Results 21 to 30 of about 2,827 (237)

Optimization Design of Intrinsic Safety Pilot Circuit for Motor Remote Start and Stop

Meikuang Anquan, 2020
This paper introduces the types of remote starting and stopping pilot circuits of existing motors, the existence of mis-starting, the inability to identify all line faults and the unstable operation of power supply voltage reduction, and proposes an ...
ZHANG Yuxiang, SONG Jiancheng, TIAN Muqin
doaj   +2 more sources

Coal mine intelligent information comprehensive carrier network

Gong-kuang zidonghua, 2022
At present, the information carrier network used in coal mine is mainly 100 Megabit, Gigabit and 10 Gigabit mining Ethernet ring network. The time delay and reliability of the network are uncontrollable.
SUN Jiping, CHENG Jiamin
doaj   +2 more sources

Revision amendments of AQ 6201 General Technical Requirements of Coal Mine Safety Monitoring System

Gong-kuang zidonghua, 2016
In order to further play role of coal mine safety monitoring system in gas control, AQ 6201-2006 General Technical Requirements of Coal Mine Safety Monitoring System should be amended.
SUN Jiping
doaj   +2 more sources

Design of an Environment Monitoring and Control Device of Mined-used Lifesaving Cabi

Gong-kuang zidonghua, 2011
In view of problems of bad coordination existed in current environment monitoring and control device of mine-used lifesaving cabin in China, the paper proposed a new type of design scheme of environment monitoring and control device of mine-used ...
ZHANG Li-bi
doaj   +1 more source

Design Requirements of Mine-used Wireless Methane Sensor

Gong-kuang zidonghua, 2011
The paper analyzed performance requirements of mine-used methane sensor about stability of displayed value, response time and error limit at present, pointed out battery and communication signal of mine-used wireless methane sensor should accord with ...
WANG Xiao-song, LI Xue-ze
doaj   +1 more source

Influence factors analysis of discharge characteristics of compound intrinsically-safe circuit

Gong-kuang zidonghua, 2020
Existing researches on discharge characteristics of compound intrinsically-safe circuits may be lack of mathematical analysis, or consider influence factors incompletely.
SHI Yaping
doaj   +1 more source

Several Methods of Reducing Discharge Energy for Intrinsic Safety Power Supply

Meikuang Anquan, 2020
In order to reduce the discharge spark energy of the intrinsic safety power supply, several measures are proposed in this paper. When the over-current protection occurs, DC-DC or AC-DC module should be turned off as quickly as possible, and the ...
DONG Jianguo, LI Yanmin, ZHOU Xingdong, ZHANG Lei
doaj   +1 more source

Coded excitation for low-power guided ultrasonic wave inspection in safety-critical industries: Case studies

, 2021
High-power ultrasonic non-destructive evaluation (NDE) poses significant threats to intrinsic safety. It may lead to hazards in critical industrial applications, especially in oil & gas refineries, high-energy material technologies and the aerospace ...
Jayakrishnan, S, Koodalil, D, Balasubramanian, Krishnan, Suresh, N   +3 more
core   +1 more source

Application of Wi-Fi 6 Technology in Coal Mine

Meikuang Anquan, 2020
The wireless network coverage scheme of Wi-Fi 6 in underground coal mine is designed to solve the problem that 5G communication cannot achieve the whole mine signal coverage in underground coal mine.
ZHANG Jinhao, CHEN Min
doaj   +1 more source

Analysis of influencing factors of short-circuit spark discharge in electric potential capacitance circuit

Gong-kuang zidonghua, 2020
Most of existing models and methods for research of capacitive circuit spark discharge and high-power intrinsic safety power supply only consider discharge characteristics of energy storage elements during discharge process， and do not consider influence
KANG Qian, XU Chunyu, TIAN Muqin, SONG Jiancheng   +3 more
doaj   +1 more source