Blar i NTNU Open på forfatter "Niayesh, Kaveh"
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A novel arrangement for improving three phase saturated-core fault current limiter (SCFCL)
Arab Baferani, Mohammadreza; Rostaghi Chalaki, Mojtaba; Fahimi, Navid; Shayegani Akmal, Amir Abbas; Niayesh, Kaveh (Chapter, 2018)Fault current limiter (FCL) is a device that has low impedance in normal state of the power network and has simultaneous large impedance in the time of fault, so that it would lead to limitation of the fault current. Among ... -
A Probabilistic Model-aided Failure Prediction Approach for Spring-Type Operating Mechanism of High Voltage Circuit Breakers
Razi Kazemi, Ali Asghar; Niayesh, Kaveh; Nilchi, Reza (Journal article; Peer reviewed, 2018)To avoid failures in circuit breakers (CBs) and to extend the lifetime of these critical components, condition-based-maintenance has been increasingly requested by utilities to enable them to efficiently manage their assets. ... -
Ablation-assisted load current interruption in medium votage switchgear
Taxt, Henning (Doctoral theses at NTNU;2019:5, Doctoral thesis, 2019)The switching of loads and feeders in medium voltage (1-52 kV) networks is essential to the operation of distribution networks. Thus, medium voltage load-break switches are abundant in networks today and could become even ... -
Aging of a high voltage insulation system exposed to AC sinusoidal and fast rise time repetitive pulses
Alfer, Mads (Master thesis, 2019)Med den forventede storskala integreringen av fornybare energikilder med variabel kraft produksjon krever bruk av kraftelektronikkomformere. De raskt stigende repeterende pulsene generert fra på og av operasjoner har en ... -
Air flow and arc cooling in load break switch
Nyhus, Olav (Master thesis, 2017)Current interruption is a complex process, and optimizing the design of a medium voltage load-break switch is difficult. The dominating technology for load-break switches in medium voltage switchgear is using SF6 as ... -
Arc Voltage Characteristics in Ultrahigh-Pressure Nitrogen Including Supercritical Region
Abid, Fahim; Niayesh, Kaveh; Jonsson, Erik; Støa-Aanensen, Nina Sasaki; Runde, Magne (Journal article; Peer reviewed, 2017)A supercritical (SC) fluid is formed when both pressure and temperature of a fluid exceed the critical point, where distinct gas and liquid phases no longer exist. SC fluids demonstrate combined properties of gas and liquid, ... -
Arc Voltage Distribution Measurement in Tube Constricted Ultrahigh-Pressure Nitrogen Arc
Abid, Fahim; Niayesh, Kaveh; Støa-Aanensen, Nina Sasaki (Chapter, 2020)This work contributes to the fundamental understanding of axial voltage distribution of the arc burning inside polytetrafluoroethylene (PTFE) tube at very high filling pressures of nitrogen. The arc peak current of 85 A ... -
Breakdown at Multiple Protrusions and Surface Roughness in SF6 and CO2 - A Study of the Enlargement Law
Feet, Odd Christian (Master thesis, 2018)Gas insulated components are important in the modern transmission system. The most common gas used in high pressure insulation is Sulphur Hexafluoride (SF6). SF6 has beenclassified as a greenhouse gas and a potential ... -
Breakdown at Multiple Protrusions in SF6 and CO2
Feet, Odd Christian; Seeger, Martin; Over, Daniel; Niayesh, Kaveh; Mauseth, Frank (Peer reviewed; Journal article, 2020)The electric breakdown at single and multiple protrusions in SF6 and CO2 is investigated at 0.4 and 0.6 MPa, respectively. Additionally, the breakdown fields at rough surfaces of two different areas were determined. From ... -
Comparative study on various dielectric barriers and their effect on breakdown voltage
Forouzan, Elham; Shayegani Akmal, Amir Abbas; Niayesh, Kaveh; Lin, Jeremy; Sharma, Desh Deepak (Journal article; Peer reviewed, 2018)Non-pressurised air is extensively used as basic insulation medium in high-voltage equipment. Unfortunately, an inherent property of air-insulated design is that the system tends to become physically large. On the other ... -
