JPS62135208A - Space heater for enclosed switchboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a space heater device installed in a closed power distribution board.

[Prior art and its problems]

The closed switchboard is divided into sections such as the bus room, circuit breaker room, and load cable room, so that even if a short circuit occurs in any one section, it will not affect other sections as much as possible. . Usually, a space is provided in the circuit breaker room and the load cable room to prevent deterioration of insulation due to condensation that occurs during no-load or light-load operation. It is desirable that space heaters be able to be maintained, inspected, and replaced safely and reliably.

FIG. 9 shows a closed switchboard with a conventional space heater. In the figure, l is a closed switchboard, 2 is a bus room, 3 is a circuit breaker room, and 4 is a load cable room.The circuit breaker room 3 houses a draw-out type circuit breaker 5, and the load cable room 4 stores a load cable 6. It is connected to the CT bushing 7 via a connection bar 8. The load cable 6 may rise from an underfloor duct or may be drawn in from above through the ceiling of the panel. Cooling air is introduced into the circuit breaker chamber 3 by an air passage 9 from an intake port 10 on the back side of the panel. A space heater 11 is installed at the air outlet in the circuit breaker room 3, and a space heater 12 is installed in the load cable room 4.

With this structure, when the circuit breaker 5 is pulled out, the space heater 11 in the circuit breaker room 3 can be maintained and replaced safely because the circuit breaker room 3 becomes a safety zone.In some cases, maintenance can be performed from the air passage in the safety zone. , space heater 1 in load cable room 4
Maintenance in step 2 requires a person to open the back cover of the panel and enter the panel, so the power must be shut off. Since electric charge remains on the bar 8, it is a dangerous area, and the conductor must be grounded, resulting in large losses due to prolonged power outage time, and maintenance work inside a narrow panel is not easy. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a space heater device for a closed power distribution board which eliminates the above-mentioned drawbacks and allows safe and easy maintenance, inspection, and replacement without causing a power outage to the board.

[Summary of the Invention] The present invention provides a hole in the partition wall between the safety section of the board or the outside air and the dangerous section, and a hole is provided in the partition wall that is movable or
A space heater that is removably attached and looks into the dangerous area is attached to the cover that closes the hole, either directly or through a mounting plate, and the space heater is wired from inside the panel using flexible wires. .

[Embodiments of the invention]

FIG. 1 shows a closed switchboard having a space heater device according to an embodiment of the present invention, and the same parts as in FIG. 9 are denoted by the same reference numerals. A space heater 11 is provided in the circuit breaker room 3 of the closed switchboard 1 at the connection portion of the air passage 9, and a space heater 12 of the load cable room 4 is also provided to protrude into the air passage 9. A hole 13 is provided in the partition wall between the load cable room 4 and the air passage 9, and a cover 14 that covers this hole and is rotatably attached by a hinge projects into the air passage 9. A space heater is attached to the hole 13, and a wire mesh is stretched over the hole 13. As shown in FIG. 2, the space heater 12 is attached to a recessed portion of a boat-shaped cover 14 and wired with flexible electric wires 15. The cover 14 is rotatably attached to the lower surface of the partition wall with a hinge 16, and is fixed from inside the air passage 9 with screws. Therefore, the load cable chamber 4 is heated by the heater 12 through the hole 13. When the mounting screws of the cover 14 are removed, the cover 14 hangs down into the air passage 9 as shown by the chain line in FIG. 1, and maintenance and inspection can be easily performed from the air passage entrance.

3 and 4 show a space heater device according to another embodiment of the present invention, in which the heater 12 is connected to a hole 13 in a partition wall.
It is fixed to a mounting plate 18 which rotates by a shaft 17 passed through it, is wired with a flexible electric wire 15, and rotates 180 degrees. At all times, the heater 12 is fixed to the partition wall by the nozomi fixing fittings 19 facing the load cable room 4, and the flexible electric wires 15
The wiring is tough! - Although the heater 12 is wired from 20, the heater 12 rotates 180 degrees and looks into the air passage 9, making it easy to maintain and replace the heater from inside the air passage.

5 and 6 further show a space heater device according to another embodiment of the present invention, in which a hole 21 is provided on the back side of the load cable chamber 4, and a cover 22 covering this hole 21 is attached by a hinge 23. The cover 22 is attached so that it can be opened and closed freely.
A space heater 12 is attached to a mounting plate 24 attached at right angles to the inside of the space heater 12 , and the heater 12 is wired with flexible electric wires 15 . When the cover 22 is opened, the heater 12 comes out of the panel, so maintenance and replacement of the heater can be easily performed outside the panel. However, in this case, it cannot be used when the load cable rises from below and touches the back of the load cable block.
Applicable only if the load cable is pulled upwards.

7 and 8 show a space heater device according to another embodiment of the present invention, in which a removable cover 25 is attached to cover a hole 21 provided on the back side of the load cable chamber 4. Mounting plate 2 provided perpendicularly to the cover 25
A space heater 12 is attached to 6 and wired with a flexible wire (Mis). If the cover 25 is removed, the heater 12 can be maintained or replaced outside the panel, but this is also limited to cases where the load cable is drawn out upward. However, by providing a hole in the side wall of the load cable room for a single switchboard or a switchboard at both ends of a row of panels, a space heater that can be maintained externally can be installed with this structure.

〔Effect of the invention〕

According to the present invention, a space heater installed in a dangerous section of a closed switchboard can be safely and easily maintained without causing a power outage to the panel.
Since replacement can be performed, there is an effect of improving maintainability 3 and economic efficiency.

[Brief explanation of drawings]

Fig. M1 is a sectional view of a closed switchboard having a space heater device according to an embodiment of the present invention, Fig. 2 is a front view of the space heater device of Fig. 1, and Fig. 3 is a space heater device according to another embodiment of the present invention. FIG. 4 is a plan view taken along the line IV-IV in FIG. 3, FIG. 6 is a partial side sectional view of FIG. 5, FIG. 7 is a partial rear view of a closed switchboard having a space heater device according to another embodiment of the present invention, and FIG. 8 is a partial side sectional view of FIG. 7.
FIG. 9 is a sectional view of a closed switchboard with a conventional space heater device. 1: Closed switchboard, 3: Circuit breaker display, 4: Negative stress cable room,
9: Air duct, 11, 12 Ni space heater, 13: Extraction hole,
14: Cover, 15: Flexible wire, ]6: Hinge, 17:
Shaft, 18: Mounting plate, 19: Fixing bracket, 20: Wiring duct, 21: Hole, 22: Cover, 23: Hinge, 24: Mounting plate, 25: Fig. 2 Fig. 3 Fig. 4 Fig. 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1) In a closed switchboard that has a space heater in a partitioned compartment, a hole is provided in the partition wall between the safety zone or the outside air and the dangerous zone, and a cover movably attached to this partition wall is fixed by closing the hole. A space heater device for a closed switchboard, characterized in that a space heater that looks into a hazardous area is attached to the cover directly or through a mounting plate, and wiring is connected to the space heater from inside the panel using flexible electric wires.