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Illustration of the transform in its T-Π representation. The Y-Δ transform is known by a variety of other names, mostly based upon the two shapes involved, listed in either order. The Y, spelled out as wye, can also be called T or star; the Δ, spelled out as delta, can also be called triangle, Π (spelled out as pi), or mesh.
ΔY- and YΔ-transformations are a tool both in pure graph theory as well as applications. Both operations preserve a number of natural topological properties of graphs. . For example, applying a YΔ-transformation to a 3-vertex of a planar graph, or a ΔY-transformation to a triangular face of a planar graph, results again in a planar graph.
An example delta-wye transformer schematic. A delta-wye transformer is a type of three-phase electric power transformer design that employs delta-connected windings on its primary and wye/star connected windings on its secondary. A neutral wire can be provided on wye output side. It can be a single three-phase transformer, or built from three ...
The primary application of the transform is in design and analysis of electrical circuits, but it is a theorem of graph theory, meaning that it can also be applied in other fields. This image is meant as a replacement of Image:Delta wye circ.PNG. Date: 13 January 2007 (original upload date) Source: No machine-readable source provided.
A "delta" (Δ) connected transformer winding is connected between phases of a three-phase system. A "wye" (Y) transformer connects each winding from a phase wire to a common neutral point. A single three-phase transformer can be used, or three single-phase transformers. In an "open delta" or "V" system, only two transformers are used.
Note: solving for ′ returns the resultant angle in the first quadrant (< <). To find , one must refer to the original Cartesian coordinate, determine the quadrant in which lies (for example, (3,−3) [Cartesian] lies in QIV), then use the following to solve for :
delta-wye transformer One type of connection of a three-phase transformer. demand factor The fraction of actual use of some quantity, related to the maximum that could be used in a specified time. demand response The ability of a generating station or grid to follow changes in load while maintaining voltage and frequency within acceptable limits.
2.2 Delta-wye transformation. 2.2.1 Delta-to-star transformation equations. ... Examples of methods that can be used for both these stages are given below.