Definition
A method of connecting the three windings of a three-phase electrical system in which one end of each winding is joined together at a common point (the neutral), and the other ends form the three output terminals. The resulting wiring diagram resembles the letter Y. In a wye connection, line voltage is approximately 1.73 times the voltage across any single winding, while line current equals the current through each winding.
Plain English
A way of wiring a three-phase electrical system where one end of each of the three coils is joined at a single shared point, and the other ends become the three output wires. When drawn on paper, the three coils form a Y shape.
Context Anchor
Seen in aircraft electrical-system descriptions and wiring diagrams for alternators, generators, and some power systems that use three-phase alternating current.
Derivation
Named simply for its shape: the wiring diagram looks like the letter Y, and 'wye' is the spelled-out name of that letter. Sometimes called a 'star connection' for the same reason.
Why Pilots Care
Delivers balanced three-phase power that aircraft rectifiers convert to stable DC for avionics, instruments, and charging systems.
Analogy
Picture three roads meeting at one central intersection. In a wye connection, the three windings meet at one shared electrical point in a similar Y-shaped layout.
Intuition Check
Do not assume a wye connection means the outside wires are physically shaped like a Y. It describes how the internal electrical windings are connected.
Example Sentence 1
The aircraft's three-phase generator uses a wye connection, giving the system both 115-volt and 200-volt outputs from the same windings.
Example Sentence 2
During a preflight electrical check the mechanic verified that the wye connection showed no open neutral that could unbalance the output voltage.