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Main circuit terminals
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 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 with the following procedure:
2) 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: Found in Table 4.
Table 4 Harmonic Contents (Values of the fundamental current of 100%)
Reactor 5th 7th 11th 13th 17th 19th 23rd 25th
Not used 65 41 8.5 7.7 4.3 3.1 2.6 1.8
Used (AC side) 38 14.5 7.4 3.4 3.2 1.9 1.7 1.3
Used (DC side)
or with filter
pack
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=Σ (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 a generated
harmonic amount and is different
from the power supply capacity
required for actual inverter drive.