It can be used as restricted earth

fault or, as three functions are included, also as

differential protection on autotransformers, as

differential protection for a tertiary connected

reactor, as T-differential protection for the

transformer feeder in a mesh-corner or ring

arrangement, as tertiary bus protection and so on.

Tripping from Pressure relief/Buchholz and

temperature devices can be done through the

transformer IED where pulsing, lock-out contact

output and so on, is performed. The binary inputs

are heavily stabilized against disturbance to

prevent incorrect operations at for example, dc

system capacitive discharges or DC earth faults.

Distance protection functionality for phase-to

phase and/or phase-to-earth faults is available as

back-up protection for faults within the

transformer and in the connected power system.