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Harmonic contents for 12-phase rectification (values of the fundamental current is 100%)
Reactor
Used (DC side)
1.4
Calculation of equivalent capacity P0 of harmonic generating equipment
"Equivalent capacity" is the capacity of a 6-pulse converter converted from the capacity of consumer's harmonic generating
equipment and is calculated by the following equation. If the sum of equivalent capacities is higher than the limit (refer to
65), harmonics must be calculated by the equation in next subheading.
P0 = Σ (Ki × Pi) [kVA]
Ki: Conversion factor (Refer to
Pi: Rated capacity of harmonic generating equipment
i: Number indicating the conversion circuit type
Calculation of outgoing harmonic current
Outgoing harmonic current = fundamental wave current (value converted from received power voltage) × operation ratio ×
harmonic content
• Operation ratio: actual load factor × operation time ratio during 30 minutes
• Harmonic content: Refer to
Rated capacities and outgoing harmonic currents of inverter-driven motors
Fundamental
wave current
Applicable
(A)
motor (kW)
400 V
75
123
90
147
110
179
132
216
160
258
220
355
250
403
280
450
315
506
355
571
400
643
450
723
500
804
560
900
630
1013
Determining if a countermeasure is required
A countermeasure for harmonics is required if the following condition is satisfied: outgoing harmonic current > maximum value
per 1 kW contract power × contract power.
Harmonic suppression techniques
66
3. PRECAUTIONS FOR USE OF THE CONVERTER UNIT
3.2 Power supply harmonics
5th
7th
11th
1.5
7.2
page
65.)
*1
page
65.
Fundamental
wave current
Rated
converted
capacity
from 6.6 kV
(kVA)
(mA)
7455
87.2
8909
104
10848
127
13091
153
15636
183
21515
252
24424
286
27273
319
30667
359
34606
405
38970
456
43818
512
48727
570
54545
638
61394
718
13th
17th
4.1
0.8
*1
Rated capacity: Determined by the capacity of the applied
motor and found in the following table. The rated capacity
used here is used to calculate the generated harmonic
[kVA]
amount and is different from the power supply capacity
required for actual inverter drive.
Outgoing harmonic current converted from 6.6 kV (mA) (with a DC
reactor, 100% operation ratio)
5th
7th
11th
2237
969
626
2673
1158
748
3254
1410
911
3927
1702
1100
4691
2033
1313
6455
2797
1807
7327
3175
2052
8182
3545
2291
9200
3987
2576
10382
4499
2907
11691
5066
3274
13146
5696
3681
14618
6335
4093
16364
7091
4582
18418
7981
5157
19th
23rd
0.7
1.6
1.4
13th
17th
19th
373
350
239
445
419
285
542
510
347
655
615
419
782
735
500
1076
1011
688
1221
1148
782
1364
1282
873
1533
1441
981
1730
1627
1107
1949
1832
1247
2191
2060
1402
2436
2290
1559
2727
2564
1746
3070
2886
1965
25th
page
23rd
25th
224
164
267
196
325
239
393
288
469
344
645
473
733
537
818
600
920
675
1038
761
1169
857
1315
964
1462
1072
1636
1200
1842
1351
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