关键词: 水轮发电机组; 超期服役; 安全评估; 寿命预测; 葛洲坝水电站;

Abstract: It is necessary to carry out safety evaluation on hydraulic turbine-generator units in extended service.In this paper, taking the Gezhouba Hydropower Station as an example, we carry out a safety evaluation for the hydraulic turbine-generator units in extended service.The working scope, methods and criteria of safety evaluation are put forward by analyzing the basic operation conditions of the existing hydraulic turbine-generator units in extended service.Through on-site appearance inspection and evaluation, test detection and numerical calculation(stiffness and strength analysis of key components and fatigue strength calculation) and the comprehensive evaluation method, we detect and analyze the current situation and performance of the hydraulic turbine-generator unit.According to the analysis results, we can evaluate the residual life of extended service hydraulic turbine-generator units, and give the relevant reformation suggestion and plan.The research results can provide reference for the safety evaluation of similar hydraulic turbine-generator units in extended service.

Key words: hydraulic turbine-generator unit; extended service; safety evaluation; prediction of residual life; Gezhouba Hydropower Station;