JP5523903B2 - Gas insulated bus - Google Patents

Description

  The present invention relates to a gas insulated bus used in a gas insulated switchgear.

In recent electric stations such as substations and switch stations, gas insulated switchgear (GIS) using SF ₆ gas having excellent insulation performance as a main insulating medium is used. This GIS uses an L-shaped gas insulated bus in order to connect a device such as a gas insulation breaker (GCB) or a branch bus from the main bus (see, for example, Patent Document 1).

FIG. 9 is a cross-sectional view of an L-shaped gas-insulated bus showing a single-phase structure of an L-shaped gas-insulated bus having a three-phase package structure described in Patent Document 1 and the like for convenience of explanation.
Hereinafter, the prior art will be described with reference to FIGS. 9 to 11.

  First, in FIG. 9, 1 is a tank of an L-shaped gas insulated bus, which is formed in a cylindrical shape, having openings 1a and 1b at both ends in the longitudinal direction, and a radial direction perpendicular to the longitudinal direction. An opening 1c is formed in the upper part.

The tank 1 contains an insulating gas G such as SF ₆ gas inside, and the opening 1a and the opening 1c at a position orthogonal to the opening 1a are insulated spacers 2 ₁ , 2 having embedded electrodes 3 ₁ , 3 ₂ , respectively. is closed by 2 _2, the opening 1b facing the opening 1a is adapted to be closed by the closed lid 4. The insulating spacers 2 ₁ and 2 ₂ and the closing lid 4 are fixed to flanges formed in the openings 1a to 1c by bolts (not shown).

Then, the embedded electrode 3 _{and second} insulating spacer 2 ₂ provided in a radial direction perpendicular to the longitudinal direction of the tank 1, L-shaped conductors (hereinafter referred to as L-shaped conductor) is formed on the radial end portion of the 5 contact portion 5 ₁ is adapted to the contact portion 5 ₁ is also connected to the electrical and buried electrode 3 ₂ by being rigidly fixed by fixing bolts _61. Insulating spacer Thus, in the state of fixing the contact portions 5 ₁ which is formed at one end of the L-shaped conductor 5 to the embedded electrode 3 _2, a round bar-like connector 5 ₂ of the other end, which is located in the longitudinal direction of the tank 1 2 Located so as to face ₁ .

Round rod connectors 5 ₂ formed at the other end of the L-shaped conductors 5, the longitudinal center line CL ₁ on the arranged conductor of the tank 1 (hereinafter, referred to as longitudinal conductor) 7 one end to the It is adapted to be electrically connected by being fitted through the contact piece ₈₁ against the formed circular engagement groove 7 _h. Here, it will be referred to as a round bar connectors 5 _2, the configured connection portion from the circular fitting groove 7 _h and the contact piece ₈₁ and the connecting portion 9.

On the other hand, a round bar-like connector 7 ₂ formed at the other end (shown top) of the longitudinal conductor 7, the circular fitting groove 10 _h of the connecting conductor 10 which is fixed to the embedded electrode 3 _first insulating spacer 2 ₁ It is fitted connected through the contact piece ₈₂ against. Here, round bar connectors 7 _2, will be a configured connection portion from the contact piece ₈₂ and the circular fitting groove 10 _h is referred to as a connecting portion 11.
The connection conductor 10 is adapted to be satisfactorily connected to the electrical by being fixed to the embedded electrode 3 ₁ by a fixing bolt 6 _2.

In Figure 9, L1 is (a radial distance portion i.e. L-shaped conductors 5) The distance to the longitudinal center line CL ₁ of the longitudinal conductors 7 from the flange surface of the insulating spacer 2 _2, L2 is the diameter of the L-shaped conductors 5 the distance from the center line CL ₂ directions portion to contact pieces _{8 1} of the rod-shaped end portion _{5 2,} L3 is the distance to the contact piece ₈₂ the center of the connection conductor 10 from the contact piece ₈₁ center.

  10 and 11 are diagrams showing an assembly process of a conventional L-shaped gas insulated bus, FIG. 10 is a diagram showing an assembly process of an L-shaped gas insulated bus having a three-phase structure, and FIG. 11 is a single-phase structure. It is a figure which shows the assembly process of the L-shaped gas insulation bus-line.

