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Cable metal sheath grounding circulation calculation method based on multi-conductor transmission line theory

A multi-conductor transmission line, metal sheath technology, applied in the measurement of current/voltage, measurement of electrical variables, measurement devices, etc., can solve the problems of inconsistent grounded circulating circuit model parameters, and the parameter calculation formula is not rigorous, and achieves rigorous calculation process. , solve calculation problems, solve the effect of grounding circulation

Pending Publication Date: 2022-02-11
ZHEJIANG HUAYUN ELECTRIC POWER ENG DESIGN CONSULTATION CO LTD +1
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Problems solved by technology

However, the calculation formulas for the parameters of the ground circulation circuit model are not uniform in the existing literature, and the parameter calculation formulas given in some literatures are not rigorous.

Method used

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  • Cable metal sheath grounding circulation calculation method based on multi-conductor transmission line theory
  • Cable metal sheath grounding circulation calculation method based on multi-conductor transmission line theory
  • Cable metal sheath grounding circulation calculation method based on multi-conductor transmission line theory

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Embodiment

[0069] Embodiment: Calculation method for ground circulation of cable metal sheath based on multi-conductor transmission line theory, such as figure 1 Shown is a common structure of the current power single-core cable, including metal conductor 1, conductor shielding layer 2, XLPE insulating layer 3, insulating shielding layer 4, semi-conductive buffer water-blocking layer 5, metal sheath 6 and outer sheath 7. This calculation method is suitable for this type of cable: the calculation method includes the following steps:

[0070] S1, such as figure 2 As shown, with the earth as the reference conductor No. 0, the unit length equivalent circuit model of the transmission line consisting of a total of n+1 conductors of the cable core, the cable metal sheath and the earth return is established; the unit length equivalent circuit model will be The cable core and its corresponding cable sheath are modeled as two separate conductors, and the capacitance and conductance between the c...

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Abstract

The invention discloses a cable metal sheath grounding circulation calculation method based on a multi-conductor transmission line theory. The calculation method comprises the following steps of: S1, a unit length equivalent circuit model of a transmission line of a cable core, a cable metal sheath and a ground loop is built by taking the ground as a 0 # reference conductor, wherein the transmission line is composed of n + 1 conductors; S2, a multi-conductor transmission line equation is exported according to the unit length equivalent circuit model of the transmission line; S3, a general solution of the multi-conductor transmission line equation is exported; and S4, an undetermined constant in the general solution of the multi-conductor transmission line equation is calculated, a special solution of the multi-conductor transmission line equation is calculated, and an induced voltage and an induced current of the cable metal sheath are obtained. The method can be used for calculating the grounding loop current of the cable metal sheath, and has the advantages of simple calculation application and rigorous calculation process.

Description

technical field [0001] The invention relates to the technical field of AC high-voltage power cables, in particular to a method for calculating the grounding circulation of a cable metal sheath based on the multi-conductor transmission line theory. Background technique [0002] Uneven load current, uneven cable segments, different cable arrangements, and different cable phase distances will cause unbalanced induced voltage on the metal sheath, resulting in different sheaths and ground circulation between the sheath and the earth. When the grounding loop current of the metal sheath is too large, a huge ohmic loss will be generated, which will cause the temperature of the cable to rise, reduce the current carrying capacity and transmission efficiency of the cable, and shorten the service life of the cable. For this reason, the existing results generally use the equivalent circuit model to analyze and calculate the sheath circulation. However, the calculation formulas for the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00Y02E60/00
Inventor 周文俊覃喜刘燕平裘立峰吕鸣丁祥麻潇波杨仕友蔡润泽
Owner ZHEJIANG HUAYUN ELECTRIC POWER ENG DESIGN CONSULTATION CO LTD
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