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COMPACT DRAW OUT DESIGN FOR SURGE PROTECTIVE DEVICE (SPD) WITHOUT DE-ENERGIZING THE PROTECTED CIRCUITS

IP.com Disclosure Number: IPCOM000187653D
Publication Date: 2009-Sep-14
Document File: 9 page(s) / 272K

Publishing Venue

The IP.com Prior Art Database

Abstract

A compact draw out design for surge protective device (SPD) without de-energizing the protected circuits for providing uninterrupted power to mission critical facilities is disclosed. The design consists of an enclosure, which houses a SPD and a disconnecting means, such as a switch or a circuit breaker and incorporates both the mounting features either external to the protected equipment or as an integral installation internal to the protected equipment. The enclosure is equipped with a hinged lid to provide access to the replaceable SPD and to prevent access to the SPD and means of disconnect when the lid is closed. The compact size which includes the SPD and disconnecting means in space-efficient package and no requirement of additional dedicated disconnect as unit may be direct-connected to bus structure helps in initial system cost and space benefits and thus helping in improved performance.

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COMPACT DRAW OUT DESIGN FOR SURGE PROTECTIVE DEVICE (SPD) WITHOUT DE-ENERGIZING THE PROTECTED CIRCUITS

 

BACKGROUND

The present invention relates generally to the field of electrical devices and, more specifically, to a compact draw out design for surge protective device (SPD) without de-energizing the protected circuits for providing uninterrupted power to mission critical facilities. 

In general, surge protective devices are utilized to protect various electrical appliances / devices from transient voltages.  During normal operation, the surge protective devices do not interfere with the flow of electrical current from a supply source to a number of loads or electrical appliances connected to the power supply.  If the voltage level rises above a specified threshold level resulting in an unacceptably high current level, then the surge protective devices divert the high current away from the load.  The cost associated with disconnecting power from the protected circuits are generally intolerable in certain electrical system installations providing uninterrupted power to mission critical facilities, such as hospitals, data centers, and many more.

There exists various conventional designs, but such designs require either connection to the power bus through a separate disconnect means, such as a circuit breaker or de-energizing the protected circuits to permit replacement of a faulted Surge Protective Device (SPD).  Both the limitations of the conventional designs are undesirable from the point of view of performance, cost and operational flexibility.  The physical space required for the external enclosure must be accommodated within the electrical equipment room, where space is typically at a premium. 

Therefore, there exists a need in the art of a novel compact draw out design for surge protective device (SPD) without de-energizing the protected circuits for providing uninterrupted power to mission critical facilities. 

BRIEF DESCRIPTION OF DRAWINGS

Fig. 1 illustrates an assembly with hinged lid in closed position in accordance with the present invention.

Fig. 2 illustrates an assembly with the hinged lid in open position in accordance with the present invention.

Fig. 3 illustrates the hinged lid in open position for taking out a surge protective device (SPD) in accordance with the present invention.

Fig. 4 illustrates a front view of the assembly in accordance with the present invention.

Fig. 5 illustrates an exploded view of the assembly in accordance with the present invention.

DETAILED DESCRIPTION

Main elements of the design include a grounded enclosure 101, a surge protective device (SPD) 102, a disconnect switch 103, a hinged lid 104, a disconnect switch handle 105 incorporating an interlocking design feature, a disconnect switch shaft 106 incorporating an interlocking design feature, a partition p...