GE D30 Instruction Manual page 254

5.6 CONTROL ELEMENTS
None:
LV1 and DV2:
DV1 and LV2:
DV1 or DV2:
DV1 Xor DV2:
DV1 and DV2:
• SYNCHK1 DEAD V1 MAX VOLT: This setting establishes a maximum voltage magnitude for V1 in 1 'pu'. Below this
5
magnitude, the V1 voltage input used for synchrocheck will be considered "Dead" or de-energized.
• SYNCHK1 DEAD V2 MAX VOLT: This setting establishes a maximum voltage magnitude for V2 in 'pu'. Below this
magnitude, the V2 voltage input used for synchrocheck will be considered "Dead" or de-energized.
• SYNCHK1 LIVE V1 MIN VOLT: This setting establishes a minimum voltage magnitude for V1 in 'pu'. Above this mag-
nitude, the V1 voltage input used for synchrocheck will be considered "Live" or energized.
• SYNCHK1 LIVE V2 MIN VOLT: This setting establishes a minimum voltage magnitude for V2 in 'pu'. Above this mag-
nitude, the V2 voltage input used for synchrocheck will be considered "Live" or energized.
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.
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
Dead Source function is disabled
Live V1 and Dead V2
Dead V1 and Live V2
Dead V1 or Dead V2
Dead V1 exclusive-or Dead V2 (one source is Dead and the other is Live)
Dead V1 and Dead V2
V2 OR V1 AUTO-SELECTED
(SOURCE Z)
SOURCE Y
Phase VTs and Phase
Auxiliary VT
Phase VT Phase
Phase VT Phase
Auxiliary VT Phase
Auxiliary VT Auxiliary
D30 Line Distance Relay
AUTO-SELECTED VOLTAGE
COMBINATION
SOURCE Z
Phase
Phase
Phase
Auxiliary
Auxiliary
(as set for selected sources)
5 SETTINGS
VAB
VAB
VAB
V auxiliary
(as set for Source z)
V auxiliary
GE Multilin