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Method for calculating current carrying capacity of submarine cable based on equivalent circuit model

An equivalent circuit model, a technology of submarine cables, applied in the measurement of electrical variables, current/voltage, and electricity, etc., can solve problems such as inability to apply submarine cables with return conductors, achieve simple and reasonable calculation methods, promote industry progress and innovative effect

Inactive Publication Date: 2015-05-20
CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP
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Problems solved by technology

[0018] The purpose of the present invention is to provide a method for calculating the ampacity of a submarine cable based on an equivalent circuit model in which the armor layer is made of steel, and the return conductor is added. This method solves the "rated continuous ampacity of cables" clause of IEC60287-1-1 1.4 Defects that cannot be applied to submarine cables with return conductors

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  • Method for calculating current carrying capacity of submarine cable based on equivalent circuit model
  • Method for calculating current carrying capacity of submarine cable based on equivalent circuit model
  • Method for calculating current carrying capacity of submarine cable based on equivalent circuit model

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but these embodiments should not be construed as limiting the present invention.

[0037] The equivalent circuit schematic diagram of the submarine cable with return conductor shown in the figure, including conductor 1, lead sheath 2, return conductor 3, armor layer 4, lead sheath 2, return conductor 3 and armor layer 4 currents Both are induced by the current in conductor 1.

[0038] The method for calculating the ampacity of a submarine cable based on an equivalent circuit model includes the following steps:

[0039] (1) armor layer 4 adopts steel material, in order to increase the intensity of submarine cable, just set up return conductor 3, return conductor 3 and armor layer 4 are connected in parallel, according to circuit structure, set up the equivalent circuit of return conductor cable;

[0040] (2) According to the equivalent ...

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Abstract

The invention discloses a method for calculating current carrying capacity of a submarine cable based on an equivalent circuit model. The method comprises the following steps of (1) according to the structure of a circuit, establishing a corresponding equivalent circuit; (2) according to the equivalent circuit in the step (1), listing an equation set; (3) solving the equation set in the step (2), so as to obtain a ratio lambda1 of metal sheath loss and conductor loss and a ratio lambda2 of armor loss and conductor loss; (4) substituting the obtained ratio lambda1 of metal sheath loss and conductor loss and the ratio lambda2 of armor loss and conductor loss in the step (3) into a formula, so as to obtain the current carrying capacity of a submarine backflow conductor cable. The method has the advantages that the structure is simple, convenient and reasonable, the defect that the existing cable current carrying capacity formula is only suitable for the cable with given structure, arrangement method and grounding type is overcome, the key problem of design of the existing mainstream submarine cable product is effectively solved, and the positive function is realized for promoting the progress and innovation of the submarine cable industry.

Description

technical field [0001] The invention relates to a method for calculating the ampacity of a submarine cable, in particular to a method for calculating the ampacity of a submarine cable based on an equivalent circuit model. Background technique [0002] Ampacity is one of the most important parameters of cable lines, and its accurate calculation is of great significance to the design and operation of power cables. The power design department selects cables and designs cable lines according to the ampacity, and the operation department controls the load of the cable lines according to the ampacity. [0003] At present, the internationally accepted AC submarine cable ampacity calculation is carried out according to IEC60287-1-1 "cable rated continuous ampacity" clause 1.4, the calculation formula is as follows: [0004] I = [ θ c ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/00
Inventor 李健赵远涛黄欲成郑伟吴高波吴庆华赵全江马凌
Owner CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP
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