Signaling Voltage; Unbalance, Overdeviation, Underdeviation - Fluke 1760 User Manual
Power quality recorder
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Also See for 1760:
- Datasheet (8 pages) ,
- Getting started manual (24 pages) ,
- Getting started manual (24 pages)
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1760
Users Manual
PQ Analyze supports both formulas, the user can select the formula he wants to use.
K-Factor (US) and Factor K (EU) are only available via the Measurement menu.
Signaling Voltage
Ripple Control Signals
The frequency of the ripple control signal of the local utility can be defined in the PQ
Analyze software in the trigger settings dialogue. These signals are calculated from the
FFT results. The FFT bin related to the signaling voltage is calculated from the rated
signaling frequency and the nominal power frequency (derived from the 50 Hz or 60 Hz
setting in the PQ Analyze software) using 2.048 samples per 10/12 cycle interval with
10.24 kHz sample rate. If the signaling voltage corresponds to the frequency of a FFT bin
within 1 % (referred to the bin spacing), only this bin is used. Otherwise, the rms values
of four neighboring FFT bins are added, giving the rms value of the signaling frequency.
200 ms and 3 s aggregations are available.
Unbalance, Overdeviation, Underdeviation
Unbalance
The unbalance (imbalance) is derived from the symmetrical components as per IEC
61000-4-30 class A section 5.7.1. based on the 10/12 cycle values of the voltage
fundamentals. The symmetrical components are calculated as:
V
1
=
V
V
P
1
3
1
=
V
V
N
3
V
, V
Z
V
, V
1
ϕ
, ϕ
12
3-22
1
(
ϕ
=
+
V
V
*
cos
Z
1
2
3
(
)
ϕ
+
+
ο
V
*
cos
120
2
12
(
ϕ
ο
+
+
V
*
cos
240
1
2
12
, V
rms values of zero, positive, and negative system
P
N
, V
rms values of the fundamentals of the phase voltages
2
3
phase angles between phases 1 and 2, phases 1 and 3
13
(nominal: -120° and -240°)
) (
ϕ
2
+
+
V
*
cos
V
12
3
13
(
)
ϕ
+
+
ο
V
*
cos
240
3
13
)
(
)
ϕ
ο
+
+
V
*
cos
120
2
13
ϕ
ϕ
+
*
sin
V
*
sin
2
12
3
13
(
)
2
ϕ
+
+
ο
V
*
sin
120
2
12
(
2
ϕ
ο
+
+
V
*
sin
240
2
12
)
2
(
)
2
ϕ
+
+
ο
V
*
sin
240
3
13
)
(
)
ϕ
ο
+
+
V
*
sin
120
3
13
2
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