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INTERNAL ARC CLASSIFIED (IAC) PROTECTION SOLUTION FOR SWITCHGEAR VENTILATION

IP.com Disclosure Number: IPCOM000244331D
Publication Date: 2015-Dec-02
Document File: 4 page(s) / 177K

Publishing Venue

The IP.com Prior Art Database

Abstract

An efficient mechanism for a cover to close the ventilation holes of switchgear system instantly when an internal fault occurs is disclosed. The system includes a hinged cover configured to be restrained by a spring mechanism behind the ventilation holes. The cover is kept in open position by the spring and restrained by a side cover position limit plate during normal operation, providing ventilation. When an internal fault occurs in the switchgear, air pressure pushes the cover plate by spring mechanism and the cover plate rotates about the hinge, pushing the spring beyond a dead point, causing it to instantly close, firmly locking the cover against the ventilation holes. Spring mechanism and locking mechanism of the cover ensure firm closure of the ventilation holes immediately, preventing external discharge and ensuring safety for the operators

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 01 of 4

283239     

INTERNAL ARC CLASSIFIED (IAC) PROTECTION SOLUTION FOR SWITCHGEAR VENTILATION

BACKGROUND

This invention relates to a solution for high current switchgear with ventilation holes to protect from internal faults. Generally, it is mandatory for high current switchgear to be provided with ventilation on the door for cooling. When an internal fault occurs, hot gases and particulate exhaust could release through the ventilation openings. This could cause damage to the operator as per accessibility type A in the International Electrotechnical Commission (IEC) standard internal arc class (IAC) test. Current solution for switchgear ventilation introduces forced cooling with a flap assembly or some barrier to block IAC release as shown in FIG. 1. But the flap behind the ventilation holes could not close the ventilation holes immediately and the flap will rebound creating gap, failing to prevent arc release. Therefore there is need for an efficient mechanism for closing the ventilation holes instantly when an internal fault occurs in the switchgear system and ensure safety for the operators.

FIG. 1: Existing flap assembly for closing the ventilation holes

BRIEF DESCRIPTION OF DRAWINGS

The invention discloses an efficient mechanism for closing the ventilation of the high current switchgear to protect from internal faults, wherein:

Fig. 1 illustrates existing flap assembly for closing the ventilation holes of the door in high current switchgear systems.

Fig. 2 illustrates spring mechanism for a cover to close the ventilation holes of the door in high current switchgear system.

Fig. 3 shows working of spring and locking mechanism in the cover.

Fig. 4 illustrates alternative configurations of spring assembly with cover plate.

 


Page 02 of 4

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DETAILED DESCRIPTION

The invention proposes an efficient mechanism for a cover to close the ventilation holes instantly when an internal fault occurs in the switchgear system. The system includes a hinged cover configured to be restrained by a spring mechanism as shown in FIG. 2. The spring mechanism installed in the cover helps in the closure of the ventilation holes instantly and firmly without any gap.

FIG. 2: Spring mechanism for a cover to close the ventilation holes of the door

In FIG. 2, the cover is kept in open position by the spring and restrained by a side cover position limit plate during normal operation. Cool air enters through the enclosure via the ventilation hole from t...