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What is the difference between generator over excitation versus under excitation when attached to the grid?
Over Excitation is a condition when the Excitation System is providing too much field current and as a result, the rotor of the generator will over heat. The Excitation System is equipped with an Over Excitation Limiter. This limiter acts to reduce the Excitation Current if this condition exists Underexcitation is a condition when the generator is not getting enough Excitation Current. If the generator does not get enough Excitation Current, it can be un-synchronized with the grid. We call this slipping a pole. If this occurs, the generator can be severely damaged. Kelly Thompson Engineering Lead Siemens Energy Alpharetta GA
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What is the difference between a seperately excited DC generator and DC shunt generator?
The difference between a separately excited DC generator and a Shunt DC generator is that for a separately excited Dc generator , the excitation field winding is supplied by an external source different from that supplying the armature while for shunt generator, the excitation field windind is connected in series with the armature and supplied by a single source.
What is loss of excitation in generators?
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.
What is the difference between external and internal characteristics of dc shunt generator?
everything
What is the major difference between a marine generator and an industrial generator?
An industrial generator has some form of built-in cooling system. A marine generator relies on pumping water from the lake or ocean the vessel is in for cooling.
What are the Difference between dc motor and dc generator?
a motor Will do work by consuming power a generator is just the opposite
What is the difference between a seperately excited DC generator and DC shunt generator?
The difference between a separately excited DC generator and a Shunt DC generator is that for a separately excited Dc generator , the excitation field winding is supplied by an external source different from that supplying the armature while for shunt generator, the excitation field windind is connected in series with the armature and supplied by a single source.
What is the fundamental difference between a battery and a generator?
the fundamental difference between a battery and a generator is that a battery uses chemicals
Difference between truth table and excitation table?
truth table contains inputs and excitation table takes outputs as inputs
Difference between excitation table and truth table?
truth table gives relation between i/p & o/p. excitation table is use for design of ff & counters.
Difference between static excitation system?
It is called static excitation when you make use of solid state components like diode and thyristors to convert to pure dc and to use this dc for field excitation of synchronous generators. The field winding of synchronous generators can be excited by dc source only. It is called brushless excitation because use of carbon brushes are not made here.It is called dynamic excitation is when you make use of rotating brushes. Excitation is necessary to produce reactive power and also to regulate the voltage of synchronous generators.
What is difference between generator potential and receptor potential?
it is
What effects causes the difference in terminal voltage between the increasing and decreasing field excitation current?
sdrg
An atom that undergoes excitation and de-excitation emits?
An atom that undergoes excitation and de-excitation emits photons of light. When an electron in an atom absorbs energy and moves to a higher energy level (excitation), it eventually returns to its original state (de-excitation) and emits a photon of light corresponding to the energy difference between the two levels.
What is the difference between a commercial power generator and a regular power generator?
The difference between a commercial power generator and a regular power generator is that a commercial one is much expensive than the regular one. It's much better to purchase the regular generator if your not planning to use it for business purposes.
What is the difference between a wing and a airfoil?
there is not much difference between them but a wing is usually attached to a bird or a plane and the airfoil is attached in a planes' engine
Difference between magneto and ac generator?
magneto is dc
What is the difference between a wing and an airfoil?
the difference is that the wing is attached to the bussom of a bird and an airfoil is attached to the clock of the plane.
