Underground Substations

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Custom underground substations

We take pride in our ability to provide customised substation solutions meticulously tailored to meet the unique needs of our customers. This adaptability is made possible through a synergy of cutting-edge technology in SCADA control and the extensive expertise of our accomplished engineers.

Our range of substations offer an impressive array of choices, allowing for various combinations of input, output, and size configurations. Our mining substations are exceptionally versatile and cater to a wide spectrum of applications, including longwall operations, development projects, distribution networks, and pumping systems. Our substation units are also available in both flameproof and ingress-protected (IP66) variations, ensuring their suitability for diverse operating environments.

Our underground mining substations can be engineered and manufactured with capacities of up to an impressive 7.5MVA, featuring primary voltages that can reach as high as 22kV. This level of adaptability and performance underscores NEPEAN Power’s commitment to delivering tailored solutions that meet the exacting standards of the mining industry, ensuring efficient and reliable power distribution in even the most demanding conditions.

Transformers may be gas, liquid filled or dry type, ranging from 50kVA in various combinations of primary and secondary voltages dependent upon customer specific needs.

Skid Base
NEPEAN Power’s substation includes a skid base that by default is constructed to a very robust and proven design ensuring they are capable of being towed or pushed into position in adverse conditions. The base is usually hot dipped galvanised and can be provided with towing bollards, floating axles, removable rubber wheels and fully plated bases to provide catchments of transformer oil.

High Tension End
The high voltage end is constructed from sheet steel that has been fully folded and welded to a certified IP design. The design incorporates NEPEAN type tested arc fault containment. Safe touch potentials are maintained via separate compartments for all system voltages including operating and metering.

Low Tension End
The low voltage end fabricated from sheet steel, fully folded and welded to a certified IP rating. Construction depends on customer needs and requirements. Standard substation protection includes earth fault limitations on the star point of all secondary windings, earth leakage tripping is provided back to the high voltage circuit breaker. Each outlet can be protected by moulded case circuit breakers, fuses and or contactors, earth leakage protection, cable fault lockout protection, earth continuity, loss of vacuum, frozen contactor, overload, short circuit, with visible break isolation if specified etc.

Testing & Documentation

Each substation upon completion follows through a process of Factory Acceptance Testing, Compatibility Testing (where necessary) and Commissioning to ensure operational status on delivery. Manuals including a flameproof dossier and drawings are provided and options are available for ongoing support for each product including life cycle management.

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