JP3462073B2 - Bus duct with space heater and space heater wiring method for bus duct - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a space heater-equipped bus duct, and more particularly to a space heater-equipped bus duct and a space heater wiring method for facilitating the wiring of space heater lead wires and the attachment of the space heater in the bus duct. It is a thing.

[0002]

2. Description of the Related Art A considerable temperature rise is observed in a bus duct during conductor energization irrespective of low pressure or high voltage. Therefore, depending on the environment, when the energization is stopped, the temperature inside the bus duct drops sharply and dew condensation occurs in the bus duct. May occur.

Therefore, conventionally, in order to prevent such dew condensation, a plurality of space heaters are provided in the bus duct along the length direction thereof, and the energization of the plurality of space heaters is started at the same time when the energization is stopped. or leave energized constantly space heaters have been made to maintain the temperature in the bus duct above the dew point.

FIGS. 4 and 5 show an example of a conventional low-voltage bus duct equipped with a space heater. According to this example,
The bus duct 1 has a rectangular cross-sectional shape by an upper plate 3 having an inverted U shape whose lower part is opened by an upper plate 3a and both side plates 3b, and a lower plate 4 attached to a lower opening of the upper plate 3. It has a duct casing 2. A strip-shaped conductor 5 is arranged in the duct casing 2.
Are supported by being sandwiched by insulating holders 6 and 7 arranged at predetermined intervals on the upper surface plate 3 and the lower surface plate 4 along the longitudinal direction of the duct casing 2. Space heaters 10 of about 100 to 200 watts are installed in the duct casing 2 along the side plate 3b at intervals of, for example, 2 to 3 m, and power is supplied from the lead wires 11.

Conventionally, in order to wire and install the lead wire 11 and the space heater 10 in the duct casing 2, as shown in FIGS. 6A and 6B, the mounting seats 12 and 13 are attached to the duct casing 2. Was welded to the inside of the side plate 3b. That is, the lead wire 11 is
As shown in (A), the mounting seat 12 welded to the side plate 3b
An electric wire holder fixed to the space by a fixing bolt 16, for example, held by a string 14 made of an insulating material, and the space heater 1
0 is a fixing bolt 1 to the mounting seat 13 welded to the side plate 3b.
It was installed via the terminal block 15 fixed at 7.

[0006]

However, according to such a conventional bus duct 1, it takes a lot of time to manufacture the mounting seats 12 and 13, and the mounting seats 12 and 13 are fixed to the duct casing 2 by welding. However, the work was complicated. Moreover, the mounting seats 12 for the wire retainer 14 are arranged at intervals of 300 to 400 mm, and the space heater mounting seats 13 are arranged at intervals of 2 to 3 m.
However, there is a problem in that it requires a lot of time for the work.

Although the above description has been made in relation to the low-voltage bus duct, the high-voltage bus duct also has the same problem as the low-voltage bus duct.

Accordingly, it is an object of the present invention to wire and install a lead wire and a space heater in a duct casing without the need for a conventionally required mounting seat, and thus welding the mounting seat to the duct casing. A bus duct with a space heater and a space heater wiring method capable of facilitating wiring of a space heater lead wire and mounting of the space heater without needing to improve workability and cost reduction. .

[0009]

The above object can be achieved by a bus duct with a space heater and a space heater wiring method according to the present invention. In summary, the present invention provides a space heater with a plurality of space heaters in a duct casing, and the space heater is supplied with power by a lead wire drawn into the duct casing. An elongated member having a U-shaped cross section along its length and opening into the duct casing
A bus duct with a space heater is provided, in which lead wires are provided along the rail, and space heaters are attached at predetermined intervals along the rail.

According to another aspect of the present invention, (a) a rail is mounted in the duct casing along its length by bolting, and a lead wire is laid along the rail in a recess of the rail to hold the wire. Holding step, (b)
Fixing the mounting plate with bolts at predetermined intervals along the rail, and bolting the terminal block to the mounting plate;
(C) A step of attaching space heaters at predetermined intervals using the terminal block, and thereafter connecting the space heater to lead wires held along the rails. A space heater wiring method is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A bus duct with a space heater and a space heater wiring method according to the present invention will be described below in more detail with reference to the drawings.

1 and 2 show an embodiment of a bus duct 1 with a space heater according to the present invention. According to this embodiment, the space heater-equipped bus duct 1 for low pressure has an inverted U-shaped upper surface plate 3 which is opened downward by an upper plate 3a and both side plates 3b, as in the conventional case, and an upper surface plate. The duct casing 2 has a rectangular cross-section due to the lower plate 4 attached to the lower opening of the duct casing 3. Duct casing 2
A strip-shaped conductor 5 is arranged inside, and the conductor 5 is arranged along the longitudinal direction of the duct casing 2 to include an upper plate 3 and a lower plate 4.
And is supported by being sandwiched by insulating holders 6 and 7 arranged at predetermined intervals.

According to the invention, a rail 21 is arranged in the duct casing 2 along its length. In this embodiment, the rail 21 includes a side plate 21b and a connecting plate 21a, which are open at the upper side, as will be understood with reference to FIG.
Has a U-shaped cross section, and its connecting plate portion 21a is attached to the side plate 3b of the duct casing 2 at a predetermined interval by using bolts (not shown) on the supporting member 20 such as an angle. It is attached.

