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paper on power factor control in coal mines

Improvement of Power Quality in Underground Coal Mines ...

coal mining is an efficient mining method that can extract a high percentage of coal from a seam. In a Longwall coal mine, two long, horizontal and permanent tunnels known as gate-roads are cut into a coal seam to form the boundaries for a large rectangular block of coal, known as a Longwall panel [1].

Coal Mine Voltage Fluctuation Analysis and Control ...

Reasonable allocation reactive power compensation devices in coal mine system can not only develop power factor, it can also solve bus voltage fluctuation problem of coal mine system. By analyzing load characteristic in coal mine system, non-linear impulse load and induction motor can cause bus voltage fluctuation. The characteristic of SVC is that its response speed is quick and it can be ...

Design of a Novel Underground Coal Mine 127V Power Supply ...

In view of the current disadvantages of the large size, high cost and low power factor of custom transformers in China’s coal mine 127V power supply system, a novel type of unit-power factor rectifier based on OCC (One-Cycle Control) is proposed to supply the underground coal mine lighting system. The power supply consists of three stages, including a Vienna rectifier, a high frequency ...

A calculation model of coal mine safety management based ...

A reasonable coal mine safety control model is very important for coal mine safety management. In this paper, a calculation model of coal mine safety management is researches based on Kalman filtering algorithm. Unlike traditional regression analysis, this model is

Improving the Thermal Efficiency of Coal-Fired Power ...

Paper 1805-2014 Improving the Thermal Efficiency of Coal-Fired Power Plants: A Data Mining Approach Thanrawee Phurithititanapong and Jongsawas Chongwatpol ... key factor to measure the overall efficiency of the plant. - For the combustion process in a coal-fired power plant, the opacity of the flue gas exhaust emissions ...

Design of a Novel Underground Coal Mine 127V Power Supply ...

In view of the current disadvantages of the large size, high cost and low power factor of custom transformers in China’s coal mine 127V power supply system, a novel type of unit-power factor rectifier based on OCC (One-Cycle Control) is proposed to supply the underground coal mine lighting system. The power supply consists of three stages, including a Vienna rectifier, a high frequency ...

Coal Mine Voltage Fluctuation Analysis and Control ...

Reasonable allocation reactive power compensation devices in coal mine system can not only develop power factor, it can also solve bus voltage fluctuation problem of coal mine system. By analyzing load characteristic in coal mine system, non-linear impulse load and induction motor can cause bus voltage fluctuation. The characteristic of SVC is that its response speed is quick and it can be ...

Design Of Underground Coal Mine Monitoring System

This paper proposes a mine safety monitoring system based on ARM7 and ZigBee to achieve the ... fatalities in underground coal mine explosions in which methane was a contributing factor. Moreover ... functions to be implemented in standard low-power logic, and these control signals facilitate the

Toward Pillar Design to Prevent Collapse of Room-and ...

Figure 1.—Mine layout for coal mine collapse 1 (Chase et al. 1994) Many case histories exist of CPF in coal mines. The most infamous example is the Coalbrooke Colliery in South Africa where 437 miners perished when 2 km2 of the mine collapsed within a few minutes on January 21, 1960 (Bryan et al., 1964). During the 1990’s, U.S. coal mines ...

Data Acquisition and Remote Control Systems in Coal Mines ...

coal mines. This paper presents the solution regarding CIS implemented in Serbian underground coal mines. The paper is organized as follows. In this ‘Introduction’ section, the importance of the development of control devices (CDs) and CISs in underground coal mines is described. The ‘Methodology’ section describes the measurement of

(PDF) Coal Mine Safety Monitoring and Alerting System ...

[8] Pranjal Hazarika, implementation of safety helmet for Zigbee wireless system is chosen because it is low power, coal mine workers , 1st IEEE International Conference low cost, low maintenance monitoring and control system. on Power Electronics Intelligent Control and Energy Its signals are able to penetrate walls and work very well in ...

Rock fragmentation control in opencast blasting ...

Apr 01, 2016  Presently, seams R-V and R-VI are being extracted by opencast method of mining. The mine is producing about 4.5 Mt of coal and removal of overburden is about 12 Mm 3. The stripping ratio of the mine is 1:4.72, i.e. 4.72 m 3 of overburden is to be removed for mining of 1 t of coal. The total coal reserve of the mine is 188.26 Mt.

Most Downloaded International Journal of Mining Science ...

CiteScore: 6.7 ℹ CiteScore: 2020: 6.7 CiteScore measures the average citations received per peer-reviewed document published in this title. CiteScore values are based on citation counts in a range of four years (e.g. 2016-2019) to peer-reviewed documents (articles, reviews, conference papers, data papers and book chapters) published in the same four calendar years, divided by the number of ...

Power Factor in Electrical Energy Management

Power factor may be billed as one of or combination of, the following: 1) A penalty for power factor below and a credit for power factor above a predetermined value, 2) An increasing penalty for decreasing power factor, 3) A charge on monthly KVAR Hours, 4) KVA demand: A straight charge is made for the maximum value of KVA used during the

Trace Elements in Soils around Coal Mines: Current ...

Jan 29, 2016  The present paper reviewed the average concentrations of trace elements in soils near coal mine areas from various cities/countries to provide a current global summary of this issue. The contamination of soils was assessed by using global reference materials and various contamination indices. The results show that the average concentrations of trace elements varied widely: As

Optimization of Blasting Parameters in opencast Mines

mines of MCL, and it can be modified with collection of information from a large number of mines. References Nanda, N.K. (2003), “Optimization of mine production system through operation research techniques”, 19 th World Mining Congress,New Delhi, November, pp.583-595. Pal Roy, P. (2005), “Terms and parameters influencing mine and ground ...

