L&T Electrical & Automation OMEGA, Руководство пользователя

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49
Matrix
Protection and Control Units
C r e s t F a c t o r ( C F ) :
T h e C r e s t F a c t o r o f a p o w e r s o u r c e i s d e f i n e d a s :
I / I
p e a k R M S
Crest Factor is an important parameter to understand when trying to take accurate measurements of low frequency
signals.
CF for sine wave = 1.414
However, the Crest Factor for a non-sinusoidal current waveform can differ dramatically for loads that are not power
factor corrected, such as a switching power supply or lamp ballast, which gives a current waveform that is short in
duration but high in amplitude.
CF specified in various communication devices QPSK, QAM, WCDMA should be maintained in the system for reliable
communication.
Form Factor (FF):
The Form Factor of a power source is defined as
: I/ I
R M S a v g
FF for pure sine wave = 1.11
FF remains independent of the amplitude of the waveform and will remain same for a particular waveform.
P e a k F a c t o r ( P F ) :
T h e P e a k F a c t o r o f a p o w e r s o u r c e i s d e f i n e d a s
: I / I
p e a k a v g
All the above power quality indicators are inbuilt in MTX 4.5
THD PROFILING
100
80
60
40
20
0
23:59
Time
THD Profile - B
23:59
10
30
50
70
90
%
07:59 15:59 23:29
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50
Matrix
Modules Architecture