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SHUTTER INTERLOCK FOR SWITCHGEARS

IP.com Disclosure Number: IPCOM000241282D
Publication Date: 2015-Apr-13
Document File: 3 page(s) / 147K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a manual shutter interlock for switchgears. Rotation of shutter actuating arms of the shutter is blocked by a flag at an end of a lever. Advantageously, the interlock described herein, prevents accidental touching of stationary live contacts in a panel.

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This is the abbreviated version, containing approximately 55% of the total text.

Page 01 of 3

SHUTTER INTERLOCK FOR SWITCHGEARS

BACKGROUND

The present invention relates generally to switchgear shutters and more particularly to a flag type manual shutter interlock for switchgears.

Switchgears are used in an electrical power system to control, protect, isolate or de-energize downstream electrical equipment. Switchgears are a combination of electrical disconnects switches, fuses or circuit breakers. Safety of operating and maintenance personnel who may need to enter the switchgear housing is of prime importance.

Generally a shutter means which is usually formed from sheet metal or insulating material is used to close the openings to the insulating tubes when the associated circuit breaker is removed from its normal operating position. Typically, this shutter is activated by the breaker moving in and out of the switchgear compartment.

In conventional switchgear, a shutter can be opened manually. As depicted in Figure 1 below, a bracket in a conventional circuit breaker activates top and bottom shutters to move up and down respectively.

Figure 1


Page 02 of 3

Such manual operation on the switchgear presents potential danger of touching live circuit parts.

It would be desirable to have a technique for safer operation of switchgear shutters.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 depicts a panel with a conventional switchgear shutter.

Figure 2 depicts a panel with a shutter interlock according to an embodiment of the present invention.

DETAILED DESCRIPTION

T...