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Passive harmonic filter ‘exceeds active filter efficiencies’

04 December, 2013

The Canadian power quality specialist Mirus International has announced a high-performance harmonic filter that, it claims, matches the performance of active front-ends (AFEs) and is at least 2% more efficient than active harmonic filters (AHFs). It adds that the Lineator HP (high performance) filter is also free from the high-frequency harmonics and noise issues associated with inverters used in active systems.

The filters are designed to tackle current and voltage distortion problems caused by harmonics. When used with standard six-pulse VSDs (variable-speed drives), the new filters are said to result in low-harmonic drive systems that cost 20–30% less to buy than other technologies. Operating costs are also claimed to be significantly lower as a result of the efficiency gains.

“The Lineator HP is a leap forward for harmonic filters for mission-critical operations,” says Mirus’ president, Tony Hoevenaars.

Unlike AFEs or AHFs, the new ‎passive harmonic filters do not inject higher-frequency voltage distortion (from the 50th to 100th harmonics) or higher electromagnetic interference (EMI) common-mode voltages and ground currents, into electrical supply systems. High-voltage harmonics can lead to failures in connected equipment such as power supplies, test equipment, computers, PLCs, circuit-breakers with electronic trips, and other power system protection equipment.

Mirus International claims that its passive harmonic filter can outperform active systems

Al Archambault, Mirus’ director of sales, says that the new filters are “more reliable and easier to maintain than any of the complex AFE drives or active filters currently available”. He adds that their high efficiencies “have really set new standards in passive filter performance”.




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