Economical Solution to Triplen Harmonics

Our zero sequence filter transformers offer a simple and cost effective solution to facility power quality problems associated with triplen harmonics (3rd, 9th, etc). ZST Series transformers are specially to reduce the harmonics associated with single phase non-linear loads supplied form a 4-wire power system. The impedance to zero sequence currents will be less than (1%) one percent with our transformers. Connect these at a 4-wire distribution panel that feeds non-linear line to neutral connected single phase loads. Our zero sequence transformers are manufactured to help to improve your productivity while keeping tight controls on costs.

Up to 600 volts
50hz or 60hz
Three phase, 4 - wire

The standard features that you want

Weight and cost are both minimized by our efficient use of aluminum winding conductors. Your installation costs are kept to a minimum through our use of finger-safe terminations on units rated less than 150 amps. Transformers with higher current ratings have solid copper tab type terminals. The UL200C temperature rating of our insulation materials are economically utilized while maintaining adequate operating safety margins.

Optional features available when needed

There is no sense paying for features you don't need. That's why we've designed our standard ZST Series zero sequence transformers to include the features you must have, but to leave all others as options for you to choose only when you need them. You can specify thermal switches, enclosure types and many other options to your order when you need them.

Enclosures that meet your needs

While many transformer companies only offer enclosed transformers. because they use the cabinet walls as the transformer mounting brackets. You'll be pleased to know that we'll accommodate your needs for the enclosure and mounting method you want. Whether you need open core & coil construction or enclosures for Nema 1, Nema 12 or Nema 3R applications. We'll even provide Nema 12 potted construction for maximum protection and minimum audible noise.

Broad range of ratings available

Standard ratings range form 15 amps (phase current) up to 300 amps (phase current). Higher current ratings are no problem either – simply contact the factory any time you need a different rating. We'll be happy to quote the part that meets your exact needs. All zero sequence transformers manufactured by Controlled Magnetics are available in both low voltage and medium voltage ratings.

Custom Zero Sequence Transformers are available to your specifications.

Zero Sequence Filter Transformers - Standard

Our zero sequence filter transformers are easy to select. Simply size them for the phase current (circuit breaker rating). All of our standard units are constructed with neutrals that will handle three times the phase current. Our ZST series transformers are normally used on four wire power systems, but they can be used on three wire systems to attenuate triplen harmonics caused by the unbalanced distribution of loads.

Open Style (enclosure is optional)

Some of the transformer types provided in this category: zero sequence impedance transformers, zero sequence blocking transformer, zero sequence transformers, zero sequence filter transformers, custom zero sequence transformer manufacturers