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Novel cable and method for relieving ablation of cable buffer layer

A buffer layer and conductive buffer technology, applied in the direction of insulated cables, cable/conductor manufacturing, cables, etc., to achieve the effects of stable physical and chemical properties, good electrical conductivity, and reduced insulation performance

Pending Publication Date: 2022-08-09
XIAMEN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID FUJIAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can effectively solve the problem of buffer layer ablation and prolong the service life of high-voltage XLPE cables

Method used

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  • Novel cable and method for relieving ablation of cable buffer layer
  • Novel cable and method for relieving ablation of cable buffer layer
  • Novel cable and method for relieving ablation of cable buffer layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, a conductive solution is filled between the aluminum sheath 1 and the insulating shielding layer 2 of the XLPE cable with a voltage level of 220kV. A semi-conductive buffer strip 4 is also included, and the semi-conductive buffer strip 3 is placed on the insulating shielding layer 2 .

[0035] A conductive liquid is injected into the XLPE cable with a voltage level of 220kV, and the electrical parameters of the conductive liquid are shown in Table 1:

[0036] Table 1 Electrical parameters of conductive liquid

[0037] Relative permittivity 100 Thermal conductivity / W·(m·K) -1

Embodiment 2

[0039] A conductive liquid is injected into the XLPE cable with a voltage level of 220kV, and the electrical parameters of the conductive liquid are shown in Table 2:

[0040] Table 2 Electrical parameters of conductive liquid

[0041] Relative permittivity 100 Thermal conductivity / W·(m·K) -1

0.29 Constant pressure heat capacity J / (kg·K) 2120 Conductivity S / m 10 -3 -10 -12

pH 7.0 toxicity toxic free and safe

[0042] Figure 8 In Example 2, the electrical conductivity was decreased by 10 times from 0.001S / m to 1e -12 S / m (conductivity in turn: 1×10 -3 S / m, 1×10 -4 S / m, 1×10 -5 S / m, 1×10 -6 S / m, 1×10 -7 S / m, 1×10 -8 S / m, 1×10 -9 S / m, 1×10 -10 S / m, 1×10 -11 S / m), the current density distribution diagram when white powder appears in the aluminum sheath and buffer layer. It can be seen from the figure that when the conductivity is 0.001S / m, the current density is the most uniform, 1×10 -11 most uneven time. For furth...

Embodiment 3

[0048] A conductive liquid is injected into the XLPE cable with a voltage level of 220kV, and the electrical parameters of the conductive liquid are shown in Table 3:

[0049] Table 3 Electrical parameters of conductive liquid

[0050] Relative permittivity 1-5000 Thermal conductivity / W·(m·K) -1

0.29 Constant pressure heat capacity J / (kg·K) 2120 Conductivity S / m 10 -6

pH 7.0 toxicity toxic free and safe

[0051] Figure 12 For example 3, the relative dielectric constant is 1-5000 (the values ​​are 1, 10, 50, 100, 200, 1000, 3000, 4000, 5000), and the current density distribution diagram when white powder appears in the aluminum sheath and buffer layer , Figure 13 for different relative permittivity Figure 12 It can be seen from the figure that when the relative permittivity increases, the current density on the main insulation increases, but the maximum current density decreases. Depend on Figure 12 and Figure 13 I...

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Abstract

The invention relates to a novel cable and a method for relieving ablation of a cable buffer layer. According to the method, conductive liquid is filled between the aluminum sheath and the insulation shielding layer. The problem of ablation of the buffer layer can be effectively solved, and the service life of the high-voltage crosslinked polyethylene cable is prolonged.

Description

technical field [0001] The invention relates to a novel cable and a method for alleviating the ablation of the cable buffer layer, belonging to the technical field of cables. Background technique [0002] High-voltage cables have been widely used in my country's power grids because of their high reliability and small footprint. Among them, high-voltage cross-linked polyethylene cables have become the best choice for cable construction in my country due to their excellent mechanical properties, convenient installation and maintenance, and excellent insulation properties. According to the survey, most of the high-voltage XLPE cables being put into operation in our country adopt a corrugated aluminum sheath structure, and a buffer layer is added between the aluminum sheath and the insulating shielding layer. The buffer layer can provide heat insulation, water blocking and other functions, so that the aluminum sheath and the insulating shielding layer maintain good electrical c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/22H01B13/00H01B7/29H01B7/00
CPCH01B13/221H01B13/00H01B7/0027H01B7/292Y02A30/14
Inventor 严有祥朱婷林宇辰林少山罗晨蔡俊宇曾麟陈鸿孙志鸿罗汪彬徐宏斌
Owner XIAMEN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID FUJIAN ELECTRIC POWER
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