ABB Relion 650 Series Applications Manual page 142

Section 10
Control
• The logical node Interlocking (SCILO, 3) provides the information to SCSWI whether it is
permitted to operate due to the switchyard topology. The interlocking conditions are
evaluated with separate logic and connected to SCILO (3).
• The Synchronism, energizing check, and synchronizing (SESRSYN, 25) calculates and compares
the voltage phasor difference from both sides of an open breaker with predefined switching
conditions (synchronism check). Also the case that one side is dead (energizing-check) is
included.
• The logical node Generic Automatic Process Control, GAPC, is an automatic function that
reduces the interaction between the operator and the system. With one command, the
operator can start a sequence that will end with a connection of a process object (for example
a line) to one of the possible busbars.
The overview of the interaction between these functions is shown in figure
136
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1MRK 505 287-UUS B
54 below.
Busbar protection REB650
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