Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual page 42

Table 3 Equivalent Capacity Limits
Received Power Voltage Reference Capacity
6.6kV
22/33kV
66kV or more
Table 4 Harmonic Content (Values at the fundamental current of 100%)
Reactor 5th
Not used 65
Used (AC side) 38
Used (DC side) 30
Used (AC, DC sides) 28
1) 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 consumer's
harmonic generating equipment and is calculated with the following equation. If the sum of equivalent
capacities is higher than the limit in Table 3, harmonics must be calculated with the following procedure:
P0 = Σ (Ki × Pi) [kVA]
Ki: Conversion factor (refer to Table 2)
Pi: Rated capacity of harmonic generating equipment* [kVA]
I : Number indicating the conversion circuit type
2) 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.
Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Fundamental
Applied Wave Current
Rated Current [A]
Converted from
Motor
6.6kV
(kW (HP))
200V 400V
0.4 (0.5) 0.81
0.75 (1) 1.37
Not
1.5 (2) 2.75
applied
2.2 (3) 3.96
3.7 (5) 6.50
5.5 (7.5) 19.1 9.55
7.5 (10) 25.6 12.8
11 (15) 36.9 18.5
15 (20) 49.8 24.9
18.5 (25) 61.4 30.7
22 (30) 73.1 36.6
30 (40) 98.0 49.0
37 (50) 121 60.4
45 (60) 147 73.5
55 (75) 180 89.9
3) Harmonic suppression technique requirement
If the outgoing harmonic current is higher than; maximum value per 1kW (contract power) × contract
power, a harmonic suppression technique is required.
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50kVA
300kVA
2000kVA
7th 11th 13th
41 8.5 7.7
14.5 7.4 3.4
13 8.4 5.0
9.1 7.2 4.1
Rated Fundamental Wave Current Converted from 6.6kV
Capacity
(mA) (kVA) 5th 7th
49 0.57 31.85 20.09
83 0.97 53.95 34.03
167 1.95 108.6 68.47
240 2.81 156.0 98.40
394 4.61 257.1 161.5
579 6.77 376.1 237.4
776 9.07 504.4 318.2
1121 13.1 728.7 459.6
1509 17.6 980.9 618.7
1860 21.8 1209 762.6
2220 25.9 1443 910.2
2970 34.7 1931 1218
3660 42.8 2379 1501
4450 52.1 2893 1825
5450 63.7 3543 2235
31
INSTALLATION AND WIRING
17th 19th 23rd
4.3 3.1 2.6
3.2 1.9 1.7
4.7 3.2 3.0
3.2 2.4 1.6
ity: Determined by the capacity
*: Rated capac
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 d
rive.
(No reactor, 100% operation ratio)
11th 13th 17th 19th
4.165 3.773 2.107 1.519
7.055 6.391 3.569 2.573
14.20 12.86 7.181 5.177
20.40 18.48 10.32 7.440
33.49 30.34 16.94 12.21
49.22 44.58 24.90 17.95
65.96 59.75 33.37 24.06
95.29 86.32 48.20 34.75
128.3 116.2 64.89 46.78
158.1 143.2 79.98 57.66
188.7 170.9 95.46 68.82
252.5 228.7 127.7 92.07
311.1 281.8 157.4 113.5
378.3 342.7 191.4 138.0
463.3 419.7 234.4 169.0
25th
1.8
1.3
2.2
1.4
23rd 25th
1.274 0.882
2.158 1.494
4.342 3.006
6.240 4.320
10.24 7.092
15.05 10.42
20.18 13.97
29.15 20.18
39.24 27.16
48.36 33.48
57.72 39.96
77.22 53.46
95.16 65.88
115.7 80.10
141.7 98.10