The invention discloses a production method for conductors for fire-resistant middle-
high voltage cables. The method includes steps of
material selection,
wire drawing, annealing, conductor hinging, co-
extrusion and
coating of an inner shielding layer, an
insulation layer and an outer shielding layer, setting of a
metal shielding layer,
extrusion of a phase-separation fire-resistant
insulation layer, winding of a first wrapping tape layer, cabling twisting and winding of cabling belting layer, winding of a
metal armored layer, winding of a second wrapping tape layer and an outer sheath layer
extrusion, wherein during the extrusion of the phase-separation fire-resistant
insulation layer,
ceramic silicon rubber materials are extruded on the
metal shielding layer through a
silicon rubber extruder, and the extruding thickness is 2.0mm-4.0mm. According to the method, the phase-separation fire-resistant insulation layer is arranged, the
silicon rubber extruder is used for extrusion of the
ceramic silicon rubber materials, therefore the materials are provided with good thermal insulating effect,
ceramic bodies are fired by flames at a high temperature and provided with a certain
mechanical strength and good electrical insulation performance due to the fact that the major material is inorganic silicon, so that the fire-resistant performance of the cables can be improved.