What is the angle between the induced voltage and the armature voltage of salient pole synchronous machine?
What is the angle between the induced voltage and the armature voltage of salient pole synchronous machine?
it is seen that the vector difference of Eb and V is zero, so the angle between these two vectors must be zero.
Why does the internal voltage of the stator lie along the q axis?
It lies on the q-axis because it is entirely due to the field flux (see pp. 6-7 of “Simplified Models”). It is also equivalent to EFD (see Ex 5.1, p. 175, eqts.
What is the power angle in synchronous generator?
Power angle can also be defined in terms of armature or stator mmf and resultant air gap mmf. In a synchronous generator, the stator mmf lags behind the resultant air gap mmf. This angle of lag is called load or power angle.
What is power angle of synchronous machines?
Power Angle Curve of Synchronous Machine is the graphical representation of electrical output with respect to the power angle. As we know, power angle is also known as load angle, therefore it can be said that this curve is graphical representation of electrical output of generator with respect to load angle.
What is the relation between the EMF phasor and flux phasor in a synchronous machine?
Whenever the magnetic structure of a cylindrical rotor synchronous machine is subjected to rotating mmf vector, it is seen as an mmf phasor from the stator with its flux phasor in phase with it, while the phasor representing the phase emf induced lags behind both these phasors by 90° (see Fig. 8.3).
Why load angle is positive for generator and negative for motor?
Detailed Solution. The load angle is the angle between the no-load excitation voltage Ef and terminal voltage Vt. Load angle (δ) or torque angle is negative when rotor fields leads the resultant field and it is positive when the rotor field lags the resultant field.
What is power angle in power?
Power angle is the angle between a generator’s internal voltage and its terminal voltage, or between the voltages at the source and load points of an electrical transmission line.
What is the power factor angle?
The power factor of an AC circuit is defined as the ratio of the real power (W) consumed by a circuit to the apparent power (VA) consumed by the same circuit. When the power factor equals zero (0), the phase angle between the current and the voltage will be 90o as: cos-1(0) = 90o.
What is the analysis of the salient pole synchronous motor?
The analysis of salient pole synchronous motor is based on the Blondel’s two reaction. The direct and quadrature axis components of current and reactance are same as defined earlier for the synchronous generators. Thus,
Is the phasor always behind the synchronous motor?
(1) We know that if a machine is made to work as a asynchronous motor then direction of armature current will in phase opposition to that of the excitation emf. (2) Phasor excitation emf is always behind the phasor terminal voltage. Above two points are sufficient for drawing the phasor diagram for synchronous motor.
How are voltages and currents related in a phasor diagram?
A phasor diagram shows the relationship between voltages and currents. One such diagram is shown in Fig. 8.10 for a non-salient pole synchronous generator. The terminal voltage, Vt, is taken as the reference phasor. The equation for the phasor diagram is,
What is the δ of a phasor rotor?
Physically, as we have seen, δ is the angle between the resultant rotating field and the direct axis of the rotor, i.e. the ‘lag’ of the rotor with respect to the resultant field, and it therefore bears some similarity with the load angle of motors that have rotor excitation.