ABB REC670 Applications Manual page 303

1MRK 511 401-UEN A
Bay control REC670 2.2 IEC
Application manual
• no voltage selection, No voltage sel.
• single circuit breaker with double bus, Double bus
• 1 1/2 circuit breaker arrangement with the breaker connected to busbar 1, 1 1/2
bus CB
• 1 1/2 circuit breaker arrangement with the breaker connected to busbar 2, 1 1/2
bus alt. CB
• 1 1/2 circuit breaker arrangement with the breaker connected to line 1 and 2,
Tie CB
PhaseShift
This setting is used to compensate the phase shift between the measured bus
voltage and line voltage when:
• different phase-neutral voltages are selected (for example UL1 for bus and
UL2 for line);
• one available voltage is phase-phase and the other one is phase-neutral (for
example UL1L2 for bus and UL1 for line).
The set value is added to the measured line phase angle. The bus voltage is
reference voltage.
Synchronizing settings
OperationSynch
The setting Off disables the Synchronizing function. With the setting On, the
function is in the service mode and the output signal depends on the input
conditions.
UHighBusSynch and UHighLineSynch
The voltage level settings shall be chosen in relation to the bus/line network
voltage. The threshold voltages UHighBusSynch and UHighLineSynch have to be
set lower than the value where the network is expected to be synchronized. A
typical value is 80% of the rated voltage.
UDiffSynch
Setting of the voltage difference between the line voltage and the bus voltage. The
difference is set depending on the network configuration and expected voltages in
the two networks running asynchronously. A normal setting is 0.10-0.15 p.u.
FreqDiffMin
The setting FreqDiffMin is the minimum frequency difference where the systems
are defined to be asynchronous. For frequency differences lower than this value,
the systems are considered to be in parallel. A typical value for FreqDiffMin is 10
mHz. Generally, the value should be low if both synchronizing and synchrocheck
functions are provided, and it is better to let the synchronizing function close, as it
Section 14
Control
297