Research on Torsional Vibration Monitoring System of Steam Turbine Generator Unit

2013 ◽  
Vol 8 (6) ◽  
pp. 1048-1057
Author(s):  
YANG Zhihe ◽  
HU Xuhuai ◽  
GUO Guangqi
Keyword(s):  
Steam Turbine ◽  
Monitoring System ◽  
Torsional Vibration ◽  
Vibration Monitoring ◽  
Turbine Generator ◽  
Generator Unit

Error Considerations for Turbine-Generator Torsional Vibration Monitoring

2020 ◽  
Author(s):  
Jindrich Liska ◽  
Jan Jakl ◽  
Sven Kunkel
Keyword(s):  
Power Systems ◽  
Torsional Vibration ◽  
Gas Turbines ◽  
Measurement Errors ◽  
Power Plants ◽  
Signal To Noise Ratio ◽  
Vibration Monitoring ◽  
Turbine Generator ◽  
Turbine Generators ◽  
Incremental Encoder

Abstract Turbine-generator torsional vibration is linked to electrical events in the power grid by the generator air-gap torque. Modern power systems are subject to gradual transformation by increasing flexibility demands and incorporation of renewable resources. As a result, electrical transient events are getting more frequent and thus torsional vibration is getting more and more attention. Especially in the case of large steam and gas turbines torsional vibration can cause material fatigue and present a hazard for safe machine operation. This paper freely builds on previous work, where a method for torsional vibration evaluation using an incremental encoder measurement was presented, in that it supplements error considerations to this methodology. Measurement errors such as precision of the rotor encoder manufacturing, choice of the proper sensor, its signal to noise ratio and the error of instantaneous velocity computation algorithm are analyzed. The knowledge of these errors is essential for torsional vibration as there is an indirect and relatively complicated path from the measurement to the final torsional vibration results compared to other kinds of vibration. The characteristics of particular errors of the processing chain are validated both on experimental data from a test rig as well as field data measured on turbine-generators in power plants.

Vibration monitoring and diagnostic system of a turbine-generator unit

1988 ◽  
Vol 22 (7) ◽  
pp. 427-430
Author(s):  
V. I. Kolesnikov ◽  
V. F. Dolgii ◽  
A. N. Chakhirev ◽  
V. E. Semenikhin
Keyword(s):  
Diagnostic System ◽  
Vibration Monitoring ◽  
Turbine Generator ◽  
Generator Unit

Torsional Vibration Analysis and Stress Calculation for the Fault 600MW Steam Turbine Generator Shaft System

2009 ◽  
Author(s):  
Dongxiang Jiang ◽  
Liangyou Hong ◽  
Zheng Wang ◽  
Xiaorong Xie
Keyword(s):  
Steam Turbine ◽  
Torsional Vibration ◽  
Operation Condition ◽  
Turbine Generator ◽  
Modal Shape ◽  
Subsynchronous Oscillation ◽  
Root Cause ◽  
Shaft System ◽  
Mass Element ◽  
Rotor Dynamic

Subsynchronous oscillation (SSO) or torsional vibration may cause shaft of steam turbine generator hurt heavily. This phenomenon has destroyed two generator shafts in one of China’s power plant in 2008. Detailed analysis and several measurements have been taken to identify the reason of the accident. First, the operational data is analyzed, including field torsional vibration dada. Then, the modal of the shaft system is calculated. Each torsional vibration frequency is gotten with corresponding modal shape. Dangerous location of the shaft system is obtained. Third, torque value of different operation condition is calculated based on two different models: one is traditional multiple mass element rotor dynamic model and the other is an four mass element electromechanical model of rotor oscillation. Following, the maximum stress on the dangerous location is calculated using finite element method. Finally, the root cause of shaft destruction is analyzed and identified.

