KDTG distance and timer relay

Type KDTG relay is a polyphase compensator type distance relay with a static two zone timer. The distance unit responds to phase-to-phase faults, two-phase-ground, and single phase-to-ground faults. This unit is identical in its response to the phase-to-phase unit of the KD-type distance relays and does not operate on three-phase faults. The KDTG relay is used with the KDXG ground reactance relays for directional supervision for high speed clearing of single phase-to-ground faults in the first zone of protection and to provide accurate time delayed switching of the reactance units to second and third zone settings. this relay is not subject to wrong directional sensing due to mutual induction on parallel lines. Zero sequence polarizing and operating quantities are not required for the KDTG relay.