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How does a generator exciter work?
Exciter controls the magnetic field in the generator system and controls the output voltage and/or current.
What is the excitation system in a generator used for?
The excitation system is used to control the excitation of the rotating field in the armature. By increasing the armature current, it in turn increases the magnetic flux in the armature coil. This has the effect of increasing the voltage output of the generator. By lowering the armature current this in turn lowers the generator output voltage. The generator's voltage regulator automatically adjusts the output voltage continuously as the applied load on the generator changes.
How do you calculate short circuit capacity of generator by using reactance of the winding?
The short circuit capacity of a generator can be calculated by dividing the generator's reactance by the sum of the generator's reactance and the total reactance of the system. This ratio will give you the short circuit capacity of the generator in relation to the total system capacity.
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
What is the governor of a synchronous generator?
The governor of the synchronous generator is the device that controls the torque of the rotor, and thus the frequency of the generated alternating current. This is important if the power plant is directly coupled to a transmission system.
HOW synchronized generator?
A synchronized generator, often referred to as a synchronous generator, operates by maintaining a constant speed that matches the frequency of the electrical grid it supplies. It uses a rotating magnetic field produced by direct current in the rotor, which interacts with the stator windings to generate alternating current (AC). The generator's synchronous speed is determined by the frequency of the AC system and the number of poles in the generator. This synchronization ensures that the generator can efficiently produce power and maintain stability within the electrical grid.
What happens to the generator if you run out of diesel?
If you run out of diesel while operating a generator, the engine will stop running since it no longer has fuel to operate. This can lead to potential issues such as fuel system contamination or air entering the fuel lines, which may require bleeding the system to restart. It’s advisable to refill the tank promptly and follow the manufacturer's guidelines for restarting the generator to avoid damage.
Why must the oncoming generator on a power system be parralleled at a higher frequency than that of the running system?
If the frequency of the oncoming generator is slightly higher than the system frequency, the phase angle between the system and generator voltages will slowly change at a frequency equal to the difference between system and generator frequencies.
How do you increase amps using a 12v system to a hyd gen?
To increase amps in a 12V system powering a hydrogen generator, you would need to increase the current flow. This can be done by using a power source that can deliver more current or by adding a step-up converter to increase the voltage and, subsequently, the current. It is important to ensure that the components can handle the increased current to avoid damaging the system.
How do you define the synchronous generator capability limiters?
SYNCHRONOUS GENERATOR CAPABILITY LIMITTsynchronous generator capability limiters are as follows 1.MVA or armature current limit of generator: this depends on the cooling system of generator so that temperature rise in generator is limited to safe value.depending on cooling system effectiveness and temperature limit for the insulation used in generator, MVA limit is decided.2.MW limit: this is determined by the power output capacity of prime mover to which generator is connected.3.rotor angle limit: this is related to stability of generator which is synchronised to the grid.ideally this could be 90 degree, but in practice this is limited to70 degree so as to have better stability margin in transient and dynamic condition.the generator falls out of synchronism in trasient condition if rotor angle is close to 90 degree.4. rotor current limit: the field winding placed on rotor has got limited current carrying capacity, beyond which it may burn .so this limit is used.all these limitters make capability curve of g generator within which the generators operates safelyr. k.niranjanemail id: rkniranjan@yahoo.com
What is the function of the XP commutator in an electrical system?
The XP commutator in an electrical system is responsible for reversing the direction of current flow in the circuit, which helps to ensure that the motor or generator operates smoothly and efficiently.
Why electric generator drop the load?
Too much load for the generator, the generator began to under speed / overspeed, the governor / part of the generator went into failure, the generator capability was not up to the requirements placed by the system (needing to push out/pull in too many VARs), etc. there are many reasons for a generator to drop a load. Because a load dropped, this does not infer that the generator was the cause either (fault on the system, system instability limits reached, system protection tripped - non-generator related protection).
