Transformer insulating oil characteristic changes observed using accelerated degradation in consideration of field transformer conditions

Masanori Kohtoh, Genyo Ueta, Shigemitsu Okabe, +1

IEEE Transactions on Dielectrics and Electrical Insulation

Electrical EngineeringEngineeringAgingOil ComponentsCorrosion +6

Investigation of aging degradation status of insulating elements in oil-immersed transformer and its diagnostic method based on field measurement data

Shigemitsu Okabe, Genyo Ueta, Toshihiro Tsuboi

IEEE Transactions on Dielectrics and Electrical Insulation

Electrical EngineeringEngineeringDurability PerformanceDegradation StatusMechanical Engineering +8

New aspects of UHF PD diagnostics on gas-insulated systems

Shigemitsu Okabe, Genyo Ueta, Hiroyuki Hama, +3

IEEE Transactions on Dielectrics and Electrical Insulation

Uhf PdElectrical EngineeringPartial DischargeEngineeringMeasurement +12

Insulation performance of three types of micro-defects in inner epoxy insulators

Genyo Ueta, Junichi Wada, Shigemitsu Okabe, +3

IEEE Transactions on Dielectrics and Electrical Insulation

EngineeringAccurate Estimation TechniqueInsulation PerformanceInner Epoxy InsulatorsReliability Engineering +15

Applications of DC Breakers and Concepts for Superconducting Fault-Current Limiter for a DC Distribution Network

Yukinaga Morishita, T. Ishikawa, Iwao Yamaguchi, +3

IEEE Transactions on Applied Superconductivity

EngineeringDc Circuit BreakerPower Electronic SystemsPower ElectronicsDc Distribution Network +14

Influence of insulating spacer type on propagation properties of PD-induced electromagnetic wave in GIS

Masayuki Hikita, Shinya Ohtsuka, Genyo Ueta, +3

IEEE Transactions on Dielectrics and Electrical Insulation

Electromagnetic WaveElectrical EngineeringSpacer TypePartial DischargeEngineering +10

Dielectric properties of gas mixtures with per-fluorocarbon gas and gas with low liquefaction temperature

Junichi Wada, Genyo Ueta, Shigemitsu Okabe, +1

IEEE Transactions on Dielectrics and Electrical Insulation

EngineeringEnergy EfficiencyEnergy ConversionEnergy RecoveryPer-fluorocarbon Gas +17

Discussion on standard waveform in the lightning impulse voltage test

Shigemitsu Okabe, Jun Takami, Toshihiro Tsuboi, +3

IEEE Transactions on Dielectrics and Electrical Insulation

Electrical EngineeringEngineeringHigh Voltage EngineeringMeasurementElectrical Transmission +6

Electrical characteristics of natural and synthetic insulating fluids

Satoshi Arazoe, Daisuke Saruhashi, Yusuke Sato, +3

IEEE Transactions on Dielectrics and Electrical Insulation

Electrical EngineeringElectrohydrodynamicsEngineeringHigh Voltage EngineeringCharge Density +10

Insulation characteristics of GIS insulators under lightning impulse with DC voltage superimposed

Shigemitsu Okabe, Genyo Ueta, Tomoaki Utsumi, +1

IEEE Transactions on Dielectrics and Electrical Insulation

Insulation CharacteristicsElectrical EngineeringDielectricsEngineeringHigh Voltage Engineering +9