Differential protection relay SIPROTEC 7SD series

over-voltageover-frequencyover-speed

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. Features It is designed to provide differential and directional back-up protection for all voltage levels and types of networks. The relay features high speed and phase-selective short circuit measurement. The unit is thus suitable for single-phase and three-phase fault clearance. Digital data communication for differential current measurement is effected via fiberoptic cables, networks or pilot wires connections, so that the line ends can be quite far apart. The serial protection interface (R2R interface) of the relay can flexibly be adapted to the requirements of all existing communication media. If the communication method is changed, flexible retrofitting of communication modules to the existing configuration is possible. Apart from the main protection function, i.e. the differential protection, the SIPROTEC 7SD610 has a full range of configurable emergency and / or back-up protection functions such as phase and earth overcurrent protection with directional elements if voltage transformers are connected.