Simple fault path indication techniques for earth faults

Lehtonen, Matti; Siirto, Osmo; Abdel-Fattah, Mohamed F.

doi:10.1109/pq.2014.6866844

Cited by 11 publications

(8 citation statements)

References 1 publication

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“…Detailed descriptions of the research with simple earth fault indicators and automatic fault management are in [11,12]. These development steps are supporting the concept of self healing city networks.…”

Section: Future Smart Grid Concept In Helsinkimentioning

confidence: 75%

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Improving reliability in an urban network

Siirto¹,

Hyvärinen²,

Loukkalahti³

et al. 2015

Electric Power Systems Research

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Section: Future Smart Grid Concept In Helsinkimentioning

confidence: 75%

“…This paper describes and integrates the analyses and the results of the applications of the methods presented in previous papers [8][9][10][11][12]. The main contribution is to create a comprehensive reliability improvement solution for urban distribution networks utilizing modern technologies and models.…”

Section: Introductionmentioning

confidence: 99%

Improving reliability in an urban network

Siirto¹,

Hyvärinen²,

Loukkalahti³

et al. 2015

Electric Power Systems Research

Self Cite

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“…In References [17][18][19][20], earth fault location using zero sequence components is proposed. Despite the simplicity this approach offers, it suffers from a shortcoming i.e., false indication in networks where the length of the faulty feeder is long and the fault occurs close to the beginning of the feeder.…”

Section: Introductionmentioning

confidence: 99%

“…One solution is to utilize neutral voltage measurement, in addition to current measurement. However, this neutral voltage measurement is not usually preferred at the MV side due to additional costs [18]. Therefore, there is a need for an earth fault indication method which is based on current measurement only.…”

Section: Introductionmentioning

confidence: 99%

Earth Fault Location Using Negative Sequence Currents

2019

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In this paper, a new method for locating single-phase earth faults on non-effectively earthed medium voltage distribution networks is proposed. The method requires only current measurements and is based on the analysis of the negative sequence components of the currents measured at secondary substations along medium voltage (MV) distribution feeders. The theory behind the proposed method is discussed in depth. The proposed method is examined by simulations, which are carried out for different types of networks. The results validate the effectiveness of the method in locating single-phase earth faults. In addition, some aspects of practical implementation are discussed. A brief comparative analysis is conducted between the behaviors of negative and zero sequence currents along a faulty feeder. The results reveal a considerably higher stability level of the negative sequence current over that of the zero sequence current.

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“…Therefore, phase-comparison schemes, for example in [7], can be compromised. Approaches based on variation of current magnitudes, for instance due to alternating of compensation rate presented in [8], might be inadequate in networks with cables or can lose sensitivity in case of high impedance faults. Alternative methods, for example based on calculation of zero sequence admittances [9], require pre-fault information, and settings depend on network configuration.…”

Section: Introductionmentioning

confidence: 99%

Fast protection against islanding and unwanted tripping of distributed generation caused by ground faults

Pandakov

Høidalen

Marvik

2017

CIRED - Open Access Proceedings Journal

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Ground faults (GF) in a feeder with interconnected distributed generation (DG) might lead to overvoltages in healthy phases even after feeder disconnection from a substation, obstacles for reclosing schemes, and safety hazards. It requires urgent disconnection of DG to prevent islanding. On the other hand, fast location of GF in compensated networks is a difficult task and finding of the correct fault location is necessary in order to decrease a number of undesirable DG decoupling. The current paper proposes a communication-based scheme preventing islanding forming in a system. The scheme utilizes a new fast and universal indicator revealing fault positions. A locating algorithm is also applied to restrict unwanted disconnection of DG. The method is tested on a model in PSCAD/EMTDC of an actual 22 kV multiterminal grid grounded by a Petersen coil and including DG. The results show that the new indicator can reliably discriminate faults in the system. It has been found that precision of the locator utilizing two-point measurements is not sufficient and might lead to nuisance tripping of the DG. Using of multi-point measurements and the proposed indicator helps to solve this problem for a complex feeder topology. Finally, the same signals can be applied to enhance accuracy of the locator.

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Simple fault path indication techniques for earth faults

Cited by 11 publications

References 1 publication

Improving reliability in an urban network

Improving reliability in an urban network

Earth Fault Location Using Negative Sequence Currents

Fast protection against islanding and unwanted tripping of distributed generation caused by ground faults

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