GE L90 Instruction Manual page 49

2 PRODUCT DESCRIPTION
NEUTRAL OVERVOLTAGE
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0.00 to 600.00 s in steps of 0.01 (definite
time) or user-defined curve
Reset delay: 0.00 to 600.00 s in steps of 0.01
Timing accuracy: ±3% or ±20 ms (whichever is greater)
30 ms at 1.10  pickup at 60 Hz
Operate time:
AUXILIARY OVERVOLTAGE
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 600.00 s in steps of 0.01
Reset delay: 0 to 600.00 s in steps of 0.01
Timing accuracy: ±3% of operate time or ±4 ms
(whichever is greater)
 30 ms at 1.10  pickup at 60 Hz
Operate time:
UNDERFREQUENCY
Minimum signal: 0.10 to 1.25 pu in steps of 0.01
Pickup level: 20.00 to 65.00 Hz in steps of 0.01
Dropout level: pickup + 0.03 Hz
Level accuracy: ±0.001 Hz
Time delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% or 4 ms, whichever is greater
Operate time: typically 4 cycles at 0.1 Hz/s change
typically 3.5 cycles at 0.3 Hz/s change
typically 3 cycles at 0.5 Hz/s change
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
OVERFREQUENCY
Pickup level: 20.00 to 65.00 Hz in steps of 0.01
Dropout level: pickup – 0.03 Hz
Level accuracy: ±0.001 Hz
Time delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% or 4 ms, whichever is greater
Operate time: typically 4 cycles at 0.1 Hz/s change
typically 3.5 cycles at 0.3 Hz/s change
typically 3 cycles at 0.5 Hz/s change
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
GE Multilin
RATE OF CHANGE OF FREQUENCY
df/dt trend:
df/dt pickup level:
df/dt dropout level:
df/dt level accuracy:
Overvoltage supv.:
Overcurrent supv.:
Pickup delay:
Reset delay:
Time accuracy:
95% settling time for df/dt: < 24 cycles
Operate time:
BREAKER FAILURE
Mode:
Current supervision:
Current supv. pickup:
Current supv. dropout:
Current supv. accuracy:
0.1 to 2.0  CT rating: ±0.75% of reading or ±2% of rated
above 2  CT rating:
BREAKER ARCING CURRENT
Principle:
Initiation:
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold:
Fault duration accuracy: 0.25 of a power cycle
Availability:
BREAKER FLASHOVER
Operating quantity:
Pickup level voltage:
Dropout level voltage:
Pickup level current:
Dropout level current:
Level accuracy:
Pickup delay:
Time accuracy:
Operate time:
BREAKER RESTRIKE
Principle:
Availability:
Pickup level:
Reset delay:
L90 Line Current Differential System
2.4 SPECIFICATIONS
increasing, decreasing, bi-directional
0.10 to 15.00 Hz/s in steps of 0.01
96% of pickup
80 mHz/s or 3.5%, whichever is greater
0.100 to 3.000 pu in steps of 0.001
0.000 to 30.000 pu in steps of 0.001
0 to 65.535 s in steps of 0.001
0 to 65.535 s in steps of 0.001
±3% or ±4 ms, whichever is greater
typically 6.5 cycles at 2  pickup
typically 5.5 cycles at 3  pickup
typically 4.5 cycles at 5  pickup
1-pole, 3-pole
phase, neutral current
0.001 to 30.000 pu in steps of 0.001
97 to 98% of pickup
(whichever is greater)
±2.5% of reading
2
accumulates breaker duty (I t) and mea-
sures fault duration
programmable per phase from any Flex-
Logic operand
0 to 50000 kA2-cycle in steps of 1
1 per CT bank with a minimum of 2
phase current, voltage and voltage differ-
ence
0 to 1.500 pu in steps of 0.001
97 to 98% of pickup
0 to 1.500 pu in steps of 0.001
97 to 98% of pickup
±0.5% or ±0.1% of rated, whichever is
greater
0 to 65.535 s in steps of 0.001
±3% or ±42 ms, whichever is greater
<42 ms at 1.10  pickup at 60 Hz
detection of high-frequency overcurrent
condition ¼ cycle after breaker opens
one per CT/VT module (not including 8Z
modules)
0.1 to 2.00 pu in steps of 0.01
0.000 to 65.535 s in steps of 0.001
2
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