Browsing by Author "Ariunbolor Purvee"

Now showing 1 - 13 of 13
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    Analysis of harmonic behavior in power grids with induction melting furnaces
    (2023) Ariunbolor Purvee; Ankhbayar Vandandorj
    This research paper investigates the impact of an 800 kW induction furnace on power quality within a connected power grid. The performance and lifespan of induction furnaces can be negatively affected by harmonic voltages and currents. The degree of harmonic distortion in an induction furnace is influenced by the melting load, and excessive distortion can result in the generation of higher frequencies in the power distribution system. This phenomenon poses significant challenges to power systems, including power quality issues and equipment failures. Therefore, it is crucial to closely monitor and control the level of harmonic distortion to ensure optimal system performance and longevity. In this study, power quality and its parameters are assessed following the Mongolian MNS 1778:2007 standard, which outlines twelve parameters for evaluating single-phase or three-phase 50 Hz AC power systems. However, particular emphasis is placed on the analysis of total harmonic distribution (THD) as a key parameter impacting power quality. Our analysis demonstrates that substantial distortion in the furnace current waveform can lead to THD voltages in 6/10 kV transmission lines and substations, resulting in energy efficiency losses.
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    Centrifugal slurry pump vibration analyze
    (German Mongolian Institute for Resouce and Technology, 2019-05-07) Zolboo Batsaikhan; Gureragchaa; Ariunbolor Purvee; Odbileg Norovrenchin
    This bachelor work is a part of the “Slaked lime system” problem developing project and it is aimed to discover and modify a slurry pump overheat problem occurred at Oyu Tolgoi mine. And it is searched for ways to reduce overheating so that the mining operation could have benefit in numerous ways.
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    Design and implementation of a data acquisition system for multi fault diagnosis analysis in induction motors
    (German Mongolian Institute for Resouce and Technology, 2024-05-20) Tuvshin Gankhuyag; Ariunbolor Purvee; Turbat Shagdar
    This Master's thesis focuses on the design of a data acquisition system for detecting motor faults early and implementing smart maintenance strategies. Understanding and diagnosing faults in induction motors is critical for maintaining the reliability and efficiency of industrial operations. The thesis aims to design a data acquisition system for early detection of motor faults. By developing a novel data acquisition system and comparing its performance with existing systems, this research aims to provide valuable insights and practical solutions to enhance motor fault diagnosis, ultimately improving operational reliability and reducing downtime in industrial settings. The study begins by introducing the main research topic, discussing its broader context and significance, and emphasizing the need for a reliable data acquisition system for multi-fault diagnosis in induction motors, particularly squirrel cage motors widely used across various industries.
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    Designing an off-grid, battery-backed solar PV system for a gable roof cottage in Mongolia
    (German Mongolian Institute for Resouce and Technology, 2023-05-18) Dashnamjil Tuvshintur; Ariunbolor Purvee; Nyamdulam Renten
    Global energy consumption is anticipated to increase by approximately 50% between 2018 and 2050, with the trend echoed in Mongolia, where annual electricity and heating demands are forecasted to grow at rates of 4.4% and 3.4% respectively up to 2030. This is prompting a transition towards renewable energy sources. The research focused on examining the feasibility of using off-grid photovoltaic (PV) solar systems for gable-roofed houses in Mongolia.
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    Determining Underground Network High Harmonic Conditions and Assessing Impact on the Grounding System or Grounding Protections.
    (German Mongolian Institute for Resouce and Technology, 2024-05-10) Sugarragchaa Tsevlee; Vandandorj Ankhbayr; Ariunbolor Purvee; Dorjsuren Yandagsuren
    This thesis investigates the high harmonic conditions in the underground electrical network of the Oyu-Tolgoi mine, analyzing their effects on the grounding system and protection devices. The research focuses on the 47th harmonic, notably dominant due to the mine's extensive use of DC-powered production hoists and rectifier systems. By collecting and analyzing harmonic data from substations 1118-SWG-2001 and 1855-SWG-2001, statistical analyses revealed a strong negative correlation between Total Harmonic Distortion (THD) and load current. Higher load currents reduced THD, but the persistent presence of high-order harmonics posed a significant risk to grounding protection. The 47th harmonic, in particular, exceeded both MNS and IEC standards, suggesting a potential for resonance and nuisance tripping in grounding protection systems. The thesis identifies the need for targeted harmonic filtering, updated protection relays, and continuous monitoring to mitigate these issues. Recommendations include installing advanced harmonic filters, implementing regular system audits, upgrading protective relays, and conducting real-time system monitoring. These solutions will help ensure the reliability and safety of the Oyu-Tolgoi mine's electrical infrastructure while providing actionable strategies for maintaining uninterrupted operations and adequate grounding protection.
