JP2015191921A - Oil and gas spacer and oil-insulated apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil and gas spacer and an oil-insulated apparatus in which lowering of insulation performance is suppressed while ensuring the strength.SOLUTION: An oil and gas spacer 4 is used when connecting a gas-insulated bushing 3 to th upper part of a gas-insulated apparatus body and arranged, in projecting manner, on the insulating gas 34 side between a bushing tank 31 encapsulating the insulating gas 34 and an apparatus tank 21 encapsulating the insulating oil 23. The oil and gas spacer 4 includes an insulator 41 and an embedded conductor 42. The embedded conductor 42 consists of a bottomed cylindrical body opening to the insulating oil 23 side and having a bottom provided on the insulating gas 34 side, and the embedded conductor 42 is provided with at least a groove 12 interconnecting the inside and outside thereof via the outer peripheral surface thereof.

Description

  The present invention relates to an oil gas spacer and an oil insulating device.

  Oil-insulated equipment such as an oil-insulated transformer has a configuration in which a current-carrying part is arranged in a device tank filled with insulating oil.

  In addition, when a gas-insulated bushing is connected to the oil-insulated equipment, an oil-gas spacer that distinguishes between the insulating gas in the bushing and the insulating oil in the oil-insulated equipment is used.

  In recent years, a so-called polymer bushing in which the soot tube is made of a polymer has been put into practical use, and a combination of an oil gas spacer and a polymer bushing enables a lightweight and inexpensive bushing connection structure.

  Conventionally, when a bushing is attached to an upper part of an oil insulating device via an oil gas spacer, the oil gas spacer is disposed so as to protrude toward the insulating oil side. This is because if the oil gas spacer is convex on the insulating gas side, the dissolved gas of the insulating oil may be collected around the current-carrying portion by the oil gas spacer and the insulating performance may be reduced. On the other hand, when the oil gas spacer is convex on the insulating oil side, the dissolved gas is collected on the tank side by the oil gas spacer, so that it is possible to suppress a decrease in insulation performance.

  In Cited Document 1, a cone-shaped insulating spacer is arranged in an umbrella shape between an oil-filled transformer and a gas insulating device, a hollow through conductor is attached to the insulating spacer, and the side surface of the hollow through conductor on the transformer side A communication hole that communicates with the hollow portion is provided, and one end of the insulation pipe that communicates with the hollow portion is attached to the side surface of the hollow through conductor on the gas insulation device side, and the other end of this insulation pipe is drawn out of the duct of the gas insulation device Yes.

JP-A-62-252115

  However, in the general configuration in which the oil gas spacer is convex toward the insulating oil side, there is a concern about the creep strength of the oil gas spacer due to the differential pressure between the gas pressure and the hydraulic pressure. Further, in this configuration, foreign matter mixed in the bushing may be collected around the current-carrying portion by the oil / gas spacer and the dielectric strength may be reduced.

  Further, in Patent Document 1, the cone-shaped insulating spacer is arranged in an umbrella shape, but it is expected that it is difficult to ensure the withstand voltage performance of the insulating pipe.

  This invention is made | formed in view of the above, Comprising: It aims at providing the oil gas spacer and oil insulation apparatus with which the fall of insulation performance was suppressed and the intensity | strength was ensured.

  In order to solve the above-described problems and achieve the object, the oil / gas spacer according to the present invention is used when connecting a gas-insulated bushing to the upper part of the oil-insulated equipment body, and the bushing in which the insulating gas is sealed. In the insulator sandwiched between the end of the bushing tank and the end of the equipment tank, and arranged in a convex shape on the insulating gas side between the tank and the equipment tank filled with insulating oil An oil gas spacer that insulates and supports a device conductor in the oil insulated device body and a bushing conductor in the bushing connected to the device conductor via an embedded conductor embedded in the embedded conductor, It consists of a bottomed cylindrical body that opens on the oil side and has a bottom on the insulating gas side, and the embedded conductor includes at least the inner and outer sides of the embedded conductor via the outer peripheral surface of the embedded conductor. Groove communicating is provided.

