JP2013059213A - Connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a connection device which prevents the destruction of spacers and thereby inhibiting the occurence of an accident and inhibits the accident from affecting a gas insulation opening/closing apparatus when the accident occurs.SOLUTION: A connection device 3 connects a gas insulation opening/closing apparatus 1 with a transformer 2 and includes: a first tank 4 forming a first intermediate chamber 5 located adjacent to the gas insulation opening/closing apparatus; a second tank 6 forming a second intermediate chamber 7 located between the first intermediate chamber and the transformer; a first spacer 11 separating the gas insulation opening/closing apparatus from the first intermediate chamber; a second spacer 12 separating the first intermediate chamber from the second intermediate chamber; a third spacer 13 separating the second intermediate chamber from the transformer; and tank inner conductors 8, 14 which are provided in the first tank and the second tank and penetrate through the first to third spacers to electrically connect a conductor of the gas insulation opening/closing apparatus with a conductor of the transformer. The first to third spacers present protruding shapes toward the gas insulation opening/closing apparatus side.

Description

  The present invention relates to a connection device for connecting a gas insulated switchgear and a transformer.

  2. Description of the Related Art Conventionally, a connection device that connects and directly connects a gas insulated switchgear and a transformer has been used. The connection device includes a connection conductor for electrically connecting a conductor on the gas-insulated switchgear side and a conductor on the transformer side, and a tank in which an intermediate chamber for accommodating the connection conductor is formed. The intermediate chamber is filled with an insulating gas or oil in order to ensure insulating performance.

  For example, Patent Document 1 discloses a configuration in which a transformer filled with oil and a gas insulated switchgear filled with insulating gas are connected to a connecting device filled with oil inside the tank. Has been.

Japanese Utility Model Publication No.59-141429

  However, according to the above conventional technique, when a ground fault or the like occurs and the pressure in the intermediate chamber rises, the spacer that partitions the intermediate chamber and the gas-insulated switchgear may be destroyed. . Then, when the spacer is broken, there is a problem that oil flows into the gas insulated switchgear and the influence of the accident spreads to the gas insulated switchgear.

  The present invention has been made in view of the above, and suppresses the occurrence of an accident by suppressing the breakage of the spacer, and suppresses the influence of the accident on the gas-insulated switchgear when an accident occurs. It is an object of the present invention to obtain a connection device that can do the above.

  In order to solve the above-described problems and achieve the object, the present invention provides a connection device for connecting a gas-insulated switchgear and a transformer, and forms a first intermediate chamber adjacent to the gas-insulated switchgear. A first tank, a second tank that forms a second intermediate chamber between the first intermediate chamber and the transformer, a first spacer that partitions the gas insulated switchgear and the first intermediate chamber, a first intermediate chamber, A second spacer that partitions the second intermediate chamber, a third spacer that partitions the second intermediate chamber and the transformer, and the first spacer and the second tank that pass through the first to third spacers. And a conductor in the tank that electrically connects the conductor of the gas insulated switchgear and the conductor of the transformer, and the first to third spacers have a shape that protrudes toward the gas insulated switchgear. And

  According to the present invention, by providing the first intermediate chamber and the second intermediate chamber between the gas-insulated switchgear and the transformer, it is possible to prevent the influence of the accident from spreading to the gas-insulated switchgear. Further, since the spacer has a convex shape toward the gas insulated switchgear, the contact pressure between the spacer and the in-tank conductor can be increased to improve the reliability of the connecting device. Further, the strength of the spacer can be improved by pressurization from the gas insulated switchgear side, and the breakage of the spacer can be suppressed.

