Enclosed switchboard

Abstract

The present invention discloses an enclosed switchboard (1) in which the inside of a housing (2) is partitioned into a plurality of compartments (a breaker compartment (3), a bus compartment (4), and a cable compartment (5)). A chamber (8) for alleviating arc-gas dispersion / pressure discharge is arranged above the breaker compartment (3), the bus compartment (4), and the cable compartment (5); and exhaust ducts (9, 10, 11) each of which communicates with the chamber (8) for alleviating arc-gas dispersion / pressure discharge are provided in ceiling sections of the breaker compartment (3), the bus compartment (4), and the cable compartment (5). Flappers (12, 13, 14) are provided in the upper-end sections of the exhaust ducts (9, 10, 11), and a pressure-alleviation shield tank (15) is provided in an opening section (8a) formed in the upper section of the chamber (8) for alleviating arc-gas dispersion / pressure discharge. Ventilation sections (12a, 13a, 14a) for providing communication between the exhaust ducts (9, 10, 11) and the chamber (8) for alleviating arc-gas dispersion / pressure discharge are formed on a primary surface of the flappers (12, 13, 14), and mesh members (12b, 13b, 14b) are provided in the ventilation sections (12a, 13a, 14a).

Description

technical field [0001] The present invention relates to a closed switchboard in which main circuit parts and the like for disconnecting a bus bar are accommodated in a frame, and more specifically relates to a pressure relief structure when an internal short circuit accident or the like occurs. Background technique [0002] The enclosed switchboard has a structure in which a grounded metal box is divided into several compartments, and main circuit components such as circuit breakers, bus bars, and connecting conductors are accommodated in each compartment. [0003] When an internal arc accident accompanied by arcing due to a short-circuit accident or the like occurs in each compartment, the internal pressure of the compartment increases excessively, and arc gas may be ejected from the frame, door, monitoring window, and the like. Therefore, for example, in closed switchboards such as switchgear, pressure relief baffles are provided in each compartment to suppress excessive p...

AI Technical Summary

Problems solved by technology

However, when the amount of gas released from the pressure relief damper is suppressed in order to reduce the pressure of the released gas, there is a possibility that the pressure in the compartment will rise and the gas may be ejected from the frame, door, monitoring window, etc.

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