Study On Insulating Oil Aging Characteristics Of High Voltage Cable Terminal

With the increase of cable terminal running time, the aging of insulating oil will gradually increase, resulting in greatly reduced the insulation of the terminal. After installation from the cable terminal, the terminal will be sealed, the internal insulating oil filled during operation can not be the appropriate testing, insulating oil after aging, it will easily lead to heat or insulation breakdown of cable termination, it is necessary to end isolation The aging characteristics of oil analysis, the aging of insulating oil terminal control law to ensure the safe operation of power systems.This paper describes the performance characteristics of the terminal insulating oil, insulating oil of the characteristic parameters of aging research status, and power equipment at home and abroad and fill insulating oil aging Detection Research. Then, several major oil terminal aging of insulation types, such as thermal aging, electrical aging and chemical aging in detail the mechanism of aging, and physical and chemical properties of insulating oil and electrical performance parameters are summarized and analyzed, the final sum of the terminal insulating oil aging parameters.In this paper, through building four cable loops, analog line conditions operating conditions, taken to improve the operating voltage of the means to accelerate the terminal insulating oil aging, through regular collection insulating oil sample track to test their aging parameters, thus analysis of high-voltage cable termination insulation oil the aging of the law. The results show that:the two brands of silicone oil and polyisobutylene oil sample a variety of old and new parameters of the aging characteristics of the running time with the cable termination increased constantly changing, specifically in the water content increases, characteristic gas CH4, C2H6, CO, CO2 increases, the dielectric loss tangent increases; sealed cable terminals to run some time later, in the role of thermal and electric chemical reaction, precipitation of trace moisture, can lead to degree of aging of insulating oil;After a long run, the terminal water molecules and the machinery inside the magazine down precipitation, concentrated in the lower part of the terminal, resulting in some loss of insulating oil power increases, the lower temperature caused by the terminal; insulating oil of different degrees of aging on the operation of the cable terminal there will be some impact, but the experiment has not yet developed to the analysis of very serious level of need in the future operation of the terminal head of the cable track and analyze insulating oil and the need for terminal partial discharge cable testing, the aging master level trends. Finally, further analysis of the causes of aging causes the terminal insulating oil, and according to the actual situation of the four end-insulating oil to prevent aging of the measures:adding anti-oxidants to improve the sealing performance of the terminal design to improve equipment in strict accordance with the construction process to install terminals in operation process, we need regular inspection and maintenance of terminal equipment.