Effect Of Thermal Aging On The Properties Of Water-tree-retardant XLPE Cable Insulation

Crosslinked polyethylene(XLPE)is widely used in high voltage cables because of its excellent electrical performance and stable physical and chemical properties.With long-term running of the cables,degradation of insulating materials will happen under the action of long time thermal stress,which causes the irreversible change of chemical structure and morphology.Aging damage weakens the electrical properties of the cable and lead to insulation failure gradually.And thus,irreparable damage to the society and people is caused.So,against the water tree described.properties heat aging properties of the cable insulation materials,is currently one of the hot topics of concern The subject not only has a certain scientific research significance,also can bring good economic benefits and social benefits,is helpful to promote the all-round development of the cable industry in our country.Is introduced in this paper,by the high voltage cable insulation material as the research object,selecting 130 ℃,140 ℃,150 ℃ temperature dow water resistant trees,water tree Wan Ma,accelerate the thermal aging experiments,through different aging time describes the performance of the samples infrared spectrum,the gel content,communication breakdown strength,thermal conductivity,space charge,stretch,stretch,etc.The description of the thermal aging test.For the chemical and physical properties of the water tree insulation materials,electrical and mechanical properties.After the research results show that under the effect of heat for a long time,the thermal cracking reaction and then crosslinking reaction exists in described.properties of insulating material at the same time,in the early part of the thermal aging,molecules and crosslinking reaction plays a leading role,described.properties insulation characteristics of physical and chemical properties,breakdown,conductance,space charge distribution,mechanical properties,etc are not deterioration;With the increase of aging time,thermal cracking reaction plays a leading role,thermal aging on the mechanical properties,excellent electrical performance,physical and chemical performance has obvious damage.