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4.17
Frequency Protection (ANSI 81)
Setting Ranges / Increments
Number of Frequency Elements
Pickup Frequency f> or f<
Delay Times
T f1
T f2 to T f4
Undervoltage Blocking
(positive sequence component U
The set times are pure delay times.
Times
Pickup times f>, f<
Dropout Times f>, f<
Dropout Difference
Δf = | Pickup Value – Dropout Value |
Dropout Ratio
Dropout ratio
for undervoltage blocking
Tolerances
Frequencies f>, f<
Undervoltage Blocking
Time Delays T(f<, f<)
Influencing Variables
Power supply direct voltage in range 0.8 ≤ U
Temperature in range 23.00 °F (–5 °C) ≤ Θ
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
4; can be set to f> or f<
40 Hz to 66.00 Hz
0.00 s to 600.00 s
0.00 s to 100.00 s
10.0 V to 125.0 V and
)
0 V (no blocking)
1
approx. 100 ms
approx. 100 ms
approx. 20 mHz
approx. 1.05
10 mHz (at U = U
1 % of setting value or 0.5 V
1 % of setting value or 10 ms
/U
≤ 1.15
Aux
AuxN
≤ 131.00 °F (55 °C)
amb
4.17 Frequency Protection (ANSI 81)
Increments 0.01 Hz
Increments 0.01 s
Increments 0.01 s
Increments 0.1V
, f = f
)
N
N
1 %
0.5 %/10 K
1 %
1 %
Technical Data
491
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