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Manish Kumar Saini has Published 1379 Articles
Manish Kumar Saini
830 Views
The circuit model of a cylindrical rotor synchronous generator or alternator is shown in Figure-1.Let, π = Terminal voltage per phase$πΈ_{π}$ = Excitation voltage per phase$πΌ_{π}$ = Armature current$\delta$ = Load angle (between π and $πΈ_{π}$ )By applying KVL in the circuit, we get, $$\mathrm{π¬_{π} = π½ + π°_{π}π_{π} β¦ ... Read More
Manish Kumar Saini
2K+ Views
The circuit model of a cylindrical rotor synchronous generator is shown in Figure-1.Let, π = Terminal voltage per phase$πΈ_{π}$ = Excitation voltage per phase$πΌ_{π}$ = Armature current$\delta$ = Load angle or angle between π and $πΈ_{π}$Also, the phasor diagram of the alternator at lagging power factor is shown in Figure-2.For ... Read More
Manish Kumar Saini
5K+ Views
The Potier Triangle Method is used in determining the voltage regulation of alternators. It is also known as the Zero Power Factor (ZPF) method. The following assumptions are made in the Potier triangle method βThe armature reaction MMF is constant.The open-circuit characteristic (O.C.C.) taken on no-load accurately represents the relation ... Read More
Manish Kumar Saini
14K+ Views
In practice, a very large number of 3-phase alternators operate in parallel because the various power stations are interconnected through the national grid. The electric power systems are interconnected for economy and reliable operation. This interconnection of power systems requires alternators to operate in parallel with each other.In a generating ... Read More
Manish Kumar Saini
4K+ Views
Consider two synchronous generators or alternators are operating in parallel and their load-frequency characteristics are shown in the figure.Let$π_{1(ππ)}$ = No load frequency of alternator 1$π_{2(ππ)}$ = No load frequency of alternator 2$π_{1(ππ)}$ = Full load frequency of alternator 1$π_{2(ππ)}$ = Full load frequency of alternator 2π = Common operating ... Read More
Manish Kumar Saini
8K+ Views
The slip test is a simple no-load test, which is used to determine the direct-axis and quadrature-axis synchronous reactances of a salient-pole synchronous machine. In this test, a small voltage at rated frequency is applied to the 3-phase stator winding of the synchronous machine. The field winding is unexcited and ... Read More
Manish Kumar Saini
630 Views
A synchronous machine may be subjected to various disturbances. Any cause of disturbance will produce electrical and mechanical transients. These transients may result from switching, from sudden changes of load, from sudden short-circuits between line and ground or between double lines or between all the three lines. These disturbances produce ... Read More
Manish Kumar Saini
5K+ Views
Magnetic Axes of RotorThe figure shows the direct axis and the quadrature axis of a rotor βDirect AxisThe axis of symmetry of the magnetic poles of the rotor is called as direct axis or d-axis. The axis of symmetry of the north magnetic poles of the rotor is known as ... Read More
Manish Kumar Saini
709 Views
A synchronous machine under steady running conditions has a driving torque at every instant balancing its retarding torque. The retarding torque is developed by phase displacement ($\delta$) between the axis of the stator and rotor poles. A mechanical rotary system possesses inertia and restoring torque that tends to restore its ... Read More
Manish Kumar Saini
6K+ Views
In the ampere-turn method (which is also known as the MMF method), the effect of armature leakage reactance is replaced by an equivalent additional armature reaction MMF so that this MMF can be combined with the armature reaction MMF.In order to predict the voltage regulation of the alternator by the ... Read More