简介:【摘要】变电站内直流系统是绝缘系统,正常时,正、负极对地绝缘电阻相等,正、负极对地电压平衡。发生一点接地时,正、负极对地电压发生变化,接地极对地电压降低,非接地极电压升高,在接地发生和恢复的瞬间,经远距离、长电缆起动中间继电器跳闸的回路可能因其较大的分布电容造成中间继电器误动跳闸(可采用较大起动功率的中间继电器来避免),除此之外,对全站保护、监控、通讯装置的运行并没有影响。但是,存在一点接地的直流系统,供电可靠性大大降低,因为在接地点未消除时再发生第二点接地,极易引起直流短路和开关误动、拒动,因此应避免直流接地故障的发生,提高直流系统可靠性。
简介:摘要:随着科学技术的迅猛发展,现代炼铁系统和技术获得了 持续的进步,但是从环境、能源及资源的角度来看,我国炼铁系统存在较大的环境压力。因此,必须要加强对炼铁系统节能减排技术的研究。论文 主要针对炼铁系统节能减排技术的现状以及发展趋势进行探究,指出具体的节能减排的措施以及要点,希望能够为我国炼铁系统的节能减排工作提供一定的参考。 ABSTRACT: With the rapid development of science and technology, modern ironmaking system and technology have made sustained progress, but from the point of view of environment, energy and resources, China's ironmaking system has greater environmental pressure. Therefore, it is necessary to strengthen the research on energy saving and emission reduction technology of ironmaking system. This paper mainly explores the current situation and development trend of energy saving and emission reduction technology in ironmaking system, and points out the specific measures and key points of energy saving and emission reduction, hoping to provide some reference for energy saving and emission reduction work of ironmaking system in China.
简介:摘要: 核电厂运行中仪控系统所发挥的作用是不容忽视的,随着仪控系统智能化、自动化发展,其所面临的通信网络安全问题也随之增多,论文结合现状对核电数字化仪控系统通信网络展开探讨。 Abstract: T he role of i nstrument and c ontrol system in the operation of nuclear power plant can not be ignored. With the development of i nstrument and c ontrol system intelligence and automation, the communication network security problems faced by it also increase. This paper discusses the communication network of digital i nstrument and c ontrol system of nuclear power plant based on the current situation.