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Resonant Analysis Method of Single Core Power Cable Based on Finite Element Simulation and Equivalent Circuit

A single-core power cable, equivalent circuit technology, applied in electrical digital data processing, instruments, calculations, etc., can solve problems such as less research on high-frequency harmonic resonance problems

Active Publication Date: 2018-02-09
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few studies on the high-frequency harmonic resonance that may occur on the core wire and metal sheath loop system of the single-core power cable itself

Method used

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  • Resonant Analysis Method of Single Core Power Cable Based on Finite Element Simulation and Equivalent Circuit
  • Resonant Analysis Method of Single Core Power Cable Based on Finite Element Simulation and Equivalent Circuit
  • Resonant Analysis Method of Single Core Power Cable Based on Finite Element Simulation and Equivalent Circuit

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Embodiment Construction

[0035] Such as figure 1 As shown, the single-core power cable resonance analysis method based on finite element simulation and equivalent circuit of the present invention includes the following steps in turn:

[0036] A. Within the harmonic frequency range of power system power frequency 50Hz to 5000Hz, a set of frequency values ​​are preset from small to large, and the distribution parameters of single-core power cables at each frequency are calculated. Single-core power cables include core wires And the metal sheath set on the outside of the core wire, the distribution parameters include the resistance per unit length of the core wire, the inductance per unit length of the core wire, the resistance per unit length of the metal sheath, the self-inductance per unit length of the metal sheath and the core wire to metal Capacitance per unit length of the sheath; In this embodiment, 9 groups of frequencies are selected from the power frequency of 50 Hz to 50000 Hz, and the select...

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Abstract

The invention discloses a single-core power cable resonance analysis method based on finite element simulation and equivalent circuit. The finite element simulation is used to accurately calculate the resistance per unit length of the core wire, the inductance per unit length of the core wire, the metal The resistance per unit length of the sheath, the self-inductance per unit length of the metal sheath, and the capacitance per unit length of the core wire to the metal sheath, and use circuit simulation to simulate and analyze the core wire, metal sheath and ground system of the single-core power cable and cable. The resonance conditions under different grounding methods are used in the field of resonance analysis of single-core power cables. Resonance fault diagnosis and prediction have great reference value and significance.

Description

technical field [0001] The invention relates to the technical field of state monitoring of power system equipment, in particular to a single-core power cable resonance analysis method based on finite element simulation and equivalent circuit. Background technique [0002] As an important part of the power system, single-core power cables occupy a very important position in the power grid. The harmonic problems of single-core power cables are becoming increasingly prominent in the current power system. The structure of the single-core power cable makes it have certain distributed parameters, such as distributed inductance and distributed capacitance. In the case of power frequency, the influence of distributed parameters on the normal operation of single-core power cables can be ignored, but when the higher-frequency harmonics occupy a certain component, local resonance overvoltage and resonance may be formed in single-core power cables. Overcurrent will affect the normal op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 刘书铭李琼林赵通王振东代双寅杜志叶阮江军
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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