JP2580939Y2 - Bus conductor support device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bus conductor supporting device for a phase-separated bus connecting a generator and a main transformer in a power plant or the like.

[0002]

2. Description of the Related Art The configuration of a conventional bus conductor supporting device described in, for example, Japanese Utility Model Publication No. 55-115224 will be described with reference to FIGS. 6 and 7, the holding member 19 has an engaging portion 27 having an outer diameter substantially equal to the inner diameter of the cylindrical busbar conductor 14, and a male thread portion 25 orthogonal to the engaging portion 27. The holding metal member 19 is attached to the distal end portion of the supporting insulator 18 in advance by screwing the male screw portion 25 into the female screw portion 24 of the supporting metal member 17 embedded in the supporting insulator 18. On the other hand, the bus bar 14 is provided with an elongated hole 26 extending in the axial direction at a place where the bus conductor 14 is insulated and supported by the supporting insulator 18. Long hole
The shape of 26 is such that the arcuate engaging portion 27 of the holding bracket 19 is a bus conductor.
The size is such that it can be inserted through the inside of the bus conductor 14 from the axial direction of 14. Generally, the length of the bus conductor 14 is about 10 m and is supported by about four support insulators 18. In assembling, the bus conductor 14 is previously jacked up to a predetermined height, the longitudinal direction of the engaging portion 27 of the clamping metal 19 is oriented in the direction of the axis of the bus conductor 14, and the elongated hole 26 is inserted. After being inserted through the inside of the bus bar conductor 14, the engaging portion 27 of the
By rotating the supporting insulator 18 by about 90 degrees so that the longitudinal direction of the bushing is oriented in a direction perpendicular to the axis of the busbar conductor 14, the arc-shaped holding bracket 19 is engaged with the inner peripheral surface of the busbar conductor 14, and 14
Is strongly held between the clamp 19 and the support insulator 18. Then, by lowering the jack and fixing the support insulator 18 to the support base 21, the bus conductor 14 is insulated and supported.

[0003]

Since the conventional bus conductor supporting device is configured as described above, it is necessary to check whether the clamping metal 19 is correctly engaged with the inner peripheral surface of the bus conductor 14 in the designed relationship. Is difficult to confirm from the outside, and when the engagement is loosened due to aging, it is practically impossible to detect the slack from the outside. In addition, support insulator 18
Is rotated to engage the holding member 19 with the busbar conductor 14.However, since the support insulator 18 is generally formed of porcelain, resin, or the like, it is easily broken and it is difficult to apply a sufficient tightening torque. Was. Further, when it is necessary to replace the support insulator 18 due to damage or the like, it is necessary to perform a procedure reverse to the above-described assembly procedure. However, there is a problem that the support insulator 18 must be removed from the support base 21 and the bus conductor 14 must be jacked up.

The present invention has been made to solve the above-mentioned problems, and the state of attachment or looseness of the supporting portion of the bus conductor can be easily observed from the outside, and a large tightening torque is applied to the supporting insulator. It is an object of the present invention to provide a bus conductor supporting device which can be detached independently of one supporting insulator.

[0005]

According to the present invention, a bus conductor supporting device according to the present invention includes a grounded substantially cylindrical jacket, and a coaxial line on a vertical plane including the axis of the jacket inside the jacket. A plurality of support insulators disposed at a predetermined position and having a first mounting surface and a female thread portion thereon, a plurality of openings respectively provided in portions to be opposed to the plurality of support insulators, A cylindrical bus conductor having a second mounting surface partially provided in each opening and a second mounting surface facing the first mounting surface of the support insulator and a mounting seat having a through hole; and a mounting seat of the bus conductor. A body portion longer by a predetermined dimension than the thickness, a first male thread portion having a first length for screwing with a female thread portion of the support insulator provided at each end of the body portion, and at least two threads; Screwed in series with two nuts A special bolt having a second male thread portion having a second length, and an engaging flat portion provided on an outer peripheral portion of the body portion for engaging with a screwdriver such as a spanner; A holding plate having a hole through which a second male thread portion of the bolt penetrates is screwed with a second male thread portion of the special bolt, and the holding plate is fixed to a second male thread side end surface of the special bolt. And a nut.

