Input Source Error Concerns for Protective Relays

D. Angell, D. Hou
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引用次数: 18

Abstract

Capacitive coupled voltage transformers (CCVTs) and bushing potential devices (BPDs) have supplied high voltage relay potential circuits for many years. The transient performance of a CCVT has been analyzed, and solutions for their transient performance have been incorporated in relaying systems since the 1970s. Little analysis has been performed on BPD transient performance. A BPD has been tested and characterized to determine the parameters that affect the output voltage during system fault conditions. Current transformers (CTs) that saturate during system faults produce a nonsinusoid output that, when filtered, presents a reduced magnitude and phase shifted current to protective relays. The response of distance relays for various levels of CT saturation are analyzed and presented. Finally, utility experience with relays sourced by CCVTs and BPDs with the intent of validating the models and relay setting adjustments for input source errors are presented
保护继电器的输入源错误问题
电容耦合电压互感器(ccvt)和套管电位器件(bpd)多年来一直提供高压继电器电位电路。对CCVT的暂态性能进行了分析,并从20世纪70年代开始将其暂态性能的解决方案纳入继电器系统。对BPD暂态性能的分析很少。对BPD进行了测试和表征,以确定在系统故障条件下影响输出电压的参数。在系统故障期间饱和的电流互感器(ct)产生非正弦波输出,经滤波后,向保护继电器呈现幅度减小和相移的电流。分析并给出了距离继电器在不同CT饱和水平下的响应。最后,介绍了ccvt和bpd提供的继电器的实用经验,目的是验证模型和继电器设置调整输入源错误
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