Accura 3300E User Guide
Chapter 4 Measurements
ⓒ
2015 Rootech Inc. All Rights Reserved
Page 69
Instantaneous
Waveform
2 cycles of voltage waveforms(32-
samples/cycle)
▲
V
2 cycles of current waveforms(32-
samples/cycle)
▲
A
1
THD[Total Harmonic Distortion], Voltage THD :
√∑
𝑉
𝑘
2
31
𝑘=2
𝑉
1
, Current THD :
√∑
𝐼
𝑘
2
31
𝑘=2
𝐼
1
2
TDD[Total Demand Distortion] :
√∑
𝐼
𝑘
2
31
𝑘=2
𝐼
𝐿
where
L
I
can be selected from the rated current[default] and peak demand current [only by communication].
3
Crest factor :
𝑉
𝑝𝑒𝑎𝑘
𝑉
𝑟𝑚𝑠
4
K-factor :
∑
(𝑘 𝐼
𝑘
)
2
31
𝑘=1
∑
𝐼
𝑘
2
31
𝑘=1
5
Residual Voltage is the RMS value of the waveform obtained by adding 3 phase voltages in the time domain.
6
Residual Current is three times the value of zero sequence current for fundamental component. If there is no
harmonics, the residual current is the same value of the RMS current of the waveform obtained by adding 3
phase currents in the time domain.
Measurement Event Parameters
Measurement event parameters provided by communication and Accura 3300E are shown in the
table below. In the EVENT Log mode,
“
Event
”
segment at the top bar is turned on and up to the
last 50 event logs can be checked.
▣
Shown on Accura 3300E
’s screen and provided via communication
▲
Available only via communication
Event Item
Phase
Total
Start Event
End Event
Start Value
End Value
Phase Open
▣
-
-
Fuse Fail
▣
-
-
Blackout
▣
-
Over-temperature
▣
▣
▣
Summary of Contents for ACCURA 3300E
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