Design, implementation and verification of gas insulated load break switch at 12 kV voltage level /

Harmanlı, Ayşe Beril
In this thesis, the engineering design contributions on arc extinguishing method, relevant arc stretching issue, selection of magnet to obtain expected magnetic force, contact structure and magnet selection parameters, insulation medium properties and design effects, operation mechanism, arc modeling and derivation of the design arc modeling formula on 12 kV SF6 gas insulated load break switch is handled. By these contributions of the thesis, the design, prototype manufacturing and verification of the design via testing at an accredited laboratory is investigated. Literature survey is completed related to arc models, arc extinguishing methodology and operation mechanism. As the outcome of this literature survey and the market search the designed load break switch is implemented with an arc extinguishing method based on forcing the arc to diminish via the magnetic force effect of the magnet within contacts. As the operation mechanism, rotation around central axis is applied. The arc extinguishing method and mechanism structure selection are based on the design target of extinguishing the arc in less duration within less separation between contacts compared with other products in market. Arc models starting with Cassie and Mayr models are investigated, and the Cassie model is selected as the most suitable model. Derivation of the Cassie formula and its application on the design is studied. Maxwell and Matlab simulation results are investigated and compared with the mathematical calculations. The SF6 gas parameters as the insulation level are studied and simulated. Contact structure and magnet selection parameters with the spring constant calculations are studied.


Modeling and design of iron-core shunt reactors with discretely distributed air-gaps
Dönük, Atilla; Ermiş, Muammer; Bilgin, Hazım Faruk; Department of Electrical and Electronics Engineering (2012)
In this research work detailed parallel and series equivalent circuits of a gapped iron-core shunt reactor with discretely distributed gaps are derived. The validity of the recommended equivalent circuits is verified by Finite Element Analysis and laboratory tests. Effects of fringing flux and discretely distributed gaps on inductance parameters and reactor losses are also investigated. Moving Strip Method for discretely distributed gapped shunt reactors is recommended. Two design procedures for shunt react...
Design and implementation of advanced pulse width modulation techniques and passive filters for voltage source inverter driven three-phase ac motors
Nebi, Onur Çetin; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2010)
Advanced pulse width modulation (PWM) techniques such as space vector PWM, active zero state PWM, discontinuous PWM, and near state PWM methods are used in three-phase AC motor drives for the purpose of obtaining low PWM current ripple, wide voltage linearity range, and reduced common mode voltage (CMV). In some applications, a filter is inserted between the inverter and the motor for the purpose of reducing the stresses in the motor. The motor current PWM ripple components, terminal voltage overshoots, sha...
Design and implementation of coupled inductor Cuk converter operating in continuous conduction mode
Ayhan, Mustafa Tufan; Ersak, Aydın; Department of Electrical and Electronics Engineering (2011)
The study involves the following stages: First, coupled-inductor and integrated magnetic structure used in Cuk converter circuit topologies are analyzed and the necessary information about these elements in circuit design is gathered. Also, benefits of using these magnetic elements are presented. Secondly; steady-state model, dynamic model and transfer functions of coupled-inductor Cuk converter topology are obtained via state-space averaging method. Third stage deals with determining the design criteria to...
Beforehand obtaining a safety operation condition by using daily load curves in transient stability and graphical software for transient stability applications
Öztop, Celal; Ertaş, Arif; Department of Electrical and Electronics Engineering (2005)
In this thesis, relationship between two most important transient stability indices, critical clearing time and generator rotor angle is examined for one machine-infinite bus system and then extended to the multimachine case and is observed to be linear. By using the linear relationship between critical clearing time and generator rotor angle and utilizing the daily load curve, a new preventive method is proposed. The aim of this method is to make all critical clearing times longer than the relay and circui...
Implementation of sensorless vector control drive with current position estimation
Filci, Tayfun; Ertan, Hulusi Bülent; Department of Electrical and Electronics Engineering (2016)
In this thesis, an algorithm will be developed and implemented online for the estimation of rotor position from the rotor slot harmonics in stator currents. Experiments will be done on an inverter driven induction motor hardware, and the performance of the position detection algorithm will be evaluated in comparison with commercial encoder outputs.
Citation Formats
A. B. Harmanlı, “Design, implementation and verification of gas insulated load break switch at 12 kV voltage level /,” M.S. - Master of Science, Middle East Technical University, 2014.