Unbalanced-Load Protection
Setting Values
Maximum continuously perm. I2 3.0 % to 30.0 % l2/
l
rated,machine
Increments of 0.1 %
Unbalanced load factor K 1.0 s to 100.0 s Increments of 0.1 s
Warning delay 0.0 s to 60.0 s; ∞ Increments of 0.1 s
Cooling time thermal replica 0 s to 50 000 s Increments of 1 s
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
•
Dropout differential derived from a dropout ratio of 95 %
•
Dropout differential of 3 % of the object rated current
Operate Characteristics
Characteristic of the
thermal replica
Where: t
I2Perm
Permissible application time of the negative-sequence
current
K Unbalanced load factor K
I
2
/I
rated,machine
Unbalanced load (negative-sequence current/rated
current of the machine)
[dwunbaop-300913, 1, en_US]
Figure 12-16 Thermal Characteristic for Unbalanced Load Protection
Times
Pickup time of the warning stage
Approx. 60 ms + OOT
113
at 50 Hz
Approx. 50 ms + OOT at 60 Hz
12.24
113
OOT (Output Operating Time): additional delay of the output medium used, for example, 5 ms with fast relays
Technical Data
12.24 Unbalanced-Load Protection
1498 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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