ABB REF542plus - Functional Check

Multifunction Protection and Switchgear Control unit REF542plus
Manual: Motor Protection with ATEX-Certification
The table below summarizes the times resulting for the tripping characteristic with and
without 100% preloading.
Table 4: Tripping time for thermal protection at t
6IB
= 5sec or τ = 146sec
I/I
B
0% preloading 100% preloading
1,15 359,79 153,76
1,20 267,81 94,71
1,40 140,25 36,04
1,60 93,43 21,11
1,80 68,26 14,37
2,00 52,60 10,59
2,20 42,00 8,21
2,40 34,43 6,58
2,60 28,79 5,42
2,80 24,47 4,55
3,00 21,08 3,88
4,00 11,48 2,06
5,00 7,24 1,28
6,00 4,99 0,87
7,00 3,65 0,64
8,00 2,79 0,49
9,00 2,20 0,38
10,00 1,78 0,31
4.4.3 Functional check
For functional testing, we recommend to use three-phase testing equipment. If a func-
tional test is to be carried out with single-phase testing equipment, attention is to be
paid to the fact that the current has to be raised in order to achieve the same r.m.s.
value as with a three-phase system. For calculating the memory contents, the
REF542plus assumes that the root-mean-square value of the current in the individual
phases is present.
3
(3pol)
2
L3
2
L2
2
L1
Mitte
III
I
l
++
=
(17.)
Where:
I
mittel (3-pole)
Root-mean-square value of the current causing the temperature
rise in a three-pole functional test
I
L1
Current in conductor L1
I
L2
Current in conductor L2
I
L3
Current in conductor L3
Therefore, in a single-phase test equipment, a temperature rise at a current of is as-
sumed.
3
(1pol)
2
L1
Average
I
I =
(18.)
1VTA100114-Rev. 04 en PTMV, 19.01.05 Motorprotection 26 / 66
Valid from Version V4D02