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Automatic Voltage Regulators for Self Excited
AC Generators
AVR's A key feature of all STAMFORD AVR’s is the engine relief load acceptance feature. This is called the Under Frequency Roll Off (UFRO) circuit. It reduces the output voltage when the engine fails to maintain frequency during motor starting. This reduction in power requirement with engine speed assists the Prime Mover to recover speed after application of a heavy load and protects the rotor against over-excitation. Automatic Voltage Regulators for AC Generators with a ‘Permanent Magnet Generator’ (PMG). This is a separately excited generator powered by a shaft mounted pilot
exciter, a PMG. For more This arrangement of voltage control is often specified, in conjunction with breaker discrimination, for the maintenance of essential power supplies under fault conditions. The PMG provides a constant supply of excitation power which is not contaminated by the load or influenced by the magnetic field of the generator, ideal for use on systems with a high proportion of non linear load. As with the ‘S’ prefixed AVR’s a key feature is the engine relief load acceptance feature. This is called the Under Frequency Roll Off (UFRO) circuit. It reduces the output voltage when the engine fails to maintain frequency during motor starting. This reduction in power with engine speed will permit load acceptance, of up to full load, in a single step.
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If in doubt or you need more information consult our website, www.newage-avkseg.com - alternatively contact the UK factory direct. Barnack Road, Stamford, Lincoinshire, PE9 2NB, England, UK. Tel 44 (0) 1780 484000 . Fax 44 (0) 01780 484100. info@newage-avkseg.com © 2002 Newage International Ltd. 'STAMFORD' is a registered trademark of Newage International Ltd. Note that the pictures used on this CD are only representative of the generator range.
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