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Overvoltage improvement method on basis of historical data of overhead power transmission line

A technology of overhead transmission lines and historical data, which is applied in the direction of circuit devices, AC network circuits, electrical components, etc., and can solve problems such as potential safety hazards in the operation of transmission lines

Inactive Publication Date: 2014-11-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few similar research results on high-altitude, long-distance, cross-regional and complex transmission lines. Up to now, there is no complete and reasonable overvoltage improvement method to effectively deal with transmission line insulator flashover accidents. There are problems in the operation of transmission lines. major safety hazard

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0014] The invention discloses an overvoltage improvement method based on historical data of overhead transmission lines, which is characterized in that:

[0015] ① Select the frequent flashover section of the transmission line based on historical data, and use electromagnetic transient analysis to determine Calculate the resistance, inductance, and capacitance of the zero-sequence and positive-sequence lines;

[0016] ② Calculate the parameters of the power supply, including: line transmission capacity, load side power factor, three-phase and single-phase short-circuit current of the substation, and equivalent positive-sequence impedance and equivalent negative-sequence impedance of the substation;

[0017] ③ If there are high-voltage shunt reactors installed at both ends of the line, then obtain the parameters of the shunt reactor, including: rated voltage, rated capacity, and compensation during operation;

[0018] ④ Obtain circuit breaker parameters, including: circuit br...

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Abstract

The invention discloses an overvoltage improvement method on the basis of historical data of an overhead power transmission line, which is mainly characterized in that a flashover frequency section of the power transmission line is selected on the basis of the historical data; and according to a line transposition mode, a structural size of a tower and types and structural sizes of a wire and an overhead ground wire which are selected by the power transmission line, resistances, inductances and capacitances of a zero sequence and a positive sequence of the line are calculated by utilizing electromagnetic transient analysis, so that by integrating overvoltage calculations in various operating modes, one method for improving an overvoltage is disclosed and a corresponding strategy is called in a targeted manner, and thus, the overvoltage improvement method is beneficial for implementing differentiation design of the line.

Description

technical field [0001] The invention belongs to the technical field of power grid transmission lines, and relates to an overvoltage improvement method for overhead transmission lines. Background technique [0002] In recent years, insulator flashover tripping accidents have occurred many times in the transmission lines of various voltage levels in the power grid, especially in the Northwest Power Grid, which has had a major impact on the reliability of power supply in the power grid and caused great economic losses; according to the analysis of flashover accidents, the pollution accumulated on the surface of insulators It is one of the main causes of flashover. In view of the randomness, variability and multiple influencing factors of pollution, the calculation of line overvoltage is particularly important. There are few similar research results on high-altitude, long-distance, cross-regional and complex transmission lines. Up to now, there is no complete and reasonable over...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 郭洁项阳温定筠吕景顺马建海
Owner XI AN JIAOTONG UNIV