Evaluation of transformer overloading capability

Abstract

SUMMARYThe evaluation of transformer overload capabilities definitely leads into complex variables affecting the functional life of the power and distribution transformer. The combined effect of thermal overloads, mechanical stresses due to transient over-voltage and other parameters relating to the transformer components other than windings must be taken into account. A transient analysis and temperature rise programme is implemented on the information system.

Sub-Synchronous Resonance damping using Distributed Static Series Compensator (DSSC) enhanced with fuzzy logic controller

“…Furthermore, the DSSC modules will handle extra duties if are enhanced with supplementary controllers. Previously, the authors precisely clarified the ability of the DSSC in mitigating the adverse oscillation namely LFO and SSR with CDCs [26][27][28]. So, this study focuses on designing a FLBDC which will be supplemented to the traditional controller of the DSSC in order to alleviate the SSR.…”

“…The distributed concept of the DSSC provides much lower cost and higher reliability than the SSSC, but has the same capability as the SSSC. Quite few papers have attempted the modeling and interrogating of the D-FACTS capabilities, for example, in [26][27][28] authors proposed low frequency oscillation damping, Transient Stability Enhancement and the Sub-Synchronous Resonance alleviation with the DSSC. In [28] the authors have proposed a conventional supplementary damping controller for the DSSC to mitigate the SSR and the damping controller parameters have been obtained with trial and error method.…”

“…Quite few papers have attempted the modeling and interrogating of the D-FACTS capabilities, for example, in [26][27][28] authors proposed low frequency oscillation damping, Transient Stability Enhancement and the Sub-Synchronous Resonance alleviation with the DSSC. In [28] the authors have proposed a conventional supplementary damping controller for the DSSC to mitigate the SSR and the damping controller parameters have been obtained with trial and error method. In this paper, the DSSC is enhanced with two separate supplementary controllers (FLBDC and the PSO based conventional controller) in order to mitigate the unfavorable oscillations which are caused by the SSR.…”

Effect of Loads and Other Key Factors on Oil-Transformer Ageing: Sustainability Benefits and Challenges

“…In Figure 2 an alternative basic thermal diagram of oil transformers is represented, as proposed in [31], where a cross section of an oil transformer is shown.…”

A robust algorithm based on a failure-sensitive matrix for fault diagnosis of power systems: an application on power transformers

“…That is why it is important to know the hot-spot temperature at every moment during real transformer operations under the conditions of variable loads and ambient air temperature [43][44][45][46]. The generally accepted relationship of thermal aging properties of insulation material is described by the Arrhenius reaction rate law [47]. The IEEE C57.91-1995 and IEC60076-Part.7 standards give an expression for the loss of life of mineral-oil-cooled power distribution transformers [48][49][50].…”