The KDXG relay is a high speed single phase distance relay of reactance type. Three KDXG relays are used in conjunction with a ground directional-unit timer relay, and an auxiliary current transformer Type IK for transmission line protection from a single phase-to-ground fault within 3 zones of protection.
A ground directional-unit timer relay is required with the KDXG relays. Either a KRT or KDTG relay provides this function.
The KDTG should be used to avoid incorrect directional sensing where zero sequence system isolation may occur and zero sequence mutual exits. It is insensitive to line energizing transients and does not require zero sequence current for its operation.
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