JPS59188306A - 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 [Field of Application of the Invention] The present invention particularly relates to a power distribution board with an improved fireproof structure for control lines connecting electrical devices.

[Background of the invention]

Switchboards such as motor control centers and closed switchboards house electrical equipment such as switches, detectors, current transformers, meters, and the like. Each electrical device is connected to the control unit via a control line. The control unit is provided in the switchboard.

Several dozen control lines are used. therefore,
If the electrical room housing electrical equipment is composed of multiple upper and lower electrical rooms, the number of control lines may vary from several tens to several tens.
Increases to 0. For this reason, several hundred control lines are bundled to form the east line, and then wired to each electrical room along the east line.

For example, after wiring part of the east line to the upper electrical room, the remaining wiring is routed to the lower electrical room.

However, according to this wiring configuration, a short circuit accident occurs in the switchboard, and an arc occurs. The control line near the arc is
As soon as the combustible material burns, a protective circuit breaker operates within a few seconds and the arc is extinguished.

However, the combustible material on the control lines continues to burn, and the fire spreads through the control lines into the switchboard, potentially causing a secondary disaster.

[Purpose of the invention]

An object of the present invention is to provide a power distribution board that prevents secondary disasters caused by fires in control lines.

[Summary of the invention]

In order to achieve this objective, the control line of the present invention is inserted through the vertical support of the switchboard and connected to each electrical device, and the vertical support is provided with a means to reduce air circulation. Makes it difficult to burn.

[Embodiments of the invention]

Hereinafter, an embodiment of the present invention will be explained based on the closed switchboard shown in FIGS. 1 and 2. Three left and right vertical columns IA to IC are arranged in the horizontal direction. The distribution box 3 is formed by welding an outer cover, such as a steel plate, to the back, upper and lower ends of these vertical supports. Attach bulkhead plates 4°5 to the corresponding surfaces of the vertical supports IB and IC to form three electrical rooms 6, 7.8.
form. The load side cable 9 passes through the zero-phase current transformer 10 in the rear electrical room 6 and the current transformer 11 in the intermediate electrical room 7,
It is connected to one end of a disconnector 12 attached to the partition plate 5.

A three-phase power supply bus 13 in the intermediate electrical room is connected to one end of an upper disconnecting section 15 via a conductor 14. The other ends of these disconnecting sections 12.15 are about to be connected to a draw-out electrical device, such as a circuit breaker 16. The breaker 16 is located in the front electrical room 8.
It is opened and closed by a rotatable door 17 provided at the end to enter and exit the front electrical room 8, and to be electrically connected to and separated from the disconnection section 12.15. The door 17 has meters 18 such as a wattmeter and an ammeter on the top.
is installed.

The control room 20 is established on the ceiling surface 21. Control unit 20
2 on the left and right of the ceiling surface 21 between and each vertical support IA to IC.
A horizontal duct 22 of the book is formed.

The horizontal duct 22 communicates with the interior of the vertical columns IA-IC. The inside of the vertical columns IA to IC is referred to as a vertical duct 23. The vertical duct 23 is connected to electrical equipment such as a zero-phase AC 10
．． Openings are formed in the surfaces corresponding to the alternating current generator 11 and the breaker 16, and the openings are closed by a lid 27. The relay terminal 24 installed inside the control room 20 connects several hundred control wires 2.
5 is connected. A control line 25 is disposed in each horizontal duct 22 and each vertical duct 23 and is connected to the zero-phase current transformer 10 and current transformer 11 and the secondary control disconnection section 26 of the breaker 16.

With this configuration, if an arc occurs near the disconnect, the control line 25 is protected by the vertical duct 23, and the air from the vertical duct 23 is prevented from rising by the horizontal duct 22, making it difficult to burn out. . Even if it were to burn out, it would only be part of the vertical duct 23 and not the horizontal duct 22, so
Secondary disasters can be prevented. Also, vertical duct 2
If part 301 is repaired, the stopped state will immediately return to the operating state, and the downtime will be short and the operation can be started immediately, increasing reliability.

In the above, a vertical duct and a horizontal duct are combined, and the horizontal duct suppresses air rising from the vertical duct. A means such as a lid, baffle plate, etc. may be provided.

〔Effect of the invention〕

As described above, according to the switchboard of the present invention, secondary damage to control lines can be prevented.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a closed switchboard that is an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line x-rrH in FIG. 1.

Claims (1)

[Scope of Claims] 1. A power distribution box is formed by providing an outer covering on a vertical support, electrical equipment is housed in the electrical equipment box, and the electrical equipment and a control unit are connected by a control line. A switchboard characterized in that a part of a vertical duct surrounding a line is provided with means for preventing air from rising in the vertical duct. 2. Claim 1, characterized in that a control line is arranged in a vertical duct formed in a vertical column, and a means is provided for preventing air from flowing upward in the vertical duct.
Switchboard as described in section.