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Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving High
Voltage or Special High Voltage (General-purpose inverter)
Appendix-13
APPEN
DI
CES
(3) When the regulation applied
The guideline has been applied.
The estimation for “Voltage distortion factor” required as the indispensable conditions when entering into the
consumer’s contract of electric power is already expired.
B.2 Compliance to the harmonic suppression for customers receiving high voltage
or special high voltage
When calculating the required matters related to inverters according to the guideline, follow the terms listed below.
The following descriptions are based on “Technical document for suppressing harmonics” (JEAG 9702-1995)
published by the Japan Electrical Manufacturer’s Association (JEMA).
[ 1 ] Calculation of equivalent capacity (Pi)
The equivalent capacity (Pi) may be calculated using the equation of (input rated capacity) x (conversion factor).
However, catalogs of conventional inverters do not contain input rated capacities, so a description of the input
rated capacity is shown below:
(1) “Inverter rated capacity” corresponding to “Pi”

In the guideline, the conversion factor of a 6-pulse converter is used as reference conversion factor 1. It is,
therefore, necessary to express the rated input capacity of inverters in a value including harmonic component
current equivalent to conversion factor 1.

In particular, calculate the input fundamental current I
1
from the kW rating and efficiency of the motor and the
efficiency of the inverter as loads and then calculate:
Input rated capacity= √ 3 × (power voltage) × I
1
× 1.0228/1000 (kVA).
Then, calculate the input rated capacity as shown below: where 1.0228 is the 6-pulse converter’s value of
(effective current)/ (fundamental current).

When a general-purpose motor or inverter motor is used, the appropriate value shown in Table B-2 can be used.
Select a value based on the kW rating of the motor used, irrespective of the inverter type.
The input rated capacity shown above is for the dedicated use in the equation to calculate capacity of
the inverters, following the guideline. Note that the capacity cannot be applied to the reference for
selection of the equipment or wires to be used in the inverter input circuits.

For selection of capacity for the peripheral equipment, refer to the catalogs or technical documents issued
from their manufacturers.
Table B-2 “Input Rated Capacities” 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
Pi (kVA)
200V 0.57 0.97 1.95 2.81 4.61 6.77 9.07 13.1 17.6 21.8
400V 0.57 0.97 1.95 2.81 4.61 6.77 9.07 13.1 17.6 21.8
Applicable motor rating
(kW)
22 30 37 45 55 75 90 110 132 160
Pi (kVA)
200V 25.9 34.7 42.8 52.1 63.7 87.2 104 127
400V 25.9 34.7 42.8 52.1 63.7 87.2 104 127 153 183
Applicable motor rating
(kW)
200 220 250 280 315 355 400 450 500 630
Pi (kVA)
200V
400V 229 252 286 319 359 405 456 512 570 718