MCP3909RD-3PH1 Microchip Technology, MCP3909RD-3PH1 Datasheet - Page 94
![REF DESIGN MCP3909 3PH ENGY MTR](/photos/9/7/90784/mcp3909rd-3ph1_sml.jpg)
MCP3909RD-3PH1
Manufacturer Part Number
MCP3909RD-3PH1
Description
REF DESIGN MCP3909 3PH ENGY MTR
Manufacturer
Microchip Technology
Datasheets
1.MCP3909T-ISS.pdf
(44 pages)
2.MCP3909T-ISS.pdf
(104 pages)
3.MCP3909RD-3PH3.pdf
(88 pages)
Specifications of MCP3909RD-3PH1
Main Purpose
Power Management, Energy/Power Meter
Embedded
No
Utilized Ic / Part
MCP3909, PIC18F2520, PIC18F4550
Primary Attributes
3-Ph, 220 VAC, In Case, LCD, USB, GUI
Secondary Attributes
Opto-Isolated Interface for Safety
Operating Voltage
220 V
Operating Current
5 A
Description/function
Energy Meter
For Use With/related Products
MCP3909
Lead Free Status / RoHS Status
Not applicable / Not applicable
- Current page: 94 of 104
- Download datasheet (2Mb)
MCP3909 / dsPIC33F 3-Phase Energy Meter Reference Design
C.12 HARMONIC COMPONENTS OF CURRENT, VOLTAGE AND TOTAL
DS51723A-page 94
HARMONIC DISTORTION
In Section C.3 “The Harmonic Analysis Algorithm Of Quasi-synchronous Sam-
pling”, we discussed the measuring of current and voltage signals for each order of
harmonics. 3 parameters are used to show to what extent a distorted wave deviates
from a sine wave. They are: harmonic content, total distortion and harmonic ratio of the
k-th harmonic. The term harmonic content means the root of square of effective values
for all harmonics, which is defined as:
EQUATION C-60:
The total voltage distortion ratio of harmonics is the ratio of harmonic content to the
fundamental in percentage, which is defined as:
EQUATION C-61:
The k-th harmonic ratio for voltage is the ratio of the k-th harmonic to the fundamental
in percentage, defined as:
EQUATION C-62:
Similarly, harmonics of each order for the current and total distortion ratio can be sorted
out.
THD
U
=
THD
U
-------
U
U
H
H
I
Uk
×
=
100%
=
k
U
------
U
∑
N
=
1
k
2
×
k
U
∑
100%
N
=
k
2
2
(
THD
Uk
)
© 2009 Microchip Technology Inc.
2
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