Some Problems Connected with Steam Turbine Governing

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Abstract
The recent growth in the size of steam turbines has made desirable the use of governing systems using two or more relays working in series to operate the governor valves. The rise in initial steam pressures and the increase in the number of turbine cylinders which has accompanied this growth has increased the relative energy of the steam entrained in the steam chests, cylinders, and interconnecting piping so that this entrained steam has become a most important factor in problems concerned with the stability of governing and with the maximum temporary speed rise when load is suddenly removed. The present investigation has been made to determine the effect of the number of relays and of the entrained steam energy on governing stability and on temporary speed rise. The problems have had, to some extent, to be treated separately as the inclusion of governor inertia, multiple relays, and entrained steam lead to stability criteria of too great complexity to be generally useful.

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