Direct current earth electrode line flashover fault circuit model, analysis method and system based on arcing of arcing horn

Abstract

The invention provides a direct current earth electrode line flashover fault circuit model, an analysis method, and a system based on the arcing of an arcing horn. By employing an earth electrode line during flashover fault and the arcing condition of the arc horn of a fault tower, an external circuit volt-ampere curve and a static volt-ampere curve of an arc are constructed, the stable burning point of the arc is determined according to the intersection of the two curves, and various electrical parameters of the direct current earth electrode line flashover fault state are calculated. According to the direct current earth electrode line flashover fault circuit model, the analysis method, and the system, the research of direct current earth electrode line faults can be conducted, the calculating process of fault analysis is simple, line operation personnel can develop analysis work of the line faults, the accuracy of fault analysis can be improved, stable and reliable operation of a direct current power transmission system is guaranteed, and the working strength is reduced.

Description

technical field [0001] The present invention relates to the technical field of direct current transmission, in particular to a DC grounding electrode line flashover fault circuit model based on arcing angle establishment, and a DC grounding pole line flashover fault analysis method and arc establishment based on arcing angle system. Background technique [0002] The grounding pole line is the current diversion line connecting the neutral busbar of the DC converter station and the grounding pole site, and is a line that introduces DC current into the earth. For bipolar direct current transmission system, when one pole conductor or one pole converter stops working, the other pole converter, grounding pole line and the earth can still be used to form a loop to transmit half of the capacity of electric energy, so the grounding pole line is The flexible operation of DC transmission system plays an important role. However, since the operating voltage of the grounding electrode l...

AI Technical Summary

Problems solved by technology

However, because the operating voltage of the grounding electrode line is very low, generally less than 10kV, and it is designed according to the requirements of 35kV or 110kV level lines, the insulation level of the line itself is low, resulting in a high probability of flashover faults in the grounding electrode line

[0004] (1) Focusing on the analysis of system operation, the process of line flashover and arc establishment is not fully considered in the calculation modeling, and the transition resistance is not clear, and the simulation of the electrical characteristics of the grounding position needs to be improved

[0005] (2) Fault analysis is mainly carried out from the perspective of relay protection. The calculation process is complicated and lacks the simplicity of operation, which is not convenient for transmission line maintenance personnel to use when analyzing line faults.

Images