The Effect of Conventional Instrument Transformer Transients on Numerical Relay Elements
نویسندگان
چکیده
Current and voltage transducers provide instrument level signals to protective relays. Protective relay accuracy and performance are directly related to the steady state and transient performance of the instrument transformers. Protective relays are designed to operate in a shorter time than the time period of the transient disturbance during a system fault. Large instrument transformer transient errors may delay or prevent relay operation. In this paper, we describe the effect of conventional instrument transformer transients on numerical relay elements and discuss numerical relay designs that cope with conventional instrument transformer transients. The elements we examine include distance, line differential, and breaker failure.
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تاریخ انتشار 2001