Multifunction Protection and Switchgear Control unit REF542plus
Manual: Motor Protection with ATEX-Certification
Unbalanced Load Protection
0,1
1,0
10,0
100,0
1000,0
0,0 0,5 1,0 1,5 2,0 2,5 3,0
I2/IMn
Time in s
Operation Time in s
Figure 10: Tripping characteristic for thermal protection at τ = 146sec or t
6IB
= 5sec
The table below gives an overview of the times resulting for the tripping characteristic.
Table 5: Tripping time for the unbalanced load protection
I2/IMn Tripping Time
0,20 166,67
0,30 62,5
0,40 33,33
0,50 20,83
0,60 14,23
0,70 10,42
0,80 7,94
0,90 6,25
1,00 4,95
1,20 3,5
1,30 2,98
1,40 2,56
1,50 2,23
2,00 1,25
2,50 0,8
3,00 0,56
1VTA100114-Rev. 04 en PTMV, 19.01.05 Motorprotection 30 / 66
Valid from Version V4D02
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