Accurate Fault Location Principle By Means Of Projection Operator for Distributed Parameter Transmission Lines

2006 ◽  
Author(s):  
Ha HengXu ◽  
Zou BenGuo ◽  
Wang Jing ◽  
Wang Lei ◽  
Chen Bo ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Projection Operator ◽  
Fault Location ◽  
Distributed Parameter ◽  
Parameter Transmission

scholarly journals Parametric Fault Diagnosis of Very High-Frequency Circuits Containing Distributed Parameter Transmission Lines

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 550
Author(s):  
Michał Tadeusiewicz ◽  
Stanisław Hałgas
Keyword(s):  
Fault Diagnosis ◽  
Transmission Lines ◽  
High Frequency ◽  
Diagnostic Method ◽  
Distributed Parameter ◽  
Very High Frequency ◽  
Parametric Fault ◽  
The One ◽  
Very High ◽  
Parameter Transmission

Parametric fault diagnosis of analog very high-frequency circuits consisting of a distributed parameter transmission line (DPTL) terminated at both ends by lumped one-ports is considered in this paper. The one-ports may include linear passive and active components. The DPTL is a uniform two-conductor line immersed in a homogenous medium, specified by the per-unit-length (p-u-l) parameters. The proposed method encompasses all aspects of parametric fault diagnosis: detection of the faulty area, location of the fault inside this area, and estimation of its value. It is assumed that only one fault can occur in the circuit. The diagnostic method is based on a measurement test arranged in the AC state. Different approaches are proposed depending on whether the faulty is DPTL or one of the one-ports. An iterative method is modified to solve various systems of nonlinear equations that arise in the course of the diagnostic process. The diagnostic method can be extended to a broader class of circuits containing several transmission lines. Three numerical examples reveal that the proposed diagnostic method is fast and gives quite accurate findings.

A New PMU-Based Fault Location Algorithm for Three-Terminal

2013 ◽  
Vol 634-638 ◽  
pp. 3925-3929
Author(s):  
Hong Yu Shen ◽  
Wen Jun Zhang ◽  
Yu Bo Duan ◽  
Jian Jun Xu
Keyword(s):  
Fault Zone ◽  
Transmission Lines ◽  
Fault Location ◽  
Measurement Data ◽  
Data Synchronization ◽  
Distributed Parameter ◽  
Matlab Simulation ◽  
Location Method ◽  
Terminal System ◽  
Location Algorithm

Existing two-terminal fault location method can not be directly applied to the three-terminal transmission lines, this paper presents a new PMU-based fault location algorithm for three-terminal transmission lines. The development of the algorithm takes advantage of PMU measurement data synchronization, uses distributed parameter line model, first of all judging the fault zone after a failure, uses Thevenin's Theorem to merge the non-slip fault, so the three-terminal system is simplified the two-terminal system, Then we can use the two-terminal fault location principle of fault location. Through MATLAB simulation shows the correctness of the algorithm.

Fault Location for Parallel Transmission Lines with Limited Voltage and Current Measurements

2013 ◽  
Vol 14 (3) ◽  
pp. 265-274
Author(s):  
Wanjing Xiu ◽  
Yuan Liao
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Fault Location ◽  
Optimal Estimation ◽  
Positive Sequence ◽  
Distributed Parameter ◽  
Simulation Studies ◽  
Parallel Transmission ◽  
Location Algorithm ◽  
Location Estimate

Abstract This article presents a novel fault location algorithm for parallel transmission lines for scenarios where only limited synchronized voltage and current measurements are available. Existing methods usually request measurements at the faulted line to be available. However, this may not always be the case due to the limited number of recording devices placed in a power system. The proposed method makes the most of available measurements and does not require the measurements to be captured from the faulted line. The pre-fault and during-fault bus impedance matrices for the positive-sequence network are derived. Synchronized bus voltages and branch currents are then expressed as a function of fault location and line parameters. As a result, fault location can be estimated using the obtained measurements. The distributed parameter line model is adopted to fully consider the shunt capacitances of the line. To eliminate the influence of bad measurements, optimal estimation theory is adopted for enhanced accuracy of the fault location estimate. Simulation studies have been carried out based on a 27-bus power system, and encouraging results have been achieved.

A New Practical Fault Location Algorithm for Two-Terminal Transmission Lines

2011 ◽  
Vol 383-390 ◽  
pp. 4377-4384
Author(s):  
Zhou Ma ◽  
Xiao Ning Li ◽  
Xiao Ming Zhang
Keyword(s):  
Transmission Line ◽  
Real Time ◽  
Transmission Lines ◽  
Fault Location ◽  
Distributed Parameter ◽  
The Real ◽  
Three Phase ◽  
Transition Resistance ◽  
Location Algorithm ◽  
Real Time Transmission

A new practical fault location algorithm using two-terminal electrical quantities is presented in this article, which takes into account the distributed parameter line model. The analytical expression of algorithm derives from Three-Phase decoupling. First, an analytical synchronization of the unsynchronized measurements is performed with use of the determined synchronization operator and the non-synchronizing angle is calculated with the two-terminal pre-fault electrical quantities. Then, the real-time transmission line parameters are calculated using two-terminal non-synchronized electrical quantities and the non-synchronizing angle. The algorithm overcomes the drawbacks of the traditional fault location algorithms, which does not exist the pseudo-root problem. Besides, it has the advantages of simple, practical, litter computation, no need to search and iterative and robustness. The algorithm has not influenced by fault types, the transition resistance and other factors. At last the developed fault location algorithm is tested using signals of ATP-EMTP versatile simulations of faults on a transmission line.

A New Single-Ended Fault Location Method Based on Bergeron Model

2012 ◽  
Vol 433-440 ◽  
pp. 2939-2944
Author(s):  
Jian Bo Xin ◽  
Xiang Ning Lin ◽  
Zhi Qian Bo
Keyword(s):  
Transmission Line ◽  
Phase Angle ◽  
Transmission Lines ◽  
Fault Location ◽  
Distributed Parameter ◽  
Phase Voltage ◽  
Location Method ◽  
Distributed Parameter Model ◽  
Location Algorithm ◽  
The Impact

On EHV transmission lines, the impact of distributed capacitance is necessary to be considered in case of fault location. A novel fault location method for single-phase grounded fault of transmission lines is presented based on the distributed parameter model of transmission line. In this method only the voltage and current of single end is used. The residual phase voltage at the fault point should have the same phase angle as the current through fault branch due to the pure resistive characteristics of the fault path impedance. By virtue of searching the minimum phase angle differ-ence between the phase voltage along the transmission line and the fault-component current meas-ured at the side equipped with protection, the fault distance can be located. ATP simulations are used to generate data that are supplied as inputs to the fault location algorithm.

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