Siemens EK 726 Series Manual de Serviço descarregar pdf (Página 59)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

3/35 Version D

3.13 Line supply harmonics and line supply impedance

Line supply harmonics

In operation, the drive inverter causes non-sinusoidal line currents with harmonics. These harmonic currents can be

reduced by using line reactors.

Line impedance

The ratio between the rated drive power / system fault level should not fall below 1 %. This means, that when the drive

inverter is operating at full load, the voltage drop across the line impedance should be less than or equal to 1% of the

rated voltage. If the line impedance is below this value (rated drive inverter power / system fault level less than 1%), a

line-commutating reactor must be used, as otherwise this could result in a shorter lifetime of the DC link capacitors.

The power supply company (power utility company) should be contacted regarding the system fault level or, this may

be able to be taken from the rating plate of the upstream transformer.

Voltage and current spikes

Furthermore, line-commutating reactors reduce or smooth voltage and current spikes.

Table showing the non-sinusoidal harmonics caused by the drive inverter.

They are listed as an approximate percentage of 1 %, 2 % and 4 %.

Drive inverter

supply voltage

Harmonic No.

(1 = basic

fundamental)

Current harmonic referred to

the basic fundamental,

for a 1 % line supply

impedance

Current harmonic refer to

the basic fundamental,

for a 2 % line supply

impedance

Current harmonic refer to

the basic fundamental,

for a 4 % line supply

impedance

1-ph. 230 V AC 1 100 100 100

3 87.9 83.1 76.2

5 68.2 56.9 41.3

7 45.5 29.2 14.3

9 24.2 10.8 6.3

11 9.1 7.7 6.3

13 6.1 6.2 3.2

3-ph. 230 V AC 1 100 100 100

(drive inverter <= 22 kW) 5 72.9 56.3 39.4

7 48.4 31.3 14.7

11 10.6 6.6 6.9

13 5.5 6.6 3.4

3-ph. 230 V AC 1 100 100 100

(drive inverter > 22 kW) 5 32 29.2 26.0

7 9.6 7.9 6.9

11 7.8 7.0 5.9

13 3.7 3.6 3.4

3-ph. 400/500 V AC 1 100 100 100

(drive inverter <= 37 kW) 5 72.5 62.0 41.0

7 52.6 36.7 16.5

11 17.0 7.4 7.3

13 7.2 6.2 3.2

3-ph. 400/500 V AC 1 100 100 100

(drive inverter > 37 kW) 5 42.7 37.8 32.6

7 17.7 13.2 9.2

11 6.7 7.1 6.9

13 4.0 3.5 3.3

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 119 120

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Siemens EK 726 Series Manual de Serviço Página 59

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