Supply voltage dips – Multi-Tech Systems 7500 User Manual

Page 310

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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

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