Analysis and Treatment of Abnormal Vibration of a Gas Turbine Generator Set

Hankun Bing,Le Pang,Zhengfeng Wu,Yuzhu Zhao,C.-H Weng,R Weerasinghe,J Wu

doi:10.1051/e3sconf/201911802038

Abstract

In this paper, The turn-to-turn short-circuit fault is accurately judged by the vibration monitoring of a gas turbine generator set. The abnormal conditions in the post-processing process are analyzed and summarized, and the conclusion is verified by the disintegration.The analysis method of abnormal response in the process of dynamic balance of units is determined, which provides a reference for effect evaluation and scheme determination for the on-site dynamic balance treatment of the same type unit.

Highlights

The gas turbine produced by GE company is the type of PG9171E, which is composed of a starting motor with rated power of 1000KW, a 17-stage axial compressor, a combustion system composed of 14 combustion Chambers and a 3-stage turbine rotor
The axial compressor rotor and turbine rotor are connected by flanges, which have three supporting bearings
The abnormal increase of generator vibration in a gas turbine power plant is tracked and analyzed, and the possibility of misjudgement in judging the short-circuit between rotor turns in the ROS experiment is illustrated through the field situation

Summary

Introduction

The gas turbine produced by GE company is the type of PG9171E, which is composed of a starting motor with rated power of 1000KW, a 17-stage axial compressor, a combustion system composed of 14 combustion Chambers and a 3-stage turbine rotor. The axial compressor rotor and turbine rotor are connected by flanges, which have three supporting bearings. The gas turbine generator is air-cooled, three-phase, bipolar, 3000rpm, 50HZ ac, solid cast iron rotor synchronous generator, with 120MW output power (operating under base load). Exciter is an ac exciter with rotating diode rectifier, and the excitation mode is brushless excitation. The gas turbine shafting support structure is shown in figure 1.1

Fault overview

Vibration monitoring analysis and processing

Conclusion