Abstract. The features of video endoscopy system for monitoring working blades of a steam turbine without opening the cylinder body in the operation mode of the turbine unit on a shaft-turning device are considered. The system concept and structural diagram including a flexible and rigid video endoscope, a synchro-sensor and a personal computer, are described. A digital image processing algorithm for calculating blade chords and evaluating the working blades wear dynamics is proposed. The static characteristics of the synchro-sensor are studied using the developed experimental bench simulating the turbine rotor, and the blade chord value is estimated. According to presented experimental data, the error in calculating the blade chord does not exceed 0,2 mm.

Keywords: video endoscopy system, turbine blades, low-pressure cylinder, erosion wear, technical vision

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