FIG. 1 is a cross-sectional view illustrating an internal configuration of a connection portion including a connection device according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining the optimum dimensions of the inner diameter of the tank when the pressure in the tank in oil insulation is atmospheric pressure and when the gas pressure in the tank in gas insulation is 0.5 Mpa. It is a figure which shows the relationship between the internal diameter of a tank, and a conductor diameter. FIG. 3 is a diagram for explaining the optimum dimension of the inner diameter of the tank when the pressure in the oil insulation is the atmospheric pressure in the tank and when the gas pressure in the tank in the gas insulation is 0.3 Mpa. It is a figure which shows the relationship between the internal diameter of a tank, and a conductor diameter. FIG. 4 is a cross-sectional view illustrating an internal configuration of a connection portion including the connection device according to the second embodiment of the present invention. FIG. 5 is a partially enlarged view in which the portion A shown in FIG. 4 is enlarged. FIG. 6: is sectional drawing which shows the internal structure of the connection part containing the connection apparatus concerning Embodiment 3 of this invention. 7 is a cross-sectional view taken along the line BB shown in FIG. FIG. 8 is a front view of the plate. FIG. 9: is sectional drawing which shows the internal structure of the connection part containing the connection apparatus concerning Embodiment 4 of this invention. FIG. 10 is a cross-sectional view taken along the line CC shown in FIG. FIG. 11 is a front view of the spacer.

  Hereinafter, a connection device according to an embodiment of the present invention will be described 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 cross-sectional view illustrating an internal configuration of a connection portion including a connection device according to a first embodiment of the present invention. As shown in FIG. 1, the connection device 3 connects the conductor of the gas insulated switchgear 1 and the conductor of the transformer 2.

In the gas-insulated switchgear 1, a conductor is accommodated in a cylindrical sealed tank, and an insulating gas such as SF ₆ gas is sealed in the sealed tank. The pressure in the closed tank of the gas insulated switchgear 1 is set in the range of 0.3 MPa to 0.5 MPa, for example. Detailed description of the configuration and operation of the gas insulated switchgear 1 will be omitted.

  The transformer 2 has a conductor housed in a cylindrical sealed tank. The transformer 2 is an oil insulated transformer in which oil is filled in a sealed tank. The pressure in the sealed tank of the transformer 2 is set to, for example, substantially the same pressure as the atmospheric pressure. Detailed description of the configuration and operation of the transformer 2 is omitted.

  The connection device 3 includes a first tank 4, a second tank 6, a connection conductor 8, a first spacer 11, a second spacer 12, and a third spacer 13. The first tank 4 has a cylindrical shape and is disposed adjacent to the gas insulated switchgear 1. The second tank 6 has a cylindrical shape and is disposed between the first tank 4 and the transformer 2. The second tank 6 has a structure that satisfies the second type pressure vessel structure standard according to the Industrial Safety and Health Act.

  The first spacer 11 is provided between the first tank 4 and the closed tank of the gas insulated switchgear 1 and partitions the internal space of the first tank 4 from the internal space of the closed tank of the gas insulated switchgear 1. The second spacer 12 is provided between the first tank 4 and the second tank 6 and partitions the internal space of the first tank 4 and the internal space of the second tank 6. The third spacer 13 is provided between the second tank 6 and the sealed tank of the transformer 2, and partitions between the internal space of the second tank 6 and the sealed tank of the transformer 2.

  In the connection device 3, a first intermediate chamber 5 surrounded by the first tank 4, the first spacer 11, and the second spacer 12 is formed. Further, a second intermediate chamber 7 surrounded by the second tank 6, the second spacer 12, and the third spacer 13 is formed. That is, two intermediate chambers 5 and 7 are formed between the gas insulated switchgear 1 and the transformer 2.

  The spacers 11, 12, and 13 are insulating spacers made of a cast insulator. The spacers 11, 12, and 13 have a conical shape and are disposed so as to protrude toward the gas insulated switchgear 1 side. The spacers 11, 12, and 13 are formed with openings 11 a, 12 a, and 13 a at the center thereof. A metal conductor (embedded conductor 14) is embedded in each of the openings 11a, 12a, and 13a.

