GE D90 Plus Instruction Manual page 41

CHAPTER 2: PRODUCT DESCRIPTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
NEGATIVE-SEQUENCE DIRECTIONAL OVERCURRENT
Directionality:........................................................co-existing forward and reverse
Polarizing: ...............................................................voltage
Polarizing voltage: ..............................................V_2
Operating current:..............................................I_2
Level sensing (zero-sequence):.....................|I_0| – K × |I_1|
Level sensing (negative-sequence): ...........|I_2| – K × |I_1|
Restraint, K: ...........................................................0.000 to 0.500 in steps of 0.001
Characteristic angle: .........................................0 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: ...........................................................0.05 to 30.00 pu in steps of 0.01
Dropout level:........................................................<98%
Operation time:....................................................<16 ms at 3 × pickup at 60 Hz
NEGATIVE-SEQUENCE 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)
NEGATIVE-SEQUENCE 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
Reset delay: ...........................................................0.00 to 600.00 seconds in steps of 0.01
Timing accuracy: ................................................±3% or ±20 ms (whichever is greater)
Operate time:........................................................< 30 ms at 1.10 × pickup at 60 Hz
NEGATIVE-SEQUENCE TIME 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
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) and linear
Timing accuracy for 1.03 to 20 × pickup: ±3.5% of operating time or ±1 cycle (whichever is greater)
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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