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Analysis and Verification of Synchronous Machine Characteristics: EMF Method and Phasor Diagrams

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           CO:1 Determining Synchronous Impedance: EMF Method Explained with Examples Introduction The Electromotive Force (EMF) Method, also known as the Synchronous Impedance Method, is used to determine the synchronous impedance () of an alternator. It involves performing Open Circuit Test (OCT) and Short Circuit Test (SCT) on a synchronous machine and using the test data to compute synchronous impedance. This method is widely used for voltage regulation calculations and machine performance analysis.                                     Steps to Determine Synchronous Impedance Using the EMF Method 1. Open Circuit Test (OCT) The alternator is driven at rated synchronous speed by a prime mover. The field winding is excited, and the open circuit voltage (Voc) is measured at different field currents. The results are plotted as an Open Circuit Characteristic (OCC) c...