internal turn-turn faults (ttf) are the most common failures in power transformers, which could seriously reduce their life expectancy. although common protection schemes such as current-baseddifferential protection are able to detect some of the internal faults, some other minor ones (such as ttfs andshort circuit near the neutral point) cannot be detected by such schemes. likewise, these rela...

This paper presents a Scott transformer model to be applied in electromagnetic transients (EMT) programs, particularly the absence of detailed for performing real-time simulations (RTS). Regarding transformer, common topology converting three-phase network into two single-phase networks, EMT programs is essential simulate large-scale electric railway systems. A code-based has been developed RTS...

rotection schemes employing the differential relaying principle exhibit certain limitations in applications with power transformers. This is because the detection of a differential current does not clearly distinquish between internal faults and other possible conditions. Among the phenomena most likely to upset the current balance and cause the relay to malfunction are inrush magnetizing curre...

Engineering aspects of electron and positron injection, storage and extraction in a damping ring of an injection complex are described. Symmetrical strip-line type kickers are used in quasi-traveling wave mode. A generator of a pair of negative and positive polarity pulses bases on two double pulse forming network (DPFN). Both DPFN are charged up to 50 kV using a common pulse transformer. Every...

This paper presents a 4th order CLCL resonant converter which is suitable for constant current power supply applications. This converter is designed with Immittance characteristic with two inductors and two capacitors in resonant network. A detailed analysis and design process of a 200w converter as a constant current supply have been provided and simulation results are verified with results of...

This paper presents a new three-phase step-up dc–dc converter with a three-phase high-frequency (HF) isolation transformer in a current-mode controlled closed loop. The converter’s main characteristics are reduced input ripple current, step-up voltage, HF transformer, reduced output voltage ripple due to threepulse output current, and the presence of only three active switches, this being a mai...

Commutation failure is a common fault for line-commutated converters in the inverter. To reduce the possibility of commutation failure, many prediction algorithms based on alternating current (AC) voltage detection have already been implemented in high voltage direct current (HVDC) control and protection systems. Nevertheless, there are currently no effective methods to prevent commutation fail...

The traction transformer of the traction drive system of a high-speed train is one of the main equipments for energy conversion. The transformer loss will be increased by load harmonics and pantograph arcs at high speed. It is very important to predict losses for the improvement of traction transformer design. In this paper, a dynamic model of the pantograph-catenary system is established using...

In dual active bridge (DAB) converters, there can be transformer current ringing, especially when the turns ratio is high. It induced by high dv/dt generated fast switching as well low impedance of magnetic tank at high-frequency range. To quantify influence tank, its model thoroughly modeled considering all parasitic components. found that capacitors magnetics do not equally affect and thereby...