Safety information
26
Operating instructions SVCD(S)
123456278
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419A58
Elektrotechnische Anlagen GmbH
1
Unchoked compensation plants and resonance rise
Compensation plants are used in the centre of the power supply of a company. Distur-
bances or damages at these plants have effects on the power supply and may result in in-
terrupted production processes.
Although this is no longer state of the art, many compensation plants are in operation
without any choking. The problems which result from a usage of such an unchoked com-
pensation plant are manifold:
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direct resonance
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resonance rise
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switching transients or
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impairments of centralized ripple systems
The fact, that a company produces back effects to the power supply is not the only reason
for the creation of resonance. Decisive for the risk, to generate a resonance is the com-
pensation power at the medium voltage transformer. The higher this power is, the higher
is the risk of resonance. The second important factor is the harmonic load of the medium
voltage level. This harmonic load is transmitted via the transformer and causes effects on
the low voltage level. Most often the limits were exceeded for the 5th harmonic compo-
nent.