2002 Vol. 28, No. 3

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Cover Catalogue
Reactive Compensation Device for Comprehensive Mining Working Face with High Productivity and Efficiency
WANG Jin-quan, QIU Li-ke, SONG Feng, WANG Tai-hui, LIU Wen-wei
2002, 28(3): 1-3.
<Abstract>(50)
Abstract:
On the basis of analyzing the power supply of comprehensive mining working face with high productivity and efficiency in Xinglongzhuang coal mine, a kind of mine used flame proof high voltage reactive compensation device is designed. According to the changes of reactive power and voltage of the power system in working face, the device can automatically switch the capacitor bank in order to increase the power factor, improve power supply and save energy.
Application of RS-485 Bus in Multi-microcomputer Communication System
HUO Zheng-long
2002, 28(3): 4-6.
<Abstract>(34)
Abstract:
The paper briefly introduced the RS-485 Bus standard and analyzed the main factors which influences the communication reliability of RS-485 Bus, then offered some corresponding solution methods and discussed some other problems which should be paid attention for when applying RS-485 Bus in multi microcomputer communication system.
Study of Computer Evaluation on Intrinsic Safety Circuit
SHANG Li-qu
2002, 28(3): 6-8.
<Abstract>(26)
Abstract:
Based on theoretical analysis of intrinsic safety circuit, a computer evaluation software of intrinsic safety circuit is programmed by using VB. The software can evaluate the real circuit effectively.
Analysis of Harmonics of AC Regulated Power Supply and Its Influence on the Measurement of Electric Parameters
SHI Chao, REN Zi-hui, CHEN Gui-zhen
2002, 28(3): 9-11.
<Abstract>(50)
Abstract:
In order to find the reason which causes some exceptional problems in the measurement of electric parameters in circuit experiment, some measured data are presented, which reveal that the harmonics of AC regulated power supply and the capacitor in parallel are the key reasons. The methods to resolve the problem are proposed.
Pseudon-random Code of Direct-sequence Spread-spectrum Commnunication System
WU Ming-jie, MA Jing-lan, WANG Wei
2002, 28(3): 11-14.
<Abstract>(40)
Abstract:
Spectra expanding of Spread spectrum communication system makes use of the spread spectrum function to realize, the typical spread spectrum function is pseudo random sequence code. This paper popularly introduces the principle, property and conforming method of the random code. It also introduces the method of obtaining, calculating and making up set volume by using computer from igional multionmial and recursion formula. The simple methode is convenient for engineering personel to refer to.
STATCOM Controller Based on SA4828 PWM Signal Generator
ZHANG Min, SHENG Hong-yuan, WANG Jing
2002, 28(3): 15-17.
<Abstract>(50)
Abstract:
The paper presents a circuit structure and control methods of controller of STATCOM based on SA4828 PWM signal generator. The simulation shows the controller can make fast responding and Less THD(Total Harmonic Distortion).
A High Performance ADC and Its Applicaiton in Mine Monitoring and Control System
SUN Ji-ping, SU You-ping, ZHAO Rui
2002, 28(3): 17-19.
<Abstract>(81)
Abstract:
Study on Leakage Protection in Coal Preparation Plants
FAN Shun-yao , FU Jin-shi , NIU Shi-wei
2002, 28(3): 19-21.
<Abstract>(34)
Abstract:
In the basis of detailed analysis of leakage equipments of coal preparation plant with 660V, this paper puts out a principle of a new intelligent leakage protection system using single chip microcomputer. It also presents the idiographic design of relating hardware circuit and software block diagram.
Principle Analysis of Leakage Protection with DC Natural Selectio
TANG Xiang, ZHANG Wen-hai, SONG Lian-qi
2002, 28(3): 22-23.
<Abstract>(30)
Abstract:
Development of Three-tirer Database
WANG Er-lin, XU Shi-xi
2002, 28(3): 24-26.
<Abstract>(21)
Abstract:
This paper mainly compares the advantages and shortages of two tier and three tire database system, it also introduces the development and application of the three tirer database system.
The SIEMAG Hydraulic Braking System of Mine Hoist
SHENG Tuan-xiu, FENG Sheng-cheng, BAI Hong-feng
2002, 28(3): 26-28.
<Abstract>(45)
Abstract:
The structure, functions, work principle and main characteristics of the SIEMAG hydraulic braking system of shaft hoist are introduced in this paper. A performances comparasion with the hydraulic braking system of JK hoist in the adjustable pressure brake unit, the safe brake, the brake examination of butterfly spring and the wear examination of brake shoe is made. Practice has certified that the system has steady performance, high reliability and less maintaining work.
