低压成套开关设备的电击防护及电气设备安全研究

随着经济的不断发展,电能已经成为人们日常生活中的重要能源之一。由于电能本身具备的特殊性质,使得其在供应与使用过程中,可能会给人们带来一定的安全问题。因此,在长期的发展过程中,社会各界都致力于对电气设备安全问题的讨论。电压不稳是当前电能使用量不断提高导致的主要问题,尤其是在某些特殊时段,人们会出现用电高峰期,从而使得电压的稳定性受到严重的影响。低压成套开关设备就是为了有效地减少由于电压不稳所带来的一些安全问题。本文针对该设备的内涵加以界定,并就其基本设计概念加以分析,希望能对我国用电安全问题的解决提供有利参考。

在监测系统中实现风电瓦斯闭锁

本文论述了在煤与瓦斯突出矿井通过对井下掘进工作面闭锁设施的分析和部分改线,利用安全监控系统实现风电瓦斯闭锁。

IEC火花试验装置灵敏度分析

火花试验装置的灵敏度会受到环境因素、钨丝电极与镉盘电极等因素的影响。对IEC火花试验装置钨丝电极与镉盘电极在1个检测周期内的交汇/分离轨迹进行了分析,特别区分出钨丝从镉盘通槽"凹入"和"凹出"2种特殊情况;对钨丝电极在镉盘凹槽内的分离角度进行分析,指出分离角度范围为9°~86°,其中接近于垂直分离情况仅占50%;分离角度不同造成分离用时相差6.38倍,进而影响钨丝分离初速度,进而造成火花试验装置每次开路火花灵敏度的明显不同。

Electromagnetic Fields and Induced Voltages on Underground Pipeline in the Vicinity of AC Traction System

Various regulations, aimed at the protection of human beings and electrical equipment against possible adverse effects resulting from exposure to electromagnetic fields, have been issued in many countries. Most of them are based on safety guidelines published by international expert groups. In this paper, electric and magnetic fields are calculated in the vicinity of 25 kV traction line supplying railway traction systems. Calculation results are compared to exposure limits specified by safety guidelines and regulations. Possible countermeasures for reduction of electromagnetic fields are proposed. Also, this paper presents a method for calculation of the induced voltages to an underground gas pipeline from a neighbouring 25 kV electric traction overhead line in case of short circuit. Calculations are performed with EMTP-ATP software. Possible countermeasures for reduction of induced voltages are proposed.