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What are reasons for over speed tripping of steam turbine genarator in a combined cycle power plant?
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∙ 16y ago
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∙ 16y ago
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Why tripping value of axial shift of steam turbine is more than turbine rotor float?
axial shift depends upon the gap between rotot blade and fixed blade , not on float
What is turbine rated speed and What is maximum speed rise of steam turbine?
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.
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 is there a little spiral on the front of jet engines?
So that it is easier to tell from afar whether the turbine is rotating or not, for safety reasons
What is HP and LP turbine expansion?
HP Turbine is High Performance Turbine LP Turbine is Low Performance Turbine
An example of an energy input to a genarator is?
Whatever is turning the shaft (turbine, motor, hand crank, etc.).
Why tripping value of axial shift of steam turbine is more than turbine rotor float?
axial shift depends upon the gap between rotot blade and fixed blade , not on float
What is the definition of combined cycle turbine technology?
Using waste energy in a gas fired electricity generation plant to run a steam turbine
What is turbine rated speed and What is maximum speed rise of steam turbine?
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.
What is the efficiency of thermal power plant?
A modern combined cycle gas turbine/ steam turbine power plant can reach almost 60% efficiency.
Why vibration occur in turbine?
2 main reasons: 1. Imbalance of the turbine, 2. Shock waves from the air (if it's spinning fast enough)
Why there is tripping given in vacuum in thermal power station?
Generally the condenser in the power plants are designed to operate under vacuum. The specific volume of the steam is relatively higher than water. The steam coming from the exhaust of the turbine is cooled by the circulating water and the non combustibles are removed by the air removing equipment like ejectors or vacuum pumps. In case these equipment fail condensation of steam fails and it tries to occupy more volume. As the space in the condenser is limited it is pressurized and failure would happen. More over once the condenser is pressurized the flow through the turbine is reduced considerably which leads to churning of steam in the turbine which ultimately heats the turbine blades leading to failure. Hence a tripping of turbine is introduced which cuts of steam flow into the turbine and the condenser.
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 happens if the main steam inlet temperature to turbine reduce beyond tripping limit?
flood the condenser and rip the fix and moving blades though the casing, also causing loss of vacume
Why is the runaway speed of a hydraulic turbine always kept twice its normal speed?
The runaway speed of a hydraulic turbine is the speed at which the turbine coupled to the generator runs at the maximum possible speed due to loss of load and this happens until the shut off valves completely closes the discharge from the penstock. the runaway speed of the turbine is determined by the turbine designer and is influenced by the maximum discharge of water from the penstock, the combined inertia of the turbine runner and the generator and the flywheel. this factor can vary from 1.5 up to 3 times the nominal speed of the turbine and is determined by the turbine designer considering all the load parameters.
What is the difference between combined cycle and cogeneration?
In Cogeneration Plant : The generated steam in boiler is used for both power generation & process heating, thereby reducing the condenstion losses compared to thermal power plant. In combined cycle first is gas turbine , rather than wasting the flue gas from gas turbine, we are sending it into boiler and again generating steam for running steam turbine. Both the ways we are increasing the thermal efficiency of the plant
Why is there a little spiral on the front of jet engines?
So that it is easier to tell from afar whether the turbine is rotating or not, for safety reasons
