Resonant grounding (ground fault neutralizer) of a unit connected generator

Khunkhun, K.; Koepfinger, J. L.; Haddad, Majed

doi:10.1109/t-pas.1977.32365

Cited by 27 publications

(4 citation statements)

References 2 publications

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“…The study carried out in ref. [13] shows the advantage of the resonant grounding over resistor grounding (which has been a popular grounding technique for a while). A systematic review of the flexible grounding technique to compensate the fault current due to the high impedance single‐phase to ground fault is carried out in ref.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review of control techniques for compensating the fault current in resonant grounded distribution networks: From the perspective of mitigating powerline bushfires

Fernando

Mahmud

Islam

et al. 2022

IET Generation Trans & Dist

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Powerline faults are responsible for major bushfires around the world where arcs provoked from ground faults are common causes for igniting such fires. The grounding techniques (mainly resonant grounding) used in distribution substations and arc suppression devices play a crucial role for compensating fault currents in order to extinguish arcs so that the likelihoods of powerline bushfires are significantly reduced. Though passive arc suppression devices (e.g. Petersen coils) are extensively used for compensating the reactive component of the fault current, the active component of this current is still large enough to ignite the fire in bushfire prone areas for which active arc suppression devices are recently used. These active arc suppression devices incorporate residual current compensation inverters and the full compensation of the fault current rely on the control scheme of these inverters. This paper comprehensively reviews different control schemes that are used for compensating the fault current in resonant grounded power distribution systems. The existing control schemes are discussed in terms of the model used during the controller design process, loop structures, control block diagrams, and performance analysis frameworks (i.e. the type of fault impedances). It is worth mentioning that faults on resonant grounded power distribution networks exhibit the characteristics of high impedance faults and it important to consider this aspect for performance analysis of the control scheme. This paper also covers a brief overview of different grounding techniques used for mitigating fault currents and finally, the challenges with the existing controllers are identified in terms of extinguishing powerline bushfires. The comprehensive review motivates and guides future research activities on developing more efficient fault compensation techniques.

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Section: Introductionmentioning

confidence: 99%

A comprehensive review of control techniques for compensating the fault current in resonant grounded distribution networks: From the perspective of mitigating powerline bushfires

Fernando

Mahmud

Islam

et al. 2022

IET Generation Trans & Dist

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“…Note that the ZSC's 5-harmonic inductance is 5 times greater than base wave's inductance, contrarily, 5-harmonic's capacitance is 5 times smaller than base wave's capacitance, and then 5-harmonic's inductance can be seen as opened at this time, thus, the direction of 5-harmonic current of fault line is opposite to the others too, that is, its phase is 900 behind of U0 , just as shown in Fig.3 Q 3UOIO sin y (5) In the NES, the arc-suppression coil usually runs in over-compensation condition, that is, IL is a little greater than 3 I of I's capacitance component, which situates the right of U0 's axis, and then od and of's direction are same.…”

mentioning

confidence: 96%

“…Because the harmonic .0 ->[--is higher, the virtual value is smaller, it is better to use the 5-harmonic method when the single-phase grounding fault occurred in the NES. The disadvantage is its low sampling accuracy in the field [5].…”

mentioning

confidence: 99%

“…Ppower VIiu/Q//i] [Z Viu/([5] present respectively the ZSP subjection function detection values mf line 1 to line, AfO] present the coeffkicnt of criterion. PoMiu[1[1] [Miu[/][5 ] present respectively the BP subjection function detection values of line i to line3, AfJ] present the coefficient ofMiu[1M[5] present respectively the RCI subjection function detection values of line I to line3, AfJ] present the coefficient of criterion. PTOtaI FaultPO FaultP3 present respectively the last probability values of line 1 to line 3, and the line with the max probability is fault line.…”

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confidence: 99%

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Research on the novel comprehensive fault line selection method for the NUGS based on the fuzzy theory

Zhou

Jun-jia²,

Li³

et al. 2006

2006 International Conference on Power System Technology

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Because of line parameters, running types, fault grounding impedances and other factors, the veracity of current fault line selection(FLS) method is not high enough and may contain some dead areas for FLS device of non-utility grounding system(NUGS). To overcome this shortage, a novel FLS method is proposed in this paper based on analyzing the fault characters of distribution network, combining merits of prevalent FLS methods, constructing these methods' subjection functions and then synthesizing them based on the fuzzy theory. Experiments show this method can achieve high sensitivity, adjustability and veracity. The dynamic simulation experiment shows in the neutral un-grounding system(NUS), the method which is made of the zero sequence inactive power (ZSIP) method, the base-wave virtual value(BV) method and the basewave phase (BP) method of zero sequence current(ZSC) can achieve high accuracy; in the neutral resonant grounding system(NES), the method that combines zero sequence active power(ZSAP) method, 5-harmonic phase(HP) method and remaining current increment(RCI) method can even achieve 100% accuracy. Based on the PC104 industry control computer, a new FLS device of NUGS according to this new FLS shows very high accuracy in dynamic simulation experiments, and it should be widely used in China.Index Term fault line selection(FLS), non-utility grounding system(NUGS), dynamic simulation experiment, neutral ungrounding system(NUS), neutral resonant grounding system(NES)

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Advances on fault detection techniques for resonant grounded power distribution networks in bushfire prone areas: Identification of faulty feeders, faulty phases, faulty sections, and fault locations

Pirmani

Mahmud

2023

Electric Power Systems Research

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Resonant grounding (ground fault neutralizer) of a unit connected generator

Cited by 27 publications

References 2 publications

A comprehensive review of control techniques for compensating the fault current in resonant grounded distribution networks: From the perspective of mitigating powerline bushfires

A comprehensive review of control techniques for compensating the fault current in resonant grounded distribution networks: From the perspective of mitigating powerline bushfires

Research on the novel comprehensive fault line selection method for the NUGS based on the fuzzy theory

Advances on fault detection techniques for resonant grounded power distribution networks in bushfire prone areas: Identification of faulty feeders, faulty phases, faulty sections, and fault locations

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