- Technical Blog From My Notebook

Sunday, January 17, 2016

Open Circuit Characteristics (OCC) of an Alternator

To obtain the open circuit characteristics the machine is driven at rated speed without the load. Readings of the line-to-line voltage are taken for various values of field current. The voltage, except in very low voltage machines, is stepped down by the means of a potential transformer.

Experimental set up-


If not for the magnetic saturation of the iron, the open circuit characteristics would be linear as represented by the air gap line.

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