ELECTRIC BLASTING SYSTEM Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: electric blasting system includes blasting machine which is connected with the help of grounded geophysical cable to connecting device manufactured in the form of matching transformer. Inductive resistance of primary winding of transformer equals wave resistance of geophysical cable. Its secondary winding is coupled electrically to primary winding of transformer unit of protection of resistance bridge of firing cartridge located in case of perforator. Inductive resistance of secondary winding of matching transformer is equal to inductive resistance of primary winding of transformer unit of protection of bridge. EFFECT: enhanced safety of performance of shooting-through operations when preparing, assembling and lowering perforator, simplified design of system and its increased reliability. 1 dwg