Multi-Tech Systems 7500 - Manual (Page 304)

Magnitude of Voltage Supply ION 7500 / ION 7600 User’s Guide
Page 304 Power Quality: ION Meters and EN50160 Technical Note
Magnitude of Voltage Supply
Each measurement is the mean of RMS voltage for each phase over fixed 10-minute
intervals. The nominal value is defined by the Sag/Swell module’s Nom Volts setup
register.
N OTE
Nom Volts is typically setup when the meter is placed into service; if Nom Volts has not been set, enter a
value for your system’s nominal voltage. This value will be used in all EN50160 compliance calculations.
Observation period of one week with fixed steps of 10 minutes.
N = number of 10-minute intervals in which the supply voltage is within ±15% of
nominal.
N
1
= number of intervals in which the supply voltage differs more than 10%
from nominal and supply voltage is within ±15% of nominal.
Supply voltage complies with the standard if N
1
/N <= 5% during the observation
period (1 week by default).
EN 50160 data (current observation period): The meter generates the N and N
1
counts for each phase as described above. These counters are reset at the beginning
of the next observation period.
EN 50160 data (previous observation period): The meter stores the N and N
1
counter values at the end of each observation period before these counters are
reset. These 6 registers are also stored in a data recorder for each observation
period.
Events: The meter creates a message in the Event log every time the N
1
counter for
each phase increases.
Parameter data: The meter can be enabled to record the 10-minute mean, ½ cycle
minimum and ½ cycle maximum values of supply voltage for each phase into a
data recorder every 10 minutes.