HIMOINSA develops voltage transformer substations in 10 and 20ft containers

The HRS 6300 D5/6 and the HRS 3150 D5/6 transformer substations built by HIMOINSA, in a 20 and 10ft container version, respectively, make transformation possible by increasing the voltage of 4 generator sets connected in parallel in the same station. These substations make it possible to transform 6.3 MVA and 3.15 MVA depending on whether a 20 or a 10ft container is used.

The transformer substations make it possible to increase the voltage from low to medium, or vice versa, depending on the needs of the client in each project.

HRS 6300 D5/6

Each 20ft container is fitted with two 3,150 kVA transformers which make it the best solution for adjusting the necessary voltage in reduced spaces, thereby avoiding having to connect each generator set to individual electricity transformers which would require much more installation work, not to mention space. The engineering team at HIMOINSA has been working on the constructive design of a container that can ensure easy transportation.

HRS 3150 D5/6

The 10ft container provides the same functionality as far as transformation and manageability as its 20ft counterpart is concerned, but it is also able to connect two generator sets working in parallel with a maximum power of 3,150 kVA. It features a single transformer, one medium voltage and another low voltage cell, an auxiliary control panel and a quick-connection set for medium voltage.


It comes with a voltage protection system depending on what configuration is needed for each project, and it also has an auxiliary control panel that allows the user to control all the performance measurements of both transformers.

HIMOINSA transformer substation

The HRS 6300 D5/6 and the HRS 3150 D5/6 incorporate a digitally-controlled transformer protection relay with measurements that is able to detect the oil pressure to guarantee the safety of the transformer and any equipment that is attached to it. The design of both substations allows medium/low voltage connections to be made easily and quickly thanks to its built-in connector set.


    • Versatile and ModularReliable and efficient modular units that respect the environment. Given that they are modular transformers, they can function independently, using only a part of the substation. This independent functionality undoubtedly increases their return on investment.
    • Space optimizationThe fact that it is possible to connect up to 4 generator sets directly to the substation makes it possible to considerably optimize the work space. In those cases where space is considered an important disadvantage, the option of a mobile transformer substation is the perfect solution.
    • Minimum power loss. These transformers have a 98.5% working reliability, which translates into minimum power loss during the transformation process and an increase in the power efficiency of the facility.
    • Choice of voltage. The substation allows the voltage to be transformed to 3.3 kV, 6.6 kV, 11kV or 24kV, thus proving how flexible it is when faced with the specific power requirements of any given project.

All the above means that this transformer substation is of particular interest to such sectors as the electricity industry, when they have to carry out grid repairs or they need back-up in the event of fluctuations in demand, or in the rental sector (mining, construction, events, etc.) that require specific solutions to power machinery that runs on both medium and low voltage.


The Sibanye Gold Mine Driefontein is located in the South African town of Sibanye (55 kilometres to the south east of the capital, Johannesburg). 9 HMW-1270 T5 generator sets have been installed in the mine, 4 of which have been connected to a HRS 6300 D5/6 transformer substation housed in a 20ft container. The substation is currently transforming an installed power of 5,080 kVA from low to medium voltage in order to power the machinery running in the mine.

The need to employ transformer substations is of vital importance to the mine, as the general grid cannot cope with the peaks of demand of the heavy machinery used in such projects.

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