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    Evaluating the condition of the substation’s grounding grid with its relation to corrosion
    (German Mongolian Institute for Resouce and Technology, 2024-05-10) Enkhbileg Ganzorig; Ariunbolor Purvee; Dorjsuren Yandagsuren
    This thesis evaluates the condition of the grounding systems in the substations of the Erdenet Mining Corporation. The research involved assessing soil resistivity, measuring grounding grid corrosion, and determining grounding resistance across 13 substations operating at various voltage levels. The analysis revealed critical insights into the grounding equipment's state, the corrosion rates, and the environmental factors affecting the system. Most substations exhibited grounding resistance values within the permissible limits defined by international and Mongolian standards. However, certain substations, like TSRP-2 and TSRP-3, exhibited significant mechanical damage due to corrosion, necessitating immediate intervention. Ampacity calculations demonstrated diverse requirements for conductor sizing, ranging from 3.5 kA to 14 kA, with the TSRP-1 substation showing the highest short-circuit current ampacity. The findings from this study offer valuable recommendations for ensuring safety, enhancing grounding system reliability, and improving corrosion protection measures at the Erdenet Mining Corporation's substations. The results underscore the importance of periodic inspections and targeted interventions to maintain optimal grounding conditions.
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    Life Time Evaluation of Laser-Coated Pump Parts in the Mineral Processing Industry
    (German Mongolian Institute for Resouce and Technology, 2019-09-08) Dulguun Narmandakh; Ariunbolor Purvee; Battulga Nasanjargal
    This thesis aims to choose the best laser coating powder system among experimented materials and to estimate the useful life of specific laser coated pump parts. Slurry pumps in mineral processing are parts which erode away very quickly. Erosion is dominantly caused by abrasion from fine particles of the ore. Due to its cause, the process of erosion takes place on impeller blades and cover plates which have direct contact with the slurry. Erdenet Mining Corporation has cooperated with GMIT and Prof. Dr. Gunther Stehr for this thesis work as a project. The Corporation supplied self-produced impeller and cover plate of the slurry pump (GrAT–1400/40). This type of pump is designed in Russia. It used for delivering Copper and Molybdenum ore in Concentration Plant at Erdenet Mining Corporation. The GRAT – 1400/40 pump parts were delivered to Germany for laser coating and shipped back for trial. At Concentration Plant of Erdenet Mining Company, we used three different thermal coatings to have early research point to gain the most suitable solution as trial. Technical estimations have been done. Without changing design or base material (economically suitable material for the area), gaining higher lifetime is very important. Achieving favorable result would greatly benefit industries which specifically uses pump for delivering slurry.
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    Optimization for Operational Regime of Water Pump System at Processing Plant
    (German Mongolian Institute for Resouce and Technology, 2021-05-21) Lkhagvasuren Gurbazar; Ariunbolor Purvee; Odbileg Norovrenchin
    Water distribution systems have a significant energic impact on mineral processing due to the large amount of energy consumed in water pumping. Thus, the economical and efficient operation of the water pumping system is a crucial concern in mining companies. With the careful operation of the pump may lead to considerable energy savings and minimize mechanical wear. Therefore, the present research is aimed to optimize the pump operation policy of the circulating water pumping station at Erdenet Mining Corporation (EMC). The circulating water pumping station is a vital facility at the EMC that is responsible for supplying about 84% of the processing water to the mineral processing plant. This facility consists of 5 main pumps which have high electric consumption. In addition, at EMC, three types of electricity tariffs are employed: daytime consumption, evening consumption, and night consumption. Each tariff zones have different prices for electricity utilization. So that, this study is intended to determine the optimal operational regimes for the pump system based on different tariff prices and other constraints. In this research, the combination of pump scheduling and tank level approaches are introduced to improve the efficiency of a water supply system. Two MATLAB codes are developed to define the optimal pump operation policy. The obtained results show that optimization of pump operation can minimize energy cost up to 30% compared to the actual operation. Although this value is only found based on theory, in practice, this value can severely decrease.
