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Efficiently drive solenoid coils in switchgear apps

Posted: 11 Mar 2014 ?? ?Print Version ?Bookmark and Share

Keywords:power systems? over-currents? over-voltages? switchgear? coil energisation?

One of the chief objectives of all power systems is to maintain a very high level of continuity of service and, when intolerable conditions occur, to minimise their extent and the outage time. Loss of power, voltage dips, over-currents, and over-voltages will occur because it is impossible to avoid the consequences of natural events, physical accidents, equipment failure, or misoperation owing to human error. A combination of devices used to protect electrical equipment from these events is known as switchgear. Solenoids and relays are integral parts of any switchgear equipment, as they connect/disconnect the mains to/from the protected equipment through coil energisation and contacts. This article touches upon the characteristics of solenoid coils typically found in relays, contactors, and valves. It also covers methods of driving them and explains a trend in efficient driving. This article also shows some example switchgear application circuits.

View the PDF document for more information.

Originally published by Texas Instruments at as "Driving solenoid coils efficiently in switchgear applications".

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