What voltage is generally used for field excitation?

Typical strain gauge circuits use an excitation voltage of 5 – 10 V.

What is excitation current in a generator?

The excitation system monitors the generator output and regulates the magnetic field to maintain the desired voltage. As the load on the generator is increased, an increase in current flow causes the voltage to drop.

How is field excitation achieved in a generator?

The rotor or the field coils in a generator produce the magnetic flux that is essential to the production of the electric power. The rotor is a rotating electromagnet that requires a DC ( Direct Current) electric power source to excite the magnetic field. This power comes from an exciter.

How do I calculate alternator excitation voltage?

Re: Alternator Excitation Voltage KVA at 5 MW = 1.732 * 11* 328 = 6249 KVA. excitation required at 5 MW = 6249*150/9373 = 100 V.

Why DC current is used for excitation?

Originally Answered: Why dc is used as excitation of alternator? Its because you need a constant field. If you give ac it produces a time varying field. In a constant field the armature cuts the flux, hence a time varying emf is induced.

What is field current and armature current?

The field of a synchronous generator is the winding to which the DC excitation current is applied. The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor.

Why AVR is used in generator?

An automatic voltage regulator (AVR) is a device used in generators with the purpose of automatically regulating voltage, which means that it will turn fluctuating voltage levels into constant voltage levels.

What is current excited component?

Excitation current is the current flowing into the high voltage winding with the low voltage side open. This current should be proportional to the No-load acceptance test but with the difference resultant from the use of test voltages different from nominal values.

What type of current is generated on the exciter armature?

The exciter has its field winding (DC current) in the stator and armature winding in the rotor. In the case of an AC exciter generator, the three-phase AC is induced in the rotor winding, which is rectified using diode, thyristor, or transistor bridge installed in the rotor.

What is excitation voltage in synchronous generator?

A. synchronous generator excitation voltage is the voltage. measured at the generator terminals when the load current is. equal to zero.