Progress in DC Testing of Generator Stator Windings: Theoretical Considerations and Laboratory Tests
Progress in DC Testing of Generator Stator Windings: Theoretical Considerations and Laboratory Tests
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DOI：
10.1109/tec.2009.2025410
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发表时间：
2010-03
影响因子：
4.9
通讯作者：
É. David;L. Lamarre
中科院分区：
文献类型：
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作者：
É. David;L. Lamarre
由于定子绝缘系统的机械应力、热应力、电应力和环境应力而引起的老化固有地涉及到对其服务操作有害的材料特性的改变。当这些性能恶化到材料在正常应力条件下不再能安全运行的程度时，意味着它已经达到了使用寿命的终点。为防止此类强制断电并延长使用寿命，定期对定子绝缘系统进行基于状态的维护和诊断测试。在为评估绕组绝缘状况而执行的测试中，通常使用各种方法，例如局部放电测量、高压测试、阶跃电压和斜坡电压测试（RT），仅举几例。直流测试（其中，无论是在阶跃电压测试（诸如极化/去极化测试）期间，还是在线性增加电压测试（诸如RT）期间，连续地监测电流）通常用于本领域中，以便评估大型同步旋转电机的定子绕组绝缘系统的质量。这两种测试都与绝缘系统的介电响应有关。本文介绍了在现场遇到的各种类型的电机绕组绝缘系统的介电响应的理论考虑，以及对个别酒吧和线圈的实验室结果。
The aging due to mechanical, thermal, electrical, and environmental stresses of a stator insulation system inherently involves alterations of the material properties that are detrimental to its service operation. When these properties are deteriorated to the point where the material can no longer operate safely under normal stress conditions, it implies that it has reached the end of its useful life. To prevent such forced outages and improve the useful life, condition-based maintenance and diagnostic tests are periodically conducted on stator insulation systems. Among the tests performed to assess the condition of winding insulation, various methods are commonly used, such as partial discharge measurements, hipot, step voltage, and ramped voltage tests (RTs), to name just a few. DC testing, where the current is continuously monitored, whether during a step voltage test, such as the polarization/depolarization test, or during a linearly increasing voltage test, such as the RT, is commonly used in the field in order to assess the quality of stator winding insulating systems of large synchronous rotating machines. Both of these tests are related to the dielectric response of the insulation system. This paper presents theoretical considerations on the dielectric response of the various types of machine winding insulation systems encounter in the field as well as laboratory results on individual bars and coils.