Results 1 to 10 of about 682 (106)
Research progress on the two-phase flow migration law of coal and gas outburst [PDF]
, 2023 Coal and gas outburst is an extremely complex dynamic phenomenon in coal mines. It is mainly manifested as gas suffocation, pulverized coal impact and burial, which seriously threatens the safety production of coal mines.
Chaolin ZHANG +4 more
core +1 more source
Study on the impact force evolution law of coal and gas outburst under high ground stress [PDF]
, 2023 With the increase of mining depth and intensity, the dynamic disaster of coal and gas outburst was frequent. The disaster-causing mechanism of impact force has become the main direction of current research.
Honghao YU +4 more
core +1 more source
Energy principle of simulation experiments on coal and gas outburst [PDF]
, 2023 Coal and gas outburst is an extremely destructive gas dynamic disaster in mines. Since such dynamic disasters are usually difficult to observe directly, physical similarity simulation of coal and gas outburst has become an important method for collecting
Sijie YANG, Yang LEI, Yuanping CHENG
core +1 more source
Dianci bileiqi, 2020 依据气体放电管与TSS配合使用原理,借助电力试验研究院雷电流冲击平台,采用组合波发生器（8/20μs,1. 2/50μs）对气体放电管和TSS的配合使用电路进行冲击试验。主要研究级间电阻对气体放电管和TSS管通流、残压影响的变化趋势,以及不同型号TSS管对气体放电管和TSS管通流、残压的影响。研究得出:TSS管通流随着级间阻值的增加而减小,而GDT通流与电阻无关;同时得出不同型号TSS管对气体放电管和TSS管通流没有影响,且TSS管压越大,TSS残压值越大,GDT的残压随冲击电压总体呈逐渐上升趋势 ...
宁超, 杨俊, 纪云龙, 杨静
doaj
Gaoya dianqi, 2023 GIS、电力变压器等高压电气设备在实际运行中会不可避免地遭受操作过电压与雷电过电压，交流与冲击过电压共同作用下将严重威胁设备的绝缘性能。为了研究交流—冲击叠加电压下电气设备绝缘缺陷的局部放电特性，研制了一套交流—冲击叠加电压试验平台，并提出了试验回路中各元器件参数的设计分析方法与理论计算模型。理论计算结合电路仿真合理地设计选取了保护元器件类型及参数，有效地避免了两种电压叠加过程中对试验设备的损坏。试验与仿真结果表明，该试验平台可以产生叠加相位可控、可调的交流—操作冲击叠加电压、交流—雷电冲击叠加电压。
顾朝敏 +5 more
doaj
Dust generation characteristics during the wet-mix shotcrete process in mines and the preparation of a composite dust-reducing additive [PDF]
The dust pollution during the wet-mix shotcrete process in mines constitutes a crucial factor limiting the efficiency, cleanliness, and safety of wet-mix shotcrete support projects.
Cong LI +4 more
core +1 more source
Characterization of explosion propagation of coal dust deposited by gas explosion convolutions in closed pipelines [PDF]
To explore the propagation characteristics of gas explosion-induced coal dust detonations in enclosed pipelines, a custom-developed experimental system was employed for gas explosions involving accumulated coal dust.
Binghui YANG +6 more
core +1 more source
Gaoya dianqi, 2020 GIS在开关分闸后母线上会存在幅值较高的残余直流电压,由于GIS中电荷泄漏较慢,残余直流电压可持续作用较长时间。当再一次合GIS母线时,母线上可能会出现冲击过电压,冲击过电压会与母线残余直流电压叠加,使GIS处于直流叠加冲击电压的作用下。近年来国内多起GIS击穿事故发生于开关合闸瞬间,因此有必要对直流叠加冲击电压下GIS的放电特性进行研究。首先介绍了直流叠加冲击电压下稍不均匀电场和极不均匀电场中SF6气体间隙的放电特性和放电机理,以及直流叠加冲击电压下自由金属微粒引起的气体间隙放电特性 ...
傅中 +4 more
doaj
Dianci bileiqi, 2020 对整只避雷器多波形冲击电流试验设备参数和整只避雷器电气参数进行计算,分析了整只避雷器冲击电流试验设备回路参数的选择对回路设计的影响,提出了一种多功能冲击电流试验设备的设计思路,按此思路研制出了一种整只避雷器试验用多波形冲击电流试验设备,该试验设备可以按标准要求进行35 kV及以下电压等级避雷器的4/10冲击电流耐受试验、8/20冲击电流波形下重复转移电荷试验以及残压试验、（200～230）μs波形下重复转移电荷试验、30/80操作冲击电流残压试验。
孙泉, 余龙龙, 刘云蔚, 田泽群
doaj
Research and development on life ball system for mine disaster rescue [PDF]
, 2006 设计了一个矿难救险设施。介绍了生命球的系统组成、结构、受力分析及仿真和生命球与地面连通的整体系统。通过相关的仿真模拟,证明了该设计结构的合理性和可行性。福建省自然科学基金资助项目 ...
姚斌 +4 more
core