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Design
As described below, the result is multiplied by the maximum equipment operating rate to reduce
the current.
The harmonic currents emitted by all devices at the rated operating status are totaled and then
multiplied by the maximum equipment operating rate to calculate the harmonic emission current.
The maximum equipment operating rate is the ratio of the total capacity of the devices emitting
harmonic current to the maximum capacity of the equipment when operating. The maximum ca-
pacity of the equipment when operating is the average value over a 30-minute period.
3G3JE Harmonic Current Countermeasures
■
●
AC Reactors
AC reactors are used to suppress harmonic current. Using an AC reactor will reduce the emission
rate of harmonic current as shown in the following table to improve the power rate on the Inverter's
input side. The AC reactor functions to suppress sudden currents.
●
Effect of AC Reactor
Harmonic
countermeasure
5th
None
65
(only Inverter)
AC Reactor
38
Three-phase
200 to 230 VAC
2-36
Harmonic current rate for harmonic numbers (%)
7th
11th
41
8.5
7.7
14.5
7.4
3.4
AC Reactor
MCCB
(optional)
13th
17th
19th
4.3
3.1
3.2
1.9
B1
B2
R/L1
U/T1
S/L2
V/T2
T/L3
W/T3
3G3JE
Inverter
Chapter 2
23rd
25th
2.6
1.8
1.7
1.3
M
3~
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