초록 ▼

A method for identifying a fault condition associated with a power line conductor of an electrical power distribution network. The method determines if a load current carried by the conductor is above a minimum load current, determines a learned phase angle relationship between the load current and

A method for identifying a fault condition associated with a power line conductor of an electrical power distribution network. The method determines if a load current carried by the conductor is above a minimum load current, determines a learned phase angle relationship between the load current and a source signal, determines a load current magnitude, determines a real-time phase angle relationship between the load current and the source signal and indicates a fault condition when the real-time phase angle relationship is within a predetermined number of angular degrees of the learned phase angle relationship and when the load current magnitude exceeds a fault-indicating current.

대표청구항 ▼

What is claimed is: 1. A method for identifying a fault condition associated with a power line conductor of an electrical power distribution network, the method comprising:determining a load current carried by the conductor is above a minimum load current value;determining a learned phase angle rela

What is claimed is: 1. A method for identifying a fault condition associated with a power line conductor of an electrical power distribution network, the method comprising:determining a load current carried by the conductor is above a minimum load current value;determining a learned phase angle relationship between the load current and a source signal;storing the learned phase angle relationship;determining a real-time phase angle relationship between the load current and the source signal by determining if the load current drops below the minimum load current value continuously for a first time period and then increases above the minimum load current value, initiating a second time period and determining the real-time phase angle relationship between the load current and the source signal after the second time period has ended andindicating a fault condition when the real-time phase angle relationship is within a predetermined number of angular degrees of the learned phase angle relationship and when the load current exceeds a fault-indicating current value.