When the L-shaped conductor 5 shown in FIG. 10B is inserted into the tank opening 1c, the X portion of the L-shaped conductor 5 does not collide with the tank opening 1c and is not damaged. Insert carefully while rotating. When it is inserted to a predetermined position by bolts and nuts (not shown) for fastening the flange surface of the insulating spacer 2 ₂ and the tank opening 1c. This state is shown in FIG. Incidentally, the X moiety carefully inserted while rotating clockwise in the same manner in the case of L-shaped gas insulated bus of the single-phase structure, by bolts and nuts (not shown) in a state of being inserted in a predetermined position between the insulating spacer 2 ₂ The flange surface with the tank opening 1c is fastened.

After Figure 10 L-shaped conductor 5 as in (a) is fixed in position, as shown in Figure 11, the circular fitting longitudinal conductor 7 with respect to the rod-shaped end portion 5 ₂ of L-shaped conductors 5 the groove 7 _h fitted through the contact pieces _81, furthermore, a circular fitting of the rod-like end 7 ₂ via the contact piece ₈₂ is fixed to the embedded electrode 3 _first insulating spacer 2 ₁ connection conductors 10 fitting the groove 10 _h, fastened by bolts and nuts (not shown) the flange surface of the insulating spacer 2 ₁ and the tank opening 1a. FIG. 11 shows the case of an L-shaped gas insulated bus having a single phase structure, but the same applies to the case of an L-shaped gas insulated bus having a three-phase structure.

Next, with reference to the schematic diagram of FIG. 12, the moment generated during energization of the L-shaped conductor 5 and the longitudinal conductor 7 will be described.
In FIG. 12, the intersection of the center line CL2 of the radial portion of the L-shaped conductor 5 and the flange surface of the embedded electrode 32 is A, and the center of the radial portion of the L-shaped conductor 5 that is a bent portion of the L-shaped conductor 5 The intersection of the line CL2 and the center line CL1 of the longitudinal conductor 7 is B, the position of the connecting portion 9 (strictly speaking, the position of the contact piece 81) is C, and the position of the connecting portion 11 (strictly speaking, the position of the contact piece 82) ) Is D, when a current i is applied to the L-shaped conductor 5 and the longitudinal conductor 7, a downward electromagnetic force F1 is illustrated between the points AB and between the points BC and CD. Are applied with electromagnetic forces F2 and F3 directed to the left in the figure.

  Gas insulated buses are required to reduce manufacturing costs while maintaining the performance of L-shaped gas insulated buses. To that end, the conductors, insulation spacers and tanks are downsized to reduce the overall gas insulation equipment. It is necessary to reduce the material cost.

However, the L-shaped gas insulated bus of conventional construction shown in FIG. 9, since the fixing the electrode 3 ₂ embedding the radial portion of the L-shaped conductors 5 by bolts 6 _1, as shown in FIG. 12, an electromagnetic force Selection of the bolt diameter that can withstand the moments caused by F1, F2, and F3, the bolt pitch dimension, and the connection conductor diameter are determined.

  For this reason, in the L-shaped gas insulated bus having the conventional configuration shown in FIG. 9, the diameter of the connecting conductor cannot be reduced due to the limit of reducing the bolt pitch dimension, which is one of the reasons that the cost cannot be lowered after all. It is connected.

JP 2000-312411 A

  By the way, as performance required for the L-shaped gas insulated bus, there are three points of current conduction performance, withstand voltage performance and short-time withstand current conduction performance. Among these, the electromagnetic force generated by the short-time withstand current i with the severest mechanical stress will be described with reference to FIG. The electromagnetic force generated in the L-shaped conductor 5 is indicated by a distributed load Fs and a distributed load FL as shown in FIG. The magnitude of the electromagnetic force increases in proportion to the square of the magnitude of the short-time energization current i. The short-time withstand current-carrying performance is a performance that does not cause contact meltdown, damage due to deformation of the conductor, or poor withstand voltage performance when a short-circuit current such as a ground fault flows through the conductor. Although it is as short as ˜3 seconds, an electromagnetic force in the direction shown in FIG. 13 is generated.

