Frequency Protection (Ansi 81) - Siemens Siprotec 7UM62 Manual

4.17

Frequency Protection (ANSI 81)

Setting Ranges/
Resolutions
Inherent Operating
Times
Dropout Frequency
Dropout Voltage
Tolerances
Influencing
Variables
7UM62 Manual
C53000-G1176-C149-3
Number of Frequency Elements
Pickup Frequency
Delay Time
Undervoltage Blocking
(U Positive Sequence Voltage)
1
The set times are pure delay times.
Pickup Times
Dropout Times
∆f = | Pickup Value – Dropout Value |
Dropout Ratio for
Undervoltage Blocking
– Pickup Frequencies
– Undervoltage Blocking
– Delay Times
Power Supply DC Voltage (U
0.8 ≤ U ≤ 1.15
/ U
PS PS nominal
Temperature in Range
23 °F ≤ ϑ ≤ 131 °F
amb
–5 °C ≤ ϑ ≤ 55 °C
amb
Harmonics
– Up to 10 % 3rd Harmonics
– Up to 10 % 5th Harmonics
4.17 Frequency Protection (ANSI 81)
4: each can be 81/O or 81/U
f> or f< 40.00 Hz to 65.00 Hz (Increments 0.01 Hz)
(81–1 to 81–4)
T f1 (81–1) 0.00 s to 600.00 s
T f2 to T f4 0.00 s to 100.00 s
(81–2 to 81–4)
10.0 V to 125.0 V
f>, f< Approx. 100 ms
81/O or 81/U
T (f<, f<) Approx. 100 ms
81/O or 81/U
Approx. 20 mHz
Approx. 1.05
f>, f< 10 mHz (at U = U
81/O or 81U
1 % of set value or 0.5 V
T (f<, f<) 1 % of set value or 10 ms
81/O or 81/U
) in Range
DC
0.1 %
0.3 % / 10 °F
0.5 % / 10 K
< 1 %
< 1 %
(Increments 0.01 s)
(Increments 0.01 s)
(Increments 0.1 V)
; f = f )
N N
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