[0006]

Since the mounting seat for the bus conductor is provided partially to the opening, a screwdriver such as a working spanner is inserted into the bus conductor from another portion of the opening, and the work is performed. Check the bolts and nuts from the outside of the busbar for looseness and other mounting conditions. Since the busbar conductor has its mounting seat embedded in a special bolt, a holding plate, a nut, and a support insulator, and is fixed to the support insulator via a screw portion, no tightening torque is applied to the support insulator. When replacing the support insulator due to breakage or the like, the portion of the bus conductor near the support insulator to be replaced is jacked up to the height of the support insulator, and the nut and the holding plate are temporarily removed while being held. Next, two nuts are screwed in series with the second external thread of the special bolt,
By rotating the inner nut with a screw device such as a spanner, the return torque is applied to the special bolt, and the screwing between the special bolt and the female thread portion of the support insulator is loosened.
Further, by applying a return torque to the engaging portion of the nut or the special bolt with a turning screw, the screwing of the special bolt and the female thread portion of the support insulator is released, and the special bolt is removed from the through hole of the mounting seat. . Similarly, all the special bolts used for fixing the supporting insulator to be replaced and the bus conductor are removed. Further, the bolts and the like that fixed the outer cover and the supporting insulator are removed, and the supporting insulator is slid in the horizontal direction to separate from the bus conductor. Then, a support insulator of a sound product is mounted in a procedure reverse to the above procedure, and is fixed to the bus conductor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a bus conductor supporting device according to the present invention will be described with reference to FIGS. FIG. 1 is a front sectional view showing the structure of a bus conductor supporting device according to this embodiment, FIG. 2 is a side sectional view of FIG. 1, FIG. 3 is a partially enlarged sectional view showing details of a portion A in FIG. (a) and (b) are special bolts 8
FIG. 5 is a partially enlarged cross-sectional view showing details of a portion A in the case of replacing the support insulator 4.

1 and 2, a grounded cylindrical jacket 1 is fixed to a support 3 by welding, and a support insulator 4 is fixed to the support 3 by bolts 5 from outside the cover 1. . The bus conductor 2 has a cylindrical shape, and is insulated and supported by the support insulator 4 so that its axis is substantially the same as the axis of the jacket 1 inside the jacket 1. Generally, bus conductor 2
Is about 10 m in length, and one bus conductor 2 is supported by two to four support insulators 4 in the axial direction. The busbar conductor 2 is provided with an opening 6 having, for example, a rectangular projection shape at a portion facing the support insulator 4. Opening 6
A plate-like mounting seat 7 is partially welded to both end surfaces 6a orthogonal to the axis of the bus conductor 2 of FIG. The first mounting surface 4b on the upper part of the support insulator 4 supports the second mounting surface 7b of the mounting seat 7 facing the first mounting surface 4b. Two special bolts 8 are arranged on the inner surface orthogonal to the axis of the bus conductor 2 at positions symmetrical to the axis of the bus conductor 2 for each support insulator 4.

Next, FIG. 3 shows details of the portion A in FIG. FIG. 3 is a partially enlarged cross-sectional view in a plane perpendicular to the axis of the bus conductor 2. In FIG. 3, the mounting seat 7 is a plate having a predetermined thickness, and has a through hole 7a. The special bolt 8 is inserted through the through hole 7a of the mounting seat 7, and its first
Metal burring with external thread 8a embedded in support insulator 4
4a is screwed into the female thread 4c. The holding plate 9 has a through hole 9a, and the second external thread 8b of the special bolt 8 is inserted into the through hole 9a. By screwing the nut 10 to the second male thread 8b of the special bolt 8, the holding plate 9
It is fixed to the end face 8e on the male screw part side.

