GE D90 Plus Instruction Manual page 42

SPECIFICATIONS
32
NEUTRAL DIRECTIONAL OVERCURRENT
Directionality:........................................................ co-existing forward and reverse
Polarizing:............................................................... voltage, current, dual
Polarizing voltage:.............................................. V_0 or VX
Polarizing current: .............................................. IG
Operating current:.............................................. I_0
Level sensing: ....................................................... 3 × (|I_0| – K × |I_1|), IG; independent for forward and reverse
Restraint (K): .......................................................... 0.000 to 0.500 in steps of 0.001
Characteristic angle:......................................... –90 to 90° in steps of 1
Limit angle: ............................................................ 40 to 90° in steps of 1, independent for forward and reverse
Angle accuracy:................................................... ±2°
Offset impedance:.............................................. 0.00 to 250.00 ohms in steps of 0.01
Pickup level:........................................................... 0.002 to 30.000 pu in steps of 0.01
Dropout level: ....................................................... <98%
Operation time:.................................................... <16 ms at 3 × pickup at 60 Hz
NEUTRAL INSTANTANEOUS OVERCURRENT
Pickup level:........................................................... 0.000 to 30.000 pu in steps of 0.001
Dropout level: ....................................................... <98% of pickup
Level accuracy at 0.1 to 2.0 × CT: ............... ±0.5% of reading or ±1% of rated (whichever is greater)
Level accuracy at >2.0 × CT:.......................... ±1.5% of reading
Overreach: ............................................................. <2%
Pickup delay:......................................................... 0.00 to 600.00 seconds in steps of 0.01
Reset delay: ........................................................... 0.00 to 600.00 seconds in steps of 0.01
Operate time:........................................................ <20 ms at 3 × pickup at 60 Hz
Timing accuracy for operation at 1.5 ×
pickup: ................................................................ ±3% or ±4 ms (whichever is greater)
NEUTRAL OVERVOLTAGE
Pickup level:........................................................... 0.000 to 1.250 pu in steps of 0.001
Dropout level: ....................................................... <98% of pickup
Level accuracy:.................................................... ±0.5% of reading from 10 to 208 V
Pickup delay:......................................................... 0.00 to 600.00 seconds in steps of 0.01 (definite time) or
Reset delay: ........................................................... 0.00 to 600.00 seconds in steps of 0.01
Timing accuracy: ................................................ ±3% or ±20 ms (whichever is greater)
Operate time:........................................................ <3 cycles at 1.10 × pickup
NEUTRAL TIME OVERCURRENT
Current:.................................................................... phasor or RMS
Pickup level:........................................................... 0.000 to 30.000 pu in steps of 0.001
Dropout level: ....................................................... <98% of pickup
Level accuracy at 0.1 to 2.0 × CT: ............... ±0.5% of reading or ±1% of rated (whichever is greater)
Level accuracy at >2.0 × CT:.......................... ±1.5% of reading
Curve shapes:....................................................... IEEE Moderately Inverse, IEEE Very Inverse, IEEE Extremely
Curve multiplier:.................................................. 0.01 to 600.00 in steps of 0.01
Reset type: ............................................................. instantaneous/timed (per IEEE)
Timing accuracy at 1.03 to 20 × pickup: . ±3.5% of operating time or ±1 cycle (whichever is greater)
NON-VOLATILE LATCHES
Type: ......................................................................... set-dominant or reset-dominant
Number: .................................................................. 16 (individually programmed)
Output:..................................................................... stored in non-volatile memory
Execution sequence:......................................... as input prior to protection, control, and FlexLogic™
user-defined curve
Inverse, IEC (BS) A, IEC (BS) B, IEC (BS) C, IEC Short Inverse, IAC
Inverse, IAC Short Inverse, IAC Very Inverse, IAC Extremely
2
Inverse, I t, FlexCurves™ (programmable), definite time (0.01
second base curve)
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: PRODUCT DESCRIPTION