Results 21 to 30 of about 11,854 (255)

Design of mine-used power supply with super wide input voltage range

Gong-kuang zidonghua, 2016
For problems of existing mine-used flameproof and intrinsically safe type power supply with multiple input voltage level such as large voltage fluctuation, heavy weight and difficult maintenance, a design scheme of mine-used power supply with super wide ...
LIU Yahui
doaj   +1 more source

Design of novel intrinsically safe power supply with 'ia' grade

Gong-kuang zidonghua, 2017
According to working condition of mine-used power supply in coal mine underground, novel intrinsically safe power supply with 'ia' grade was designed. The power supply uses a fully enclosed AC-DC module to eliminate special flameproof enclosure, and has ...
YU Zhixue, FANG Xupeng, ZHAO Yang
doaj   +1 more source

Study of large capacity power supply used for coal mine emergency facilities

Gong-kuang zidonghua, 2014
In view of problem that common accumulators used in underground coal mine have obvious constraints, the paper analyzed electricity demands of coal mine emergency facilities and characteristics of dry-charged lead-acid battery, developed large capacity ...
LI Meixiang, ZHOU Zhong, ZHANG Yong
doaj   +1 more source

Design of Coal Mine Power Supply Monitoring System [PDF]

Proceedings of the 2nd International Conference on Electronics, Network and Computer Engineering (ICENCE 2016), 2016
According to the characteristics and the management pattern of coal enterprises production and supply, this paper designs a kind of mine power supply monitoring system. The system can carry out real-time monitoring, measurement, protection and control for mine power equipment, the realization of underground high, low-voltage power supply devices can be
Jun Xu, Guo Jin, Lei Shi
openaire   +1 more source

On-line relay protection setting system for mine power grid considering multi-scenario operation mode

Gong-kuang zidonghua, 2020
Although the existing research on mine power grid relay protection setting has studied the setting methods of mine power grid relay protection under different operation modes, but it has not studied the setting method that applied in the automation ...
YU Qun, LIU Jiayu
doaj   +1 more source

Setting strategy of instantaneous current quick-breaking protection for mine power grid

Gong-kuang zidonghua, 2023
The mine power grid operating environment is poor. When a short circuit fault occurs in the underground power supply system, the use of complex anti-skip trip protection device will reduce the reliability of the entire power grid and increase the cost ...
YU Qun, CUI Guoliang, GU Feng, LIU Tao
doaj   +1 more source

Anti-override trip monitoring system of coal mine power supply

Gong-kuang zidonghua, 2018
Main causes of override trip accident of coal mine power supply system were analyzed, which included short circuit, leakage, voltage fluctuation, switch operation rejection, etc. Both advantages and disadvantages of existing anti-override trip methods of
ZHANG Wenrui
doaj   +1 more source

Application of electric spring in coal mine power supply [PDF]

, 2020
Abstract With the continuous improvement of mine automation, coal mines have higher and higher requirements for the quality of power supply voltage, and voltage fluctuations have become one of the factors that threaten the safe operation of coal mines.
Xi Zhang, Zheng Zheng
openaire   +1 more source

Central Nervous System Neuroblastoma, FOXR2‐Activated: A Pooled Analysis of Published Clinical Outcomes

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Central nervous system (CNS) neuroblastoma, FOXR2‐activated, is a recently recognized entity in the WHO CNS5 classification, defined by activation of the FOXR2 transcription factor and unique histopathological features. This review synthesizes available literature and pooled clinical data, providing insight into demographics ...
Sudarshawn Damodharan, Mohamed S. Abdelbaki   +1 more
wiley   +1 more source

Application of three kinds of power source emergency local fan in mine heading face

Meikuang Anquan, 2022
In order to prevent the occurrence of gas over-limit accident in coal mine heading face due to local fan stopping, on the basis of the original “double fans and double power supply” of local fan in heading face, from the point of view of improving the ...
SUN Yanjun
doaj   +1 more source