Mitsubishi Electric FR-A700 Technical Manual page 480

Harmonic reduction guideline for consumers who receive high voltage or special high voltage
1. Purpose
This guideline sets forth technological requirements to reduce harmonic currents generated when electric
equipments are used by consumers who receive power of high voltage or specially high voltage (hereinafter
referred to as the "specific consumers") from commercial power systems (hereinafter referred to as the "system"),
after observing the technological standards in accordance with the Electricity Enterprises Act and taking into
account the harmonic environment target levels of the systems.
2.Scope
(1) This guideline applies to the specific consumers whose sum of "equivalent capacities" of harmonic
generating equipment falls within either of the following:
1) Consumers who receive power from high voltage systems
6.6kV system
2) Consumers who receive power from specially high voltage systems
22kV or 33kV system
66kV or more system
(2) Equipment covered by (1) shall be all harmonic generating equipment with the exception of the
equipment covered by the "Harmonic reduction guideline for household appliances and general-
purpose products".
(3) Any new harmonic generating equipment installed or added/renewed is covered by this guideline when
the sum of equivalent capacities fall within the value indicated above in (1) after installation, addition or
renewal.
3.Reduction of harmonic currents
The maximum outgoing harmonic current values at a specific consumer's receiving shall be values by multiplying
the maximum outgoing harmonic current values per 1kW of contract power indicated in the table on the next page
by the contract power of the corresponding consumer. If any of these values is exceeded, the necessary
countermeasure must be taken.
4.Calculation of outgoing harmonic currents
Outgoing harmonic currents at a receiving point shall be as follows:
(1) Only the magnitude of an outgoing harmonic current is calculated and the 40th or less degree shall be
covered by this guideline.
(2) An outgoing harmonic current at a receiving point is found by summing up harmonic currents
generated in the rated operating status of individual harmonic generating equipment and multiplying
the sum by the maximum operation ratio of the harmonic generating equipment. If the consumer has a
facility to reduce harmonic currents, its effect may be taken into consideration.
Overview of the guideline (excerpt)
50kVA or more
300kVA or more
2000kVA or more
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