Abstract The power transformer is one of the important pieces equipment in grid system, and its normal operation related to safety reliability whole system. There are many factors influencing vibration operation, characteristics complex, so it difficult be directly used for state analysis. This paper proposes a method signal analysis based on continuous wavelet time-frequency graph. segmented s...

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...

Deep learning models have been widely used in time-series numerical prediction of atmospheric environmental quality. The fundamental feature this application is to discover the correlation between influencing factors and target parameters through a deep network structure. These relationships original data are affected by several different frequency factors. If adopted without guidance, these co...

Abstract Aiming to extract efficiently the fault features of partial discharge in process diagnosis power transformer, a method combining Empirical Wavelet Transform (EWT) with Multiscale Permutation Entropy (MPE) is advanced transformers discharge. Firstly, four different pulse signals are analyzed by EWT method, and signal decomposed according frequency domain characteristics obtain intrinsic...

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...

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 integrated safety detector relay is used for transformer fault detection. Simulation result...

According to the chronological literature survey, there exist three types of the on-chip transformer i.e the traditional on-chip passive transformer, the Distributed active transformer (DAT), and the CMOS gyrator-C active transformer (Yuan 2007). Formerly, there exist many review articles on the on-chip transformer. However, these articles focus on the on-chip passive transformer due to its ren...

Transformer is the power equipment of power system core. Intelligent monitoring and operation of transformer can not only monitor the full range of the transformer, the realization of state evaluation, it should be required repair, maintenance required good, but also on the latent fault early diagnosis and prediction. Research on transformer intelligent monitoring and operating technology of sa...

A contactless power transfer system for charging electric vehicles requires a high efficiency, a large air gap, and a good tolerance to lateral misalignment and needs to be compact and lightweight. A double-sided winding 10 kW transformer based on a 1.5 kW H-shaped core transformer was developed for a rapid charger. Even though the transformer capacity was increased, the dimensions of the 10 kW...