Power systems frequency estimation using amplitude tracking square wave for low-end protective relays

Ukil, Abhisek; Yeap, Yew Ming; Satpathi, Kuntal

doi:10.1016/j.measurement.2019.03.068

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…The fault detection scheme consists of a relay that detects a fault in one of two power system zones separated by a circuit breaker and initiates tripping of that circuit breaker. However, it does not represent the fault detector function of breaker failure [87,88].…”

Section: Transient Fault Protection Systemmentioning

confidence: 99%

Transient Fault Detection and Location in Power Distribution Network: A Review of Current Practices and Challenges in Malaysia

et al. 2021

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An auto-restoration tool to minimize the impact of faults is one of the critical requirements in a power distribution system. A fault-monitoring system is needed for practical remote supervision to identify faults and reduce their impacts, and thus reduce economic losses. An effective fault-monitoring system is beneficial to improve the reliability of a protection system when faults evolve. Therefore, fault monitoring could play an important role in enhancing the safety standards of systems. Among the various fault occurrences, the transient fault is a prominent cause in Malaysia power systems but gains less attention due to its ability of self-clearance, although sometimes it unnecessarily triggers the operation of protection systems. However, the transient fault is an issue that must be addressed based on its effect that can lead to outages and short-circuits if prolonged. In this study, the authors summarize the guidelines and related standards of fault interaction associated with a monitoring system. The necessity of transient fault detection and location techniques and their limitations, the need for signal processing, as well as recommended practices, are also discussed in this paper. Some of the practices from local power utility are also shared, indicating the current approaches, key challenges, and the opportunities for improvement of fault-monitoring systems due to transient fault, which can be correlated with the reviews provided.

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Section: Transient Fault Protection Systemmentioning

confidence: 99%

Transient Fault Detection and Location in Power Distribution Network: A Review of Current Practices and Challenges in Malaysia

et al. 2021

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“…This, in turn, worsens the technical and economic indicators of the work of many units and harms the population and personnel servicing the main and auxiliary production. It is necessary to rationalize, improve the efficiency and reliability of relay protection and automation in the electrical networks of MMPP [16,19,22].…”

mentioning

confidence: 99%

Improving the efficiency of relay protection at a mining and processing plant

Klyuev

Босиков

Гаврина

2021

PMI

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The paper presents the results of constructing effective relay protection in the power supply system of a mining and processing plant (MPP). A brief description of the MPP is given, the power supply and substitution circuits used to calculate the short-circuit currents are given. A statistical analysis of failures in the electric network of the MPP has been carried out, which makes it possible to draw conclusions about the nature of failures ranges. Analysis of the registered faults shows that a significant part of them are line-to-earth faults, which in most cases turn into multiphase short circuits, which are interrupted by overcurrent protection. In order to improve the efficiency and reliability of the relay protection, the power supply scheme of the MPP was refined and analyzed. The calculation of the short-circuit currents was made, which made it possible to calculate the settings of the relay protection and give recommendations on the place of its installation and adjustment in order to ensure the normal operation of electricity consumers. To reduce the number of failures to the cable insert on the line leaving the administrative and household complex (AHC), and to increase the reliability of power supply to consumers, it is advisable to divide the capacities of the existing 10 kV line into two parallel ones by laying a second line. It is recommended to install a current cut-off on the line outgoing to the AHC, the feasibility of the installation of which was shown by calculations. This will reduce the chance of failures to the cable gland. Data on the setting currents of overcurrent protection and current cut-off are given on the selectivity card.

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