摘要
在煤矿井下3.3KV的供电系统中,移动变电站是向采区工作面提供可持续电能的枢纽。移动变电站的安全可靠运行是整个采区工作面的可靠运行的必要条件,一旦发生故障没有及时处理,不仅影响井下作业的持续运行,甚至造成重大安全事故。随着煤矿安全生产受到越来越多的关注,开发出可进行在线监测与控制的自动化系统,实时监控移动变电站运行状态,并根据各种在线检测参数的异常诊断出故障类型,鉴定出故障原因,及时排除故障显得尤为重要。
本文根据煤矿井下供电自动化的要求,深入地研究了矿井移动变电站故障检测与诊断系统。首先根据井下移动变电站的结构特点,深入分析了移动变电站的各种典型故障:真空断路器真空度劣化及开关机械特性故障,绝缘劣化引起的变压器绕组短路故障以及变压器输出端三相线路故障,并根据各种故障特点,分析了相应的检测方法及原理。针对传统变压器保护方法不能准确地诊断出变压器励磁涌流与内部故障的问题,提出了利用小波变换分析法来鉴别励磁涌流,并引入了改进递归小波变换算法。采用Matlab对改进递归小波算法进行仿真,仿真结果表明此算法能够快速地鉴别出励磁涌流的畸变性,满足了实时性要求。最后采用DSP芯片和80C196KC双CPU结构,来完成整个系统的数据采集、处理分析,满足了数据处理的快速性要求,同时实现了系统的多种功能测控;并设计了CAN总线通信节点,实现了高速可靠的总线网络通信。
In the 3.3kV power system of mine area, mobile transformer substation is hub of mine power system which provides continuous power to mine area . The safety and reliable running of mobile transformer substation is the essential foundation of mine area running. The fault of mobile transformer substation will affect continuous running of mine work. What is worse, the fault of substation will cause safe accident. With more and more attention on mine safe production, it is important to design substation automation system, which can monitor running state of substation to diagnose fault sort and remove fault on lime.
Based on the request of power supply automation in coal mine, the thesis studied monitor and diagnosis system of mine mobile transformer substation. Based on structure of mobile transformer substation, a lot of classic fault and diagnosis theory were analyzed firstly, such as the vacuum deterioration of vacuum breaker, winding short-circuit and three-phase short-circuit of transformer. Secondly the thesis adopted Wavelet transform to identify inrush current and proposed improved recursion Wavelet transform arithmetic. And the simulation illustrated the arithmetic which satisfied the real time request was able to identify aberration of inrush current .At last, the thesis adopted DSP and 80C196KC to realize data collection, analyze and communication of monitor and diagnosis system of mine mobile transformer substation, which can satisfy rapidity of data process and multi-function. As the same time, the system designed CAN bus node for the reliable and high-speed communication.
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