  According to the present invention, there is an effect that it is possible to provide an oil / gas spacer in which deterioration of insulation performance is suppressed and strength is ensured, and an oil insulation device including the oil / gas spacer.

FIG. 1 is a longitudinal sectional view showing the configuration of the oil-insulated device according to the first embodiment. FIG. 2 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer according to the first embodiment. FIG. 3 is a plan view of the buried conductor. FIG. 4 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer according to the second embodiment. FIG. 5 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer according to the third embodiment. FIG. 6 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer according to the fourth embodiment. FIG. 7 shows the details of the discharge device. FIG. 8 is a longitudinal sectional view showing the configuration of the oil insulating device according to the fifth embodiment. FIG. 9 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer according to the fifth embodiment. FIG. 10 is a longitudinal sectional view showing a configuration of a conventional oil insulated device.

  Embodiments of an oil gas spacer and an oil insulation device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing a configuration of an oil insulating device 1 according to the present embodiment. As shown in FIG. 1, the oil insulating device 1 includes an oil insulating device main body 2, a bushing 3 connected to an upper portion of the oil insulating device main body 2, and oil interposed between the oil insulating device main body 2 and the bushing 3. Gas spacer 4 is provided.

  The oil-insulated device main body 2 is configured by housing a device conductor 22 which is a current-carrying part in a device tank 21 in which insulating oil 23 is sealed. The equipment tank 21 is a grounded cylindrical metal tank. The oil insulation apparatus main body 2 is an oil insulation transformer, for example.

  The bushing 3 is a gas bushing that is gas-insulated. The bushing 3 includes a bushing tank 31 connected to the equipment tank 21 through the oil gas spacer 4, a soot pipe 32 connected to the bushing tank 31, and a bushing conductor that is an energizing portion extending in the bushing tank 31 and the soot pipe 32. 33. Insulating gas 34 such as sulfur hexafluoride gas is enclosed in bushing tank 31 and soot tube 32. The soot tube 32 is, for example, a polymer soot tube. The bushing 3 can be reduced in weight by forming the soot tube 32 with a polymer. The bushing tank 31 is a grounded cylindrical metal tank.

  The oil gas spacer 4 is disposed in a convex shape on the insulating gas 34 side, and an insulator 41 having a peripheral portion sandwiched between an end portion of the bushing tank 31 and an end portion of the equipment tank 21, and a central portion of the insulator 41. Embedded conductor 42 and a shield 43 attached to the buried conductor 42. The insulator 41 has such a shape that the diameter is reduced toward the bushing 3 side. The device conductor 22 and the bushing conductor 33 are connected via the embedded conductor 42 and are insulated and supported by the oil gas spacer 4 via the embedded conductor 42. The shield 43 is an electric field relaxation shield that extends from the embedded conductor 42 to both the bushing 3 side and the oil-insulated equipment main body 2 side, and covers the end of the bushing conductor 33 and the end of the equipment conductor 22. The oil gas spacer 4 divides the inside of the oil insulating device main body 2 and the inside of the bushing 3, and partitions the insulating oil 23 in the oil insulating device main body 2 and the insulating gas 34 in the bushing 3 in an oil-tight manner.

  FIG. 2 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer 4 according to the present embodiment, and FIG. 3 is a plan view of the embedded conductor 42. In FIG. 2, the shield 43 on the insulating gas 34 side is omitted. FIG. 3 is a view of the buried conductor 42 as viewed from below.

  The buried conductor 42 is made of a metal bottomed cylindrical body having an opening on the insulating oil 23 side and a bottom provided on the insulating gas 34 side. That is, the embedded conductor 42 is provided with the internal space 11 that opens to the insulating oil 23 side. As will be described later, the internal space 11 is used as a gas reservoir.

