Table des Matières
Publicité
• Technical characteristics
Characteristics of "power quality assessment functions"
Function symbols
Pinst
Udip
Uswl
Uint
Unba
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 vol-
tages 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.
SVC = -------------------- * 100
For each of the events described, the device saves:
- Time stamp : Event start date and time
- Duration of the event in msec (10 msec....60000 msec)
- Residual values per phase (RMS values reached by the network voltages during the event)
The device can save up to 3840 events.
Save mode: 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.
58
®
Function performance class according to
IEC 61557-12
N
- N
Tm
OT
N
Tm
Conformity IEC 61557-12 Edition 1 (08/2007)
S
S
S
S
S
Other complementary
Measuring range
-
-
-
-
-
N
= Total number of measurements
Tm
N
= Number of measurements out of range
OT
characteristics
Publicité
Table des Matières
