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3
1
OUTLINE
Pre-operation instructions
(1) Application of the Harmonic Suppression Guideline for Specific Consumers
Table 2 Conversion Factors for FR-A700 Series
Table 3 Equivalent Capacity Limits
Table 4 Harmonic Content (Values at the fundamental current of 100%)
(a) Calculation of equivalent capacity P0 of harmonic generating equipment
The "equivalent capacity" is the capacity of a 6-pulse converter converted from the capacity of a consumer's harmonic
generating equipment and is calculated with the following equation. When the sum of equivalent capacity exceeds the limits
in Table 3, harmonics must be calculated in the following procedure.
(b) Calculation of outgoing harmonic current
Outgoing harmonic current=fundamental wave current (value converted from received power voltage)
operation ratio
harmonic content
Operation ratio: Operation ratio = actual load factor operation time ratio during 30 minutes
Harmonic content: Found in Table 4.
Classification Circuit Type Conversion Factor Ki
3
Three-phase bridge
(Capacitor smoothed)
Without a reactor K31=3.4
With a reactor (on AC side) K32=1.8
With a reactor (on DC side) K33=1.8
Without a reactor (on AC/DC side) K34=1.4
5
Self-excitation three-phase
bridge
With the converter K5=0
Received
Power Voltage
Reference
Capacity
6.6kV 50kVA
22/33kV 300kVA
66kV or more
2000kVA
Reactor 5th 7th 11th 13th 17th 19th 23rd 25th
Not used 65 41 8.5 7.7 4.3 3.1 2.6 1.8
Used (AC side) 38 14.5 7.4 3.4 3.2 1.9 1.7 1.3
Used (DC side) 30 13 8.4 5.0 4.7 3.2 3.0 2.2
Used (on AC/DC side) 28 9.1 7.2 4.1 3.2 2.4 1.6 1.4
P0 = (Ki Pi) [kVA]
Rated capacity: Rated capacity is determined by the capacity of the applied
motor and found in Table 5. It should be noted that the rated capacity used here
is used to calculate generated harmonic amount and is different from the power
supply capacity required for actual inverter drive.
Ki: Conversion factor(According to Table 2)
Pi: Rated capacity of harmonic generating equipment
[kVA]
i : Number indicating the conversion circuit type
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equivalent
capacity total
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
limit?
Harmonic suppression
measures unnecessary
Harmonic suppression
measures necessary
Equal to or less
than upper limit
More than upper limit
Above reference
capacity
Equal to or less
than reference
capacity
HC2.book 3 ページ ２０１２年１１月１９日 月曜日 午前１０時５２分