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The controller and mechanical brakes.
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What are the types of bearings used in a steam turbine?
main two type of bearing used in steam turbine:(1)thrust bearing (2)general bearing
What is the differeance between upwind and downwind turbines?
An Upwind turbine faces into the wind with the turbine blades in front of the Nacelle* while a Downwind turbine has blades to the rear of the Nacelle and faces away from the wind. Up-wind turbines are by far and away the most common, but down-wind turbines (usually two-bladed) are also used in certain situations.In very strong winds the turbine blades of a wind turbine generator flex under enormous forces. With a down-wind turbine the blades flex AWAY from the mast which prevents them from crashing into it. Up-wind turbines need to be designed so that the blades are positioned at a good distance from the mast, and they must also be engineered to be inflexible (which costs more money). In addition, when the blades of a down-wind turbine bend it reduces the stresses on the mast as wind energy is lost in bending the blades. Finally, down-wind turbines do not need a tail (or motorised yaw mechanism) to align them with wind as the turbine blades perform this task (although this can also be a serious disadvantage in large down-wind turbines if wires carrying huge currents are getting twisted).Down-wind turbines on the other hand are generally noisier (additional aerodynamic noise), and the blades are subject to more forces than those of up-wind turbines. Another serious disadvantage of a down-wind turbine is wind shadow behind the mast causing a drop in power each time a blade passed behind the mast.*Nacelle = is located at the top of the mast and contains the rotor and generator, and sometimes a gearbox. Basically it is everything except the turbine blades, tail, and mast.
What is turbine overspeed trip?
Typically two balls with springs holding them down, When the turbine spins too fast, the centrifugal force pushes the balls past the resistance of the springs at which point they hit a lever that stops steam/compressed gas flow to the turbine and the turbine shuts down. They are designed to keep the turbine from going so fast that it damages itself or the piece of equipment it is driving.
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.
What is Turbine cold start up?
cold start up of a steam turbine has to be done after a rather long period of shut down - when turbine case and chest temperature are fallen down dramatically. turbine constructor heating ramps mast be followed in order to avoid thermal stresses on the metal of turbine case , valve case and rotor to avoid also height differential expansion between rotor and case that could lead to contact between case and rotor because of the different thermal inertia of the two parts.when the heating is complited the turbine can be started checking closely the differntial expansion recorders.when at speed the unit can be sincronyzed (usually at 3000 rpm) and then loaded according to the related load ramp.(megawatts\ minute)
What are two types of brakes of the wind turbine?
The controller and mechanical brakes.
What are two types of brakes on a wind turbine?
The controller and mechanical brakes.
What two energy transfers take place when a wind turbine is working?
the wind moves the wind turbine so that kinetic then it is turned into electricity.
What are the two basic types of steam turbines?
impulsive turbine reaction turbine
How many feet wide is a wind turbine?
Wind turbine vary enormously in size from a small turbine on a boat with blades about two feet in diameter to large industrial 'wind farms' the blades of which are individually dozens of feet long
What exactly does a rooftop wind turbine do?
A rooftop wind turbine produces wind power, and can reach speeds between two and 45 miles per hour. It is a better alternative to air conditioning, and saves lots of energy.
What are the two main methods controlling the power output from the rotors on a wind turbine?
nithing
What are two types of service brakes used on vehicle?
drum brake and disc brakes
How much CO2 does a wind turbine save?
A typical modern wind turbine has a capacity of two megawatts (MW) and is expected to save emissions of over 1,880 tonnes of carbon dioxide (CO2) in an average year.
How do you replace rear brakes on a 1999 Mercury Sable?
Brakes come in two types: disc or drum.See "Related Questions" below for coverage of both types...
Are disic brakes the same as hydrolic brakes?
No. Hydraulic brakes can be either drum or disc brakes, and these two brake types are available as air brakes and air-over-hydraulic systems, as well.
What are two main brake types of a bicycle?
Caliper and Disk brakes
