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Jahanger, Hayder Kadhim Jahanger (2019) A practical investigation of wideband impedance based fault location technologies. PhD thesis, University of Nottingham.

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Abstract

This thesis presents a thorough investigation of newly developed impedance-based estimation techniques that use the fault generated transient in order to locate faults in Integrated Power Systems (IPS) or Microgrids such as those existing in modern ships and aircraft. The methods studied use the high frequencies generated by the fault.

Two new fault location techniques are investigated. A double-ended and a single-ended technique. The double-ended technique needs the voltage and current measurements from two ends of the protected cable. The single-ended technique needs the measurements from only one end. The double-ended method uses a simple algorithm, and it has a high accuracy. However, the technique has no ability to locate the fault on any tapped lines. The technique is demonstrated using simulation and experimental investigation. The single-ended technique needs assumptions to be made and requires an iteration process to minimise the error caused by the assumptions. This method is able to estimate the fault distance on the main cable or tapped lines. However, it has no ability to discriminate between the two possible fault locations. The simulation tests have shown an excellent result while the experimental tests have shown that the technique is adversely affected by shape of the fault transient, and therefore a modification to the single-ended method is proposed and validated, to address this issue.

The advantages and limitations of both techniques are presented using different system conditions. The advantage of combining both methods in order to locate a fault on a tapped line is presented. A major limitation is the effect of a high number of tapped loads which require compensation. Therefore, both techniques are developed to consider tapped load compensation. Both the simulation and the experimental results validate the proposed changes. Furthermore, the addition of an inverter-based Distribution Generation (DG) has a limited effect on both techniques. It is shown that a DG source supplying 50% of the system load increases the error by 4% in the worst case.

Item Type:	Thesis (University of Nottingham only) (PhD)
Supervisors:	Sumner, Mark Thomas, David
Keywords:	Wideband Impedance Based Fault location; Electric fault location; Transients (Electricity); Impedance (Electricity);
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3001 Distribution or transmission of electric power
Faculties/Schools:	UK Campuses > Faculty of Engineering
Item ID:	59400
Depositing User:	Jahanger, Hayder
Date Deposited:	19 Sep 2023 12:10
Last Modified:	19 Sep 2023 12:10
URI:	https://eprints.nottingham.ac.uk/id/eprint/59400

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