Structure and performance of cable insulation material * paper of Zhengzhou YJV Cable Co., Ltd

  　　  Structure and properties of cable insulation material * paper of Zhengzhou yicable Co
, Ltd
There are generally two types of cable cores, single core or multi core
Single core is only one conductor, and multi core is formed by twisting multiple conductors
There are many gaps between the core and the insulating layer
In production, in order to fill these gaps, impregnation agent is usually used
In addition, there are often large gaps between the insulating layer and the metal sheath
Don't underestimate these gaps, They do great harm to the cable and will reduce the dissociation and breakdown strength of the cable
Therefore, it is a problem to fill these gaps well in the production process Therefore, power cables of 3
6/6kv and above are generally provided with * layers on the inner and outer sides of the insulating layer to keep the gap * outside the electric field
And in order to better solve this gap problem, insulating * paper appeared It pastes aluminum foil with a thickness of about 0
014mm on one side of the cable paper
Due to the poor impregnation of this metallized paper, it is used in every 100cm? 500 small holes are drilled evenly in the area of to improve its impregnation performance At present, the most popular in the market is aluminum foil * insulating paper
The research principle of aluminum foil * insulating paper is that the metal * body shields the far-field of the radiation interference source through the reflection and absorption of electromagnetic wave, and the electric field and magnetic field components generated by the field source The products produced by some manufacturers use ordinary cable paper to make * paper by manual pasting
The products have many defects, such as weak bonding of paper base, unstable size, wrinkling and bubbles
The aluminum foil insulation paper is firmly bonded, stable in size, and will not wrinkle or bubble
Therefore, aluminum foil insulation paper is also used in some transformer products After the * layer is adopted for the cable, the improvement of product performance is also quite obvious
After the * paper is used, the electric field intensity on the surface of the wire core decreases by about 3%, which can increase the power frequency breakdown voltage of the cable by 30% ~ 40%
It can be said that it has greatly improved the product performance and safety