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Wye-Connected Variable Load

Three-phase variable load wired in wye configuration

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  • Simscape / Electrical / Passive / RLC Assemblies

  • Wye-Connected Variable Load block


The Wye-Connected Variable Load block models a three-phase variable load wired in a wye configuration. Each limb of the load contains a resistor. The block calculates the resistance required to draw the real power of the physical signal input P at the rated voltage that you specify. Therefore, the block can represent a real load.

To ensure that the resistance is always greater than zero, you specify the minimum real power that the load consumes. The minimum real power must be greater than zero.


The resistance is defined by



  • R is the per-phase series resistance.

  • VRated is the RMS, rated line-line voltage.

  • P is the three-phase real power required.



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Physical signal input port associated with the real power.


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Expandable three-phase port.

Electrical conserving port associated with the neutral phase.


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RMS, rated line-line voltage for the resistance equation.

Minimum real power that the three-phase load dissipates when supplied at the rated voltage. The value must be greater than 0.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Introduced in R2014b