Off-grid mine power supply solution

Many remote mining areas are far from stable power grid access points. Even if they are connected to the mains power, they may still encounter frequent power outages, power cuts or voltage fluctuations. The on-site crushing, conveying, pumping stations, maintenance workshops and accommodation camps all rely on continuous power supply, and a single voltage abnormality may affect the rhythm of the entire site.

If the generator is only used as a single point backup on site and lacks main power supply range, ATS switching logic and load zoning, production load, domestic load and safety load will easily drag each other down in the same power grid fluctuation.

The most obvious problem on site is not the lack of a generator, but the lack of a power supply system that can prioritize loads. When the crushing line starts up, the voltage drops, and camp lighting and communications will also be affected; when the mains power is interrupted, water pumps, maintenance workshops, and camp loads scramble for spare capacity at the same time.

Onsite personnel can only rely on manual switching and temporary shutdown of some equipment to maintain operation. Every time there is a power outage, it is necessary to re-confirm the load, arrange the startup sequence, and then wait for the equipment to stabilize. The production plan is interrupted by power problems.

The direct consequence of ignoring this problem is that crushing, conveying, drainage, workshops and camps may lose power at the same time during the same voltage fluctuation. Stopping the crushing line will affect on-shift production, stopping the drainage pump will increase the risk of water accumulation during the rainy season, and power outages in the maintenance workshop will slow down equipment recovery.

A more hidden loss is management cost. The mining team needs to repeatedly coordinate which loads are turned on first and which loads are temporarily stopped. On-site electricians deal with emergency switching for a long time. When purchasing equipment, it is also difficult to determine how big a unit to buy.

The power supply system should be upgraded from "temporary emergency during power outage" to "main power supply solution". Core configurations include containerized diesel generator sets with capacity margin, ATS automatic switching, production/camp/workshop/drainage pump load zoning, and clear start-stop and switching logic.

The focus of this design is not to simply increase the power generation capacity, but to let the system know which loads must be protected first, which loads can be delayed in starting, and which loads need to be smoothly switched back after the mains power is restored.

In the first step, collect the on-site equipment list, motor power, starting method, voltage frequency, daily operating time and altitude, and distinguish between continuous load, starting shock load and critical backup load.

The second step is to re-divide the low-voltage distribution circuits according to production areas, camp areas, maintenance workshops and drainage systems to determine the ATS switching range and key load priorities. Crusher, pump equipment and high-power workshop equipment are no longer mixed with the domestic load in the same temporary circuit.

The third step is to confirm the operating relationship between the main, backup and mains inputs. The mining team can clearly know which loads are guaranteed by the main unit, which loads need to be started in a delayed manner, and which loads will be switched back after the mains power is restored.

The target result after the transformation is that production load, camp load and critical drainage load are clearly grouped. When the mains power is unstable, the main unit can bear the core production and safety loads; after the mains power is restored, ATS and load priority are gradually switched to reduce manual emergency operations.

What the mining team received was not just a quotation for a unit, but an executable description of the power supply relationship: which loads must be prioritized, which loads need to be started with a delay, and what order should be followed when on-site operations occur during power outages, power rationing, and restoration of mains power.