This lesson covers the operations of a synchronous machine, focusing on the effects of varying excitation and the role of the phasor diagram. It explains how the computation of a synchronous machine becomes simpler with a scientific calculator. The lesson also discusses the properties of a triangle in relation to the phasor diagram and the impact of neglecting RA. It further explores the concept of over-excitation and under-excitation, the expression of power, and the effect of variation of excitation on a synchronous machine. The lesson concludes with an explanation of how to control the operation of a generator by simply controlling the field current.

- The phasor diagram plays a crucial role in understanding the operations of a synchronous machine.
- Over-excitation and under-excitation are important concepts in the operation of a synchronous machine.
- The variation of excitation has a significant impact on the operation of a synchronous machine.
- The field current can be controlled to manage the operation of a generator, allowing it to operate at lagging, leading, or unity power factor.

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