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

Section 3
REF615 variants
3.6.3
3.6.3.1
70
LED
1
2
3
4
5
6
7
8
9
10
11

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
connection of the phase current transformers.

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.
Default usage
Non-Directional Overcurrent Operate
Non-Directional Earth fault Operate
Sensitive Earth fault Operate
Negative Seq. Overcurrent/Phase Discontinuity Operate
Thermal Overload Alarm
Breaker Failure Operate
Disturbance Recorder Triggered
Circuit Breaker Condition Monitoring Alarm
Trip Circuit Supervision Alarm
ARC Protection Operate
Auto Reclose in Progress
represents the measured residual current, via a summation
0
1MRS756378 D
REF615
Application Manual