Harmonic Suppression Guideline - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

3.1.4

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.
The three-phase 200V input specifications 3.7kW or less are previously covered by "Harmonic suppression guideline
for household appliances and general-purpose products" and other models are covered by "Harmonic suppression
guideline for consumers who receive high voltage or special high voltage". However, the general-purpose inverter has
been excluded from the target products covered by "Harmonic suppression guideline for household appliances and
general-purpose products" in January 2004. Later, this guideline was repealed on September 6, 2004. All capacities of
all models are now target products of "Harmonic suppression guideline for consumers who receive high voltage or
special high voltage".
"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 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
5th
Voltage
6.6kV 3.5
22kV 1.8
33kV 1.2
(1) Application of the harmonic suppression guideline for specific consumers
Class
Three-phase bridge
3
(Capacitor smoothing)
5 Self-exciting three-phase bridge
Table 3 Equivalent Capacity Limits
Received Power Voltage
6.6kV
22/33kV
66kV or more
Table 4 Harmonic content (Values of the fundamental current is 100%)
Reactor
Not used
Used (AC side)
Used (DC side)
Used (AC, DC sides)
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
limit?
Equal to or less
than upper limit
Harmonic suppression
measures unnecessary
Table 2 Conversion factors for FR-F700P series
Circuit Type
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactor (AC, DC sides)
When high power factor converter is used
Reference Capacity
50kVA
300kVA
2000kVA
5th 7th 11th
65 41 8.5
38 14.5 7.4
30 13 8.4
28 9.1 7.2
EMC and leakage currents
13th 17th 19th
1.3 1.0 0.9
0.69 0.53 0.47
0.46 0.35 0.32
More than upper limit
Harmonic suppression
measures necessary
13th 17th
7.7 4.3
3.4 3.2
5.0 4.7
4.1 3.2
23rd Over 23rd
0.76 0.70
0.39 0.36
0.26 0.24
Conversion Factor (Ki)
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K5 = 0
19th 23rd 25th
3.1 2.6 1.8
1.9 1.7 1.3
3.2 3.0 2.2
2.4 1.6 1.4
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