3.3.2.1 Default I/O connections
Binary Input Default usage Connector-Pins
X120-BI1 Blocking of Overcurrent Instantaneous Stage X120-1,2
X120-BI2 Circuit Breaker Closed position indication X120-3,2
X120-BI3 Circuit Breaker Open position indication X120-4,2
Binary Output Default usage Connector-Pins
X100-PO1 Close Circuit Breaker X100-6,7
X100-PO2
Circuit Breaker Failure protection trip to upstream
breaker X100-8,9
X100-PO3 Open Circuit Breaker / trip coil 1 X100-16,17,18,19
X100-PO4 Open Circuit Breaker / trip coil 2 X100-20,21,22,23
X100-SO1 General Start Indication X100-10,11,12
X100-SO2 General Operate Indication X100-13,14,15
LED Default usage
1 Non-Directional Overcurrent Operate
2 Directional/Intermittent Earth fault Operate
3 Double (Cross country) Earth fault Operate
4 Negative Seq. Overcurrent/Phase Discontinuity Operate
5 Thermal Overload Alarm
6 Breaker Failure Operate
7 Disturbance Recorder Triggered
8 Not connected
9 Trip Circuit Supervision Alarm
10 ARC Protection Operate
11 Auto Reclose in Progress
3.3.3 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.
Section 3 1MRS756378 D
REF615 variants
36 REF615
Application Manual
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