GE L60 Instruction Manual page 201

5 SETTINGS
• 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
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.
SETTINGS
POS SEQ di/dt
FD FUNCTION:
Enabled = 1
POS SEQ di/dt
BLK:
Off = 0
FAST MEASUREMENTS
F1 PHASE CT BANK:
Pos-seq current, I_1
L1 PHASE CT BANK:
Pos-seq current, I_1
SETTINGS
POS SEQ FDH
SUPV:
Off = 0
Figure 5–42: POSITIVE-SEQUENCE CURRENT RATE OF CHANGE FAULT DETECTOR LOGIC
g) CHARGE CURRENT COMPENSATION
PATH: SETTINGS GROUPED ELEMENTS
CHARGE CURRENT
COMPENSATION
MESSAGE
MESSAGE
MESSAGE
• CHARGING CURRENT COMPENSATN: This setting enables/disables the charging current calculations and correc-
tions of the mixed current used as an operating quantity for fault detectors and square pulses. The voltage signals
used for charging current compensation are taken from source 3 or 4 assigned with the three-phase voltage bank on
the L5 voltage bank. As such, it's critical to ensure that three-phase line voltage is assigned to this source and voltage
bank settings are entered correctly. Half (or one-third for the three-terminal line, as defined by the
setting) of the line charging current is subtracted from the line current. The following diagram shows possible
SELECT
configurations.
GE Multilin
POS SEQ DI/DT FDH SEAL-IN
SETTINGS
POS SEQ di/dt
FDL PICKUP:
POS SEQ di/dt
FDH PICKUP:
RUN
> FDL PICKUP
| I_1 - I_1* |
(breaker 1)
>FDH PICKUP
> FDL PICKUP
| I_1 - I_1* |
(breaker 2)
> FDH PICKUP
(*) value delayed
by 0.5 cycle
PHASE COMPARISON ELEMENTS
CHARGE CURRENT
COMPENSATN: Disabled
CHARGE COMPENST BLK:
Off
POS SEQ CAPACITIVE
REACTANCE: 0.100 KΩ
ZERO SEQ CAPACITIVE
REACTANCE: 0.100 KΩ
L60 Line Phase Comparison Relay
5.5 GROUPED ELEMENTS
setting time. The overreaching dis-
Hardwired to the
TIMERS
87PC function
POS SEQ di/dt
FDL SEAL-IN:
FLEXLOGIC OPERANDS FLEXLOGIC OPERANDS
0
87PC dI1/dt FDL OP
t
DPO
87PC dI1/dt FDH OP
POS SEQ di/dt
FDH SEAL-IN:
0
t
DPO
831801A1.CDR
CHARGE CURRENT COMPENSATION
Range: Disabled, Enabled
Range: any FlexLogic™ operand
Ω
Range: 0.100 to 65.535 k in steps of 0.001
Ω
Range: 0.100 to 65.535 k in steps of 0.001
5
87PC SCHEME
5-99