Power supply harmonics
84
PRECAUTIONS FOR USE OF THE INVERTER
• Harmonic content (Values of the fundamental current is 100%)
• 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
page 83), harmonics must be calculated with the following procedure:
• Calculation of outgoing harmonic current
Outgoing harmonic current = fundamental wave current (value converted from received power voltage)
operation ratio
harmonic content
• Operation ratio: Operation ratio = actual load factor operation time ratio during 30 minutes
• Harmonic content: Refer to page 84.
• Rated capacities and outgoing harmonic currents of inverter-driven motors
Reactor 5th 7th 11th 13th 17th 19th 23rd 25th
Used (DC side) 30 13 8.4 5.0 4.7 3.2 3.0 2.2
Used (AC, DC sides) 28 9.1 7.2 4.1 3.2 2.4 1.6 1.4
P0 = ∑ (Ki Pi) [kVA]
Rated capacity: Determined by the capacity of the
applied motor and found in Table 5. The rated
capacity used here is used to calculate the generated
harmonic amount and is different from the power
supply capacity required for actual inverter drive.
Ki: Conversion coefficient (Refer to page 83)
Pi: Rated capacity of harmonic generating equipment
[kVA]
i: Number indicating the conversion circuit type
Applicable
motor (kW)
Fundamental
wave current
(A)
Fundamental
wave current
converted
from 6.6 kV
(mA)
Rated
capacity
(kVA)
Outgoing harmonic current converted from 6.6 kV (mA)
(With a DC reactor, 100% operation ratio)
400 V 5th 7th 11th 13th 17th 19th 23rd 25th
0.4 0.81 49 0.57 14.7 6.37 4.116 2.45 2.303 1.568 1.47 1.078
0.75 1.37 83 0.97 24.9 10.79 6.972 4.15 3.901 2.656 2.49 1.826
1.5 2.75 167 1.95 50.1 21.71 14.03 8.35 7.849 5.344 5.01 3.674
2.2 3.96 240 2.81 72 31.20 20.16 12 11.28 7.68 7.2 5.28
3.7 6.50 394 4.61 118.2 51.22 33.10 19.7 18.52 12.61 11.82 8.67
5.5 9.55 579 6.77 173.7 75.27 48.64 28.95 27.21 18.53 17.37 12.74
7.5 12.8 776 9.07 232.8 100.9 65.18 38.8 36.47 24.83 23.28 17.07
11 18.5 1121 13.1 336.3 145.7 94.16 56.05 52.69 35.87 33.63 24.66
15 24.9 1509 17.6 452.7 196.2 126.8 75.45 70.92 48.29 45.27 33.2
18.5 30.7 1860 21.8 558 241.8 156.2 93 87.42 59.52 55.8 40.92
22 36.6 2220 25.9 666 288.6 186.5 111 104.3 71.04 66.6 48.84
30 49.0 2970 34.7 891 386.1 249.5 148.5 139.6 95.04 89.1 65.34
37 60.4 3660 42.8 1098 475.8 307.4 183 172 117.1 109.8 80.52
45 73.5 4450 52.1 1335 578.5 373.8 222.5 209.2 142.4 133.5 97.9
55 89.9 5450 63.7 1635 708.5 457.8 272.5 256.2 174.4 163.5 119.9
75 123 7455 87.2 2237 969.2 626.2 372.8 350.4 238.6 223.7 164
90 147 8909 104 2673 1158 748.4 445.5 418.7 285.1 267.3 196
110 179 10848 127 3254 1410 911.2 542.5 509.9 347.1 325.4 238.7
132 216 13091 153 3927 1702 1100 654.6 615.3 418.9 392.7 288
160 258 15636 183 4691 2033 1313 781.8 734.9 500.4 469.1 344
220 355 21515 252 6455 2797 1807 1076 1011 688.5 645.5 473.3
250 403 24424 286 7327 3175 2052 1221 1148 781.6 732.7 537.3
280 450 27273 319 8182 3545 2291 1364 1282 872.7 818.2 600
315 506 30667 359 9200 3987 2576 1533 1441 981.3 920 674.7
355 571 34606 405 10382 4499 2907 1730 1627 1107 1038 761.3
400 643 38970 456 11691 5066 3273 1949 1832 1247 1169 857.3
450 723 43818 512 13145 5696 3681 2191 2059 1402 1315 964
500 804 48727 570 14618 6335 4093 2436 2290 1559 1462 1072
560 900 54545 638 16363 7091 4582 2727 2564 1745 1636 1200
630 1013 61394 718 18418 7981 5157 3070 2886 1965 1842 1351
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