  Further, the buried conductor 42 is provided with a groove 12 on the end face on the insulating oil 23 side to communicate the inside and outside of the buried conductor 42. The groove 12 communicates with the inside and outside of the buried conductor 42 through at least the outer peripheral surface of the buried conductor 42. Here, the end surface of the embedded conductor 42 on the insulating oil 23 side protrudes closer to the insulating oil 23 than the inner peripheral surface of the insulator 41 in contact with the outer peripheral surface of the embedded conductor 42. Therefore, the groove 12 is formed so that the insulating oil 23 can be guided into and out of the embedded conductor 42 through at least the outer peripheral surface of the embedded conductor 42.

  The groove 12 communicates, for example, in the radial direction with respect to the embedded conductor 42. Moreover, the groove | channel 12 can be provided with two or more, for example. In the illustrated example, four grooves 12 are provided at equiangular intervals in the circumferential direction.

  The depth of the groove 12 increases, for example, as it goes radially inward (FIG. 2). That is, the groove 12 is shallowest on the outer peripheral surface of the embedded conductor 42 and becomes deeper toward the inside in the radial direction. As described above, the end surface of the embedded conductor 42 on the insulating oil 23 side protrudes to the insulating oil 23 side from the inner peripheral surface of the insulator 41, but this protruding length is the length of the groove 12 on the outer peripheral surface of the embedded conductor 42. The depth is preferable.

  In addition, although illustration is abbreviate | omitted, the edge part of the bushing conductor 33 is inserted in the contact (not shown) attached to the outer bottom face of the embedded conductor 42, for example. Further, the end portion of the device conductor 22 is fastened to, for example, an L-type terminal (not shown) attached to the end surface of the embedded conductor 42 on the insulating oil 23 side. Although at least a part of the opening of the embedded conductor 42 is closed by the L-type terminal, the opening of the groove 12 on the outer peripheral surface of the embedded conductor 42 is not blocked. Yes.

  The effect by providing the oil gas spacer 4 is as follows. Since the oil gas spacer 4 has a convex shape on the insulating gas 34 side, the dissolved gas bubbles 45 of the insulating oil 23 move to the embedded conductor 42 side along the oil gas spacer 4, and the bubbles 45 are outside the embedded conductor 42. From the surface, it is guided to the internal space 11 of the buried conductor 42 through the groove 12 provided in the buried conductor 42. The dissolved gas is a decomposition gas of the insulating oil 23, for example.

  Generally, the vicinity of the connection portion between the device conductor 22 and the oil / gas spacer 4 has a high electric field, and the air bubbles 45 accumulate in the vicinity of the connection portion, so that the insulation performance may be deteriorated. In the present embodiment, the groove 12 is provided in the buried conductor 42, and the bubbles 45 are guided to the internal space 11 (gas reservoir) of the buried conductor 42 through the groove 12, thereby making the dissolved gas harmless in terms of insulation performance. And the deterioration of the insulation performance due to the dissolved gas is suppressed.

  Further, by making the oil gas spacer 4 convex toward the insulating gas 34 side, the creep strength is also ensured.

  As described above, according to the present embodiment, the bushing 31 and the insulating oil 23 in which the insulating gas 34 is sealed are used when the gas-insulated bushing 3 is connected to the upper portion of the oil-insulated equipment body 2. And is embedded in an insulator 41 sandwiched between the end of the bushing tank 31 and the end of the equipment tank 21. An oil gas spacer 4 that insulates and supports the device conductor 22 and the bushing conductor 33 via the embedded conductor 42, and the embedded conductor 42 is open on the insulating oil 23 side and has a bottom on the insulating gas 34 side. Since the embedded conductor 42 is provided with the groove 12 that communicates the inside and outside of the embedded conductor 42 through at least the outer peripheral surface of the embedded conductor 42, the embedded conductor 42 is used. Reduction in performance is suppressed, the strength is ensured.

  Further, in the present embodiment, since the groove 12 communicates the inside and outside of the embedded conductor 42 in the radial direction, the bubbles 45 can be easily guided to the internal space 11 (gas reservoir).

  Further, in the present embodiment, the depth of the groove 12 is increased toward the inner side in the radial direction, so that the bubbles 45 can be easily guided to the internal space 11 (gas reservoir).

