What is the basic principle of Generator excitation?
The basic principle of generator excitation is that once the gasket of tie generator is being checked, the generator excits as if the block is not inserted. By egbebu emmanuel
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What is the basic principle of the steam turbine that can be used to drive generator to produce electricity?
A gas turbine extracts energy from a flow of hot gas produced by combustion of gas or fuel oil in a stream of compressed air. It has an upstream air compressor (radial or … axial flow ) mechanically coupled to a downstream turbine and a combustion chamber in between. "Gas turbine" may also refer to just the turbine element.. Energy is released when compressed air is mixed with fuel and ignited in the combustor . The resulting gases are directed over the turbine's blades, spinning the turbine, and mechanically powering the compressor. Finally, the gases are passed through a nozzle , generating additional thrust by accelerating the hot exhaust gases by expansion back to atmospheric pressure.. Energy is extracted in the form of shaft power, compressed air and thrust, in any combination, and used to power aircraft , trains , ships , electrical generators , and even tanks .. A gas turbine extracts energy from a flow of hot gas produced by combustion of gas or fuel oil in a stream of compressed air. It has an upstream air compressor (radial or axial flow ) mechanically coupled to a downstream turbine and a combustion chamber in between. "Gas turbine" may also refer to just the turbine element.. Energy is released when compressed air is mixed with fuel and ignited in the combustor . The resulting gases are directed over the turbine's blades, spinning the turbine, and mechanically powering the compressor. Finally, the gases are passed through a nozzle , generating additional thrust by accelerating the hot exhaust gases by expansion back to atmospheric pressure.. Energy is extracted in the form of shaft power, compressed air and thrust, in any combination, and used to power aircraft , trains , ships , electrical generators , and even tanks .
A loss of excitation will cause the generator to start drawing more and more reactive power over time. Over the first few seconds, and until about thirty seconds after the LOE… (depending on the load on the generator before the loss of excitation occurred), active power will stay relatively constant, but reactive power will continue to be absorbed from the rest of the system, and voltage levels will drop. Eventually, the magnetic field between the stator and rotor degrades too much, pole slipping and loss of synchronism will occur. At this point, catastrophic damage will likely have been done to the generator.
Electromagnetic induction is the principle of generator. This mechanical energy is converted into electrical energy.
the voltage which is given for creating magnetic field in a generator is known as excitation voltage.
Basic principles are ideologies that guide a school of thought or for that matter an entire institution.These are laid down by thinkers or the heads of an institution.It can b…e called a charter that helps anything to work with the help of the bylaws that are set.
The basic principle of ac generator is electromagnetic induction when a coil of a conductor moves in a magnetic field the electrons in it starts moving because of attraction a…nd repulsion of magnetic field. Thus, an emf is induced in it.
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The scientific principle on which generators operate was discovered almost simultaneously in about 1831 by the English chemist and physicist, Michael Faraday , and the Amer…ican physicist, Joseph Henry. Imagine that a coil of wire is placed within a magnetic field, with the ends of the coil attached to some electrical device, such as a galvanometer. If the coil is rotated within the magnetic field, the galvanometer shows that a current has been induced within the coil. The magnitude of the induced current depends on three factors: the strength of the magnetic field, the length of the coil, and the speed with which the coil moves within the field. In fact, it makes no difference as to whether the coil rotates within the magnetic field or the magnetic field is caused to rotate around the coil. The important factor is that the wire and the magnetic field are in motion in relation to each other. In general, most DC generators have a stationary magnetic field and a rotating coil, while most AC generators have a stationary coil and a rotating magnetic field.
how do you excite a generator
It's part of a larger generator that uses field windings (typically on the rotor or spinning part of the generator) instead of permanent magnets to create an electromagnet. Th…e exciter generator provides the power to the field windings. It often is attached to the same shaft as the larger generator.
A separately-excited dc generator is a dc generator whose field magnet winding current is supplied by an external dc voltage source. For comparison, a self-excited dc gener…ator is a dc generator whose field magnet winding is supplied by current from the output of the generator itself.
A Large electrical generator has a field winding which requires power from somewhere, so you often see a second smaller generator mounted on the genreator backshaft. This is t…he field generator, or exciter generator.
In a generator there should be residual magnetism to start the voltage production . However maintaining the voltage level is a little more complicated because of drift when lo…ads are applied to the unit. to overcome some of the problems an exciter coil section produces a voltage at a know level. that level used as a reference to increase or lower the output of the main generator. Onan YD units have an output of approximately 24volts if the voltage lags the current by 10% it raises the exciter voltage to offset the lagging voltage. Most generators has an AVR (automatic voltage regulator) that will more closely hold frequency (a function of rpm) voltage and current at an even load. without some excitation the generation process would wonder up and down seeking a midpoint but fluctuating wildly with every output request.
In Electronics Engineering
many digital electronics require some notion of time passing to operate. For example a time of day clock requires a signal of one second to update the time signal which is bas…ically just a special counter. An oscilloscope needs some time reference to advance the trace across the X-axis of the screen. A frequency counter literally measures events during a given time interval. In these instruments, there will be a signal called a clock which is basically an oscillator-driven signal which is processed to a digital signal called a "clock" and used to measure or advance events every clock cycle. Usually the time base clock is the major factor determining the overall accuracy of the instrument so better instruments have clocks derived from crystal oscillators and variations of crystal oscillators with even better characteristics.
In Electrical Engineering
A large alternator needs a DC supply to feed to the rotor windingsthrough slip-rings. If the supply comes from a DC generator on thesame shaft, that is the exciter.
The rotor must have a magnetic field in order to generator voltagein stator winding. The exciter circuit generates this DC filed inthe rotor.
Generator has a rotor and stator. To produce voltage on statorterminals, the rotor must have a magnetic field, while it rotates.This magnetic field is given by the excitation …system mounted onthe rotor shaft itself.