User-Programmable Elements - GE L90 Instruction Manual

2 PRODUCT DESCRIPTION
BREAKER ARCING CURRENT
Principle: accumulates breaker duty (I
sures fault duration
Initiation: programmable per phase from any Flex-
Logic™ operand
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold: 0 to 50000 kA2-cycle in steps of 1
Fault duration accuracy: 0.25 of a power cycle
Availability: 1 per CT bank with a minimum of 2
BREAKER FLASHOVER
Operating quantity: phase current, voltage and voltage differ-
ence
Pickup level voltage: 0 to 1.500 pu in steps of 0.001
Dropout level voltage: 97 to 98% of pickup
Pickup level current: 0 to 1.500 pu in steps of 0.001
Dropout level current: 97 to 98% of pickup
Level accuracy: ±0.5% or ±0.1% of rated, whichever is
greater
Pickup delay: 0 to 65.535 s in steps of 0.001
Time accuracy: ±3% or ±42 ms, whichever is greater
<42 ms at 1.10 × pickup at 60 Hz
Operate time:
SYNCHROCHECK
Max voltage difference: 0 to 100000 V in steps of 1
Max angle difference: 0 to 100
Max freq. difference: 0.00 to 2.00 Hz in steps of 0.01
Hysteresis for max. freq. diff.: 0.00 to 0.10 Hz in steps of 0.01
Dead source function: None, LV1 & DV2, DV1 & LV2, DV1 or
DV2, DV1 xor DV2, DV1 & DV2
(L = Live, D = Dead)
AUTORECLOSURE
Two breakers applications
Single- and three-pole tripping schemes
Up to 4 reclose attempts before lockout
Selectable reclosing mode and breaker sequence
FLEXLOGIC™
Programming language: Reverse Polish Notation with graphical
visualization (keypad programmable)
Lines of code: 512
Internal variables: 64
Supported operations: NOT, XOR, OR (2 to 16 inputs), AND (2
to 16 inputs), NOR (2 to 16 inputs),
NAND (2 to 16 inputs), Latch (Reset
dominant), Edge Detectors, Timers
Inputs: any logical variable, contact, or virtual
input
Number of timers: 32
Pickup delay: 0 to 60000 (ms, sec., min.) in steps of 1
Dropout delay: 0 to 60000 (ms, sec., min.) in steps of 1
GE Multilin
2
t) and mea-
°
in steps of 1
L90 Line Differential Relay
PILOT-AIDED SCHEMES
Permissive Overreaching Transfer Trip (POTT)
POWER SWING DETECT
Functions: Power swing block, Out-of-step trip
Characteristic: Mho or Quad
Measured impedance: Positive-sequence
Blocking / tripping modes: 2-step or 3-step
Tripping mode: Early or Delayed
Current supervision:
Pickup level: 0.050 to 30.000 pu in steps of 0.001
Dropout level: 97 to 98% of Pickup
Fwd / reverse reach (sec. Ω): 0.10 to 500.00 Ω in steps of 0.01
Left and right blinders (sec. Ω): 0.10 to 500.00 Ω in steps of 0.01
Impedance accuracy: ±5%
Fwd / reverse angle impedances: 40 to 90° in steps of 1
Angle accuracy: ±2°
Characteristic limit angles: 40 to 140° in steps of 1
Timers: 0.000 to 65.535 s in steps of 0.001
Timing accuracy: ±3% or 4 ms, whichever is greater
LOAD ENCROACHMENT
Responds to: Positive-sequence quantities
Minimum voltage: 0.000 to 3.000 pu in steps of 0.001
Reach (sec. Ω): 0.02 to 250.00 Ω in steps of 0.01
Impedance accuracy: ±5%
Angle: 5 to 50° in steps of 1
Angle accuracy: ±2°
Pickup delay: 0 to 65.535 s in steps of 0.001
Reset delay: 0 to 65.535 s in steps of 0.001
Time accuracy: ±3% or ±4 ms, whichever is greater
Operate time: < 30 ms at 60 Hz
OPEN POLE DETECTOR
Detects an open pole condition, monitoring breaker auxiliary con-
tacts, the current in each phase and optional voltages on the line
Current pickup level: 0.000 to 30.000 pu in steps of 0.001
Current dropout level: Pickup + 3%, not less than 0.05 pu

2.4.2 USER-PROGRAMMABLE ELEMENTS

FLEXCURVES™
Number: 4 (A through D)
Reset points: 40 (0 through 1 of pickup)
Operate points: 80 (1 through 20 of pickup)
Time delay: 0 to 65535 ms in steps of 1
FLEX STATES
Number: up to 256 logical variables grouped
under 16 Modbus addresses
Programmability: any logical variable, contact, or virtual
input
2.4 SPECIFICATIONS
2
2-15