Electrical Connection; Closed Loop - janitza SVG Series User Manual

SVG 50/100
5.2

Electrical connection

Definition of terms:
• Open Loop / Closed Loop:
When connecting the converter to the SVG, a distinction is made between the two
connection versions "open loop" and "closed loop".
• With a "retrofit" installation, the converter typically is located on the network side (these
converters are usually integrated in the feed).
In the case of a "retrofit" installation, the closed loop connection version can be used if only
one filter module is installed.
If more than one filter module is installed, use of the open loop connection version is man-
datory. If this is not possible, summation current transformers must be employed (see the
section "Closed Loop").
Of decisive importance for the current transformer installation is that the SVG only "sees"
the load current, i.e. the current of the SVG is subtracted for the calculation of the com-
pensation current. Ensure that the current transformer is connected correctly.

5.2.1 Closed Loop

1S
Grid side
e.g.
UMG 512
UMG512
Figure 3-4a, Closed Loop
20
NOTE
CT
1S
1 2
2S 2S
1 2
3S 3S
1 2
A B C N
A
A-N
PE
B
SVG
B-N
C
C-N
Load side