Pak Thae Un, a section head at Faculty of Mining Engineering, studied and introduced a simultaneous blasting method by a high-voltage blaster whereby they could improve rock cutting property by enhancing the effects of simultaneous blasting in blasting operations.
They applied voltage of over 150v to each electric igniter linked to tens of detonators connected in series in the blasting circuit network with a high-voltage blaster generating high voltage impulse in order to cause discharge explosion effect, thus reducing the average detonation time to 4.7±1ms.
It resulted in the improvement in the effects of simultaneous blasting of blasting hole charges, which meant far more improvement in rock cutting property.
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