Functional Diagrams For Protection - ABB REU615 Applications Manual

Section 3
REU615 standard configurations
3.5.3.1
48
The functional diagrams describe the default input, output, alarm LED and function-
to-function connections. The default connections can be viewed and changed with
PCM600 according to the application requirements, if necessary.
The analog channels, measurements from current transformers and voltage
transformers, have fixed connections towards the different function blocks inside
the IED's standard configuration. Exceptions from this rule are the eight analog
channels available for the disturbance recorder function. These channels are freely
selectable and a part of the disturbance recorder's parameter settings.
The analog channels are assigned to different functions. The common signal
marked with 3I represents the three phase currents and 3U represents the three
phase voltages. The signal marked with Uo represents the measured residual
voltage via open-delta connected voltage transformers. The signal marked with Io
represents the measured residual current, via a sum connection of second current
transformer cores of the phase current transformers.

Functional diagrams for protection

The functional diagrams describe the IED's protection functionality in detail and
picture the factory set default connections.
GUID-2125AE49-AD79-460A-AF83-3965D2F06F2F V1 EN
Figure 23: Overcurrent protection
1MRS757054 A
REU615
Application Manual