Ceramic ethylene propylene insulating medium-voltage fireproof cable and processing technology thereof

A technology of ethylene-propylene insulated and fire-resistant cables, which is applied in the direction of insulated cables, power cables, insulated conductors, etc., and can solve the problems of ceramic sintered layer not producing heat insulation function, manufacturing cost, large outer diameter and weight, and complex structure of medium-voltage fire-resistant cables and other issues, to achieve good fire resistance, reduce outer diameter and weight, and reduce the cost of cables

Inactive Publication Date: 2018-08-03
SICHUAN MINGXING CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing medium-voltage fire-resistant cables have the following disadvantages: when the external temperature is high or encounters flames, the ceramic sintered layer formed by the ceramic silicone rubber refractory layer cannot produce good heat insulation function, and the core insulation layer in the cable structure uses The semi-conductive shielding material, cross-linked polyethylene or ethylene-propylene rubber insulation, the normal working temperature is only 90 ℃, in case of high temperature, the insulation layer will soften, and it is easy to be broken down in the energized state. Therefore, this kind of fire-resistant cable cannot Sustained higher temperature, longer fire resistance time, and poor fire resistance
Moreover, the existing medium-voltage fire-resistant cable has a complex structure, and the manufacturing cost, outer diameter and weight are relatively large

Method used

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  • Ceramic ethylene propylene insulating medium-voltage fireproof cable and processing technology thereof
  • Ceramic ethylene propylene insulating medium-voltage fireproof cable and processing technology thereof
  • Ceramic ethylene propylene insulating medium-voltage fireproof cable and processing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a ceramic ethylene-propylene insulated medium-voltage fire-resistant cable with a rated voltage of 6kV to 35kV provided by the present invention includes a cable core 1, an inner sheath 2 extruded outside the cable core, and an inner sheath wrapped outside the inner sheath. The armor layer 3 and the outer sheath 4 extruded outside the armor layer, wherein the cable core 1 is cabled by three insulated wire cores 5 and a center filling 6, and the insulated wire cores 5 are sequentially composed of It consists of a conductor 7, a conductor shielding layer 8, an insulating layer 9, an insulating shielding layer 10, and a metal shielding layer 11 wrapped outside the insulating shielding layer.

[0038] The metal shield is braided with metal wires, the inner sheath is made of thermosetting cross-linked polyolefin, the armor layer is made of tinned copper wire braided armor, and the outer sheath is made of thermosetting cross-linked polyolefin.

[0...

Embodiment 2

[0056] The implementation is roughly the same as in Example 1, the difference being:

[0057] The material weight components of the ceramic conductor shield or ceramic insulation shield based on ethylene propylene are:

[0058]

[0059] The material weight components of the ceramicized ethylene-propylene insulation based on ethylene-propylene are:

[0060]

[0061]

[0062] The ethylene-propylene rubber is KEP-510, the third monomer is ethylidene norbornene, the ethylene content is 70%, and the Mooney viscosity (ML1+4, 125° C.) is 25.

[0063] The conductive carbon black is YD-280C and HG-1P conductive carbon black, the mixing ratio of the two is 5:1, which can achieve better conductor performance and processing performance.

Embodiment 3

[0065] The implementation is roughly the same as in Example 1, the difference being:

[0066] The material weight components of the ceramic conductor shield or ceramic insulation shield based on ethylene propylene are:

[0067]

[0068]

[0069] The material weight components of the ceramicized ethylene-propylene insulation based on ethylene-propylene are:

[0070]

[0071] The ethylene-propylene rubber is KEP-510, the third monomer is ethylidene norbornene, the ethylene content is 80%, and the Mooney viscosity (ML1+4, 125° C.) is 28.

[0072] The conductive carbon black is YD-280C and HG-1P conductive carbon black, the mixing ratio of the two is 6:1, which can achieve better conductor performance and processing performance.

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Abstract

The invention provides a ceramic ethylene propylene insulating medium-voltage fireproof cable. The cable comprises a cable core, an inner sheath, an armored layer and an outer sheath; the cable core consists of three insulating wire cores and a central filling part; each insulating wire core consists of a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer and a metal shielding layer for coating the insulating shielding layer from inside to outside in sequence; the medium voltage refers to a rated voltage of 6-35kV; each conductor shielding layer is a ceramic semi-conductive conductor shielding layer which takes ethylene propylene as a base material; each insulating layer is a ceramic ethylene propylene insulating layer which takes ethylene propyleneas a base material; each insulating shielding layer is a ceramic semi-conductive insulating shielding layer which takes ethylene propylene as a base material; and the ceramic semi-conductive conductorshielding layer and the ceramic semi-conductive insulating shielding layer have the consistent vulcanization systems with the ceramic ethylene propylene insulating layer. The medium-voltage fireproofcable provided by the invention still can be maintained to be high in stability, ceramic effect and fireproof property at high temperature or in flame, so that fire and other sudden conditions can bewell handled.

Description

technical field [0001] The invention belongs to the field of power cable materials, and in particular relates to a ceramic ethylene-propylene insulated medium-voltage fire-resistant cable, which is suitable for power transmission occasions requiring fire resistance, such as ships, offshore oil platforms, port machinery, power transmission, and high-rise buildings. etc., the present invention also relates to the processing technology of the ceramized ethylene-propylene insulated medium-voltage refractory cable. Background technique [0002] The structure of the medium-voltage fire-resistant cable is determined by its electrical parameters operating at high voltage. The insulated core must be composed of conductors, conductor shields, XLPE or ethylene-propylene rubber insulation, and insulation shields. Therefore, low-voltage fire-resistant cables use The mica tape and mineral insulation cannot be applied to medium voltage cables. At present, the common medium-voltage fire-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/02H01B7/04H01B7/17H01B7/22H01B7/29H01B9/02H01B13/00C08L23/16C08K13/02C08K3/04C08K3/34C08K3/26
CPCH01B7/29C08K3/04C08K3/041C08K3/26C08K3/346C08K13/02C08K2003/265H01B7/0216H01B7/0275H01B7/04H01B7/17H01B7/228H01B7/292H01B9/021H01B9/024H01B13/00C08L23/16
Inventor 李勇军盛业武陈光高沈智飞毛开裕靳荐宇
Owner SICHUAN MINGXING CABLE
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