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首页> 外文学位 >Technologies for Improved Reliability of Shielded Power Cable and Characterization of Capacitor Film Energy Density.
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Technologies for Improved Reliability of Shielded Power Cable and Characterization of Capacitor Film Energy Density.

机译：改善屏蔽电力电缆可靠性和电容器膜能量密度表征的技术。

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摘要

Partial Discharge (PD), a partial breakdown of insulation between high voltage electrodes, reduces cable reliability. Understanding electromagnetic propagation of PD-induced pulses in shielded power cable, including attenuation and dispersion, is essential to the application of PD diagnostics and, especially, PD location. Dispersion is caused by the transition of cable semicon-ducting layers (between the cable conductors and dielectric) from "resistive" at low frequency to "capacitive" at high frequency. Methods are presented to compute dispersion as a function of semiconducting material properties and evaluate the effect of dispersion on pulse characteristics (amplitude, shape, and width, etc.) as a function of distance propagated, the results of which are applied to investigate the effects of dispersion for PD detection and location. The location error induced by dispersion can be compensated from calibration.;Electrochemical degradation of cable dielectrics, known as "water treeing", is one of the leading cause of premature failures in underground shielded power cable. Silane-based fluid has been used successfully for decades to rejuvenate HMWPE and XLPE dielectric cables to "cure" existing water trees and extend cable life. However the ability of the treatment to inhibit future water tree initiation is not known. A method for silane fluid treatment of un-aged cable insulation and semicon was developed based on the use of GC/MS to determine curing of the fluid within the dielectric. A wet electrical aging test at 5 kV/mm (127 V/mil) based on a sample which includes semicon electrodes on both sides of the XLPE insulation with a water electrode in contact with one semicon layer was used to age untreated samples, samples treated prior to the test, and samples treated at the mid-time of the test (3500 hrs). The result of aging is analyzed by microscopic examination to determine the number, length and types of water trees. The mechanism by which the silane-based fluid cures existing water trees and impedes the formation of future water trees is addressed.;To characterize polymeric capacitor film, a solid state, high voltage switch rated 8 kV with a turn-on time in the range of 100 ns and current capability from muA to kA was developed based on the use of two SCR's in series. The system is used to measure energy release from linear and nonlinear dielectrics as a function of discharge time constant. Sufficient current is injected into the gates of the SCR's that the switch operates well from muA to kA with low current turn-on duration in the range of a second.
机译：局部放电（PD）是高压电极之间的部分绝缘击穿，降低了电缆的可靠性。了解局部放电感应脉冲在屏蔽电力电缆中的电磁传播，包括衰减和色散，对于局部放电诊断尤其是局部放电定位的应用至关重要。分散是由电缆半导体层（在电缆导体和电介质之间）从低频的“电阻性”过渡到高频的“电容性”引起的。提出了根据半导体材料特性计算色散的方法，并根据传播距离的距离评估色散对脉冲特性（振幅，形状和宽度等）的影响，并将其结果用于研究影响用于PD检测和定位的色散。可以通过校准来补偿由分散引起的定位误差。电缆电介质的电化学降解，被称为“水树”，是地下屏蔽电力电缆过早失效的主要原因之一。数十年来，基于硅烷的流体已成功用于使HMWPE和XLPE介电电缆焕发青春，以“治愈”现有的水树并延长电缆寿命。然而，该治疗抑制未来水树引发的能力尚不清楚。基于GC / MS的使用来确定电介质中流体的固化，开发了一种用于对未老化电缆绝缘层和半导体进行硅烷流体处理的方法。基于样品的5 kV / mm（127 V / mil）湿电老化测试，该样品在XLPE绝缘体的两侧均包括半导体电极，并且水电极与一个半导体层接触，用于老化未经处理的样品，在测试之前，以及在测试中期（3500小时）处理样品。通过显微镜检查分析衰老的结果，以确定水树的数量，长度和类型。解决了基于硅烷的流体固化现有水树并阻止未来水树形成的机理。;为了表征聚合物电容器薄膜，额定开启电压为8 kV的固态高压开关的接通时间范围为100 ns的电流和从muA到kA的电流能力是基于两个串联的SCR的使用而开发的。该系统用于测量线性和非线性电介质释放的能量，该能量是放电时间常数的函数。足够的电流注入到SCR的栅极中，从而使开关从muA到kA都能很好地工作，并且电流导通持续时间短于一秒。

著录项

  • 作者

    Shu, Wen.;

  • 作者单位

    University of Connecticut.;

  • 授予单位 University of Connecticut.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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