Experimental study on the transition process from partial discharge to arc discharge of oil–paper insulation based on fibre‐optic sensors

Abstract

Arc discharge in the power transformer can bring enormous economic losses and safety risks. The transformer protection system for arc discharge faults is still not ideal. The physical characteristics of the whole process from partial discharge defects transition to arc faults are not fully recognized, mainly because it is difficult to establish and sense the relevant characteristic parameters. This paper built a research platform for studying the transition process from partial discharge to early arc discharge based on fibre‐optic ultrasonic, temperature, pressure sensors with traditional electrical voltage and current sensors. Five discharge models are designed and the changing pattern of multiple parameters in the transition process of different models is studied. The experiment results show that the amplitude and frequency of acoustic waves drop significantly after the arc breakdown. Ultrasonic and high‐frequency current sensing in the early warning of arc fault each has its own limitations. The pressure caused by the arc is not only related to the arc energy but also related to the discharge types. The overall oil temperature change after the early arc discharge is small and hard to detect. This work highlights the promise of using fibre‐optic sensors for physical process research within a harsh electromagnetic environment.

Ultra‐high frequency sensors positioning on the power transformer to mitigate the negative effects on the partial discharge localization accuracy

“…This process continues until a significant part of the insulation structure is destroyed and can no longer tolerate the intensity of the electric field. At this stage, an arc is drawn between the two electrodes that this insulation is between them, and the equipment is destroyed [1,2].…”

Characterization of Temperature and Strain Changes in Lithium-Ion Batteries Based on a Hinged Differential Lever Sensitization Fiber Bragg Grating Strain–Temperature Simultaneous-Measurement Sensor

“…The optical fiber sensor has the characteristics of anti-electromagnetic interference, electrical insulation, corrosion resistance, etc., and is suitable for the quantitative detection of characteristic parameters of Li-ion batteries [ 23 ]. The sensor based on fiber Bragg grating (FBG) adopts wavelength modulation, is easy to use, and is not affected by intensity noise [ 24 , 25 , 26 ]. Several methods have been proposed for cell temperature and strain detection based on the fiber optic sensing technology [ 27 , 28 ].…”

A study of dual-cantilever beam FBG sensing detection of transformer winding vibration

“…Compared with traditional winding vibration sensors, optical fiber sensors have the characteristics of anti-electromagnetic interference and corrosion resistance, which are more suitable for application in transformer winding vibration detection. [15][16][17] Therefore, many researchers have also developed a variety of optical fiber sensors applied to transformer windings. Araújo et al used 3.2 mm diameter spiral cut PTFE winding tube wrapped fiber optics, made of nearly 3 m long casing, its flange with the wall of the transformer ARTICLE pubs.aip.org/aip/adv tight cross alignment, the end of the optical fiber made of multipoint Fiber Bragg Grating (FBG) temperature probe to achieve the temperature of the transformer and internal vibration at the same time to detect, and get a more obvious effect, but the effect of vibration detection is susceptible to the influence of temperature.…”