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What is turbine rated speed and What is maximum speed rise of steam turbine?
Wiki User
∙ 14y ago
Turbine rated speed varies mainaly on the factors of Generating frequency and means of coupling to generator (viz trough a gear box or directly coupled and no.poles in generator). For exmple a 50hz generting frequency and a bi-pole genarator the turbine speed is 3000RPM. The allowed speed rise also depends on turbine design and generator operational range. Generaly the speed rise is restricted to Maximum of 10% of the rated speed.
Wiki User
∙ 14y ago
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What is the uses of packing steam in turbine?
The main uses for packing steam in a turbine are to produce electricity and power. The steam creates pressure when in turn spins a turbine at very high rates of speed.
What to do about turbine rotor differential expansion?
my LP turbine differential expansion increase ,when rated gland steam temperature maintain.
What is tripping speed?
in a steam turbine, it is the speed at which the turbine should not go above. some time they call it overspeed trip. because the turbine rotor and berings are not design for such high speed and is not capable to handle this huge cenerfugal forces. usually there is two type of trip system: Electronic and Mechanical. some Steam Turbins have both protaction system.
Why extraction taken from steam turbine?
Why extractions are taken out from steam turbine.
What are reasons for over speed tripping of steam turbine genarator in a combined cycle power plant?
wHAT??
What is the uses of packing steam in turbine?
The main uses for packing steam in a turbine are to produce electricity and power. The steam creates pressure when in turn spins a turbine at very high rates of speed.
What is tmcr bmcr conditions of thermal power plant?
BMCR is the boiler maximum continous rating .It is that the maximum temperature , steam flow or the pressure that is used to generate full load or the bolier can withstand.TMCR is the turbine maximum continous rating .It is that the maximum temperature , steam flow or the pressure that the turbine requires for generating full loadNOTE:BMCR WILL BE MORE COMPARED TO TMCR
What is steam velocity in turbine?
That is how fast the steam is actually moving in the turbine. For impulse turbines it is twice as fast as the turbine blades. In reaction turbines it is the same speed as the blades. Because the blades of a turbine cannot move faster than 4500 feet per second without self destructing as it overcomes the centripetal force of the turbine wheels, the steam turbine is designed such that no turbine will exceed more than ~1150 feet per second on its tip speed. Thus the steam velocity through the turbine will be less than ~1150 fps for a reaction turbine and less than ~2300 fps for an impulse turbine, or about ~1570 mph, more than twice the speed of sound.
What is hunting in steam turbines?
When the steam turbine can not maintain its selected or designed speed.Type your answer here... Speed fluctuating from low to high speed continously.
What to do about turbine rotor differential expansion?
my LP turbine differential expansion increase ,when rated gland steam temperature maintain.
What material is used in steam turbine blades?
Hhs, hige speed stele
How do you overspeed steam turbine?
Run the turbine up to about 75% speed and trip it manually. Reset the trip linkage. Restart the turbine. Adjust the governor up until the overspeed trip mechanism trips the stop valve. Watch the tachometer, the overspeed trip should activate within 10% over the maximum allowable speed of the turbine, if it doesn't trip it manually and repair the trip.
What are the basic fundamentals of steam powered electrical generators?
It is the steam turbine that is powered by steam of course, the generator is mechanically coupled and driven by it. Steam at the maximum pressure and temperature produced by the steam raising plant is admitted at the HP end of the turbine, and it travels through the turbine to the LP end. The turbine has blades arranged radially on its shaft and the steam impinges on these and turns the assembly. As the steam progresses down the length of the turbine it loses energy and its pressure is reduced, so the blades have to be made progressively longer, being the maximum at the LP end. To obtain the maximum energy from the steam the LP end is run under vacuum, with the steam exhausting into a large water cooled condenser under the turbine, from where the condensed water is returned to the steam raising plant. The generator is electrically synchronised to the grid system, which is a large interconnected system of multiple units in different locations, all synchronised to each other and running at a fixed frequency (60 Hz or 50 Hz). Each steam turbine has its own governor controlled steam inlet valves. The principle is that if additional load comes onto the system, or drops off for that matter, the system frequency will drop or rise, and the turbine governors will see this because it is reflected back to the turbine rotational speed, and adjust the steam inlet valves to admit more or less steam.
How is the steam turbine speed controlled?
It is usually controlled thorough a regulator which regulates the steam. a bit like a throttle on a car.
Is high speed balancing required for a steam turbine which has been idle for 15 years?
No.
What is a boiler reheater?
In a reheat turbine the stean first enters high speed turbine so its temp and pressure reduces before entering low speed turbine so a reheater is used to reheat the cooled steam
What is tripping speed?
in a steam turbine, it is the speed at which the turbine should not go above. some time they call it overspeed trip. because the turbine rotor and berings are not design for such high speed and is not capable to handle this huge cenerfugal forces. usually there is two type of trip system: Electronic and Mechanical. some Steam Turbins have both protaction system.