  The embedded conductor 14 is embedded in the openings 11a, 12a, and 13a by arranging the spacers 11, 12, and 13 at positions where the openings 11a, 12a, and 13a are formed when the spacers 11, 12, and 13 are resin-molded. As a result, the buried conductor 14 and the spacers 11, 12, and 13 can be more reliably brought into close contact with each other.

  The embedded conductor 14 embedded in the first spacer 11 is electrically connected to the conductor of the gas insulated switchgear 1 by the socket 9. The embedded conductor 14 embedded in the third spacer 13 is connected to the conductor of the transformer 2 by the socket 9. In the first intermediate chamber 5 and the second intermediate chamber 7, the embedded conductors 14 are electrically connected via the connection conductor 8. The connection conductor 8 and the buried conductor 14 are connected by a socket 9. Thus, the conductor of the gas insulated switchgear 1 and the conductor of the transformer 2 are electrically connected via the connection conductor 8 and the embedded conductor 14. In the following description, the connecting conductor 8 and the embedded conductor 14 are also collectively referred to as an in-tank conductor.

The first intermediate chamber 5 is filled with an insulating gas such as SF ₆ gas as in the sealed tank of the gas insulated switchgear 1. The pressure in the first intermediate chamber 5 is set, for example, in the range of 0.3 MPa to 0.5 MPa. The second intermediate chamber 7 is filled with oil in the same manner as in the sealed tank of the transformer 2. The pressure in the second intermediate chamber 7 is set to, for example, substantially the same pressure as atmospheric pressure.

  Next, the relationship between the inner diameter d1 of the first tank 4 and the second tank 6 and the inner diameter d2 of the sealed tank of the gas insulated switchgear 1 will be described. FIG. 2 is a diagram for explaining the optimum dimensions of the inner diameter of the tank when the pressure in the tank in oil insulation is atmospheric pressure and when the gas pressure in the tank in gas insulation is 0.5 Mpa. It is a figure which shows the relationship between the internal diameter of a tank, and a conductor diameter. FIG. 3 is a diagram for explaining the optimum dimension of the inner diameter of the tank when the pressure in the tank in oil insulation is atmospheric pressure and when the gas pressure in the tank in gas insulation is 0.3 Mpa. It is a figure which shows the relationship between the internal diameter of a tank, and a conductor diameter.

  The line segment s1 in FIG. 2 and FIG. 3 shows the inner diameter of the tank and the conductor diameter that can be kept within the allowable electric field when the oil is filled in the interior as in the second tank 6 to perform oil insulation. Showing the relationship. If the inner diameter and the conductor diameter of the tank are selected in the range above the line segment s1, the allowable electric field can be prevented from exceeding.

  The line segment s1 shows the case where the pressure in the tank filled with oil is atmospheric pressure, and there is no difference between FIG. 2 and FIG. Here, as the inner diameter of the tank is reduced, the manufacturing cost is more easily suppressed. Therefore, in a tank filled with oil, the point indicated by P1 indicates the optimum inner diameter in terms of cost. That is, in the second tank 6 filled with oil, the inner diameter d1 is preferably set to a value indicated by P1.

  The line segment t1 in FIG. 2 and the line segment t2 in FIG. 3 are tanks that can be kept within the allowable electric field when gas insulation is performed by enclosing an insulating gas as in the gas-insulated switchgear 1. The relationship between the inner diameter and the conductor diameter is shown. Line segments u1 and u2 indicate the relationship between the inner diameter of the tank and the conductor diameter that can suppress the temperature of the tank filled with the insulating gas to the temperature determined by the standard.

  For the line segments t1 and u1 shown in FIG. 2, the gas pressure in the tank is 0.5 MPa. Moreover, about the line segments t2 and u2 shown in FIG. 3, the case where the gas pressure in a tank is 0.3 Mpa is shown. In FIG. 2, if the inner diameter and the conductor diameter of the tank are selected in the range above the line segment t1 and above the line segment u1, it is possible to prevent the allowable electric field and allowable temperature from being exceeded. In FIG. 3, if the tank inner diameter and the conductor diameter are selected in the range above the line segment t2 and above the line segment u2, the allowable electric field and allowable temperature can be prevented from being exceeded.

