Operation Principle - ABB RED650 Technical Manual

1MRK 505 394-UEN A
12.4.2
Line differential protection RED650 2.2 IEC
Technical manual
In normal security, the command is processed and the resulting position is not
supervised. However with enhanced security, the command is processed and the
resulting position is supervised.
Normal security means that only the command is evaluated and the resulting
position is not supervised. Enhanced security means that the command is evaluated
with an additional supervision of the status value of the control object. The
command sequence with enhanced security is always terminated by a
CommandTermination service primitive and an AddCause telling if the command
was successful or if something went wrong.
Control operation can be performed from the local HMI with authority control if so
defined.
The switch controller SCSWI initializes and supervises all functions to properly
select and operate switching primary apparatuses. Each of the 10 switch controllers
SCSWI may handle and operate on one three-phase apparatus.
Each of the 3 circuit breaker controllers SXCBR provides the actual position status
and pass the commands to the primary circuit breaker and supervises the switching
operation and positions.
Each of the 9 circuit switch controllers SXSWI provides the actual position status
and pass the commands to the primary disconnectors and earthing switches and
supervises the switching operation and positions.

Operation principle

A bay can handle, for example a power line, a transformer, a reactor, or a capacitor
bank. The different primary apparatuses within the bay can be controlled via the
apparatus control functions directly by the operator or indirectly by automatic
sequences.
Because a primary apparatus can be allocated to many functions within a
Substation Automation system, the object-oriented approach with a function block
that handles the interaction and status of each process object ensures consistency in
the process information used by higher-level control functions.
Primary apparatuses such as breakers and disconnectors are controlled and
supervised by one function block (SCSWI) each. Because the number and type of
signals used for the control of a breaker or a disconnector are almost the same, the
same function block type is used to handle these two types of apparatuses.
The SCSWI function block is connected to an SXCBR function block (for circuit
breakers). The physical process in the switchyard is connected to these two
function blocks via binary inputs and outputs.
Three types of function blocks are available to cover most of the control and
supervision within the bay. These function blocks are interconnected to form a
Section 12
Control
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