MI 2792 PowerQ4 Plus
Theory and internal operation
116
P
+
= 0
P
-
= P
x
Q
i
+
= 0
Q
i
-
= 0
Q
c
+
= 0
Q
c
-
= Q
x
Pf
i
+
= na
Pf
i
-
= na
Pf
c
+
= na
Pf
c
-
= Pf
x
ePpos = 0
ePneg = P
x
* t
eQpos = Q
x
* t
eQneg = 0
P
+
= 0
P
-
= P
x
Q
i
+
= 0
Q
i
-
= Q
x
Q
c
+
= 0
Q
c
-
= 0
Pf
i
+
= na
Pf
i
-
= Pf
x
Pf
c
+
= na
Pf
c
-
= na
ePpos = 0
ePneg = P
x
* t
eQpos = 0
eQneg = Q
x
* t
P
+
= P
x
P
-
= 0
Q
i
+
= Q
x
Q
i
-
= 0
Q
c
+
= 0
Q
c
-
= 0
Pf
i
+
= Pf
x
Pf
i
-
= na
Pf
c
+
= na
Pf
c
-
= na
ePpos = P
x
* t
ePneg = 0
eQpos = Q
x
* t
eQneg = 0
P
+
= P
x
P
-
= 0
Q
i
+
= 0
Q
i
-
= 0
Q
c
+
= Q
x
Q
c
-
= 0
Pf
i
+
= na
Pf
i
-
= na
Pf
c
+
= Pf
x
Pf
c
-
= na
ePpos = P
x
* t
ePneg = 0
eQpos = 0
eQneg = Q
x
* t
GENERATOR MODE
TYPE
Capacitive generator
MOTOR MODE
TYPE
Inductive load
GENERATOR MODE
TYPE
Inductive generator
MOTOR MODE
TYPE
Capacitive load
90'
270'
0'
180'
Figure 5.10: Motor/generator and inductive/capacitive phase/polarity diagram
5.1.15 Waveform snapshoot
During measurement campaign PowerQ4 Plus has the ability to take waveform
snapshot. This is particularly useful for storing temporary characteristics or network
behavior. Snapshot stores all network signatures and samples of 10 cycles. Using
MEMORY LIST function (see 3.10) or with PowerView v2.0 software, user can observe
stored data.
5.1.16 Waveform record
Waveform record is consisted of a configurable number of consecutive Waveform
snapshoots. Waveform recorder starts when the preset trigger occurs. Storage buffer is
divided into pre-trigger and post-trigger buffers. Pre and post-trigger buffers are
composed of waveform snapshoots taken before and after trigger occurrence. Several
trigger sources are possible:
Manual trigger - user manually triggers waveform recording.
Voltage events – instrument start waveform recorder when voltage event occur.
Alarms – instrument start waveform recorder when alarm from alarm list is
detected.
