Unbalanced Load (Negative Sequence) Protection (Ansi 46) - Siemens Siprotec 7UM611 Manual

4.5

Unbalanced Load (Negative Sequence) Protection (ANSI 46)

Setting Ranges / Increments
Trip Time Characteristics
Times
Dropout Conditions
Tolerances
7UM61 Manual
C53000-G1176-C127-3
4.5 Unbalanced Load (Negative Sequence) Protection (ANSI 46)
Admissible unbalanced load I
(also alarm stage)
Unbalanced load tripping stage I
Delay times T , T
Alarm I2>>
Asymmetry factor FACTOR K
Cooling time factor T
Cool
see also Figure 4-5
Pickup Times (Stage characteristic)
Dropout Times (Stage characteristic)
Warning StageI , Tripping stage I2>> Approx. 0.95
2 adm.
Thermal tripping stage
Pickup Values I , I >>
2 Adm. 2
Delay Times
thermal characteristic
Time for 2 ≤ I ≤ 20
/I
2 2 Adm.
/I 3.0 % to 30.0 %
2 Adm. N
>>/I 10 % to 100 %
2 N
0.00 s to 60.00 s
or ∞ (ineffective)
2.0 s to 100.0 s
or ∞ (ineffective)
0 s to 50,000 s
approx. 50 ms
approx. 50 ms
Dropout on undershoot of I
3 % of setting value or 0.3 % unbal. load
1 % or 10 ms
5 % of reference (calculated) value +1 % current
tolerance, or 600 ms
Increments 0.1 %
Increments 0.1 %
Increments 0.01 s
Increments 0.1 s
Increments 1 s
2 Adm.
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