The lead wire 11 is wired along the rail 21 in the recess of the rail 21, as shown in FIG. 3A, and is like a string (insulation lock) made of a conventionally used insulating material. The electric wire retainer 14 holds the wire in place at a predetermined interval, for example, 300 to 400 mm. In addition, as shown in FIG.
As shown in FIG. 2, the mounting plate 22 is fixed with bolts 23 and nuts 24 at predetermined intervals in the longitudinal direction of the rail, and the terminal block 15 that has been conventionally used is fixed to the mounting plate 22 with bolts 25.
Installed at. As shown in FIG. 1, the space heaters 10 are attached to the rails 21 at predetermined intervals, for example, at intervals of 2 to 3 m, by using the terminal blocks 15. Electric power is supplied to the space heater 10 from a lead wire 11 held along a rail 21.

Therefore, according to the space heater wiring method of the present invention, first, the rail 21 is provided in the duct casing 2 along the lengthwise direction thereof, for example, the bolt is provided via the support tool 20 attached to the duct casing 2. Install by stopping. Then, along the rail 21 thus attached, the lead wire 11 is inserted into the recess of the rail 21.
Wire and hold it with the wire retainer 14. Subsequently, the mounting plate 22 is fixed along the rails 21 at predetermined intervals with the bolts 23 and the nuts 24, and the terminal block 15 is fixed to the mounting plate 22.
Are attached with bolts 25. Next, using the terminal block 15, the space heaters 10 are attached at predetermined intervals,
It is electrically connected to the lead wire 11 arranged along the inside of the rail 21.

Thus, according to the present invention, the rail 21
Mounting seat 12, which has been conventionally required by using
13 is no longer necessary, so that the mounting seats 12 and 13 do not need to be processed, and the mounting seat is not required to be installed in the duct casing 2.
Since a complicated process such as welding is not necessary, the wiring work time can be remarkably shortened, and the cost associated with the space heater wiring can be significantly reduced.

Although the present invention has been described in connection with the low-voltage bus duct in the above embodiment, the present invention can be applied to the high-voltage bus duct as well, and achieves the same effect as the low-voltage bus duct. You can

[0018]

As described above, according to the bus duct with space heater and the space heater wiring method for the bus duct of the present invention, the inside of the duct casing has a U-shaped cross section along its length direction. A rail that is an elongated member that opens to the rail is provided, lead wires are wired along the rail, and space heaters are attached at predetermined intervals along the rail, and at the time of wiring work, first, Mount the rails in the duct casing along its length by bolts, wire the lead wires in the recesses of the rails along the rails and hold them with the wire retainer, and install the mounting plates at predetermined intervals along the rails. Bolt the terminal block to this mounting plate, and then use this terminal block to attach space heaters at specified intervals. Later, this superheater is configured to be connected to the lead wire held along the rail, so a mounting seat that was conventionally required for wiring and installing the lead wire and space heater in the duct casing is required. Therefore, it is not necessary to weld the mounting seat to the duct casing, the wiring of the space heater lead wire and the space heater can be easily mounted, workability is improved, and the cost required for wiring is significantly reduced. can do.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a bus duct with a space heater according to the present invention.

2 is a cross-sectional view taken along line II-II of FIG.

FIG. 3 (A) shows a mode in which a lead wire arranged on a rail is held by an electric wire retainer, and FIG. 3 (B) shows a terminal block bolted to the rail via a mounting plate. Is.

FIG. 4 is a vertical cross-sectional view showing an example of a conventional bus duct with a space heater.

5 is a cross-sectional view taken along line VV of FIG.

FIG. 6 (A) shows a mode in which a lead wire is held by a wire retainer on a mounting seat welded to a duct casing side plate, and FIG. 6 (B) shows a terminal block welded to the duct casing side plate. It is a figure.

[Explanation of symbols]

1 Bus Duct with Space Heater 2 Duct Casing 3 Duct Casing Top Plate 4 Duct Casing Bottom Plate 10 Space Heater 11 Lead Wire 14 Wire Presser 20 Support Plate 21 Rail 22 Mounting Plate

Continuation of the front page (56) References JP-A 1-269631 (JP, A) Actually open 5-18222 (JP, U) Actually open 48-29396 (JP, U) Actually open 1-146704 (JP , U) Actual opening 50-106673 (JP, U) Actual opening 58-105707 (JP, U) Actual opening 61-147534 (JP, U) Actual opening 62-37390 (JP, Y1) Actual opening 3-12005 (JP, Y2) S.K. 62-37388 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 5/06 311

Claims (2)

(57) [Claims] 1. A bus duct with a space heater, wherein a plurality of space heaters are provided in the duct casing, and the space heater is powered by a lead wire drawn through the duct casing. A rail, which is an elongated member having a U-shaped cross section along the direction and opening into the duct casing , is provided, lead wires are wired along the rail, and space heaters are attached at predetermined intervals along the rail. A bus duct with a space heater. 2. A step of: (a) mounting a rail in a duct casing along its length by bolts, wiring a lead wire along the rail in a recess of the rail, and holding the lead wire by a wire retainer; b) fixing the mounting plate along the rail at a predetermined interval with bolts and bolting the terminal block to the mounting plate; (c) using the terminal block to provide a space heater at a predetermined interval. Mounting, and then connecting this superheater to a lead wire held along the inside of the rail, a space heater wiring method for a bus duct.