Implementation of Wireless Sensor in Coal Mine Safety ...

In this paper, a safe Coal Mine Monitoring system which ... scale factor is 0.01V/ oC. or power it with a AC Fig -3: Gas Sensor Module 2) Gas sensors: ... Relays are also used where it is necessary to control a circuit by a separate low-power signal, or where several circuits

Coal Mining - Ampcontrol

As an industry leader in electrical, electronic and control solutions, we consistently ensure our products and services meet the expectations of our coal mining customers in terms of safety, technical excellence and reliability. We partner with our customers, working through the design and application challenges unique to their mining operation.

OPEN CAST MINE PLANNING - Mining and Blasting

= (Solid productivity of dragline engaged in exposing coal (million Cum))/ (cross sectional area of volume which is handled by the dragline engaged in exposing coal (square meter)) W = cut width (m) H = height of the coal seam (m) g = specific gravity of coal MF = mining factor (for rib and other operational losses) = 0.9 BF = band factor

Coal Mine Voltage Fluctuation Analysis and Control ...

Reasonable allocation reactive power compensation devices in coal mine system can not only develop power factor, it can also solve bus voltage fluctuation problem of coal mine system. By analyzing load characteristic in coal mine system, non-linear impulse load and induction motor can cause bus voltage fluctuation. The characteristic of SVC is that its response speed is quick and it can be ...

Design of a Novel Underground Coal Mine 127V Power Supply ...

In view of the current disadvantages of the large size, high cost and low power factor of custom transformers in China’s coal mine 127V power supply system, a novel type of unit-power factor rectifier based on OCC (One-Cycle Control) is proposed to supply the underground coal mine lighting system. The power supply consists of three stages, including a Vienna rectifier, a high frequency ...

Design Of Underground Coal Mine Monitoring System

This paper proposes a mine safety monitoring system based on ARM7 and ZigBee to achieve the ... fatalities in underground coal mine explosions in which methane was a contributing factor. Moreover ... functions to be implemented in standard low-power logic, and these control signals facilitate the

Implementation of Wireless Sensor in Coal Mine Safety ...

In this paper, a safe Coal Mine Monitoring system which ... scale factor is 0.01V/ oC. or power it with a AC Fig -3: Gas Sensor Module 2) Gas sensors: ... Relays are also used where it is necessary to control a circuit by a separate low-power signal, or where several circuits

Toward Pillar Design to Prevent Collapse of Room-and ...

Figure 1.—Mine layout for coal mine collapse 1 (Chase et al. 1994) Many case histories exist of CPF in coal mines. The most infamous example is the Coalbrooke Colliery in South Africa where 437 miners perished when 2 km2 of the mine collapsed within a few minutes on January 21, 1960 (Bryan et al., 1964). During the 1990’s, U.S. coal mines ...

(PDF) Coal Mine Safety Monitoring and Alerting System ...

[8] Pranjal Hazarika, implementation of safety helmet for Zigbee wireless system is chosen because it is low power, coal mine workers , 1st IEEE International Conference low cost, low maintenance monitoring and control system. on Power Electronics Intelligent Control and Energy Its signals are able to penetrate walls and work very well in ...

Electrical engineer of coal mines other than underground

EXAMINATION PAPER 1 . Electrical engineer of coal mines other than underground mines certificate of ... The mine is running at a power factor of 0.65 at a recorded maximum demand of 20 MVA. a) Nominate the size of an 11kV connected capacitor bank to correct the power factor ... accessories at the mine or petroleum site, (e) the control of 10 11 ...

Coal and the Industrial Revolution, 1700-1869

advantages of steam did not appear till quite late. The haulage in even the deepest mines was still done using horse power up until at least the 1760s. Thus in the Walker colliery in 1765, the deepest mine at that point at 600 feet, coal was lifted from the mine by a

OPEN CAST MINE PLANNING - Mining and Blasting

= (Solid productivity of dragline engaged in exposing coal (million Cum))/ (cross sectional area of volume which is handled by the dragline engaged in exposing coal (square meter)) W = cut width (m) H = height of the coal seam (m) g = specific gravity of coal MF = mining factor (for rib and other operational losses) = 0.9 BF = band factor

Coal Mining - Ampcontrol

As an industry leader in electrical, electronic and control solutions, we consistently ensure our products and services meet the expectations of our coal mining customers in terms of safety, technical excellence and reliability. We partner with our customers, working through the design and application challenges unique to their mining operation.

Optimal scheduling method for belt conveyor system in coal ...

Influence factor like arrival time of trains and ramp rate of the belt speed were analyzed. Abstract. In order to reduce the high electricity cost of the belt conveyor system in a coal mine, a virtual energy storage model of the belt conveyor system is proposed based on the coal storage ability of silo. ... 1998, and 2001 respectively. He is a ...

The Indian coal sector: Challenges and future outlook

Mining in India is a major economic activity which contributes significantly to the economy of India. The GDP contribution of the mining industry varies from 2.2% to 2.5% only but going by the GDP of the total industrial sector it contributes around 10% to 11%. Coal with a proven reserve of 860 billion tonnes is mined the most in the world.

Research on TSC Type Reactive Power Compensation Control ...

As the increasing equipment of high power and motor load put into coal mine enterprise, the quality of power supply is decreasing, such as low power factor and large voltage fluctuation, etc. After analyzing the theory and algorithm of reactive power compensation in details, studying a system based on STM32 thyristor switched capacitor (TSC) reactive power compensation control system, which ...

The prevention and control of fire and explosion in mines

• Regulations 3 and 4 of The Coal Mines (Owner’s Operating Rules) Regulations 1993 require mine owners to set down in writing operating rules on a number of issues, including both mine fires and frictional ignitions of flammable gas and to notify the HSE of them.