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Cross-voltage-class same-tower four-circuit fault line selection method and device

A technology of fault line selection and voltage level, which is applied in the direction of fault location, measuring device, fault detection according to conductor type, etc., can solve problems such as research on the principle of line selection of four-circuit lines on the same tower without crossing voltage

Pending Publication Date: 2020-09-15
南京国电南自新能源工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on cross-voltage level four-circuit lines on the same tower, mainly focusing on fault analysis, calculation of short-circuit current and fault distance measurement, etc., and no research on the principle of line selection for this type of cross-voltage four-circuit line on the same tower Research

Method used

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  • Cross-voltage-class same-tower four-circuit fault line selection method and device
  • Cross-voltage-class same-tower four-circuit fault line selection method and device
  • Cross-voltage-class same-tower four-circuit fault line selection method and device

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Embodiment

[0180] Through the PSCAD / EMTDC platform to build such as figure 1 The simulation model of the four-circuit transmission line on the same tower across the voltage level is shown, and the simulation analysis of various fault types and states is carried out. The system parameters are as follows: the voltage level of the Ⅰ and Ⅱ circuit lines is 220kV, the voltage level of the Ⅲ and Ⅳ circuit lines is 500kV, and the total length of the line is 100km. The positive sequence impedance of the M terminal power supply is j48Ω, and the zero sequence impedance is j96Ω; the positive sequence impedance of the N terminal power supply is j16Ω, and the zero sequence impedance is j32Ω; the positive sequence impedance of the P terminal power supply is j60Ω, and the zero sequence impedance is j96Ω; The positive sequence impedance of the power supply is j20Ω, and the zero sequence impedance is j32Ω. The commutation method of the transmission line is commutation within each circuit, and no commuta...

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Abstract

The invention discloses a cross-voltage-class same-tower four-circuit fault line selection method and device. The method comprises the following steps: obtaining a line model impedance matrix; carrying out phase-mode transformation processing on the line model impedance matrix Z to obtain mutually independent current and voltage moduli; and analyzing a relationship between the independent currentmoduli to carry out fault line selection judgment. According to the invention, fault line selection judgment of the same-tower four-circuit power transmission line of the cross-voltage level is realized.

Description

technical field [0001] The invention belongs to the technical field of fault judgment, and in particular relates to a fault line selection method and device for a four-circuit line on the same tower across voltage levels. Background technique [0002] The multi-circuit line on the same tower is widely used in the power system because of its narrow transmission corridor, which can improve land utilization and transmission capacity, and has a greater cost advantage. With the development of power grid technology, the double-circuit line system on the same pole has a certain scale. Recently, a four-circuit line system with different voltage levels has appeared, that is, a four-circuit line composed of two double-circuit lines on the same pole with different voltage levels. Its main feature is that there is mutual inductance between lines, and there are many types of faults, and the calculation and configuration of relay protection are complicated. When a transmission line fails...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/086G01R31/52G01R31/58
Inventor 郭培育许滢王永锋陈清赵欣
Owner 南京国电南自新能源工程技术有限公司
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