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- Zigzag_transformer abstract "A zigzag transformer is a special-purpose transformer with a zigzag or "interconnected star" winding connection, such that each output is the vector sum of two phases offset by 120°. Its applications are for the creation of a missing neutral connection from an ungrounded 3-phase system to permit the grounding of that neutral to an earth reference point and also harmonic mitigation, as it can suppress triplet (3rd, 9th, 15th, 21st, etc.) harmonic currents, to supply 3-phase power as an autotransformer (serving as the primary and secondary with no isolated circuits), and to supply non-standard, phase-shifted, 3-phase power.Nine-winding, three-phase transformers typically have 3 primaries and 6 identical secondary windings, which can be used in zigzag winding connection as pictured. As with the conventional delta or wye winding configuration three-phase transformer, a standard, stand-alone transformer containing only six windings on three cores can also be used in zigzag winding connection, such transformer sometimes being referred to as a zigzag bank. In all cases, six or nine winding, the first coil on each zigzag winding core is connected contrariwise to the second coil on the next core. The second coils are then all tied together to form the neutral, and the phases are connected to the primary coils. Each phase, therefore, couples with each other phase, and the voltages cancel out. As such, there would be negligible current through the neutral point, which can be tied to ground.Each of the three "limbs" are split into two sections. The two halves of each limb have an equal number of turns and are wound in opposite directions. With the neutral grounded, during a phase-to-ground short fault, a third of the current returns to the fault current, and the remainder must go through two of the three phases when used to derive a grounding point from a delta source.If one or more phases fault to earth, the voltage applied to each phase of the transformer is no longer in balance; fluxes in the windings no longer oppose. (Using symmetrical components, this is Ia0 = Ib0 = Ic0.) Zero-sequence (earth fault) current exists between the transformer’s neutral to the faulting phase. The purpose of a zigzag transformer in this application is to provide a return path for earth faults on delta-connected systems. With negligible current in the neutral under normal conditions, providing the defective load will be automatically disconnected in a fault condition, an undersized transformer may be used only as short-time rating is required (i.e. the transformer can only carry full rated current for, say, 60 s). Impedance should not be too low for desired maximum fault current. Impedance can be added after the secondaries are summed to limit maximum fault currents (the 3Io path).An application example: A combination of Y (wye or star), delta, and zigzag windings may be used to achieve a vector phase shift. For example, an electrical network may have a transmission network of 110 kV/33 kV star/star transformers, with 33 kV/11 kV delta/star for the high-voltage distribution network. If a transformation is required directly between the 110 kV/11 kV network, an option is to use a 110 kV/11 kV star/delta transformer. The problem is that the 11 kV delta no longer has an earth reference point. Installing a zigzag transformer near the secondary side of the 110 kV/11 kV transformer provides the required earth reference point.".
- Zigzag_transformer thumbnail Zigzag_transformer_vector_sketch.gif?width=300.
- Zigzag_transformer wikiPageID "1241344".
- Zigzag_transformer wikiPageLength "5335".
- Zigzag_transformer wikiPageOutDegree "10".
- Zigzag_transformer wikiPageRevisionID "673801054".
- Zigzag_transformer wikiPageWikiLink Category:Transformers_(electrical).
- Zigzag_transformer wikiPageWikiLink Earth_reference_point.
- Zigzag_transformer wikiPageWikiLink Ground_and_neutral.
- Zigzag_transformer wikiPageWikiLink Harmonics_(electrical_power).
- Zigzag_transformer wikiPageWikiLink Phase_(waves).
- Zigzag_transformer wikiPageWikiLink Phase_shift.
- Zigzag_transformer wikiPageWikiLink Symmetrical_components.
- Zigzag_transformer wikiPageWikiLink Three-phase.
- Zigzag_transformer wikiPageWikiLink Transformer.
- Zigzag_transformer wikiPageWikiLink Zigzag.
- Zigzag_transformer wikiPageWikiLink File:Stern-zickzack-trafo.gif.
- Zigzag_transformer wikiPageWikiLink File:Zigzag_transformer_vector_sketch.gif.
- Zigzag_transformer wikiPageWikiLinkText "Zigzag transformer".
- Zigzag_transformer wikiPageWikiLinkText "zig zag".
- Zigzag_transformer wikiPageWikiLinkText "zig-zag transformer".
- Zigzag_transformer wikiPageWikiLinkText "zigzag grounding transformer winding".
- Zigzag_transformer wikiPageWikiLinkText "zigzag grounding winding".
- Zigzag_transformer wikiPageWikiLinkText "zigzag or interconnected star".
- Zigzag_transformer wikiPageWikiLinkText "zigzag transformer".
- Zigzag_transformer hasPhotoCollection Zigzag_transformer.
- Zigzag_transformer wikiPageUsesTemplate Template:According_to_whom.
- Zigzag_transformer wikiPageUsesTemplate Template:Citation_needed.
- Zigzag_transformer subject Category:Transformers_(electrical).
- Zigzag_transformer hypernym Transformer.
- Zigzag_transformer type Article.
- Zigzag_transformer type Article.
- Zigzag_transformer type Component.
- Zigzag_transformer comment "A zigzag transformer is a special-purpose transformer with a zigzag or "interconnected star" winding connection, such that each output is the vector sum of two phases offset by 120°.".
- Zigzag_transformer label "Zigzag transformer".
- Zigzag_transformer sameAs Zickzackschaltung.
- Zigzag_transformer sameAs m.04lf97.
- Zigzag_transformer sameAs Q198468.
- Zigzag_transformer sameAs Q198468.
- Zigzag_transformer wasDerivedFrom Zigzag_transformer?oldid=673801054.
- Zigzag_transformer depiction Zigzag_transformer_vector_sketch.gif.
- Zigzag_transformer isPrimaryTopicOf Zigzag_transformer.