Metrological Functions; Clock Information - Landis+Gyr E470 Series User Manual

Functional overview
3.4

Metrological functions

3.5

Clock information

D000058620 en a – E470 Series 3 SMETS2 100 mm – ZCX310 – User Manual and Functional Description
Issue 1.2
An independent measurement chip and current shunt integrated into the
live phase supply control switch assembly comprise the energy measure-
ment system.
Energy values measured by the measurement chip are acquired once per
second. Received energy values are added to the corresponding register.
The meter is capable of 4 quadrant measurement. The following energy
quantities will be measured and recorded:

Active import and export energy (+A, Wh), (-A, Wh)

Summation of active import and export energy ([+A] + [-A], Wh)

Net of active Import and export energy ([+A] – [-A], Wh)

Reactive energy import and export (+R, varh), (-R, varh)

Reactive energy per quadrant:
–
Reactive inductive import and export energy
(+Ri (QI), and -Ri (QIII), varh)
–
Reactive capacitive import and export energy
(-Rc (QII) and -Rc (QIV), varh)

Apparent energy import and export (+VA, -VA)
The meter monitors the following instantaneous values:

Phase voltage U (V)

Phase current I (A)

Network frequency fn (Hz)

Active power P (W)

Reactive power Q (VAr)

Apparent power S (VA)
The E470 contains an internal clock which can be used for various
functions within the meter including:

time indication on the meter display ;

to control the time-of-use rate and (HC)ALCS switching;

for the timestamps in profiles, registers and event logs;

for the implementation of future-dated commands.
In SMETS2 installations the master time reference is taken from the
communications hub at the time the meter is commissioned and time
synchronisation with the communications hub is then performed on power-
up and every 24 hours.
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