Overview:
- Characterized by large machines
- Largest machines for excavating, overburden removal, ore transport and crushing: draglines, shovels, winders, conveyers and mills
- Local ore processing may require pumps and compressors of relatively large ratings
- Providing a supply of electricity to large mining machines is always challenging
- These challenges are mainly due to their load cycle and are compounded by the relatively small, geographically separate electricity supply systems
- Dynamic interaction between generators and motors requires knowledge of the limits of generators’ capability
- Remote location of mining operations is challenging, even if the supply can be provided from the grid via a high voltage interconnection
Characteristics:
- Relatively small number of very large loads – mining machines
- Largest machines generally electrically powered
- Very small % of general loads (camp, canteen, administration, township) in the total load
- No ‘natural’ load growth
- Step load changes due to mine expansions
- Remote locations, impact of climate and wildlife
- 24 hours’ operation – ‘flat’ load profile
- Load swings of largest machines (shovels, draglines, winders, …) important
- Machines often regenerate in one part of their duty cycle
- Large % of motor loads
- Motor fault current contribution significant
- Large % of motor loads connected via power converters (VV & VVVF drives)
- Harmonics current injection significant
- Load swings of active (MW) and reactive (MVAr) power during one duty cycle or motor starting are large relative to the capacity of the supply power system
- Additional stress on local generators if they are: – located in isolated power systems – of different sizes and characteristics – there is no or little intentional spinning reserve
Solutions:
MHS Solutions are available for Mining Industry -
- Fuel flexible Option of Diesel, HFO Generator from smallest capacity of 15KVA to 2000KVA& in multimegawats.
- HV/ LV Genset ranging voltage from 33kv to 230 V
- Mobile Lighting Tower mostly required in Open Cast Mines.
- Emergency & Technical Support
- Fuel Management services
- All statutory approvals including DGMS
- 100% Compliance Management.
