Installation and connection
15
Figure 4 Extended connection
2.8 Extended connection
This type of connection offers a more precise
measuring procedure for the overcurrent in
the capacitor.
In this case, the terminal ”Meas” is attached
to another phase conductor of the AC mains
network. The voltage signal for the internal
measurements is tapped between terminal
”L” and terminal ”Meas”.
Because the voltage signal is recorded between
two phase conductors to which the capacitors
are also connected, the dU/dt measuring
procedure can be used for calculating the
overcurrent.
This means that all frequencies up to the 31st
harmonic are taken into account calculating
harmonic overcurrent in the capacitor (see
also section 4.2).
The total harmonic distortion factor of the
voltage (thd) is also measured between the
phase conductors in this type of connection.
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