Electric Transformers/

Zig Zag Transformers

A zig zag transformer is a special-purpose type of 3 phase power transformer that is intended for use in providing earthing for ungrounded electrical systems as well as filtering and controlling harmonic currents. Since ungrounded systems need protection against earth faults, zig zag transformers work especially well because they have a zero sequence current that is common to all three phases, which provides a path that earth faults can follow to exit.

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Johnson Electric Coil Company
Antigo, WI
800-826-9741
For almost a century, Johnson Electric Coil has been providing great zig zag transformers for great reasons, in addition to unified, unselfish, single minded and outstanding customer service to every single client. In addition, Johnson's long-running success is due to their value added manufacturing techniques, which operates to the exacting production standards of its quality management system.
 
Pacific Transformer Corporation
Anaheim, CA
800-325-0501
Pacific Transformer is always available to solve your particular zig zag transformer engineering problems, from deeply technical requests to simple questions on magnetic devices or more responsive transformer sources. Pactran's superior customer service is just one more reason Pacific Transformer consistently outperforms all other transformer manufacturers, in addition to so much more!
 
Magnetic Windings Co., Inc.
Easton, PA
800-355-8574
Magnetic Windings Co., Inc. is an ISO 9001 approved supplier with a client list that includes major Fortune 500 companies in a variety of industries. Magnetic Windings is dedicated to serving your needs as a true "Business Partner" who can totally integrate into your existing manufacturing system. For excellent and affordable zig zag transformers, call Magnetic Windings today.
 
Triad Magnetics
Corona, CA
951-277-0757
Triad Magnetics understands that producing products for long-run reliability requires a high level of personal commitment and their team of experienced engineers is empowered with the responsibility for quality and reliability through a highly-evolved system of critical inspection, ensuring you with quality zig zag transformers and ongoing excellent customer service you expect and deserve.
 
Lenco Electronics, Inc.
McHenry, IL
815-344-2900
When you do business with Lenco Electronics, Inc., you can do it with confidence. Confidence that your zig zag transformer has been designed and engineered by professionals and has been manufactured with the highest quality materials available. Lenco's employees approach each individual job in a professional and knowledgeable manner- they know and care about what they are doing.
 
Altran Corp.
Crystal Lake, IL
815-455-5650
Altran has the manufacturing capabilities to produce high quality zig zag transformers in any size order and Altran is always cost efficient in providing relatively small prototype quantities and extremely competitive in producing high volume runs. As design and technology in the magnetics industry has rapidly advanced, equally has the sophistication of Altran's manufacturing facilities.
 
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Industry Information

Zig Zag Transformers

Zig zag transformers can be used in order to derive a reference point for ungrounded systems. Due to their ability to provide a neutral point for grounding purposes, numerous industries utilize zig zag transformers, including industrial, electronics, petrochemical, power distribution, automotive and hardware. An alternative to a zig zag transformer is a delta-wye transformer. Delta-wye transformers are a more popular choice because they are better known as well as at times being less expensive than zig zag transformers; however, zig zag transformers have lower internal impedance and can be more effective in certain applications than delta-wye transformers.

Zig zag transformers have earned their name from the zig zag design of their winding. Consisting of six coils on three separate cores, zig zag transformers have a primary winding but do not have a secondary winding. The windings for each phase of a zig zag transformer come in two halves. Thus, the difference in winding patterns results from the way in which the two halves of the windings interconnect while connecting the coils and the core. On each core, there are two coils. The first coil is connected to the second coil through the windings, of which there are two for each phase. Thus the outer and inner windings are wound onto the same core, but they are wound in opposite directions. While the first coil on each core is connected to the second coil on the next core, the second coils are all wound together and create the neutral. Since the phases are connected to the first coils, every phase is connected to every other phase, resulting in the voltages being canceled out. In order to provide earthing to ungrounded systems, a resistor is normally inserted between the neutral point of the transformer and the ground in order to limit the ground fault current and its effect on the system.