Identification of Vibration Sparks in a Large Hydrogen-Cooled Generator Winding

2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA) Pub Date : 2019-01-01 DOI:10.1109/ROBOMECH.2019.8704769

Gomotso Phokojoe, J. Van Coller

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Abstract

The time domain-frequency domain characteristics of turbo-generator coil-to-core and packing-to-core Vibration Sparks (VS) can be determined and compared to known Partial Discharge (PD) and other non-VS discharge characteristics. The accurate characterisation of VS events is significant in the identification of this degradation mechanism in the slots of large generators. In this paper a new equivalent circuit, expressing the theoretical mechanism of VS involving a Side Ripple Spring (SRS) as a packing material in hydrogen-cooled machines, is presented. This is a variation of the direct coil-to-core air-cooled equivalent circuit model presented elsewhere. Furthermore an experimental circuit of a stator bar and SRS will be used to generate VS in order to determine their time domain-frequency domain characteristics. These can then be compared to those of PD and other non-VS type discharges using a cluster diagram to deduce if the phenomenon can be discriminated successfully in air-cooled and hydrogen-cooled turbo-generators.

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大型氢冷发电机绕组振动火花的识别

可以确定汽轮发电机线圈到铁芯和填料到铁芯振动火花(VS)的时域-频域特性，并将其与已知的局部放电(PD)和其他非局部放电特性进行比较。准确地描述VS事件对大型发电机槽内退化机理的识别具有重要意义。本文提出了一种新的等效电路，表达了氢冷却机器中以侧纹波弹簧(SRS)作为填料的VS的理论机制。这是在其他地方提出的直接线圈到铁心的风冷等效电路模型的变化。在此基础上，利用定子棒和SRS的实验电路产生VS，以确定它们的时域-频域特性。然后可以使用聚类图将这些与PD和其他非vs型放电进行比较，以推断是否可以在气冷和氢冷汽轮发电机中成功区分这种现象。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa (SAUPEC/RobMech/PRASA)

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