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Experiencing problems with a GE MK_V turbine control system used to control a 68.5 MW GE steam turbine. Recently whenever the load command reaches 63% while in governor control mode, the load will not respond either up or down at this point. The only action that can be taken at this point is to switch to load limit controls after which load can be adjusted again.
In the past heavy fluctuations or non-response of control valves were corrected by servicing or replacement of the woodward EG3P servo due to water or contaminated hydraulic oil. However, what is strange about the current behavior is that the load can be adjusted once on load limit but not on governor once a certain load command is reached. Not sure if a dirty oil circuit would affect the controls in governor control but not on load limit.
Would appreciate any feedback thoughts on this.
In the past heavy fluctuations or non-response of control valves were corrected by servicing or replacement of the woodward EG3P servo due to water or contaminated hydraulic oil. However, what is strange about the current behavior is that the load can be adjusted once on load limit but not on governor once a certain load command is reached. Not sure if a dirty oil circuit would affect the controls in governor control but not on load limit.
Would appreciate any feedback thoughts on this.