Abstract

Protection system is one of the important parts of the power system. The protection system can be accepted if and only if it is efficient, reliable and realizes some requirements. For protection of transmission line three stepped distance protection can provide remote backup protection to transmission line by zone two and zone three, but during the calculation of operation setting for different protection zones of the distance relays, some problems have been raised (overlap and under reach). These problems cause improper trips in the network. The aims at overcoming the problems are by taking into consideration the specifications of the adjacent transmission lines, the effect of arc resistance, earth resistance and the effect of remote in feed. The line insurance plans are made out of separation transfers and directional overcurrent transfers where the setting of the transfers must be figured thinking about the two transfers. Separate hand-off calculation would prompt loss of selectivity. The standard joined with the contemplations of zone stumbling time have been utilized so as to defeat the coordination issues with the fundamental security (separation insurance) as a nearby assurance and to give remote reinforcement security to the next overcurrent transfers in the matrix. In this strategy, the security of the transmission lines in run of the mill transport bars framework has been explored in detail. The best possible settings for both fundamental security (for example separation security) and reinforcement insurance (for example overcurrent security) gadgets have been resolved. Have been utilized as mimicking apparatuses to approve the assurance settings methods of the transfers. Three methodologies of settings have been utilized for the referenced transfers. The correct settings of the two transfers of the whole undertaking

Paper Details