 Hello friends, I hope all of you are fine. In today’s tutorial, we are gonna have a look at the Power and Torque in Synchronous Generator and their relationship. The synchronous generator is an apparatus that alters mechanical energy into electrical energy. To move its shaft there are many sources like steam turbines, petrol engines or water turbines that provided mechanical energy to the generator. These sources of mechanical power are named as a prime mover.

It does not matter which prime mover we are using; the main thing is that it should rotate rotor at the constant speed irrespective of the variation in the power demand. If prime mover does not deliver the continuous speed, then the frequency of the power generated by the generator will not be same. In today’s post, we will have a look at relation between torque and power of the synchronous generator. so let’s get started with the power and torque in synchronous generator.

#### Power and Torque in Synchronous Generator

Pin = Tappwm

• Whereas, this input power converted to the electric is given here.

Pcon = Tindwm

Pcon = 3EAIAcosγ

• In this equation, the EA is the internal generated voltage of the generator and IA is the armature current, γ  is the angle between them.
• The power that does not convert into the electric energy wasted in the form of core losses that are eddy current and hysteresis loss, iron loss, windage and friction losses.

#### Power of the Synchronous Generator

• The out power of the generator that is electrical power can be written as.

Pout =√3 VTIL Cosø

• It can be written in phase form.

Pout =3 VøIA Cosø—-(1)

• The reactive power of the generator can be defined as

Qout =√3 VTIL Sinø

• It can also write in phase form.

Qout =3 VøIA Sinø

• As the Xs>>RA, so if we neglected the armature resistance (RA) then a very valuable expression can b finds to define the Pout of the synchronous generator.
• To find this expression we study the given phasor diagram. • It is the simple phasor diagram of the generator without the armature resistance.
• From a diagram, you can see that the bc portion has the value of EAsinor XsIAcosø.
• so, we have

IAcosø = EAsinδ/Xs

• If we put this expression in the equation (1) then we have.

P=3 Vø EAsinδ/Xs——- (2)

• As there is no resistance in the equation (2) so there is no loss in the generator and this equation is for input and the output of the generator.
• From equation (2) we can observe that the output power of the synchronous generator depends on the angle (δ) among the internal generated voltage EA and the phase (terminal) voltage of the generator.
• The angle (δ) is also called the torque angle of the synchronous generator.
• The extreme power that can generator produced will be given when the value of torque angle (δ) is ninety degrees.
• When δ =900, sin =1, so the power will be.

Pmax =3VøEA/Xs —- (3)

• The maximum power given in this equation is known as the static stability limit of the generator.
• Usually, practically no generator reaches this limit.
• If we observe given below equation again.

Pout =3 VøIA Cosø—-(1)

Qout =3 VøIA Sinø

P=3 Vø EAsinδ/Xs——- (2)

• Let’s suppose that the Vø in these three equations is constant than the outputs of the active powers are directly proportionate to the IA Cosø and the EA Sinø and the reactive power (Q) is proportionate to the IA Sinø.
• These factors are beneficial for the construction of the phasor diagram of the generator when the load varies.

#### Torque in Synchronous Generator

• As we know that the torque in the synchronous machine is given as.

Tind =KBR x BS

Tind =KBR x Bnet—-(d)

• The magnitude of the equation (d) can be written as.

Tind =KBRBnetsinδ

• In this equation the δ is the angle among the field of the rotor (BR) and the net field of the generator (Bnet), it is known as the torque angle.
• Another equation for the torque can be calculated by this equation.

P=3 Vø EAsinδ/Xs

• As we know that the converted power (Pconv) = Tindwm, so the induced torque of the synchronous generator is.

Tind= 3 Vø EAsinδ/wmXs ——(f)

• Equationf’ gives the value of the torque in form of electric numbers but given below equation gives the torque in the form of magnetic terms.

Tind =KBRBnetsinδ

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

Introduction to Synchronous Generator

Synchronous Generator Equivalent Circuit

Synchronous Generator Phasor Diagram

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

That is the complete article on power and torque of synchronous generator if you want to know something more ask in comments. See you in the next tutorial Synchronous Generator Parameter.

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