Effect of an additional large disturbance during power swings on the impedance seen by the out-of-step blocking function
Abstract This short article analyzes the effect of an additional large disturbance during power swings on the apparent impedances seen by the out-of-step blocking function of a distance relay. An additional large disturbance during power swings can imply a sudden change of the apparent impedance, which should be considered for the setting of out-of-step functions. The goal of this article is to describe this phenomenon, which has not been previously shown in the literature. A Venezuelan case is taken as an example, and the analyzed additional large disturbance is due to the operation of a special protective scheme for the islanding of one specific area. Maximization of the region between concentric characteristics and minimization of correspondent setting time can be useful actions to improve the expected behavior of out-of-step blocking functions. However, these actions are insufficient for the analyzed example, and two non-traditional solutions were proposed. In general, as these additional large disturbances could fortuitously occur when the apparent impedance is near of the trip region, the logical proper solution should be provided by future improvements of the algorithms from relay manufacturers. Highlights Major events during power swings can cause sudden changes of apparent impedances. This effect should be considered for setting the out-of-step blocking function. A Venezuelan case is taken as an example to show this effect. Conventional corrective actions could be insufficient to solve the problem. In the future, relay manufacturers could consider this effect in their algorithms.
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기