Distribution Network modelling and analysis of the application of HTS Transformer

aut.embargoNoen_NZ
aut.thirdpc.containsNoen_NZ
aut.thirdpc.permissionNoen_NZ
aut.thirdpc.removedNoen_NZ
dc.contributor.advisorLie, Tek Tjing
dc.contributor.advisorPrasad, Krishnamachar
dc.contributor.authorAbdul Rahman, Muhammad Azizi
dc.date.accessioned2012-10-10T02:46:37Z
dc.date.available2012-10-10T02:46:37Z
dc.date.copyright2012
dc.date.created2012
dc.date.issued2012
dc.date.updated2012-10-10T01:37:15Z
dc.description.abstractAdvancement of High Temperature Superconductor (HTS) materials has increased interest in research and development of superconducting transformers. One of the challenges in the design and development of HTS transformer is the modelling of load flow, system losses and over current phenomena to be experienced by the transformer. Even though HTS technology is claimed to offer better power system and other packaging benefits, the performance and reliability need to be proven and verified through the proper modelling of power system network. The study set up the electrical characteristics of a HTS transformer. The parameters need to be validated before any effort is to carry out to model the behaviour of a distribution network under a range of conditions. The characteristics is then adapted into existing network models and analysed under various system loading and over current conditions. The modelling is carried out on a three phase distribution feeder which is inherently unbalanced. The technical information on the HTS transformer is based on a preliminary baseline design. The exploration is intended to establish the performance of HTS transformers in comparison with that of conventional transformers. The short circuit design of a transformer is one of the most significant and challenging criteria. Additional generating capacity and interconnections due to the growth of electrical power demand have contributed to an increase in short circuit capacity of power networks. One of the consequences is that the short circuit duty to be undertaken by transformers becomes more severe. The short circuit strength of a transformer is designed to withstand through fault currents due to external short circuit. Any weakness in the strength may result in a mechanical collapse of windings and deformation to clamping structures. The internal faults initiated by the external short circuits may lead to bushing blowouts, tank bursting, fire hazard, etc. Meanwhile, the inrush current of a transformer can be as high as seven to ten times the rated current. Inrush current events are more frequent compared to short circuits. They also last for much longer time (few seconds) compared to short circuits (tens of milliseconds). The users are very anxious about the repeated switching of a transformer. Even though the inrush currents are usually not seriously looked into in the mechanical design considerations, the forces generated due to an extensive number of switching in a day may weaken the winding over a period of time. The continuous occurrences may lead to winding looseness and subsequent failure. The active development of HTS materials has led to extensive research and development studies of superconducting transformers worldwide. Considerable benefits have been accomplished with the introduction of HTS transformer such as reduced power loss, size and transformer weight. This study focuses on modelling the effects of various distribution network conditions towards a distribution HTS transformer and looks comprehensively into the thermal effects of short circuit current on various architectural designs and fault current limiting properties of HTS transformer winding conductor. Recent advancement in the design technology has looked into the HTS transformer’s ability to also perform as Fault Current Limiter (FCL). This study presents the computation of the thermal effects of short circuit currents on a non-FCL HTS transformer and demonstrates how it will behave with a HTS-FCL winding conductor.en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/4643
dc.language.isoenen_NZ
dc.publisherAuckland University of Technology
dc.rights.accessrightsOpenAccess
dc.subjectDistribution Networken_NZ
dc.subjectModellingen_NZ
dc.subjectHTS Transformeren_NZ
dc.subjectShort Circuiten_NZ
dc.subjectInrushen_NZ
dc.subjectThermal Effecten_NZ
dc.titleDistribution Network modelling and analysis of the application of HTS Transformeren_NZ
dc.typeThesis
thesis.degree.discipline
thesis.degree.grantorAuckland University of Technology
thesis.degree.levelDoctoral Theses
thesis.degree.nameDoctor of Philosophyen_NZ
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