GE B90 User Manual

CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONS
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 2-17
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
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
Operate time: <16 ms at 3x pickup at 60 Hz
UNDERVOLTAGE
Pickup level: 0.004 to 3.000 pu in steps of 0.001
Dropout level: 102 to 103% of pickup
Level accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 65.535 s in steps of 0.001
Reset delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
Operate time: <16 ms at <0.9 x pickup at 60 Hz
END FAULT PROTECTION
IOC pickup level: 0.020 to 30.000 pu in steps of 0.001
IOC dropout level: 97 to 98% of pickup
Level accuracy
at 0.1 to 2.0 × CT: 0.5% of reading or 1% of nominal (whichever is greater)
above 2.0 × CT: 1.5% of reading
CB open pickup timer: 0 to 65.535 s in steps of 0.001
End Fault pickup timer: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±8 ms, whichever is greater
BREAKER FAILURE
Mode: 3-pole
Current supervision: phase current
Current supv. pickup: 0.020 to 30.000 pu in steps of 0.001
Current supv. dropout: 97 to 98% of pickup
Current supv. accuracy:
0.1 to 2.0 × CT rating: ±0.75% of reading or ±2% of rated (whichever is greater)
above 2 × CT rating: ±2.5% of reading
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
TRIP BUS (TRIP WITHOUT FLEXLOGIC)
Number of elements: 6
Number of inputs: 16
Operate time: <2 ms at 60 Hz
Timer accuracy: ±3% or 10 ms, whichever is greater
2.5.2 User-programmable elements
FLEXLOGIC
Programming language: Reverse Polish Notation with graphical visualization (keypad programmable)
Lines of code: 1024
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
FLEXCURVES™
Number: 4 (A through D)
Reset points: 40 (0 through 1 of pickup)
Operate points: 80 (1 through 20 of pickup)

GE B90 Specifications

General

Brand	GE
Model	B90
Category	Relays
Language	English