Rotor of turbo generator is rotated by the turbine. In main exciter controlled AC voltage will be generated in armature winding mounted on rotor. The advantage. Reduced costs for spare parts. This self-excitation process continues until the flux reaches a point at which the. Increase in excitation voltage increases reactive volt-ampere (KVAR) which decreases power factor (cos (φ)). Because in Static Excitation System the power for filed excitation is taken from the output of the Generator terminal through CT and PT. This controlled DC voltage is applied to stationary field winding of Main exciter. With its stationary field and rotating armature, the exciter generates three phase high frequency AC output. WEG Electric Machinery’s, WEM’s, brushless excitation system provides high reliability through elimination of brushes, collector rings and carbon dust, which in turn greatly reduces inspection and maintenance costs. This can be overcome by using a slipring-fed wound rotor combined with a power electronic converter connected between the stator and rotor windings. This travelling wave induces currents in the rotor cage which in turn produces the travelling flux wave necessary to induce the stator voltage. I always order there. The primary of the transformer is connected to the alternator bus and their secondary supplies power to the rectifier and also feed power to the grid control circuit and other electrical equipment. We provide you with a list of stored cookies on your computer in our domain so you can check what we stored. The alternator field winding is also supplied through another rectifier circuit. 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Moving a bit left from PMG, you can see a Fan and this is provided for cooling purpose. Kindly share if you get to know any method for the same. Two poles, North and South pole is created on the PMG filed by field flashing. Normally there are six poles on the field, so it will produce AC power at a frequency of 150 Hz. Just i have a doubt with out loss of generation, is there any possibility. I don’t understand what you want to clear. Conducting Materials and Their Applications: Electrical Short Circuit Preventive Measures: PSM and TMS Settings Calculation of a Relay: The excitation is being given through the output of the generator itself. If you wish to opt out, please close your SlideShare account. EME Department, pl reply same board or by mail [email protected], dear sir, Email: info@birr-machines.com. The main and the pilot exciters can be driven either by the main shaft or separately driven by the motor. The poles produce a stationary field which induces a voltage in the exciter rotor winding as it turns. Armature winding of PMG is a stationary part which is mounted on Stator. This system has fast response which is essential requirement now. Series Diode Redundancy for 2-pole Generators 265 - 700 kW at 3,000 - 3,600 RPM. Save my name, email, and website in this browser for the next time I comment. The rotor contains no windings and has double the tooth-pitch of the stator. I like this service ⇒ www.HelpWriting.net ⇐ from Academic Writers. The exciter output is adjusted by an automatic voltage regulator (AVR) for controlling the output terminal voltage of the alternator. Sir, how can we determine thepower rating of pre-exciter require for main exciter and for main generator and their electrical parameters if they are not provided by manufacturer, Alternator running with some load, pmg got fault. The exciter voltage can be built up by using it residual flux. This system consists an AC exciter, stationary field and a rotating armature. In this system, the supply is taken from the alternator itself through a 3-phase star/delta connected step-down transformer. This Armature thus produces three phase AC power by using the mechanical energy of Rotor. The Permanent Magnet Generator (PMG) with its rotating field and stationary armature supplies high frequency AC power to the voltage regulator. by Note that Permanent Magnet of Pilot Exciter is mounted on Rotor, Armature of PMG is stationary as it is wounded on Stator and Field winding of Main Exciter is stationary as it is also wounded to Stator of Main Exciter. Click on the different category headings to find out more. GTC & Code of Conduct; Imprint; Data Protection; Follow us. I and Cos (φ) have to vary according to the load. Armature winding of PMG is a stationary part which is mounted on Stator. Now customize the name of a clipboard to store your clips. The induced voltage in stator winding is nothing but the output voltage of generator. Note that Brushless Exciter is manufactured and supplied separately. By substitution from eqn 5.8: With a simple squirrel cage rotor therefore the slip must be low to avoid high rotor loss with a resultant low efficiency. The more excitation is needed in the system when the load current is large, the speed is less, and the power factor of the system becomes lagging.

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