Appendix B Japanese Guideline for Suppressing Harmonics by Customers Receiving High
Voltage or Special High Voltage (General-purpose Inverters)
Appendix-13
Appendix B Japanese Guideline for Suppressing Harmonics by Customers
Receiving High Voltage or Special High Voltage (General-
purpose Inverters)
Agency of Natural Resource and Energy of Japan published the following two guidelines for suppressing harmonic
noise in September 30, 1994.
(1) "Guideline to Reduce Harmonic Emissions Caused by Electrical and Electronic Equipment for Household and
General Use"
(2) "Guideline for Suppressing Harmonics by Customers Receiving High Voltage or Special High Voltage"
These guidelines were enacted based on the assumption that the use of electronic devices generating harmonic
current would continue to rise in the future, and that they would lead to the prevention of harmonic interference at
devices connected to systems by applying regulations beforehand. These guidelines apply to all electrical and
electronic devices used with a commercial power supply and which generate harmonic current, however, the
following explanation applies only to "general-purpose inverters".
Refer to “Japan Electrical Manufacturers’ Association JEM-TR201” for details on how to calculate harmonic
current.
B.1 Application of general-purpose inverters
[ 1 ] Application for Other Than Special Customers
From January 2004, general-purpose inverters (input current of 20A or less) were excluded from the "Guideline to
Reduce Harmonic Emissions Caused by Electrical and Electronic Equipment for Household and General Use"
(established September, 1994) enacted by the Ministry of Economy, Trade and Industry. Customers for whom the
"Guideline for Suppressing Harmonics by Customers Receiving High Voltage or Special High Voltage" does not
apply are recommended to connect the "DC reactor" indicated in the catalog or this manual to the inverter as in the
past.
[ 2 ] Application for "Guideline for Suppressing Harmonics by Customers Receiving
High Voltage or Special High Voltage"
All customers receiving high voltage or special high voltage fall under the scope of the "Guideline for Suppressing
Harmonics by Customers Receiving High Voltage or Special High Voltage". Devices generating harmonic current
such as "general-purpose inverters" are not regulated directly, but for each customer using a power supply. It is
necessary to calculate such values as the amount of harmonic current generated by individual devices.
(1) Regulation scope
Generally speaking, regulations apply if the following two conditions are satisfied.
• The device is receiving high or extra-high voltage.
• Converter load "equivalent capacity" exceeds the standard value (50kVA when receiving 6.6 kV) for the receiving
voltage.
If calculating "equivalent capacity" in accordance with the guidelines, a supplementary description is provided in
"B.2 [ 1 ] Calculation of equivalent capacity (Pi)".
(2) R egulation method
Regulate the size (calculated value) of the harmonic current flowing from the customer's power receipt point to the
system. Regulation values are proportional to contracted demand. Guideline regulation values are shown in Table
B.1-1.
If calculating "harmonic current" in accordance with the guidelines, a supplementary description is provided in "B.2
Complying with "Guideline for Suppressing Harmonics by Customers Receiving High Voltage or Special High
Voltage"".
Table B.1-1 Harmonic outflow current upper limit per 1kW of contracted demand (mA/kW)
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