GE D90 Plus - Page 35

CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 25
OPEN POLE DETECTOR
Functionality: ........................................................detects an open pole condition, monitoring breaker auxiliary
contacts, the current in each phase and optional voltages on
the line
Current pickup level:..........................................0.000 to 30.000 pu in steps of 0.001
Line capacitive reactances: ...........................300.0 to 9999.9 secondary ohms in steps of 0.1
Remote current pickup level:.........................0.000 to 30.000 pu in steps of 0.001
Current dropout level:.......................................pickup + 3%; not less than 0.05 pu
OVERFREQUENCY
Elements: ................................................................2
Pickup level:...........................................................20.00 to 65.00 Hz in steps of 0.01
Dropout level:........................................................pickup level – 0.03 Hz
Level accuracy: ....................................................±0.01 Hz
Time delay:.............................................................0 to 65.535 seconds in steps of 0.001
Timer accuracy:...................................................±3% or 4 ms (whichever is greater)
PHASE DIRECTIONAL OVERCURRENT
Relay connection: ...............................................90° (quadrature)
Quadrature voltage: ..........................................phase A (V
BC
), phase B (V
CA
), phase C (V
AB
) for ABC phase
sequence; phase A (V
CB
), phase B (V
AC
), phase C (V
BA
) for ACB
phase sequence
Polarizing voltage threshold:.........................0.000 to 3.000 pu in steps of 0.001
Current sensitivity threshold:.........................0.05 pu
Characteristic angle:.........................................0 to 359° in steps of 1
Angle accuracy:...................................................±2°
Tripping operation time: ..................................<12 ms, typically (reverse load, forward fault)
Blocking operation time: .................................<8 ms, typically (forward load, reverse fault)
PHASE DISTANCE
Characteristic: ......................................................mho (memory polarized or offset) or quad (memory polarized
or non-directional), selectable individually per zone
Zones:.......................................................................5
Directionality:........................................................forward, reverse, or non-directional per zone
Reach:.......................................................................0.02 to 250.00 ohms in steps of 0.01 (secondary ohms)
Reach accuracy:..................................................±5%, including the effect of CVT transients up to an SIR of 30
for V < 1.1 × V
nominal
Distance characteristic angle:......................30 to 90° in steps of 1
Distance limit angle:..........................................30 to 90° in steps of 1
Directional supervision characteristic
angle:...................................................................30 to 90° in steps of 1
Directional supervision limit angle: ............30 to 90° in steps of 1
Right and left blinder reach: ..........................0.02 to 500.00 ohms in steps of 0.01
Right and left blinder characteristic
angle:...................................................................60 to 90° in steps of 1
Time delay:.............................................................0.000 to 65.535 seconds in steps of 0.001
Timing accuracy: ................................................±3% or 4 ms (whichever is greater)
Current supervision level:................................line-to-line current
Current supervision pickup: ...........................0.050 to 30.000 pu in steps of 0.001
Memory duration: ...............................................5 to 25 cycles in steps of 1
CT location: ............................................................all delta-wye and wye-delta transformers
VT location: ............................................................all delta-wye and wye-delta transformers
Voltage supervision pickup:...........................0.000 to 5.000 pu in steps of 0.001 (series compensation
applications)