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1. (WO2018122160) ELECTRICITY METER WITH AN IMPEDANCE LEARNING ALGORITHM

Pub. No.:    WO/2018/122160    International Application No.:    PCT/EP2017/084360
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Sat Dec 23 00:59:59 CET 2017
IPC: G01R 21/133
G01R 22/10
Applicants: KAMSTRUP A/S
Inventors: KIRKEGAARD, Dennis
Title: ELECTRICITY METER WITH AN IMPEDANCE LEARNING ALGORITHM
Abstract:
The present invention relates to an electricity meter adapted to measure electricity consumption in an electricity distribution network with three phases, wherein the electricity meter comprises a measuring circuit for measuring voltages and currents for each of the three phases, a microcontroller unit configured to calculate the electric energy supplied from the electricity distribution network via the phases, and an impedance learning algorithm unit for estimating impedance values of the electricity distribution network as seen at the electricity meter. The impedance learning algorithm unit is arranged to continuously calculate symmetrical components of the three phases based on measured voltages and currents from the three phases and to estimate zero- and negative sequence impedances as the ratio between a summation of changes in the zero- and negative sequence voltages and a summation of the changes in the zero- and negative sequence currents, respectively.