scholarly journals Detection of inter-turn faults in transformer winding using the capacitor discharge method

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 979-983
Author(s):  
Michał Michna ◽  
Andrzej Wilk ◽  
Michał Ziółko ◽  
Marek Wołoszyk ◽  
Leon Swędrowski ◽  
...  
Keyword(s):  
Diagnostic Method ◽  
Test Bench ◽  
Superconducting Magnets ◽  
Diagnostic System ◽  
Superconducting Magnet ◽  
Accelerator Facility ◽  
Capacitor Discharge ◽  
University Of Technology ◽  
Transformer Winding ◽  
Discharge Method

AbstractThe paper presents results of an analysis of inter-turn fault effects on the voltage and current waveforms of a capacitor discharge through transformer windings. The research was conducted in the frame of the Facility of Antiproton and Ion Research project which goal is to build a new international accelerator facility that utilizes superconducting magnets. For the sake of electrical quality assurance of the superconducting magnet circuits, a measurement and diagnostic system is currently under development at Gdansk University of Technology (GUT). Appropriate measurements and simulations of the special transformer system were performed to verify the proposed diagnostic method. In order to take into account the nonlinearity and hysteresis of the magnetic yoke, a novel mathematical model of the transformer was developed. A special test bench was constructed to emulate the inter-turn faults within transformer windings.

JSME Construction Standard for Superconducting Magnet of Fusion Facility “Procedure for Structural Design”

2009 ◽  
Author(s):  
Yukio Takahashi ◽  
Shigeru Tado ◽  
Kazunori Kitamura ◽  
Masataka Nakahira ◽  
Junji Ohmori ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Structural Design ◽  
Structural Integrity ◽  
Superconducting Magnets ◽  
Austenitic Stainless Steels ◽  
Superconducting Magnet ◽  
Fatigue Curve ◽  
Stress System ◽  
Allowable Stress ◽  
Fatigue Assessment

Superconducting magnets are structures which have an important role in Tokamak-type fusion reactor plants. They are huge and complicated structures exposed to very low temperature, 4K and the methods for keeping their integrity need to be newly developed. To maintain their structural integrity during the plant operation, a procedure for structural design was developed as a part of JSME Construction Standard for Superconducting Magnet. General structures and requirements of this procedure basically follow those of class 1 and class 2 components in light water reactor plants as specified in Section III, Division 1 of the ASME Boiler and Pressure Vessel Code, and include the evaluation of primary stress, secondary stress and fatigue damage. However, various new aspects have been incorporated considering the features of superconducting magnet structures. They can be summarized as follows: (i) A new procedure to determine allowable stress intensity value was employed to take advantage of the excellent property of newly developed austenitic stainless steels. (ii) Allowable stress system was simplified considering that only austenitic stainless steels and a nickel-based alloy are planned to be used. (iii) A design fatigue curve at 4K was developed for austenitic stainless steels. (iv) In addition to the conventional fatigue assessment based on design fatigue curves, guidelines for fatigue assessment based on crack growth prediction were added as a non-mandatory appendix to provide a tool of assurance for welded joints which are difficult to evaluate nondestructively during the service.

Multi-Field Coupling Simulation on Quench Process in Superconducting Magnet

2014 ◽  
Vol 926-930 ◽  
pp. 3096-3099
Author(s):  
Xing Long Guo
Keyword(s):  
Rational Design ◽  
Superconducting Magnets ◽  
Superconducting Magnet ◽  
Coupling Model ◽  
The Other ◽  
Protection System ◽  
Thermal Physics ◽  
Electromagnetic Process ◽  
Field Coupling ◽  
Practical Engineering

Quench protection system is a necessary part in superconducting magnets design. Rational design of quench protection system requires understanding of heat transfer and electromagnetic process in the magnet during quench process. A multi-field coupling model was developed to study quench process. This model sequentially solves two different physics environments, one is thermal physics environment, and the other one is electromagnetic physics environment. This model was applied to simulate one solenoid magnet in practical engineering. The main parameters results during quench process were presented. This research enriches the theory of numerical simulation on quench process of superconducting magnet, and provides theoretical guidance for the design of quench protection system.

