Power transformer is one of the most important equipments in the electric system. Dissolved Gases Analysis is an important method in the diagnosis of internal fault of transformers. Because the signs and types of fault have complicated nonlinear relations, the traditional methods cannot exactly meet the requirements of engineer application. This paper proposes synthesis of relational grey incid...

In order to conduct safe and efficient flow management of motor or transformer oil, it is necessary to implement specific waste oil analysis and treatment in order to protect the environment and people’s health and safety. The study presents analysis and treatment of waste oil in the electric power distribution companies, showing some data of the MH ''ERS” ZEDP “Elektro-Bijeljina” joint-stock c...

A virtual instrumentation based scheme is developed for the characterization of magnetic materials. The principle used for measurement is derived from the comparison method of testing instrument transformers. A prototype has been developed by suitably modifying an instrument transformer test set. Characterization of magnetic materials at single frequency and multiple frequencies have been carri...

Kerr electro-optic technique has been used to measure the electric field distribution in high voltage stressed dielectric liquids, where the difference between refractive indices for light polarized parallel and perpendicular to the local electric field is a function of the electric field intensity. For transformer oil, the most widely-used insulating liquids in power apparatus and high voltage...

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This paper is about an open multi-physics modelling problem resulting from recent investigations into plasma generation by piezo-electric transformers. In this first approach, the electric field distribution surrounding the transformer is studied according...

This paper presents an electro-thermal hydrodynamic model that explains the development of different streamer modes in transformer oil. The focus is on the difference between the slow 2 and fast 3 mode streamers discussed in the literature. Through the use of numerical methods the model demonstrates that streamer modes arise in transformer oil due to the electric field dependent molecular ioniz...