If the phase to phase voltage is in the motor's tolerance, they will run just fine. The magnetic field poles of the stator and rotor are not easily synchronized (“cached”). 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. Referring back to the options chain, we can find calls and puts with .15 delta. As posted above, motors are dumb. 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." Your legs are two of your most important body parts. * 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. The primary is wound as Delta, and the secondary is wound as Wye. Three coils linked in this way form the delta connection. The original purpose of a "high leg" service was to supply motor loads and lighting from a single service. The high leg is a byproduct of another feature. Wye/Delta is used in high voltage transmission, and Wye/Wye is seldom used because of potential unbalance. Delta/Delta is used in many industrial installations, while Delta/Wye is the most common configuration. • Delta-Delta: A Delta-Delta configuration is recommended for projects that does not need a neutral on the secondary side. Though one can be provided, which is called a high leg. A delta connection is formed by connecting the end of one coil to the start of another. High leg delta has one winding center tapped. Figure 2 shows a delta–delta transformer connection. The 495 call and the 360 put (outlined in yellow) have deltas that add up to 30% (.1576 delta for the calls + .1423 delta for the puts = .2999). also what would happen if the delta leg were paired witha regular 120 leg by accident? In this case, the RMS rotates in high speed and the rotor has large mass and inertia. It is not in and of itself useful. I understand more or less HOW it is made (i.e. L Figure 3 is the schematic for a Delta/Wye configuration. DO NOT CONNECT ANY 120 VOLT, TO NEUTRAL, LOADS TO THE HIGH LEG. 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. 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”. 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