  FIG. 10 is a longitudinal sectional view showing a configuration of a conventional oil insulating device 100. 10, the same components as those in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 10, the oil gas spacer 80 includes an insulator 81 that is convexly disposed on the insulating oil 23 side and has a peripheral portion sandwiched between the end of the bushing tank 31 and the end of the equipment tank 21. The embedded conductor 82 is embedded in the center of the insulator 81, and the shield 83 is attached to the embedded conductor 82.

  Since this conventional oil / gas spacer 80 is convex toward the insulating oil 23, there is a concern about the creep strength due to the differential pressure between the gas pressure and the hydraulic pressure. Further, in this configuration, foreign matter mixed in the bushing 3 may be collected around the bushing conductor 33 by the oil / gas spacer 80 and the dielectric strength may be reduced.

Embodiment 2. FIG.
FIG. 4 is a longitudinal sectional view showing a configuration of a main part of the oil gas spacer 4 according to the present embodiment, and corresponds to FIG. In FIG. 4, the same components as those in FIG. 2 are denoted by the same reference numerals. Other configurations of the present embodiment are the same as those of the first embodiment.

  As shown in FIG. 4, in the present embodiment, the buried conductor 42 is provided with a gas vent hole 13 that penetrates the bottom of the buried conductor 42 and a lid 14 that closes the gas vent hole 13. The gas vent hole 13 communicates with the internal space 11.

  According to the present embodiment, the dissolved gas accumulated in the internal space 11 that is the gas reservoir can be recovered by removing the lid 14 after removing the bushing 3, so that it is insulated from the oil insulation device main body 2. The dissolved gas can be recovered without removing the oil 23. Other effects of the present embodiment are the same as those of the first embodiment.

Embodiment 3 FIG.
FIG. 5 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer 4 according to the present embodiment, and corresponds to FIG. 2. In FIG. 5, the same components as those in FIG. 2 are denoted by the same reference numerals. Other configurations of the present embodiment are the same as those of the first embodiment.

  As shown in FIG. 5, in the present embodiment, the buried conductor 42 includes a gas vent hole 13 that penetrates the bottom of the buried conductor 42, a lid 14 that closes the gas vent hole 13, and an internal space 11 of the buried conductor 42. There are provided an observation window 15 through which the dissolved gas accumulated in the window can be visually observed, and a holding plate 16 for pressing and fixing the observation window 15 from the bushing 3 side. The gas vent hole 13 communicates with the internal space 11. The observation window 15 is made of a transparent material such as glass or acrylic.

  According to the present embodiment, it is possible to visually check whether or not the dissolved gas is actually accumulated before removing the lid 14 and collecting the dissolved gas accumulated in the internal space 11 that is a gas reservoir. Therefore, it is possible to prevent the gas vent hole 13 from being inadvertently opened. Other effects of the present embodiment are the same as those of the second embodiment.

Embodiment 4 FIG.
FIG. 6 is a longitudinal sectional view showing a configuration of a main part of the oil gas spacer 4 according to the present embodiment, and corresponds to FIG. FIG. 7 is a diagram showing details of the discharge device 17, (a) shows a configuration at the time of gas discharge, and (b) shows a configuration before the gas discharge. 6 and 7, the same components as those in FIG. 2 are denoted by the same reference numerals. Other configurations of the present embodiment are the same as those of the first embodiment.

  As shown in FIG. 6, in the present embodiment, the discharge device 17 capable of releasing the dissolved gas accumulated in the internal space 11 of the embedded conductor 42 and the dissolved material accumulated in the internal space 11 of the embedded conductor 42 in the embedded conductor 42. A viewing window 15 through which gas can be visually observed, and a presser plate 16 for pressing and fixing the viewing window 15 from the bushing 3 side are provided. The observation window 15 is made of a transparent material such as glass or acrylic.

