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.
- Diverts the flow of harmonic currents away from neutral and upstream transformer
- Reduces high neutral current and neutral-to-ground voltage
- Eliminates the need for doable ampacity neutrals upstream
- Reduces losses and lowers operating temperature in upstream distribution transformer
- Substantially reduces primary winding circulating currents in distribution transformers
- Reduces current distortion at UPS, generator or Utility service
- Saves energy by reducing harmonic losses
- Prevents voltage flat-topping caused by non-linear loads
- Lowers voltage distortion to prevent premature equipment failure
- Restores ride-through capability of computer equipment
- Improves Power Factor
- Integrated ammeter measures neutral current removed
- Field adjustable impedance option offers improved application flexibility
- Helps meet IEEE Standard 519 harmonic limits
Designed to replace standard drive isolation transformers, the Drive Tamer™ is built to not only withstand the harsh harmonic environment produced by Variable Frequency Drives (VFD), but to also induce cancellation of harmonics upstream and thereby reduce voltage distortion throughout the distribution system.
By alternating 0° phase shifting models with 30° models, 5th and 7th harmonics are cancelled upstream. Where 3 loads are being serviced +20° , 0° , -20° models can reduce 5th, 7th, 11th and 13th harmonics, thereby dramatically reducing the voltage distortion these harmonics produce.
Drive 12/24™, Drive 18™ & Drive 24™
Multiple output auto or isolation transformers ideally suited for reduction of harmonics generated by VFDs or other 3-phase rectifier loads.
Drive 12/24™ produces a 12 pulse scheme (cancellation of 5th and 7th) when servicing two 6 pulse drives. A 24 pulse scheme is produced upstream (cancellation up to 23rd harmonic) when multiple Drive 12/24™ are used. Drive 18™ are used when servicing three 6 pulse drives to produce an 18 pulse scheme. The Drive 24™ will produce a 24 pulse scheme when servicing 4 drives. Each of these configurations will substantially reduce voltage distortion on the distribution system.