Method for determining current-carrying capacity of direct-current cable with metal sheath serving as return line

A technology of DC cables and metal sheaths, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of unsuitable DC cable ampacity, etc., and achieve the effect of ensuring long-term stable operation and reliable transmission

Pending Publication Date: 2022-01-04
CEEC JIANGSU ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal sheath of this patent application is not used as a return line, so it is not suitable for the determination of the ampacity of the DC cable whose sheath doubles as a return line

Method used

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  • Method for determining current-carrying capacity of direct-current cable with metal sheath serving as return line
  • Method for determining current-carrying capacity of direct-current cable with metal sheath serving as return line
  • Method for determining current-carrying capacity of direct-current cable with metal sheath serving as return line

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Embodiment

[0037] In this embodiment, a metal sheath doubles as a DC cable for the return line, such as figure 1 As shown, it includes: a conductor 1, an insulating inner shielding layer 2, an insulating layer 3, an insulating outer shielding layer 4, a water-blocking buffer strip 5, a metal sheath layer 6, and an outer sheathing layer 7.

[0038]In this embodiment, the conductor 1 is made of electrical copper, aluminum or alloy materials; the insulating inner shielding layer 2 is made of semi-conductive materials; the insulating layer 3 is made of cross-linked polyethylene or other insulating materials; The shielding layer 4 is made of semi-conductive materials; the metal sheath layer 6 is made of metal sheaths such as copper, aluminum or lead; the outer sheath layer 7 is made of high-density polyethylene. In this embodiment, the ampacity of the DC cable is controlled by the maximum long-term allowable temperature of the conductor 1 and the maximum allowable temperature difference betwe...

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Abstract

The invention discloses a method for determining the current-carrying capacity of a direct-current cable with a metal sheath serving as a return line, a heating source of the method for determining the current-carrying capacity comprises cable core conductor current-carrying heating and metal sheath return heating, and the metal sheath return current adopts the same current as the cable core conductor current-carrying current; the current-carrying capacity determination method comprises two steps of calculating the current-carrying capacity according to the maximum allowable temperature of a cable conductor and calculating the current-carrying capacity according to the allowable temperature difference of an insulating layer, and taking the smaller value of the two calculated currents as the maximum allowable current-carrying capacity of the cable. According to the method for determining the current-carrying capacity of the flexible direct-current cable, the influence of conductor current-carrying and metal sheath backflow heating is considered, the requirements of cable insulation and electric field distribution are met, long-term stable operation of the cable is guaranteed, and reliable transmission of electric energy is achieved.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a method for determining the ampacity of a direct current cable in which a metal sheath doubles as a return line. Background technique [0002] With the promotion of flexible DC power transmission, high-voltage DC cables have become an important means of island networking, clean energy transmission and power system interconnection. [0003] As a high-voltage DC cable, the steady-state ampacity is an important indicator of the transmission capacity of the cable. The accurate calculation of the steady-state ampacity of the cable is of great significance for the full utilization of the cable transmission capacity. Different from AC, the calculation of the steady-state ampacity of DC cables not only considers the maximum long-term allowable temperature of the core conductor, but also considers the electric field distribution of the insulating layer. A larger cable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 张瑞永吴锁平贾振宏赵新宇尹恒姚成赵晶赵纪倩马军苏玮郑擎天
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST
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