Safety of Hydraulic Structures Against Vibrations Generated Due to Operation of Turbine Unit—A Case Study

会议论文
发表日期：

2024年

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Vijay Ghodake,
Prakash K Palei,
S. Santhosh Kumar,
Rizwan Ali

摘要

Hydraulic structures such as dam, powerhouse, aqueduct, and barrages or any other structures are designed to withstand certain level of vibration. These structures produce particular signature of vibrations. A change in the signature of vibrations in these structures or its parts indicates the presence of abnormality. Powerhouse operation is one of the main reasons of vibrations in the dam structure and powerhouse civil structure; thus, periodical vibration monitoring due to operation of generation unit will enhance the performance of the generation unit by minimizing the chances of sudden failure. The effects of vibration sometimes can be very severe. Excess level of vibration can cause reduction in efficiency of generator machinery and may damage the unit. Vibrating machinery can create noise, cause safety problems, and lead to degradation in plant working conditions. Hence, monitoring of vibration gives important information about the structural safety of these structures which helps to take remedial measures for reducing vibrations. The present paper is based on the details of the vibration measurement studies carried out for safety of dam and powerhouse structure during the operation of Unit No. 3 of Kadana Hydroelectric Project, Gujarat, in generation as well as in pump mode condition. Vibrations measured at preselected locations, viz. dam top, near penstock gate, inspection gallery, penstock gallery, generator floor, turbine floor, and turbine pit and at draft tube gate during the operation of Unit No. 3 both in generation mode as well as in pump mode under different operating conditions. Various available international standards have been reviewed to recommend the safe vibration level for the safety of dam, powerhouse structure, and the generation unit. Based on analysis of the vibration results, it has been found that the observed vibration levels are well below the adopted safe vibration levels of the respective structures.