Multi-Tech Systems 7500 - Manual (Page 302)

Default EN50160 Measurements ION 7500 / ION 7600 User’s Guide
Page 302 Power Quality: ION Meters and EN50160 Technical Note
Default EN50160 Measurements
The EN50160 standard divides voltage characteristics into 10 distinct components.
Each component has operating conditions and requirements for “valid” samples
(such as a measured voltage between ±15% of nominal).
The factory configured meter uses a counter-based (N, N
1
, N
2
...) scheme to
evaluate the compliance of each component within a defined observation period.
Counter statistics are provided for current and previous observation periods; a
brief description of each counter is also provided. The Data Logging section for
each component provides a number of data log viewers for counter and parameter
data. The following sections describe the data and statistics provided for each
EN50160 measurement.
N OTE
Refer to “EN50160 External Controls” on page 323 for details on enabling EN50160 parameter data
logging.
Power Frequency
The frequency measurement is a mean value over fixed 10-second intervals. The
nominal value for frequency is 50 Hz (or 60 Hz, depending on model number).
Observation period of one week with fixed steps of 10 seconds.
N = number of 10-second intervals in which the supply voltage is within ±15% of
nominal.
N
1
= number of intervals in which the frequency differs more than 0.5 Hz from
nominal and the supply voltage is within ±15% of nominal.
N
2
= number of intervals in which the frequency is +2 Hz or -3 Hz from nominal
and the supply voltage is within ±15% of nominal.
Power frequency complies with the standard if N
1
/N <= 5% and N
2
= 0 during the
observation period (1 week by default).
EN 50160 data (current observation period): The meter generates the N, N
1
and
N
2
counts described above. These counters reset at the beginning of the next
observation period.
EN 50160 data (previous observation period): The meter stores the N, N
1
and N
2
counter values at the end of each observation period before these counters are
reset. These three 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
and N
2
counters increase.
Parameter data: The meter can be enabled to record the 10-minute mean, ½ cycle
minimum and ½ cycle maximum values of frequency into a data recorder every 10
minutes.