  As shown in FIG. 7, the discharge device 17 includes a piston-like columnar body 50 that is fitted in a cylindrical through-hole penetrating the bottom of the embedded conductor 42 so as to be airtight and turnable about an axis. The column 50 is in contact with the outer bottom surface of the embedded conductor 42 with an outer diameter larger than that of the columnar shaft portion fitted in the through hole so as to be airtight and rotatable about the axis. And a head for closing. Further, a packing 55 is disposed on the outer periphery of the shaft portion of the column 50 so that the dissolved gas accumulated in the internal space 11 does not leak outside through the gap between the shaft portion and the through hole.

  Further, the column body 50 is formed with a gas discharge path 51a extending from an end surface facing the internal space 11 to the outer peripheral surface.

  The embedded conductor 42 has a recess 52 formed on the outer bottom surface, and a gas discharge path 51b extending from the recess 52 to the inner peripheral surface of the through hole.

  Further, the axial position of the gas discharge path 51a on the outer peripheral surface of the column 50 is equal to the axial position of the gas discharge path 51b on the inner peripheral surface of the through hole. Here, the axial direction is the direction of the axis of the columnar body 50. Therefore, by rotating the column body 50 about the axis and adjusting the position around the axis, the gas release path 51a and the gas release path 51b can be connected or disconnected.

  In FIG. 7B, the gas discharge path 51a and the gas discharge path 51b are not in communication, and a lid 53 is disposed in the recess 52 to block the gas discharge path 51b. Instead of providing the recess 52, the gas discharge path 51b may be formed from the outer bottom surface to the inner peripheral surface of the through hole, and the lid 53 may be placed on the outer bottom surface to close the gas discharge path 51b. .

  In FIG. 7A, the gas discharge path 51a and the gas discharge path 51b are in communication with each other, the lid 53 is removed from the recess 52, and the dissolved gas in the internal space 11 passes through the gas discharge paths 51a and 51b. It is in a recoverable state.

  Thus, the discharge device 17 releases the dissolved gas accumulated in the internal space 11 by adjusting the position around the axis of the column 50 and connecting the gas release path 51a and the gas release path 51b. When the gas release path 51a and the gas release path 51b are not connected, the dissolved gas accumulated in the internal space 11 is not released.

  According to the present embodiment, using the discharge device 17 makes it easier to collect dissolved gas. Other effects of the present embodiment are the same as those of the third embodiment.

Embodiment 5 FIG.
FIG. 8 is a longitudinal sectional view showing a configuration of the oil insulating device 1 according to the present embodiment. FIG. 9 is a longitudinal sectional view showing a configuration of a main part of the oil / gas spacer 4 according to the present embodiment.

  As shown in FIG. 8, the device tank 21 of the oil-insulated device main body 2 is provided with a viewing window 60 through which the shield 43 can be visually recognized.

  Further, as shown in FIG. 9, a floating 65 is disposed in the internal space 11 of the embedded conductor 42, and a rod 66 a extending in the vertical direction is connected to the floating 65. The weight of the rod 66a is adjusted so that the float 65 can float on the oil surface. Further, the rod 66a is inserted through an annular guide 66b and is allowed to move only in the vertical direction. The guide 66b is fixed inside the shield 43. The guide 66b restricts the movement of the rod 66a in the vertical direction.

  FIG. 9A shows a case where the dissolved gas 61 remaining in the internal space 11 is small. In this state, the lower end portion of the rod 66 a is hidden in the shield 43 and cannot be viewed through the observation window 60.

  FIG. 9B shows the case where the dissolved gas 61 accumulated in the internal space 11 is large. In this state, the oil level of the insulating oil 23 is lower than that in the case of FIG. 9A, and the lower end portion of the rod 66 a appears outside the shield 43 and is visible through the observation window 60. ing. FIG. 9B shows that the lower end portion of the rod 66a that is visible from the observation window 60 becomes an indicator portion 70 for detecting dissolved gas.

  In other words, in the present embodiment, when a certain amount or more of dissolved gas accumulates in the embedded conductor 42, the lower end portion of the rod 66a appears from the shield 43, so that the embedded conductor 42 is visually recognized from the observation window 60. It is possible to detect that a certain amount or more of dissolved gas is accumulated in the interior of the.

