A részleges kisülés eróziós hatást fejt ki a szigetelőszerkezetre, és a szigetelés károsodási mechanizmusa a következő szempontokkal rendelkezik:
①Charged particles (electrons, ions, etc.) impact the insulation, destroying its molecular structure, such as fiber fragmentation, so the insulation is damaged.
②Due to the impact of charged ions, the local temperature of the insulation will rise, which will easily cause overheating of the insulation, and carbonization will occur in severe cases.
③Ozone and nitrogen oxides generated by partial discharge will erode the insulation, and when there is moisture, nitric acid will be produced, which will erode the insulation more severely.
④During partial discharge, the oil is decomposed due to electrolysis and the Schottky radiation effect of the electrode, and there are some impurities in the oil, so it is easy to condense the sludge generated by polymerization at the paper layer (mostly in the insulation or other insulating oil wedges), the formation of sludge will increase the dielectric damage angle of the insulation, reduce the heat dissipation capacity, and even lead to the possibility of thermal breakdown. The continuous development of partial discharge will gradually expand the deterioration and damage of the insulation, which will eventually shorten the normal life of the insulation, reduce the short-term dielectric strength, and may even cause the entire insulation to break down.
The root cause of partial discharge of cables is the unqualified quality of cables. Such cables are extremely easy to cause accidents when used for a long time. To avoid such incidents, the most basic way is to choose national standard cables with national certification and quality assurance: in order to avoid Partial discharge occurred in the cable. Pearl River Cable actively introduced advanced wire and cable manufacturing technology, production equipment and testing equipment at home and abroad. It has always insisted on selecting high-quality raw materials at home and abroad, and implemented a strict quality control system to ensure the quality of the company's products from the source. , each wire and cable are in line with national standards and International Electrotechnical Commission standards.
