Siemens DTU3005-B Especificaciones descargar pdf (Pagina 24)

Harmonic Sequence A harmonic’s phase rotation relationship to the fundamental

frequency is known as harmonic sequence. Positive sequence

harmonics (4th, 7th, 10th, ...) have the same phase rotation as

the fundamental frequency (1st). The phase rotation of negative

sequence harmonics (2nd, 5th, 8th, ...) is opposite the

fundamental harmonic. Zero sequence harmonics (3rd, 6th,

9th, ...) do not produce a rotating field.

Odd numbered harmonics are more likely to be present than

even numbered harmonics. Higher numbered harmonics have

smaller amplitudes, reducing their affect on the power and

distribution system.

Harmonic Frequency Sequence

1st 60 Fundamental

2nd 120 Negative

3rd 180 Zero

4th 240 Positive

5th 300 Negative

6th 360 Zero

7th 420 Positive

8th 480 Negative

9th 540 Zero

10th 600 Positive

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 87 88

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Siemens DTU3005-B Especificaciones Pagina 24