GE D90 Plus Instruction Manual page 41

CHAPTER 2: PRODUCT DESCRIPTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
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)
SPECIFICATIONS
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