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3 Phase Power Quality Analyzer
Glossary
49
Power Quality Events
Voltage Dips. On single-phase systems, a voltage dip begins when the voltage falls below the
dip threshold and ends when the voltage is equal to or above the dip threshold plus the
hysteresis voltage. See Ta b l e 9 .
On polyphase systems, a dip begins when the voltage of one or more channels is below the dip
threshold and ends when the voltage on all measured channels is equal to or above the dip
threshold plus the hysteresis voltage.
Choose nominal or sliding reference voltage. A sliding reference voltage uses measured
values filtered with a 1-minute time constant and applies usually only for medium and high
voltage systems.
Measurement Modes:
PQ Meter
PQ Logger
Configuration:
The threshold limit value is defined as % of nominal voltage or sliding reference. The
default value is 90 % and the hysteresis is 2 %.
Table 9. Characteristics of a Voltage Dip
Reference Voltage
Hysteresis
Threshold
Time
Duration
Magnitude
A
B
C
D
F
E
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