December 2003Electrical Power & Protection
Surveillance
According to various surveys undertaken by Surge Technology, many mine engineers countrywide still believe that lightning is an 'act of God' that cannot be safeguarded against. Even today, some mines still utilise antiquated devices that do not meet SANS (SABS) specifications. The SABS requirements state that all three phases plus neutral earth must be protected, and it is interesting to note that certain devices do not protect the neutral line.
Mines are dependent on computers and associated electronics for all aspects of production, processing and administration, as are most other industries. If a single lightning strike is allowed to enter this computerised network, the hardware costs incurred can be astronomical, and the associated downtime can add up to R-millions in lost revenue. It is estimated that lightning protection costs 30% of the average loss in hardware caused by a single lightning bolt. Protection must be an integrated network covering both data lines and power supplies to be fully effective.
In addition, all instrumentation such as flowmeters, temperature sensors, PLCs, time and attendance systems and weighbridges are susceptible to lightning damage and must be protected accordingly.
Time-keeping systems are one of the most problematic when affected by lightning. If these malfunction, workers can be denied access into certain areas, resulting in loss of production and inaccurate reports on the time personnel have worked.
As each project is unique, Surge Technology offers consultations on the correct products to use, as well as an earthing service. Products are available to reliably protect each aspect of production through to the product leaving the mine.
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