降低某低压电网弧光接地过电压的措施分析

摘要

由于国内人民生活水平的提高，科技不断地进步，控制不断地完善，从而促使故障选线和保护设计技术在电气系统领域占据主导权，也使得低压电网弧光接地过电压故障及保护系统被广泛应用。在电力系统设计领域中，低压电网弧光接地过电压故障及保护系统成为目前一处亮丽的风景线，因为其设计资源众多，开发经验丰富，最重要的是成本较低，基本在购买者的承受范围以内，因此低压电网弧光接地过电压故障及保护系统设计逐渐成为世界各国关注的重点。随着低压电网弧光接地过电压故障及保护系统领域的不断革新，数量越来越大，逐渐成为研究的重点方向，因此新一代的我们要认真去研究低压电网弧光接地过电压故障及保护系统的构成。

低压电网弧光接地过电压故障及保护系统一直是研究的热点，本文基于低压电网弧光接地过电压故障及保护系统的特征，提出利用多层控制的弧光接地过电压故障保护综合控制策略，然后利用故障后产生的零序电流，对接地故障进行定位。低压电网弧光接地过电压故障及保护系统事指中性点接地方式为非有效接地，短路电流很小，保护装置不需要立即动作跳闸，从而提高了系统运行的可靠性，但是如果不能完成对故障线路处埋，容易扩大为两相对地短路，威胁电力系统的安全运行。本次设计对故障情况及其保护方法进行了简要分析并进行建模分析。

关键词：弧光接地过电压；电弧模型；故障保护

Abstract

Due to the improvement of domestic people's living standards, the continuous progress of science and technology, and the continuous improvement of control, the fault line selection and protection design technology occupy the dominant position in the field of electrical system, and also make the arc grounding overvoltage fault and protection system of low-voltage power grid widely used. In the field of the electrical system design, low-pressure power over-voltage of arc light earthing fault and protection system is now a beautiful scenery line, because of its large number of design resources, rich development experience, the most important thing is that the cost is low, the control within the scope of the users will be able to afford, so the low voltage power grid over-voltage of arc light earthing fault and protection system design gradually become the focus of world attention. With the continuous innovation in the field of low-voltage power grid arc grounding overvoltage fault and protection system, the number is increasing and gradually becoming the focus of research. Therefore, the new generation of us should seriously study the low-voltage power grid arc grounding overvoltage fault and the composition of protection system.

Faults and low voltage power grid over-voltage of arc light earthing protection system has always been the hot spot of the research, this article is based on low voltage power grid over-voltage of arc light earthing faults and the characteristics of the protection system, put forward using the multilayer control fault protection of over-voltage of arc light earthing comprehensive control strategy, and then use after failure of zero sequence current, ground fault location. About faults and low voltage power grid over-voltage of arc light earthing protection system refers to the neutral point grounding way is not effective, short circuit current is very small, do not need immediate action tripping protection device, so as to improve the reliability of the system is running, but if you can't complete the buried fault line, easy to expand into two relatively short circuit, threatening the safe operation of power system. This design has carried on the brief analysis to the fault condition and the protection method and carries on the modeling analysis.

Key words: Arc grounding overvoltage; Arc model; Fault protection

目录

摘要.......................................... 1

第一章 绪论................................... 1

1.1 课题背景及研究现状..................... 1

1.2 低压电网弧光接地过电压故障系统技术的现状 3

1.3 课题研究的意义......................... 4

1.4 课题的研究内容及章节安排............... 5

第二章 低压电网弧光接地过电压的产生........... 6

2.1 低压电网弧光接地过电压产生的原因....... 6

2.2 低压电网弧光接地过电压的对应措施....... 7

2.3 传统的弧光接地过电压理论............... 9

第三章 弧光接地过电压保护措施分析............ 11

3.1 弧光接地过电压的产生机理.............. 11

3.1.1 高频熄弧理论..................... 11

3.1.2 工频熄弧理论..................... 11

3.1.3 介质强度恢复理论................. 13

3.1.4 总电流过零熄弧理论............... 13

3.2 电弧接地故障模型分析.................. 14

3.2.1 中性点经消弧线圈接地故障分析..... 15

3.2.2 中性点经小电阻系统故障分析....... 16

3.3系统的无功补偿分析..................... 17

3.3.1 无功补偿设备的选择............... 17

3.3.2 并联电抗器的补偿分析............. 18

第四章  .........................

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降低某低压电网弧光接地过电压的措施分析资源-CSDN文库