Multi-Tech Systems 7500 - Manual (Page 310)

Supply Voltage Dips ION 7500 / ION 7600 User’s Guide
Page 310 Power Quality: ION Meters and EN50160 Technical Note
Supply Voltage Dips
The voltage dip is based on half-cycle RMS measurements. The duration of the dip
corresponds to the period during which the RMS value remains less than 90% of
the nominal voltage. The depth of the dip is defined as the difference (expressed in
% of nominal voltage) between the minimum RMS voltage over the course of the
dip 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 minimum RMS voltage for
each phase during a dip, the duration of the dip and the timestamp for when the
dip occurred.
Voltage Dips Default Measurements
Values from the current observation period (in the first four columns) are found in
Bin modules. They are also logged weekly by Data Recorder modules 19 – 23.
Values from previous observation (PO) period are found in Store modules.
Depth (d%)
Duration (t) 10ms <=
t <100ms 100ms <=
t < 500ms 500ms <=
t < 1s
1s < t < 3s 3s <= t < 20s
20s <= t <
1min
10 < d < 15 N
11
N
21
N
31
N
41
N
51
N
61
15 <= d < 30 N
12
N
22
N
32
N
42
N
52
N
62
30 <= d < 60 N
13
N
23
N
33
N
43
N
53
N
63
60 < d <99 N
14
N
24
N
34
N
44
N
54
N
64
Register Labels
V1-Dip N11 V1-Dip N12 V1-Dip N13 V1-Dip N14 PO V1-Dip N11 PO V1-Dip N12 PO V1-Dip N13 PO V1-Dip N14
V1-Dip N21 V1-Dip N22 V1-Dip N23 V1-Dip N24 PO V1-Dip N21 PO V1-Dip N22 PO V1-Dip N23 PO V1-Dip N24
V1-Dip N31 V1-Dip N32 V1-Dip N33 V1-Dip N34 PO V1-Dip N31 PO V1-Dip N32 PO V1-Dip N33 PO V1-Dip N34
V1-Dip N41 V1-Dip N42 V1-Dip N43 V1-Dip N44 PO V1-Dip N41 PO V1-Dip N42 PO V1-Dip N43 PO V1-Dip N44
V1-Dip N51 V1-Dip N52 V1-Dip N53 V1-Dip N54 PO V1-Dip N51 PO V1-Dip N52 PO V1-Dip N53 PO V1-Dip N54