This paper proposes an improved noniterative fault location method on untransposed transmission lines without utilizing line parameters. Two-end three phase voltage and current phasor measurements before during the are typically required. First, parameter-free problem is formulated through multi-section models, necessary condition of solutions carefully investigated to determine maximum possible section number model. Afterwards, with determined number, analytical solution derived full...

This paper proposes a novel phasor domain fault location method for two or three terminal double-circuit transmission lines sharing the same tower without requiring line parameters. First, models of and with faults are derived. The fully consider mutual coupling between circuits, distributed parameters, asymmetry structures, extensive types. Through modeling procedure, location, unsynchronized phase angle, resistance other internal states introduced as unknown variables, resulting in highly...

Fast and accurate fault location methods can save costs ensure power supply reliability. This paper proposes a novel noniterative single-ended phasor domain method with distributed parameter model for AC transmission lines. Due to the limitation of information, legacy impedance-based usually are based on assumptions line or system obtain more information. The proposed in this takes advantage additional information brought by operation mode circuit breakers. only needs local measurements does...

This paper proposes an unsynchronized two-terminal fault location method on three phase practically transposed transmission lines. Compared to the existing methods, proposed considers asymmetry of lines during in practice. First, constructs by connecting untransposed line sections. For each section, fully distributed parameters model is adopted ensure modeling accuracy. According physical laws that should obey, angle estimated with analytical formulation before fault. Next, closed-form...

This paper proposes a generalized discrete Fourier transform (DFT) based dc offset mitigation method to improve the accuracy of phasor estimation during faults. The DFT is applied signal and results are separated into multiple sets, where each set contains information both fundamental frequency component decaying de signal. formulation enhances redundancy problem. Afterwards, as unknown be estimated state procedure adopted solve this proposed provides framework for with full consideration...

This paper proposes a parameter-free fault location algorithm on untransposed transmission lines. Synchrophasor voltage and current measurements at both terminals of the line before during faults are typically required. The method first builds models fault, which describe all physical laws that should obey. as well parameters introduced unknown variables in models. Afterwards, is obtained by accurately solving Compared to existing methods lines, proposed fully considers lumped shunt...

With more renewable energy integrated to the grid in form of inverter based resources (IBRs), traditional current-based fault phase selector encounters limitations. The causes this problem are weak infeed feature and variation source impedance IBRs. This paper proposes an improved selection scheme solve problem. Firstly, reasons for failure methods analyzed. Then, compound proportion criterion including voltages currents is established. proposed mitigates effects weak-infeed caused by...

As renewables are increasingly connected to the grid through inverters, inverter based resources (IBRs) affect performance of line distance protection and cause mal-operation relays. This paper proposes an improved scheme on dynamic trip region. The key idea is adjust region relay in real time ensure proper operation First, limitation traditional presented. Second, with different fault types, locations resistances, expression apparent impedance derived as functions measured...

This paper derives the systematic way to select phase-mode transformation matrices for 3 phase symmetrical power systems. First, presents basic conditions matrix, ensure complete decoupling of three phases. Second, additional objectives are introduced simplify design during protection/fault location applications, such as a fixed nonzero row fault admittance matrix all types, independence specific mode with respect other modes faults, and zero rows/columns types. Third, meet each objective...

This paper proposes an iterative parameter-free fault location algorithm on three-terminal untransposed transmission lines. Three phase voltage and current synchrophasor measurements at three terminals of the line before during are typically required. The proposed method considers lumped shunt capacitance does not require any assumption tower structure. first builds models faults, which describe all physical laws that should obey. Meanwhile, parameters as well introduced unknown variables....

This paper proposes a parameter-free method to locate faults in untransposed transmission lines with asymmetrical tower structures. Best implementation requires synchrophasor voltage and current measurements at both terminals of the line. First, physical laws that line should obey before during are described phasor domain, where fault location as well parameters introduced an unknown variables. Afterwards, can be directly solved without knowing exact values parameters. Compared...

Based on the harmonics within power system, in this paper, a phasor domain single-ended transmission line fault location method is proposed. The does not require communication channels from remote terminal, and works without side voltages, currents, or source impedances. First, apparent impedance at fundamental frequency seen by relay local terminal presented. Second, with an example harmonic, additional information introduced to problem, resulting 4 real equations unknowns. Finally,...

This paper proposes two single-ended fault location methods for cable - overhead line (OHL) hybrid transmission lines. Three phase voltage and current phasors at only the local terminal are required. First, well-known Eriksson method is modified as proposed 1, to improve performance in this situation, where lumped parameter model adopted. Afterward, fully distributed considered 2, further enhance accuracy of model; can be solved via Newton's iterative methods. In numerical experiments,...

Synchronized measurements within a power network are of great importance to enable extensive applications such as monitoring, operation, protection, fault location, and controls. However, measurement synchronization through satellite is not always available in practical systems. To this end, paper proposed virtual technique for terminals transmission lines, without the requirement line parameters. Unsynchronized voltage current at two-terminals required. The key idea describe physical laws...