Circutor QNA-303, Руководство пользователя

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ANALYZER OF THE QUALITY OF ELECTRIC POWER SUPPLY QNA-303 -- Page 7
3.- ANALYSIS MODES
QNA-303 series analyzers can perform under different operation modes
according to the previous setting.
Most remarkable operation settings are these following:
•
Measurement and collection in memory of main power quality parameters
(voltage values, flicker and harmonics).
•
Setting of a voltage threshold to define diverse event occurrences (voltage
sags, voltage swells and interruptions). Also an optional setting of a hysteresis
value for each individual threshold.
•
The QNA-303 can perform quality analysis either over 3-wire or 4-wire
distribution systems. In accordance to the choice, all quality measurement will
be referred to the line-to-neutral or line-to-line voltage..
3.1.- Instantaneous values of L1, L2 & L3 (4-wire connection)
- Line-to-neutral VOLTAGE of every phase, RMS value: V
1
, V
2
, V
3
.
∫
⋅ = =
dt t u
T
Vrms Vn
2
) (
1
;
∑
=
N
U
N
Vrms
1
2
) (
1
- FREQUENCY: F (Hz) Measured over L1 voltage phase.
3.2.- Instantaneous values of L1, L2 & L3 (3-wire connection)
- Line-to-line VOLTAGE of every phase, RMS value: V
12
, V
23
, V
31
.
∫
⋅ = =
dt t u
T
Vrms Vn
2
) (
1
;
∑
= N
U
N
Vrms
1
2
) (
1
- FREQUENCY: F (Hz) Measured over L1 voltage phase.