Technical data and dimension diagrams
Operating instructions RHF
39
ELTROPLAN
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REVCON
Elektrotechnische Anlagen GmbH
6.7 Cable cross section
When wiring a RHF-filter module the drive system should be wired with the same
cross section as without filter module.
6.8 General information
With this information the installers and users of a plant should be given information
on special characteristics and rules in terms on a filter module.
With this information no demand of completeness will be raised.
Compensation plants without chokes and resonance danger
Compensation plants are used in centre of the power supplies of companies. Dis-
turbances or damages at these plants can affect to the power supplies of the com-
pany and cause expensive losses of production.
In fact today therr are still many compensation plants without chokes used alt-
hough the actual guidelines are in conflict with this fact.. The problems, which can
occur in connection with a compensation plant without chokes, are manifold:
- Direct Resonance
- Resonance lifting
- Switching transients or
- Impairment of ripple control transmission
Rising of resonances is not determined whether an operation itself causes har-
monic distortions. Decisive for the risk to encounter a resonance is the compensa-
tion power at the transformer. The risk of a resonance will rise together with the
compensation power and is influenced by the harmonic load of the medium volt-
age level, which is transmitted by the transformer and effects the low-voltage lev-
el.
Limit exceeding, caused by resonance lifting, may particularly bedetected espe-
cially for the 5th harmonic.
