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Star Delta connections regarding motors - Electricians Forum. Star Delta can be a little confusing, so you're not alone.
I know sparks who won't even touch it! The above image is of alternative wiring. Note at the delta contactor that the phases swap.Basically you have to follow the wiring from the supply side of the line contactor, through the motor windings and back through the delta contactor back to the supply, so that you start at one phase and end at another.One other thing:Overloads; if before the line contacor and delta contactor, as in a motor breaker, set at 100% of motor's flc (full load current)If after the line contactor then set at 58% flcAnother tip: setting the star to delta transistion time.
Clamp a phase with an ammeter. Double-Tongued Dictionary. Starting today, the Double-Tongued Dictionary is now a part of A Way with Words!
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On some motors, all six ends are brought out (2 ends per winding). On those motors, it is possible to connect the three windings such that they form a triangle shape (this is the DELTA configuration), or a radial shape that sort of looks like the letter Y (the WYE or STAR configuration). One then connects the three power leads from your 3-phase source to three points in those configurations. In some motors, the windings are already connected in delta or wye within the motor, and only three leads are brought out for connection of power. Regarding operating the motor, each winding is designed for the same fixed voltage. For example, say you have a motor where all six ends of the three windings are brought out, and that each winding is designed to operate at 460V. Now, 797V is not a standard voltage, so what the six leads really are used for is for "reduced-voltage" starting.
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