Hao Wu

TL;DR: An optical gas detection system based on TDLAS technology is proposed to detect acetylene dissolved in transformer oil that responds quickly to changes of gas concentration and is easily to maintenance while has no electromagnetic interference, cross-sensitivity, or carrier gas.

TL;DR: Based on tunable diode laser absorption spectroscopy (TDLAS) technique, a novel optical method is proposed to detect dissolved methane in transformer oil as discussed by the authors, which shows tremendous advantages, such as immediate response to concentration changes, no cross interference, no carrier gases, which is proved to be a promising maintain-free technique instead of conventional DGA equipment.

TL;DR: In this paper, the authors measured the dynamic process and distribution of electric filed in oil-pressboard insulation under the combined field so as to provide reference for insulation design, and the results indicated that although the RC model is recognized as effective simulation method for the insulation design of conventional transformers, it shows its limitations and should be enriched and adjusted according to the electric field distribution under AC-DC combined voltage and taking into full consideration of the accumulation of interface charges.

TL;DR: In this paper, an electric field analysis model based on interface charge, named Interface Charge Polarity Effect (ICPE) Model, is proposed in order to analyze the effect of interface charge on electric field.

TL;DR: In this article, an investigation of the underlying mechanism behind the interface charge barrier between oil and oil immersed paper is presented, and the results show that the amount of interface charge changes with the type of oils and papers, and is much larger than the Maxwell-Wagner-Sillars (MWS) polarization charge.