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Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Applied
200V class
Motor
Rated
(kW)
Current [A]
0.4
0.75
1.5
Not applied
2.2
3.7
5.5
19.1
7.5
25.6
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.
4) Harmonic suppression techniques
No.
Item
Reactor installation
1
(ACL, DCL)
High power factor
converter
2
(FR-HC)
Installation of power
3
factor improving
capacitor
Transformer multi-
4
phase operation
AC filter
5
Passive filter
(Active filter)
6
6.6kV
Equivalent of
Rated
Fundamental
Capacity
Wave Current
(kVA)
(mA)
49
0.57
83
0.97
167
1.95
240
2.81
394
4.61
579
6.77
776
9.07
Install a reactor (ACL) in the AC side of the inverter or a reactor
(DCL) in its DC side or both to suppress outgoing harmonic
currents.
The converter circuit is switched on-off to convert an input
current waveform into a sine wave, suppressing harmonic
currents substantially. The high power factor converter (FR-HC)
is used with the standard accessory.
When used with a series reactor, the power factor improving
capacitor has an effect of absorbing harmonic currents.
Use two transformers with a phase angle difference of 30° as in
-∆, ∆-∆ combination to provide an effect corresponding to 12
pulses, reducing low-degree harmonic currents.
A capacitor and a reactor are used together to reduce
impedances at specific frequencies, producing a great effect of
absorbing harmonic currents.
This filter detects the current of a circuit generating a harmonic
current and generates a harmonic current equivalent to a
difference between that current and a fundamental wave current
to suppress a harmonic current at a detection point, providing a
great effect of absorbing harmonic currents.
INSTALLATION AND WIRING
Fundamental Wave Current Converted from 6.6kV
(No reactor, 100% operation ratio)
5th
7th
11th
13th
31.85 20.09 4.165 3.773 2.107 1.519 1.274 0.882
53.95 34.03 7.055 6.391 3.569 2.573 2.158 1.494
108.6 68.47 14.20 12.86 7.181 5.177 4.342 3.006
156.0 98.40 20.40 18.48 10.32 7.440 6.240 4.320
257.1 161.5 33.49 30.34 16.94 12.21 10.24 7.092
376.1 237.4 49.22 44.58 24.90 17.95 15.05 10.42
504.4 318.2 65.96 59.75 33.37 24.06 20.18 13.97
Description
34
17th
19th
23rd
25th
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