Landis+gyr Ag

Adrian Ulrich

Jacob De Vries

A measuring circuit arrangement () for an electricity meter for direct connection is respectively connected, to an input () for voltage measurement and an input () for current measurement of a measuring chip () for each phase of a three phase supply. Upstream of the input () for voltage measurement is a voltage divider (RR) provided in order to match the voltage level, and upstream of the input () for current measurement is a voltage transformer () with measuring shunt (R) installed according to the invention. The voltage transformer () is so arranged that its ohmic resistance towards the measuring shunt (R) on the one hand sufficiently limits standard direct-current impingement of the voltage transformer () and on the other hand this ohmic resistance is also small enough so that, together with the inductance of the current transformer (), it displays no more than standard angle error.

Measuring circuit arrangement for electricity meters for direct connection

The invention relates to a compensation circuit for the phase shift between a first input () for a voltage determination and a second input () for a current determination in electric meters for direct connection, whereby a DC-tolerant converter (), for current transformation, is arranged before said second input () and a high pass filter (R, C) is arranged before the first input (), for a first equalisation of the non-frequency-dependant phase compensation. A further equalisation of the phase compensation occurs by means of a correction device () in a measuring chip (), which is connected in series with the inputs () for voltage determination and current determination.

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Engelberg, Switzerland

Adrian Ulrich