Function Block; Functionality; Operation Principle - ABB RED615 Technical Manual

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1YHT530004D05 D

Technical Manual

Function block

GUID-9EB77066-518A-4CCC-B973-7EEE31FAE4F1 V3 EN

The three-phase overcurrent protection DPHxPDOC is used as one-phase, two-

phase or three-phase directional overcurrent and short-circuit protection for feeders.

DPHxPDOC starts up when the value of the current exceeds the set limit and

directional criterion is fulfilled. The operate time characteristics for low stage

DPHLPDOC and high stage DPHHPDOC can be selected to be either definite time

(DT) or inverse definite minimum time (IDMT).

In the DT mode, the function operates after a predefined operate time and resets

when the fault current disappears. The IDMT mode provides current-dependent

timer characteristics.

The function contains a blocking functionality. It is possible to block function

outputs, timers or the function itself, if desired.

The function can be enabled and disabled with the Operation setting. The

corresponding parameter values are "On" and "Off".

The operation of directional overcurrent protection can be described using a

module diagram. All the modules in the diagram are explained in the next sections.

Protection functions

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