In order to avoid relay settings from being a hidden failure source,an idea of relay settings examination and rectification is proposed and a software for relay settings examination and rectification is developed.

Feasibility study on the program of eliminating potential accident at veinlet belt orebady of Tongkeng mine;

Safety assessment of potential accidents at large metal mine dump

Based on the storage tank farm investigation about its compoments; characteristics of chemicals; hazards and its current status, this paper analyzes the investigation results using accident hazards analysis theory, and offers the countermeasures according to 10 principals of hazards treatment.

In this paper the event hidden trouble scope and the utilization limitation concerning the present prevention measures is analyzed in detail.

This paper introduces the present situation of the power supply system of preparatory substation in coal washery of Tunlan Coal Mine, analyses the reasons why the hidden peril of the accident exists, and puts forward some debugging methods.

Based on discussion on several common elevator door lock circuits with software,this paper points out some hidden peril of the accident in such circuits,and designs a circuit using PLC.