capacity and bandwidth than the SBO method, because the procedure needs fewer
messages for accurate operation.
The “status-only” mode means that control is not possible (non-controllable) via
communication or from LHMI. However, it is possible to control a disconnector
(DCXSWI) from
AU_OPEN
and
AU_CLOSE
inputs.
AU_OPEN
and
AU_CLOSE
control the object directly regardless of the set
Control model. These inputs can be used when control is wanted to
be implemented purely based on ACT logic and no additional exception
handling is needed. However, in case of simultaneous open and close
control, the open control is always prioritized.
1. Send reservationto other terminals
2. Receive response
Selected
to operate
REF 615
REF 615
REF 615
REF 615
REF 615
Figure 519: Control procedure in the SBO method
Local/Remote operations
The local/remote selection affects CBXCBR, DCXSWI and ESXSWI.
• Local: the opening and closing via communication is disabled.
• Remote: the opening and closing via LHMI is disabled.
•
AU_OPEN
and
AU_CLOSE
inputs function regardless of the local/remote selection.
9.1.5
Application
In the field of distribution and sub-transmission automation, reliable control and
status indication of primary switching components both locally and remotely is
in a significant role. They are needed especially in modern remotely controlled
substations.
Control and status indication facilities are implemented in the same package
with CBXCBR, DCXSWI and ESXSWI. When primary components are controlled in
the energizing phase, for example, the correct execution sequence of the control
commands must be ensured. This can be achieved, for example, with interlocking
1MRS757644 H
Control functions
620 series
Technical Manual
987
