52
Technical features
Conformity to IEC 61000-4-30
Characteristics of "power quality assessment functions"
Function symbols
Function performance class according to
IEC 61000-4-30
Measuring range
Other complementary
characteristics
P
inst
S
-
U
dip
S
-
U
swl
S
-
U
int
S
-
U
nba
S
-
N
Tm
= Total number of measurements
N
OT
= Number of measurements out of range
1 Dip
Dip is a temporary drop in mains voltage.
Dip begins when the RMS value of one or more supply voltages falls below a set threshold and it ends when the three
voltages rise above the set threshold to which the hysteresis has been added.
2 Swell
Swell is a temporary overvoltage of the mains voltage.
Swell starts when the value of one or more supply voltages rises above a set threshold and ends when the three
voltages fall below the set threshold minus the hysteresis.
3 Interruption
Interruption is a temporary drop in mains voltage.
Interruption begins when the RMS value of the three network voltages falls below a set threshold and ends when one
of the voltages rises above the set threshold to which the hysteresis has been added.
4 RVC
Rapid Voltage Change is a fast variation in the power supply voltage.
It begins when the RMS value of one of the power voltages differs by more than a set value from the
average of the last 100/120 (50 / 60Hz) RMS values calculated on the half cycle and ends when the average differs
for less than the set value.
5 SVC
Slow Voltage Change is a slow change in voltage.
It is a percentage measurement of the voltage shunt.
N
Tm
- N
OT
SVC = . 100
NT
For each of the events described, the device saves:
1
Time stamp : Event start date and time
2
Duration of the event in msec (10msec….60000msec)
3
Residual values per phase (RMS values reached by the network voltages during the event)
The device can save up to 3840 events.
The save mode is that of the circular list where the oldest events are replaced by the most recent ones.
6 Pinst
The Flicker is the periodic variation of the intensity of an incandescent lamp due to a variation in the supply voltage.
Pinst is a measure of the sensation of instant flicker.
Summary of Contents for NEMO 96 EA MFQ96021
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