Cable for coal mine frequency conversion device with voltage of 1.9/3.3kv and below

Abstract

Provided is a cable for a coal mine frequency conversion device with the voltage of 1.9 / 3.3kv and below. The cable for the coal mine frequency conversion device with the voltage of 1.9 / 3.3kv and below comprises a cable core and an outer sheath, wherein the cable core comprises a plurality of power line cores and a plurality of control line cores with ground wires, the power line cores and the control line cores with the ground wires are twisted to form the cable core, a lining layer, a braided copper wire shielding layer, an aluminum plastic composite band shielding layer and the outer sheath are arranged outside the cable core in sequence from inside to outside, each power line core comprises a power line core conductor, an insulting layer A which wraps the power line core conductor in a pressing mode, and an insulating shielding layer which wraps the insulating layer A, and each control line core with the ground wire comprises a control line core conductor, an insulating layer B which wraps the control line core conductor in a pressing mode, a ground wire core which is sparsely wound on the insulating layer B, and a semi-conducting layer which wraps the ground wire core. The cable for the coal mine frequency conversion device with the voltage of 1.9 / 3.3kv and below has the advantages that the shielding performance is good, an ideal shielding factor is no larger than 0.8, and the defects that an existing variable-frequency cable is poor in shielding performance, and is without the control line cores are overcome.

Description

technical field [0001] The invention relates to a cable, in particular to a rubber-sheathed flexible cable for frequency conversion devices in coal mines with a rated voltage of 1.9 / 3.3kV and below. Background technique [0002] Rubber-sheathed flexible cables for frequency conversion devices in coal mines require that the cables have characteristics such as oil resistance, wear resistance, and flame retardancy, and have good shielding performance when subjected to mechanical stress such as frequent bending and stretching. [0003] The Chinese patent with the publication number of 102262937A discloses "a kind of flexible cable with rubber sheath for frequency conversion device in coal mine". Copper braided shielding and an outer sheath are provided outside the cable core. [0004] The Chinese patent with the publication number 202183246U discloses "a rubber-sheathed flexible cable for frequency conversion devices used in coal mines". The main structure includes: fillers, th...

AI Technical Summary

Problems solved by technology

[0008] The cable is mainly used for power supply or connection to the control system of the frequency conversion device in coal mines. It has strong shielding performance, and the ideal shielding coefficient is not more than 0.8. It also ensures the structural stability and bending resistance of the cable while adding the control core. , which solves the shortcomings of the existing frequency conversion cables such as poor shielding performance and no control core

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