High-Strength Nb3Sn Wire Development for Compact Superconducting Magnets

2007 ◽  
Vol 546-549 ◽  
pp. 1841-1848 ◽  
Author(s):  
K. Watanabe ◽  
Satoshi Awaji ◽  
Gen Nishijima
Keyword(s):  
High Field ◽  
Magnetic Energy ◽  
Superconducting Magnets ◽  
Small Diameter ◽  
High Strength ◽  
Superconducting Magnet ◽  
Hybrid Magnet ◽  
Superconducting Wires ◽  
External Reinforcement ◽  
Nb3sn Strand

A superconducting magnet with a magnetic energy of E = B2/2μo [J/m3] has to overcome a magnetic force of P = B2/2μo [Pa] in the same expression. This means that a high-field 20 T superconducting magnet produces an electromagnetic force of 160 MPa. In order to stand such a large force, Nb3Sn superconducting wires are usually reinforced by the hard-copper housing as an external reinforcement method or the stainless steel winding as a mechanical backup of an outermost Nb3Sn coil. If we focus on a compact superconducting magnet like a cryocooled superconducting magnet, a high-strength superconducting wire with a small diameter size of 1- 2 mm is required. The High-Field Laboratory for Superconducting Materials, IMR, Tohoku University has developed Nb3Sn wires internally reinforced with CuNb or CuNbTi composite. These high-strength Nb3Sn wires were successfully employed to construct the unique compact cryocooled 28 T hybrid magnet and the cryocooled 18 T high-temperature superconducting magnet. In addition, we found that the prebending effect for high-strength Nb3Sn wires outstandingly improves the Tc, Bc2 and Ic properties. As a next step, we intend to develop new Nb3Sn strand cables with the strong mechanical property of 500 MPa, applying the prebending effect for a future 22 T-φ400 mm room temperature bore superconducting magnet of a 50 T-class hybrid magnet.

JSME Construction Standard for Superconducting Magnet of Fusion Facility: “General View of the Code”

2009 ◽  
Author(s):  
Yuji Nakasone ◽  
Yukio Takahashi ◽  
Arata Nishimura ◽  
Tetsuya Suzuki ◽  
Hirosada Irie ◽  
...  
Keyword(s):  
Structural Design ◽  
Radiation Effects ◽  
Structural Integrity ◽  
Superconducting Magnets ◽  
Fusion Energy ◽  
Superconducting Magnet ◽  
General View ◽  
Deformation Control ◽  
Roles And Responsibilities ◽  
Set Up

The Japan Society of Mechanical Engineers (JSME) has set up and published the construction standard for superconducting magnet structures to be used in nuclear fusion facilities. The present target of the standard is tokamak-type fusion energy facilities, especially the International Thermonuclear Experimental Reactor called ITER for short. The standard contains rules for structural materials including cryogenic materials, structural design considering magnetic forces, manufacture including welding and installation, nondestructive testing, pressure proof tests and leak tests of toroidal field magnet structures. The standard covers requirements for structural integrity, deformation control, and leak tightness of all the components of the superconducting magnets and their supports except for superconducting strands and electrical insulators. The standard does not cover deterioration which may occur in service as a result of corrosion, radiation effects, or instability of material. The standard consists of seven articles and twelve mandatory and non-mandatory appendices to the articles; i.e., (1) Scope, roles and responsibilities, (2) Materials, (3) Structural design, (4) Fabrication and installation, (5) Non-destructive examination, (6), Pressure and leak testing, and (7) Terms used in general requirement. The present paper describes the general view of the standard. The detailed descriptions of the standard are described by the other papers in this session CS-21, being divided into four categories; i.e., (1) quality assurance, (2) materials, (3) structural design and replacement, and (4) welding, bonding and examination.

