MITSUBISHI ELECTRIC FR-S520E - Manual (Page 31)

21
Main circuit terminals
1
WI
RING
1.2.11 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 harmonics.
The transistorized inverter has been excluded from the target products covered by
"harmonic suppression guideline for household appliances and general-purpose
products" in January 2004. In addition, all models of transistorized inverter used by
specific consumers are covered by "harmonic suppression guideline for consumers
who receive high voltage or special high voltage" (hereinafter referred to as "guideline
for specific consumers").
"Guideline for specific consumers"
This guideline sets forth the maximum values of harmonic currents outgoing from a
high-voltage or specially 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.
(1) Application of the guideline for specific consumers
Table 1 Maximum Values of Outgoing Harmonic Currents per 1kW Contract Power
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 0.86 0.55 0.46 0.35 0.32 0.26 0.24
Not more than
reference capacity
New installation/addition/
renewal of equipment
Calculation of equivalent
capacity sum
Sum of equivalent
capacities
Over reference
capacity
Calculation of outgoing
harmonic current
Is outgoing harmonic
current equal to or lower
than maximum value?
Not more than
maximum value
Harmonic suppression
technique is not required.
Over maximum value
Harmonic suppression
technique is required.