Correlation Between Electrical and Mechanical Characteristics of Cables With Radiation-Modified Insulation on the Basis of a Halogen-Free Polymer Composition

Abstract

Introduction. The high saturation of the cable routes of nuclear and thermal stations, wind parks and solar power plants, onboard systems imposes stringent requirements in the field of fire safety of cables, which makes it necessary to use highly flame retardant halogen-free compositions. The introduction of flame retardants causes the mandatory modification (crosslinking) of the polymer matrix. Purpose. Determination of the optimal radiation dose based on the correlation between the mechanical and electrical characteristics of a radiation-modified halogen-free ethylene vinyl acetate copolymer with high-strength flame retardant insulation cables. Methodology. Mechanical and electrical tests of samples of radiation-modified cables with a copper conductor cross section of 1.0 mm 2 and a halogen-free filled insulation based on an EVA copolymer with a thickness of 0.7 mm have been performed. Results. A strong correlation is established between the elongation at break and the tensile strength, between the insulation resistance and the breakdown voltage. It is shown that at the optimum value of the irradiation coefficient in the range from 7 to 5, the insulation resistance increases more than twice, and the breakdown voltage at the direct current is increased by 1.3 times. The elongation at break is within the allowed values. References 12, figures 3.

Распределение Поглощенной Дозы По Периметру И Длине Полимерной Защитной Оболочки При Радиационном Облучении Судового Кабеля

“…The absorbed dose of radiation exposure, i. e., the technological dose of radiation, is represented as I/v ratio. The inverse of the technological dose of radiation is the coefficient of radiation K [8,9].…”

“…The protective polymer sheath of such cables should provide the appropriate mechanical characteristics (tensile strength and compression, cracking, flexibility), the ability to resist ignition (noncombustibility), non-propagation of fire; performance at elevated temperatures; non-release of hazardous and corrosive decomposition products when the cable burns; the minimum amount of smoke at ignition; resistance to aggressive media (moisture containing salt, oil and oil products). To provide a set of requirements for the polymer protective sheath of ship cables, radiationcrosslink cable halogen-free compositions are used [8,9,13].…”