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Peripheral Devices
Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive
Rated
Applie
Current
Fundamental
d
[A]
Motor
(kW)
400V
0.4
0.81
0.75
1.37
1.5
2.75
2.2
3.96
3.7
6.50
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)
Installation of power
2
factor improving
capacitor
Transformer multi-phase
3
operation
4
AC filter
Passive filter
5
(Active filter)
6.6kV
Rated
Wave
Capacity
Current
(kVA)
Converted
(mA)
49
0.57
83
0.97
167
1.95
240
2.81
394
4.61
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.
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
- ,
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.
Outgoing Harmonic Current Converted from
6.6kV (mA) (No reactor, 100% operation ratio)
5th
7th
11th 13th 17th 19th 23rd 25th
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
Description
-
combination to provide an effect corresponding to
32
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