GE T60 Instruction Manual page 53

2 PRODUCT DESCRIPTION
UNDERFREQUENCY
Minimum signal: 0.10 to 1.25 pu in steps of 0.01
Pickup level: 20.00 to 65.00 Hz in steps of 0.01
Dropout level: pickup + 0.03 Hz
Level accuracy: ±0.001 Hz
Time delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
Operate time: typically 4 cycles at 0.1 Hz/s change
typically 3.5 cycles at 0.3 Hz/s change
typically 3 cycles at 0.5 Hz/s change
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
OVERFREQUENCY
Pickup level: 20.00 to 65.00 Hz in steps of 0.01
Dropout level: pickup – 0.03 Hz
Level accuracy: ±0.001 Hz
Time delay: 0 to 65.535 s in steps of 0.001
Timer accuracy: ±3% of operate time or ±1/4 cycle
(whichever is greater)
Operate time: typically 4 cycles at 0.1 Hz/s change
typically 3.5 cycles at 0.3 Hz/s change
typically 3 cycles at 0.5 Hz/s change
Typical times are average operate times including variables such
as frequency change instance, test method, etc., and may vary by
±0.5 cycles.
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
BREAKER ARCING CURRENT
Principle: accumulates breaker duty (I
sures fault duration
Initiation: programmable per phase from any Flex-
Logic operand
Compensation for auxiliary relays: 0 to 65.535 s in steps of 0.001
Alarm threshold: 0 to 50000 kA2-cycle in steps of 1
Fault duration accuracy: 0.25 of a power cycle
Availability: 1 per CT bank with a minimum of 2
GE Multilin
BREAKER FLASHOVER
Operating quantity:
Pickup level voltage:
Dropout level voltage:
Pickup level current:
Dropout level current:
Level accuracy:
Pickup delay:
Timer accuracy:
Operate time:
BREAKER RESTRIKE
Principle:
Availability:
Pickup level:
Reset delay:
SYNCHROCHECK
Max voltage difference: 0 to 400000 V in steps of 1
Max angle difference:
Max freq. difference:
Hysteresis for max. freq. diff.: 0.00 to 0.10 Hz in steps of 0.01
Dead source function:
PILOT-AIDED SCHEMES
Permissive Overreaching Transfer Trip (POTT)
POWER SWING DETECT
Functions:
Characteristic:
Measured impedance:
Blocking / tripping modes: 2-step or 3-step
Tripping mode:
2 Current supervision:
t) and mea-
Pickup level:
Dropout level:
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:
Fwd / reverse angle impedances: 40 to 90° in steps of 1
Angle accuracy:
Characteristic limit angles: 40 to 140° in steps of 1
Timers:
Timer accuracy:
T60 Transformer Protection System
2.2 SPECIFICATIONS
phase current, voltage and voltage differ-
ence
0 to 1.500 pu in steps of 0.001
97 to 98% of pickup
0 to 1.500 pu in steps of 0.001
97 to 98% of pickup
±0.5% or ±0.1% of rated, whichever is
greater
0 to 65.535 s in steps of 0.001
±3% of operate time or ±42 ms, which-
ever is greater
<42 ms at 1.10 × pickup at 60 Hz
detection of high-frequency overcurrent
condition ¼ cycle after breaker opens
one per CT/VT module (not including 8Z
modules)
0.1 to 2.00 pu in steps of 0.01
0.000 to 65.535 s in steps of 0.001
°
0 to 100 in steps of 1
0.00 to 2.00 Hz in steps of 0.01
None, LV1 & DV2, DV1 & LV2, DV1 or
DV2, DV1 xor DV2, DV1 & DV2
(L = Live, D = Dead)
Power swing block, Out-of-step trip
Mho or Quad
Positive-sequence
Early or Delayed
0.050 to 30.000 pu in steps of 0.001
97 to 98% of pickup
±5%
±2°
0.000 to 65.535 s in steps of 0.001
±3% of operate time or ±1/4 cycle
(whichever is greater)
2
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