  The force received by the electromagnetic force of the L-shaped gas insulated bus having the conventional configuration shown in FIG. 9 will be described with reference to the schematic diagram of FIG. Although the electromagnetic force is a distributed load, in order to simplify the explanation, if expressed as a resultant force of an evenly distributed load, the resultant force of the electromagnetic force generated by the distances L2 and L3 with respect to the distance L1 is F1, and with respect to the distance L2 The resultant force of the electromagnetic force generated by the distance L1 is F2 and the resultant force of the electromagnetic force generated by L1 with respect to L3 is F3. These resultant forces generate moments in the same direction around all points A. Considering the moment at point A, the resultant forces F1, F2, and F3 are substantially equivalent to those generated at substantially the center of the distances L1, L2, and L3.

Here, the moment around the point A will be described in a little more detail with reference to FIGS. Since the connection portion 9 is a contact connection with a spring property, only the force in the direction perpendicular to the conductor axis is transmitted, and no moment is transmitted. Therefore, the point C in FIG. 12 can be considered as a free end. Since the connection part 11 is the same, the point D in FIG. 12 is also a free end. Since L-shaped conductor 5 and the electrode 3 ₂ fixed by bolts 6 _1, A point is a fixed end. Pulling load generated in the bolt ₆₁ for fixing the L-shaped conductor 5 are added to the electromagnetic force F1, F2, F3, the addition of the force generated by the moment of the point A about _{M 1, M 2, M 3} .

Each moment is
M ₁ = L1 / 2 × F1,
M ₂ = L2 / 2 × F2,
M ₃ = L2 × F3 / 2,
Since L3 is fixed at both ends by the connecting portions 9 and 11, it is assumed that the L2 side end receives half the force of F3. Therefore, the total moment Mt around the point A is Mt = M ₁ + M ₂ + M ₃ = (L1 × F1 + L2 × (F2 + F3)) / 2
It is represented by

Next, the fixing bolts ₆₁ of the pull-out load generated by the moment Mt of the point A around will be described with reference to FIG. 14.
Mt generates a pulling force Fb ₁ of fixing bolts ₆₁ represented by the following formula by the fulcrum E and moment arm r.
Fb ₁ = Mt / r

F2 and F3, since the bolt ₆₁ is parallel securing the L-shaped conductor 5 and the electrode 3 _2, acts as a pull-out load. However, F3 is halved because the force applied to the L2 side end is affected. Accordingly, the total drawing force Fb generated in the fixing bolt ₆₁ becomes the following expression.
Fb = (L1 × F1 + L2 × (F2 + F3)) / 2r + (F2 + F3 / 2)

In the above manner, drawing force Fb generated in the fixing bolt _61, the moment M _2, M ₃ and a force is significantly influenced by, in the conventional structure, the moment M _2, M ₃ is a value determined by the structure, It cannot be made smaller. Therefore, there is a limit to reducing the conductor diameter and the bolt pitch dimension, and a new gas-insulated bus bar with an L-shaped conductor structure is required to achieve further reduction in equipment.

  Accordingly, an object of the present invention is to provide a gas-insulated bus that can reduce a bolt pull-out load due to electromagnetic force generated by a short-time withstand current and minimize a conductor diameter.

In order to achieve the above object, the invention according to claim 1 includes a cylindrical tank filled with an insulating gas and having openings in the longitudinal direction and the direction perpendicular to the longitudinal direction, and the longitudinal direction inside the tank. A longitudinal conductor disposed in the longitudinal direction, a radial conductor connected to the longitudinal conductor and disposed perpendicular to the longitudinal conductor, and the longitudinal conductor and the radial conductor at the opening of the tank A gas-insulated bus having an insulating spacer for fixing the two conductors at the intersection of the central axis of the longitudinal conductor and the central axis of the radial conductor, and rounding the end of the longitudinal conductor. It is formed in a rod shape, the end portion of the radial conductor is formed in a circular fitting groove, and the round rod-like end portion is fitted in the circular fitting groove to form a connection portion of the two conductors. To do.

  According to the present invention, it is possible to provide a gas-insulated bus that can reduce the pull-out load of the bolt due to electromagnetic force to the radial conductor, and as a result, can minimize the conductor diameter of the radial conductor.

