Functional Diagrams; Functional Diagrams For Protection - ABB REF615 Applications Manual

Section 3
REF615 variants
3.7.3
3.7.3.1
82
Binary output Default usage
X100-PO4 Open Circuit Breaker/trip coil 2
X110-SO1 Upstream Overcurrent Blocking
X110-SO2 Over current operate Alarm
X110-SO3 Earth fault operate Alarm
LED Default usage
1 Non-directional overcurrent protection operated
2 Directional earth-fault protection operated
3 Non-directional earth-fault protection operated
4 Negative-sequence overcurrent or phase discontinuity protection operated
5 Thermal overload protection operated
6 Circuit-breaker failure protection backup protection operated
7 Disturbance recorder triggered
8 Circuit-breaker condition monitoring alarm
9 Supervision alarm
10 Arc fault detected
11 Autoreclose in progress

Functional diagrams

The functional diagrams describe the default input, output, alarm LED and function-
to-function connections. The default connections can be viewed with SMT and
changed according to the application requirements, if necessary.
The analog channels, measurements from CTs and VTs, have fixed connections
towards the different function blocks inside the IED's standard configuration.
Exceptions from this rule are the 12 analog channels available for the disturbance
recorder function. These channels are freely selectable and a part of the disturbance
recorder's parameter settings, thus not included in the SMT functionality.
The analog channels are assigned to different functions as shown in the functional
diagrams. The common signal marked with 3I represents the three phase currents.
The signal marked with I
CT. The signal marked with U
delta connected VTs.
The EFHPTOC protection function block for double (cross-country) earth-faults uses
the calculated residual current originating from the measured phase currents.

Functional diagrams for protection

The following functional diagrams describe the IED's protection functionality in
detail and according to the factory set default connections in SMT.
represents the measured residual current via a core balance
0
represents the measured residual voltage via open
0
1MRS756378 D
Connector pins
X100-20-24
X110-14,15
X110-17,18
X110-20,21
REF615
Application Manual