Selected
to operate
1. Send reservation to other terminals
2. Receive response
Figure 835: Control procedure in the SBO method
9.2.5 Application
In the field of distribution and sub-transmission, automatic, reliable control and
status indication of primary switching components, both locally and remotely, are
of significant importance. They are needed especially in modern remotely controlled
substations.
P3SXSWI is designed to be used for the control of two- (open, closed) and three-
state (earthing switch closed, disconnector closed and both open) switches. The
function also handles user-defined interlocking logics and provides commands.
Control and status indication facilities are implemented in the same package with
P3SXSWI. When primary components are controlled in the energizing phase, for
example, the correct execution sequence of the control command must be ensured.
This can be achieved, for example, with interlocking based on the status indication
of the related primary components.
The interlocking on the substation level can be applied using the IEC 61850 GOOSE
message between feeders.
1MRS759142 F
Control functions
REX640
Technical Manual
1529
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