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Power supply harmonics
68
PRECAUTIONS FOR USE OF THE INVERTER
3.2.2 Harmonic Suppression Guidelines in Japan
Harmonic currents flow from the inverter to a power receiving point via a power transformer. The Harmonic Suppression
Guidelines was established to protect other consumers from these outgoing harmonic currents.
The three-phase 200 V input specifications 3.7 kW or lower were previously covered by "the Harmonic Suppression Guidelines for
Household Appliances and General-purpose Products" and other models were covered by "the Harmonic Suppression Guidelines for
Consumers Who Receive High Voltage or Special High Voltage". However, the transistorized inverter has been excluded from the target
products covered by "the Harmonic Suppression Guidelines for Household Appliances and General-purpose Products" in January 2004 and
"the Harmonic Suppression Guideline for Household Appliances and General-purpose Products" was repealed on September 6, 2004.
All capacity and all models of general-purpose inverter used by specific consumers are now covered by "the Harmonic
Suppression Guidelines for Consumers Who Receive High Voltage or Special High Voltage" (hereinafter referred to as "the
Specific Consumer Guidelines").
• "Specific Consumer Guidelines"
This guideline sets forth the maximum harmonic currents outgoing from a high-voltage or especially high-voltage receiving
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.
• Maximum Values of Outgoing Harmonic Currents per 1 kW Contract Power
Application of the specific consumer guidelines
• Conversion factors for FR-A800 series
• Equivalent Capacity Limits
• Harmonic content (Values of the fundamental current is 100%)
The converter unit (FR-CC2) is equipped with the DC reactor on its DC side.
Received power
voltage
5th 7th 11th 13th 17th 19th 23rd
Over
23rd
6.6 kV 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 0.860.550.460.350.320.260.24
Classification Circuit type Conversion coefficient Ki
3
Three-phase bridge
(Capacitor smoothing)
With reactor (DC side)
K33 = 1.8
With reactors (AC, DC sides)
K34 = 1.4
5
Self-excitation three-phase bridge When a high power factor converter is used K5 = 0
Received power voltage Reference capacity
6.6 kV 50 kVA
22/33 kV 300 kVA
66 kV or more 2000 kVA
reactor 5th 7th 11th 13th 17th 19th 23rd 25th
Used (DC side) 30 13 8.4 5.0 4.7 3.2 3.0 2.2
Used (AC, DC sides)
28 9.1 7.2 4.1 3.2 2.4 1.6 1.4
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equivalent
capacity total
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
limit?
Harmonic suppression
measures unnecessary
Harmonic suppression
measures necessary
Equal to or less
than upper limit
More than upper limit
Above reference
capacity
Equal to or less
than reference
capacity