公开(公告)号：US10447030B2

公开(公告)日：2019-10-15

申请号：US15549198

申请日：2016-03-03

Applicant: ABB Schweiz AG

Inventor： Obbalareddi Demudu Naidu ,  Amit Purohit ,  Vinay Kariwala ,  Jianping Wang

IPC: H02H7/26 ,  G01R31/08 ,  H02H1/00 ,  H02H3/06

Abstract: 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 (10A) and at least one underground section (10B), wherein every two consecutive sections are connected at a junction (10C). The method is implemented by the IED (14), 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.

公开(公告)号：US20200348352A1

公开(公告)日：2020-11-05

申请号：US16957408

申请日：2018-10-31

Applicant: ABB Schweiz AG

Inventor： Swaroop Gajare ,  Obbalareddi Demudu Naidu ,  Neethu George ,  Sachin Srivastava ,  A.V. Sai

IPC: G01R31/08 ,  H02J13/00

Abstract: A method and device can be used with a power transmission line. Pre-fault voltage and current phasors and during-fault voltage and current phasors for each of first, second, and third terminals are determined based on disturbance records. Using an assumed faulted section, values for a propagation constant of each section, a surge impedance of each section, and a fault location parameter are computed. The computing is based on simultaneously solving pre-fault and during-fault objective functions for the assumed faulted section with the computed pre-fault and during-fault voltage and current phasors. The pre-fault and during-fault objective functions are formulated based on equating junction voltages determined from two of the terminals, conservation of charge at the junction, and equating fault location voltages determined from one terminal and the junction. The values determined for the propagation constant, the surge impedance, and the fault location parameter can be compared with predefined criteria.

公开(公告)号：US20200041562A1

公开(公告)日：2020-02-06

申请号：US16524134

申请日：2019-07-28

Applicant: ABB Schweiz AG

Inventor： Obbalareddi Demudu Naidu ,  Neethu George

IPC: G01R31/08 ,  H02H1/00 ,  H02H7/26

Abstract: Techniques for identifying faulty sections in power transmission lines are described. A first positive sequence voltage and first positive sequence current at a first terminal of a power transmission line are computed based on a first voltage and first current at the first terminal. A second positive sequence voltage and second positive sequence current at a second terminal are computed based on a second voltage and second current. Based on the first positive sequence voltage and the first positive sequence current, a first junction voltage and first junction current from the first terminal at a junction are computed. Based on the second positive sequence voltage and the second positive sequence current, a second junction voltage and second junction current from the second terminal are computed. A ratio of a junction voltage parameter to a junction current parameter is computed. Using the ratio, the faulty section is identified.