CONTROL METHOD OF VALVE IN CASE OF ABNORMALITY OF VALVE OPENING DETECTOR

摘要

PURPOSE:To stably operate a turbine, by fixing a valve, in which abnormality is generated, to a fully closed or fully opened position in accordacne with an operational condition of the steam turbine when abnormality is detected in a valve opening detector equipped to an electronic hydraulic govenor. CONSTITUTION:In a steam turbine electronic hydrualic governor equipped with an abnormality detector 7 in a valve opening detector 5, a switch 10 is selected by an operation detecting circuit 9 respectively to a bottom side during operation of a turbine and an upper side during stopping of the turbine. If abnormality is generated in a valve detecting part during stopping of the turbine, a selector switch 3 is switched to a bottom side. At this time, because the switch 10 is selected to the upper side, a valve full closing signal is applied to an input of a deviation detector circuit 4. And if abnoramlity is generated in the valve detecting part during operation of the turbine, because the switch 10 is selected to the bottom side, a valve full open signal is applied to the circuit 4. In this way, a valve can be fixed to a ncecessary position in accordance with an operational condition of the turbine.