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Neutral
Current Eliminator™ (NCE™)
A 3-phase, low
zero sequence impedance autotransformer, which when connected near
to and in parallel with the harmonic generating non-linear loads
(usually connected at the distribution panel), provides an alternate
path for 3rd, 9th, & 15th current harmonics (triplens) which
the loads create. Patented Field Adjustable Impedance (FAI) feature
allows for adjustment of NCE™ zero sequence impedance to field
conditions.
Reduces
neutral current and neutral-to-ground voltage as well as both current
and voltage triplen harmonic distortion.
Combined
Neutral Current Eliminator™ (CNCE™)
A patented phase shifting autotransformer with a low zero sequence
impedance at its output. When connected in series on a 3-phase, 4-wire
service to non-linear loads, it provides an alternate path for the triplen
harmonics. The CNCE™ also phase shifts 5th and 7th current harmonics
by 180º so that they cancel with 5th and 7th harmonics from other
loads on the distribution system. Optional FAI feature allows for removal
of triplens from the CNCE™ input side as well as secondary.
Reduces neutral current, and neutral-to-ground voltage, as well
as both current and voltage harmonic distortion at 3rd, 5th, 7th, &
9th harmonics.
5-7, 11-13
and 5-13 Eliminators™
3-phase, 3-wire autotransformers with 30°, 15° or 20° phase
shift between input and output. They are connected in series with the
supply to variable frequency drives, UPS systems, and other 3-phase
rectifier loads.
By phase shifting against other similar loads, they reduce 5th
and 7th or 11th and 13th harmonic currents at point of common coupling
which, in turn, reduces voltage distortion as well.
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