GUID-6D58C7F7-C41B-405E-B8F5-F6BDA25A6927 V1 EN
Figure 10. Autosynchronizer application
In addition to conventional protection, control, measurement
and supervision duties, REX640 can perform both generator
(APP11) and non-generator (APP12) circuit breaker
synchronizing. Successful synchronization of two alternating
power sources can be done by matching their voltage,
frequency, phase sequence and phase angle. The circuit
breaker (CB) connects the two sources after a period of CB
closing time from the instant of a given close command. Hence,
all the conditions of synchronization need to be met at the
instant of CB close operation for successful synchronization.
Each REX640, being part of the overall synchronizing scheme,
contains its own synchronizer function. When a generator CB is
to be synchronized, the related REX640 controls the
generator’s voltage, frequency and angle difference by
requesting the generator’s AVR and prime mover’s governor to
change the set-points accordingly. The generator circuit
breaker synchronizing does not require information exchange
between other REX640 relays within the scheme.
When a non-generator CB is to be synchronized, all the REX640
relays within the scheme exchange information between
themselves in order to identify suitable generator(s) for the
voltage and frequency matching. Once the generators are
identified and selected, the REX640 related to the circuit
breaker to be synchronized sends a request to the selected
generator(s) REX640 for the required voltage and frequency
corrections. When the voltage, frequency and the angle
difference across the CB under synchronization are within the
set limits, REX640 closes the circuit breaker. The information
1MRS759144 A
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