Flexible mineral insulated cable and production method thereof

Abstract

The invention discloses a flexible mineral insulated cable and a production method thereof. The flexible mineral insulated cable comprises cable core conductors, insulated layers and a sheath. An inner calcined mica insulated tape wraps every cable core conductor tightly, an outer calcined mica insulated tape wraps every inner calcined mica insulated tape, and the insulated layer wraps every outer calcined mica insulated tape by extruding so as to form one insulated wire. A glass fiber filling rope is arranged in a gap among the insulated wires which are stranded into a cable body, mineral oxygen-insulated fireproof filling mud is extruded outside the stranded insulated wires, a fire-resistant layer is arranged outside the mineral oxygen-insulated fireproof filling mud, and the sheath is extruded outside the fire-resistant layer. The flexible mineral insulated cable has the advantages of high flexibility, excellent insulating and fire-resisting performance, simple production technology, low cost and long service life.

Description

technical field [0001] The invention relates to a power cable, in particular to a mineral insulated cable and a preparation method thereof. Background technique [0002] Mineral Insulated Cable (Mineral Insulated Cable) referred to as MI cable. At present, according to the structural characteristics, it can be divided into two types: rigid and flexible. Rigid mineral insulated cables were conceived by Swiss engineer Arnold Francois Borel at the end of the 19th century, and were patented in 1896. They developed rapidly after they were put into production in France and England in 1934-1936. my country also developed it in the 1960s and began to use it in the military field. It began industrial production in the mid-1980s and was gradually fully accepted by the construction field. The invention of flexible mineral insulated fireproof cables was born in the Swiss Stutt Cable Company in the 1970s. Flexible mineral insulated cables are composed of copper strands, mineral compou...

AI Technical Summary

Problems solved by technology

The fire-resistant mineral insulated cables currently used are usually composed of a copper core nickel-coated conductor, an external insulating layer, and a sheath, which lack flexibility. The surface of the mineral filling extruded around the cable is not smooth and round enough, and the mineral filling mud is prone to cracks when it is dried after being extruded, which leads to the reduction of insulation and fire resistance performance.

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