power transformers are key components in electrical power supplies and their failure could cause severe consequences on continuity of service and also generates substantial costs. identifying problems at an early stage, before catastrophic failure occurs, is a great benefit for reliable operation of power transformers. frequency response analysis (fra) is a new, well-known and powerful diagnost...

In electrical networks of almost all voltage classes, the main link in work on transmission energy is a power transformer. At moment, about 60% them are operated our country with significant excess service life, which increases requirements for their technical control and diagnostics units. Switching devices an integral part transformers. They necessary to regulate substation busbars depending ...

power transformers provide a vital link between the generation and distribution of produced energy. such static equipment is subjected to abuse during operation in generation and distribution stations and leads to catastrophic failures. this paper reviewed the techniques in the field of condition monitoring of power transformers in recent years. transformer monitoring and diagnosis are the effe...

This thesis describes how to provide standardized, current based, differential protection for any three-phase power transformer, including phase-shifting transformers with variable phase angle shift and transformers of all construction types and internal on-load tap-changer configurations. The use of standard transformer differential protection for such applications is considered impossible in ...

The detection of On-Load Tap-Changer (OLTC) faults at an early stage plays a significant role in the maintenance power transformers, which is most strategic component network substations. Among OLTC fault methods, vibro-acoustic signal analysis known as performant approach with ability to detect many different types. Extracting characteristic features from measured envelopes promising precisely...

With the advent of new loads and generation on low voltage grid, fluctuation has increased, especially in active distribution grids with a high penetration distributed resources large deployment electric vehicles. The coordination different technologies emerged as best way for regulation, among others, smart inverters, open soft points or transformers on-load regulation capability. This paper p...

Abstract The flexible on-load transformer can be adapted to different application scenarios by adding power electronic converter structures through the use of existing transformers. In this paper, a regulator structure based on floating capacitor multi-level AC/AC is proposed, which compensate input voltage primary side in same direction or opposite direction, combine with tap-changer, and also...