Abb Schweiz Ag

Abb Power Grids Switzerland Ag

Hitachi Energy Switzerland Ag

Amit Purohit

Jianping Wang

Obbalareddi Demudu Naidu

Sachin Srivastava

Od Naidu

Vinay Kariwala

Naidu Obbalareddi Demudu

A method and system is provided for locating a fault in a mixed power transmission line. The method is implemented by an Intelligent Electronic Device (IED) of the mixed line. The IED detects a travelling wave from one or more signals received from one or more measurement equipment. Thereafter, the IED identifies a line section with the fault, and generates two or more estimates for the location of the fault based on a time difference between arrival of two peaks of the travelling wave, a velocity of propagation of the travelling wave in the line section identified with the fault, and a length of one or more line sections. The IED determines the location of the fault based on a comparison of each estimate with a threshold, wherein the threshold is estimated based on the one or more signals, equivalent source impedance of each source and total line impedance.

Method and system for locating a fault in a mixed power transmission line

A method is provided for protection in a mixed power transmission line by controlling a switching device connected thereto through an Intelligent Electronic Device (IED). The mixed line has two or more sections with at least one overhead section (A) and at least one underground section (B), wherein every two consecutive sections are connected at a junction (C). The method is implemented by the IED (), which receives a signal from a measurement equipment. The IED detects a travelling wave from the signal, and determines a first peak of the travelling wave and at least one a peak width, a rise time and a discharge time of the first peak. The IED identifies the section with the fault based on a comparison of at least one of the peak width, the rise time and the discharge time with a corresponding threshold value of each junction, and controls the switching device based on the comparison.

Method for protection in a mixed power transmission line

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Indore, India

Amit Purohit