Siemens Siprotec 7UM612 - Impedance Protection (ANSI 21)

4 Technical Data
322
7UM61 Manual
C53000-G1176-C127-3
4.9 Impedance Protection (ANSI 21)
Pickup
Impedance Measurement
Times
Influencing Variables for Pickup Values
Pickup current IMP I> for I
N
= 1 A 0.10 A to 20.00 A Increments 0.01 A
for I
N
= 5 A 0.50 A to 100.00 A Increments 0.05 A
Dropout Ratio approx. 0.95 Increments 0.1 %
Measuring Tolerances
acc. to VDE 0435
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< 10.0 V to 125.0 V Increments 0.1 V
Dropout Ratio approx. 1.05
Characteristic Polygonal, 3 independent stages
Impedance Z1 (secondary, Based on I
N
=
1 A)
0,05 Ω up to 130.00 Ω Increments 0.01 Ω
Impedance Z1 (secondary, Based on I
N
=
5 A)
0,01 Ω up to 26.00 Ω
Impedance Z1B (secondary, Based on I
N
= 1 A)
0,05 Ω up to 65.00 Ω Increments 0.01 Ω
Impedance Z1B (secondary, Based on I
N
= 5 A)
0,01 Ω up to 13.00 Ω
Impedance Z2 (secondary, Based on I
N
=
1 A)
0,05 Ω up to 65.00 Ω Increments 0.01 Ω
Impedance Z2 (secondary, Based on
I
N
= 5 A)
0,01 Ω up to 13.00 Ω
Measuring Tolerances as per VDE0435
part 303 with Sinusoidal Quantities
|∆Z/Z| ≤ 5 % for 30° ≤ ϕ
K
≤ 90° or 10 mΩ
Delay Times 0.00 s to 60.00 s Increments 0.01 s
Shortest Tripping Time 35 ms
Typical Tripping Time approx. 40 ms
Dropout Time approx. 50 ms
Holding Time of Undervoltage Seal-In 0.10 s to 60.00 s Increments 0.01 s
Delay Time Tolerances 1 % of setting value or 10 ms
Auxiliary DC voltage in range
0.8 ≤ U
Aux
/U
AuxN
≤ 1.15
≤ 1 %
Temperature in Range
23°F or –5 °C ≤ Θ
amb
≤ 131°F or 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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