GE Multilin T60 Transformer Protection System 2-13
2 PRODUCT DESCRIPTION 2.2 SPECIFICATIONS
2
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
2
t) and mea-
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
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
Time accuracy: ±3% or ±42 ms, whichever is greater
Operate time: <42 ms at 1.10 × pickup at 60 Hz
BREAKER RESTRIKE
Principle: detection of high-frequency overcurrent
condition ¼ cycle after breaker opens
Availability: one per CT/VT module (not including 8Z
modules)
Pickup level: 0.1 to 2.00 pu in steps of 0.01
Reset delay: 0.000 to 65.535 s in steps of 0.001
SYNCHROCHECK
Max voltage difference: 0 to 400000 V in steps of 1
Max angle difference: 0 to 100
° in steps of 1
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)
PILOT-AIDED SCHEMES
Permissive Overreaching Transfer Trip (POTT)
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
Timing accuracy: ±3% or 4 ms, whichever is greater
LOAD ENCROACHMENT
Responds to: Positive-sequence quantities
Minimum voltage: 0.000 to 3.000 pu in steps of 0.001
Reach (sec. Ω): 0.02 to 250.00 Ω in steps of 0.01
Impedance accuracy: ±5%
Angle: 5 to 50° in steps of 1
Angle accuracy: ±2°
Pickup delay: 0 to 65.535 s in steps of 0.001
Reset delay: 0 to 65.535 s in steps of 0.001
Time accuracy: ±3% or ±4 ms, whichever is greater
Operate time: < 30 ms at 60 Hz
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
Timing accuracy (cold curve): ±100 ms or 2%, whichever is
greater
Timing accuracy (hot curve): ±500 ms or 2%, whichever is greater
for I
p
< 0.9 × k × I
b
and I / (k × I
b
) > 1.1
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
Time accuracy: ±3% or 10 ms, whichever is greater
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