Application of self-regulating electric heating cable on high speed rail Application of self-regulating electric heating cable on high speed rail

Published on:

2023-01-12 13:07

Self-regulating heating cable is a ribbon electric heating element that is extruded from a conductor, heating material, and insulation layer and has a metallic or non-metallic sheath that can itself limit the maximum heating temperature. The heating cable is generally used to cover the surface of an object in a flat or wound way. The installation method is flexible and can be determined by the shape of the object being heated. It is widely used in antifreeze, process maintenance or heating. Pipelines, boxes, silo equipment and other systems.

In railway vehicles, equipment such as water and drainage piping, sewer piping, vacuum piping, and boxes under vehicles use heating cables to heat antifreeze. The heating element of the heating cable is a material with a positive temperature coefficient containing conductive particles, the material is uniformly extruded between two parallel metal tires, and the conductive particles are connected across the two tires to form several parallel circuits. Valve body, the heating element can automatically adjust the output power according to the temperature of the heated system, adjust the heat generated, so as to achieve the purpose of automatic temperature limitation, to ensure that the working system is always normal. Set the optimal working temperature zone.

(1) Copper core tire: 19 × 0.32, 7 × 0.5

(2) Heating core belt: Fluorine PTC

(3) Insulation layer: Fluorinated polyolefin, perfluorinated material.

(4) Shielding layer: Tinned copper wire braid or another metal wire braid with a coating density of ≥ 80%.

(5) Shell Layer: Fluorinated Polyolefin, Perfluorinated Material.

Electric heating parameters of self-control temperature

(1) Standard color: black/blue

(2) Temperature range: The maximum operating temperature is 65 ± 5 °C and the maximum temperature to be sustained is 90 °C.

(3) Design temperature: Polyolefin minimum-20 °C, Fluorine material minimum-60 °C

(4) Start current: ≤ 0.5 A/m

(5) Thermal stability: After the electric heating belt has passed the thermal performance test, its power should be maintained at 90% of the original value.

(6) Bending radius: 25.4mm at-20 °C, 35mm at-60 °C

(7) Insulation resistance: The insulation resistance between the electric heating conductor and the metal shielding layer shall be at least 50 Mhm.

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