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INSTALLATION AND WIRING
29
2.3.2 Japanese 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.
1) "Harmonic suppression guideline for household appliances and general-purpose products"
This guideline was issued by Ministry of Economy, Trade and Industry (formerly Ministry of International
Trade and Industry) in September, 1994 and applies to 200V class inverters of 3.7kW (5HP) and less. By
installing the FR-BEL or FR-BAL power factor improving reactor, inverters comply with the “harmonic
suppression techniques for transistorized inverters (input current 20A or less)” established by the Japan
Electrical Manufacturers
′
Association. Therefore install the optional reactor for the 200V class, 3.7kW
(5HP) or less inverter.
2) "Harmonic suppression 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 are exceeded, this guideline requires that consumer to take certain suppression
measures.
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
(
1
)
Application of the harmonic suppression guideline for specific consumers
New installation/addition/renewal of equipment
Sum of equivalent capacities
Over reference capacity
Is outgoing harmonic cur-
rent equal to or lower than
maximum value
?
Over maximum value
Not more than
maximum value
Not more than
reference capacity
Calculation of equivalent capacity sum
Calculation of outgoing harmomic current
Harmomic suppression technique is required.
Harmomic suppression technique is not required.
Table 2 Conversion Factors for FR-F500 Series
Class Circuit Type Conversion Factor Ki
Without reactor K31 = 3.4
With reactor (AC side) K32 = 1.8
With reactor (DC side) K33 = 1.8
3
3-phase bridge
(Capacitor-smoothed)
With reactors (AC, DC sides) K34 = 1.4
5 Self-exciting 3-phase bridge When high power factor converter is used K5 = 0