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INSTALLATION AND WIRING
34
2.3.2 Japanese harmonic suppression guideline
Harmonic currents flow from the inverter to a power receiving point via a power
transformer. The harmonic suppression guideline was established to protect other
consumers from these outgoing harmonic currents.
1) "Harmonic suppression guideline for household appliances and general-purpose
products"
The "harmonic suppression guideline for household appliances and general-purpose
products" issued by ex-Ministry of International Trade and Industry (present Ministry
of Economy, Trade and Industry) in September, 1994 applies to the 3.7K and less
models. By installing the FR-BEL or FR-BAL power factor improving reactor, inverters
comply with the "haramonic suppression techniques for transistorized inverters (input
current 20A or less)" established by the Japan Electrical Manufacturers
′
Association.
Therefore, install the optional reactor for the 3.7kW 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 specially 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.
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
22 kV 1.8 1.3 0.82 0.69 0.53 0.47 0.39 0.36
33 kV 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
Not more than
reference capacity
New installation/addition/
renewal of equipment
Calculation of equivalent
capacity sum
Sum of equivalent
capacities
Over reference
capacity
Calculation of outgoing
harmonic current
Is outgoing harmonic
current equal to or lower
than maximum value?
Not more than
maximum value
Harmonic suppression
technique is not required.
Over maximum value
Harmonic suppression
technique is required.
2