Cheng-rong Li

TL;DR: In this article, it was found that electron shallow trap density and charge decay rate are greatly increased in nanofluids, i.e., fast electrons may be converted to slow electrons by electron trapping and de-trapping in shallow traps of nanoflids, resulting in improved breakdown performance compared to that of pure transformer oils.

TL;DR: In this paper, a method for partial discharge (PD) source location in power transformers based on detecting electromagnetic (EM) radiation emitted from PD is presented. But the problem of partial discharge location by EM waves is the difficulty in getting the accurate time arrivals of the signals from the source to multiple sensors.

TL;DR: In this article, the heat transfer surface charge accumulation model of operating DC-GIL was developed, including the nonlinear relationship between volume current in gas and electric field, and the space charge was also considered in the model.

TL;DR: In this article, a fiber Bragg grating (FBG) sensor was proposed for detecting hydrogen in transformer oil, and polyimide was added in the adhesive layer to solve the problem that the palladium layer peels off from the FBG when exposed to a high concentration of hydrogen.

TL;DR: In this article, a distributed power transformer partial discharge detection system based on phase-shifted fiber Bragg gratings (PS-FBG) is proposed, which can be installed inside the power transformer, which takes the advantage of the optical fiber status as an insulator.