Expert-PID Control of Main Pipe Pressure of Recycled Coal Gas
WANG Xue-wu, TAN De-jian, CHEN Er-kui, HAO Rong
2002, 28(3): 29-31.
<Abstract>(61)
Abstract:
According to the character of the pressure of recycled coal gas and the technological requirements of the heating system of coke oven, expert PID control method was applied to control the main pipe pressure of recycled coal gas. The results show feasibility and efficiency of the method.
Error-tolerant Technique and Its Application in NT Network Server
LI Lai-jin, QIAN Jian-xu
2002, 28(3): 31-33.
<Abstract>(19)
Abstract:
Application of PLC in Signal and Comprehensive Protection System of Service Hoist
YAN Guang, WANG Gong-hua, LI Zhao-feng
2002, 28(3): 34-36.
<Abstract>(25)
Abstract:
Application of PLC in Control System of Pretreatment Device of Steel
WU Yu-min, HU Yu-xia
2002, 28(3): 36-38.
<Abstract>(32)
Abstract:
The Study of Ultrasonic Detector
LU Shi-kui, XING Jing-fu, DENG Xiao-yu
2002, 28(3): 39-41.
<Abstract>(70)
Abstract:
Application of Automatic Mine-car Cleaner
ZHANG Yi-jie
2002, 28(3): 42-42.
<Abstract>(20)
Abstract:
Surface Centralized and Remote Control System for Underground Belt Conveyor
WANG Hui-zhong, WANG Shu-sheng, FEI Yun-he, HAO Rong, WANG Su-chuan, TAN De-jian
2002, 28(3): 43-45.
<Abstract>(28)
Abstract:
In accordance with the characteristics of transportation system of underground belt conveyor such as long line, multiple stations and communication links, using DCS system and redundancy technique, the control system of “surface control is major, underground monitoring and control is assistant” have been carried out in the Xingrongzhuang coal mine. This system runs with high safety and reliability.
Harmonic Wave of Mine Power Supply System and Its Comprehensive Treatment
LI Si-yi
2002, 28(3): 45-48.
<Abstract>(29)
Abstract:
The paper analysed the causes of harmonic wave, harmonic wave source and its danger to the electric equipments and power supply network, indicated the effective method to control harmonic wave, and reasonable installation of compensation filter device for harmonic wave.
Design and Realization of Management and Information System for Coal Sale Based on C/S Structure
FU Yan , WANG Jun , GAO Jian-xin
2002, 28(3): 48-50.
<Abstract>(28)
Abstract:
Management Information System(MIS) for coal sale based on C/S structure are designed and realized, and the functions of each section of the system are analyzed. The practice demonstrates the validity of the system.
The Probe on Application Technology of Speed Regulating with Frequency Conversion in Hi-voltage and Hi-power Asynchronous Motor
DU Jing-yi
2002, 28(3): 51-52.
<Abstract>(38)
Abstract:
Transform of Communication Network of Surface-underground in Changcun Coal Mine
DONG Jian-ming
2002, 28(3): 53-55.
<Abstract>(48)
Abstract:
The Communication of Long Distance Based on Single-chip Microcomputer
XU Yu-ming
2002, 28(3): 55-57.
<Abstract>(32)
Abstract:
This paper introduced an interface between single chip microcomputer and modem, initialization, data chain building up, data transmission regulation and hanging up operation, and gave a sending thinking of communication program based on MCS 51 single chip microcomputer in long distance.
Solution Scheme of Arc Short Circuit of Grounding of 660V Power Supply System in Coal Preparation Plants
XU Xiang-dong, HOU Qiu-hong
2002, 28(3): 58-58.
<Abstract>(25)
Abstract:
Add A Capacitor to Reference Potention Wire to Increase Reliability of Electronic System
TAO An-li, WANG Xia, NIN Zeng-jin, GUO Hong-li
2002, 28(3): 59-59.
<Abstract>(33)
Abstract:
The Research and Realization of Topology Monitoring for Campus Network
FENG Hong-qi, SHI Gou-dong, FU Yan-wei, XU Xiao-hua
2002, 28(3): 60-62.
<Abstract>(21)
Abstract:
With the development of campus network, it is important for us to manage the campus network. The discovery and monitoring of the network topology are the foundation of network fault management and security management. Through TCP/IP and ICMP Protocol, we can monitor the IP node. Compared with the binding IP and MAC address, we can check if the IP address is valid. In addition we can monitor the fault of campus network servers.

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