Siemens 7SJ85 - Overcurrent Protection, 1-Phase (Fast Stage)

Overcurrent Protection, 1-Phase (Fast Stage)
Setting Values
Threshold value 1 A @ 50 and 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Dropout ratio (fixed) 0.90 to 0.99 Increments of 0.01
Time delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for overcurrent and of 105 % for undercur-
rent functionality.
Minimum absolute dropout differential
Protection-class current transformer 15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer 0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Times
Operate time with time delay = 0 ms
Approx. 8 ms + OOT
88
Dropout time Approx. 25 ms + OOT
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1 According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz
Active
Tolerances
Pickup tolerance, current
5 % of the setting value or 10 mA (I
rated
= 1 A)
or 50 mA (I
rated
= 5 A)
Time delays 1 % of the setting value or 10 ms
12.15
88
OOT (Output Operating Time): additional time delay of the output medium used, for example, 5 ms with fast relay
Technical Data
12.15 Overcurrent Protection, 1-Phase (Fast Stage)
SIPROTEC 5, Overcurrent Protection, Manual 1471
C53000-G5040-C017-8, Edition 07.2017