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1.6.7 Harmonic suppression guidelines
Harmonic currents flow from the inverter to a power receiving point via a power transformer. The harmonic
suppression guidelines were established to protect other consumers from these outgoing harmonic currents.
The three-phase 200V input specifications 3.7kW or less are previously covered by "Harmonic suppression
guideline for household appliances and general-purpose products" and other models are covered by "Harmonic
suppression guideline for consumers who receive high voltage or special high voltage". However, the general-
purpose inverter has been excluded from the target products covered by "Harmonic suppression guideline for
household appliances and general-purpose products" in January 2004. Later, this guideline was repealed on
September 6, 2004. All capacities of all models are now target products of "Harmonic suppression guideline for
consumers who receive high voltage or special high voltage" (hereinafter referred to as "guideline for specific
consumers").
"Guideline for specific consumers"
This guideline sets forth the maximum values of harmonic currents outgoing from a high-voltage or especially
high-voltage consumer who will install, add or renew harmonic generating equipment. If any of the maximum
values is exceeded, this guideline requires that consumer to take certain suppression measures.
(1) Application of the guideline for specific consumers
Table 1 Maximum Values of Outgoing Harmonic Currents per 1kW Contract Power
Received
Power Voltage
5th 7th 11th 13th 17th 19th 23rd Over 23rd
6.6kV 3.5 2.5 1.6 1.3 1.0 0.9 0.76 0.70
22kV 1.8 1.3 0.82 0.69 0.53 0.47 0.39 0.36
33kV 1.2 0.86 0.55 0.46 0.35 0.32 0.26 0.24
Table 2 Conversion Factors for FR-V500 Series
Class Circuit Type Conversion Factor Ki
3
Three-phase bridge
(Capacitor-smoothed)
Without reactor K31 = 3.4
With reactor (AC side) K32 = 1.8
With reactor (DC side) K33 = 1.8
With reactors (AC, DC sides) K34 = 1.4
5
Self-excitation three-phase
bridge
When high power factor converter is used K5 = 0
Table 3 Equivalent Capacity Limits
Received Power Voltage Reference Capacity
6.6kV 50kVA
22/33kV 300kVA
66kV or more 2000kVA
Harmonic suppression
technique is not required.
New installation/addition/
renewal of equipment
Calculation of equivalent
capacity sum
Not more than
reference capacity
Sum of
equivalent capacities
Over reference capacity
Calculation of outgoing
harmonic current
Is outgoing
harmonic current equal to
or lower than maximum
value?
Over maximum value
Harmonic suppression
technique is not required.
Not more than
maximum value