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

A fault analysis method, DC grounding technology, applied in the direction of the fault location, etc., can solve the problems of low insulation level, inconvenient use, complicated calculation process, etc., and achieve the effect of reducing work intensity, small calculation error, and simple process

Active Publication Date: 2015-09-23
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
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  • Claims
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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.

Method used

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

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Experimental program
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Embodiment

[0050] Whether the arc angle can establish a stable DC arc mainly depends on the mutual cooperation between the static volt-ampere curve of the stable arc between the arc angles and the load line of the linear source-port network equivalent to the circuit other than the arc, that is, the establishment of the arc angle. The premise of the arc is that there is an intersection point between the arc volt-ampere curve and the load line of a port network. Therefore, the basic idea of ​​the present invention is to build a model around the electric arc and the external circuit loop, determine the arc current (DC freewheeling current) and voltage of the arc angle through the intersection of the two-part circuit volt-ampere curve and the load line, and then calculate the Electrical parameters in case of ground electrode line flashover fault.

[0051] Firstly, the DC ground electrode line flashover fault circuit model based on the striking arc angle proposed by the present invention is d...

example

[0106] In order to enable those skilled in the art to understand the technical solution of the present invention more intuitively, a specific example is used below to illustrate.

[0107] Taking the ground electrode line of a DC transmission system as an example, under the operating condition of the ground electrode current of 1200A, there have been 3 incidents of lightning flashovers that caused the system to restart. The line parameters and fault conditions are as follows:

[0108] The total length of the ground electrode line l 1 =143.836, the distances from the faulty tower A, faulty tower B, and faulty tower C to the converter station are l 2A =12.984km, l 2B =22.12km, l 2C =30.627km, equivalent resistance R of grounding pole e =0.25Ω, the grounding resistance of faulty tower A, faulty tower B, and faulty tower C are respectively R tA =4.2Ω, R tB =4.7Ω, R tC =4.5Ω, the gap length l=38.5cm.

[0109] According to the above parameters, the parallel equivalent resista...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王敩青杨跃光苏国磊张建刚郑鑫陈欢
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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