Mitsubishi Electronics FR-A500 ユーザーズマニュアル
36
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:
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:
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.
Note: The fundamental wave input currents are indicated because when a motor whose capacity is 3.7kW or
less is driven by a more than 3.7kW inverter, e.g. when a 3.7kW motor is driven by a 5.5kW inverter,
the transistorized inverter is not covered by the harmonic suppression guideline for household
appliances and general-purpose products and must be included in the calculation of harmonic currents
for the guideline.
Table 3 Equivalent Capacity Limits
Received Power Voltage
Reference Capacity
6.6kV
50kVA
22/33kV
300kVA
66kV or more
2000kVA
Table 4 Harmonic Content (Values at the fundamental current of 100%)
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 (AC, DC sides)
28
9.1
7.2
4.1
3.2
2.4
1.6
1.4
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
Pi: Rated capacity* of harmonic generating equipment [kVA]
i : Number indicating the conversion circuit type
* Rated capacity: 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.
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.
Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Applied
Motor
(kW)
Rated Current
[A]
Fundamental
Wave Current
Converted
from 6.6kV
Rated
Capacity
Outgoing Harmonic Current Converted from 6.6kV
(No reactor, 100% operation ratio)
200V
400V
(mA)
(kVA)
5th
7th
11th
13th
17th
19th
23rd
25th
0.4
1.61(Note)
0.81
49
0.57
31.85
20.09
4.165
3.773
2.107
1.519
1.274
0.882
0.75
2.74(Note)
1.37
83
0.97
53.95
34.03
7.055
6.391
3.569
2.573
2.158
1.494
1.5
5.50(Note)
2.75
167
1.95
108.6
68.47
14.20
12.86
7.181
5.177
4.342
3.006
2.2
7.93(Note)
3.96
240
2.81
156.0
98.40
20.40
18.48
10.32
7.440
6.240
4.320
3.7
13.0(Note)
6.50
394
4.61
257.1
161.5
33.49
30.34
16.94
12.21
10.24
7.092
5.5
19.1
9.55
579
6.77
376.1
237.4
49.22
44.58
24.90
17.95
15.05
10.42
7.5
25.6
12.8
776
9.07
504.4
318.2
65.96
59.75
33.37
24.06
20.18
13.97
11
36.9
18.5
1121
13.1
728.7
459.6
95.29
86.32
48.20
34.75
29.15
20.18
15
49.8
24.9
1509
17.6
980.9
618.7
128.3
116.2
64.89
46.78
39.24
27.16
18.5
61.4
30.7
1860
21.8
1209
762.6
158.1
143.2
79.98
57.66
48.36
33.48
22
73.1
36.6
2220
25.9
1443
910.2
188.7
170.9
95.46
68.82
57.72
39.96
30
98.0
49.0
2970
34.7
1931
1218
252.5
228.7
127.7
92.07
77.22
53.46
37
121
60.4
3660
42.8
2379
1501
311.1
281.8
157.4
113.5
95.16
65.88
45
147
73.5
4450
52.1
2893
1825
378.3
342.7
191.4
138.0
115.7
80.10
55
180
89.9
5450
63.7
3543
2235
463.3
419.7
234.4
169.0
141.7
98.10