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Lukas Graber

Georgia Institute of Technology · US
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Area of research
Electrical and Electronic Engineering · Materials Chemistry
Research interest
Research topics from publications: High-temperature superconducting (HTS) power cables cooled by helium gas; Control Development and Fault Current Commutation Test for the EDISON Hybrid Circuit Breaker; Development of CORC ® cables for helium gas cooled power transmission and fault current limiting applications; AC Flashover Voltages Along Epoxy Surfaces in Gaseous Helium Compared to Liquid Nitrogen and Transformer Oil; The dielectric properties of gaseous cryogen mixtures of He, H2, Ne, and N2 in a temperature range of 50–80 K at pressures up to 2.0 MPa; Use of partial discharge inception voltage measurements to design a gaseous helium cooled high temperature superconducting power cable; Evaluation Tests of Metal Oxide Varistors for DC Circuit Breakers; Piezoelectrically Actuated Fast Mechanical Switch for MVDC Protection; Dielectric Properties of Cryogenic Gas Mixtures Containing Helium, Neon, and Hydrogen; Cryogenic Thermal Studies on Terminations for Helium Gas Cooled Superconducting Cables. Representative work: The dc circuit breaker is an indispensable building block for dc network systems. Hybrid circuit breakers that combine mechanical and solid-state switches have more potential to be utilized in dc distribution networks because of their lower conduction losses and fast interrupt speed. The efficient energy dc interrupter with surge protection (EDISON) removes any solid-state circuit in the main current path, thereby substantially reducing the conduction losses during normal operations. However, it requires a dedicated control with fast dynamics because any false triggering of the mechanical switch or solid-state switches of the breaker would lead to a commutation failure and a potential unquen Abstract High-temperature superconducting (HTS) direct current (dc) power cables allow high levels of power transmission and distribution at low loss and can be tailored to effectively limit fault currents. HTS Conductor on Round Core (CORC ® ) power transmission cables offer additional benefits over other HTS cable designs, including a much higher current density and a higher degree of flexibility. These benefits make CORC ® cables most suitable for applications in confined spaces where tight bends are required, such as onboard naval ships and in data centers. The development of CORC ® power transmission cables for operation in pressurized helium gas is desc
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Recent publications