  As described above, the smaller the tank inner diameter is, the easier it is to reduce the manufacturing cost. Therefore, in a tank filled with an insulating gas, the point indicated by Q1 if the gas pressure is 0.5 MPa is the optimum inner diameter in terms of cost. Will be shown. If the gas pressure is 0.3 MPa, the point indicated by Q2 indicates the optimum inner diameter in terms of cost. That is, in the closed tank of the gas insulated switchgear 1 filled with the insulating gas, the inner diameter d2 is set to a value indicated by Q1 if the gas pressure is 0.5 MPa, and to a value indicated by Q2 if the gas pressure is 0.3 MPa. Is preferably set.

  Here, in FIG. 2, the ratio of the inner diameter at P1 to the inner diameter at Q1, that is, d1 / d2 is about 2.0. In FIG. 3, the ratio of the inner diameter at P1 to the inner diameter at Q2, that is, d1 / d2 is about 1.4. Therefore, when the pressure in the gas insulated switchgear 1 or the first intermediate chamber 5 is set in the range of 0.3 MPa to 0.5 MPa, the inner diameter d1 of the second tank 6 and the sealed tank of the gas insulated switchgear 1 are By making the inner diameter d2 satisfy the relationship of 1.4 ≦ d1 / d2 ≦ 2.0, the manufacturing cost of the connection device 3 can be suppressed. The inner diameter of the first tank 4 is set to the same diameter (d1) as the inner diameter of the second tank 6.

  As described above, the connection device 3 includes the two intermediate chambers 5 and 7 between the gas insulated switchgear 1 and the transformer 2. Therefore, even when a ground fault occurs, the pressure in the second intermediate chamber 7 increases, and the oil in the second tank 6 flows into the first intermediate chamber 5 even when the second spacer 12 is destroyed. Since it flows in, oil can be prevented from flowing into the gas insulated switchgear 1. That is, the influence of the accident can be prevented from spreading to the gas insulated switchgear 1.

  Further, since the second tank 6 has a structure satisfying the second type pressure vessel structure standard, the second tank 6 is not easily destroyed when the pressure in the second intermediate chamber 7 rises. Since the second tank 6 is less likely to be destroyed, the second spacer 12 is more easily destroyed when the pressure is increased. However, even if the second spacer 12 is destroyed, as described above, the gas insulation is performed. Since it is possible to prevent the influence of the accident from spreading to the switchgear 1, it is possible to minimize the influence of the accident for the entire joint.

  Moreover, since the spacers 11, 12, and 13 are provided so that the gas insulated switchgear 1 side is convex, it is possible to improve the strength against pressure from the gas insulated switchgear 1 side. The internal pressure of the gas insulated switchgear 1 and the first intermediate chamber 5 in which the insulating gas is sealed is set to 0.3 MPa to 0.5 MPa. On the other hand, in the second intermediate chamber 7 and the transformer 2 filled with oil, the internal pressure is set substantially equal to the atmospheric pressure.

  That is, in the connection part including the connection device 3, the pressure from the gas insulated switchgear 1 side is larger than the pressure from the transformer 2 side. Therefore, it is possible to prevent the spacers 11, 12, and 13 from being broken by pressure by improving the strength against pressurization from the gas insulated switchgear 1 side.

  Further, when the pressure in the convex space is higher than the pressure in the concave space as in the second spacer 12, the opening 12a portion of the second spacer 12 is placed on the buried conductor 14 side by the pressure in the convex space. The contact pressure between the two increases. Therefore, it is possible to make it difficult for the insulating gas and oil to leak from between the opening 12a and the buried conductor 14. If the insulating gas dissolves in the oil, the insulating performance of the oil may deteriorate. Therefore, the reliability of the connection device 3 can be improved by making it difficult for the insulating gas and oil to leak from between the opening 12a and the embedded conductor 14.

