Technical Data
10-33
7SJ63 Manual
C53000-G1140-C120-1
10.13 Frequency Protection (81 Over-Frequency and Under-Frequency)
Setting Ranges/
Resolutions
Number of Frequency Elements
4: each can be 81/O or 81/U
Pickup Frequency
81–1 to 81–4
45.50 Hz to 54.50 Hz (Increments 0.01 Hz)
@ f
N
= 50 Hz
81–1 to 81–4
55.50 Hz to 64.50 Hz(Increments 0.01 Hz)
@ f
N
= 60 Hz
Time Delay
81–1 to 81–4
0.00 s to 100.00 s
(Increments 0.01 s)
or
∞
(does not expire)
Undervoltage Blocking
V
min
40 V to 120 V
(Increments 1 V)
(V
1
positive sequence voltage)
The set times are pure delay times.
Inherent Operating
Times
Pickup Times 81/O or 81/U
approx. 150 ms
Dropout Times 81/O or 81/U
approx. 150 ms
Dropout Frequency
∆
f = | Pickup Value – Dropout Value |
approx. 20 mHz
Dropout Voltage
Dropout Ratio for
Undervoltage Blocking(V / V
min
)
approx. 1.05
Tolerances
– Pickup Frequencies 81/O or 81U
10 mHz
– Undervoltage Blocking
3% of set value or 1 V
– Time Delays 81/O or 81/U
1% of set value or 10 ms
Influencing Vari-
ables
Power supply DC voltage (V
DC
) in range
0.8
≤
V
PS
/ V
PS nominal
≤
1.15
0.1%
Temperature in range
23º F
≤
ϑ
amb
≤
131º F
0.06% /10º F
Harmonics
- Up to 10% 3
rd
harmonic
1%
- Up to 10% 5
th
harmonic
1%
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