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Apparatus control
•
Each apparatus can be interlocked
•
The breakers can be connected to synchrocheck/energizing check/phasing function
•
Reservation of bays
•
Supervision of status of primary apparatus
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A bay can handle, for examples a power line, a transformer, a reactor, or a capacitor
bank. The different high-voltage apparatuses within the bay level can be controlled di-
rectly by the operator or indirectly by sequences. The different apparatuses can also be
controlled automatically.
Because a high-voltage apparatus can be allocated to many functions within a Substa-
tion Automation system, the object-oriented approach with an internal module that han-
dles the interaction and status of each process object ensures consistency in the process
information used by higher-level control functions.
High-voltage apparatuses such as breakers and disconnectors are controlled and super-
vised by one software module each. Because the number and type of signals connected
to a breaker and a disconnector are almost the same, the same software is used to handle
these two types of apparatuses.
The software module is connected to the physical process unit in the switchyard by a
number of digital inputs and outputs. Special function blocks were created for making
bay and apparatus control programs as efficient as possible. Four types of function
blocks are available to cover most of the control and supervision within the bay.
The different functions included in the apparatus control are described below.
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The apparatus can be controlled from three different operator places:
•
Remote
•
Station
•
Local
The operator places have different priorities:
•
Local (highest)
•
Station
•
Remote (lowest)
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