Parameters of electrical insulating materials. Scheme, description

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electrical insulating materials. Parameters of electrical insulating materials. Encyclopedia of radio electronics and electrical engineering

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Paper capacitor KON-1 and KON-2 are produced in thicknesses from 4 to 30 microns, and have a breakdown voltage of 300-600 V.

cardboard electrical insulating grades EV and EVT are produced in rolls of OD thickness; 0,15; 0,2; 0,25; 0,3; 0,35; 0,4; 0,5 mm and in sheets with a thickness of 1; 1,25; 1,5; 1,75; 2; 2,5; 3 mm (the latter only brand EV).

Electrical strength rolled electrical insulating cardboard in a flat state is 10-13 kV/mm, and along the inflection line it decreases to 8-10 kV/mm.

Rubber, plastic, impregnated paper and other types of insulation are used for cables and wires. Insulating materials are designated letter I with indices corresponding to a specific material.

Rubber insulation It is made on the basis of natural or synthetic (butadiene, butyl, etc.) rubbers. The following types of insulating rubbers established by GOST are used: RTI-0, RTI-1, RTI-2, RNI, classified depending on the rubber content. Rubber aging testing is carried out for 4 days at a temperature of + 120 °C. Based on rubber and organosilicon alcohols, organosilicon rubber is produced, which has higher electrical properties. For example, it is long-term resistant to temperatures ranging from -60 °C to +200 °C.

insulation from PVC plasticizer (PVCP) are mixtures of polyvinyl chloride with plasticizers, stabilizers and other additives that give PVCP elasticity, facilitate its processing, but worsen its electrical insulating properties, heat resistance, and chemical resistance. PVCPs are still produced in accordance with GOST 5960-72.

К PVC for general use brands include: I40, I45, I50, I60. PVCP low flammability grades NGP 40-32 and NGP 30-32 are produced in accordance with TU 2246-425-05761784-98, PVCP brand IM 40-8, IOM 40-8 - in accordance with TU 6-02-51-90, PVCP of increased heat and oil resistance grade IT-105V - in accordance with TU 10.K 71-275-98, etc.

PVCP grades I40-13, I40-13A, I40-14 used for insulating wires and cables in the temperature range from -40 °C to +70 °C. For the same purpose, grades I50-13, I50-14 are used in the temperature range from -50 °C to +70 °C, and I60-12 - in the temperature range from -60 °C to +70 °C; All these brands of insulation are recommended for the Far North. For insulation and sheathing of wires and cables, grade I45-12 is used in the temperature range from -45 °C to +70 °C.

Author: Koryakin-Chernyak S.L.

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