Installation Guide
Page 38 of 53
The clamp-on current transformers are
clamped around the corresponding lines. The
energy flow direction of the clamp-on current
transformer must be observed.
The energy flow in the line must run from K to L
(generation to the loads).
In the case of a one-phase PV inverter or a single-phase mains, only the clamp-on
current transformer for the phase in question is connected. The other two clamp-on
current transformers must not be connected.
Figure 26: Connecting the clamp-on current transformers: three-phase (left) vs single-phase (right) installation
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Do not confuse the phases! Power measurement only works if the current and
voltage of the same phase are measured.
Example: The clamp-on current transformer L1 (marked with number (1)) must be
connected to phase L1. This phase L1 must also be connected to terminal L1 of the
voltage measurement terminal strip. Only then the correct power for phase L1 can be
determined.
Figure 25: Energy flow direction vs CT direction
