VAMP 130 - Three-Phase Overcurrent Protection with Two Current Transformers

VAMP 130 Overcurrent and earth-fault relay
Technical Description
VAMP Ltd
28
Vamp 24h support phone : +358 (0)40 573 6316 VM130.EN003
3.5. Three-phase overcurrent protection
with two current transformers
2
19
12
1
20
11
3
17
4
16
5
14
6
13
9
7
12
8
8
11
7
9
10
10
X1
X1
X2
IL3
1A
5A
I 0
X2
5
4
VAMP 130
DI
T1
T2
A1
A2
A3
IF
Protection function
3I>>>
L>
3I >
3I >>
Measurement
functions
!
!
!
Phase currents,
residual current,
frequency, ILmax
15 min average load
current value,
15 min maximum
load current value
Disturbance
Recorder
~
IL1
1A/5 A
IL2
1A/5 A
1A/5 A
CBFP
DR
kuvax9
Figure 3.5-1 When current transformers are available on only two phases, the
three-phase overcurent protection can be carried out by connecting the
current transformers as shown in the above figure.