CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
35
PHASE 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:........................................................<16 ms at 3 × pickup at 60 Hz
Timing accuracy for operation at 1.5 ×
pickup: ................................................................±3% or ±4 ms (whichever is greater)
PHASE OVERVOLTAGE
Voltage:....................................................................phasor only
Pickup level:...........................................................0.000 to 3.000 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
Operate time:........................................................<3 cycles at 1.10 × pickup
Timing accuracy: ................................................±3% or ±4 ms (whichever is greater)
PHASE SELECTOR
Function: .................................................................determines the fault type for the trip output scheme, fault
locator, and fault report
PHASE 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
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)
Timing accuracy at 1.03 to 20 × pickup:..±3.5% of operating time or ±1 cycle (whichever is greater)
PHASE UNDERVOLTAGE
Pickup level:...........................................................0.000 to 1.100 pu in steps of 0.001
Dropout level:........................................................>102% of pickup
Level accuracy:....................................................±0.5% of reading from 10 to 208 V
Curve shapes:.......................................................GE IAV Inverse; Definite Time (0.1 second base curve)
Curve multiplier: ..................................................0.00 to 600.00 in steps of 0.01
Timing accuracy for operation at <0.90
× pickup:.............................................................±3.5% of operate time or ±4 ms (whichever is greater)
PILOT-AIDED SCHEMES
Available schemes: ............................................Direct Underreaching Transfer Trip (DUTT) Permissive
Underreaching Transfer Trip (PUTT), Permissive Overreaching
Transfer Trip (POTT), Hybrid POTT, Directional Comparison
Blocking, Directional Comparison Unblocking
