In a power supply, the automatic holding of of the output voltage to a c value, despite variations in the input voltage or load resistance. resistance. Sign up to vote on this title
2.
Current regulation:
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V.T. FEED BACK
INPUT (power supply) Sign up to vote on this title
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C.T. FOR CURRENT FEED BACK SIGNAL TO AVR
GENERATOR V.T. FOR VOLTAGE FEED BACK SIGNAL TO AVR Sign up to vote on this title
EXCITER
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To test AVR we should provide the three indicated i/p elements : 1. Feed back signal from the generator o/p current.
2. Feed back signal from the generator o/p voltage. voltage. 3. A method to supply AVR AVR itself. Sign up to vote on this title
The test we made ,was on the AVR of the emergency generator & its power su Useful Not useful a permanent magnet type. You're Reading a Preview
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Variable re For tuning
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For simulation testing circuit ,we used: 1. 110v ac power supply that represents the permanent magnet supply.
2. 380v ac (R(R-S-T) that represents the voltage gen. o/p signal to test the ma 3. Lamp at the o/p terminals. Sign up to vote on this title
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We have a reference values which were taken from the actual operation from tuned AVR works in the current time on the machine: 1. Be sure that the two V.T. s which feed by the Gen. o/p voltage to feed back t By the voltage signal have the correct turns ratio ( 380/200v for the new AVR (380/380v for the old AVRs). AVRs). 2. If we applied the 73v ac on the AVR i /p terminals ((points points 11,12&13 in termin We get 97v dc on the AVR o/p terminals (points ( points F1&F2 in terminal strip). strip). Sign up to vote on this title
When making this test we cared about testing the all circuit of AVR so ,we on Useful Not useful Supplied the AVR by 73v ac on its i /p & noted the o/p (lamp position). If the lam We started to make our checks : You're Reading a Preview
