高产高效工作面33kV组合开关的设计与试验研究.docx

1、高产高效工作面33kV组合开关的设计与试验研究分类号 密级太原理工大学工程硕士学位论文题 目 高产高效工作面3.3kV组合开关的设计与试验研究Design and Experiment Research on the 3.3kV Combined Switchgear for High Efficiency Coal Mining Face 英文并列题目研究生姓名： 学 号： 工 程 领 域： 电气工程 研 究 方 向： 导 师 姓 名： 职 称： 教 授 论文提交日期： 2007/5 授予学位单位：太原理工大学 地 址： 山西太原 太 原 理 工 大 学高产高效工作面3.3kV组合开关的设计

2、与试验研究摘 要3.3kV供电系统是90年代以后从国外引进的，采用3.3kV供电系统后极大地提高了煤矿井下的生产效率，形成了“一矿一井一面”的生产模式，这正是我国未来煤炭生产的发展趋势。然而由于我国在这方面的研究起步较晚，目前3.3kV系统的供配电设备全部依赖进口。从国外进口设备不但价格昂贵，而且配件供货周期长，严重制约着3.3kV高产高效工作面在我国煤炭行业的普及和发展。因此研究3.3kV组合磁力控制站不仅具有重大的经济价值，而且对于实现产品的国产化具有重要的现实意义。长期以来，国产煤矿井下电动机综合保护系统，原理简单、可靠性低、稳定性差，电动机烧毁现象时有发生。针对这种现象，本人参与了“高

3、产高效工作面3.3kV组合开关”的研制工作，开发了工业性能样机，利用该样机进行了工业性试运行，各项性能指标均达到了设计要求，满足煤矿井下国产高压电气设备集控化、智能化的技术要求，主要内容如下：首先介绍了3.3kV供电系统在国内外煤矿井下的应用和发展，阐述了研究该保护系统的必要性和紧迫性，通过对现有技术条件和国内对3.3kV供电系统的研究现状分析，论证了研究3.3kV组合磁力控制站的可行性，并根据现场的实际要求，提出了整个保护系统的性能指标、保护功能和技术要求，制定了相应的控制策略和控制方法。根据现场实际情况，提出了能够满足煤矿井下综采工作面驱动电动机工作特性要求的组合开关整体方案。试验结果表明

4、，该方案设计合理，能够指导系统开发，为工业样机的形成奠定了基础。根据3.3kV供电系统的运行特点及被控电动机的起动要求，分析了在实际运行过程中可能发生的故障，设计了相应的保护电路，并制定了相应的技术指标。系统中所设置的保护主要有：漏电闭锁、漏电保护、短路保护、过载保护、两相短路保护、断相保护和电压保护。实验结果证明本文所设计的保护原理可行、性能稳定、动作可靠、灵敏度高。针对井下工作环境恶劣、干扰信号强的特点，设计了组合开关防爆兼本质安全型外壳，保证腔体内元件在正常工作或故障状态下所产生的火花能量均不足以引燃瓦斯爆炸，保障了组合开关的运行安全性。关键词：3.3kV供电系统，组合开关，高产高效，防

5、爆Design and Experiment Research on the 3.3kV Combined Switchgear for High Efficiency Coal Mining FaceAbstractThe efficiency of coal production has been greatly improved since 3.3kV distribution networks was introduced from developed countries in the 1990s, and a new production mode has been formed,

6、i.e. there is only one well and one working face in one colliery, which is the developing direction of coal production in our country in the future. However, it is still backward in the research field of 3.3kV power supply equipment in our country so that all of the electrical equipment in 3.3kV und

7、erground distribution networks are mainly imported from developed countries. It is quite evident that it is very important and urgent to develop the measurement and control system of the combined magnetic switchgears used in 3.3kV underground distribution networks.There have been many problems such

8、as simple protective principle, lower reliability and worse stability in motor protection systems at a long time, so that the phenomenon resulted in motors burned out is happened frequently. According to the situation, it is necessary to take the 3.3kV mining flameproof intelligent combined switchge

9、ar as the research project in this thesis. The sample system for industrial application has been manufactured. The testing works have been done with the sample and the satisfied results have been achieved as following:First of all, the development and the application of 3.3kV distribution networks i

10、n underground at home and abroad are reviewed, the necessity and exigency to develop the measurement and control system are also introduced. It has been proved by the investigation and analysis in the field that it is feasible to develop the 3.3kV flameproof combined vacuum switchgear in technology

11、and engineering. The protective functions and technical specifications of the measurement and control system are put forward, and the control strategies and methods by MCU are also drawn up according to the field requirements.According to the field requirements, the general scheme of measurement and

12、 control system of combined switchgear is proposed which can meet the requirements of motors which are used for driving the operating properties installed in underground. It has been shown by experiment results that the scheme is reasonable so as to develop LCC, which lays a foundation to establish

13、the sample system for industrial application.The electrical faults occurred in underground power system networks are analyzed according to the specifications of 3.3kV distribution networks and the start requirements of asynchronous motors. The protection circuits are designed and the technical speci

14、fications are established based on different electrical characteristics. The main protective functions in the measurement and control system include: earth leakage lockout, earth leakage, symmetric short circuit, overload, asymmetric short circuit, one phase open, over-voltage and under-voltage. All

15、 the protective circuits designed in this paper have been tested and the results show that the protective circuits are feasible in theory, stable in performance, reliable in action and sensitive to electrical faults.On the basis of actual situations of underground 3.3kV distribution networks, Explod

16、er isolator and intrinsical safety shell has been designed. The shell can protected the inner component working, in order to protect the combined switchgear working safety.Keywords: 3.3kV distribution network，Combined Switchgear，High Efficiency Coal Mining Face，Exploder arrester第一章 绪论1.1 3.3 kV供电系统在井下的应用 随着现代科学技术的飞速发展和煤炭生产效率的不断提高，采煤工作面单台装机容量也越来越高。目前，现代化矿井大多采用一矿一井一面的生产模式，客观上要求采煤设备运行时间更长，出煤速度更快，且能