  It should be noted that an insulating gas may be enclosed in the sealed tank and the second tank 6 of the transformer 2 instead of oil to constitute a connecting portion using a gas insulating transformer.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view illustrating an internal configuration of a connection portion including the connection device according to the second embodiment of the present invention. FIG. 5 is a partially enlarged view in which the portion A shown in FIG. 4 is enlarged. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the connection device 50 according to the second embodiment, the connection conductor 8 is divided into a switching device side conductor 8a and a transformer side conductor 8b in the first tank 4. And as shown in FIG. 5, the attachment / detachment connection part 15 is provided between the switchgear side conductor 8a and the transformer side conductor 8b.

  The detachable connection portion 15 is formed with a bolt hole 15 a and is fixed to the switchgear-side conductor 8 a and the transformer-side conductor 8 b by a bolt 19. The detachable connection part 15 is configured using metal or the like, and the switchgear-side conductor 8a and the transformer-side conductor 8b are electrically connected via the detachable connection part 15.

  Moreover, the 1st tank 4 can be divided | segmented into the switching device side 1st tank 4a and the transformer side 1st tank 4b. A gap between the switchgear-side first tank 4a and the transformer-side first tank 4b is sealed with a bolt or the like (not shown).

  The opening / closing device side first tank 4 a is provided with a hand hole 16 that allows a hand or the like to be inserted into the first intermediate chamber 5. The hand hole 16 is closed with a lid 17 that is detachably provided. The transformer-side first tank 4 b is provided with a bellows (expandable part) 18, and the transformer-side first tank 4 b can be expanded and contracted substantially parallel to the extending direction of the connection conductor 8.

  In the connection device 50 configured as described above, disassembly of the connection device 50 is facilitated. When the detachable connection portion 15 is not provided as in the first embodiment, the connection conductor 8 in the first tank 4 is fitted between the sockets 9, so that the gas insulated switchgear 1 side is provided. Cannot be moved to the transformer 2 side and is difficult to remove. Therefore, the first conductor 4 cannot be removed due to the connection conductor 8 being in the way.

  On the other hand, in the second embodiment, the connection conductor 8 can be moved by inserting a hand or the like into the first intermediate chamber 5 through the hand hole 16 and removing the detachable connection portion 15. Specifically, the switchgear-side conductor 8a can be moved to the transformer 2 side and extracted from the socket 9, and the transformer-side conductor 8b is moved to the gas insulated switchgear 1 side and extracted from the socket 9. Will be able to. Accordingly, since the connection conductor 8 can be removed in advance, the first tank 4 can be extracted.

  Further, in the first tank 4 that is not divided as shown in the first embodiment, the convex portion of the second spacer 12 that protrudes toward the first intermediate chamber 5 gets in the way, and the first tank 4 is removed. Is difficult.

  On the other hand, in the second embodiment, since the first tank 4 can be divided, the opening / closing device side first tank 4a can be extracted without being obstructed by the convex portion of the second spacer 12. Furthermore, since the bellows 18 is provided, the transformer-side first tank 4b can be contracted, so that the switchgear-side first tank 4a can be extracted more easily.

  In the second embodiment, the hand hole 16 is provided in the switching device side first tank 4a and the bellows 18 is provided in the transformer side first tank 4b. However, the present invention is not limited thereto. For example, the bellows 18 may be provided in the switching device side first tank 4a, the hand hole 16 may be provided in the transformer side first tank 4b, and either the switching device side first tank 4a or the transformer side first tank 4b may be provided. Either one of the handhole 16 and the bellows 18 may be provided on either side.

Embodiment 3 FIG.
FIG. 6: is sectional drawing which shows the internal structure of the connection part containing the connection apparatus concerning Embodiment 3 of this invention. 7 is a cross-sectional view taken along the line BB shown in FIG. FIG. 8 is a front view of the plate. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the third embodiment, the conductor of the transformer 60 and the connection conductor 8 of the connection device 100 are configured in three phases, and the closed tank of the transformer 60, the first tank 104, and the second tank 106 are provided with conductors. And three connecting conductors 8 are provided in a lump. In accordance with this, three each of the first spacer 11, the second spacer 12, and the third spacer 13 are used. The gas insulated switchgear 1 is made to correspond to three phases by using three.

