Fuji Electric FRENIC-Ace series - 2 ] Calculation of Harmonic Current

Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving High
Voltage or Special High Voltage (General-purpose inverter)
Appendix-14
(2) Values of “Ki (conversion factor)”
Depending on whether an optional ACR (AC reactor) or DCR (DC reactor) is used, apply the appropriate
conversion factor specified in the appendix to the guideline. The values of the conversion factor are listed in Table
B-3.
Table B-3 “Conversion Factors Ki” for General-purpose Inverters Determined by Reactors
Circuit
category
Circuit type
Conversion factor
Ki
Main applications
3
Three-phase bridge
(Capacitor smoothing)
w/o a reactor K31=3.4
 General-purpose inverter
w/- a reactor (ACR) K32=1.8
 Elevator
w/- a reactor (DCR) K33=1.8
 Cold air refrigerating machine
w/- reactors (ACR and DCR) K34=1.4
 Other equipment in general
Some models are equipped with a reactor as a standard accessory.
[ 2 ] Calculation of Harmonic Current
(1) Value of “input fundamental current”
 When you calculate the amount of harmonics according to Table 2 in Appendix of the Guideline, you have to
previously know the input fundamental current.
 Apply the appropriate value shown in Table B-4 based on the kW rating of the motor, irrespective of the inverter
type or whether a reactor is used.
If the input voltage is different, calculate the input fundamental current in inverse proportion to the
voltage.
Table B-4
“Input Fundamental Currents” of General-purpose Inverters Determined by the Applicable Motor Ratings
Applicable motor rating (kW)
0.4
0.75
1.5
2.2
3.7
5.5
7.5
11
15
18.5
Input fundamental
current (A)
200V
1.62
2.74
5.50
7.92
13.0
19.1
25.6
36.9
49.8
61.4
400V
0.81
1.37
2.75
3.96
6.50
9.55
12.8
18.5
24.9
30.7
6.6 kV converted value (mA) 49 83 167 240 394 579 776 1121 1509 1860
Applicable motor rating (kW) 22 30 37 45 55 75 90 110 132 160
Input fundamental
current (A)
200V
73.1
98.0
121
147
180
245
293
357
400V 36.6 49.0 60.4 73.5 89.9 123 147 179 216 258
6.6 kV converted value (mA)
2220
2970
73.5
4450
5450
7450
8910
10850
13090
15640
Applicable motor rating (kW)
200
220
250
280
315
355
400
450
500
630
Input fundamental
current (A)
200V
400V
323
355
403
450
506
571
643
723
804
1013
6.6 kV converted value (mA)
19580
21500
24400
27300
30700
34600
39000
43800
48700
61400
(2) Calculation of harmonic current
Usually, calculate the harmonic current according to the Sub-table 3 “Three-phase bridge rectifier with the
smoothing capacitor” in Table 2 of the Guideline’s Appendix. Table B-5 lists the contents of the Sub-table 3.
Table B-5 Generated Harmonic Current (%), 3-phase Bridge Rectifier (Capacitor Smoothing)
Degree
5th
7th
11th
13th
17th
19th
23rd
25th
w/o a reactor
65
41
8.5
7.7
4.3
3.1
2.6
1.8
w/- a reactor (ACR)
38
14.5
7.4
3.4
3.2
1.9
1.7
1.3
w/- a reactor (DCR)
30
13
8.4
5.0
4.7
3.2
3.0
2.2
w/- reactors (ACR and DCR) 28 9.1 7.2 4.1 3.2 2.4 1.6 1.4
 ACR: 3%
 DCR: Accumulated energy equal to 0.08 to 0.15 ms (100% load conversion)
 Smoothing capacitor: Accumulated energy equal to 15 to 30 ms (100% load conversion)
 Load: 100%
100
(%) currentharmonic nth Generated
(A) current lFundamenta(A) currentharmonic nth ×=