Sectional drawing which shows the gas insulation bus-line in Embodiment 1 of this invention. The figure which showed typically the relationship between the electromagnetic force of FIG. 1, and a moment. Sectional drawing which shows the gas insulation bus-bar of the modification of Embodiment 1. FIG. Sectional drawing which shows the gas insulation bus-line in Embodiment 2 of this invention. Sectional drawing which shows the gas insulation bus-line in Embodiment 3 of this invention. Sectional drawing which shows the assembly process of the gas insulation bus-line of FIG. Sectional drawing which shows the gas insulation bus-bar of the modification of Embodiment 3. Sectional drawing which shows the assembly process of the gas insulation bus-line in Embodiment 4 of this invention. FIG. 6 is a structural diagram of a conventional gas insulated bus. Sectional drawing which shows the assembly process of the conventional gas insulated bus. Sectional drawing which shows the assembly process of the conventional gas insulated bus. The figure which showed typically the relationship between the electromagnetic force and moment of the gas insulated bus of FIG. The schematic diagram of the direction of the electromagnetic force which acts on an L-shaped conductor. The bolt fastening figure of an embedded electrode and an L-shaped conductor.

Embodiments of the present invention will be described below with reference to the drawings.
Note that the same portions are denoted by the same reference numerals throughout the drawings, and redundant descriptions are omitted as appropriate.

[Embodiment 1]
FIG. 1 is a configuration diagram of Embodiment 1 of a gas insulated bus according to the present invention, and FIG. 2 is a diagram schematically showing a relationship between electromagnetic force and moment generated in the gas insulated bus of Embodiment 1.

In FIG. 1, the main differences between the first embodiment and the conventional gas-insulated bus shown in FIG. 9 are that the L-shaped conductor 5 is replaced with a linear radial conductor 5A, and this radial conductor. the intersection portion of the center line CL ₁ of the center line CL ₂ and longitudinal conductor 7 of 5A lies in placing the connection part 9 of both conductors 5A and 7. The other is a configuration similar to the configuration of FIG.

Radial conductor 5A employed in this first embodiment, mechanically robust is connected to the contact portion 5A ₁ formed at one end with a bolt ₆₁ to the embedded electrode 3 _{and second} insulating spacer 2 ₂ electrically It is fixed to, and disposed a circular fitting groove 5A _h formed at the other end in the longitudinal center line direction conductors 7 CL ₁ coaxially. And, this is a circular fitting groove 5A _h has a longitudinal round bar connector ₇₁ formed at one end of the direction conductor 7 via a contact piece ₈₁ fit connection, whereby both conductors 5A and 7 Have a good electrical connection.

The longitudinal conductors 7 forms a second end portion (shown top) to similarly round rod connectors 7 _2, connecting the round bar connector 7 ₂ at the other end via a contact piece ₈₂ conductor 10 are fitted and connected to the circular fitting groove 10 _h and are electrically connected to the connecting conductor 10 in an excellent manner. Thus, the radial conductor 5A and a longitudinal conductor 7, contact the round bar connector ₇₁ which is formed longitudinally conductor 7 end in the radial conductor 5A edge of the circular fitting groove 5A _h piece thereby making it possible to assemble the connecting portion 9 only by inserting through the 8 _1.

Thus, connected to the longitudinal center line CL ₁ of the tank 1, at the intersection with the radial direction of the center line CL ₂ orthogonal thereto, and end portions of the longitudinal conductor 7 of the radial conductor 5A by, embedded electrode 3 end of the radial conductor 5A of ₂ on the side to be fixed becomes connected structurally fixed end and the radial conductor the other end of the connecting portion 9 of 5A is free for contact connection End. Similarly, the connecting portion 11 of the other end portion 7 ₂ side and the connecting conductor 10 in the longitudinal conductors 7 also for contact connection, the free end.

In the gas-insulated bus configured as shown in FIG. 1, when an electromagnetic force is generated by a short time current application, the electromagnetic force in the F1 direction is applied to the radial conductor 5A and the F4 direction is applied to the longitudinal conductor 7 as shown in FIG. Works. Moment M ₄ point B around generated by the electromagnetic force F4, since the connection portion 9 is a free end, not transmitted to the A point.

