A Calculation Method for Sheath Induced Voltage and Circulating Current of Cable System Laying with Bridge
A technology for laying cables and cable systems, applied in the field of sheath induced voltage and circulating current calculation, to achieve the effect of overcoming high order, fast and accurate calculation, and overcoming complex calculation process
Inactive Publication Date: 2022-04-29
ZHEJIANG UNIV +1
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Problems solved by technology
[0005] The purpose of the present invention is to solve the steady-state calculation problem of the bridge-laying cable system and provide a method for calculating the induced voltage and circulating current distribution of the sheath
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[0072] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0073] Such as figure 1 As shown, a method for calculating the sheath induced voltage and circulating current of the cable system laid with the bridge includes the following steps:
[0074] (1) According to the geometric structure and basic material parameters of the bridge-laying cable system, considering the influence of overhead laying, determine the unit length series impedance matrix and unit length parallel admittance matrix of the bridge-laying cable system:
[0075] The studied bridge-mounted cable system consists of a three-phase power cable and a return bare conductor, and its structure is as follows: figure 2 shown. Firstly, determine the series impedance matrix per unit length of the bridge-mounted cable system. Considering the influence of...
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The invention discloses a method for calculating sheath induced voltage and circulating current of a bridge-laying cable system. According to the geometric structure, basic material parameters and overhead transmission characteristics of the bridge-laying cable system, the method derives the unit length of the bridge-laying cable system The impedance matrix and the unit length parallel admittance matrix are connected in series to determine the unit length node admittance matrix; according to the node constraints, the cascading formulas of different order matrices and same order matrices are derived, and the complete node admittance matrix and Segmented nodal admittance matrix; Calculate the induced voltage and circulating current distribution of the cable sheath and return conductor segment by segment based on the boundary conditions and the nodal admittance matrix. The method of the invention can accurately describe the influence of the overhead laying environment on the bridge-laying cable system, and at the same time consider the influence of the line distribution parameters, and can accurately calculate the induced voltage and circulation distribution of the cable sheath and the return conductor, and provide grounding for the bridge-laying cable system. Design provides the computational basis.
Description
technical field [0001] The invention belongs to the technical field of power transmission, and in particular relates to a calculation method for sheath induced voltage and circulating current of a bridge-laying cable system. Background technique [0002] With the proposal of the "Global Energy Internet" strategy and the rapid development of marine energy projects, the development scale of offshore wind power generation and offshore oil and gas resource exploitation projects has continued to expand, and the offshore economy has developed rapidly. The construction of offshore power transmission systems has become my country's future power system. One of the keys to development. As an important part of the new energy cross-sea transmission system, power cables laid by bridges are more economical and reliable in operation and maintenance than submarine cables, and have become the preferred choice for cross-sea transmission systems. [0003] Different from conventional undergroun...
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IPC IPC(8): G06F30/20G06F111/04G06F113/16
CPCG06F30/20G06F2111/04G06F2113/16
Inventor 陈向荣徐星孟繁博杜振东刘燕平周文俊裘立峰
Owner ZHEJIANG UNIV