Siemens Siprotec 7UM612 - Underexcitation (Loss-Of-Field) Protection (ANSI 40)

4.6 Underexcitation (Loss-of-Field) Protection (ANSI 40)
319
7UM61 Manual
C53000-G1176-C127-3
4.6 Underexcitation (Loss-of-Field) Protection (ANSI 40)
Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables for Pickup Values
Conductance Sections 1/xd Char. 0.25 to 3.00 Increments 0.01
Slope angle α1, α2, α350° to 120° Increments 1°
Delay times T 0.00 to 60.00
or ∞ (ineffective)
Increments 0.01
s
Undervoltage Blocking 10.0 V to 125.0 V Increments 0.1V
Pickup Times
Conductance Sections 1/xd Char. approx. 60 ms
Rotor circuit criterion Uexc approx. 60 ms
Undervoltage Blocking approx. 50 ms
Conductance Sections 1/xd Char., α approx. 0.95
Rotor circuit criterion Uexc approx. 1.05 or pickup value + 0.5 V
Undervoltage Blocking approx. 1.1
Stator criterion 1/xd Char. 3 % of setting value
Stator Criterion α 1° electrical
Undervoltage Blocking 1 % of setting value or 0.5 V
Delay times T 1 % 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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