Parameter independent traveling wave-based fault location using unsynchronized measurements

A device for fault location in a power transmission line connecting a first terminal with a second terminal, the device comprising:

• a travelling wave detector to
• detect a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at the first and second terminals,
• obtain arrival times of the first peak, the second peak, and the third peak of the travelling wave detected from measurements carried out at the first and second terminals, and
• calculate a rise time associated with the first peak of the travelling wave detected from the measurements carried out at the first and second terminals;
• a fault localization module configured to
• identify one of a first half and a second half of the power transmission line, as having a fault, based on a comparison of the calculated rise time associated with the first peak of the travelling wave;
• identify a segment of the power transmission line as having the fault, based on the identification of one of the first and the second half as having the fault, and a comparison of the arrival times of the first, second, and third peaks of the travelling wave;
• and
• a fault location module coupled to a processor to
• estimate a length of the power transmission line based on the identified segment, the arrival time of the first peak of the travelling wave reflected from the second terminal detected from the measurements carried out at the first terminal, and the arrival time of the first peak of the travelling wave reflected from the first terminal detected from the measurements carried out at the second terminal, and
• estimate the fault location based on the identified segment, the arrival times of the first, second, and third peaks of the travelling wave detected from measurements carried out at the first and second terminals, and the estimated length of the power transmission line.

A non-transitory computer-readable medium having instructions stored thereon, wherein the instructions, when executed by a processor, cause the processor to perform a method comprising:

• obtaining arrival times of a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at each of the first and second terminals;
• calculating a rise time associated with the first peak of the travelling wave detected from the measurements carried out at the first and second terminals;
• identifying one of a first half and a second half of the power transmission line as having a fault, based on a comparison of the rise time estimated for the first peak of the travelling wave at the first and second terminals;
• identifying a segment of the power transmission line as having the fault, based on the identification of one of the first and the second half as having the fault, and a comparison of the arrival times of the first, second, and third peaks of the travelling wave at the first terminal or the second terminal;
• estimating a length of the power transmission line based on the identified segment, the arrival time of the first peak of the travelling wave reflected from the second terminal detected from the measurements carried out at the first terminal, and the arrival time of the first peak of the travelling wave reflected from the first terminal detected from the measurements carried out at the second terminal;
• and
• estimating the fault location based on the identified segment, the arrival times of the first, second, and third peaks of the travelling wave detected from measurements carried out at the first and second terminals, and the estimated length of the power transmission line.