GE 745 Instruction Manual page 28

SPECIFICATIONS
2–8
Time delay:........................................................0.00 to 600.00 s in steps of 0.01
Signal source:...................................................winding 1 phase A current / voltage
Level accuracy: ...............................................±0.02 Hz
Solid state output operate time: 39 to 60 ms at 3% beyond pickup (delay set at 0.0 s)
Relay outputs 2 to 5 operate time: 42 to 66 ms at 3% beyond pickup (delay set at 0.0 s)
FREQUENCY RATE OF CHANGE
Number of elements:....................................4
Operating current pickup: 0.05 to 1.00 × CT in steps of 0.01
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level:.......................................................45.00 to 59.99 Hz in steps of 0.01
Dropout level: ...................................................pickup + 0.03 Hz
Rate 1/2/3/4: ....................................................0.1 to 5.0 Hz/sec. in steps of 0.1
Dropout level: ...................................................pickup + 0.07 Hz/sec.
Signal source:...................................................winding 1 phase A current / voltage
Level accuracy: ...............................................±0.02 Hz
Operate time: ...................................................The operate time of this element is variable and is
OVERFREQUENCY
Operating current pickup: 0.05 to 1.00 × CT in steps of 0.01
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level:.......................................................50.01 to 65.00 Hz in steps of 0.01
Dropout level: ...................................................pickup – 0.03 Hz
Time delay:........................................................0.00 to 600.00 s in steps of 0.01
Signal source:...................................................winding 1 phase A current / voltage
Level accuracy: ...............................................±0.02 Hz
Solid state output operate time: 39 to 60 ms at 3% beyond pickup (delay set at 0.0 s)
Relay outputs 2 to 5 operate time: 42 to 66 ms at 3% beyond pickup (delay set at 0.0 s)
OVEREXCITATION ON VOLTS PER HERTZ
Number of elements:....................................2
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level:.......................................................1.00 to 4.00 V/Hz in steps of 0.01
Curve shapes: ..................................................definite time (0.1 second base curve); IEC curve A/B/C
Time delay:........................................................0.00 to 600.00 s in steps of 0.01
Reset delay:.......................................................0.0 to 6000.0 s in steps of 0.1
Signal source:...................................................voltage
Range:..................................................................10 to 65 Hz
Level accuracy: .....................................±0.02 V/Hz
Solid state output operate time: 165 to 195 ms at 1.10 × pickup:
Relay outputs 2 to 5 operate time: 170 to 200 ms (delay set at 0.0 s) at 1.10 × pickup
OVEREXCITATION ON FIFTH HARMONIC LEVEL
Operating current pickup: 0.03 to 1.00 × CT in steps of 0.01
Pickup level:.......................................................0.1 to 99.9 in steps of 0.1%
Dropout:..............................................................95% of pickup
Time delay:........................................................0 to 60000 s in steps of 1 s
Signal source:...................................................all phase currents
Solid state output operate time: 20 to 120 ms at 1.10 × pickup
Relay outputs 2 to 5 operate time: 25 to 125 ms (delay set at 0.0 s) at 1.10 × pickup
dependent on the decay rate setting and the supervision
frequency level.
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: OVERVIEW