Calculating line-to-neutral voltage without connecting system neutral or ground

Calculating line-to-neutral voltage without connecting system neutral or ground

  • CN 105,044,426 B
  • Filed: 04/24/2015
  • Issued: 01/31/2020
  • Est. Priority Date: 04/28/2014
  • Status: Active Grant
First Claim
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1. , a method for determining a voltage, the method comprising:

  • measuring three line-to-line voltages of phases in a three-phase power system, each line-to-line voltage comprising a voltage magnitude;

    constructing a phasor triangle including the three line-to-line voltages expressed as phasors on a two-dimensional coordinate system having an origin, wherein the th phasor VabOriginating at point and extending in the direction of the horizontal axis of the coordinate system to the origin, a second phasor VbcExtending between said origin and a second point, said second point being in a vertical and horizontal direction with respect to said origin, and a third phase quantity VcaExtending between said second point and said point ;

    adding th line segment, the th line segment is selected from the second phasor VbcThe point of bisection is perpendicular to the second phasor VbcAnd extends away from the direction of the phasor triangle, the th line segment terminating at a third point;

    adding a second line segment that follows the third phasor VcaThe point of bisection is perpendicular to the third phasor VcaAnd extending away from the direction of the phasor triangle, the second line segment terminating at a fourth point;

    adding a third line segment from the third point to the th point;

    adding a fourth line segment from the fourth point to the origin;

    wherein the third line segment intersects the fourth line segment at a neutral point; and

    determining a line-to-neutral voltage, the line-to-neutral voltage comprising a line from the neutral point to a vertex of the phasor triangle.

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