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 14 of 14 for “"Ground fault"”.
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ADAPTIVE GROUND FAULT PROTECTION FOR A DISTRBUTION NETWORK
… thesis includes the investigations for setting ground overcurrent relays in a distribution system and changing the settings to adapt to the operating conditions of the system. Four software modules were developed for this purpose and were tested using a personal computer. The results reported in …
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Development and Prototyping of a Ground Fault Circuit Interrupter for 3-Phase 480 Volt Systems
<p>Ground Fault Circuit Interrupter (GFCI) technology was first introduced in the NEC in 1971, yet four decades later the technology has not been introduced to a great extent outside of the home environment. This thesis introduces the difficulties encountered in low-voltage three phase ground fault …
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Improvement of Ground-Fault Relaying Selectivity through the Application of Directional Relays to High-Voltage Longwall Mining Systems
… systems. Simulations show that during a line-to-ground fault, the larger system capacitance can cause a situation where the ground current sensed by the ground-fault relays in unfaulted circuits is greater than the mandated ground-fault relay pick-up setting. Simulations show that ground-fault …
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Cogeneration in distribution system : planning, operation, transients
… of the induction generator, by single line-to-ground fault, double line-to-ground fault through contact resistances, broken conductor touching the ground through a small resistance, isolating the induction generator to form its own supply domain (islanding) etc are investigated and interesting …
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Fault location on EHV lines using wideband spread spectrum techniques
Electrical authorities require fast and accurate fault locators to protect tha quality of supply and reduce outage times. Spread spectrum techniques perform well in high noise environments such as power lines and their use in radar ranging is well known. Existing power line carrier (PLC) equipment …
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A study of some unbalanced fault conditions of power systems
… solutions to the problem of power systems fault and stability studies. However, with a few notable exceptions, previous efforts have largely been confined to attempts to solve the problems in the classical manner by having the computer simply take over the tedious portion of the …
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Modeling of doubly-fed induction generators connected to distribution system based on eMEGASim® real-time digital simulator
… simulator, some studies such as three-phase to ground fault and voltage sag have been made to test the response of the model.
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A study of the effects of full three-phase representation in power system analysis
… transient overvoltages caused by single line-to-ground fault clearing and, therefore, may be represented fully transposed. It is noted, on the other hand, that unbalanced loads can affect the transients and must be included in the analysis. It has been shown, however, that balanced initial …
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Relay coordination with multiple breaker-in/breaker-out stations on the transmission line
… purpose of power system protection is to remove faults from the system as soon as possible so minimum damage happens to the transmission line or other equipment connected to the line. Tennessee Valley Authority (TVA) planners want to add multiple breaker-in/breaker-out stations on a two terminal …
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Vehicle to grid (V2G) for reliable microgrid operation: Voltage/frequency regulation and real-time OPAL-RT digital simulation
… an emergency situation that happens by a fault or blackout so the system will be disconnected from the grid, in a concept that a home (or residence) is equipped with a PV (Photovoltaic) system and Electric Vehicle (EV) with V2G/V2H (Vehicle to Grid or Vehicle to Home) capability. A Phase …
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ANALYSIS OF COMPOSITE A-C AND D-C SYSTEMS
… has been extended to the analysis of . a faulted power system including the effect of system dissymmetry produced by unbalanced capacitor short circuits. The performance aspects of d-c transmission links have also been examined and the mathematical models of unbalanced convertor operation …
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Data-driven Protection of Transformers, Phase Angle Regulators, and Transmission Lines in Interconnected Power Systems
… and adoption of machine learning approaches for fault detection in modern electric power grids. Once a fault has occurred, it must be identified quickly and a variety of preventative steps must be taken to remove or insulate it. As a result, detecting, locating, and classifying faults early and …
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Application of Sweep Frequency Response Analysis and Locked-Rotor Test for Stator Winding Inter-Turn and Broken Rotor Bar Fault Detection of Squirrel-Cage Induction Motors
… processes' reliability [7]. Stator winding faults include inter-turn fault, phase to phase fault, coil to coil fault, and phase to ground fault. The stator winding insulation usually begins with inter-turn faults comprising of a small number of winding turns which makes it more probable than …
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Using Intrinsic 3rd Harmonics for Large Synchronous Generator Insulation Fault Condition Monitoring
… for detecting generator stator insulation faults using intrinsic third harmonics. Based on two-port network theory, a mathematical model is derived and presented in this thesis. Data from offline experiments has been analyzed to verify the technique’s effectiveness. Additionally, online …