Schneider Altivar 71 VW3A7201 handleiding

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Handleiding

8 1757361 06/2012

Checking the installation

Operation on a transformer

If only some loads are operating on one section of the line supply, then the transformer that is connected must be capable of transporting

the unused generated power from this section to the next voltage level without exceeding the voltage edge permitted in the line supply

section. The nominal power of the transformer must therefore be one and a half times greater than the power generated outside the section,

so that the harmonic and reactive components of the current can be transmitted. In the line supply section shown in the diagram below,

these conditions are verified even if the other loads are disconnected.

If the power that is generated is in the region of the nominal power of the transformer, then the transformer short circuit voltage must be

fairly low (6% maximum) to limit the voltage increase in this section.

The operation of the braking unit used with a sized transformer (for example in the case of a slip ring induction motor) is only permitted if

the ratio of the power generated to the nominal power is considerably less than 1.

10kV

0.4kV

100kVA

60kW

20kW

ATV71

VW3A7...

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