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 11 of 11 for “"Transformer saturation"”.
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A microprocessor based bus relay
… new technique to overcome the problem of current transformer saturation. The protection scheme uses a combination of the percentage differential current principle and the phase comparison principle. A sampling rate of 1440 Hz is used. Existing algorithms for a saturation detector are reviewed and …
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Simulation of power station protection equipment
… effect is included. Modelling of a current transformer is included because transformer saturation may occur if the fault current is high, and hence the secondary current is distorted. Experiments were carried out to confirm that distorted currents will affect the relay operating time, and it …
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A New Digital Relay for Dispersed Storage and generation (DSG) Units
… harmonics that can fail surge arrestors or cause transformer saturation. The new relay will be able to detect this condition at the inter-tie and trip the cogeneration facility. In order to make this multifunction relay cost effective, it includes protection functions for traditional relay …
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Modeling and Control of a Single-Phase, 10 kW Fuel Cell Inverter
… loop, with careful consideration to avoid transformer saturation, is employed for the phase-shifted DC-DC converter. Several experimental transfer functions were measured to confirm the modeling assumptions and verify the control design of the DC-DC converter. Two control options for the …
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Impact of MHD-E3 on power system equipment and loads.
… of 1000 amps within the power grid, will cause transformer saturation that leads to abnormal power absorption and high levels of harmonics in the power system. Research herein explores the impact of these direct currents on transformers, the impact of elevated levels of harmonics on power system …
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High-Resolution Time-Synchronized Monitoring and Anomaly Detection in Modern Distribution System
… half. In Chapter 4, an SVM-based detector for transformer saturation caused by geomagnetically induced currents (GICs) is developed using synchronized harmonic real power derived from the harmonic synchrophasors estimated by the algorithm in Chapter 2. This approach offers a more cost-efficient …
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Data-driven Protection of Transformers, Phase Angle Regulators, and Transmission Lines in Interconnected Power Systems
… awareness and data availability.</p><p>Power transformers, Phase Shift Transformers or Phase Angle Regulators, and transmission lines are critical components in power systems, and ensuring their safety is a primary issue. Differential relays are commonly employed to protect transformers, …
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An improved bus protection technique with dissimilar current transformers
… relay includes a new technique to detect current transformer saturation. This saturation detector is the Masters thesis work of Dr. Lifeng Yang, an alumnus of Virginia Tech. A newly developed type of measuring device called a Magneto Optic Current Transducer (MOCT) has been installed on both ends …
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Current transformers transient response modelling using electromagnetic transient program (EMTP)
The subject of this thesis is Current Transformer Transient response study using an electromagnetic Transient program (EMTP). Current transformers are considered eyes for power system protection. Behaviours of protection systems depend largely on information fed to them by instrument transformers. …
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Development of a finite element matrix (fem)three-phase three-limb transformer model for Geomagnetically Induced Currents (GIC) experiments
… material damage to system components like power transformers. In power transformers, GIC impacts are evidenced by part-wave saturation, resulting in transformers experiencing increased presence of odd and even harmonics. The three-phase three-limb (3p3L) transformer has been found to be the most …
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Power distribution feeder response to the asymmetric saturation of substation transformers caused by significant high-side DC currents.
… geomagnetic disturbances can lead to asymmetric saturation of utility transformer cores by causing significant DC current to flow through the transformer windings. Transformer secondary voltage and current waveforms are distorted by core saturation and this distortion can be amplified at points …