A new fault location algorithm for EHVAC mixed cable-overhead line based on fault zone identification

Cheng, Yuting; Li, Y. L.; Li, B. T.; Yi, Hongyu; Hu, Yuewei; Li, W. G.

doi:10.1109/isgt-asia.2012.6303384

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…It is clear that the first wave arrives at t 1 = 0.124301 s, the second wave wave arrives at t 2 = 0.124889 s, the current polarity of these two waves are different, and the time difference t 2 − t 1 is lower than the value of L l /v l , so the fault point is located in the right half of the overhead line, and the wave arrived at t 2 is reflected from bus B i . The distance of fault point to B i is calculated in (9)…”

Section: Faults In Segment 3 For Faults In Segment 3mentioning

confidence: 99%

“…This paper focuses on the fault location of mixed transmission systems. In [9], the authors used a cable-overhead line connection point as the reference, deducted fault point positioning functions in different segments, and obtained the position of the fault point based on a searching or calculating method; however, it has a high requirement for two-terminal data synchronization and phasor calculation accuracy. In [10], a novel method that makes use of the robustness of a distance relay and the accuracy of a travelingwave fault locator was presented.…”

Section: Introductionmentioning

confidence: 99%

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A novel fault location algorithm for mixed overhead‐cable transmission system using unsynchronized current data

Ding

Wang

Zheng

et al. 2019

IEEJ Transactions Elec Engng

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The characteristic impedance value of the overhead line is different from that of the underground cable. Existing traveling wave‐based fault location methods for mixed power transmission systems have setbacks including location error caused by wave velocity and difficulty in detecting wave arrival time. In order to solve these problems, the increase of available information from different locations by installing wire‐based sensors along the power line is a feasible solution. In this paper, a traveling wave‐based fault location system, which is based on the current data measured at the midpoint of the overhead line and the joint point, is introduced. The data at these two locations are measured by the wire‐based current sensor we designed. The whole transmission line system is divided by these two sensors into three segments. The first step of this proposed method is to record the postfault current data at the two measuring devices. Second, by comparing the amplitudes and polarities of the current at these two measurement points, the faulty segment can be identified. Finally, postfault wave propagation paths are ascertained; the accurate velocity values of the waves in the overhead line and underground cable are obtained; and then, the fault point is located without the need of time synchronization. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Faults In Segment 3 For Faults In Segment 3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel fault location algorithm for mixed overhead‐cable transmission system using unsynchronized current data

Ding

Wang

Zheng

et al. 2019

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

show abstract

“…In [3], a fault location scheme for mixed transmission lines has been proposed that uses synchronized voltages and currents of the line terminals based on phasor measurements. In this method, the algorithm can identify fault zone and calculate fault location by taking UGC‐OHL junction point as a reference and using different fault point positioning functions based on uniform transmission line equations.…”

Section: Introductionmentioning

confidence: 99%

A novel protection and fault location combined algorithm for mixed/hybrid lines

Aminirad

Shahrtash

2022

IET Generation Trans & Dist

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This paper presents a novel protection and fault location combined algorithm for mixed overhead transmission lines (OHLs) and underground cables (UGCs). The method is based on applying the Morphological Gradient (MG) to the modal component of synchronized measured currents at both ends of the mixed line to detect the transient components generated by the fault. The proposed method utilizes the sign of superimposed components for discriminating internal and external faults and the difference between the times related to these transient components to detect fault location. The method has been evaluated through various simulations, whereas it has a very low computational burden, it is suitable for online applications. Results have shown high performance of the method against different fault inception angles (FIA), fault resistances, fault types, fault locations, combinations of OHL‐UGC, and even current transformer saturation, noise presence, long cable section, and different sheath‐ground connections.

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“…However, in fault location for cable lines, the influence of the experienced wave speed cannot be ignored. In Reference 21, the authors used a junction of hybrid lines as the reference point and deduced the position of the fault in different segments. The authors then obtained the fault location based on a search or calculation method.…”

Section: Introductionmentioning

confidence: 99%

Accurate fault location of hybrid lines in distribution networks

Tian

Yang

et al. 2021

Int Trans Electr Energ Syst

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Fault transient traveling waves in hybrid transmission lines are complex and varied. Hence, this study proposes a method for fault location on the basis of the traveling wave polarity, combining single-ended and double-ended traveling wave ranging algorithms. First, the approximate reflected wave time is calculated based on the distance measured by the double-ended traveling wave ranging algorithms. Then, on the basis of the polarity of the traveling wave, the wave reflected from the point where the fault occurs and the joint point of the hybrid line are accurately identified. Finally, after the reflected wave is accurately identified, the fault is accurately located. In the application of double-ended traveling wave method, variational mode decomposition (VMD) and Teager energy operator (TEO) are used to improve the accuracy of the initial fault distance calculation. The algorithm proposed in this study can ignore the errors caused by the time synchronization and the difficulty in identifying the reflected wave. Simulation results show that the algorithm proposed in this study has high measurement accuracy.

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A new fault location algorithm for EHVAC mixed cable-overhead line based on fault zone identification

Cited by 9 publications

References 3 publications

A novel fault location algorithm for mixed overhead‐cable transmission system using unsynchronized current data

A novel fault location algorithm for mixed overhead‐cable transmission system using unsynchronized current data

A novel protection and fault location combined algorithm for mixed/hybrid lines

Accurate fault location of hybrid lines in distribution networks

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