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5 SETTINGS
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Up to three identical voltage differential elements, one per each VT bank configured in hardware, are provided.
The element responds to a differential signal between magnitudes of the bus and tap voltages. The latter is scaled using a
matching factor to account for the position of the tap. An automatic setting procedure is available under the
menu to calculate automatically the matching factor when installing the relay or after repairs of the bank.
Figure 5–72: VOLTAGE DIFFERENTIAL BASIC CONNECTIONS
The function works with grounded and ungrounded banks. In the latter case, the neutral point voltage must be measured by
the relay. For additional information, refer to the Theory of Operation and Application of Settings chapters.
The following settings are available for each voltage differential element.
GE Multilin
VOLTAGE DIF 1 STG 3
PKP DELAY:
1.00 s
VOLTAGE DIF 1 STG 4
PKP DELAY:
0.20 s
VOLTAGE DIF 1
DPO DELAY: 0.25 s
VOLT DIF 1 BLK STG1:
Off
VOLT DIF 1 BLK STG 2:
Off
VOLT DIF 1 BLK STG 3:
Off
VOLT DIF 1 BLK STG 4:
Off
VOLT DIF 1 TARGET:
Self-Reset
VOLT DIF 1 EVENTS:
Disabled
C70 Capacitor Bank Protection and Control System
5.6 GROUPED ELEMENTS
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
C70 CAPACITOR BANK RELAY
Phase
BUS
VT bank
SOURCE
87V
Phase
TAP
SOURCE
VT bank
Aux VT
For ungrounded
banks only
834738A1.CDR
5
COMMAND
5-151
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