The details of the special bolt 8 will be described with reference to FIGS. 4 (a) and 4 (b). In each figure, the body 8c is manufactured by machining from a round bar as a material, and is initially substantially columnar to take advantage of the shape of the material. An engaging portion 8d is formed at a portion of the body portion 8c adjacent to the end 8e on the second male screw portion 8b side, and the engaging portions 8d are parallel to each other so as to be easily held by a screw device such as a spanner. It is composed of two surfaces. The length L ₀ of the first male screw portion 8a is screwed into the internal thread portion 4c of the embedded support insulator 4 Metal filler metal 4a, taking into account the fastening strength of the screw or the like, the thread diameter It is set to about 1.5 times as long as. The length L ₁ of the second male screw portion 8b is 2
The nuts must have the necessary length to be screwed in series. By the way, since the height of the nut is generally set to 80 to 80% of the diameter of the screw, in consideration of this, the length L1 of the second external thread portion 8b is set to be at least twice the diameter of the screw. Is set. The length L of the body 8c is set to be slightly larger than the thickness of the mounting seat 7, as is apparent from FIG. That is, the gap between the through hole 7a of the gap 11 and the mounting seat 7 in FIG. 3 and the body 8c of the special bolt 8 is for absorbing thermal expansion and contraction of the bus conductor 2, and by providing these gaps, the bus is provided. The conductor 2 is set so as not to be restrained.

Next, an assembling procedure of this embodiment will be described. The special bolt 8 is a female thread of the support insulator 4 in advance.
4c and is fixed on the first mounting surface 4b.
At this time, the engaging portion 8d of the special bolt 8 is clamped by a screw device such as a spanner, and a tightening torque is applied to this portion. In general,
Since the first mounting surface 4b of the support insulator 4 is coated with a rust-preventive paint, it is necessary to pay attention to the operation of the screw device in order to prevent peeling of the paint. Torso
Since it is provided on the upper part of 8c, the operation with the screw device can be performed relatively easily.

The bus conductor 2 is jacked up in advance in the inside of the jacket 1 at a position higher than the height of the support insulator 4, and then the support insulator 4 to which a predetermined number of special bolts 8 are screwed is removed. It is arranged at a predetermined position inside the jacket 1 and is fixed to the support 3 with bolts 5 from the outside of the jacket 1. Lower the jack to attach the busbar conductor 2
The second mounting surface 7b of the support insulator 4 to the first mounting surface
Place on 4b. At this time, adjustment is made so that the through hole 7a of the mounting seat 7 does not interfere with the special bolt 8.

Next, the holding plate 9 is inserted into the bus conductor 2 from each opening 6 of the bus conductor 2, and the second male thread 8 b of each special bolt 8 is inserted into each through hole 9 a of the holding plate 9. Attach so that it penetrates. Then, insert the nut 10 into each special bolt 8
And the holding plate 9 is fixed to the end surface 8e of the special bolt 8 on the second male screw portion 8b side.
Thus, the bus conductor 2 is fixed to the support insulator 4 and is insulated and supported.

Next, a description will be given of a procedure for replacing the supporting insulator when the supporting insulator 4 is damaged in the bus conductor supporting device already assembled in a power plant or the like. First, the bus conductor 2 is supported by a jack at a height equal to the height of the support insulator 4 near the damaged support insulator 4. Next, the nut 10 and the holding plate 9 on the support insulator 4 are once removed, and then, as shown in FIG.
The two nuts 10 and 10 'are again screwed in series with the second male screw portion 8b. At this time, tightening torques in opposite directions are applied to the respective nuts 10, 10 'to fix the two nuts 10, 10'. Then, when a return torque is applied to the inner nut 10 'by a screwdriver such as a spanner, the screw engagement between the first external thread 8a and the female thread 4c of the support insulator 4 is loosened. By continuing to apply the return torque as it is, the screwing of the first male thread 8a and the female thread 4c of the support insulator 4 is finally released.
Then, the special bolt 8 is taken out from the through hole 7a of the mounting seat 7. After all the special bolts 8 are removed, the bolts 5 (shown in FIG. 1) are removed from the outside of the jacket 1, and the damaged support insulator 4 is moved in the horizontal direction and removed. The removed support insulator 4 is taken out of the jacket 1 from the nearest inspection opening (not shown for obvious reasons), and a sound support insulator 4 is mounted instead in the reverse order to the above procedure.

