变压器和母线保护误操作及如何避免

S. Turner
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引用次数: 0

摘要

本文的第一部分分析了一起变压器差动误操作,该误操作导致东部沿海为相当大的一块连续负荷服务的并联大型配电变压器对丢失。本节给出了在不需要的操作期间由数字变压器保护继电器测量的未滤波电流。故障配电馈线CT因大电流饱和而发生误操作。提出了如何防止这类误操作的建议。第二部分分析了另一个配电变电站在不到一个月的时间内,由于快速母线跳闸方案的误操作和保护其中一条23kv馈线的数值过流继电器的缺陷而发生的两次停电事故。本文概述了快速公交行程方案逻辑的修改,以防止此类中断再次发生。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transformer and bus protection misoperations and how to avoid them
The first section of the paper analyzes a transformer differential misoperation that dropped a paralleled pair of large distribution transformers serving a sizeable block of contiguous load on the eastern seaboard. This section presents the unfiltered currents measured by the numerical transformer protection relay during the unwanted operation. The misoperation occurred when the faulted distribution feeder CT saturated due to the high magnitude fault current. A recommendation is made how to prevent these types of misoperations. The second section of the paper analyzes two outages that occurred at another distribution substation in less than one month due to the misoperation of the fast bus trip scheme and a defect in the numerical overcurrent relay protecting one of the 23 kV feeders. The paper outlines the modification of the fast bus trip scheme logic to prevent this type of outage from re-occurring.
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