CET Electric Technology
33
4.3.2.4 Crest Factor
Crest Factor is defined as the Peak to Average Ratio (PAR), and its calculation is illustrated below:
where
|X|
peak
= Peak amplitude of the waveform
X
rms
= RMS value
The following table illustrates the available Voltage and Current Harmonics measurements on the PMC-
33M-A.
Table 4-5 Harmonic Measurements
4.3.3 Unbalance
The PMC-33M-A provides Voltage and Current Unbalance measurements. The calculation method of
Voltage and Current Unbalances are listed below:
Voltage Unbalance =
Current Unbalance =
where
V1, V2 are the Positive and Negative Sequence Components for Voltage, respectively.
and
I1, I2 are the Positive and Negative Sequence Components for Current, respectively.
4.3.4 Symmetrical Components
The PMC-33M-A provides the Voltage and Current Symmetrical Components measurements, which are
only available via communication.
Table 4-6 Symmetrical Parameters
4.4 Setpoints
The PMC-33M-A comes standard with 9 user programmable setpoints which provide extensive control
by allowing a user to initiate an action in response to a specific condition. Typical setpoint applications
include alarming, fault detection and power quality monitoring.
To Next Page
Loading...
Need help?
General