scholarly journals Study and Practice on Distinctive Characteristics of Mechanical and Electrical Equipment Maintenance and Management Major in Guangzhou Railway Polytechnic

2020 ◽  
Author(s):  
Ḥafṣa Azalea Azra
Keyword(s):  
Electrical Equipment ◽  
Teaching Quality ◽  
Main Line ◽  
Rail Transit ◽  
Equipment Maintenance ◽  
Construction Process ◽  
Industrial Chain ◽  
Software And Hardware

The construction of specialty characteristics shall start from the overall characteristics of the school, take the specialty group as the perspective, find the characteristic construction direction in the whole industrial chain, and improve the connotation of specialty. To promote the development of the specialty of mechanical and electrical equipment maintenance and management in domestic polytechnics, taking the construction process of this specialty in Guangzhou Railway polytechnic as an example, it was discussed on why and how to carry out the construction of major characteristics with the main line of the equipment maintenance of rail transit stations and train vehicle repair plants. Aspects were discussed including the establishment of curriculum system, the construction of specialty teachers’ team, the construction of teaching software and hardware resources and the monitoring of teaching quality. The results can be used for reference in the construction of similar specialties in China.

Study on the Countermeasures of Aviation Equipment Maintenance Knowledge Management

2013 ◽  
Vol 834-836 ◽  
pp. 2033-2036
Author(s):  
Li Zhi Xiao ◽  
Yue Shan Cui ◽  
Xiao Kun Wang ◽  
Ji Bao Liu ◽  
Xiao Bin Xu
Keyword(s):  
Knowledge Management ◽  
Main Line ◽  
Equipment Maintenance

From the concept of knowledge management, this paper points out the importance of aviation equipment maintenance knowledge management. Specific countermeasures are presented by the three elements of knowledge management which are personnel, organization and technology as the main line.

Arc Flash Hazard Analysis in Traction Power Substations

2009 ◽  
Author(s):  
Kinh D. Pham ◽  
Robert Jones
Keyword(s):  
Hazard Analysis ◽  
Short Circuit ◽  
Electrical Equipment ◽  
Rail Transit ◽  
Arcing Faults ◽  
Insulation Failure ◽  
Arc Flash ◽  
Transit Agencies ◽  
Ionized Air ◽  
Dc Arc

Arc flash hazards can result from accidents or equipment deterioration such as dropping tools, accidental contact with electrical equipment, build up of conductive dust, corrosion, condensation, over-voltage stress, or insulation failure. An arc is produced when electric current passes through ionized air after an initial flash over or short circuit, resulting in a flash that could produce significant heat, with temperature in excess of 35,000°F. The extremely high temperature of an electric arc can cause major burns within ten feet and fatal burns within five feet of an arc flash. Recently enacted guidelines and regulations by OSHA and NFPA 70E regarding arc flash hazards have compelled many rail transit agencies to require that an arc flash hazard analysis be performed. The purpose of this analysis is to determine the potential risk of arc faults at every switchgear and electrical panel board to which a worker may be exposed. To comply with OSHA and NFPA, appropriate work practices and personal protective equipment (PPE) must be utilized to reduce the risks associated with arc flashes. Several methods for calculating the arc-flash hazard have been developed. This paper will examine and discuss the following three methods: a) the Ralph H. Lee’s theoretical model, b) the NFPA 70E equations and tables, and c) the IEEE Std 1584 methods. None of the above methods addresses arcing faults in DC switchgear. To date, there is no written standard for DC arc flash hazard analysis. DC arcing faults and calculation methods are discussed. Sample arc flash hazard analysis from a recent rail transit project is included.

scholarly journals Determination of conditions for frequency adjustment of maintenance (M) and routine repair (RR) of electrical equipment under risk-oriented strategy of technical operation

2020 ◽  
Vol 222 ◽  
pp. 01014
Author(s):  
V.A. Trushkin ◽  
S.V. Schlyupikov ◽  
O.N. Churlyaeva ◽  
A.S. Guzachev
Keyword(s):  
Agricultural Production ◽  
Information Technologies ◽  
Electrical Equipment ◽  
Equipment Maintenance ◽  
Widespread Application ◽  
Maintenance And Repair ◽  
Repair Strategy ◽  
Frequency Adjustment ◽  
Technical Operation

Currently, in order to ensure the required fault-proof level of technological processes in agricultural production, the following strategies among the main ones: afterfailure, planned systematic and a mixed electrical equipment maintenance and repair strategy. The pervasion of information technology in this segment was not widespread. Application of information technologies in conjunction with implementation of risk-oriented strategy is one of the promising directions of electrical equipment maintenance optimization, yet requires adaptation to sectoral characteristics of agricultural production. The article describes the problem of determining the optimal conditions for adjusting the frequency of maintenance and repair of electrical equipment on the basis of risk-oriented approach. To solve this problem, the equation of annual costs for maintenance and repair of electrical equipment was drawn up taking into account the parameter of its failure risk. The relationship between the change of relative risk and the service frequency was established; based on it, the ranges of frequency adjustment of maintenance and ongoing repair were determined.

Study on the Effect of Resistance Sliding Key Chamber Blasting Construction of a Hydropower Station on Adjacent Buildings

2012 ◽  
Vol 594-597 ◽  
pp. 2773-2776
Author(s):  
Hua Feng Deng ◽  
Qian Luo ◽  
Xian Fan Yuan ◽  
Min Zhu
Keyword(s):  
Electrical Equipment ◽  
Blasting Vibration ◽  
Construction Process ◽  
Velocity Range ◽  
Time Analysis ◽  
Monitoring Point ◽  
Adjacent Buildings ◽  
Real Time Analysis ◽  
Point Scheme ◽  
And Control

In order to monitor and control the effect of blasting vibration on dam body, spillway overflow surface and mechanical and electrical equipment foundation at the excavation of resistance sliding key chamber, the fixed monitoring point scheme was used to monitor vibration speed of each point. According to the construction progress, a total of 44 times blasting vibration test were carried on, and data are integrity, which can accurately reflect the effect of resistance sliding key chamber excavation blasting on adjacent buildings. In blasting construction process, according to the analysis of monitoring data, the explosive dosage of single stage was adjusted, which effectively control the effect of blasting vibration. The results indicate that, in the process of resistance sliding key chamber blasting construction, particle vibration velocities of adjacent buildings such as dam body, spillway overflow surface, mechanical and electrical equipment foundation and etc. are in the velocity range of security vibration, which meets the requirements of design and specification, and real-time analysis of field monitoring guarantees the smooth completion of site construction.

The Research of Flexible Testing System

2013 ◽  
Vol 756-759 ◽  
pp. 701-704
Author(s):  
Gang Niu ◽  
Guo Shun Chen ◽  
Wen Bin Cao ◽  
Ya Jun Zhang ◽  
Wen Ya Bai
Keyword(s):  
Detection System ◽  
Hardware Design ◽  
Test System ◽  
Testing System ◽  
Equipment Maintenance ◽  
Signal Conditioning ◽  
The Core ◽  
Flexible Technology ◽  
Software And Hardware ◽  
Design Ideas

For the purpose of solving the problems, such as many kinds of C3I equipment signals to be test, complicated technology and technology fast updates, a test system based on flexible technology is proposed. In this system, the core technical cocept of systematize and developmental design is adopt. In this paper, the design ideas, software and hardware design and test diagnosis process are described in detail. The detection system based on flexible test achieves calling testing resources according to the different objects, interfaces conversion and signal conditioning. The system has good characteristics on flexibility, reliability, adaptability and expand [1-, which is of great significance for the equipment maintenance and support.

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