CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
31
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
Inverse, IEC (BS) A, IEC (BS) B, IEC (BS) C, IEC Short Inverse, IAC
Inverse, IAC Short Inverse, IAC Very Inverse, IAC Extremely
Inverse, I
2
t, FlexCurves™ (programmable), definite time (0.01
second base curve)
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)
