Power cable mechanical and physical performance testing

(1) Mechanical performance test of insulation and sheath
l This test is used to measure the tensile strength and elongation at break of the electrical relay rubber or plastic insulation and sheath. The sample can be unaged, or it can be air-heated or otherwise aged.
l Tensile testing machine: 1 lever and pendulum testing machine
2Electronic tensile testing machine
(2) Thermal aging test of air box
l Rubber and plastic materials are the same as other polymer materials. During use and processing, the performance of the material slowly deteriorates until it loses its working performance. The process is called presbyopia.
l The aging factors are: the presence of oxygen, sunlight radiation, oil solvent corrosion, etc. commonly used oven methods
(3) Cross-linking degree test of cross-linked polyethylene
l The degree of cross-linking of cross-linked polyethylene directly affects the quality of cross-linking. The degree of cross-linking of cross-linked polyethylene should not be less than 80%, and the determination of the degree of cross-linking is now commonly used in heat extension methods. This method is to determine the degree of cross-linking by measuring the elongation and permanent deformation of the cross-linked polyethylene pattern under heat and load.

l Oxygen index test
Test concept and purpose: The so-called oxygen index is the minimum oxygen concentration required to maintain a stable combustion of the sample in an oxygen-nitrogen mixture under specified conditions, expressed as a percentage of the volume of oxygen.
The higher the oxygen index, the more difficult it is to burn the material, and the volume of oxygen in the air accounts for about 21%.
(4) Special performance testing
After the cable is installed, perform a test, which should include all joints and terminals.
It needs to be tested for direct current voltage (DC) and alternating current voltage (AC)