GE G60 Instruction Manual page 238

5.6 CONTROL ELEMENTS
NOTES ON THE SYNCHROCHECK FUNCTION:
1. The selected sources for synchrocheck inputs V1 and V2 (which must not be the same source) may include both a
three-phase and an auxiliary voltage. The relay will automatically select the specific voltages to be used by the synch-
rocheck element in accordance with the following table.
NO. V1 OR V2
(SOURCE Y)
1 Phase VTs and
Auxiliary VT
2 Phase VTs and
Auxiliary VT
3 Phase VT
4 Phase VT and
Auxiliary VT
5 Auxiliary VT
The voltages V1 and V2 will be matched automatically so that the corresponding voltages from the two sources will be
used to measure conditions. A phase to phase voltage will be used if available in both sources; if one or both of the
Sources have only an auxiliary voltage, this voltage will be used. For example, if an auxiliary voltage is programmed to
VAG, the synchrocheck element will automatically select VAG from the other source. If the comparison is required on a
specific voltage, the user can externally connect that specific voltage to auxiliary voltage terminals and then use this
"Auxiliary Voltage" to check the synchronism conditions.
5
If using a single CT/VT module with both phase voltages and an auxiliary voltage, ensure that only the auxiliary voltage
is programmed in one of the sources to be used for synchrocheck.
Exception: Synchronism cannot be checked between Delta connected phase VTs and a Wye con-
nected auxiliary voltage.
NOTE
2. The relay measures frequency and Volts/Hz from an input on a given source with priorities as established by the con-
figuration of input channels to the source. The relay will use the phase channel of a three-phase set of voltages if pro-
grammed as part of that source. The relay will use the auxiliary voltage channel only if that channel is programmed as
part of the Source and a three-phase set is not.
5-156
V2 OR V1 AUTO-SELECTED
(SOURCE Z) COMBINATION
SOURCE Y
Phase VTs and Phase
Auxiliary VT
Phase VT Phase
Phase VT Phase
Auxiliary VT Phase
Auxiliary VT Auxiliary
G60 Generator Management Relay
AUTO-SELECTED VOLTAGE
SOURCE Z
Phase VAB
Phase VAB
Phase VAB
Auxiliary V auxiliary
(as set for Source z)
Auxiliary V auxiliary
(as set for selected sources)
5 SETTINGS
GE Multilin