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3.1.4
Harmonic suppression guideline in Japan
Inverters have a converter section (rectifier circuit) and generate a harmonic current.
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 200V input specifications 3.7kW or less (single-phase 200V power input model 2.2kW or less, single-phase
100V power input model 0.75kW) are previously covered by "Harmonic Suppression Guidelines for Household Appliances
and General-purpose Products" and other models are covered by "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 "Harmonic Suppression Guidelines for Household Appliances and General-purpose Products" in
January 2004 and "Harmonic Suppression Guidelines 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repealed on September 6, 2004.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 covered by "Harmonic Suppression
Guidelines for Consumers Who Receive High Voltage or Special High Voltage" (hereinafter referred to as "Specific Consumer
Guidelines").
"Specific Consumer Guidelines"
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 the consumer to take certain suppression measures.
Table 1 Maximum Values of Outgoing Harmonic Currents per 1kW Contract Power
Received Power Voltage
6.6kV
22kV
33kV
(1)
Application for Specific Consumers Guidelines
Class
Three-phase bridge
3
(Capacitor smoothing)
Single-phase bridge
(capacitor smoothing,
double voltage rectification)
4
Single-phase bridge
(capacitor smoothing,
full-wave rectification)
5
Self-excitation three-phase bridge
Table 3 Equivalent Capacity Limits
Received Power Voltage
6.6kV
22/33 kV
66kV or more
5th
7th
11th
3.5
2.5
1.6
1.8
1.3
0.82
1.2
0.86
0.55
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equal to or less
than reference
capacity
Equivalent
capacity total
Above reference
capacity
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
limit?
Equal to or less
than upper limit
Harmonic suppression
measures unnecessary
Table 2 Conversion Factors
Circuit Type
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
Without reactor
With reactor (AC side)
Without reactor
With reactor (AC side)
When high power factor converter is used
Reference Capacity
50kVA
300kVA
2000kVA
EMC and leakage currents
13th
17th
1.3
1.0
0.69
0.53
0.46
0.35
More than upper limit
Harmonic suppression
measures necessary
19th
23rd
Over 23rd
0.9
0.76
0.70
0.47
0.39
0.36
0.32
0.26
0.24
Conversion Factor (Ki)
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K41 = 2.3
K42 = 0.35
K43 = 2.9
K44 = 1.3
K5 = 0
3
45
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