  Other configurations of the present embodiment are the same as those of the fourth embodiment except that the observation window 15 and the presser plate 16 are not provided. Note that the observation window 15 and the holding plate 16 can be provided on the embedded conductor 42 of the present embodiment.

  According to the present embodiment, it is possible to determine whether dissolved gas is accumulated in the embedded conductor 42 without removing the bushing 3. Other effects of the present embodiment are the same as those of the second embodiment.

  The present invention is useful as an oil gas spacer and an oil insulation device.

  1,100 Oil insulation device, 2 Oil insulation device body, 3 Bushing, 4,80 Oil gas spacer, 11 Internal space, 12 Groove, 13 Gas vent hole, 14 Lid, 15 Peep window, 16 Press plate, 17 Release device, 21 equipment tank, 22 equipment conductor, 23 insulating oil, 31 bushing tank, 32 soot pipe, 33 bushing conductor, 34 insulating gas, 41, 81 insulator, 42, 82 embedded conductor, 43, 83 shield, 45 bubbles, 50 pillar 51a, 51b Gas discharge path, 52 concave portion, 53 lid, 55 packing, 60 viewing window, 61 dissolved gas, 65 float, 66a rod, 66b guide, 67 connecting portion, 70 indicator portion.

Claims (8)

Used when connecting a gas-insulated bushing to the upper part of the oil-insulated equipment body, and is arranged in a convex shape on the insulating gas side between the bushing tank filled with insulating gas and the equipment tank filled with insulating oil In addition, the device conductor in the oil-insulated device body and the device conductor are connected via an embedded conductor embedded in an insulator sandwiched between the end of the bushing tank and the end of the device tank. An oil gas spacer for insulatingly supporting a bushing conductor in the bushing to be connected;
The embedded conductor is composed of a bottomed cylindrical body having an opening on the insulating oil side and a bottom provided on the insulating gas side,
An oil gas spacer, wherein the embedded conductor is provided with a groove communicating with the inside and outside of the embedded conductor through at least the outer peripheral surface of the embedded conductor.   The oil / gas spacer according to claim 1, wherein the groove communicates the inside and outside of the embedded conductor in a radial direction.   3. The oil / gas spacer according to claim 1, wherein a depth of the groove increases toward a radially inner side. 4.   The said embedded conductor is provided with the degassing hole which penetrates the bottom of the said embedded conductor, and the lid | cover which obstruct | occludes this degassing hole, The one of Claim 1 to 3 characterized by the above-mentioned. Oil gas spacer. The buried conductor is provided with a gas releasing device capable of releasing the gas accumulated in the buried conductor,
The gas discharge device includes a piston-like column body fitted in a through hole penetrating the bottom of the embedded conductor in an airtight manner so as to be rotatable about an axis,
The column body is formed with a first gas discharge path extending from an end surface facing the inside of the embedded conductor to the outer peripheral surface,
The buried conductor is formed with a second gas discharge path extending from the outer bottom surface to the inner peripheral surface of the through hole,
The position around the axis of the column body is adjusted, and the gas accumulated in the buried conductor can be released by communicating the first gas discharge path and the second gas discharge path. The oil / gas spacer according to any one of claims 1 to 3.   The oil / gas spacer according to claim 4 or 5, wherein the buried conductor is provided with a viewing window through which gas accumulated in the buried conductor can be visually observed.   An oil insulating device comprising the oil gas spacer according to claim 1, the bushing, and the oil insulating device main body. A shield attached to the embedded conductor;
A float disposed inside the buried conductor;
A vertically extending rod connected to this float;
A viewing window provided in the equipment tank and capable of visually recognizing the shield;
With
When a certain amount or more of gas accumulates inside the embedded conductor, the bottom end of the rod appears from the shield through a viewing window provided in the equipment tank, so that the inside of the embedded conductor The oil insulation apparatus according to claim 7, wherein it is possible to detect that a certain amount or more of gas is accumulated in the oil insulation.

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