Improving the protection of EHV teed feeders using local agents

This paper discusses the adaptation of the settings of distance relays for multi-terminal lines employing agents. Agents are software processes capable of searching for information in networks, interacting with pieces of equipment and performing tasks on behalf of their owners (relays). Moreover, they are autonomous and cooperative. Very few publications concerning the application of agents in the protection field have been reported in the literature. Y Tomita et al. (see IEEE Trans. on Power Delivery, vol.13, no.4, p.1060-6, 1998) proposed a cooperative protection system utilizing agents. Relay agents were constructed, and the cooperation of the main agents was simulated for primary, backup and adaptive protection. Results illustrating the improved performance of the adaptive method proposed compared to conventional fixed settings are presented in the paper