Interest has risen among utilities in using natural ester (NE) insulating oils in transformers as a substitute for conventional mineral oil. However, present understanding on aging behaviour of NE-paper composite insulation system and knowledge on application of existing condition monitoring tools for NE-based insulation are inadequate. This limits the cost effective and reliable field applicat...

In order to analyze the cracking and aging reason of the silicone rubber current transformer (CT) insulation bushing used for 8 years from a 500 kV alternating current substation, characteristics including Fourier transform infrared (FTIR) spectroscopy, mechanical properties analysis, hardness, and thermo gravimetric analysis have been carried out. The FTIR results indicated that the external s...

The European Standard on sleeping bag requirements (EN 13537:2002) describes a procedure to determine environmental temperature limits for safe usage of sleeping bags regarding their thermal insulation. However, there are several possible sources of error related to this procedure. The main aim of this work was to determine the influence of the various measuring parameters on the acuity of the ...

Abstract Buildings are more vulnerable to faults in design and construction, when exposed the extreme Greenlandic climate, however, most new materials designs have not been tested for Arctic conditions. Thus even minor errors can result failures like mould growth, discomfort, unnecessary heat loss. Rekognizing source of error be difficult, yet valuable. But how it identified whether lies or qua...

Insulation of thermal energy storage tanks is fundamental to reduce heat losses and achieve high efficiency. Although water were extensively studied in the literature, enhancement insulation quality often overlooked. The use vacuum has potential significantly without affecting dimension system. This paper shows for first time results tests done a 0.535 m3 tank residential building applications ...