Low Pass Harmonic Filters
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MVAlso Available For Medium Voltage
Low Pass Harmonic Filters
(Type LPF) 200-690 volts 50/60hz
APPLICATION: Three Phase Low Pass Harmonic Filters are ideal for both commercial and industrial equipment such as variable frequency motor drives, pumps, fans, compressors, chillers, conveyors, cranes and many other types of electronic controls. Our KS version achieves harmonic current distortion levels as low as 5% THD-i and complies with IEEE-519 and other international power quality standards. May be used to filter harmonics for one or more variable frequency drives.
Two Choices: Three Stage Filter (KS) Version and Two Stage Filter (KB) Versions
Three Stage Filter (KS Version)
Three stage filter that significantly reduces 5th -51st harmonics, achieves 5% THD-i and brings AC variable frequency drive systems into compliance with international power quality standards including IEEE-519. Use with virtually any 6-pulse AC variable frequency drive to achieve the lowest possible levels of harmonic distortion at all operating conditions from 0% to 100% load. KS version filters may also be used to reduce harmonic distortion in DC drive systems.
Two Stage Filter (KB Version)
Two stage filter that reduces 5th -51st harmonics to low levels and helps to bring AC variable frequency drive systems into compliance with limits for harmonic distortion. This economical low pass harmonic filter relies upon inductance within the VFD to serve as a third stage of filtering to achieve low levels of harmonic distortion.
| 1. Type KS Standard Version 3-Stage Filter |
2. Type KB Basic Version 2-Stage Filter |
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Use our standard (Type KS) Low Pass Harmonic Filter, to achieve 5% THD-I for 6-pulse drives. |
Use our basic 2-stage filter (Type KB) to meet 5-8% /THD when taking advantage of internal VFD inductance. Type KB filters may also be used w/o internal VFD inductance when THD limit is 8-12%. |
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| Typical Performance 3-Stage (KS) and 2-Stage (KB) |
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| Typical Distortion Levels for Various Harmonic Mitigation Techniques | ||||
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| AC VFD without Internal Reactor |
AC VFD with 3% Internal Reactor |
AC VFD with 5% Internal Reactor |
DC Drive | |
| KS Version | ≤ 5% THD-i | ≤ 5% THD-i | ≤ 5% THD-i | Varies by speed and load |
| KB Version | Varies by system | 8-12% THD-i | 5-8% THD-i | Varies by speed and load |
| 5% Line Reactor | 35% THD-i | 28% THD-i | 26% THD-i | 25 - 40% THD-i |
| 3% Line Reactor | 45% THD-i | 32% THD-i | 28% THD-i | 30 - 50% THD-i |
| Nothing | 40-80% THD-i | 45% THD-i | 35% THD-i | 40 - 60% THD-i |