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    Possibility of Alteration of the ore mechanical property for improvement of the transfer chute design problems
    (German Mongolian Institute for Resouce and Technology, 2018-08-15) Tengisdulguun Tumenjargal; Ariunbolor Purvee; Ariunbold Puntsag
    The mining industry has been expanding rapidly in Mongolia for last 2 decades. As a result, many problems are arising which require solutions from Mongolian engineers. Effectiveness and productivity of copper mining industry depend on appropriate actions and processes of various types of devices, techniques and machineries, which are used at mining sites. One of these important devices is a transfer chute.
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    Real-time volumetric measurement of grinding media of SAG mill
    (German Mongolian Institute for Resouce and Technology, 2020-06-08) Nauryzbyek Byekyetkhan; Munkhbaatar Purevdash; Ariunbolor Purvee; Sungchil Lee
    This research work aimed to investigate the “Real-time volumetric measurement of grinding media of semi-autogenous (SAG) mill” by using an online-based model. Oyu Tolgoi (OT) mine copper concentrator is located in South Gobi province, south part of Mongolia. SAG mills are often taken as the object of optimization studies because they are a type of equipment that consumes large amounts of energy. Its size reduction stage includes one primary crusher which feeds two SAG mills (11.58m diameter x 7m length) with the following three ball mills (7.32m diameter x 11.32m length). After sag mill, comminuted products pass through a trommel screen in which over and undersize materials its oversize part is circulated into SAG mill and undersize part is conveyed to hydro-cyclone to further process.
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    Reducing of vibration influence on auger drilling rig (SBR-160A-24)
    (German Mongolian Institute for Resouce and Technology, 2019-05-01) Batsuuri Dalainyam; Ariunbolor Purvee; Baljinnyam Erdenetsoo
    The main objective of this work is to analyze the vibration, to find the sources and to examine for optimal solutions in SBR-160A-24 auger drilling rig. Design and modelling are based on result of this research work. Auger drilling rigs used in ‘Baganuur LC’ coal mine. The company spends half of its expenses of operations costs on auger drill bits. There are a number of reasons such as rotational speed of drill is a constant for drilling different hardness material in layers. Currently, they do not have any monitoring and automatic control system to manage the current of motor and the rotational speed. The machine can work under high vibration itself and a monitoring system with smart sensors are not suitable for under high vibrations. The experimental result was proved the auger drill rigs had a high vibration. Thus, it leads to the bachelor thesis is researched vibration causes and their influence. From the measurement results, the vibration reducing solution founded and there some calculation and analysis of modelling done as needed.
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    Study on Water hammer in Lime Slurry Pipeline
    (German Mongolian Institute for Resouce and Technology, 2019-05-07) Turtsetseg Nanjid; Odbileg Norovrenchin; Ariunbolor Purvee
    The present study is intended to examine the effect of water hammer in milk of lime distribution system at Oyu Tolgoi LLC. The company produces copper concentrate and the flotation process for the copper concentrate production requires slaked lime in order to control pH value. It is essential to prevent system failures because of safety and economic purpose.
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    Vibration Analysis for Fault Detection of Automobile Engine
    (German Mongolian Institute for Resouce and Technology, 2021-05-28) Yelaman Byambayev; Ariunbolor Purvee; Odbileg Norovrinchen
    This bachelor work reviews the analysis and diagnosis of automobile engines with the use of vibration. In recent years, it has been proven that vibration analysis is not only applicable for the fault detection of bearings and gears but also automobile engines. The aim of this research work is to monitor, diagnose and detect faults in an automobile engine by conducting vibration analysis. A professional car diagnostic tool was used in order to lower the costs of operation. Moreover, vibration analysis was conducted to decrease the risk of catastrophic damage on automobile engines. Analysis was based on the measurement of the vibration data acquisition device. Spectrum analysis and Fourier Transform techniques were used to observe patterns in data. The research outcome is about automobile engine health and faults.