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1) Calculation of equivalent capacity P0 of harmonic generating equipment
The “equivalent capacity” is the capacity of a 6-pulse converter converted from the capacity of a
consumer’s harmonic generating equipment and is calculated with the following equation. If the sum of
equivalent capacities is higher than the limit in Table 3, harmonics must be calculated in the following
procedure:
2) Calculation of outgoing harmonic current
• Operation ratio: Operation ratio = actual load factor × operation tim ratio during 30 minutes
• Harmonic content: Found in Table 4.
Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Note:When a motor of 3.7kW or less capacity is driven by a transistorized inverter of more than 3.7kW.
For example, when a 3.7kW or less motor is driven by a 5.5kW transistorized inverter, the
transistorized inverter is not the target of the household appliances/general-purpose products
guideline, but because they must be included in the calculation of the harmonic current of the
guideline, the fundamental wave input currents are indicated.
3) Harmonic suppression technique requirement
If the outgoing harmonic current is higher than the maximum value per 1kW contract power ×
contract
power, a harmonic suppression technique is required.
P0 = (Ki×Pi) [kVA]
Ki: Conversion factor (refer to Table 2)
Pi: Rated capacity of harmonic
generating equipment* [kVA]
i: Number indicating the conversion
circuit type
* Rated capacity: Determined by the
capacity of the applied motor and found
in Table 5. It should be noted that the
rated capacity used here is used to
calculate generated harmonic amount
and is different from the power supply
capacity required for actual inverter drive.
Outgoing harmonic
current
=
fundamental wave current
(value converted from received power voltage)
×
operation
ratio
×
harmonic
content
Applied
Motor
(kW)
Rated
Current
[A]
Fundamental
Wave Current
Converted from
6.6kV (mA)
Rated
Capacity
(kVA)
Fundamental Wave Current Converted from 6.6kV(mA)
(No reactor, 100% operation ratio)
200V 400V 5th 7th 11th 13th 17th 19th 23rd 25th
0.4
1.61
(Note)
0.81 49 0.57 31.85 20.09 4.165 3.773 2.107 1.519 1.274 0.882
0.75
2.74
(Note)
1.37 83 0.97 53.95 34.03 7.055 6.391 3.569 2.573 2.158 1.494
1.5
5.50
(Note)
2.75 167 1.95 108.6 68.47 14.20 12.86 7.181 5.177 4.342 3.006
2.2
7.93
(Note)
3.96 240 2.81 156.0 98.40 20.40 18.48 10.32 7.440 6.240 4.320
3.7
13.0
(Note)
6.50 394 4.61 257.1 161.5 33.49 30.34 16.94 12.21 10.24 7.092
5.5 19.1 9.55 579 6.77 376.1 237.4 49.22 44.58 24.90 17.95 15.05 10.42
7.5 25.6 12.8 776 9.07 504.4 318.2 65.96 59.75 33.37 24.06 20.18 13.97
11 36.9 18.5 1121 13.1 728.7 459.6 95.29 86.32 48.20 34.75 29.15 20.18
15 49.8 24.9 1509 17.6 980.9 618.7 128.3 116.2 64.89 46.78 39.24 27.16
18.5 61.4 30.7 1860 21.8 1209 762.6 158.1 143.2 79.98 57.66 48.36 33.48
22 73.1 36.6 2220 25.9 1443 910.2 188.7 170.9 95.46 68.82 57.72 39.96
30 98.0 49.0 2970 34.7 1931 1218 252.5 228.7 127.7 92.07 77.22 53.46
37 121 60.4 3660 42.8 2379 1501 311.1 281.8 157.4 113.5 95.16 65.88
45 147 73.5 4450 52.1 2893 1825 378.3 342.7 191.4 138.0 115.7 80.10
55 180 89.9 5450 63.7 3543 2235 463.3 419.7 234.4 169.0 141.7 98.10
Σ