Technical Data
4.2 Definite-Time Overcurrent Protection (ANSI 50, 51, 67)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
465
4.2 Definite-Time Overcurrent Protection (ANSI 50, 51, 67)
Setting Ranges / Increments
Times
Dropout Ratio
Tolerances
Influencing Variables for Pickup Values
Pickup current I>for I
N
= 1 A 0.05 A to 20.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 100.00 A Increments 0.01 A
Pickup current I>> for I
N
= 1 A 0.05 A to 20.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 100.00 A Increments 0.01 A
Delay times T 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
Undervoltage seal-in U< (phase-to-phase) 10.0 V to 125.0 V Increments 0.1 V
Holding Time of Undervoltage Seal-In 0.10 s to 60.00 s Increments 0.01 s
Directional limit line angle tolerance I>> –90° el. to +90° el. Increments 1°
The set times are pure delay times.
Pickup times
I >, I>>
Current = 2 × Pickup Value
Current = 10 × Pickup Value
approx. 35 ms
approx. 25 ms
Dropout times
I >, I>>
approx. 50 ms
Dropout ratio overcurren I> 0.90 to 0.99
Dropout ratio overcurren I>> approx. 0.95 for I/I
N
≥ 0,3 (Increments 0.01)
Dropout ratio undervoltage approx. 1.05
Dropout difference Δϕ 2° elektrical
Pickup current
I >, I>>
for I
N
= 1 A 1 % of setting value or 10 mA
for I
N
= 5 A 1 % of setting value or 50 mA
Undervoltage seal–in U< 1 % of setting value or 0.5 V
Delay times T 1 % or 10 ms
Directional limit lines angle 1° electrical
Power supply direct voltage in range 0.8 ≤ U
Aux
/U
AuxN
≤ 1.15 ≤ 1 %
Temperature in range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) ≤ 0.5 % / 10 K
Frequency in range 0.95 ≤ f/f
N
≤ 1.05 ≤ 1 %
Harmonics
– Up to 10 % 3rd harmonic
– Up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
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