Safety information
page 26
ELTROPLAN-REVCON
Unchoked compensation plants and resonance rise
Compensation plants are used in the centre of the power supply of a company.
Disturbances or damages at these plants have effects on the power supply and
may result in interrupted production processes.
Although this is no longer state of the art, many compensation plants are in op-
eration without any choking. The problems which result from a usage of such
an unchoked compensation 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 compensation 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 component.