Technical Data
4.5 Unbalanced Load (Negative Sequence) Protection (ANSI 46)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
473
4.5 Unbalanced Load (Negative Sequence) Protection (ANSI 46)
Setting Ranges / Increments
Trip Time Characteristics
Times
Dropout Conditions
Tolerances
Influencing Variables for Pickup Values
Admissible unbalanced load I
2 perm.
/I
N
(also alarm stage)
3.0 % to 30.0 % Increments 0.1 %
Unbalanced load tripping stage I
2
>>/I
N
10 % to 200 % Increments 1 %
Delay times T
Alarm
, T
I2>>
0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
Asymmetry factor FACTOR K 1.0 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
Alarm stage I
2 perm.
, Tripping stage I2>> Approx. 0.95
Thermal tripping stage Dropout on undershoot of I
2 perm.
Pickup values I
2 perm.
, 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 perm.
≤ 20
5 % of reference (calculated) value +1 % current toler-
ance, or 600 ms
Power supply direct voltage in range 0.8 ≤ U
Aux
/U
AuxN
≤ 1.15 ≤ 1 %
Temperature in range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) ≤ 0.5 %/10 K
Frequency in range 0.95 ≤ f/f
N
≤ 1.05 ≤ 1%
Harmonics
– Up to 10 % 3rd harmonic
– Up to 10 % 5th harmonic
≤ 1%
≤ 1%
To Next Page
Loading...
Need help?
General
