Sheath induced voltage and circulation calculation method of bridge-following cable laying system
A technology for laying cables and induced voltage, which is applied in the field of sheath induced voltage and circulating current calculation
Active Publication Date: 2020-12-18
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 sheath induced voltage and circulation calculation method for a bridge-following cable laying system, and the method comprises the steps: obtaining a unit length series impedance matrix and a unit length parallel admittance matrix of the bridge-following cable laying system through derivation according to the geometric structure, basic material parameters and overhead transmission characteristics of the bridge-following cable laying system; determining a unit length node admittance matrix; according to node constraint conditions, deriving cascade formulas of different-order matrixes and same-order matrixes, and conducting calculating to obtain a complete node admittance matrix and a segmented node admittance matrix of the bridge-following cable system; and according to the boundary condition and the node admittance matrix, calculating the induced voltage and the circulation distribution of the cable sheath and the backflow conductor section by section. The method can accurately describe the influence of the overhead laying environment on the bridge-following cable laying system, considers the influence of line distribution parameters, can accurately calculate the induced voltage and circulation distribution of the cable sheath and the backflow conductor, and provides a calculation basis for the grounding design of the bridge-following cable system.
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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Login to View More 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