Relevancy of IEC Requirements Related to Switching Cable and Line Charging Currents for Medium Voltage Vacuum Circuit Breakers (VCB)

2006 International Symposium on Discharges and Electrical Insulation in Vacuum Pub Date : 2006-09-01 DOI:10.1109/DEIV.2006.357335

A. Chaly, I. N. Poluyanova

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引用次数: 1

Abstract

An analysis of switching processes at interruption of lightly loaded urban and rural networks with the aid of VCB has been provided. It has been found that typical loading of the distribution feeders result in virtual absence of recovery voltage shift being the main reason for non-sustained disruptive discharges (NSDD). Truly unloaded situation is interruption of section located between neighbouring points of isolation in cable line, but 95% of lengths of these sections are less than 3km that is substantially shorter than ~50km lengths considered by standard. This difference results in different duration of current pulses relevant for VCB closing in real and test cases. Estimation of the probability of contact micro welding has shown that in real case probability of contact welding is much lowers which results in lower probability of NSDD. On the basis of the above irrelevancy of the current IEC requirement with regard to general purpose VCB has been stated. Alternative test procedure for special purpose VCB has also been offered

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与中压真空断路器(VCB)开关电缆和线路充电电流相关的IEC要求的相关性

本文分析了轻负荷市网和农村市网在负荷中断时的切换过程。研究发现，配电馈线的典型负荷导致恢复电压漂移的缺失，是造成非持续中断放电的主要原因。真正的卸载情况是位于电缆线路中相邻隔离点之间的部分中断，但这些部分的95%长度小于3km，大大短于标准考虑的~50km长度。这种差异导致实际和测试用例中与压断路器合闸相关的电流脉冲持续时间不同。对接触微焊接概率的估计表明，在实际情况下，接触微焊接的概率要低得多，这就导致了非碰撞损伤的概率较低。在上述基础上，已经说明了当前IEC要求与通用断路器的不相关性。此外，还提供了特殊用途断路器的替代测试程序

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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2006 International Symposium on Discharges and Electrical Insulation in Vacuum

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