Short and long interruptions

All interruption detection measurements are performed as defined by IEC 61000-4-30.

Interruption detection is based on per phase 1-cycle RMS measurements. The duration of the interruption corresponds to the period during which the RMS value remains less than 5% of the nominal voltage on all phases. The observation period is 1 week.

Interruption counters classification

Duration of interruption	Duration < 1s	1s ≤ duration < 3min	duration ≥ 3min
Number of interruptions	N₁	N₂	N₃

EN50160 data (current observation period): the meter maintains the counters listed in the previous table for each phase. These counters are reset at the beginning of the next observation period.

EN50160 data (previous observation period): the meter stores the counters listed in the previous table for each phase on a weekly basis before these counters are reset. These registers are also stored in a data recorder for each observation period.

Events: the meter creates an entry in its onboard event log every time one of the counters listed in the previous table increases.

Counters for the current observation period are located in Bin modules and recorded weekly by the EN50160 Intrp data recorder. Counters from the previous observation (PO) period are located in Store modules labeled with the prefix PO.

Register label (current observation period)	Register label (previous observation period)
V-Intrpt N1	PO V-Intrpt N1
V-Intrpt N2	PO V-Intrpt N2
V-Intrpt N3	PO V-Intrpt N3

Parameter data is also recorded at every interruption event by the 4-30 Intrp Log.

Register label	Description
V Irtp DrtnAll	Interruption duration