JPS62135209A - 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. 6. Circuit breaker room.

A space heater is usually installed in the load cable room to prevent insulation deterioration due to condensation during no-load or light-load operation. It is desirable that space heaters can be maintained and replaced safely and easily.

FIG. 5 shows a closed electrical panel with a conventional space heater arrangement. In the figure, l is a closed switchboard, 2 is a busbar room, 3 is a breaker room, 4 is a load cable room, and the breaker room 3 houses a draw-out type circuit breaker 5, and the load cable room 4 houses a load cable 6. It is connected to the CT bushing 7 via a connection bar 8. Cooling air is introduced into the disconnector chamber 3 by an air passage 9 from an intake port 10 on the back side of the panel. A space heater 11 is attached to the air outlet in the four disconnection chambers 3, and a space heater 712 is attached to the load cable chamber 4.

With this structure, the space heater 11 in the disconnector room 3 can be safely maintained or replaced by pulling out the circuit breaker, and in some cases, maintenance can be performed more safely than in the air passage 9 without power outage, but the load cable Maintenance of the space heater 12 in the room 4 requires a person to open the back cover of the stove and enter the panel, so the power must be shut off. Furthermore, even if the circuit breaker 5 is pulled out, the load cable 6 and the connection par 8
Since there is a residual charge in the conductor, the conductor must be grounded, which increases downtime, resulting in large losses.Also, maintenance work in narrow spaces inside the panel is not easy.

[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 switchboard which eliminates the above-mentioned drawbacks and allows maintenance and replacement to be carried out safely and easily from outside the panel without causing a power outage.

[Key points of the invention]

The present invention provides an opening A'7 in the rear wall or side wall of a closed switchboard.
Cover the opening with a cover, attach a space heater to a mounting plate that can slide freely on the bottom plate of the panel or horizontal partition plate, and wire it to this heater with flexible electric wires.
The heater is intended to be pulled out of the panel together with the mounting plate through the opening for maintenance.

[Embodiments of the invention]

FIGS. 1 and 2 show a closed switchboard having a space heater according to an embodiment of the present invention, and parts designated by the same reference numerals as in FIG. 5 are the same parts. An intake port 10 is provided on the back side of an air passage 9 leading to a door disconnection chamber 3 of a closed switchboard 1, and is closed by four windows 13. An opening 14 is provided on the back side of the load cable chamber 4 and covered with a removable cover 15. A mounting plate 16 that can be pulled out from the air intake port 10 is slidably attached to the bottom of the panel in the air passage 9, and a space heater 11 for the circuit breaker room is mounted on the mounting plate 16. Further, in the load cable room 4, a mounting plate 17 that can be pulled out from the opening 14 is slidably attached to a horizontal partition plate between the air passage 9 and the load cable room 4.
A space heater 12 is mounted on the mounting plate 17. The space heaters 11 and 12 are wired through a wiring duct 19 using flexible electric wires 18. Armor window 13. When the cover 15 is removed, the space heaters 11 and 12 can be pulled out of the panel together with the mounting plates 16 and 17, so maintenance and replacement can be performed safely and easily outside the panel. A load cable 6 stands up on the back of the panel, and if this becomes an obstacle, an opening can be provided between the cables to divide the space heater.

3 and 4 show a closed power distribution board having a space heater device according to another embodiment of the present invention, in which a pull-out cover 20 is shown covering an opening 14 provided at the back of the load cable chamber 4 of the closed power distribution board. The space heater 12 is fixed to the cover 20 and wired by the flexible ff1M1B. A wire mesh 21 is placed around the space heater 12.
is fixedly installed inside the panel to ensure safety when the cover is pulled out. If you pull out the cover 20, the space heater 1
2 allows safe and easy maintenance and replacement outside the panel. For a single switchboard and both end panels of a row of panels, a hole is provided in the side wall to install a space heater that can be pulled out from the side for maintenance.

〔Effect of the invention〕

According to the present invention, the space heater of a closed switchboard can be maintained and replaced safely and easily outside the panel without causing a power outage to the panel, resulting in improved maintainability and economic efficiency.

[Brief explanation of drawings]

W, Figure 1 is a partial rear view of a closed switchboard having a space heater device according to an embodiment of the present invention, Figure 2 is a partial side sectional view of Figure 1, and Figure 3 is a space heater according to another embodiment of the present invention. FIG. 4 is a partial side sectional view of FIG. 3, and FIG. 5 is a side sectional view of an enclosed electrical panel with a conventional space heater device. l; Closed switchboard, 3; Circuit breaker room, 4; Fault cable room,
6: Load cable, 7: CT bushing. 9 Near road, 10: Inlet, 11, 12: Space heater, 13: Armor window, 14: Opening, 15: Cover. 16.17;, Mounting plate, 18; Town bending wire/gland, 19; Arrangement 1 AI' squirrel, 2 n: Drawer vertical bar Ritomoku 3rd figure, 4th figure

Claims (1)

[Scope of Claims] 1) In a closed power distribution board having a space heater in a partitioned section, an opening is provided in the outer wall, the opening is covered with a removable cover, and the cover is slidable on the bottom plate of the panel or the horizontal partition plate. A space heater device for a closed switchboard, characterized in that a space heater is fixed to a mounting plate that can be attached to a mounting plate and pulled out from the opening, and that wiring is connected to the space heater from inside the panel using flexible electric wires. 2) A space heater device for a closed switchboard according to claim 1, wherein the cover is of a drawer type and a space heater is attached to the cover.