Investigation of unexpected Trips in Steam Turbine
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A 56 MW steam turbine tripped several times over a short period of time although the trip signal was not sent. A thorough examination of the turbine at site ruled out any problems with the trip system. The pressure data for control oil line indicated a sudden drop in oil pressure forcing the trip button in trip relay system to move to the trip position. Dynamic simulation of the trip system was carried out to find the effect of various factors including the abnormal behavior of different components. This presentation shows the detailed analysis results, possible causes of failure of the trip system and solution employed to solve these problems.
Nishiyama, Kenichi; Jain, Mayank; Fuchiwaki, Shunsuke; Woon Lip, Teo (2018). Investigation of unexpected Trips in Steam Turbine. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station. Available electronically from