A Nonlinear Inductor-Based Near-Zero Current Sensing Method and Active Commutation Strategy for a Hybrid dc Circuit Breaker
2025cited by 1position: lastdoi
Analysis, Modeling, and Experiments of a Nonlinear Inductor-Based Fault Current Commutation Strategy for a Hybrid DC Circuit Breaker
IEEE Transactions on Transportation Electrification 2024cited by 5position: middledoi
Modeling and Experiments of a Nonlinear Inductor-Based Fault Current Commutation Strategy for a Hybrid Dc Circuit Breaker
2024cited by 4position: lastdoi
Control Development and Fault Current Commutation Test for the EDISON Hybrid Circuit Breaker
IEEE Transactions on Power Electronics 2023cited by 61position: lastdoi
CLEAN: Cryogenic Link for Electric Aircraft Propulsion
IEEE Transactions on Applied Superconductivity 2023cited by 20position: middledoi
A Nonlinear Inductor-Based Fault Current Commutation Strategy to Enable Zero-Current Opening of the Mechanical Switch in a Hybrid DC Circuit Breaker
2023cited by 14position: lastdoi
Efficient DC Interrupter with Surge Protection (EDISON)
Power systems 2023cited by 4position: firstdoi
Evaluation Tests of Metal Oxide Varistors for DC Circuit Breakers
IEEE Open Access Journal of Power and Energy 2022cited by 30position: lastdoi
Lifetime-Based Selection Procedures for DC Circuit Breaker Varistors
IEEE Transactions on Power Electronics 2022cited by 20position: middledoi
Detection of Series Faults in High-Temperature Superconducting DC Power Cables Using Machine Learning
IEEE Transactions on Applied Superconductivity 2021cited by 15position: lastdoi
Piezoelectrically Actuated Fast Mechanical Switch for MVDC Protection
IEEE Transactions on Power Delivery 2020cited by 30position: lastdoi
Development of a High-Temperature Superconducting Gas-Insulated Power Cable
IEEE Transactions on Applied Superconductivity 2020cited by 14position: middledoi
Electrical faults in high temperature superconducting power cables for MVDC power systems of all-electric ships
IOP Conference Series Materials Science and Engineering 2020cited by 6position: middledoi
Understanding Surface Flashover in Helium Gas Cooled High Temperature Superconducting Devices
IOP Conference Series Materials Science and Engineering 2020cited by 3position: middledoi
Effect of Non-Uniformity of Electric Field on Breakdown Strength of Cryogenic Gaseous Insulation Media for Superconducting Power Applications
IOP Conference Series Materials Science and Engineering 2020cited by 1position: middledoi
Experimental setup to evaluate creepage distance requirements for shipboard power systems
2019cited by 12position: lastdoi
Versatile Paschen's model for the dielectric strength estimation of binary and ternary gas mixtures
IEEE Transactions on Dielectrics and Electrical Insulation 2019cited by 8position: middledoi
A New Representation of Paschen's Law Suitable for Variable Temperature Power Applications
2019cited by 5position: middledoi
Gas-Insulated High Temperature Superconducting Coaxial Dipole for MVDC Power Systems
2019cited by 3position: middledoi
Development of CORC <sup>®</sup> cables for helium gas cooled power transmission and fault current limiting applications
Superconductor Science and Technology 2018cited by 53position: middledoi
The influence of temperature on the dielectric strength of gaseous cryogens
2018cited by 13position: lastdoi
The dielectric strength of dissociated cryogenic gas media
Journal of Applied Physics 2018cited by 8position: lastdoi
High‐Temperature Superconducting Cable Design Based on Individual Insulated Conductors
Advances in Materials Science and Engineering 2018cited by 8position: middledoi
Implementation of Superconducting Cables in Medium Voltage DC Integrated Power Systems on All Electric Ships
2018cited by 7position: middledoi
Evaluating the dielectric strength of helium-nitrogen gas mixtures by plasma parameter measurements
Physics of Plasmas 2018cited by 5position: lastdoi
Exploration of Additive Manufacturing for HTS Cable Components for Electric Aircrafts
2018cited by 4position: middledoi
Effect of magnetic field on the dielectric strength of gaseous cooling media for superconducting applications
2018cited by 3position: lastdoi
Feasibility of Superconducting Gas-Insulated Transmission Lines for Electric Aviation Applications
2018cited by 2position: middledoi
Correction: Exploration of Additive Manufacturing for HTS Cable Components for Electric Aircrafts
2018cited by 1position: middledoi
A versatile modeling technique for predicting dielectric strength improvements in gas mixtures for superconducting applications [Oct 17 2755-2764]]
IEEE Transactions on Dielectrics and Electrical Insulation 2018cited by 0position: middledoi

Grants

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Frequent collaborators

Sastry Pamidi · Florida State University50 papers (2012–2023)Peter Cheetham · Florida State University25 papers (2015–2023)Chul Han Kim · Florida State University23 papers (2013–2023)Chanyeop Park · Georgia Institute of Technology17 papers (2016–2023)Michael Steurer · Florida State University15 papers (2013–2024)Matthew Bosworth · Florida State University11 papers (2015–2024)H. Rodrigo · Florida State University11 papers (2012–2017)Qichen Yang · Georgia Institute of Technology7 papers (2017–2025)Aws Al-Taie · Florida State University7 papers (2017–2020)Juan C. Ordóñez · Florida A&M University - Florida State University College of Engineering4 papers (2013–2016)Maryam Saeedifard · Georgia Institute of Technology4 papers (2017–2023)Nash Bonaventura · Florida State University4 papers (2023–2024)Yuchen He · Florida State University4 papers (2023–2024)Chunmeng Xu · Georgia Institute of Technology4 papers (2020–2023)Karl Schoder · Florida State University3 papers (2024–2025)D. Shah · Florida State University3 papers (2013–2014)Sihun Song · Florida State University3 papers (2023–2024)Dionne Soto · Florida State University3 papers (2015–2020)Jose G. Viquez · Florida State University3 papers (2017–2018)Nick G. Suttell · Florida State University3 papers (2013–2016)
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