As a result of adopting the configuration of FIG. 1 in the first embodiment, it will be described below that the moment M ₂ around the point A generated by the distance L2 between B and C in FIG. 12 does not occur.
Here, with respect to the moment M _2, M ₃ is fixed bolt ₆₁ in Figure 12, about what had affected the extent pulling load, shows an example of the effect by substituting specific numerical values.

For the gas insulated bus having the conventional structure shown in FIG. 12, the electromagnetic force and moment are obtained by substituting the following numerical values.
L1 = 500 [mm],
L2 = 250 [mm],
L3 = 2250 [mm],
r = 40 [mm]
The short-time current flowing through the L-shaped gas insulated bus is assumed to be i = 104 kAp (40 kA × 2.6 times).

Based on the above values, the calculation results are shown below.
F1 = 352 [kgf] = 3452 [N],
F2 = 196 [kgf] = 1922 [N],
F3 = 140 [kgf] = 1373 [N],
Thus, the total pulling force of the fixing bolts ₆₁ are
Fb = (L1 × F1 + L2 × (F2 + F3)) / 2r + (F2 + F3 / 2)
= 3516 [kgf] = 34.5 [kN]
It becomes.

Incidentally, the values of M ₁ , M ₂ , and M ₃ are as follows.
M ₁ = 88000 [kg · mm] = 863 [Nm],
M ₂ = 24500 [kg · mm] = 240 [Nm],
M ₃ = 17500 [kg · mm] = 172 [Nm]

Next, calculate the pull-out load of the fixing bolt ₆₁ about the structure of the first embodiment shown in FIG.
The values to be substituted for the dimensions shown in FIG. 2 are shown below.
L1 = 500 [mm],
L4 = 2500 [mm],
r = 40 [mm]
The short-time current flowing through the L-shaped gas insulated bus is assumed to be i = 104 kAp (40 kA × 2.6 times).

Based on the above values, the calculation results are shown below.
F1 = 352 [kgf],
F4 = 336 [kgf],
M ₁ = 88000 [kg · mm] = 863 [Nm]
Thus, the total pulling force of the fixing bolts _{61 are, Fb = F4 / 2 + M} 1 /r=2368[kgf]=23.2[kN by half and _{M 1} of the electromagnetic force F4]
It becomes.

In the first embodiment, by eliminating the influence of M ₂ and M ₃ , the bolt pull-out load due to electromagnetic force can be reduced by 67% compared to the conventional structure, and the bolt pitch dimension and conductor diameter can be reduced. Achieved, and the size of the equipment can be reduced.

  As described above, according to the first embodiment, a gas-insulated bus bar that can reduce the pull-out load of the bolt due to electromagnetic force on the radial conductor 5A and consequently minimize the conductor diameter of the radial conductor 5A is provided. It becomes possible.

[Modification of Embodiment 1]
The configuration of the connecting portion 9 formed by the longitudinal conductor 7 and the radial conductor 5A is not limited to that shown in FIG. 1 and may be modified as shown in FIG.

Arrangement of Figure 3, the rod-like connector ₇₁ which is formed on the bottom end portion in the longitudinal direction conductor 7 is extended, while the insulation in place of the closing lid 4 so as to face the extended portion of the rod-shaped connector 7 ₁ the spacer _{2 3} provided by the insulation spacer _{2 3} embedded electrodes _{3 3} a connection conductor 10A to a connection fixed and connected through the contact pieces _{8 3} and a connection conductor 10A of a round bar connector 7 ₁ Toko, An example in which the present invention is applied to a gas-insulated bus having a substantially orthogonal T-shaped conductor structure is shown.

  Further, although not shown, the T-shaped conductor structure of FIG. 3 may be changed to a cross-shaped conductor structure.

[Embodiment 2]
Hereinafter, Embodiment 2 of the gas insulated bus according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as Embodiment 1, and the overlapping description is abbreviate | omitted.

Embodiment 2 changes the round bar connector 7 ₁ and 7 ₂ formed at both ends of the longitudinal conductor 7 of the first embodiment, each spherical connectors 7 ₃ and 7 _4, spherical shape of the connecting portion 9 place the contacts of the connector 7 ₃ on the radial conductor 5A conductor centerline CL ₂ of similarly even connecting portion 11 for connecting the connection conductor 10 and the spherical connector 7 _4.

