ABB RET670 Applications Manual page 601

1MRK504116-UUS C
Application manual
This configuration setting is used to define type of voltage selection. Type of voltage
selection can be selected as:
• no voltage selection
• single circuit breaker with double bus
• breaker-and-a-half arrangement with the breaker connected to busbar 1
• breaker-and-a-half arrangement with the breaker connected to busbar 2
• breaker-and-a-half arrangement with the breaker connected to line 1 and 2 (tie
breaker)
VBaseBus and VBaseLine
These are the configuration settings for the base voltages.
VRatio
The VRatio is defined as VRatio = bus voltage/line voltage. This setting scales up the
line voltage to an equal level with the bus voltage.
PhaseShift
This setting is used to compensate the phase shift between the measured bus voltage
and line voltage when:
• a. different phase-neutral voltages are selected (for example UL1 for bus and UL2
for line);
• b. 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.
VHighBusSynch and VHighLineSynch
The voltage level settings shall be chosen in relation to the bus/line network voltage.
The threshold voltages VHighBusSynch and VHighLineSynch have to be set smaller
than the value where the network is expected to be synchronized. A typical value is
80% of the rated voltage.
VDiffSynch
Section 3
IED application
595