As an important parameter of steam turbine governing system

the dead band property was generally taken from the static characteristic curve. The infection of all factors in governing system upon the said property has been analyzed

it has pointed out that the infection of slide-valve overclosing

friction and mechanical clearance upon the static characteristic is probabilistic

whereas the infection of oil hydraulic force is definite. The deference between static characteristic curve and static procedure curve has clearly been defined. It has pointed out that measuring up the dead band property by using maximum deference values from the up-and-down test static characteristic curve is not in perfection

and the crossing phenomenon at some points on the two curves being discussed as well