Furthermore, between the insulating spacer 2 ₁ tank 1 and the connecting conductor 10 side to mount the bellows 12 for absorbing large displacement of the inner conductor and the tank.

Embodiment 2, since it is configured as described above, in addition to the effect of the bolt diameter and bolt pitch dimension of the fixing bolt ₆₁ in the radial conductor 5A of the first embodiment can be minimized, the conductor 7 by the degree of freedom of tilt is increased, without interfering with the displacement absorbing capacity of the bellows 12, it is possible to suppress the moment generated in the fixed bolt ₆₁ around the radial conductor 5A by electromagnetic force. As a result, the conductor diameter and the bolt pitch dimension can be reduced, and a large displacement absorbing function can be achieved, thereby reducing the size of the entire device.

[Embodiment 3]
Hereinafter, Embodiment 3 of the gas insulated bus according to the present invention will be described with reference to FIGS. Figure 5 shows a state incorporating radial conductor 5A in the tank 1, FIG. 6 is a sectional view showing an assembly process of FIG. 5, integrated radial conductor 5A and the insulating spacer 2 ₂ before incorporating Shows the state.

  5 and 6, the third embodiment is characterized in that the connection configuration between the longitudinal conductor 7 and the radial conductor 5A in the first embodiment is changed, and the same configuration as that of the first embodiment. Are denoted by the same reference numerals, and redundant description is omitted.

Embodiment 3 is provided with a circular fitting groove 7 _h longitudinally conductor 7 in place of the round bar connector ₇₁ of the center line CL ₂ concentric and circular fitting groove 5A _h of the radial conductor 5A characterized in that a round bar connector 5A ₂ instead.

Thus the connection part 11 of the longitudinal conductor 7 in the longitudinal direction conductor 7 central axis CL ₁ and coaxially with, the other connecting portion 9 is configured with the central axis CL ₂ coaxially in the radial conductor 5A.

It is possible to bolt withdrawal load by electromagnetic force acting in the longitudinal direction conductor 7 to 0kg to radial conductor 5A by a connector 5A ₂ provided on the center axis CL ₁ and axis-perpendicular direction of the longitudinal conductor 7. That radial conductor 5A is need only withstand the pull-out load received from moment M ₁ generated by F1. That is, in FIG. 2, Mt = M ₁ = Fb × r
Next, the moment generated in the fixed bolt ₆₁ around smaller.

With the above configuration, pulling the load Fb of the fixing bolt _{6 1} is calculated using the values of Embodiment 1 Fb ₌ M 1 /r=88000/40=2200[kgf]=21.6[kN]
Thus, it can be further reduced to 93% from the first embodiment, and to 63% with respect to the conventional structure.

  When the configuration of the third embodiment is used, the effect is exhibited when L4 is long or the short-time withstand current is large.

  As described above, according to the third embodiment, it is possible to provide an L-shaped gas insulated bus that minimizes the fixing bolt pull-out load and suppresses the influence of electromagnetic force due to a short-time current.

[Modification of Embodiment 3]
The connection between the longitudinal conductor 7 and the radial conductor 5A is not limited to the above-described FIGS. 5 and 6 and may be deformed as shown in FIG.

Figure 7 is a longitudinal conductors 7 positioned on the connecting portion 9 side extending toward the opening 1b side, also, it is connected and fixed to the embedded electrodes 3 ₃ of insulating spacer 2 ₃ provided in place of the closed lid 4 the connection conductor 10A provided, by connecting through the contact pieces 8 ₃ and a connection conductor 10A of a round bar connector ₇₁ Toko longitudinal conductors 7, the gas insulated bus having a conductor structure of T-shaped and substantially perpendicular An example is also shown.

  Further, although not shown, the T-shaped conductor structure of FIG. 7 may be changed to a cross-shaped conductor structure.

[Embodiment 4]
The gas insulated bus according to the modified example (FIG. 7) of Embodiment 1 (FIG. 1) to Embodiment 3 described above is an example applied to a single-phase structure in which one bus is accommodated in one tank. Form 4 is applied to a so-called three-phase collective structure in which three-phase buses are stored in one tank. Hereinafter, a specific description will be given with reference to FIG.

