Draft tube surge detection in Francis hydroturbines using bispectrum analysis

被引：5

作者：

Shirazi, Farzad A. ^{[1
]}

Mahjoob, Mohammad J. ^{[1
]}

机构：

[1] Univ Tehran, Sch Mech Engn, NVA Res Ctr, Tehran 14174, Iran

来源：

2007 IEEE INTERNATIONAL CONFERENCE ON MECHATRONICS AND AUTOMATION, VOLS I-V, CONFERENCE PROCEEDINGS | 2007年

关键词：

bispectrum analysis; Francis turbine; draft tube surge detection;

D O I：

10.1109/ICMA.2007.4303871

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The pressure surge in the draft tube is one of the main causes of instability and power losses in hydro power plants. This fault usually happens when the turbine operates in part load. Early detection of draft tube surge helps the operators to prevent potential damages to the turbine. In this study a new method for detection of draft tube surge from vibration signals is presented. The vibration signals of turbine guide bearing, draft tube and spiral case are acquired. These signals are then processed using bispectrum analysis. Bispectrum analysis can detect the nonlinearities present in the signal. When surge in draft tube occurs, changes are observed in signal bispectrum which show the occurrence of the fault in turbine. Therefore, this technique can be used as a powerful tool for fault detection in turbines. The results of different measurement positions are also discussed and the most significant ones are presented. The results demonstrate the efficiency of this method in draft tube surge detection.

引用

页码：2077 / 2081

页数：5