4.5 Unbalanced Load (Negative Sequence) Protection (ANSI 46)
317
7UM61 Manual
C53000-G1176-C127-3
4.5 Unbalanced Load (Negative Sequence) Protection (ANSI 46)
Setting Ranges / Increments
Trip Time Characteristics
Times
Dropout Conditions
Tolerances
Admissible unbalanced load I
2 Adm.
/I
N
(also alarm stage)
3.0 % to 30.0 % Increments 0.1 %
Unbalanced load tripping stage I
2
>>/I
N
10 % to 100 % Increments 0.1 %
Delay times T
Alarm
, T
I2>>
0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
Asymmetry factor FACTOR K 2.0 s to 100.0 s
or ∞ (ineffective)
Increments 0.1 s
Cooling time factor T
Cool
0 s to 50,000 s Increments 1 s
see also Figure 4-5
Pickup Times (Stage characteristic)
Dropout Times (Stage characteristic)
approx. 50 ms
approx. 50 ms
Warning StageI
2 adm.
, Tripping stage I2>> Approx. 0.95
Thermal tripping stage Dropout on undershoot of I
2 Adm.
Pickup Values I
2 Adm.
, I
2
>> 3 % of setting value or 0.3 % unbal. load
Delay Times 1 % or 10 ms
thermal characteristic
Time for 2 ≤ I
2
/I
2 Adm.
≤ 20
5 % of reference (calculated) value +1 % current
tolerance, or 600 ms
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