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Wide-Frequency Finite Element Based Model for Partial Discharge Pulse Propagation in Stator Winding of Generators
IEEE Transactions on Power Delivery ( IF 4.4 ) Pub Date : 2022-08-01 , DOI: 10.1109/tpwrd.2022.3195251
Arash Abyaz 1 , Mohammad Hamed Samimi 1 , Amir Abbas Shayegani Akmal 1
Affiliation  

Condition monitoring of generators is one of the main keys to reduce outages and keep the system stable during disturbances. The partial discharge (PD) test is among the most reliable tools for diagnosing generator insulation defects in the early stages. However, various studies show that it is impossible to correlate the measurement results with the apparent charge of the occurred PD in the generator winding. Therefore, no specific threshold can be set for the harmful PD activities in the generator stator windings. Modeling the stator winding for PD pulse propagation helps to interpret the PD test results properly. In this regard, this paper presents a finite element method (FEM)-based model with acceptable accuracy in a wide frequency range. Practical laboratory tests performed on stator bars are used to validate the model. The results and findings of the proposed model are fully matched with practical tests. Also, the proposed model covers the features obtained for PD pulse propagation in previous experimental studies. The proposed model can be employed to investigate the PD pulse propagations at both low and high frequencies, which is an important tool to analyze the results of a PD test correctly.

中文翻译:

发电机定子绕组局部放电脉冲传播的宽频有限元模型

发电机的状态监测是减少停电和在扰动期间保持系统稳定的主要关键之一。局部放电 (PD) 测试是早期诊断发电机绝缘缺陷的最可靠工具之一。然而,各种研究表明,不可能将测量结果与发电机绕组中发生局部放电的视在电荷相关联。因此,无法针对发电机定子绕组中有害的局部放电活动设置特定的阈值。为 PD 脉冲传播建模定子绕组有助于正确解释 PD 测试结果。在这方面,本文提出了一种基于有限元法 (FEM) 的模型,该模型在较宽的频率范围内具有可接受的精度。在定子线棒上进行的实际实验室测试用于验证该模型。所提出模型的结果和发现与实际测试完全匹配。此外,所提出的模型涵盖了在先前的实验研究中为 PD 脉冲传播获得的特征。所提出的模型可用于研究局部放电脉冲在低频和高频下的传播,这是正确分析局部放电测试结果的重要工具。
更新日期:2022-08-01
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