探讨低压剩余电流动作保护器的选择和常见故障

随着我国市场经济的发展和深入,电气设备在各个领域得到越来越广泛的应用。无论是日常生活,还是各行各业的生产过程中,电气设备都已经成为不可缺少的物质基础。虽然电气设备的使用给人们的生活、生产带来了极大的便利,但在使用电气设备的过程中,由于诸多原因也存在许多安全隐患,比如漏电和人身触电等。这些安全隐患始终都在威胁着人们的生命和财产安全,因此,必须重视剩余电流动作保护器的正确选择和合理使用,充分发挥剩余电流动作保护器能显著降低线路和设备的漏电、触电事故的功能,最大限度地保护低压配电线路、用电设备以及人们的生命财产安全。本文就针对剩余电流动作保护器的选用和故障进行简要的阐述。

变电站所用电系统配电开关欠压脱扣动作造成所用电失压分析与防范措施

某500kV变电所因一台所变检修改变所用电系统运行方式，因另一回外来所电瞬时故障，造成500kV变电站所用电系统380／220V配电开低压脱扣动作，所用电全失，严重影响500kV变电站安全，经分析不同的所用电接线方式可能存在风险，进行配电开关改造，从而消除了上述隐患，提高所用电系统可靠性。

浅析低压漏电保护器在供电系统中的应用

漏电保护系统是低压供电系统的重要组成部分,是整个系统安全可靠运行,避免发生触电事故的重要保障。目前在我国漏电保护器已经广泛的应用到了低压供电系统中,为供电工作中人身安全和设备运行稳定提供了保障。文章通过对低压漏电保护器在具体工作原理和漏电保护器对供电系统的要求进行阐述,提出一些方法和意见,并结合实际情况提出使用中的注意事项。

WJF-1微机频率电压自动减载装置的改进建议

介绍了WJF 1微机频率电压自动减载装置在试运期存在的问题及消除缺陷的情况。并建议厂家对装置做进一步的完善 ,提出要增强说明书的编写工作 ,改善信息记录及增加防过切负荷功能。

An approach for IC engine coolant energy recovery based on low-temperature organic Rankine cycle

To promote the fuel utilization efficiency of IC engine, an approach was proposed for IC engine coolant energy recovery based on low-temperature organic Rankine cycle(ORC). The ORC system uses IC engine coolant as heat source, and it is coupled to the IC engine cooling system. After various kinds of organic working media were compared, R124 was selected as the ORC working medium. According to IC engine operating conditions and coolant energy characteristics, the major parameters of ORC system were preliminary designed. Then, the effects of various parameters on cycle performance and recovery potential of coolant energy were analyzed via cycle process calculation. The results indicate that cycle efficiency is mainly influenced by the working pressure of ORC, while the maximum working pressure is limited by IC engine coolant temperature. At the same working pressure, cycle efficiency is hardly affected by both the mass flow rate and temperature of working medium. When the bottom cycle working pressure arrives at the maximum allowable value of 1.6 MPa, the fuel utilization efficiency of IC engine could be improved by 12.1%.All these demonstrate that this low-temperature ORC is a useful energy-saving technology for IC engine.

HX_D3B型电力机车调试试验技术

通过介绍HX_D3B型电力机车的低压动作试验和高压动作试验的过程,详尽地说明了该型机车的调试试验程序、技巧和故障排查分析处理的方法。阐明了在大功率电力机车的调试技术中,线路检测和功能测试工作的重要性,为机车的制造和检修提供了有效的技术支持。