In the above embodiment, since the second external thread 8b of the special bolt 8 is mounted so as to always exist inside the bus conductor 2, there is no hindrance to the withstand voltage characteristics of the phase separation bus. It is not cool. Further, in the above embodiment, the case where the present invention is applied to a phase separation bus having a cylindrical bus conductor 2 is shown, but the present invention is applied to a phase separation bus having a large-diameter rectangular cylindrical conductor or a hollow large-diameter polygonal conductor. Even in this case, the same effect is obtained. In these cases, one side of the rectangular cylindrical conductor or the polygonal conductor can be used as a substitute for the mounting seat 7. Further, in the above embodiment, the case where two special bolts 8 are arranged symmetrically with respect to the axis of the bus conductor 2 in a plane perpendicular to the axis of the bus conductor 2 for one support insulator 4 is shown. However, the special bolt 8 may be arranged on the inner surface including the shaft, or one or three or more special bolts 8 may be used for one support insulator 4.

[0016]

As described above, according to the present invention, the state of attachment of special bolts and nuts and the looseness thereof can be confirmed from the openings provided in the bus conductor. Also,
There is no direct tightening torque on the support insulator, which reduces the risk of damage to the support insulator during assembly. Further, by screwing two nuts in series with the second male thread portion of the special bolt (double nut), the special bolt can be easily removed from the supporting insulator, and thereby another supporting insulator and its fixing can be achieved. It is possible to remove only the damaged support insulator without removing bolts and the like, and replace it with a sound one.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a configuration of a bus conductor supporting device according to the present invention.

FIG. 2 is a partially cutaway side view of FIG. 1;

FIG. 3 is a partially enlarged front view showing details of a portion A in FIG. 1;
Front view

FIGS. 4A and 4B are a side view and a front view showing details of a special bolt 8;

FIG. 5 is a partially enlarged front sectional view showing details of a portion A when the support insulator 4 is replaced.

FIG. 6 is a side sectional view showing the configuration of a conventional bus conductor supporting device.

FIG. 7 is a partial front sectional view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer jacket 2 Bus conductor 4 Support insulator 6 Opening 7 Mounting seat 8 Special bolt 9 Holding plate 10 Nut

Claims (1)

(57) [Scope of request for utility model registration] 1. A grounded substantially cylindrical jacket; and a first cylindrical member disposed on a vertical plane including an axis of the jacket inside the outer jacket at a predetermined position on the same straight line. A plurality of support insulators each having a mounting surface and a female thread portion; a plurality of openings respectively provided in portions to be opposed to the plurality of support insulators; and a plurality of the support insulators partially provided in the respective openings. A cylindrical busbar conductor having a second mounting surface facing the first mounting surface and a mounting seat having a through hole, a trunk longer by a predetermined dimension than the thickness of the mounting seat of the busconductor, and the trunk A first male thread having a first length for threading with the female thread of the support insulator provided at each end of the support insulator, and a second length for threading in series with at least two nuts. A second external thread portion having
A special bolt provided on an outer peripheral portion of the body portion and having an engaging flat portion for engaging with a screw device such as a spanner; and a holding plate having a hole through which a second male thread portion of the special bolt passes. And a nut which is screwed with a second external thread portion of the special bolt and fixes the holding plate to a second external thread side end surface of the special bolt.