Multi-Tech Systems 7500 - Manual (Page 313)

ION 7500 / ION 7600 User’s Guide Temporary Overvoltages
Power Quality: ION Meters and EN50160 Technical Note Page 313
Temporary Overvoltages
Overvoltage detection is based on half-cycle RMS measurements.The duration of
the overvoltage corresponds to the period during which the RMS value remains
more than 110% of the nominal voltage. The magnitude of the overvoltage is
defined as the ratio (expressed in %) between the maximum RMS voltage during
the overvoltage and the nominal voltage.
The observation period is 1 week. No evaluation criteria are suggested by either
the EN 501060 standard or the UNIPEDE Measurement Guide for Voltage
Characteristics; you should apply your own criteria to the data captured by the
meter. The table below defines the classification scheme for counters Nij:
EN 50160 data (current observation period): The meter maintains the counters
listed in the table above for each phase. These counters are reset on a weekly basis.
EN 50160 data (previous observation period): The meter stores the counter values
listed in the table above for each phase on a weekly basis before these counters are
reset. These registers are also stored in a data recorder on a weekly basis.
Events: the meter creates a message in the Event log every time one of the counters
increases.
Parameter data: The meter can be enabled to record the maximum RMS voltage for
each phase during an overvoltage, the duration of the overvoltage and the
timestamp for when the overvoltage occurred.
Overvoltages Default Measurements
The data below is from the present observation period; values are all located in Bin
modules. They are also recorded weekly by Data Recorders 25, 26, and 27.
Overvoltages / Duration “t” t < 1s 1s <= t < 1 min t >= 1 min
110 < magnitude <= 120 % N
11
N
21
N
31
120 < magnitude <= 140 % N
12
N
21
N
32
140 < magnitude <= 160 % N
13
N
23
N
33
160 < magnitude <= 200 % N
14
N
24
N
34
magnitude > 200 % N
15
N
25
N
35
Register Labels
V1-Ovrvlt N11 V1-Ovrvlt N12 V1-Ovrvlt N13 V1-Ovrvlt N14 V1-Ovrvlt N15
V1-Ovrvlt N21 V1-Ovrvlt N22 V1-Ovrvlt N23 V1-Ovrvlt N24 V1-Ovrvlt N25
V1-Ovrvlt N31 V1-Ovrvlt N32 V1-Ovrvlt N33 V1-Ovrvlt N34 V1-Ovrvlt N35
V2-Ovrvlt N11 V2-Ovrvlt N12 V2-Ovrvlt N13 V2-Ovrvlt N14 V2-Ovrvlt N15
V2-Ovrvlt N21 V2-Ovrvlt N22 V2-Ovrvlt N23 V2-Ovrvlt N24 V2-Ovrvlt N25
V2-Ovrvlt N31 V2-Ovrvlt N32 V2-Ovrvlt N33 V2-Ovrvlt N34 V2-Ovrvlt N35