Transformer fault diagnosis and repair is a complex task that includes many possible types of faults and demands special trained personnel. In this paper, Petri Nets are used for the simulation of transformer fault diagnosis process and the definition of the actions followed to repair the transformer. An oil thermometer and a Buchholz relay are used for transformer fault detection. Simulation r...

this paper concerns the design and analysis, of a ball type continuously variable transmission, (b-cvt). this b-cvt has a simple kinematic structure, and same as a toroidal cvt, transmits power by friction on the contact points between input and output discs, that are connected to each other by balls. after, a brief introduction of our b-cvt structure, the performance and traction efficiency of...

Abstract The electrified railway has power quality problems such as three phases seriously unbalanced, large harmonics, and reactive power. In addition, the neutral section exists at each supply section, which restricts development of high-speed heavy-haul railway. This paper proposes a novel co-phase traction system (TPSS) based on YNvd balanced transformer, can not only solve above but also s...

Real-time thermal capacity estimation is not only part of prognostics and health management but also determines the dynamic loading capability traction transformer. The hot-spot temperature (HST) vital parameter for real-time estimation. In high-speed railway, unbalanced loads two phases transformer cause winding losses therefore affect top-oil further influence HST in each phase. order to expl...

One of transient phenomenon that causes the mal-operation of the power transformer differential protection during the energization of a loaded power transformer is the ultra-saturation phenomenon. In this paper, a new model for investigating the ultra-saturation phenomenon during the energization of a loaded power transformer is presented and its effect on the differential protection of the pow...

Transformers and circuit breakers are essential equipment in traction power supply systems. Once a fault occurs, it will affect the train’s regular operation even threaten passengers’ personal safety. Therefore, is to diagnose faults of transformers system. At present, companies have made many achievements diagnosis equipment, but there still problems with real-time accuracy. The Internet Thing...

Risk assessment for power transformer is an important means to guide the condition based maintenance of transformer and enhance the reliability of power system operation, but also to strengthen the power transformer to provide an important basis for quality control. In this paper, an index system for comprehensive evaluation of transformer is put forward and a risk assessment model for power tr...