1 Scope
This European Technical Report applies to newly manufactured static watt-hour meters
intended for residential, commercial and light industrial use, of class indexes A,
B and C, for the measurement of alternating current electrical active energy in 50 Hz
networks. It specifies particular requirements and immunity test for direct connected
and transformer connected electricity meters as an extension for EN 50470‑1 and EN 50470‑3. The tests are designed to achieve immunity against disturbing currents of up to 2 A (2 kHz-30 kHz) and up to 1 A (30 KHz-150 kHz) for direct connected meters
and 2 % Imax (2 kHz-30 kHz) and 1 % Imax (30 KHz-150 kHz) for transformer connected
meters.
It applies to static watt-hour meters for indoor and outdoor application, consisting
of a measuring element and register(s) enclosed together in a meter case.
If the meter has (a) measuring element(s) for more than one type of energy (multi-energy
meters), or when other functional elements, like maximum demand indicators, electronic
tariff registers, time switches, ripple control receivers, data communication interfaces
etc. are enclosed in the meter case (multi-function meters) then this Technical Report
applies only for the active energy metering part.
This Technical Report distinguishes between:
– meters of class indexes A, B and C;
– direct connected and transformer operated meters;