Investigation on Numerical Calculation of Thermal Boundary Resistance between Superconducting Magnets

2012 ◽  
Vol 217-219 ◽  
pp. 2505-2509 ◽  
Author(s):  
Hu Du ◽  
Gang Wu ◽  
Xiang Li ◽  
Ke Bi ◽  
Ji Ma ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Magnetic Energy ◽  
Superconducting Magnets ◽  
Superconducting Magnet ◽  
Boundary Resistance ◽  
Thermal Boundary Resistance ◽  
Knowing That ◽  
Calculation Results ◽  
Triangular Model ◽  
Magnetic Energy Storage

Aiming at the problem that thermal boundary resistance (TBR) has an effect on heat transportation of superconducting magnet when Superconducting Magnetic Energy Storage (SMES) is cooled directly, from perspective of numerical calculation, truncated cone, circular arc and triangular models are used to simulate the solid to solid contact surface, and finite element method is adopted to carry on numerical simulation calculation for thermal boundary resistance. With comparison and analysis of the calculation results of the three models, knowing that the value calculated with the triangular model when its control angle is 30° is close to the measured value and its relative error is 17%. Meanwhile, the error source is analyzed. This dissertation can be a good reference to the research on superconducting magnet heat transportation.

scholarly journals Operational Modal Analysis for Crack Detection in Rotating Blades

2017 ◽  
Vol 42 (1) ◽  
pp. 105-112 ◽  
Author(s):  
Jarosław Bednarz
Keyword(s):  
Modal Analysis ◽  
Vibration Analysis ◽  
Crack Detection ◽  
Diagnostic Method ◽  
Diagnostic System ◽  
Test Rig ◽  
Widespread Application ◽  
Vibration Signals ◽  
Rotating Blades ◽  
Diagnostics System

Abstract Vibration analysis has found widespread application for condition monitoring in a variety of applications and industries. With the continual development of cheaper and more powerful processing hardware, such systems have developed from utilizing simple checks on amplitude to those based around sophisti- cated spectral analysis. The paper presents application of the model based diagnostic method for early detection of faults in rotating machinery. The proposed diagnostics system based on modal analysis methods (OMA and OMAX methods). In the paper the diagnostic system based on such modelling is presented. The proposed system was verified during research on a specialized test rig, which can generate vibration signals.

scholarly journals Analyzing mechanical vibrations of an aircraft opposed piston engine

2021 ◽  
Author(s):  
Michał Biały ◽  
Łukasz Grabowski ◽  
Bartłomiej Skórzyński ◽  
Grzegorz Barański ◽  
Adam Majczak
Keyword(s):  
Test Bench ◽  
Piston Engine ◽  
Vibration Acceleration ◽  
Mechanical Vibrations ◽  
Drive Unit ◽  
Constant Torque ◽  
University Of Technology ◽  
Diesel Injection ◽  
Diesel Cycle ◽  
Acoustic Evaluation

The paper presents the results of the bench tests to measure mechanical vibrations of a new aircraft opposed piston engine with reciprocating pistons. The PLZ-100 engine is a three-cylinder, six-piston, two-shaft drive unit with a two-stroke diesel cycle. This type of engine is dedicated for powering light aircraft, e.g. autogyros. The tests were carried out on a test bench at the Lublin University of Technology. The engine was loaded with constant torque, for several fixed values of rotational speed of a crankshaft. The angle of the start of diesel injection was changed for each of the rotational speeds. The mechanical vibrations that accompanied the operation of this drive unit were recorded with three measurement transducers and a National Instruments conditioning system. Each of the transducers was mounted on a different axis of the engine. The signals were analyzed from their courses with the DIAdem software. The results were the courses of effective speed and vibration acceleration to conduct a vibration-acoustic evaluation of the PLZ-100, detect and prevent various types of defects or failures.

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