Type MDT-A2  Distance Relay Scheme

The MDT-A2 is all static microprocessor based distance relay scheme capable of protecting modern power systems with voltage of 132kV, 220kV, 400kV, 500kV, etc.  Due to its high degree of reliability, selectivity, sensitivity and high speed tripping performance, it is possible for MDT-A2 to keep power systems stable from all kinds of faults at direct earthing system and free from unwarrantable tripping.

MDT-A2 distance relay scheme provides the complete three phase multi-zone distance protection both for phase and earth faults, and also, it is applicable in use with carrier aided schemes, auto-reclosing schemes, single and/or three phase tripping facilities, etc.

By means of new digital technology, [R (resistance), X (reactance)] from the relay to the fault point can be directly calculated with high accuracy even in the heavily distorted waves which are mostly produced in the large capacitive line fault.  Therefore the MDT-A2 can be applied to the cable line system in addition to the over-head line system.

And also continuous self-checking for micro-processing circuits will remarkably remarkably improve the relay availability. 

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