App. B Japanese Guideline for Suppressing Harmonics by Customers Receiving High Voltage or Special High Voltage
A-12
App. B Japanese Guideline for Suppressing Harmonics by Customers
Receiving High Voltage or Special High Voltage (General-purpose
Inverter)
Agency of Natural Resource and Energy of Japan published the following two guidelines for suppressing
harmonic noise on September 30 1994.
1. Guideline for suppressing harmonics in home electric and general-purpose appliances
2. Guideline for suppressing harmonics by customers receiving high voltage or special high voltage
Assuming that electronic devices generating high harmonics will be increasing, these guidelines are to
establish regulations for preventing high frequency noise interference on devices sharing the power source.
These guidelines should be applied to all devices that are used on the commercial power lines and
generate harmonic current. However, the following gives an overview of these guidelines by limiting the
target device to the "general-purpose inverter".
B.1 Application to general-purpose inverters
[1] Application to general-purpose inverters
General-purpose inverters (with input current of 20A or less) were the products of which were restricted by
the "Guideline for Suppressing Harmonics in Home Electric and General-purpose Appliances" (established
in September 1994) issued by the Ministry of Economy, Trade and Industry. The above restriction, however,
was lifted when the Guideline was revised in January 2004. For an inverter not regulated by the "Japanese
Guideline for Suppressing Harmonics by Customers Receiving High Voltage or Special High Voltage", we,
as before, recommend that you connect a DC reactor listed in the User's Manual to your inverter.
[2] For "Japanese Guideline for Suppressing Harmonics by Customers Receiving High Voltage or
Special High Voltage"
Unlike other guidelines, this guideline is not applied to the equipment itself such as a general-purpose
inverter, but is applied to each large-scale electric power consumer for total amount of harmonics. The
consumer should calculate the harmonics generated from each piece of equipment currently used on the
power source transformed and fed from the high or special high voltage source.
(1) Scope of regulation
In principle, the guideline applies to the customers that meet the following two conditions:
• The customer receives high voltage or special high voltage.
• The "equivalent capacity" of the converter load exceeds the standard value for the receiving voltage (50
kVA at a receiving voltage of 6.6 kV).
Appendix B.2 [1] "Calculation of equivalent capacity (Pi)" gives you some supplemental information with
regard to estimation for the equivalent capacity of an inverter according to the guideline.
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