What is the synchronous impedance?

The synchronous impedance may be defined as the vector sum of the armature resistance and synchronous reactance. It is denoted as Z s.

What is the purpose of determining the synchronous impedance of an alternator?

The synchronous impedance method or EMF method is used to determine the voltage regulation of the larger alternators. The synchronous impedance method is based on the concept of replacing the effect of armature reaction by an imaginary reactance.

What is synchronous reactance of an alternator?

Synchronous reactance (Xs): It is the imaginary reactance employed to account for the voltage effects in the armature circuit produced by the actual armature leakage reactance and by the change in the air gap flux caused by the armature reaction.

What is meant by synchronous alternator?

Definition: The synchronous generator or alternator is an electrical machine that converts the mechanical power from a prime mover into an AC electrical power at a particular voltage and frequency. The synchronous motor always runs at a constant speed called synchronous speed.

How do you find the synchronous impedance of an alternator?

Calculation of Synchronous Impedance Determine the value of short circuit current Isc and gives the rated alternator voltage per phase. The synchronous impedance ZS will then be equal to the open-circuit voltage divided by the short circuit current at that field current which gives the rated EMF per phase.

What is EMF equation of alternator?

V = 4.44 Kf KC KD f ΦT Volts. V = Actual generated Voltage per phase. KC = Coil Span Factor or Pitch Factor. KD = Distribution Factor. Kf = Form Factor.

What is synchronous impedance and reactance?

The synchronous impedance (ZS) is an imaginary impedance employed to account for the voltage effects in the armature circuit of the alternator, which is produced by the actual armature resistance, the actual armature leakage reactance, and the effect of the armature reaction.

What is synchronous reactance for synchronous machine?

As described in the armature winding notes, synchronous reactance is a combination of armature winding leakage reactance and a reactance used to represent armature reaction. The synchronous machine tests give the induced voltage and the current when armature reaction is greatest, for a range of field current values.

What are the two main types of alternators?

From this standpoint, there are two types of alternators: the revolving armature type and the revolving field type. The revolving armature alternator is similar in construction to the dc generator, in that the armature rotates through a stationary magnetic field.

What do you mean by synchronous reactance explain the term synchronous impedance of an alternator?

The synchronous impedance (ZS) is an imaginary impedance employed to account for the voltage effects in the armature circuit of the alternator, which is produced by the actual armature resistance, the actual armature leakage reactance, and the effect of the armature reaction. Manish Kumar Saini.

What is pitch factor in alternator?

Definition of pitch factor : the ratio of the voltage induced in a short-pitch winding to the voltage that would be induced if the winding were full pitch.