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08 February 2019

Siemens develops eco-friendly mobile substation

10-12-18-mobile-substation-siemens-wuhan (Orta)

The new mobile substation has been developed as part of Siemens’ grid resilience concept, Pretact® and is currently only available for the Chinese market.

The newly developed mobile substation combines the resilience-focus of the Pretact® concept with the latest innovation of digitally connected transformers – a 40 MVA / 110 kV Sensformer® filled with natural ester oil. It also includes a 126 kV highly integrated switchgear, a 126 kV surge arrester and a 12 kV gas-insulated switchgear (GIS).

The ester oil is biodegradable, and therefore environmentally friendly, and has a flash and fire point twice that of mineral oil. This overcomes the issue of the lack of fireproof systems. The substation is pre-fabricated, pre-commissioned and has a compact design meaning that it can be transported and installed extremely quickly with little on-site work needed.

Keeping the lights on is one of the main drivers of the Siemens Pretact® concept for maximized grid resilience. A major step has now been taken by the Siemens plant in Wuhan that had already been a forerunner of mobile substation technology with conventional transformers. The newly developed mobile substation combines the resilience-focus of the Pretact® concept with the latest innovation of digitally connected transformers – a 40 MVA / 110 kV Sensformer® filled with natural ester oil. It also includes a 126 kV highly integrated switchgear, a 126 kV surge arrester and a 12 kV gas-insulated switchgear (GIS).

A mobile substation performs the job of a normal substation; but instead of being static, it is mounted on a semi-truck or trailer for easy transportation to wherever it may be needed. This makes it ideal for ensuring an interim power supply when there is an outage or during planned maintenance work. However, it is not as simple as putting the components of a substation onto a trailer. There is usually no possibility to install fire proof systems such as firewalls and the unit has to be highly portable and quick to install.

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