
The definition of mobile substation or portable substation is a completely self-contained trailer-mounted substation consisting of a transformer, cooling equipment, high voltage switchgear, and low voltage switchgear along with metering, protection relaying devices, AC and DC auxiliary power supply, surge protection, and cable connecting arrangement. [pdf]
Industrial power supply systems: Mobile substations can provide a reliable and secure power supply for industrial plants that require high power quality, availability, and efficiency. They can also provide backup power or load sharing for critical processes, such as oil and gas production, mining operations, chemical plants, etc.
They are pivotal in ensuring a reliable power supply during emergencies, maintenance, or in remote areas. By housing all necessary components within a portable framework, mobile substations offer flexibility, cost-effectiveness, and rapid deployment, making them ideal for a range of applications, from disaster recovery to temporary power support.
Cable connecting system: The cable connecting system is the component of a mobile substation that connects the mobile substation to the power source and the load using flexible cables and connectors. The cable connecting system has to be designed to provide easy and secure connection and disconnection of the cables.
Temporary mobile substations are deployed when there is a planned interruption or maintenance of existing substations, or when new construction or power upgrades are underway. These substations prevent service interruptions by taking over the role of the permanent substation for a specific time frame.
Metering system: The metering system is the component of a mobile substation that measures and records the electrical parameters of the power flow, such as voltage, current, power, frequency, etc. The metering system has to be designed to provide accurate and reliable data for monitoring and billing purposes.
The switchgear enables the routing of electricity within the substation and allows isolation of faults without affecting the entire system. Modular switchgear solutions in mobile substations support multiple configurations, ensuring compatibility with varying power systems.

Led by the Asian Development Bank (ADB) and co-financed by Australia, the European Union, the Second Danish Cooperation Fund for Renewable Energy and Efficiency for Rural Areas, and the Global Climate Facility, OIREP’s focus was installation of solar energy capabilities to nine outer islands of Tonga, with the aim of increasing the reliability, efficiency and affordability of electricity on these islands. [pdf]
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