Underexcitation (Loss-Of-Field) Protection (Ansi 40) - Siemens Siprotec 7UM62 Manual

4.10

Underexcitation (Loss-of-Field) Protection (ANSI 40)

Setting Ranges/
Resolutions
Inherent Operating
Times
Dropout
Tolerances
Influencing
Variables for
Pickup
7UM62 Manual
C53000-G1176-C149-3
Conductance Sections
Angle of Inclination
Delay Time
Undervoltage Lock-Out
Excitation Voltage
(via external upstream voltage divider)
Pickup Times
– Stator Criterion
– Rotor Criterion
– Undervoltage Lock-Out U
– Stator Criterion
– Rotor Criterion
– Undervoltage Lock-Out U
– Stator Criterion
– Stator Criterion
– Rotor Criterion
– Undervoltage Lock-Out U
– Delay Times
Power Supply Direct Voltage in Range
0.8 ≤ U
/ U
PS PS nominal
Temperature in Range
23 °F ≤ ϑ ≤ 131 °F
amb
–5 °C ≤ ϑ ≤ 55 °C
amb
Frequency in Range
0.95 ≤ f/f ≤ 1.05
N
Harmonic Currents
– Up to 10 % 3rd Harmonics
– Up to 10 % 5th Harmonics
4.10 Underexcitation (Loss-of-Field) Protection (ANSI 40)
1/xd CHAR. 0.25 to 3.00
α1, α2, α3
50° to 120°
T 0.00 s to 60.00 s
or ∞ (does not expire)
10.0 V to 125.0 V (Increments 0.1 V)
Uexc. < 0.50 V to 8.00 V
1/xd CHAR., α Approx. 60 ms
Uexc. Approx. 60 ms
< Approx. 50 ms
1
1/xd CHAR., α Approx. 0.95
Uexc. Approx. 1.05 or + 0.5 V
< Approx. 1.1
1
1/xd CHAR. 3 % of setting value
α
1° electrical
Uexc. 1° or 0.1 V
< 1 % of setting value or 0.5 V
1
T 1 % of setting value or 10 ms
≤ 1.15
1 %
0.3 % / 10 °F
0.5 % / 10 K
1 %
1 %
1 %
(Increments 0.01)
(Increments 1°)
(Increments 0.01 s)
(Increments 0.01 V)
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