  As shown in FIG. 7, the three connection conductors 8 and the three second spacers 12 are arranged at positions that become equilateral triangles. A second plate 22 is provided between the first tank 104 and the second tank 106 in order to close the gap between the three second spacers 12. The other spacers 11 and 13 are similarly arranged in an equilateral triangle, and a first plate 21 and a third plate 23 are provided to prevent a gap therebetween. The plates 21, 22, and 23 are configured using the same material as the first tank 104 and the second tank 106, for example, metal.

  As shown in FIG. 8, openings 21a, 22a, and 23a are formed in the plates 21, 22, and 23 at positions where the spacers 11, 12, and 13 are disposed. The ratio between the inner diameter d3 of the first tank 104 and the second tank 106 and the inner diameter d2 of the closed tank of the gas insulated switchgear 1, that is, d2 / d3 is set to satisfy d2 / d3 <1 / 2.5. By doing so, the arrangement of the spacers 11, 12 and 13 is optimized.

  In the third embodiment, the plates 21, 22, 23 and the tanks 104, 106 are configured separately, but the present invention is not limited to this. For example, the first plate 21 and the first tank 104 may be integrally formed, or the second plate 22 and the second tank 106 may be integrally formed.

  Further, the second tank 106 may have a structure satisfying the second type pressure vessel structure standard as in the first embodiment. Moreover, you may apply the attachment / detachment connection part, handhole, and bellows which were demonstrated in the said Embodiment 2 to the connection apparatus 100 concerning this Embodiment 3. FIG.

Embodiment 4 FIG.
FIG. 9: is sectional drawing which shows the internal structure of the connection part containing the connection apparatus concerning Embodiment 4 of this invention. FIG. 10 is a cross-sectional view taken along the line CC shown in FIG. FIG. 11 is a front view of the spacer. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the fourth embodiment, the conductor of the gas-insulated switchgear 70, the conductor of the transformer 60, and the connection conductor 8 of the connector 150 are configured in three phases. Inside the first tank 154 and the second tank 156, three conductors and connection conductors 8 are provided collectively. Accordingly, three openings 161a, 162a, and 163a are formed in the first spacer 161, the second spacer 162, and the third spacer 163, respectively.

  The embedded conductor 14 is embedded in each of the openings 161a, 162a, and 163a. Further, the first spacer 161, the second spacer 162, and the third spacer 163 have a shape in which three openings 161a, 162a, and 163a are convex toward the gas insulated switchgear 70 side.

  The ratio between the inner diameter d4 of the first tank 154 and the second tank 156 and the inner diameter d5 of the closed tank of the gas insulated switchgear 70, that is, d5 / d4 is set so that d5 / d4 <1 / 2.0. Thus, the shape of the spacers 161, 162, and 163 is optimized.

  Further, the second tank 156 may have a structure satisfying the second type pressure vessel structure standard as in the first embodiment. Moreover, you may apply the attachment / detachment connection part, handhole, and bellows which were demonstrated in the said Embodiment 2 to the connection apparatus 150 concerning this Embodiment 3. FIG.

  As described above, the connection device according to the present invention is useful for a connection device for connecting a gas insulated switchgear and a transformer.

