Answer Posted / sunil kumar kr
Droop is defined as a decrease in speed setting with increase in. Without some form of droop, it would be difficult to control the speed of engine with load changes..
Droop is expressed as a percentage of the original speed setting from no load to full load. It generally varies up to 5%. Generally 3% to 5%. Droop setting below 2.5% should be avoided considering the stability of the system.
Droop is calculated as:
% Droop = (Speed at No Load– Speed at Rated Full Load} x 100/Full Load Rated Sped
If speed setting increases with increase in load, the governor is showing negative droop. It will cause instability of a governor.
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