Line differential protection relay with distance backup. Both units are suitable for lines of any voltage level, overhead or underground, multiterminal, and single or parallel circuits. IEC 61850 certified.

The DLF includes all the protection, control and measurement functions for a power line with or without series compensation, single or double breaker, and single pole or three pole tripping.

The fast differential unit, complemented by the external fault detector and the capacitive current compensation unit, protects lines with up to 5 terminals, even with a transformer in the protection zone, providing excellent reliability even in the most adverse conditions.