Phasor Diagrams of Salient Pole Synchronous Generator — Lesson 10

This lesson covers the intricate details of a salient pole synchronous machine. It explains the equivalent circuit, terminal voltage, armature current, and induced EMF. The lesson also discusses the importance of two reactances in a synchronous machine and how to calculate the power expression of a salient pole synchronous machine. It further elaborates on how to draw the phasor diagram correctly, which is crucial for problem-solving. The lesson also explains the difference between a generator mode and a motor mode in a salient pole synchronous machine. For instance, in a generator mode, the terminal voltage will always be known, while in a motor mode, the terminal voltage will always lead the EF.

Video Highlights

01:33 - Calculation of power expression
05:39 - Explanation of lagging power factor in generator mode
13:58 - Explanation of leading power factor in generator mode
20:42 - Explanation of lagging power factor in motor mode
27:17 - Explanation of leading power factor in motor mode

Key Takeaways

- In a salient pole synchronous machine, two reactances are of importance: XDX and RA.
- The power expression of a salient pole synchronous machine can be calculated considering it to be in a generator mode.
- Drawing the phasor diagram correctly is crucial for problem-solving in a salient pole synchronous machine.
- In a generator mode, the terminal voltage will always be known, while in a motor mode, the terminal voltage will always lead the EF.
- In a generator mode, the machine is overexcited at lagging power factor and underexcited at leading power factor.