Star point

Joins the three phases at a neutral pin.

  • electrical
  • 3-phase
  • Modelica Standard Library
  • 2 ports
BlockStar pointKindstarLibrary3-phase

Description

Joins the three phases of a plug at one neutral pin, forming a wye (star) point.

Example

Three-phase loads A 10 V three-phase supply into a resistive star load, a series R–L star load, and a capacitor bank in delta.

10 V 50 HzStar supplyGround supplyStar (R)Ground (R)Star (R–L)Ground (R–L)PowerCurrents (R)R 10 ΩR 10 Ω (R–L)Currents (R–L)L 31.8 mHCurrents (C)C 100 µFDeltaPhase aPhase bPhase cv av bv cGround aGround bGround c
In Gradara, select a Star point block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Voltage sensorGround3-phase AC source3-phase resistor3-phase inductor3-phase capacitorDelta connectionPhase a tapPhase b tapPhase c tap3-phase current sensor3-phase power sensor

Ports

Conserving terminals 2

  • abcplug_p3-phase

    Three-phase plug (phases a, b, c), all joined to pin_n.

  • Npin_nelectrical

    Neutral pin (single-phase). Carries the sum of the three phase currents.

Equations

Modelica
plug_p.a.v = plug_p.b.v = plug_p.c.v = pin_n.v
plug_p.a.i + plug_p.b.i + plug_p.c.i + pin_n.i = 0

Implementation

Modelica Standard Library 4.1.0Modelica.Electrical.Polyphase.Basic.Star
MSL documentation

Tips

  • Ground pin_n to reference a floating three-phase circuit; leave it unconnected for an isolated neutral.

See also

Select a block in Gradara and press F1 to open its page offline.