The primary is wound as Delta, and the secondary is wound as Wye. Figure 2 shows a delta–delta transformer connection. In this case, the RMS rotates in high speed and the rotor has large mass and inertia. the high leg in the three-phase system - it just seems strange to have this odd leg - it seems like it would throw off the symetry of the 3-phase "braid." Because we have two legs, each leg of the short strangle should have about .15 delta (.30 ÷ 2). Referring back to the options chain, we can find calls and puts with .15 delta. Occasionally, (especially in older facilities or in oil well and irrigation applications), you may encounter a three-phase delta service with one phase (leg) connected to ground, called a “corner grounded delta” or “grounded leg service”. This type of wiring may also be beneficial for operations that require a minor single-phase component. The magnetic field poles of the stator and rotor are not easily synchronized (“cached”). This center tap is grounded to produce voltages of 120V, 208V, 120V to ground respectively on the A, B and C phases. Though one can be provided, which is called a high leg. High leg delta has one winding center tapped. As posted above, motors are dumb. Delta/Delta is used in many industrial installations, while Delta/Wye is the most common configuration. An older, but still widely used high-leg delta system uses three phases with 240 volts phase-to-phase for motor loads, and 120 volts for lighting loads by use of a center-tapped transformer; two of the phases are 120 volts to neutral. The single-phase load can be fed by grounding a center tap on one of the legs of the delta secondary, then connecting the single-phase load between one of the phases on the grounded leg and this grounded neutral. The original purpose of a "high leg" service was to supply motor loads and lighting from a single service. Wye/Delta is used in high voltage transmission, and Wye/Wye is seldom used because of potential unbalance. Three coils linked in this way form the delta connection. Figure 3 is the schematic for a Delta/Wye configuration. If the phase to phase voltage is in the motor's tolerance, they will run just fine. • Delta-Delta: A Delta-Delta configuration is recommended for projects that does not need a neutral on the secondary side. * open delta connection is special case of 3 phase transformer * to meet the conditions of getting open delta , we require * 3 separate cored transformers, in which failure of any one transformer will not effect of flux path for remaining. It is not in and of itself useful. L DO NOT CONNECT ANY 120 VOLT, TO NEUTRAL, LOADS TO THE HIGH LEG. Your legs are two of your most important body parts. A delta connection is formed by connecting the end of one coil to the start of another. also what would happen if the delta leg were paired witha regular 120 leg by accident? 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