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US 4,996,624 AGranted
Fault location method for radial transmission and distribution systems
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorEdmund O. Schweitzer, III
Life of this patent
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Abstract
A method of locating a phase-to-ground fault in a radial distribution system with a tapped load. The method includes determining the positive-sequence impedance from the residual current, the residual current compensation factor and the phase-to-ground voltage of the faulted line. The positive-sequence impedance is then used to determine the distance to the fault.
Claims4
A method for determining the positive-sequence impedance to a fault comprising:
- measuring the phase-to-ground voltage of the faulted line and the zero-sequence component of the fault current;
- determining the residual current and
- using the residual current (IR) and the residual current compensation factor (k) to determine the positive-sequence impedance by dividing said phase-to-ground voltage by IR.times.(1+k).
A method of locating a phase-to-ground fault in a radial distribution circuit with at least one tapped load, comprising:
- measuring the phase-to-ground voltage of the faulted line and the zero-sequence component of the fault current;
- determining the residual current;
- using the residual current (IR) and the residual current compensation factor (k) to determine the positive-sequence impedance by dividing said phase-to-ground voltage by IR.times.(1+k) wherein the positive-sequence impedance includes the positive-sequence resistance and reactance;
- and
- determining the distance to the fault by dividing the positive-sequence reactance by the total reactance of the faulted line and multiplying that value by the total length of the line.
2 more elements
Dependencies are inferred from the claim text.