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In meshed networks, distance protection is the central protection function in the feeder protection. SIPROTEC distance protection relays feature different starting criteria and extensive additional functions, achieve short tripping times, a high network stability, also in the fault case, as well as a high network availability by means of extensive auto-reclosure functions.
The SIPROTEC 4 7SA522 relay provides full-scheme distance protection and incorporates all functions usually required for the protection of a power line. The relay is designed to provide fast and selective fault clearance on transmission and subtransmission cables and overhead lines with or without series capacitor compensation. The power system star point can be solid or resistance grounded (earthed), resonant-earthed via Peterson coil or isolated. The 7SA522 is suitable for single-pole and three-pole tripping applications with and without tele (pilot) protection schemes.
The 7SA522 incorporates several protective functions usually required for transmission line protection.