Browsing by Author "Yadav, Ram Pukar"

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    ANALYSIS OF THE IMPACT OF EV PENETRATION ON PROTECTION COORDINATION
    (I.O.E. Pulchowk Campus, 2023-04) Yadav, Prem Kumar; Yadav, Ram Pukar; Sah, Sachidanand; Jha, Sashish
    The global electric vehicle (EV) market has witnessed significant growth in recent years, driven by concerns over climate change, advances in battery technology, and supportive government policies. To address environmental pollution and the increasing energy consumption associated with conventional transportation systems, the adoption of EVs has emerged as a more sustainable alternative. However, the rapid increase in EV charging loads has raised significant operational challenges for power grids. This research project focuses on the impact of EV integration on relay and protection coordination in distribution systems. Relay and protection coordination plays a crucial role in ensuring the safe and reliable operation of distribution systems by detecting abnormal conditions, such as faults or abnormal load conditions, and isolating the affected section to prevent further damage or outages. With the proliferation of EVs, the increased charging load introduces harmonic currents that can disrupt the operational parameters of the power grid. This study utilizes the IEEE standard 33 bus distribution system as a testbed to evaluate protection coordination using genetic optimization techniques. By adding EV chargers at various nodes of the distribution system, the project assesses the time required for circuit breakers to trip in the event of a fault, evaluating the effectiveness of protection coordination techniques in the presence of EVs. The findings reveal that while the replacement of standard loads with EV chargers leads to a slight increase in the net RMS value of current and introduces harmonic currents, the sequence of relay operation remains unaltered. However, the relay operation time is affected, and in scenarios with bulk penetration of EV chargers, the increased harmonic current can cause overloading and other faults, resulting in relay trips. To ensure the proper protection of the system, it is recommended to increase the pickup current for the relays. By adjusting the pickup current level, the relays will trip at higher current levels, mitigating false tripping caused by harmonic currents from EV chargers. The study emphasizes that meticulous design and planning are essential to maintain the reliability and protection of power distribution systems when integrating EV chargers.
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    'Case in English and Maithili Language: A Contrastive Study'
    (Department of English, 2009) Yadav, Ram Pukar
    he title of the present dissertation is 'Case in English and Maithili Language: A Contrastive Study' which shows the similarity and differences between the case system of both thelanguagesto find case and difficulty between both the languages. Naturally, common things emphasize on the case and dissimilar things assert on the difficulty. Itaims atfindingsimilar or equivalent cases of English and Maithili language on semantic level. However, the case marking system is different in both of the languages. The present thesis is divided into six chapters. The first chapter deals with major area which determines the whole dissertation. The second chapter analyzes case in English language in an elaborate way and third chapter concentrates on the Maithili case and the forth one includes similarities and differences prevalent in case marking system of these two languages. And the fifth chapter suggests pedagogical implication of the study and the six chapter encompasses the conclusion of the thesis.