Underground » Detection and Prevention of Fires and Explosions
This report presents the results of a survey into operational practices affecting the safe use and testing of high voltage trailing cables (HVTC). Recommendations are made for the research into new techniques for prooftesting HVTCs in potentially hazardous environments. Additional recommendations are made for the further development of existing protection devices to store historical trends of insulation degradation manifested as leakage current. The methods of dealing with faulted cables is discussed.
The authors have studied the previous and recent practice associated with HVTCs with respect to partial discharge. A detailed insight into the conditions of the HVTCs was obtained by monitoring the level of internal dissipation occurring.
Further study is required to develop an understanding of the characteristic wave shape(s) associated with partial discharge activity in ethylene propylene rubber insulted HVTCs, with a ; view to developing in circuit, in mine HVTC monitoring/testing equipment.