Current-Only Directional Overcurrent Protection for Distribution Automation: Challenges and Solutions

Ukil, Abhisek; Deck, Bernhard; Shah, Vishal H

doi:10.1109/tsg.2012.2208127

Cited by 73 publications

(45 citation statements)

References 16 publications

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“…(ii) Directional over-current relays (67): Directional overcurrent protection principles use both current and voltage parameters; or only current [16]; or only post-fault currents and no need of voltages and pre-fault currents [17].…”

Section: Fault Protection Of Ac Trunk Lines and Common Buses (Withoutmentioning

confidence: 99%

Available Fault Protection Methods of Ungrounded AC Microgrids Evaluated by Transient Simulation Results

Lien¹,

Bùi²,

Chang³

et al. 2016

IJCEE

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This paper evaluates fault protection methods of ungrounded low-voltage (LV) AC microgrids (MGs) based on transient simulation results of a typical ungrounded LVAC microgrid. By considering operation characteristics of ungrounded MGs and a literature review on existing MG fault protection solutions in recent years, possible fault protection methods are proposed for an ungrounded AC MG. Transient simulation results of an ungrounded AC MG are obtained by line-to-line (LL) and line-to-ground (LG) faults, and operation transition tests of the microgrid between autonomous and grid-connected operation modes. Based on the simulation results, advantages and disadvantages of each ungrounded microgrid protection solution are highlighted. In order to get the optimal fault protection, combinations among some or all of possible fault protection solutions of an ungrounded LVAC microgrid are found out. As a result, main contributions of the paper contain: (i) proposing and analysing available fault protection solutions of ungrounded LVAC MGs, (ii) doing the transient simulations of a typical ungrounded microgrid under different disturbance cases, and (iii) suggesting the necessary combinations among proposed fault protection solutions of ungrounded MGs.

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Section: Fault Protection Of Ac Trunk Lines and Common Buses (Withoutmentioning

confidence: 99%

Available Fault Protection Methods of Ungrounded AC Microgrids Evaluated by Transient Simulation Results

Lien¹,

Bùi²,

Chang³

et al. 2016

IJCEE

View full text Add to dashboard Cite

show abstract

“… Directional over-current relays (67): Directional overcurrent protection principles use both current and voltage parameters; or only current [6]; or only post-fault currents and no need of voltages and pre-fault currents [7].…”

Section: Main Protectionmentioning

confidence: 99%

Transient Responses and Appropriate Fault Protection Solutions of Uni-grounded AC Microgrids

Lien¹,

Bùi²,

Chang³

et al. 2016

IJCEE

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This paper simulates transient situations of a uni-grounded low-voltage (LV) AC microgrid through various fault tests and operation transition tests between grid-connected and islanded modes of the uni-grounded microgrid. Based on transient simulation results, available fault protection methods are proposed for main and back-up protection of a uni-grounded AC microgrid. As a result, main contributions of the paper are: (i) analysing transient responses of a uni-grounded LVAC microgrid through line-to-line faults, line-to-ground faults, three-phase fault and microgrid operation transition tests; and (ii) proposing available fault protection methods for uni-grounded microgrids, such as: non-directional or directional overcurrent protection, under/over voltage protection, differential protection, voltage-restrained overcurrent protection, and other protection principles not based on phase currents and voltages (e.g. total harmonic distortion detection of currents and voltages, using sequence components of current and voltage, 3I0 or 3V0 components).

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“…In spite of its simplicity, this protection scheme has a main drawback: power supply on a feeder will be totally interrupted following a fault event on the feeder. To isolate more effectively the faulty part of networks and thus reduce the number of customer interruptions, more relays and breakers may be installed along feeders [1][2][3][4][5]. In the context of smart grid, this protection scheme can be achieved through communication links between dispatched relays and a control centre [3].…”

Section: Introductionmentioning

confidence: 99%

Directional relays without voltage sensors for distribution networks

Petit

2014

IET Generation, Transmission & Distribution

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International audienceIn this study, algorithms for directional relays using only current measurements are presented. Developed for radial distribution networks, these algorithms will determine fault direction based on ratios between variations of sequence currents during and before faults: ΔI 2/ΔI 0 ratio for line-to-ground faults and the ΔI 2/ΔI 1 ratio for line-to-line faults. The ratios are used as input of a support vector machine classifier, which was trained beforehand thanks to simulation tools. The classifier classifies ratios into two categories, according to the fault location: upstream or downstream towards the relay. Test results from simulations show good performances of the algorithms in most cases, with the presence of different distributed generation technologies. Moreover, impact of certain factors on algorithms, such as measurement errors, high-impedance faults or network reconfiguration, is studied. Finally, the implementation of algorithms is also discussed

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Current-Only Directional Overcurrent Protection for Distribution Automation: Challenges and Solutions

Cited by 73 publications

References 16 publications

Available Fault Protection Methods of Ungrounded AC Microgrids Evaluated by Transient Simulation Results

Available Fault Protection Methods of Ungrounded AC Microgrids Evaluated by Transient Simulation Results

Transient Responses and Appropriate Fault Protection Solutions of Uni-grounded AC Microgrids

Directional relays without voltage sensors for distribution networks

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