GE G60 Instruction Manual page 51

2 PRODUCT DESCRIPTION
BREAKER FAILURE
Mode: 1-pole, 3-pole
Current supervision: phase, neutral current
Current supv. pickup: 0.001 to 30.000 pu in steps of 0.001
Current supv. dropout: 97 to 98% of pickup
Current supv. accuracy:
0.1 to 2.0 × CT rating: ±0.75% of reading or ±2% of rated
(whichever is greater)
above 2 × CT rating:
±2.5% of reading
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
BREAKER FLASHOVER
Operating quantity: phase current, voltage and voltage differ-
ence
Pickup level voltage: 0 to 1.500 pu in steps of 0.001
Dropout level voltage: 97 to 98% of pickup
Pickup level current: 0 to 1.500 pu in steps of 0.001
Dropout level current: 97 to 98% of pickup
Level accuracy: ±0.5% or ±0.1% of rated, whichever is
greater
Pickup delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±42 ms, which-
ever is greater
<42 ms at 1.10 × pickup at 60 Hz
Operate time:
SYNCHROCHECK
Max voltage difference: 0 to 400000 V in steps of 1
Max angle difference: 0 to 100
Max freq. difference: 0.00 to 2.00 Hz in steps of 0.01
Hysteresis for max. freq. diff.: 0.00 to 0.10 Hz in steps of 0.01
Dead source function: None, LV1 & DV2, DV1 & LV2, DV1 or
DV2, DV1 xor DV2, DV1 & DV2
(L = Live, D = Dead)
POWER SWING DETECT
Functions: Power swing block, Out-of-step trip
Characteristic: Mho or Quad
Measured impedance: Positive-sequence
Blocking / tripping modes: 2-step or 3-step
Tripping mode: Early or Delayed
Current supervision:
Pickup level: 0.050 to 30.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Fwd / reverse reach (sec. Ω): 0.10 to 500.00 Ω in steps of 0.01
Left and right blinders (sec. Ω): 0.10 to 500.00 Ω in steps of 0.01
Impedance accuracy: ±5%
Fwd / reverse angle impedances: 40 to 90° in steps of 1
Angle accuracy: ±2°
Characteristic limit angles: 40 to 140° in steps of 1
Timers: 0.000 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
GE Multilin
°
in steps of 1
G60 Generator Protection System
ACCIDENTAL ENERGIZATION
Operating condition: Overcurrent
Arming condition: Undervoltage and/or Machine Offline
Overcurrent:
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy: ±0.5% of reading from
0.1 to 2.0 × CT rating
Undervoltage:
Pickup level: 0.000 to 3.000 pu in steps of 0.001
Dropout level: 102 to 103% of pickup
Level accuracy: ±0.5% of reading 10 to 208 V
Operate Time: <30 ms at 1.10 × pickup at 60 Hz
LOSS OF EXCITATION
Operating condition: Positive-sequence impedance
Characteristic: 2 independent offset mho circles
0.10 to 300.0 Ω (sec.) in steps of 0.01
Center:
Radius: 0.10 to 300.0 Ω (sec.) in steps of 0.01
Reach accuracy: ±3%
Undervoltage supervision
Level: 0.000 to 1.250 pu in steps of 0.001
Accuracy: ±0.5% of reading from 10 to 208 V
Pickup delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±20 ms, which-
ever is greater
Operate time: <50 ms
THERMAL OVERLOAD PROTECTION
Thermal overload curves: IEC 255-8 curve
Base current: 0.20 to 3.00 pu in steps of 0.01
Overload (k) factor: 1.00 to 1.20 pu in steps of 0.05
Trip time constant: 0 to 1000 min. in steps of 1
Reset time constant: 0 to 1000 min. in steps of 1
Minimum reset time: 0 to 1000 min. in steps of 1
Timer accuracy (cold curve): ±100 ms or 2%, whichever is greater
Timer accuracy (hot curve): ±500 ms or 2%, whichever is greater
for I < 0.9 × k × I
p
RTD PROTECTION
Pickup: 1 to 249°C in steps of 1
Dropout level: 2°C of pickup
Timer accuracy: <1 s
Elements: trip and alarm
REMOTE RTD PROTECTION
Pickup level: 1 to 200°C
Dropout level: 2°C of pickup
Time delay: <10 s
Elements: trip and alarm
TRIP BUS (TRIP WITHOUT FLEXLOGIC)
Number of elements: 6
Number of inputs: 16
Operate time: <2 ms at 60 Hz
Timer accuracy: ±3% or 10 ms, whichever is greater
2.2 SPECIFICATIONS
2
and I / (k × I ) > 1.1
b b
2-19