Design of 321-Mw Cross-Compound Steam Turbine—River Rouge Unit No. 3

1959 ◽  
Vol 81 (2) ◽  
pp. 123-131
Author(s):  
C. D. Wilson
Keyword(s):  
Steam Turbine ◽  
Size Range ◽  
Design Features ◽  
Turbine Generator ◽  
General Arrangement ◽  
Generator Unit

This paper discusses the design features and general arrangement of a 321-mw close-coupled cross-compound 3600/1800-rpm steam turbine-generator unit. The machine is designed for operation with subcritical pressures and with steam temperatures that permit using ferritic materials. It was the first machine to be ordered in the 300-mw size range and is installed in the River Rouge Station of The Detroit Edison Company.

Assessing the Flaws in Welded Seam of Header of a 300MW Steam Turbine Generator Unit

2007 ◽  
Vol 340-341 ◽  
pp. 1431-1436
Author(s):  
Li Song ◽  
Shui Cheng Yang ◽  
Feng Tao Wei
Keyword(s):  
Steam Turbine ◽  
Slag Inclusion ◽  
Normal Operation ◽  
Residual Service Life ◽  
The Finite Element Method ◽  
Turbine Generator ◽  
Warm Start ◽  
Generator Unit ◽  
Welded Seam ◽  
Non Destructive

The flaws such as crack or slag inclusion, in the welded seam of header of a 300MW steam turbine generator unit, were detected by the ultrasonic non-destructive inspection. Based on the crack modeling, the finite element method (FEM) was used to calculate and analyze the displacement field, stress field and stress intensity factors of the cracks under the conditions of warm start, cold start and normal operation, and the residual service life was predicted. Analyzing results showed that these flaws would not bring about primary brittle fracture and propagation of crack was harmless to safe in operation.

An Investigation of Excitation Method for Torsional Testing of a Large-Scale Steam Turbine Generator

2004 ◽  
Vol 126 (1) ◽  
pp. 163-167 ◽  
Author(s):  
Yong Chen
Keyword(s):  
Steam Turbine ◽  
Torsional Vibration ◽  
Large Scale ◽  
Current Method ◽  
Field Testing ◽  
Turbine Generator ◽  
Higher Modes ◽  
Rotor Systems ◽  
Generator Rotor ◽  
Torsional Testing

Presently, the “negative sequence current method” is widely used in field-testing to determine torsional vibration characteristics of steam turbine generator rotor systems. The natural frequencies of lower modes of vibration can be determined effectively in this way, but higher modes cannot be readily excited. To understand this phenomenon, modal analysis was employed to digitally simulate the dynamic response obtained in torsional vibration testing of a 200MW steam turbine generator rotor system. The calculations were consistent with field experimental results, showing that higher modes are difficult to excite by this method. The research also indicated that higher modes could be excited by certain experimental procedures. The conclusions provide guidelines for future field-testing of large-scale systems.

Design of 1000-MW Steam Turbine-Generator Unit for Ravenswood No 3

1964 ◽  
Vol 86 (2) ◽  
pp. 209-218
Author(s):  
J. M. Driscoll ◽  
C. D. Wilson ◽  
L. T. Rosenberg
Keyword(s):  
Steam Turbine ◽  
High Reliability ◽  
Low Pressure ◽  
Design Features ◽  
World Record ◽  
Turbine Generator ◽  
Efficient Performance ◽  
Generator Unit ◽  
Steam Cycle

Consolidated Edison’s 1000-mw steam turbine-generator unit for Ravenswood No. 3 will operate on a 2400-psig, 1000/1000 F steam cycle. Arrangement is close-coupled 3600/1800-rpm, cross compound, with all five turbines double flow. Both generators are of fully supercharged, hydrogen-cooled design. At each end of the 3600-rpm shaft are direct-driven half-size boiler-feed pumps while the big units two gear-driven exciters are in tandem at the generator end of the 1800-rpm shaft. The three double-flow, low-pressure turbines use 40-in. exhaust spindle blades. This world-record unit incorporates design features to assure fast starting and loading, high reliability, and efficient performance.

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