Siemens SIPROTEC 7UM62 - 4.10 Underexcitation (Loss-of-Field) Protection (ANSI 40)

Technical Data
4.10 Underexcitation (Loss-of-Field) Protection (ANSI 40)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
482
4.10 Underexcitation (Loss-of-Field) Protection (ANSI 40)
Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables for Pickup Values
Conductance Sections 1/xd Char. 0.20 to 3.00 Increments 0.01
Slope angle α1, α2, α3 50° to 120° Increments 1°
Delay times T 0.00 s to 60.00 s or ∞ (ineffective) Increments 0.01 s
Undervoltage Blocking 10.0 V to 125.0 V Increments 0.1V
Excitation DC voltage Uexc <
(via external upstream voltage divider)
0.50 V to 8.00 V Increments 0.01V
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
Conductance Sections 1/xd Char. 3 % of setting value
Stator Criterion α 1° electrical
Rotor circuit criterion Uexc 1° or 0.1 V
Undervoltage Blocking 1 % of setting value or 0.5 V
Delay times T 1 % or 10 ms
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 %