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 38 for “"Circuit Breaker"”.
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Investigating DC circuit breaker service life
… methods to extend the service life of DC circuit breakers using inductive voltage spike mitigation techniques aimed at reducing electric arcs during switching operations. Unlike AC systems, DC lacks a natural zero-crossing which results in large transient voltages that accelerate switch …
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Analysis in circuit breaker performance requirements for high-voltage DC networks
… system is unable to transfer power. Prototype dc circuit breakers have been developed by manufacturers to, in theory, allow seamless operation of the healthy areas of the network when a fault occurs. In order to do this they operate extremely fast; opening in less than 5ms. To achieve this the …
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Graphical analysis of recovery voltage across a resistance-shunted circuit breaker
Thesis: B.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1959
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A retrot current sensor for non-intrusive power monitoring at the circuit breaker
… power monitoring that measures current flow in a circuit breaker without permanent modification of the breaker panel or the circuit breaker itself. At the breaker panel, an inductive pickup and low-power amplifier sense current from the breaker face. Two coupled resonators form an inductive link …
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Improving fault location through interpole analysis of circuit breaker and automatic reclose scheme operation
… and from the impact of variable remote end short circuit level. A novel concept of a single ended impedance based fault location method using analysis of 'interpole' states, which arise during the operation of the circuit breaker as the individual poles open sequentially, has been developed. The …
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Hybrid Modular Multilevel Converter Family and Modular DC Circuit Breaker for Medium-voltage DC (MVDC) Applications
… strategies and equipment, particularly DC circuit breakers (DCCB), poses a significant challenge to the development of MVDC systems. Therefore, this thesis aims to address two primary challenges in the field: the improved topologies of MV AC/DC conversion techniques for interfacing MVDC …
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Design, Simulation, and Hardware Construction of a 600 W Solid State DC Circuit Breaker for the DC House Project
<p>DC circuit breakers must be able to arrest overcurrent conditions to prevent electrical equipment and wiring from causing building fires or other hazards from occurring. With more DC renewable sourced structures such as Cal Poly’s DC House, an inexpensive and reliable protection system is …
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CLASSIFICATION OF HIGH IMPEDANCE FAULTS, INCIPIENT FAULTS AND CIRCUIT BREAKER RESTRIKES DURING CAPACITOR BANK DE-ENERGIZATION IN RADIAL DISTRIBUTION FEEDERS
… partial breakdown to a cable insulation, and a circuit breaker (CB) malfunction due to capacitor bank de-energization to cause current restrikes. These abnormal events are not detectable by conventional protection schemes. In this dissertation, a new technique to identify distribution feeder …
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Electrical, Magnetic, Thermal Modeling and Analysis of a 5000A Solid-State Switch Module and Its Application as a DC Circuit Breaker
… and demonstration of a novel solid-state DC circuit breaker. The mechanical circuit breaker is widely used in power systems to protect industrial equipment during fault or abnormal conditions. Compared with the slow and high-maintenance mechanical circuit breaker, the solid-state circuit …
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DC thyristor circuit breakers: An investigation of current interruption ability
… of the project were to investigate DC Thyristor Circuit Breaker (TCB) current interruption and appraise the current interruption performance in simulated systems. A generalized analysis was developed which enabled succinct assessment of the current interruption performance of different thyristor …
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An analog and digital data acquisition system for Non-Intrusive Load Monitoring
… current sensor for deployment in a standard circuit breaker box. The current sensor uses discrete JFET devices to passively transmit data inductively through the steel door of the circuit breaker.
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Z-source circuit breakers in naval power systems
… on future vessels. Integrating the z-source circuit breaker into a "typical" naval MVDC power system requires understanding system dynamics that may cause the circuit breaker to inadvertently energize a circuit through regenerative turn-on of the thyristor. An electrically-scaled model and a …
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Modeling of AC circuit breakers in the electromagnetic transients program
… was to develop and implement a model for an A.C circuit breaker in the Electromagnetic Transients Program (EMTP). Various models for the arcing process were evaluated, and the modified Mayr equation was chosen for the model. Other equations were added to demonstrate the generality of the …
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Direct current hybrid vacuum breaker
Hybrid DC circuit breaker switching techniques have been proposed for use in multi-terminal HVDC networks, to create an efficient, reliable and controllable system. There are two DC hybrid switching techniques. The first is arc interruption based on current oscillation. The second is interruption …
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FUZZY EXPERT SYSTEM FOR FAULT DIAGNOSIS OF POWER SYSTEMS
… for identifying fault sections by using tripped circuit breaker and operated relay signals as input (chapter 2). The approach uses fuzzy logic set theory to deal with the uncertainties that occur during operation involving the fault location. A fuzzy expert system that used this approach is built …
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Supercapacitor-assisted Arc Management (SCA2M) technique for DC circuit breakers in low-voltage applications
Direct Current (DC) circuits are gaining popularity due to their compatibility with renewable energy. However, their development is hindered by the lack of mature DC protection, such as circuit breakers. Unlike alternating current (AC), DC lacks natural zero-crossing points, making arc extinction …
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Análise de zeros atrasados em unidades offshore
… appear in electrical systems, whenever a short circuit occurs somewhere nearby electric generators buses. In the case of offshore production platforms, the so called asymmetry, along with other specific conditions, may give rise to the so called “delayed current zeros” phenomenon in the short …
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Home NILM : a comprehensive energy monitoring toolkit
… unavailable locations such as the front of the circuit breaker or the surface of a multi wire cable. This sensor is based off a Tunneling Magnetoresistive (TMR) element which is wrapped in a novel feedback architecture to provide a linear measurement of magnetic field strength over several …
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Abb Inc. medium-voltage products' supply chain analysis, including inventory, supplier scorecard, and risk assessments
… (magnetic-actuated) medium-voltage circuit breakers. With the goal of improving the efficiency of the ADVAC/AMVAC supply chain, the study involved analyzing circuit breaker inventory level and position, assessing a supplier scorecard, and assessing general supply chain risk …
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Simulation of power station protection equipment
… in the system, and also to include the effect of circuit breaker opening, arcing resistance, and earthing resistance. A fictitious field winding was included to enable more accurate prediction of fault currents when the system is operating at both lagging and leading power factors prior to the …
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