Application Of The Specific Consumer Guidelines - Mitsubishi Electric FR-XC-18.5K-PWM Instruction Manual

Pre-operation instructions
 Application of the specific consumer guidelines
• Conversion factor
Classification
Three-phase bridge
3
(capacitor smoothing)
Self-excitation three-phase
5
bridge
• Equivalent capacity limit
Received power voltage
6.6 kV
22/33 kV
66 kV or more
• Harmonic contents (values of the fundamental current is 100%)
Reactor
Not used
Used (AC side)
Used (DC side)
Used (AC, DC sides)
• Calculation of equivalent capacity P0 of harmonic generating equipment
"Equivalent capacity" is the capacity of a 6-pulse converter converted from the capacity of consumer's harmonic
generating equipment and is calculated by the following equation. If the sum of equivalent capacities is higher than the
limit (refer to page
P0 = Σ (Ki × Pi) [kVA]
Ki: Conversion factor (Refer to
Pi: Rated capacity of harmonic generating equipment
i: Number indicating the conversion circuit type
• Calculation of outgoing harmonic currents
Outgoing harmonic currents = fundamental wave current (value converted from received power voltage) × operation
ratio × harmonic contents
• Operation ratio: actual load factor × operation time ratio during 30 minutes
• Harmonic contents: Refer to the list of the harmonic contents.
12
OUTLINE
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equal to or less
than reference
capacity
capacity total
Above reference
capacity
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
Harmonic suppression
measures unnecessary
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
When a multifunction regeneration converter with
harmonic suppression enabled is used
Reference capacity
50 kVA
300 kVA
2000 kVA
5th 7th
65 41
38 14.5
30 13
28 9.1
12), harmonics must be calculated by the equation in next subheading.
page 12.)
Equivalent
More than upper limit
limit?
Harmonic suppression
measures necessary
Equal to or less
than upper limit
Circuit type
11th 13th
8.5 7.7 4.3
7.4 3.4 3.2
8.4 5.0 4.7
7.2 4.1 3.2
[kVA]
∗1
Conversion factor Ki
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K5 = 0
17th 19th 23rd
3.1 2.6
1.9 1.7
3.2 3.0
2.4 1.6
∗1
Rated capacity: Determined by the capacity of the
applied motor and found in the following table. The
rated capacity used here is used to calculate the
generated harmonic amount and is different from
the power supply capacity required for actual
inverter drive.
25th
1.8
1.3
2.2
1.4