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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 a
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 in the following
procedure:
Σ
P0 = (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
• Operation ratio: Operation ratio = actual load factor × operation tim ratio during 30 minutes
• Harmonic content: Found in Table 4.
Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Rated
Applied
Current
Motor
[A]
(kW)
200V
400V
1.61
0.4
0.81
(Note)
2.74
0.75
1.37
(Note)
5.50
1.5
2.75
(Note)
7.93
2.2
3.96
(Note)
13.0
3.7
6.50
(Note)
5.5
19.1
9.55
7.5
25.6
12.8
11
36.9
18.5
15
49.8
24.9
18.5
61.4
30.7
22
73.1
36.6
30
98.0
49.0
37
121
60.4
45
147
73.5
55
180
89.9
Note:When a motor of 3.7kW or less capacity is driven by a transistorized inverter of more than 3.7kW.
For example, when a 3.7kW or less motor is driven by a 5.5kW transistorized inverter, the
transistorized inverter is not the target of the household appliances/general-purpose products
guideline, but because they must be included in the calculation of the harmonic current of the
guideline, the fundamental wave input currents are indicated.
3) Harmonic suppression technique requirement
If the outgoing harmonic current is higher than the maximum value per 1kW contract power × contract
power, a harmonic suppression technique is required.
fundamental wave current
=
(value converted from received power voltage)
Fundamental
Rated
Wave Current
Capacity
Converted from
(kVA)
6.6kV (mA)
49
0.57
83
0.97
167
1.95
240
2.81
394
4.61
579
6.77
776
9.07
1121
13.1
1509
17.6
1860
21.8
2220
25.9
2970
34.7
3660
42.8
4450
52.1
5450
63.7
* 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.
Fundamental Wave Current Converted from 6.6kV(mA)
(No reactor, 100% operation ratio)
5th
7th
11th
31.85
20.09
4.165
3.773
53.95
34.03
7.055
6.391
108.6
68.47
14.20
12.86
156.0
98.40
20.40
18.48
257.1
161.5
33.49
30.34
376.1
237.4
49.22
44.58
504.4
318.2
65.96
59.75
728.7
459.6
95.29
86.32
980.9
618.7
128.3
116.2
1209
762.6
158.1
143.2
1443
910.2
188.7
170.9
1931
1218
252.5
228.7
2379
1501
311.1
281.8
2893
1825
378.3
342.7
3543
2235
463.3
419.7
- 3 -
operation
harmonic
×
×
ratio
content
13th
17th
19th
23rd
2.107
1.519
1.274
3.569
2.573
2.158
7.181
5.177
4.342
10.32
7.440
6.240
16.94
12.21
10.24
24.90
17.95
15.05
33.37
24.06
20.18
48.20
34.75
29.15
64.89
46.78
39.24
79.98
57.66
48.36
95.46
68.82
57.72
127.7
92.07
77.22
157.4
113.5
95.16
191.4
138.0
115.7
234.4
169.0
141.7
25th
0.882
1.494
3.006
4.320
7.092
10.42
13.97
20.18
27.16
33.48
39.96
53.46
65.88
80.10
98.10
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