Browsing NTNU Open by Author "Dorraki, Naghme"
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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. ... -
An Experimental Study of Short-Circuit Current Making Operation of Air Medium-Voltage Load Break Switches
Dorraki, Naghme; Niayesh, Kaveh (Peer reviewed; Journal article, 2022)Replacing SF 6 , the most potent greenhouse gas, with an alternative gas is a challenge faced by medium-voltage load break switches (MV-LBS). Air is a possible alternative, but there are some challenges regarding low ... -
Impact of pre-strike arc on contacts degradation after short cir- cuit current making operation in medium voltage air load break switches
Dorraki, Naghme; Strand, Marius; Niayesh, Kaveh (Chapter, 2021)Medium voltage load break switches are required to perform a number of making operation while passing of short circuit current that could be more than tens of kiloamperes. Using air-filled devices as an alternative to SF6, ... -
Investigation on Fault Current Making in Medium Voltage Switchgear in Air
Dorraki, Naghme (Doctoral theses at NTNU;2022:106, Doctoral thesis, 2022)Closing a switch under a fault condition could result in extensive electrical contact wear and a possible switch failure. A load break switch (LBS), as one of the critical components in medium voltage (MV) power grids, ... -
Optical investigation on pre-strike arc characteristics in medium-voltage load break switches
Dorraki, Naghme; Niayesh, Kaveh (Journal article, 2021)Medium voltage load break switches (MV-LBS) should pass fault current while closing and be able to re-open for the next operation. Replacing SF6 as a high impact greenhouse insulating gas with air, makes the switch design ... -
Spectroscopic Investigation of Metal Content in Prestrike Arc During Making Operation in a Low-Current Model Switch
Dorraki, Naghme; Niayesh, Kaveh (Journal article; Peer reviewed, 2020)Energy dissipation during prestrike arc is the critical factor for electrical contacts erosion and welding in medium voltage load break switches. Using air-filled devices as an alternative to SF₆ makes the switch environmentally ...