Amorphous core transformers efficiency analysis in Turkish electrical distribution systems

Abstract

Abstract:Transformers are an indispensable element in the transmission and distribution of electricity. While they are highly efficient, the increasing global demand for electrical energy has prompted efforts to improve their performance.No-load power losses constitute the majority of total losses within electrical energy distribution, especially when looking at load ratio. In recent years, some studies have found that no-load power losses of amorphous core transformers are less than those of laminated steel core transformers by as much as 60% to 70%. For this paper, we have manufactured an amorphous distribution transformer prototype rated 33 kV and 1 MVA. By quantifying its design considerations, power losses, and the energy efficiency value, we studied the outcome of replacing laminated steel core transformers with this new type of machine.

CAD-based Design of Three Phase Transformer and Comprehensive Analysis for Wind Turbine Using Coupled Electromagnetic Field, Circuit and Thermal Model for 3.8 MVA Power

“…Core loss is called a no-load loss of electrical machine. Although it considered to be constant, it may slightly vary depend on voltage and frequency for different operational conditions as shown in Figure 9 [1]. It is clear from Figure 9 that core loss decrease in voltage decreases for different load conditions.…”

“…HV and LV are meaning as high voltage and low voltage, respectively. Transformer power can be written with respect to induced winding voltage, (𝜑m) maximum flux in (Wb), number of turns and frequency as in (1). Also, induced voltage per turn Et can be summarized in (2).…”

“…Wind power can be transformed to the electrical energy by using wind turbine, generator, transformers and gearbox mainly. After obtaining electrical energy by wind generator, to transfer this energy a power transformer with high efficiency and minimal energy losses [1] should be used in the level of distribution system [2] because it is not possible to store wind energy. So, this transformer used in wind energy generally has a step-up characteristic.…”

Evaluation of the Technical and Economic Feasibility of Mixed Grade Cores in Transformer Design According to EN50588-1

“…In [7], a 25 kVA, 11/0,425 kV transformer which was manufactured by combining traditional material types and amorphous materials was examined and core losses and cost were evaluated. Similarly, in [8,9], it was emphasized that amorphous materials were proved to have positive effects on transformer losses and efficiency, but additional structural components were required, especially with the increase in dimensions of the transformer. For this reason, it is seen that conventional core materials and core production methods maintain their advantages in transformers for high power levels.…”

Investigation of the Economical and Technical Design Feasibility of Si-Fe Graded Distribution Transformers according to EN50588-1

“…Today, amorphous materials provide important advantages for high-efficient transformer manufacturing. Using low-loss, high permeability amorphous materials, the no-load losses of transformers are reduced up to 60-70% and increased transformer efficiency up to 99.7%, compared to grain-oriented silicon steel transformers [6]- [9]. However, due to the saturated flux density and lamination factor values are lower than those of a grain-oriented core, necessity of additional structure to support core weight makes amorphous cores physically larger and vulnerable, especially for high power levels [10].…”