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Applications of synchronous motor?
It is used in variety of applications such as... · Machine Tools such as a ball mill · Motor generator sets · Synchronous clocks · Timing devices · Synchronous condensers to condition electrical power · Record players · Robotics
When the induction motor working as induction generator?
An induction motor connected to an existing ac supply normally runs at less than the synchronous speed by an amount described as the 'slip' which is proportional to the torque demanded at the shaft. If the same motor is instead coupled to an engine and driven at a speed higher than the synchronous speed, with negative slip, power then travels back into the ac supply and the motor has become a generator. The amount of power produced depends on the speed. However a normal induction motor will not behave as a stand-alone ac generator. For ac power generation synchronous generators are invariably used because it is necessary to set and maintain the frequency of the supply accurately.
What is a voltage droop used for?
The purpose of a voltage droop is to intentionally reduce the voltage of a device. Further information about why and when one would do this can be found on Wikipedia.
What is ment by Generator Pole slip protection?
Pole slipping of a synchronous machine occurs during insufficient electromagnetic torque to hold the rotor in synchronism with the stator magnetic flux It is caused by an imbalance between the mechanical power and electrical power of a synchronous machine. Pole slipping either between generators and systems, or between two sections of the systems, results in a flow of synchronizing power, which reverses in direction twice every slip cycle.
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
Which type of generator is used in windmills?
Synchronous generators
What is a potier triangle?
it is used to calculate the voltage regulation of synchronous generator
How are alternators used in conventional power stations?
Alternator is just another name for a synchronous generator. These are the most common type of generator in hydro stations, steam plants, etc. They provide enormous amounts of power and can come iv a wide variety of sizes.
Applications of synchronous motor?
It is used in variety of applications such as... · Machine Tools such as a ball mill · Motor generator sets · Synchronous clocks · Timing devices · Synchronous condensers to condition electrical power · Record players · Robotics
Why is speed not normally used to control the armature voltage of a synchronous alternator?
Because if speed was used, the power system frequency would be changed. A synchronous generator spins at synchronous speeds. Synchronous generators 101: A typical synchronous generator will have a field winding (typically on the rotor, or rotating part) and a stator winding (the stationary part where power is supplied to the power grid). Current is injected into the field winding, turning it into an electromagnet. This field current is controlled by the Automatic Voltage Regulator (AVR). The more current supplied to the field winding, the stronger the electromagnet becomes, and the more power is required from the prime mover (whatever is supplying the power - steam turbine, for example) to keep the generator spinning at synchronous speeds.
What is a synchronous generator?
Synchronous generators are the majority source of commercial electrical energy. They are commonly used to convert the mechanical power output of steam turbines, gas turbines, reciprocating engines and hydro turbines into electrical power for the grid. (OR) A "synchronous" generator runs at a constant speed and draws its excitation from a power source external or independent of the load or transmission network it is supplying. A synchronous generator has an exciter that enables the synchronous generator to produce its own " reactive" power and to also regulate its voltage. Synchronous generators can operate in parallel with the utility or in "stand-alone" or "island" mode. Synchronous generators require a speed reduction gear
When the induction motor working as induction generator?
An induction motor connected to an existing ac supply normally runs at less than the synchronous speed by an amount described as the 'slip' which is proportional to the torque demanded at the shaft. If the same motor is instead coupled to an engine and driven at a speed higher than the synchronous speed, with negative slip, power then travels back into the ac supply and the motor has become a generator. The amount of power produced depends on the speed. However a normal induction motor will not behave as a stand-alone ac generator. For ac power generation synchronous generators are invariably used because it is necessary to set and maintain the frequency of the supply accurately.
What is the effect of increasing speed droop on governor of hydro electric generator?
I would suggest what you mean is to increase speed droop sensitivity. That mean you reduce speed droop percentage set point. I will answer primary impact only assuming your plant is grid connected. Assuming your current speed droop percentage set point is 10% and you have a 100MW hydro turbine generator serving a 50-Hz grid system. Therefore your droop response due to system frequency deviation is 100MW for every 5Hz (10% of your system nominal frequency of 50 Hz), or +/- 20MW/Hz or 2MW/0.1Hz. What this number does? It will be used by your governor to compensate the load of your hydro turbine as system frequency deviates from the reference frequency. As system frequency increases by 0.1Hz, the governor will subtract generator output by 2MW from the current load set point. If system frequency decreases by 0.1Hz then the governor will add 2MW to the current load set point. This is done automatically. Now you want to increase its sensitivity of your governor from this set point to 5%. You are actually doubling the response. That means the new load response will be +4MW/0.1Hz if unit system frequency reduces from the reference frequency and -4MW/0.1Hz if system frequency increases above the reference frequency. If you increase the sensitivity further to 2.5, then the new response will be +/-8MW/0.1Hz.
3 prime energy sources that are generally used that drive an electromagnetic generator?
Wind, Hydro, Gas/Coal powered power station
Why droop ct used in generators?
Droop CT is used to control load sharing of the reactive power b/w paralleled generators.
Why synchronous motor is used in ac and dc?
A synchronous motor is used only with a.c. Its speed is dependent on the frequency of the a.c.
What is a voltage droop used for?
The purpose of a voltage droop is to intentionally reduce the voltage of a device. Further information about why and when one would do this can be found on Wikipedia.
