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BME Raises Safety Bar with High Current Detonator Testing

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BME Raises Safety Bar with High Current Detonator Testing

by Dennis Ayemba
October 6, 2022
in Press Releases
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BME Raises Safety Bar with High Current Detonator Testing
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Blasting and explosive solutions provider, BME is once again pushing the boundaries of safety with its world-class initiation system, this time testing the resistance of its AXXIS Titanium™ electronic delay detonators (EDDs) to high current AC voltages.
“There are a number of different voltages that underground mines employ for their various machinery and equipment,” said Tinus Brits, BME’s Global Product Manager – AXXIS™. “The tests we carried out with an independent research partner were able to show that the AXXIS Titanium™ EDD is very resistant to high current AC voltages.”
The Department of Minerals Resources ARP1717 certification is relevant to this aspect of blasting providing a foundation for the safety levels expected from blasting equipment, said Bennie van Nieuwenhuizen, quality manager for AXXIS™.
“In line with our innovation focus and our commitment to safety, the tests we conducted were to push the boundaries even further in the interests of safe blasting and mining,” said Van Nieuwenhuizen. “We were therefore interested in characterising the response of our detonators at far higher currents and voltages than the standards require.”
The context for these tests is that EDDs are typically deployed in mining environments where the range of energy levels is difficult to predict – as every mine will have their own preferred power supplies. In some mining applications, EDDs are used near electrical wires or electric initiation systems.
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“This gives rise to the risk that the EDDs could be exposed to high voltages and currents due to human error or equipment failure,” said Andries Posthumus, AXXIS™ product development manager. “It is therefore important that EDDs should have resistance to initiation when unintentionally exposed to high voltage and current.”
He highlighted that the AXXIS Titanium™ EDD consists of an encapsulated electronic module, with an electronic printed circuit board that is over-moulded with a plastic material in a proprietary shape. The area closest to the explosive part of the detonator forms a friction fit, as the detonator tube is tapered to the bottom. This forms a seal mechanism, isolating the electronic components from the pyro-technic head and base charge.
The testing protocol required specialised high-power inputs, so BME partnered with the National Electrical Test Facility (NETFA), said BME electronic engineer Hendrik van Niekerk.
“The tests involved a high current AC voltage source consisting of a live node, connected through a resistor to the one wire of the detonator, and the neutral node to the other wire of the detonator,” said Van Niekerk. “A remote contactor was used to start the AC exposure, while we measured the voltage with a high voltage probe and measured the current level with a current probe.”
The test levels were pushed to extreme levels not expected in normal operating conditions and in all the samples tested, no initiation occurred.
“We were pleased with the results of the tests, which showed that BME continues to operate at the highest levels of safety,” said Brits. “Our innovative approach ensures that our ongoing research and testing finds new opportunities for safe and efficient blasting.”

Tags: AXXIS Titanium™Van Nieuwenhuizen
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Dennis Ayemba

Dennis Ayemba

Jan - March 2023 Magazine

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