janitza UMG 509, Operation Manual And Technical Data, Page: 30 / 124

30
UMG 509
Total current measurement
If the current measurement is done via two current
transformers, the overall transformation ratio
of the current transformers must be programmed into
the UMG 509.
Fig. Example, current measurement via a total
current transformer
UMG
S
2
I
S
1
P
1
P
2
Einspeisung 1
Supply 1 Einspeisung 2
Supply 2
1P
1
1P
2
(K)
(L)
(k)
(l)
1S
2
1S
1
1S
1
1S
2
2S
1
2S
2
2S
1
2S
2
(k)
(l)
(K)
(L)
2P
1
2P
2
Verbraucher A
Consumer A Verbraucher B
Consumer B
Example:
The current is measured via two current transformers.
Both current transformers have a transformation ratio
of 1000/5A. The summation measurement is performed
using a total current transformer 5+5/5A.
The UMG 509 must then be setup as follows:
Primary current: 1000A + 1000A = 2000A
Secondary current: 5A