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The instrument will detect Voltage Anomalies if the RMS Voltage Values (calculated every
10ms) beyond the above calculated thresholds. These limits remain unchanged
throughout the recording period.
When a Voltage anomaly occurs the instrument records:
• The number corresponding to the phase where the anomaly occurred.
• The "direction" of the anomaly: "Surge" and "Sag" identify respectively voltage drops
(Sag) and peaks (Surge).
• The date and time of the beginning of the event in the form day, month, year, hour,
minutes, seconds, hundredths of second.
• The duration of the event, in seconds with a resolution of 10ms.
• The minimum (or maximum) value of voltage during the event.
16.6.
VOLTAGE AND CURRENT HARMONICS
16.6.1. Theory
Any periodical non-sine wave can be represented as a sum of sinusoidal waves having
each a frequency that corresponds to an entire multiple of the fundamental, according to
the relation:
where:
V
= Average value of v(t)
0
V
= Amplitude of the fundamental of v(t)
1
V
= Amplitude of the k
k
∞
∑
=
+
v(t)
V
V
0
=
k
1
th
harmonic of v(t)
ω
ϕ
+
sin(
t
)
k
k
k
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