Condition Monitoring of High Voltage Circuit Breakers: Past to Future
Razi Kazemi, Ali Asghar; Niayesh, Kaveh (Journal article; Peer reviewed, 2020)High voltage circuit breakers (HVCBs) play a critical role on providing the desired reliability, and resiliency in power systems. In order to extend their lifetime and predict the failures, various maintenance policies ... -
Conductivity Measurement in Switching Arcs using Electric Probes
Settendal, Torjus Ramm (Master thesis, 2017)Due to its excellent arc quenching capability, SF6-gas is widely used for medium voltage switchgear. Because it is a highly potent greenhouse gas, it is expected to be many restrictions for the allowed use of this gas in ... -
Consideration of Arc Flash Development in a Switchboard Installed in Hazardous Area
Prates Cardoso, Isabela (Master thesis, 2021)Arc flash happens when current passes between two separated electrodes through air, and it can occur in any electrical installation. Arc is a heat source that can lead to fire and explosions. Switchboards are a key ... -
Contact Degradation in Air Load Break Switches by Making Operation under Short Circuit Condition
Strand, Marius (Master thesis, 2021)Koblingsutstyr er sentralt for et velfungerende og pålitelig strømnett. I distribusjonsnettet kan lastbrytere benyttes som et konkurransedyktig alternativ til effektbrytere. Dette kan derimot føre til andre utfordringer. ... -
Current interruption performance of ultrahigh-pressure nitrogen arc
Abid, Fahim; Niayesh, Kaveh; Espedal, Camilla; Støa-Aanensen, Nina Sasaki (Peer reviewed; Journal article, 2020)In this paper, the influence of gas filling pressure on the current interruption performance of different switch configurations with electric arcs burning in nitrogen has been experimentally investigated. A synthetic circuit ... -
DC Current Interruption Based on Vacuum Arc Impacted by Ultra-Fast Transverse Magnetic Field
Hashemi, Ehsan; Niayesh, Kaveh (Peer reviewed; Journal article, 2020)In this paper, the effect of an external ultrafast transverse magnetic field (UFTMF) on a vacuum arc in the diffused mode has been studied. According to the results of studies, a novel approach for making a zero-crossing ... -
Design of a Circuit for Making Test for Load Break Switches
Prieto Almanza, Alejandro Nahum (Master thesis, 2017)A synthetic circuit for making test for load break switches was explained and designed in this master thesis following the IEC standard requirements. Also the voltage drop across the triggered vacuum switch and across the ... -
Effect of Filling Pressure on Post-Arc Gap Recovery of N2
Abid, Fahim; Niayesh, Kaveh; Viken, Egil; Støa-Aanensen, Nina Sasaki; Jonsson, Erik; Meyer, Hans Kristian Hygen (Peer reviewed; Journal article, 2020)Experimental investigation of the effect of filling pressure on the post-arc dielectric recovery characteristics of nitrogen is reported in this paper. A half-cycle arc current duration of 540 μs followed by a 10 kV pulse ... -
Effect of filling pressure on Thermal Reignition Performance of free burning ultra-high Pressure Nitrogen arc
Basavapura Thimmappa, Shashidhara (Master thesis, 2018)The aim of this thesis is to study the thermal reignition characteristics of the free burning arc in SC nitrogen medium. Rate of change of current before interruption and rate of rise of recovery voltage (RRRV) after ... -
Effects of Fast Elongation on Switching Arcs Characteristics in Fast Air Switches
Kadivar, Ali; Niayesh, Kaveh (Journal article; Peer reviewed, 2020)This paper is devoted to investigating the effects of high-speed elongation of arcs inside ultra-fast switches (ucontact≈ 5–80 m/s), through a 2-D time-dependent model, in Cartesian coordinates. Two air arcs in series, one ...