HT Italia SOLAR300, User Manual, Page: 152 / 160

SOLAR300 - SOLAR300N
EN - 150
10.9. VOLTAGE FAST TRANSIENTS (SPIKES)
The meter considers all the phenomena associated to the phase voltage as voltage spikes
which have the following properties:

Fast slope variations of voltage waveforms.

Exceeding a limit threshold fixed by user before starting a recording.
The maximum number of recorded events in a half period (10ms @ 50Hz, 8.3ms @ 60Hz)
is
4 . The maximum number of recorded events by meter during a recording is 20000 .
To better understand the features of this analysis refer to the following picture where a
typical voltage spike at 50Hz frequency is shown:
Fig. 177: Typical voltage spikes at 50Hz frequency
The meter continuously checks the input voltage signals performing 2 simultaneous
routines with different sampling rates. In particular:

SLOW : The signals of input voltage are sampled with a 256 samples/period
rate (20ms @ 50Hz, 16.7ms @ 60Hz).

FAST: The signals of input voltage are sampled at 200kHz frequency.
As soon as an event occurs, the meter automatically checks whether one of the following
conditions are respected:

dV/dt > 100V/5

s

type of event FAST.

dV/dt > 100V/78

s

type of event SLOW @ 50Hz.

dV/dt > 100V/65

s

type of event SLOW @ 60Hz.