Effect of Internal Power-Angle on Turbo-Generator Stator Vibration Characteristics under Eccentricity Faults

汽輪發電機氣隙偏心故障下內功角對定子振動特性的影響

萬書亭(Shu-Ting Wan) ； 何玉靈(Yu-Ling He) ； 豆龍江(Long-Jiang Dou) ； 繩曉玲(Xiao-Ling Sheng)

《Journal of the Chinese Society of Mechanical Engineers》 Vol.36, No.3 (2015/06) Pp. 211-220

摘要

本文詳細分析了汽輪發電機氣隙靜偏心、動偏心、動靜複合偏心三類偏心故障時，內功角對定子振動特性的影響。首先推導了發電機氣隙偏心故障時的氣隙磁勢、磁導和磁密，並進一步推導得到了單位面積磁拉力公式。然後分別分析了內功角、氣隙磁勢和氣隙合成磁勢與主磁勢夾角的限制因素，推導得到了作用於定子的單位面積磁拉力以及定子振動特性，以此為基礎分析了內功角在氣隙靜偏心、動偏心及動靜複合偏心故障下對定子振動特性的影響。最後在SDF-9故障類比發電機上進行了實驗驗證，理論分析和實驗驗證表明，隨著發電機內功角的增大，定子振動將減小。本文研究結果對於發電機氣隙偏心故障的定向診斷及運行維護具有積極意義。

並列摘要

turbo-generator;stator;internal power-angle;eccentricity faults;vibration characteristics

並列關鍵字

This paper investigates the effect of the turbo-generator internal power-angle on the stator radial vibration characteristics under air gap static eccentricity, dynamic eccentricity, and mixed eccentricity faults. Firstly the air gap magnetomotive force, the magnetic permeance and the magnetic flux density of the eccentricity faults is deduced, and the formula of the magnetic pull per unit area is obtained. Then the restrictive factors of the magnetomotive force, the internal power-angle and the angle between the main magnetomotive force and the composite magnetomotive force are analyzed. The magnetic pull per unit area that acts on the stator is further deduced, and the stator vibration characteristics are given. Based on the deductions, the effect of the internal power-angle on the vibration characteristics is studied, the results show that the radial vibration amplitudes of the stator decrease as the internal power-angle increases no matter which one of the three eccentricity faults occurs. Finally the experiments are taken on a SDF-9 non-salient fault simulating generator to verify the theoretical results. The investigation results of this paper will be beneficial to air gap eccentricity faults diagnosis of turbo-generator.