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Any failures in these equipments directly reduce network reliability and increase maintenance costs. Consequently, the preventive maintenance techniques are increasingly developed. In this regard, frequency response analysis is an appropriate method in order to diagnose any change which occurs in transformer physical construction. This contribution has been concentrated on fault diagnosis by use of...
Transformers have emerged as an integrated part of a power system. Any fault in the transformer can cause a severe outage, which therefore necessitates continuous monitoring and diagnostics of its operation. The renewed thrust in smart power system networks along with the development of advanced methods in the monitoring and diagnostics has resulted in major impetus to research in the related domain...
Within paper are analysed the transient processes both on high voltage transformers used in power stations. In order to eliminate the undesired effects, there are analysed means and methods of limiting the current peak are presented experiments performed on single-phase and three-phase transformers through optimal establishing connection angle. Comparatively are analysed transient regime at short-circuit...
DC biasing current through the neutral point of ac power transformer would lead the power transformer to generate more vibration and sound, this will do harm on power transformers’ core pieces or windings and finally will threaten the safe operation of the transformers. This paper described the principle of DC biasing, designed a new DC biasing experiment to analyze how the experimental transformer’s...
DC biasing current through the neutral point of ac power transformer would lead the power transformer to generate more vibration and sound, this will do harm on power transformerspsila core pieces or windings and finally will threaten the safe operation of the transformers. This paper described the principle of DC biasing, designed a new DC biasing experiment to analyze how the experimental transformerpsilas...
With the improvement of high temperature superconductor (HTS) practical performance, research and development with regard to practical applications of HTS transformers have been progressed actively in the world. The current focus on the applied superconducting technology for HTS transformers has been moving to the industrial preparations from the laboratory research stage, and the technology has been...
A multipoint fiber-optic temperature sensor network integrated inside a power transformer for continuous monitoring of hot-spots on windings, cellulose insulations, and oil, is demonstrated and tested. The temperature sensors are based on proprietary encapsulated fiber Bragg grating (FBG) sensors and the optical interrogation unit uses a special designed narrowband high power broadband fiber source...
A transformer is a device that transfers electrical energy from one circuit to another by magnetic coupling without requiring relative motion between its parts. It usually comprises two or more coupled windings, and, in most cases, a core to concentrate magnetic flux. An alternating voltage applied to one winding creates a time-varying magnetic flux in the core, which induces a voltage in the other...
In this paper we present the conjugate heat transfer analysis in a 167 kVA dry type transformer using the parallel version of the CFD code Fluent 6.0. The RNG kappa-epsiv model is proposed to compute the turbulent aspect of the convective airflow inside the transformer metal tank, for ANAN (air natural air natural) cooling conditions. An experimental approach was used to assess Joule losses in the...
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