...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>NETA World: The Official Publication of the InterNational Electrical Testing Association >Feature: Partial Discharge Analysis Ultrasonic Techniques to Evaluate Partial Discharge in Electrical Machinery
【24h】

Feature: Partial Discharge Analysis Ultrasonic Techniques to Evaluate Partial Discharge in Electrical Machinery

机译：功能：局部放电分析超声技术，以评估电机中的局部放电

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Partial discharges are small electrical sparks that occur within the electric insulation of switchgear, cables, transformers, and windings in large motors and generators. Partial discharge analysis is a proactive diagnostic approach that uses partial discharge (PD) measurements to evaluate the integrity of this equipment. Each discrete PD is a result of the electrical breakdown of an air pocket within the insulation. PD measurements can be taken continuously or intermittently and detected on-line or off-line. PD results are used to reliably predict which electrical equipment is in need of maintenance. Just as every material has a characteristic tensile strength, each material also has an electrical breakdown (dielectric) strength that represents the electrical intensity necessary for current to flow and an electrical discharge to take place. Common insulating materials such as epoxy, polyester, and polyethylene have very high dielectric strengths. Conversely, air has a relatively low dielectric strength. Electrical breakdown in air causes an extremely brief (lasting only fractions of a nanosecond) electric current to flow through the air pocket. The measurement of partial discharge is, in fact, the measurement of these breakdown currents.
机译：局部放电是在大型电动机和发电机的开关设备，电缆，变压器和绕组的电气绝缘体内产生的小电火花。局部放电分析是一种主动诊断方法，使用局部放电（PD）测量来评估此设备的完整性。每个离散的PD是绝缘体中气穴电击穿的结果。 PD测量可以连续或间歇进行，并且可以在线或离线进行检测。 PD结果用于可靠地预测哪些电气设备需要维护。正如每种材料都具有独特的拉伸强度一样，每种材料也具有击穿（电介质）强度，该击穿强度表示电流流动和发生放电所需的电强度。常见的绝缘材料（例如环氧树脂，聚酯和聚乙烯）具有很高的介电强度。相反，空气具有相对较低的介电强度。空气中的电击穿会导致极短暂的电流（仅持续几分之一秒）流过气穴。实际上，局部放电的度量是这些击穿电流的度量。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号