Method for locating distribution network circuit fault based on full waveform information

A method for locating a faulty section on a line in an electrical power distribution network having multiple measurement points along each line and protected by protection devices, comprising:

• measuring a three-phase current and a zero-sequence voltage on a busbar in an electrical power distribution network where a fault has occurred at a section on a line,
• determining a type, phase, and time of the fault based on the three-phase current and zero-sequence voltage being measured,
• measuring the three-phase current or a zero-sequence current and a zero-sequence voltage at initial ends of each line in the electrical power distribution network during a time period from occurrence of the fault to action by the protection device,
• determining a faulty line that has the faulty section thereon based on the type of the fault and the three-phase current or the zero-sequence current and the zero-sequence voltage at initial ends of each line being measured,
• measuring a current at each of measurement points along the faulty line, and
• locating the faulty section on the faulty line by the current at each of the measurement points along the faulty line,
• wherein the protection device is a relay protection device or an arc suppression coil;
• when the type of the fault is determined to be an inter-phase fault, the three-phase current at the initial ends of each line during the time period from the occurrence of the fault to the action of the relay protection device are measured to determine the faulty line, and a fault-phase current at each measurement points along the faulty line are measured to locate the faulty section;
• and
• when the type of the fault is determined to be a grounding fault, the zero-sequence current and the zero-sequence voltage at the initial ends of each line during the time period from the occurrence of the fault to action of the arc suppression coil are measured to determine the faulty lire, and zero-sequence current at each measurement points along the faulty line are measured to locate the faulty section.