. It does not flow out to the outside insulating gas 5. Therefore, the phenomenon that air is mixed into the insulating gas 5 outside the insulating cylinder 6 which is a cause of the deterioration of the insulating performance is eliminated, and a gas insulating device with good insulation reliability can be provided.

(6) Reference Example FIG. 7 is a cross-sectional view showing a reference example of a gas insulating device . The structural feature of this reference example is that a resistive material 14 is disposed on the inner surface of the insulating cylinder 6, and a metal conductor 8 or a metal stretchable body 10 is disposed inside the insulating cylinder 6. In this case, the resistive material 14 may be a resin such as a thermosetting insulating silicone resin or a flexible insulating silicone rubber, or any other resin used as an insulating film. In addition, the resistive material 14 may be arranged by applying resin or the like, or fixing a member molded into a sheet shape or the inner surface shape of the insulating tube 6 to the inner surface of the insulating tube by bonding or other means. .

In the reference example having the above-described configuration, the application material disposed on the inner surface of the insulating cylinder 6 is not the conductive material but the resistive material 14, so that the energization current during operation is changed to the resistive material on the inner surface of the insulating cylinder 6. It can flow mainly to the metal conductor 8 instead of 14. Therefore, since it is possible to suppress the temperature rise of the resistive material 14 on the inner surface of the insulating cylinder during energization, it is possible to suppress the deterioration of the insulating cylinder 6 due to the temperature rise, and thereby a highly reliable gas insulating device. Can be provided.

(7) Third Embodiment FIG. 8 is a cross-sectional view showing the configuration of a gas insulating apparatus according to a third embodiment . A structural feature of the third embodiment is that the insulating support 3 is configured with a pipe 15 communicating from the gas section inside the insulating cylinder 6 to the outside of the ground tank 1. In this embodiment, the pipe 15 has a vent hole in the center of the embedded electrode 4 coaxially with the axial direction of the insulating cylinder 6, and extends the end of the vent hole to the outer periphery of the embedded electrode 4, and further supports the insulation. It penetrates the thickness of the object 3 and the flange portion of the ground tank 1 and communicates with the outside of the ground tank 1.

In the third embodiment , the conductive liquid or the conductive gel body 13 is injected into the insulating cylinder 6, but the insulating gas 5 can be sealed inside the insulating cylinder 6. Further, although the resistive material 14 is disposed on the inner surface of the insulating cylinder 6, the conductive material 7 can also be disposed.

In the third embodiment having the above-described configuration, it is possible to evacuate the gas section inside the insulating cylinder 6 after assembling the apparatus, and it is possible to enclose the insulating gas 5. For example, in the gas insulating apparatus as shown in FIG. 8 in which the conductive liquid or the conductive gel body 13 is injected into the insulating cylinder 6, the conductive liquid or the conductive gel body 13 is supplied through the pipe 15. Since injection | pouring can be performed easily, the injection | pouring operation | work of a conductive liquid or the electroconductive gel body 13 becomes possible easily.

  Therefore, when the resistive material 14 is arranged on the inner surface of the insulating cylinder as shown in FIG. 8, the temperature rise of the resistive material 14 during energization can be suppressed with a simple operation, and therefore the insulating cylinder 6 due to the temperature rise. It is also possible to suppress the deterioration. As a result, it is possible to provide a gas insulating device with good reliability.

Sectional drawing of the reference example of a gas insulation apparatus . Sectional drawing of the reference example of a gas insulation apparatus . Sectional drawing of the reference example of a gas insulation apparatus . Sectional drawing which shows the structure of 2nd Embodiment of this invention. Sectional drawing of the reference example of a gas insulation apparatus . Sectional drawing which shows the structure of 1st Embodiment of this invention. Sectional drawing of the reference example of a gas insulation apparatus . Sectional drawing which shows the structure of 3rd Embodiment of this invention. Sectional drawing which shows the structure of the conventional gas insulation apparatus.

DESCRIPTION OF SYMBOLS 1 ... Grounding tank 2 ... High voltage conductor 3 ... Support insulator 4 ... Embedded electrode 5 ... Insulating gas 6 ... Insulating cylinder 7 ... Conductive material 8 ... Metal conductor 9 ... Connection part 10 ... Metal expansion-contraction body 11 ... Ventilation path 12 ... Sealing material 13 ... conductive liquid or conductive gel body 14 ... resistive material 15 ... piping

Claims (7)

A high-voltage conductor, a ground tank for sealing the high-voltage conductor, and an insulating support for insulating support between the high-voltage conductor and the ground tank, and an embedded electrode is provided at the center of the insulating support. In a gas insulation device that is provided and further sealed with an insulating gas for maintaining insulation between the high voltage conductor and the ground tank,
The high voltage conductor is composed of an insulating tube which is disposed a conductive material on the inner surface, the is inserted the buried electrode in the end portion of the insulating tube, the conductive material of the embedded electrode and the insulating tube inner surface electrically Gas insulation, wherein a sealing material for gas classification is formed at a connection portion between the insulating cylinder and the embedded electrode, and a conductive liquid or a conductive gel body is injected inside the insulating cylinder machine.   The high-voltage conductor is composed of the insulating cylinder and a metal conductor inserted inside the insulating cylinder, and an end of the metal conductor is electrically and structurally connected to the embedded electrode of the insulating support. The gas insulation apparatus according to claim 1, wherein A high-voltage conductor, a ground tank for sealing the high-voltage conductor, and an insulating support for insulating support between the high-voltage conductor and the ground tank, and an embedded electrode is provided at the center of the insulating support. In a gas insulation device that is provided and further sealed with an insulating gas for maintaining insulation between the high voltage conductor and the ground tank,
The high-voltage conductor is composed of an insulating cylinder having an inner surface provided with a resistive material, and a metal conductor inserted inside the insulating cylinder, and the embedded electrode is inserted into an end of the insulating cylinder. The end portion of the metal conductor is electrically and structurally connected to the embedded electrode of the insulating support, and the gas cylinder sealing material is formed at the connecting portion between the insulating tube and the embedded electrode, A gas-insulated device in which a conductive liquid or a conductive gel is injected inside .   The gas insulation apparatus according to claim 2 or 3, wherein the metal conductor is a metal stretchable body that can be stretched in an axial direction. The gas insulation apparatus according to any one of claims 1 to 4 , wherein a ventilation path is formed in the insulating support and the embedded electrode to share a gas section inside and outside the insulating cylinder. The gas insulation apparatus according to any one of claims 1 to 5, wherein a pipe extending from the gas section inside the insulation cylinder to the outside of the ground tank is formed on the insulation support and the embedded electrode. . SF ₆ , N ₂ , O ₂ , dry air, CO ₂ , CF ₄ , c-C ₄ F ₈ , CCl ₂ , C ₂ F ₆ , C ₃ F ₈ or CF ₃ I as the insulating gas The gas insulation apparatus according to any one of claims 1 to 6, wherein a single gas or a mixed gas obtained by mixing any two or more of these gases is enclosed. .

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