Fault location in electric power delivery systems
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorsMangapathirao Venkata Mynam, Yanfeng Gong, Armando Guzman-Casillas
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Abstract
Accurately calculating location of a phase-to-phase fault even on a branched, non-homogenous, radial electric power distribution system. The calculation includes determining a calculated reactance to the fault without using positive-sequence current measurements, and uses the line parameters to determine locations on the system that match the calculated reactance to the fault. The calculation may further include a determination of faulted phase and eliminate fault location possibilities based on absence of the faulted phase at those locations.
Claims22
A system for determining a location of a fault in a radial electric power delivery system with at least two branches, comprising:
- a first device in electrical communication with the radial electric power delivery system for obtaining power system voltage and current information therefrom and determining whether a fault condition exists thereon;
- and,
- a fault locator in communication with the first device, including:
- a receive module for receiving:
- an indication from the first device of a phase-to-phase fault condition on the radial electric power delivery system;
- and,
- radial electric power delivery system data including the voltage and current information or a value calculated therefrom from the first device;
- a fault location determination module for determining possible fault locations and creating a list of the possible fault locations using:
- the radial electric power delivery system data from the first device;
- physical parameters of the radial electric power delivery system;
- and,
- a calculated reactance to the fault calculated without using positive-sequence current.
A method for determining a location of a fault having a fault type in an radial electric power delivery system, comprising a first intelligent electronic device in electrical communication with the radial electric power delivery system, the method comprising:
- obtaining, at the first intelligent electronic device radial electric power delivery system voltage and current information from the radial electric power delivery system;
- determining, at the first intelligent electronic device a phase-to-phase fault condition on the radial electric power delivery system;
- communicating the phase-to-phase fault condition and radial electric power delivery system data including the voltage and current information or a value calculated therefrom from the first intelligent electronic device to a fault locator;
- determining using the fault locator a possible fault location on the radial electric power delivery system and creating, using the fault locator, a list of the possible fault locations using:
- the radial electric power delivery system data;
- physical parameters of the radial electric power delivery system;
- and,
- a calculated reactance to the fault calculated without using positive-sequence current.
Dependencies are inferred from the claim text.