  FIG. 8 is a view showing an assembling process of a gas-insulated bus having a three-phase collective structure according to the fourth embodiment. In FIG. 8, the longitudinal conductor 7 and the connecting portion 9 in the tank 1 are omitted.

  Hereinafter, the assembly procedure of the gas insulated bus according to the fourth embodiment will be described in comparison with the L-shaped conductor having the conventional shape shown in FIG.

When attaching the conductive assembly portion entered into radial conductor 5A and the spacer 2 ₂ to the tank 1, it is necessary to assembly through the tank opening 1c. The conventional L-shaped conductor shown in FIG. 11 may be rotated clockwise to prevent damage when inserting the X portion of the radial conductor 5 into the tank opening 1c. It is difficult and takes a long time.

  However, in the gas insulated bus according to the fourth embodiment, since the radial conductor 5A is straight as shown in FIG. 8, there is no X portion bent at about 90 degrees as shown in FIG. Work time can be shortened. Moreover, in the L-shaped conductor 5 of the conventional shape, as shown in FIG. 13, since the final docking location cannot be visually confirmed from the tank opening 1c at the connecting portion 9, only the connecting portion 11 that can be visually confirmed from the tank opening 1a side. It becomes.

  On the other hand, in the fourth embodiment, since the connection portion 9 is provided at the intersection of the radial conductor 5A and the longitudinal conductor 7 as in FIG. 6 of the third embodiment described above, the connection is also made from the tank opening 1c. The portion 9 can be visually confirmed, and the final docking location can be provided at both the connecting portions 9 and 11, so that the assembly efficiency can be improved.

  With the above configuration, the assembly work time can be shortened, the conductor shape can be reduced, and an inexpensive gas-insulated bus can be provided.

[Modification of Embodiment 5]
This structure can also be applied to a gas-insulated bus having a T-shaped conductor structure substantially orthogonal as shown in FIG. Furthermore, it can be applied to a cross-shaped conductor structure.

1 ... _tank, 2 1, _{2 2,} 2 3 _... insulating _spacer, 3 1, _{3 2,} 3 3 _... buried electrode, 4 ... closing plates, 5A ... radial conductor, 5A ₁ ... contact portion, 5A h _... fitting circular if the _grooves, 6 1, _{6 2,} 6 3 _... fixing bolt 7 ... longitudinal _conductors, 7 _1, 7 _2, 7 3, _{7 4} ... connector, 7 h _... circular fitting groove contact _{portion, 81,} 82 ₂ , 8 _3, contact piece, 9, connection portion, 10, connection conductor, 11, connection portion, G, insulating gas, 12, bellows.

Claims (4)

A cylindrical tank filled with an insulating gas and having openings in the longitudinal direction and the direction perpendicular to the longitudinal direction, a longitudinal conductor disposed in the longitudinal direction inside the tank, and connected to the longitudinal conductor; In a gas-insulated bus having a radial conductor arranged to be orthogonal to the longitudinal conductor, and an insulating spacer that fixes the longitudinal conductor and the radial conductor at the opening of the tank,
A connecting portion of both conductors is arranged at the intersection of the central axis of the longitudinal conductor and the central axis of the radial conductor ,
The ends of the longitudinal conductors are formed in a round bar shape, the ends of the radial conductors are formed in a circular fitting groove, and the round bar shaped end parts are fitted in the circular fitting groove to A gas-insulated bus having a connection portion .   The ends of the longitudinal conductor are formed in a spherical shape, the ends of the radial conductor are formed in a circular fitting groove, and the spherical ends are fitted in the circular fitting groove to The gas-insulated bus according to claim 1, wherein a connecting portion is formed.   The end portion of the longitudinal conductor is formed in a circular fitting groove concentric with the central axis of the radial conductor, the end portion of the radial conductor is formed in a round bar shape or a spherical shape, and the round bar shape or the spherical end The gas-insulated bus according to claim 1, wherein a connecting portion of the two conductors is formed by fitting a portion into the circular fitting groove. The gas-insulated bus according to any one of claims 1 to 3 , wherein the longitudinal conductor and the radial conductor for each of the three phases are housed in one tank.

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