GE b30, Instruction Manual, Page: 35 / 632

CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONS
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 2-21
2
Operate time: <16 ms at 3
×
pickup at 60 Hz (Phase/Ground IOC)
<20 ms at 3 × pickup at 60 Hz (Neutral IOC)
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
PHASE DIRECTIONAL OVERCURRENT
Relay connection: 90
°
(quadrature)
Quadrature voltage: ABC phase seq.: phase A (V
BC
), phase B (V
CA
), phase C (V
AB
); ACB phase seq.: phase A (V
CB
), phase
B (V
AC
), phase C (V
BA
)
Polarizing voltage threshold: 0.004 to 3.000 pu in steps of 0.001
Current sensitivity threshold: 0.05 pu
Characteristic angle: 0 to 359
°
in steps of 1
Angle accuracy: ±2°
Operation time (FlexLogic operands):
Tripping (reverse load, forward fault): <12 ms, typically
Blocking (forward load, reverse fault): <8 ms, typically
PHASE 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
Curve shapes: GE IAV Inverse;
Definite Time (0.1 s base curve)
Curve multiplier: Time dial = 0.00 to 600.00 in steps of 0.01
Curve timing accuracy at <0.90 x pickup:
±3.5% of operate time or ±1/2 cycle (whichever is greater) from pickup to operate
Operate time: <30 ms at 0.9 pickup at 60 Hz for Definite Time mode
PHASE OVERVOLTAGE
Voltage: Phasor only
Pickup level: 0.004 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 in steps of 0.01 s
Operate time: <30 ms at 1.10 × pickup at 60 Hz
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
NEUTRAL OVERVOLTAGE
Pickup level: 0.004 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
Curve timing accuracy at >1.1 pickup: ±3.5% of operate time or ±1 cycle (whichever is greater) from pickup to operate
Operate time:
<30 ms at 1.10 pickup at 60 Hz
AUXILIARY OVERVOLTAGE
Pickup level: 0.004 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
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
Operate time: <30 ms at 1.10
×
pickup at 60 Hz
BREAKER FAILURE
Mode: 1-pole, 3-pole
Current supervision: phase, neutral current