Windings

Transformer Winding Machine winds the transformer when number parameters are given to the machine as input. Transformers are used in Voltage Regulator, Voltage Stabilizer, Power Supply, Welding Machine, etc. The different types of transformer are Step up and Step down Transformer, Power Transformer, Distribution Transformer, Instrument transformer comprising current and Potential Transformer, Single phase and Three phase transformer, Auto transformer, etc. Our machine can manufacture small transformers which are most commonly used for increasing low AC voltages at high current (a step-up transformer) or decreasing high AC voltages at low current (a step-down transformer) in electric power applications, and for coupling the stages of signal processing circuits. Transformer Winding Machine reduces time and human effort. It replaces manually built transformer. It will increase the transformer winding speed and thus will increase the transformer production. Transformer winding machine can be used in small scale and medium scale industries for transformer production. Also in medium industries loss of electricity they also records of processing winding which result loss of some windings coil because they have no record about how many turns & steps are done. By using this machine it keeps record stores record how many turns & steps done when electricity loss & we can start from where machine is stopped due to loss of electricity

This study presents a detailed analysis of both near and far stray magnetic fields of dry-type distribution transformers. The results of 3D eddy-currents simulations performed on real-life transformer geometries along with the modeling details are presented. The extensive verification of the simulation results was performed by comparison against measurements with the aim of objectively quantifying the achieved simulations accuracy. The obtained results showed a high accuracy level in our simulations, allowing for design to be based on simulations with shorter development time and costs compared to the previous predominantly prototypes based design.

Rotating magnetic field eddy-current (RoFEC) probe for nondestructive evaluation of steam generator tubes in a nuclear power plant offers an alternate method that has compact configuration and higher speed compared to traditional bobbin coil, rotating probe coils, and array probes. This paper investigates the feasibility of the proposed RoFEC eddy-current probe which is composed of three windings excited by three-phase ac current and does not require mechanical rotation of probe. Results of finite-element modeling using reduced magnetic vector potential (RMVP) formulation are presented for modeling the inspection of ferromagnetic and nonferromagnetic tubes. Design parameters of the excitation coils and GMR pick-up sensor are optimized by means of a parametric study.

This paper presents a semi-analytical finite element method to derive the slot leakage inductance of rotating electrical machines with double-layer windings. The proposed method combines the lower computational burden of analytical equations and the accuracy/flexibility of the finite element method. Moreover, only a two-dimensional finite element simulation of one slot pitch is required. This method can be applied to an arbitrary slot geometry and winding configuration. The slot leakage inductance of a 12-slot and 10-pole tooth-coil-winding permanent-magnet synchronous machine was evaluated through the proposed method and only finite element method simulation. Three different slot shapes with vertical and horizontal coil sides arrangements were considered in the analysis. The results show that the semi-analytical method provides accurate results and low computational times.

This paper presents the analysis, design, simulation and experimental results of a full bridge zero voltage switched phase shift DC-DC converter, working with an internal frequency of 250 kHz, with an output power of 1 kW. The converter uses a two windings inductor with the secondary connected to the output by means of two clamping rectifier diodes, to allow resonant commutation of the passive to active leg of the converter. With this process it is possible to improve the efficiency of the converter

ABSTRACT One of major problems related with PV-applications is common mode currents. The issue can be solved in two ways: galvanic decoupling of AC-grid and chopping the common mode currents by additional actively controlled circuitry. Flyback converter is good solution for MPPT tracking for PV-modules up to 100-150 W with galvanic decoupling. The problem of designing of this type of converter is that most of design guides and literature is dedicated to consumer electronics applications. MPPT converter design have different starting points of calculations. The paper contains the suggested approaches to the calculations, design recommendations, considering the specific nature of PV-sources and NOCT model of PV-module. The approach calculations, design guidelines, recommendations and simulation of power electronics part of MPPT converter and experimental results with implemented circuit are presented and discussed. In order to increase the efficiency during tests the circuit was upgraded with active clamp. After the tests active clamp was upgraded to the forward active clamp topology. The efficiencies and key waveforms of voltages are compared and analyzed.

Monitoring and diagnosis of power transformer in power systems have been examined and debated significantly in last few decades. Recently, more researchers have expressed their interest in these issues as the utilities and network operators operating under a rising cost-effecting pressure. Especially, in studying to monitor winding faults which is found to be the most common fault within transformers. This paper addresses the issue of the effect of inter-windings short circuit fault in a Dyn11 connected transformer. The specific aim is to study the effect of fault at winding of other phases to the response of measured phase. Frequency Response Analysis (FRA) which is discovered to be a powerful and sensitive method to examine and evaluate the condition, including the mechanical reliability of the transformer windings is used.