Application - ABB RELION REX640 Technical Manual

Section 9
Control functions
9.6.6
1422
df s s − 0
=
dt 3
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3. With this df/dt value, the slip is brought back to approximately +2%.
Ten seconds later, the slip is brought to 0% with the same df/dt value. After ten
seconds, df/dt is calculated again and shown as monitored data output
FREQ_CHG_RTE.
The binary input BLOCK can be used to block the function. The activation of the
BLOCK input deactivates all binary outputs, binary monitored data and resets the
internal timers.

Application

A circuit breaker is used to connect two different power networks. It is essential to
ensure that these power networks are synchronized before closing the circuit breaker,
otherwise it may lead to disturbances in the power system, causing stress and damage
to the connected equipment.
ASGCSYN controls the closing of the generator circuit breakers in power networks;
it enables the closing after matching the voltage and frequency conditions to achieve
synchronism. ASGCSYN also participates in matching voltage and frequency
conditions for the network breaker synchronization.
ASGCSYN includes both the synchronization check function and the energizing
function to allow closing when one side of the breaker is dead.
The participation of ASGCSYN in matching of voltage and frequency conditions for
the network breaker synchronization is described via one of the typical application
example as shown in Figure
Source
2
ASGCSYN
(SCB2)
ASCGAPC
ASNSCSYN
(NSCB1)
ASCGAPC
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Figure 764: ASGCSYN participation in matching of V, F during network breaker
synchronization
764.
Source
1
ASGCSYN
(SCB1)
ASCGAPC
Bus1
Start
Matching
ASNSCSYN
∆U, ∆F
(NSCB2)
ASCGAPC
1MRS759142 C
(Equation 330)
ASNSCSYN
(NSCB3)
ASCGAPC
Bus2
Synchronize
REX640
Technical Manual