GE Multilin L60, Инструкция по эксплуатации

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GE Multilin L60 Line Phase Comparison System 5-151
5 SETTINGS 5.5 GROUPED ELEMENTS
5
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.
For this function to operate correctly, the phase VT bank should be properly configured and assigned on source 3 or
source 4. The
I _2 × Z – V _2 function cannot be enabled if a phase VT is not assigned at source 3 or 4. In this case this
setting is forced to “Disabled”.
• 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

PRODUCT SETUP

FAULT REPORTS

FAULT REPORT
. This setting controls the percent-
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
the function setting or blocked temporarily using this block setting. Indicate a FlexLogic operand to block the negative-
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.
Figure 5–54: NEGATIVE-SEQUENCE VOLTAGE FAULT DETECTOR LOGIC
MESSAGE
NEG SEQ VOL FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
MESSAGE
NEG SEQ VOL FD
EVENTS: Disabled
Range: Disabled, Enabled
FAST MEASUREMENTS
F1 PHASE CT BANK:
Neg-seq current, I_2
SETTINGS
NEG SEQ VOL
FD IMPEDANCE:
L1 PHASE CT BANK:
Neg-seq current, I_2
| I_2*Z - V_2 |
(summed
current)
L5 PHASE VT BANK:
Neg-seq voltage, V_2
FAULT REPORT
1 Z1 MAG:
FAULT REPORT
1 Z1 ANGLE:
SETTINGS
NEG SEQ VOL
FDL PICKUP:
> FDL PICKUP
NEG SEQ VOL
FDH PICKUP
> FDH PICKUP
87PC V2 FDL OP
FLEXLOGIC OPERAND
87PC V2 FDH OP
Hardwired to the
87PC function
RUN
AN
D
Enabled = 1
Off = 0
SETTINGS
NEG SEQ VOL
FD FUNCTION:
NEG SEQ VOL
FD BLK:
Σ
831799A2.CDR