The SIPROTEC 7SD610 und 7SD5 line differential protection have been designed particularly for the selective protection of overhead lines and cables with single-ended and multi-ended infeed in medium-voltage and high-voltage systems. Transformers and compensating coils in the protection range are also possible. The SIPROTEC 7SD5 is also available as combined line differential and distance protection device. With the high-performance DIGSI 4 engineering tool, the SIPROTEC 4 devices offer user friendly system solutions for protection, automation and with high field experience and security.