GE UR series Instruction Manual page 248

5.5 GROUPED ELEMENTS
The element responds to the magnitude of the I_2 × Z – V_2 voltage term in the signal source associated with the 87PC
function. The impedance factor is controlled by an independent setting. Two voltage thresholds are provided for the low-set
and high-set operation controlling keying and tripping, respectively.
• NEG SEQ VOL FD FUNCTION: This setting enables or disables the negative-sequence voltage fault detection. Note
that all fault detectors operate in parallel toward the 87PC function. If not required, a given fault detector shall be dis-
abled. To effectively disable the overcurrent fault detectors under the main 87PC menu, set their threshold very high.
This function requires voltages to operate, and uses the first voltage bank configured in the relay.
• NEG SEQ VOL FD IMPEDANCE: This setting defines the relative magnitude of the I_2 × Z term augmented to the
negative-sequence voltage. The element uses the positive-sequence line impedance – both magnitude and angle – as
defined under
SETTINGS
age of the line impedance used in the I_2 × Z – V_2 voltage term.
• NEG SEQ VOL FDL PICKUP: This setting controls pickup of the low-set stage used to control the key operation. The
nominal phase-to-ground voltage of the VT bank of the relay is 1 pu. For example, for a phase VT bank configured in
wye and having 63.5 V nominal secondary, or for a phase VT bank configured in delta and having 110 V nominal sec-
ondary, 1 pu is equivalent to 63.5 V.
• NEG SEQ VOL FDH PICKUP: This setting controls pickup of the high-set stage used to control the trip operation. The
nominal phase-to-ground voltage of the VT bank of the relay is 1 pu.
• NEG SEQ VOL FD BLK: The fault detector is hard-wired to the 87PC scheme. It can be disabled permanently using
5
the function setting or blocked temporarily using this block setting. Indicate a FlexLogic™ operand to block the nega-
tive-sequence voltage fault detector upon assertion.
• NEG SEQ VOL FD TARGET: This setting controls the targets of the function. These targets operate independently
from the 87PC targets.
• NEG SEQ VOL FD EVENTS: This setting controls event recording of the function. These events are logged indepen-
dently from the 87PC events.
SETTINGS
NEG SEQ VOL
FD FUNCTION:
Enabled = 1
NEG SEQ VOL
FD BLK:
Off = 0
FAST MEASUREMENTS
F1 PHASE CT BANK:
Neg-seq current, I_2
L5 PHASE VT BANK:
Neg-seq voltage, V_2
L1 PHASE CT BANK:
Neg-seq current, I_2
Figure 5–47: NEGATIVE-SEQUENCE VOLTAGE FAULT DETECTOR LOGIC
5-116
NEG SEQ VOL FD
MESSAGE
TARGET: Self-reset
NEG SEQ VOL FD
MESSAGE
EVENTS: Disabled
PRODUCT SETUP
SETTINGS
NEG SEQ VOL
FD IMPEDANCE:
FAULT REPORT
1 Z1 MAG:
FAULT REPORT
1 Z1 ANGLE:
| I_2*Z - V_2 |
Σ
(summed
current)
L60 Line Phase Comparison System
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
FAULT REPORTS FAULT REPORT
SETTINGS
NEG SEQ VOL
FDL PICKUP:
NEG SEQ VOL
FDH PICKUP
RUN
FLEXLOGIC OPERAND
> FDL PICKUP
87PC V2 FDL OP
> FDH PICKUP
87PC V2 FDH OP
5 SETTINGS
. This setting controls the percent-
Hardwired to the
87PC function
831799A2.CDR
GE Multilin