KEB COMBILINE, Manual

Page: 10 / 16

GB - 10
Applications:
- Observance the standards
- smaller voltage drop compared to mains choke
- Reduction of effective input current (supply via generators )
- Protection of frequency inverter in case of bad mains (voltage overshoots)
- Protection of “non-rigid supply systems”
- Increasing DC link lifetime (several KEB COMBIVERT can be operated at
one filter.)
Optional:
- Thermal contact
- Option HF filter
- 3ph/ 230 VAC/ 500 VAC/ 690 VAC
- Housing type, mechanical structure IP23
Reactive-power compensation equipment without choke and resonance danger
Reactive-power compensation equipment are used in the power supply of
companies. Disturbances or damages at these units can have effects to the
power supply of the company and they can cause losses of production.
In practice many reactive-power compensation equipments without choke are
still used. Various problems can occur in this connection:
- direct resonance
- resonance danger
- switching transient
- interference of ripple control transmission
For the case that resonances occur it is not essential whether a company causes
itself disturbance of main supply network. The compensation power at the
transformer is decisive for the risk that resonances occur. The higher the power
the higher the resonance risk. An important factor for this is the harmonic
preloading in the ms level. The harmonic preloading is transferred by the
transformer and affects the ns level.