September 2013

In a thermal power station coal is burnt to produce steam which in turn, drives the steam turbine hence the generator (turbo set). In figure the elementary features of a thermal power plant is shown. In a thermal power plant coil is burnt to produce high temperature and high pressure steam in a boiler. The […]

A.C power can be generated as a single phase or as a balanced poly-phase system. However, it was found that 3-phase power generation at 50 Hz will be economical and most suitable. Present day three phase generators, used to generate 3-phase power are called alternators (synchronous generators). An alternator has a balanced three phase winding

For switchboards other than those for the generator or intake feeders it is established practice toadd some margin in power capacity of their feeders so that some future growth can be accommodated.The margin is often chosen to be 25% above the TPPL. If the feeders are plain cables or overhead lines then it is a

Heavy industrial gas turbines are usually to be found in refineries, chemical plants and power utilities. They are chosen mainly because of their long and reliable running times between major maintenance overhauls. They are also capable of burning most types of liquid and gaseous fuel, even the heavier crude oils. They also tend to tolerate

Some manufacturers utilize certain of the advantages of the aero-derivative machines, i.e. high powerto- weight ratio and easy maintenance. The high power-to-weight ratios are achieved by running the machines with high combustion and exhaust temperatures and by operating the primary air compressors at reasonably high compression ratios i.e. above 7. A minimum of metal is

Aircraft engines are used as ‘gas generators’, i.e. as a source of hot, high velocity gas. This gas is then directed into a power turbine, which is placed close up to the exhaust of the gas generator. The power turbine drives the generator. The main advantages of Aero-derivative Gas Turbines are:- • Easy maintenance since the gas

For an individual generator that is rated above 1000 kW, and is to be used in the oil industry, it is usual practice to use a gas turbine as the driving machine (also called the prime mover). Below 1000 kW a diesel engine is normally preferred, usually because it is an emergency generator running on

In the first few weeks of a new project the engineer will need to roughly draft a key single-line diagram and a set of subsidiary single-line diagrams. The key single-line diagram should show the sources of power e.g. generators, utility intakes, the main switchboard and the interconnections to the subsidiary or secondary switchboards. It should

The capacity of the battery is determined by the capacity of the individual series connected cells. Parallel connection of cells can be made to increase capacity. In the past this practice was discouraged because a weak or defective cell in one of the batteries means that this battery on discharge does not carry its share