EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method

An ultra-high voltage DC, line insulation technology, used in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. It can improve the reliability of operation, avoid overvoltage breakdown, and avoid the failure of DC freewheeling to extinguish the arc.

Inactive Publication Date: 2016-09-21
CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP
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Problems solved by technology

[0012] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology, and to provide a method for insulation coordination of UHV DC grounding pole lines, and to provide a differentiated The insulation configuration scheme effectively solves the problems of operation overvoltage breakdown and lightning DC freewheeling arc extinguishing

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  • EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method
  • EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method
  • EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method

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Embodiment Construction

[0034] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, they are only examples, and at the same time, the advantages of the present invention will become clearer and easier to understand.

[0035] A method for insulation coordination of UHV DC grounding electrode lines, such as figure 1 shown, including the following steps:

[0036] Step 1. Select the arc angle gap value according to the operating overvoltage level. The specific steps are:

[0037] Step 1-1, determine the overvoltage distribution along the ground electrode line;

[0038] Step 1-2, determine the operating impact 50% discharge voltage of different gaps;

[0039] Steps 1-3, based on the overvoltage distribution, the arc angle gap and the operating shock tolerance level, determine the configuration results of the arc angle gap along the line.

[0040] Step 2. Select the a...

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Abstract

The invention discloses an insulation coordination method for a UHV DC grounding electrode line. Including the following specific steps: step 1, select the arc angle gap value according to the operating overvoltage level; step 2, select the arc angle gap value according to the arc extinguishing ability; step 3, comprehensively select the gap according to the operating overvoltage level and arc extinguishing ability Based on the conclusion, the final arc angle configuration results are proposed. The design scheme of this method comprehensively considers the overvoltage along the UHV DC grounding electrode line and the arc extinguishing ability of the arcing angle, and uses the intersection method of the volt-ampere characteristic curve to determine the arcing angle gap value, which meets the insulation coordination requirements of the UHV DC grounding electrode line. , avoiding the technical problems of overvoltage breakdown of the UHV DC grounding electrode line and the inability to extinguish the arc due to DC freewheeling, and improving the operational reliability of the UHV DC grounding electrode line.

Description

technical field [0001] The invention relates to the field of insulation coordination of UHV DC grounding pole lines, and more specifically relates to a method for insulation coordination of UHV DC grounding pole lines. Background technique [0002] The DC earth return system (ground electrode and ground electrode line) is one of the important components of the DC transmission system. The operation mode of the DC transmission system is flexible and diverse, and the working mode of the ground electrode is also different. In the single-pole ground return line operation mode, all the conveying current of the running pole flows into the earth through the grounding pole. In order to reduce the impact of the inflow current on the power equipment of the converter station, the ground electrode is generally arranged at a position far away from the converter station. The ground electrode line is the line connecting the converter station and the ground electrode (usually an overhead l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08H02H9/04
CPCH02H9/08H02H9/04
Inventor 张冯硕李健曾连生吴高波吴庆华黄欲成刘文勋张瑚岳浩周成均
Owner CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP
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