Apparatus and method for representing protection device trip response
AssigneeGeneral Electric Company
InventorsThomas F. Papallo, Jr., Ahmed Elasser, Richard L. Hein
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Abstract
A method and apparatus generates an enhanced trip time curve capable of capturing both the non-sinusoidal energy and series effects. Relevant data including time, current, and energy is plotted on a three-dimensional set of axes. The resultant three-dimensional representation is useful for representing trip times for a protection device accounting for energy effects, and for determining selectivity in a multi-tier electrical distribution system.
Claims16
A method for representing trip times for a protection device comprising:
- plotting a series of trip times on a y-axis as a function of a series of current values on an x-axis;
- plotting a series of energy levels on a z-axis as a function of said series of current values on the x-axis, wherein a three-dimensional surface is generated.
A method for representing let-through times for a protection device comprising:
- plotting a series of clearing times on a y-axis as a function of a series of current values on an first scale of an x-axis;
- and
- plotting a series of energy levels on a z-axis as a function of said series current values on the x-axis, wherein a three-dimensional surface is generated.
A method for determining selectivity in a multi-tier electrical distribution, system comprising:
- plotting a series of trip limes on a y-axis as a function of a series of current values on an x-axis and plotting a series of energy levels on a z-axis as a function of said series current values on the x-axis, wherein a first three-dimensional surface is generated representing behavior of a first device;
- and
- plotting a series of clearing times on a y-axis as a function of said series of current values on said x-axis and plotting a series of energy levels on a z-axis as a function of said series of current values on the x-axis, wherein a second three-dimensional surface is generated representing behavior of a second device.
An article of manufacture comprising:
- a computer usable medium having computer readable program code means embodied therein for generating a representation of trip times for a protection device the computer readable program code means in said article of manufacture comprising:
- computer readable program code means for causing a computer to effect a series of trip times on a y-axis as a function of a series of current values on an x-axis and a series of energy levels on a z-axis as a function of said series of current values on the x-axis, wherein a first three-dimensional surface is generated;
- and
- computer readable program code means for causing a computer to effect a series of clearing times on a y-axis as a function of said series of current values on an first scale of an x-axis and plotting a series of energy levels on a z-axis as a function of said series of current values on the x-axis, wherein a second three-dimensional surface is generated.
A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for determining selectivity in a multi-tier electrical distribution system, said method steps comprising:
- plotting a series of trip times on a y-axis as a function of a series of current values on an x-axis and plotting a series of energy levels on a z-axis as a function of said series current values on the x-axis, wherein a first three-dimensional surface is generated;
- and
- plotting a series of clearing times on a y-axis as a function of said series of current values on an first scale of an x-axis and plotting a series of energy levels on a z-axis as a function of said series current values on the x-axis, wherein a second three-dimensional surface is generated.
Dependencies are inferred from the claim text.