Frequency Protection (81 Over-Frequency And Under-Frequency) - Siemens SIPROTEC 7SJ62 Instruction Manual

Technical Data

10.13 Frequency Protection (81 Over-Frequency and Under-Frequency)

Setting Ranges/
Resolutions
Inherent Operating
Times
Dropout Frequency
Dropout Voltage
Tolerances
Influencing Vari-
ables
10-32
Number of Frequency Elements
Pickup Frequency
Time Delay
Undervoltage Blocking
(V positive sequence voltage)
1
The set times are pure delay times.
Pickup Times 81/O or 81/U
Dropout Times 81/O or 81/U
∆f = | Pickup Value – Dropout Value |
Dropout Ratio for
Undervoltage Blocking(V / V
– Pickup Frequencies 81/O or 81U
– Undervoltage Blocking
– Time Delays 81/O or 81/U
Power supply DC voltage (V
0.8 ≤ V ≤ 1.15
/ V
PS PS nominal
Temperature in range
23º F ≤ ϑ ≤ 131º F
amb
Harmonics
rd
- Up to 10% 3 harmonic
th
- Up to 10% 5 harmonic
4: each can be 81/O or 81/U
81–1 to 81–4 45.50 Hz to 54.50 Hz (Increments 0.01 Hz)
@ f = 50 Hz
N
81–1 to 81–4 55.50 Hz to 64.50 Hz(Increments 0.01 Hz)
@ f = 60 Hz
N
81–1 to 81–4 0.00 s to 100.00 s
or ∞ (does not expire)
V 40 V to 120 V
min
approx. 150 ms
approx. 150 ms
approx. 20 mHz
) approx. 1.05
min
15 mHz
3% of set value or 1 V
1% of set value or 10 ms
) in range
DC
0.1%
0.06% /10º F
1%
1%
(Increments 0.01 s)
(Increments 1 V)
7SJ62 Manual
C53000-G1140-C121-1