 Hello friends, I hope all of you are fine. In today’s tutorial, we are gonna have a look at the Phasor Diagrams of a Synchronous Generator and how they describe the different parameters of synchronous generator. The phasor diagram is a very significant factor of the power system analysis. As the output of the synchronous generator is alternating current, so it can easily be explained by the phasor diagrams. If we draw the output voltage and current in such a geometrically way that they show some relation among them, the resultant diagram called a phasor diagram.

In the last tutorial, we discussed the synchronous generator equivalent circuit. If first, you read it then it will be easy to understand the phasor diagrams of the synchronous generator. In today’s post, we will have look at different parameters related to phasor diagram, will learn how to make these diagrams. So, let’s get started with the phasor diagram of the synchronous generator.

#### Phasor Diagram of a Synchronous Generator

• In the electrical power system, there are three main types of load first one is resistive, the second one is capacitive and the third one is inductive.
• We will connect all these three loads with the synchronous  generator and will see their effect and will draw their phasor diagram.

#### Phasor Diagram of a Synchronous Generator at Unity P.F

Vø= EA – jXsIA– RAIA

• We can observe from the above-given equation that internal generated voltage (EA) are will be equal to the phase or terminal voltage of the generator if we deduct the voltage loss due to armature resistance and the synchronous reactance from it.
• All these parameters and their facts are shown in an above-given diagram.
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#### Phasor Diagram of a Synchronous Generator at lagging and leading P.F

EA = Køw

• In this equation, EA is  internal generated voltage.
• ‘K’ is constant.
• ‘∅’ is flux.
• ‘w’ is speed of rotation of rotor.
• In this equation, ‘w’ should be non-variant to keep the frequency constant.
• For the given amount of the field current at rotor and current consumed by load, the magnitude of the phase voltage (Vø) will be less for inductive load and high for the capacitive load.
• In all synchronous machines either it is motor or generator, the value of the synchronous reactance (Xs) is high than the armature windings resistance (RA), so sometimes RA is ignored for quality observation of the voltage changings.
• But in case of different mathematical problems, RA should be considered.
• In real synchronous machines, the synchronous reactance is normally much larger than the winding resistance RA, so RA is often neglected in the qualitative study of voltage variations. For accurate numerical results, RA must be considered.

You can also read some related topics to synchronous generator that are listed here.

Introduction to Synchronous Generator

Synchronous Generator Equivalent Circuit

Synchronous Generator Power and Torque

Synchronous Generator Parameters

Synchronous Generator Operating Alone

Synchronous Generator Parallel Operation

Synchronous Generator parallel with Large Power system

Synchronous Generator Parallel with same Size Generator

Synchronous Generator Ratings

Synchronous Generator Capability Curves

Synchronous Generator Transients

This is the complete tutorial about phasor diagram of the synchronous generator if you have any queries ask in comments. See you in the next tutorial Power and Torque in Synchronous Generator. Have a good day.

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