New principle of busbar protection based on a fundamental frequency polarity comparison

Wu, Hao; Dong, Xingxing; Wang, Qiaomei

doi:10.1371/journal.pone.0213308

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…In addition, the faster processing of WEEE gathered prevents the storage of already collected WEEE, hence reducing waste. In Wu et al [61], safety hazards that are hidden, as well as idleness on the part of workers and devices, are eliminated.…”

Section: Discussionmentioning

confidence: 99%

“…The concept decreases wastage and enhances the productivity, efficiency, and flow of the production process [60]. In Wu et al [61], the just-in-time management concept can help to reduce "the waiting times of workers and equipment". Just-in-time comprises three key objectives, and these are reduction or elimination of every form of inventory, the unmasking of the inefficiencies that exist in the production process, and the application of current production techniques to reduce inefficiencies identified in the process [62].…”

Section: Just-in-time Conceptmentioning

confidence: 99%

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Enhancement of WEEE Management Practices in MTN Phone Village, Rumukurushi, Port Harcourt, Nigeria

et al. 2021

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Informal recycling has been a source of challenges to a mobile telephone network (MTN) phone village in Rumukurushi, Port Harcourt, Nigeria, and several locations in developing countries. In order to bring a lasting solution to the menace of informal recycling in this location, the study proposed a new waste electrical and electronic equipment (WEEE) management system. The system comprises the application of two key concepts. The first concept includes limiting the activities of informal recyclers to WEEE collection only. This implies WEEE treatment, dismantling, etc., are carried out by government-approved agencies and experts. The second concept involves the application of the just-in-time (JIT) management concept for managing WEEE. The concept ensures that WEEE is only requested from the recycler or the individuals in possession of it and only on demand. The study adopted a qualitative research approach. Data collection and analysis were achieved via semi-structured phone interviews and thematic analysis, respectively. The outcome of the study limits the activities of the informal recyclers to WEEE collection. Informal recyclers gain revenue from collection. A reduction in the waiting time of workers and WEEE storage space is achieved. This offers safety, efficiency, and an increased productivity. This will help to revolutionise the WEEE management system in the location.

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Section: Discussionmentioning

confidence: 99%

Section: Just-in-time Conceptmentioning

confidence: 99%

Enhancement of WEEE Management Practices in MTN Phone Village, Rumukurushi, Port Harcourt, Nigeria

et al. 2021

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A hybrid intelligent busbar protection strategy using hyperbolic S‐transforms and extreme learning machines

Rahimnejad

Gil

Abdoos

et al. 2021

Engineering Reports

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In power systems, busbars connect important components such as generators, transmission lines, and loads. A typical fault occurrence on the busbar may result in the isolation of faulty sections from other normally operating parts of the system resulting from differential protection operation. Although the main busbars' protection scheme is differential protection, its operation is significantly affected by magnetic saturation of the current transformer (CT), particularly during external fault occurrence or energizing power transformers. Saturation of the CT may generate a spurious differential current and is the main reason for the differential scheme malfunctioning. Previous research presented different methods to modify and improve busbars' differential protection scheme. However, there has been lack of a comprehensive study to assess the efficiency of the busbar protection scheme regarding all involved, and influencing aspects including various fault types, energizing power transformer, (high) fault resistance, fault angle (changing from 0 • to 360 • ), and the angle of the sources. Thus, in this study, a hybrid intelligent busbar protection scheme is proposed and the effects of all these factors are investigated. The proposed strategy utilizes the hyperbolic S-transform as a signal processing technique to extract an efficient feature that is able to discriminate internal faults from other abnormal modes, that is, external faults and inrush current under CT saturation. To obtain this goal, a learning-based classification method known as extreme learning machines is used to classify the system conditions based on the selected features. The proposed protection scheme was found to have low sensitivity to CT saturation and noise and was able to accurately detect internal faults from half a cycle to one cycle of the power system depending on the fault resistance.

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New principle of busbar protection based on a fundamental frequency polarity comparison

Cited by 2 publications

References 11 publications

Enhancement of WEEE Management Practices in MTN Phone Village, Rumukurushi, Port Harcourt, Nigeria

Enhancement of WEEE Management Practices in MTN Phone Village, Rumukurushi, Port Harcourt, Nigeria

A hybrid intelligent busbar protection strategy using hyperbolic S‐transforms and extreme learning machines

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