Supervision functions of synchro-check relay SPAU 140 C. The encircled numbers refer to
the ANSI number of the concerned function. (ANSI = American National Standards Institute)
The network and the generator running in parallel with the network are connected together
through the line AB. When a fault occurs between A and B the relay protection opens the
circuit breakers A and B, thus isolating the faulty
section from the network and making the arc
that caused the fault extinguish. The first attempt to recover is a delayed auto-reclosure
made a few seconds later. Then the auto-reclose
relay gives a command signal to the synchrocheck relay to close the circuit breaker A. The
synchro-check relay SPAU 140 C performs a
voltage check, as the line AB is deenergized
(U1>Umax, U3< Umin). After verifying that the
line AB is dead and that the energizing direction is correct, the relay energizes the line (U1 -
> U3) by closing circuit breaker A. Then the
PLC of the power plant discovers that the line
has been energized and sends a signal to the
other synchro-check relay to close circuit breaker
B. Since both sides of circuit breaker B are live
(U1 > Umax, U3 > Umax), the synchro-check
relay controlling circuit breaker B performs a
synchro-check and, if the network and the generator are in synchronism, closes the circuit
breaker.
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