L90 Power System - GE L90 Instruction Manual
Ur series line current differential system
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Also See for L90:
- Instruction manual (900 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (470 pages)
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5 SETTINGS
PATH: SETTINGS
SYSTEM SETUP
87L POWER SYSTEM
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Any changes to the L90 power system settings will change the protection system configuration. As such, the 87L
protection at all L90 protection system terminals must be temporarily disabled to allow the relays to acknowledge
the new settings.
NOTE
•
NUMBER OF TERMINALS: This setting is the number of the terminals of the associated protected line.
•
NUMBER OF CHANNELS: This setting should correspond to the type of communications module installed. If the relay
is applied on two terminal lines with a single communications channel, this setting should be selected as "1". For a two
terminal line with a second redundant channel for increased dependability, or for three terminal line applications, this
setting should be selected as "2".
•
CHARGING CURRENT COMPENSATION: This setting enables and disables the charging current calculations and
corrections of current phasors. The voltage signals used for charging current compensation are taken from the source
assigned with the
CURRENT DIFF SIGNAL SOURCE 1
assigned to this source. The following diagram shows possible configurations.
GE Multilin
87L POWER SYSTEM
NUMBER OF TERMINALS:
2
NUMBER OF CHANNELS:
1
CHARGING CURRENT
COMPENSATN: Disabled
POS SEQ CAPACITIVE
REACTANCE:
0.100 k
ZERO SEQ CAPACITIVE
REACTANCE:
0.100 k
ZERO SEQ CURRENT
REMOVAL: Disabled
LOCAL RELAY ID
NUMBER: 0
TERMINAL 1 RELAY ID
NUMBER: 0
TERMINAL 2 RELAY ID
NUMBER: 0
CHNL ASYM COMP:
Off
BLOCK GPS TIME REF:
Off
MAX CHNL ASYMMETRY:
1.5 ms
ROUND TRIP TIME
CHANGE: 1.5 ms
setting. As such, it's critical to ensure that three-phase line voltage is
L90 Line Current Differential System
5.4 SYSTEM SETUP
5.4.4 L90 POWER SYSTEM
Range: 2, 3
Range: 1, 2
Range: Disabled, Enabled
Range: 0.100 to 65.535 k in steps of 0.001
Range: 0.100 to 65.535 k in steps of 0.001
Range: Disabled, Enabled
Range: 0 to 255 in steps of 1
Range: 0 to 255 in steps of 1
Range: 0 to 255 in steps of 1
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: 0.0 to 10.0 ms in steps of 0.1
Range: 0.0 to 10.0 ms in steps of 0.1
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