Mitsubishi FR - S500 Harmonic suppression technique requirement, Harmonic suppression techniques

Table 5 Rated Capacities and Outgoing Harmonic Currents for Inverter Drive

	Rated	6.6kV		Fundamental Wave Current Converted from 6.6kV
Applied	Current	Equivalent of	Rated
					(No reactor, 100% operation ratio)
Motor	[A]	Fundamental	Capacity
(kW)	400V	Wave Current	(kVA)	5th	7th	11th	13th	17th	19th	23rd	25th
		(mA)
0.4	0.81	49	0.57	31.85	20.09	4.165	3.773	2.107	1.519	1.274	0.882
0.75	1.37	83	0.97	53.95	34.03	7.055	6.391	3.569	2.573	2.158	1.494
1.5	2.75	167	1.95	108.6	68.47	14.20	12.86	7.181	5.177	4.342	3.006
2.2	3.96	240	2.81	156.0	98.40	20.40	18.48	10.32	7.440	6.240	4.320
3.7	6.50	394	4.61	257.1	161.5	33.49	30.34	16.94	12.21	10.24	7.092

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	Description
	Reactor installation	Install a reactor (ACL) in the AC side of the inverter or a reactor
1	(ACL, DCL)	(DCL) in its DC side or both to suppress outgoing harmonic
		currents.
	Installation of power	When used with a series reactor, the power factor improving
2	factor improving	capacitor has an effect of absorbing harmonic currents.
	capacitor
	Transformer multi-	Use two transformers with a phase angle difference of 30° as in -

3phase operation ∆ , ∆ -∆combination to provide an effect corresponding to 12 pulses, reducing low-degree harmonic currents.

	AC filter	A capacitor and a reactor are used together to reduce impedances
4		at specific frequencies, producing a great effect of absorbing
		harmonic currents.
	Passive filter	This filter detects the current of a circuit generating a harmonic
	(Active filter)	current and generates a harmonic current equivalent to a
5		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.

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