GE Multilin L60, Инструкция по эксплуатации

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5-154 L60 Line Phase Comparison System GE Multilin
5.5 GROUPED ELEMENTS 5 SETTINGS
5
• POS SEQ di/dt FDL PICKUP : This setting controls pickup of the low set stage of the element used to control the key
operation. Nominal current of the phase CT bank of the relay is 1 pu.
• POS SEQ di/dt FDL SEAL-IN : This setting defines seal-in time of the FDL function. To equalize the response between
all terminals of the line, the timer is started at the rising edge of the raw di / dt condition.
• POS SEQ di/dt FDH PICKUP : This setting controls pickup of the high set stage of the element used to control the trip
operation. Nominal current of the phase CT bank of the relay is 1pu.
• POS SEQ di/dt FDH SEAL-IN : This setting defines seal-in time of the function. To equalize the response between all
terminals of the line, the timer is started at the rising edge of the raw di / dt condition. In this way, the fault detectors
reset approximately at the same time at all line terminals, regardless of responses of individual raw conditions poten-
tially different at different line terminals.
• POS SEQ FDH SUPV : This setting provides seal-in control of the FDH function for the symmetrical external three-
phase faults starting as non-symmetrical defined by the
POS SEQ DI/DT FDH SEAL-IN
setting time. The overreaching dis-
tance function should typically be assigned with this setting.
• POS SEQ di/dt BLK : Note that 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. Select a FlexLogic operand that, if asserted,
should block this fault detector.
• POS SEQ di/dt FD TARGET : This setting controls targets of the function. These targets operate independently from
the 87PC targets.
• POS SEQ di/dt FD EVENTS : This setting controls event recording of the function. These events are logged indepen-
dently from the 87PC events.
Figure 5–56: POSITIVE-SEQUENCE CURRENT RATE OF CHANGE FAULT DETECTOR LOGIC
831801A2.CDR
| I_1 - I_1* |
(summed
current)
FAST MEASUREMENTS
F1 PHASE CT BANK:
Pos-seq current, I_1
L1 PHASE CT BANK:
Pos-seq current, I_1
SETTINGS
POS SEQ di/dt
FDL PICKUP:
POS SEQ di/dt
FDH PICKUP:
> FDL PICKUP
> FDH PICKUP
87PC dI1/dt FDH OP
Hardwired to the
87PC function
RUN
AN
D
Enabled = 1
Off = 0
SETTINGS
POS SEQ di/dt
FD FUNCTION:
POS SEQ di/dt
BLK:
(*) value delayed
by 0.5 cycle
0
t
DPO
TIMERS
POS SEQ di/dt
FDL SEAL-IN:
0
t
DPO
87PC dI1/dt FDL OP
FLEXLOGIC
OPERANDS
POS SEQ di/dt
FDH SEAL-IN:
OR
AN
D
SETTINGS
POS SEQ FDH
SUPV:
Off = 0
Σ