Harmonic Suppression Guidelines - Mitsubishi Electric FR-CC2-H355K Instruction Manual

Power supply harmonics
3.2.2

Harmonic Suppression Guidelines

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 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"the Harmonic Suppression Guideline for Household Appliances and General-purpose Products" was repealed on September 6, 2004.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
Received power
voltage
6.6 kV 3.5
22 kV 1.8
33 kV 1.2
Application of the specific consumer guidelines
• Conversion factors
Classification
Three-phase bridge
3
(Capacitor smoothing)
5
Self-excitation three-phase bridge
• Equivalent Capacity Limits
Received power voltage
6.6 kV
22/33 kV
66 kV or more
• Harmonic content (Values of the fundamental current is 100%)
reactor
Used (DC side)
Used (AC, DC sides)
64
PRECAUTIONS FOR USE OF THE INVERTER
5th 7th 11th
2.5 1.6
1.3 0.82
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
Harmonic suppression
measures unnecessary
Circuit type
With reactor (DC side)
With reactors (AC, DC sides)
When a high power factor converter is used
Reference capacity
50 kVA
300 kVA
2000 kVA
5th 7th
30 13 8.4
28 9.1 7.2
13th 17th
1.3 1.0
0.69 0.53
0.46 0.35
More than upper limit
limit?
Harmonic suppression
measures necessary
Equal to or less
than upper limit
11th 13th 17th
5.0 4.7
4.1 3.2
19th 23rd
0.9 0.76 0.70
0.47 0.39 0.36
0.32 0.26 0.24
Conversion coefficient Ki
K33 = 1.8
K34 = 1.4
K5 = 0
19th 23rd
3.2 3.0
2.4 1.6
Over
23rd
25th
2.2
1.4