DESCRIPTION OF SYMBOLS 1 Gas insulation switchgear 2 Transformer 3 Connection apparatus 4 1st tank 4a Switchgear side 1st tank 4b Transformer side 1st tank 5 1st intermediate chamber 6 2nd tank 7 2nd intermediate chamber 8 Connection conductor 8a Switchgear side Conductor 8b Transformer side conductor 9 Socket 11 First spacer 11a Opening 12 Second spacer 12a Opening 13 Third spacer 13a Opening 14 Embedded conductor 15 Removable connection 15a Bolt hole 16 Hand hole 17 Lid 18 Bellows 19 Bolt 21 First plate 21a Opening 22 2nd plate 22a Opening 23 3rd plate 23a Opening 50 Connection device 60 Transformer 70 Gas insulation switchgear 100 Connection device 104 1st tank 106 2nd tank 150 Connection device 154 1st tank 156 2nd tank 161 1st spacer 161a opening 162 second space 162a opening 163 third spacer 163a opening

Claims (10)

A connection device for connecting a gas insulated switchgear and a transformer,
A first tank forming a first intermediate chamber adjacent to the gas insulated switchgear;
A second tank forming a second intermediate chamber between the first intermediate chamber and the transformer;
A first spacer that partitions the gas-insulated switchgear from the first intermediate chamber;
A second spacer that partitions the first intermediate chamber and the second intermediate chamber;
A third spacer that partitions the second intermediate chamber and the transformer;
The tank is provided inside the first tank and the second tank, and penetrates the first to third spacers to electrically connect the conductor of the gas insulated switchgear and the conductor of the transformer. A conductor, and
The first to third spacers have a shape that protrudes toward the gas-insulated switchgear. The first intermediate chamber is filled with an insulating gas;
The connecting device according to claim 1, wherein the second intermediate chamber is filled with oil.   The connection device according to claim 1, wherein the first intermediate chamber and the second intermediate chamber are filled with an insulating gas. The in-tank conductor includes a switch-side conductor provided on the gas-insulated switchgear side in the first tank and a transformer-side conductor provided on the transformer side in the first tank. And
The first tank can be divided into a switch-side first tank on the gas-insulated switchgear side and a transformer-side first tank on the transformer side, the switch-device-side first tank and the transformer At least one of the side first tanks is provided with an expansion / contraction part, and can be expanded / contracted substantially parallel to the direction in which the conductor extends,
It further includes a detachable connection part that is detachably provided between the switchgear-side conductor and the transformer-side conductor, and electrically connects the switchgear-side conductor and the transformer-side conductor. The connecting device according to any one of claims 1 to 3. The tank conductor is composed of a single phase,
1.4 ≦ d1 / d2 ≦ 2.0, where d1 is the inner diameter of the first tank and second tank, and d2 is the inner diameter of the tank constituting the outer shell of the gas insulated switchgear. The connection device according to claim 2. The tank conductor is composed of three phases,
The first to third spacers are provided in three corresponding to the respective conductors in the tank,
A first plate that partitions the gas insulated switchgear from the first intermediate chamber;
A second plate that partitions the first intermediate chamber and the second intermediate chamber;
A third plate for partitioning the second intermediate chamber and the transformer,
The connection device according to claim 1, wherein the first to third plates are formed with three openings that are closed by the first to third spacers. The three-phase in-tank conductors are connected to conductors respectively provided in three tanks constituting an outer shell in the gas-insulated switchgear,
When the inner diameters of the first tank and the second tank are d3 and the inner diameter of the tank constituting the outer shell of the gas insulated switchgear is d2, d2 / d3 <1 / 2.5 is satisfied. The connection device according to claim 6. The tank conductor is composed of three phases,
2. The first to third spacers have a shape in which the three-phase in-tank conductor penetrates through one spacer and the penetrating portion protrudes toward the gas-insulated switchgear. The connection apparatus as described in any one of -4. The three-phase in-tank conductor is connected to a conductor provided in one tank constituting an outer shell in the gas insulated switchgear,
When the inner diameters of the first tank and the second tank are d3, and the inner diameter of one tank constituting the outer shell in the gas insulated switchgear is d5, d5 / d4 <1 / 2.0. The connection device according to claim 8.   The connecting device according to claim 1, wherein the second tank has a structure that satisfies a second type pressure vessel structure standard according to the Industrial Safety and Health Act.

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