Application of Sectionalizers on Distribution Systems

Sectionalizers, properly applied, can be an integral part of the distribution protection scheme. A properly designed scheme is an essential component of a reliable power delivery system. Where coordination is difficult or impossible with traditional fault interrupting devices, sectionalizers can be an effective solution. Many of the issues related to improper operation are a result of how and where the device is applied. Successful application of sectionalizers requires an understanding of their operation, their proper role in the overall scheme, and the training of operations personnel in troubleshooting circuits where they are applied. This paper addresses the essential attributes of integrating sectionalizers into the protection scheme, as well as potential pitfalls and failure modes and how they can be minimized. Coordination with other protective devices and device reach will be discussed along with their potential impact on reliability