Series passive filters have been a popular form of harmonic mitigation for 6 pulse VFD and DC drives (and other rectifier loads) following their introduction in 2002.
They are relatively simple, rugged, both electrically and environmentally.
Offer excellent performance (<5% THDi) at nominal load, even up to 2.5% supply voltage imbalance .
Available from IP00 and to enclosures to IP55 for use in ambient temperatures to 55 deg C and voltages from 380V to 690V 50/60Hz and ratings 10A to 1400A.
IP00 reactor with IP23 capacitor unit
IP00 reactor with tap changer and IP23 capacitor unit
Brochure with specifications
Series Passive Filter Brochure
RiteSineLab harmonic simulations
RiteSineLab harmonic simulation software simulates 6 pulse VFDs, DC drives, programmable current source devices, PFC and linear loads. For mitigation, both series passive filters and active filters can be modelled. Up to 30 nodes can be accommodated.
Considered in the calculations are :
- Transformers (including those for each node, if applicable)
- Generators (up to 8 off in parallel)
- Transformers per node
- Cables
- Drive reactors (AC and DC bus)
- Linear loads
- Power factor correction
- Background harmonic voltage distortion
- Voltage asymmetry (imbalance)
After a simulation has been run, a report is available based on IEEE‐519‐1992, IEEE‐519‐2014, IEEE-519-2022 and other harmonic recommendations and rules, the latter mainly for marine and offshore use. In addition, at the source; transformer or generator, switchboard, PFC, discrete drive and linear load nodes a full set of voltage and current waveforms and harmonic spectra are available. The harmonic spectra, although set by default 50th order, can also present harmonics to the 100th.
RiteSineLab, harmonic software illustrating some of the features
RiteSineLab simulation SLD of 2820kW of 6 pulse VFDs - no harmonic mitigation
RiteSineLab simulation SLD of 2820kW of 6 pulse VFDs - SPF mitigation
Sentinel Power Quality has the knowledge and experience
When applied correctly, passive filters are an important tool in the harmonic mitigation toolbox. However, no form of harmonic mitigation is perfect. The secret of success is recognising the pros and cons of all types of active and passive mitigation and being able to apply the most appropriate form of mitigation for any given application.
The engineers at Sentinel Power Quality have been involved in applying active and series passive filters since 2003 to standard and demanding applications.
Contact us with your application details and let us assist you.