Review of methodologies for earth fault indication and location in compensated and unearthed MV distribution networks

Farughian, Amir; Kumpulainen, Lauri; Kauhaniemi, Kimmo

doi:10.1016/j.epsr.2017.09.006

Cited by 55 publications

(44 citation statements)

References 19 publications

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“…This means that NTP states that client's clock is always behind even though this is not the case. This is what happens according to (1 ) and 2, if the latency from the server to the client is in reality always shorter than the latency from the client to the server. If the reported offset is say 10ms, the downlink latency (from the base station to the client device) is 20 ms shorter than the uplink latency.…”

Section: B Evaluating Ntp In 4g/lte Cellular Networkmentioning

confidence: 86%

“…Applications like monitoring temperatures and vibrations of transformers and other smart grid assets, do not require very high timing accuracy. But for some applications, like distributed fault location [1], a submillisecond level timing would be preferable. In a 50 Hz network having fundamental period of 20 ms timing misalignment of 0,1ms corresponds to 1,8 degrees in voltage or current values.…”

Section: Smart Grid Challengesmentioning

confidence: 99%

“…URLLC would also set an upper limit for NTP timing error. Assuming the extreme situation that downlink latency would be 0 ms and downlink 1 ms, the error would be 0,5 ms according to (1) and (2). This could ultimately enable a submillisecond level timing to UEs.…”

Section: Currentmentioning

confidence: 99%

See 2 more Smart Citations

Providing Network Time Protocol Based Timing for Smart Grid Measurement and Control Devices in 5G Networks

Borenius

Costa-Requena

Lehtonen

et al. 2019

2019 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm)

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Smart grids are key enablers for creating sustainable energy systems. On the other hand, they introduce a grid management challenge as power grids become more complex and dynamic. Evolving power grids towards smart grids requires combining electric energy technology with communications and information technology. In a distributed network, time synchronization is often one central question. This paper studies limitations of utilizing the widely used Network Time Protocol (NTP) in current 4G cellular networks for smart grid management. As a specific contribution, an improved, NTP based clock adjustment algorithm is proposed to provide more accurate timing information. Finally, the paper studies capabilities of emerging 5G cellular networks to further improve accuracy of timing provided to user equipment (UE).

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Section: B Evaluating Ntp In 4g/lte Cellular Networkmentioning

confidence: 86%

Section: Smart Grid Challengesmentioning

confidence: 99%

See 1 more Smart Citation

Providing Network Time Protocol Based Timing for Smart Grid Measurement and Control Devices in 5G Networks

Borenius

Costa-Requena

Lehtonen

et al. 2019

2019 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm)

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“…There is a significant array of sources that investigate the protection of power supply systems against single-phase earth faults. A large number of reviews of publications on the considered problem [1][2][3][4] are evidence that the topic of protection against singlephase earth faults today remains a serious challenge for both scientific and theoretical research and engineering and practical developments. In particular, the new methods of signal processing and analysis that have been developed in connection with the development of modern communication systems remain not fully implemented.…”

Section: для электрических сетей напряжением 6-35 кв работающих с коmentioning

confidence: 99%

Improving the Efficiency of Fault Protection Systems of Electrical Grids Based on Zero Sequence Voltages and Currents Wavelet Transforms

Syvokobylenko¹,

Лысенко²

2020

Electrical Engineering &Amp; Electromechanics

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Introduction. A significant proportion of earth faults in medium voltage networks represents a short-lived and transient process. Problem. In such cases, earth fault protection that responds to steady-state current and voltage is not able to operate properly. Purpose. To develop earth faults protection selective algorithm using transient components, that occur in zero-sequence currents and voltage in the fault process. Method. A mathematical model of the power supply system was applied to study the transient components of currents and voltage of zero sequence in compensated electrical networks with phase-to-earth faults, and a those model also is used to test the operation of the developed protection algorithm. The results showed that, the reactive power for transient components, of the frequency greater by 4-6 times, than fundamental frequency, which are extracted from the current and voltage of zero sequence by wavelet transform in compensated electrical networks on the damaged feeder, is positive regardless of the degree of compensation of the capacitive current. That may be the basis of the principle of directional protection. Originality. Phase-to-earth fault selective protection algorithm has been developed. In that algorithm, first derivatives of currents and voltages of zero sequence are found, to reduce the influence of aperiodic components. And then, by using of the wavelet transform with Morlet mother function, an orthogonal components are extracted from them. Reactive power is calculated for transient component. If that reactive power excess of threshold, the relay will make a decision. The reliability of the developed protection algorithm is confirmed by the results of mathematical modelling and verification of the test sample at the laboratory stand and by means of field signals that were recorded by digital loggers at the substations. References 10, figures 5.

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“…However, a number of methods have been put forward to address this matter. A comprehensive review of the state-of-the-art methods for locating single-phase earth faults in medium voltage (MV) distribution networks is provided in Reference [1].…”

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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Review of methodologies for earth fault indication and location in compensated and unearthed MV distribution networks

Cited by 55 publications

References 19 publications

Providing Network Time Protocol Based Timing for Smart Grid Measurement and Control Devices in 5G Networks

Providing Network Time Protocol Based Timing for Smart Grid Measurement and Control Devices in 5G Networks

Improving the Efficiency of Fault Protection Systems of Electrical Grids Based on Zero Sequence Voltages and Currents Wavelet Transforms

Earth Fault Location Using Negative Sequence Currents

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