Harmonic Parameters - Veesta World V-PM2000 Series User Manual

VP-2040 Enhanced IED
V-PM2000 Series, Veesta Power Measurement
Instructions & User's Manual
4.5

Harmonic Parameters

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The VP-2040 provides optional measurement of complete 31st
harmonic for voltage and current as well as their total harmonic
content (THD) and K factor of current.
The data of harmonics are given according to the percentage of
fundamental harmonics and have one digit after the decimal point.
That is to say, when the value of the fundamental harmonic is fixed at
1000, it is 100.0% of the effective value of the fundamental harmonic;
others are by analogy.
THD refers to the total of higher harmonics except fundamental
harmonics, and it is calculated according to the following formula:
THD 
The formula for calculating K factor is as follows:
i 
 
K 
i 
In above formulas:
i

: Harmonic order.
X

: Percentage of the effective value of each harmonic to
i
that of the fundamental harmonic.
n

: Highest harmonic order, which should be 31 here.
Notes:
o Each harmonic and THD can be checked through display or
communication.
o K factor can be checked only through communication.
Chapter 4 - Measuring Capability
i  n
2

X
i
i  2
n i  n
2
( i X )

i
1 i  1
2
X
i
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