Harmonic Suppression Guidelines - Mitsubishi Electric FR-A520-0.4K Instruction Manual

2.3.2

Harmonic suppression guidelines

Harmonic currents flow from the inverter to a power receiving point via a power transformer. The harmonic
suppression guidelines were established to protect other consumers from these outgoing harmonic currents.
1) "Harmonic suppression guideline for household appliances and general-purpose products"
This guideline was issued by Ministry of Economy, Trade and Industry (formerly the Ministry of
International Trade and Industry) in September, 1994 and applies to 200V class inverters of 3.7kW or less.
By installing the FR-BEL or FR-BAL power factor improving reactor, inverters comply with the "harmonic
suppression techniques for transistorized inverters (input current 20A or less)" established by the Japan
Electrical Manufacturers' Association. Therefore install the optional reactor for the 200V class, 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
especially high-voltage consumer who will install, add or renew harmonic generating equipment. If any of
the maximum values are 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
New installation/addition/renewal of equipment
ot more than
eference capacity
Over reference capacity
Calculation of outgoing harmomic current
Harmomic suppression technique is not required.
Table 2 Conversion Factors for FR-A500 Series
Class
3-phase bridge
3
(Capacitor-smoothed)
5 Self-exciting 3-phase bridge
7th 11th
2.5 1.6
1.3 0.82
0.86 0.55
Calculation of equivalent capacity sum
Sum of equivalent capacities
Is outgoing harmonic cur-
rent equal to or lower than
maximum value ?
Not more than
maximum value
Circuit Type
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
When high power factor converter is used
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INSTALLATION AND WIRING
13th 17th 19th
1.3 1.0 0.9
0.69 0.53 0.47
0.46 0.35 0.32
Over maximum value
Harmomic suppression technique is required.
Conversion Factor Ki
35
23rd Over 23rd
0.76 0.70
0.39 0.36
0.26 0.24
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K5 = 0
2