Measuring circuit arrangement for electricity meters for...

Details Measuring circuit arrangement for electricity meters for... Measuring circuit arrangement for electricity meters for...

2006-02-28

2006-02-28

Nguyen, Vinh (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Demand, excess, maximum or minimum

C324S1540PB, C324S127000, C324S142000, C324S074000

Reexamination Certificate

active

07005844

ABSTRACT:
A measuring circuit arrangement (1) for an electricity meter for direct connection is respectively connected, to an input (3) for voltage measurement and an input (4) for current measurement of a measuring chip (2) for each phase of a three phase supply. Upstream of the input (3) for voltage measurement is a voltage divider (R1,R2) provided in order to match the voltage level, and upstream of the input (4) for current measurement is a voltage transformer (5) with measuring shunt (RSH) installed according to the invention. The voltage transformer (5) is so arranged that its ohmic resistance towards the measuring shunt (RSH) on the one hand sufficiently limits standard direct-current impingement of the voltage transformer (5) and on the other hand this ohmic resistance is also small enough so that, together with the inductance of the current transformer (5), it displays no more than standard angle error.

REFERENCES:
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patent: 5264786 (1993-11-01), Clarke et al.
patent: 5453697 (1995-09-01), Schweer et al.
patent: 5777835 (1998-07-01), Innes
patent: 5949231 (1999-09-01), Lau
patent: 6534967 (2003-03-01), Weggel
patent: 0 414 657 (1990-09-01), None

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