Table of Contents
- 1 What is the purpose of PMG?
- 2 What is PMG exciter?
- 3 What is the difference between PMA and PMG?
- 4 What is exciter stator?
- 5 What are the methods for improvement of thermal efficiency of open cycle gas turbine?
- 6 Why is PMG frequency high?
- 7 What is the difference between primary energy source and prime mover?
- 8 Why is it important to control the excitation current in generators?
What is the purpose of PMG?
The PMG (Permanent Magnet Generator) is a system which is used for secondary exciting. The PMG provides stable and reliable electric energy for AVR regardless the generator’s terminal voltage. The generator with PMG excitation system can provide 300 \% rated current during short-circuit, which occurs for 5-10 seconds.
What is PMG exciter?
Our PMGs are typically used as the primary excitation source (field supply) for large turbo alternators. The geometry of the generators is designed to fit on large shafts and supply a low output.
How does a PMG generator work?
A permanent magnet alternator (also called PMA, permanent magnet generator, PMG or magneto) relies on the magnetic field generated by a permanent magnet to convert mechanical energy into electrical power. It can generate AC current, with which it can power the whole engine and charge the battery.
Which of the following is the used as starter for a gas turbine I?
Which of the following is (are) used as starter for a gas turbine? Explanation: There are various methods by which a Gas Turbine can be started, they are by the use of an Internal Combustion engine, a steam turbine, an auxiliary electric motor, etc.
What is the difference between PMA and PMG?
PMAs use a thin aluminum housing and the stator is not pressed in. The Legacy PMG. features a very thick aluminum housing with additional cooling fins and a pressed in stator that helps with proper alignment and durability. PMAs have only two mounting holes.
What is exciter stator?
The exciter stator is a component part an AC generator (or alternator) and forms part of the alternators excitation system. It is manufactured primarily from wound copper and electrical steel.
What is the full form of PMG?
PMG
| Acronym | Definition |
|---|---|
| PMG | Postmaster General |
| PMG | Permanent Magnet Generator |
| PMG | Providence Medical Group (Oregon) |
| PMG | Page Map Group |
Which fuel type can be used in a gas turbine?
Explanation: Natural gases,petrol,diesel etc can be used as fuels in gas turbines. Gas turbines requires liquids with high specific heat as fuels.
What are the methods for improvement of thermal efficiency of open cycle gas turbine?
1) Regeneration – This is done by preheating the compressed air before entering to the combustion chamber with the turbine exhaust in a heat exchanger, thus saving fuel consumption. 2) Reheating : The whole expansion in the turbine is achieved in two or more stages & reheating is done after each stage.
Why is PMG frequency high?
The frequency output of the Permanent Magnet Generator is related to the pole count of the exciter – compared to the motor it is feeding. Second, the higher frequency delivers a “smoother” waveform and thus reduces DC ripple – translating in turn to a reduced torque pulsation effect in the motor operation.
What is the purpose of exciter?
The main purpose of exciter in a generator(alternator) is to provide stationary rotating magnetic field. Which is used to induce the e.m.f in the armature coil. So, DC power is given to exciter and the exciter is nothing but a coil, and the exciter creates a magnetic field.
What is the prime mover of an electric generator?
The prime mover can be a steam turbine, a gas turbine, a wind turbine, or a hydro turbine. One very important factor about electric generators is their synchronised operation.
What is the difference between primary energy source and prime mover?
Only the primary energy source and prime mover is different. The prime mover can be a steam turbine, a gas turbine, a wind turbine, or a hydro turbine. One very important factor about electric generators is their synchronised operation. All the power plant generators connect to the national or the regional transmission grid.
Why is it important to control the excitation current in generators?
In any case, it is important to be able to control the field since this will maintain the system voltage. Except for permanent magnet generators, a generator produces output voltage proportional to the magnetic field, which is proportional to the excitation current; if there is no excitation current there is no voltage.
What is the difference between magnetic flux regulation and excitation?
The process of generating a magnetic field by means of an electric current is called excitation. Field coils yield the most flexible form of magnetic flux regulation and de-regulation, but at the expense of a flow of electric current. Hybrid topologies exist, which incorporate both permanent magnets and field coils in the same configuration.