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In which circuit Y or Delta are the phase and line currents equal?


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In which circuit Y or Delta are the phase and line voltages equal? Explain both answers, in terms that anyone with a basic knowledge of electricity could understand.


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  5. Explain the difference between a balanced polyphase system and an unbalanced polyphase system. What conditions typically cause a polyphase system to become unbalanced? Ask your students which type of three-phase system balanced or unbalanced is easier to analyze, and why that is so. In a balanced Y-connected power system, calculate the phase voltage E phase if the line voltage E line is volts.

    More important than obtaining the correct answer is for students to explain what they did to get that answer. What general calculation may be applied to balanced, Y-connected systems relating phase and line voltages? Calculate all voltages , currents , and total power in this balanced Delta-Delta system:. Be sure to ask your students to describe how they arrived at the answers to this question.

    Do I Need a Wye or Delta Transformer for Power Distribution?

    There is more than one place to start in determining the solution here, and more than one way to calculate some of the figures. No matter how your students may have approached this question, though, they should all obtain the same answers. What resistor values would we have to choose in a Delta configuration to behave exactly the same as this Y-connected resistor network?

    There exist long, complicated equations for converting between Y and Delta resistor networks, but there is a much simpler solution to this problem than that! Challenge your students to solve this problem without resorting to the use of one of those long conversion formulae. What will happen in each of these systems to the phase voltages of the load, if one of the source phases fails open? In the Y-Y system, with no neutral wire, one of the load phases will completely lose power, while the voltages of the other two load phases will be reduced to In the Delta-Y system, none of the phase voltages will be affected by the failure of the source phase winding.

    Ask your students what these results indicate about the reliability of Y versus Delta source configurations. Also, be sure to ask what does change in the Delta-Y system as a result of the failure. Certainly, something must be different from before, with one winding completely failed open! A common three-phase source connection scheme is the Delta high-leg or Four-wire Delta , where each phase coil outputs volts:.

    Identify the different voltages obtained from this coil configuration, and which connection points each voltage is measured between. The usefulness of this connection scheme should be clearly evident: Usually, the coils shown are secondary windings of three different transformers , the primary windings connected to a set of three-phase high voltage power lines. In many cases, a heavier-duty transformer is used for coil AC than for coils AB or BC due to the number of volt loads. Identify the primary-secondary connection configuration of these three power transformers i.

    Three-phase power transformers are somewhat rare compared to combinations of multiple single-phase transformers. This is also the same for Delta configurations. By comparison, a Delta circuit inside a transformer appears as a triangle with equal sides, resulting in a closed path.

    Chalk Talk: Open Delta Open Delta

    In most cases, such wiring configurations do not have a neutral and is present on the secondary side of the transformer. The three phases are connected at every meeting point on the triangle. Moreover, a Delta system is equipped with four wires: Transformer connections do not have to take on the same wiring configurations on the primary and secondary side, i.

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    Each configuration comes with their own respective benefits and use:. Larson Electronics Power Distribution. Business have several options for voltage rectification in industrial sites. For minor and accurate rectification, buck-boost transformers are frequently deployed LEDs, or light emitting diodes, are far more energy efficient than traditional incandescent, halogen, fluorescent, and high-intensity discharge light The presence of heat has negative effects on heavy-duty machinery in industrial buildings. Heat can force units to run harder, Wye vs Delta Connections Starting with Wye, the connection consists of a total of five wires: Which One Do I Need?

    Delta and Wye

    Each configuration comes with their own respective benefits and use: Delta-Wye transformers are commonly found in industrial facilities. From an economical perspective, this setup is advantageous, since Delta configurations are associated with lesser amps and less heat generation. Because of this, less insulation on the primary side is required. Smaller wiring on the primary coils can be utilized. On the secondary side, a neutral is provided.