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Preventive diagnosis and maintenance of transformers have become more and more popular in recent times in order to improve the reliability of electric power systems. Dielectric testing techniques such as frequency domain spectroscopy (FDS) are being investigated as potential tools for condition assessment of transformer insulation. The FDS test has been affected by the factors, such as, the geometric, temperature, moisture content of insulation system. In this paper, those effect factors will be analyzed, according the field test data and laboratory model data.

The waste heat resource of iron and steel industry was the research object. The economical and technical of direct heating, sensible heat storage and latent heat thermal storage were compared. The result shows that using phase change materials (PCM) as storage materials, energy storage density is higher, cost and exergy loss is lower and the discharge of air pollutants can be reduced, which is compliance with the requirements of conservation and reduction of pollutant emissions and has a broad application prospect.