METREL MI 2885, Руководство пользователя

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MI 2893 / MI 2892 / MI 2885 EN 50160 Standard Overview
209
t
U
Level
Allowed waveform area
(envelope)
Figure 175: Transients trigger detection (envelope)
Level trigger is activated if sampled voltage/current is greater than given limit.
t
U
Level
Figure 176: Transients trigger detection (level)
Note: Saving to the instrument data memory induces dead time between consecutive transient records
up to 8 seconds, before new transient can be captured.
5.2 EN 50160 Standard Overview
EN 50160 standard defines, describes and specifies the main characteristics of the voltage at a network
user’s supply terminals in public low voltage and medium voltage distribution networks under normal
operating conditions. This standard describes the limits or values within which the voltage
characteristics can be expected to remain over the whole of the public distribution network and do not
describe the average situation usually experienced by an individual network user. An overview of EN
50160 Low voltage limits are presented on table below.
Table 142: EN 50160 standard LV limits (continuous phenomena)
Supply voltage phenomenon Acceptable
limits Meas.
Interval Monitoring
Period Acceptance
Percentage
Power frequency
49.5 ÷ 50.5 Hz
47.0 ÷ 52.0 Hz
10 s 1 Week
99,5%
100%
Supply voltage variations, U
Nom
230V ± 10% 10 min 1 Week 95%