Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"thermal limits"”.
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Optimal Mitigation of Geomagnetically Induced Current Effects in Power Systems Considering Transformer Thermal Limits
… metallic hotspot temperatures, checking if the limits are reached, and optimally placing BDs on selective transformers such that the hotspot temperature of transformers is within maximum limits, and the system voltage is recovered above minimum permissible voltage. The optimization is done using …
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Complex Flow-Based Non-Linear ATC Screening
The prediction of the transfer size to reach the thermal limits is done using a fast method that incorporates the effect of reactive power flows in linear ATC. The estimation of bus voltage constraints is based on a system state approximation using an explicit polynomial expression on the transfer …
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Wettability of candidate Accident Tolerant Fuel (ATF) cladding materials in LWR conditions
… strength and structural integrity under thermal shocks. However, knowledge is relatively deficient for the thermal-hydraulic properties of these materials, particularly under light water reactor (LWR) operating conditions. The surface wettability is particularly important, as it affects …
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Fluoride-salt-cooled high-temperature test reactor thermal-hydraulic licensing and uncertainty propagation analysis
… to incorporate uncertainty propagation in a thermal-hydraulic safety analysis for test reactor licensing. A hot channel model, Monte Carlo statistical sampling uncertainty propagation, and limiting safety systems settings (LSSS) approach are uniquely combined to ensure sufficient margin to …
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Effects of water temperature on life history traits of selected South African Aquatic insects: implications for the ecological reserve
… a growing awareness of the need to incorporate thermal guidelines into legislation regarding environmental flows and associated water management plans. In South Africa radical new legislation introduced in 1996 resulted in rivers and aquatic ecosystems being given a right to water of their own- …
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Line-limit-preserving power system equivalents
… to create power system equivalents that preserve thermal line limits. Existing equivalent methods do not retain thermal limits of equivalent lines, which may result in the transfer capability of the equivalent case differing significantly from that of the original case. Hence, power system …
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Thermal Overload Capabilities of an Electric Motor and Inverter Unit Through Modeling Validated by Testing
… air compressors. As one part of the development, thermal considerations and the cooling system are detailed in this paper. The motor and inverter are packaged in one unit with the heat sink in the middle. The heat sink is a cold chamber designed to absorb the maximum heat losses from the unit. …
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The application and assessment of active network management techniques for distribution network power flows
… such that distribution networks operate within thermal limits. Studies are conducted in a closed-loop simulation environment, with actual hardware, on two topologically different networks to demonstrate the flexibility of the novel application of the Optimal Power Flow (OPF) and the Constraint …
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Ecophysiology of Hibernating Eastern Red Bats (Lasiurus Borealis)
… yield a better understand of this species’ thermal limits and have predictive value when estimating winter energy budgets.
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Modeling, Manufacturing, and Experimental Validation of an Electric Machine for Aircraft Propulsion
… 1-MW prototype is expected to remain within the thermal limits imposed by the winding insulation.
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Three-Dimensional Loss Effects of a Solenoidal Inductor with Distributed Gaps
… selecting a design that meets the efficiency and thermal limits. Second, a detailed explanation is provided on the 3D loss effects, along with the recommended design considerations and a method to estimate the dominant 3D loss effect using simple 2D simulations. The design recommendations address …
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Electric-thermal modelling of power electronics components
Electro-thermal modelling of power electronics system is considered to be one of the most important design techniques for the development of compact and high-power density power electronics systems for the future. For handling inevitable heat generation due to non-ideal nature of components both …
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Magnetic levitation for down-hole submersible pumps
… increase is possible without exceeding the thermal limits of the motor. Results show that designing and building magnetic levitation motors for down-hole applications, under the size constraints of current submersible pumps, is feasible. Furthermore, maintaining the levitation gap under …
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Robust Electric Power Infrastructures. Response and Recovery during Catastrophic Failures
… of the technique. Constraints in PSR as thermal limits of transmission lines (TL), stability issues, number of TL used in the restoration plan and lockout breakers were used to create feasible PSR plans. To compare the time necessary to achieve the PSR plan with another technique a PSR …
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Distributed Electric Aircraft Propulsion Architectures with Fault Protection Strategy
… fault in the system causes an abnormal amount of thermal energy inside the cable. The thermal energy accrued within the cable due to the fault leads to an increase in temperature beyond the thermal limits and breaks down the insulation. The thermal stress on a conductor is indicated by the current …
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Hosting Capacity Optimization in Modern Distribution Grids
… placement of DG while enforcing operating limits (e.g. voltage limits and line thermal limits). Traditionally, power flow is simulated by solving full nonlinear AC power flow equations for each potential configuration. Existing methods for computing hosting capacity require extensive …
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The thermal macrophysiology of core and marginal populations of the aphid Myzus persicae in Europe
… to higher or lower temperatures. Lower thermal limits were more plastic than upper limits, enabling tolerance ranges to be increased following acclimation at 10°C, but reduced on acclimation at 25°C. Rates of change varied between clones, suggesting that certain clones could be more …
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The thermal tolerances and preferences of native fishes in the Cape Floristic Region: towards understanding the effect of climate change on native fish species
… behaviour, and life-histories of aquatic biota. Thermal alteration may therefore affect sensitive fish species. The upper thermal limit, determined via the critical thermal method, has been validated as a measure of thermal sensitivity. To better understand the impacts of climate change on the …
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Nuclear Electric Propulsion with Low Enriched Uranium
… analysis of many possible core designs. Core thermal limits are assessed using a finite element method within a thermal hydraulics solver. Models are constructed for estimating the mass of the power conversion system components: turbomachinery, alternator, recuperator and waste heat radiator. …
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Simulation of Isothermal Combustion in Gas Turbines
… combustion temperature of the fuel. In addition, thermal limits of turbine blade materials also places an upper bound on turbine inlet temperatures. Thus, the current strategy for improving gas turbine efficiency is inherently limited. Introduction of a new gas turbine, based on an alternative …
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