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Manual ibaPQU-S
112
Issue 1.3
13.2.3 Delta connection
Figure 72: Delta connection direct connection
13.2.4 Connection with instrument transformers
It is important that the instrument transformers are Open Loop transformers. This means
that a sinus signal on the primary side also needs to exist on the secondary side. The
instrument transformers also need to offer a broadband frequency transmission in order
to capture harmonics or interharmonics up to the 50th harmonic.
The terminals of the primary winding are labeled "K" and "L" or "P1" and "P2", the termi-
nals of the secondary winding are labeled "k" and "l" or "S1" and "S2". The polarity must
be applied so that the "current flow direction" is from K to L.
Figure 73: Example of 1-phase connection