Current Transformer (Ct) Installation On The Load Side (Open Loop) - janitza SVG Series User Manual

SVG 50/100

5.5.2 Current transformer (CT) installation on the load side (open loop)

After the installation of the CT on the load side, the signal is transmitted to the SVG (see
Figure 3-20).
In a 3-phase conductor system with an N-conductor, a CT group (3 current transformers)
must be used detect the current.
Take note of and check the CT installation:
• Ensure that S1 and S2 are connected correctly.
• Check the phase assignment.
The circuit diagrams shown here are simplified (single line display of three-phase conductor sys-
tems)
Grid side
Figure 3-20 Current transformer connection on the load side (single line representation)
Kompensation
There are three options for the installation of current transformers on the load side:
Figures 3-21 (a), 3-21 (b) and 3-21 (c)
In Figure 3-21 (a), two groups of CTs (6 CTs) and a summation current transformer are
required for the installation.
The installation of the 2nd CT group enables a differentiated capture of the capacitive load
current. The load current results from the sum of the currents that are captured by the two
CT groups (according to Kirchhoff's law of current distribution).
34
NOTE
CT
Load side
S1 S2
SVG
CT
S1 S2
SVG
CT
S1 S2
Kompensation
SVG