Fuse protection for high-performance electrical energy storage systems

Fuse protection for high-performance electrical energy storage systems

New Products |
By Nick Flaherty

Mersen has launched two families of fuses for protecting battery racks and banks, battery containers and inverters in energy storage systems.

The GBAT and ABAT product lines were specially developed for 1000V to 1500VDC.

Electrical energy storage systems are used to control and regulate energy generated by heterogeneous and non-permanent sources – such as wind and sun. They also have a buffer function to compensate for discrepancies between power generation and consumption, which makes them a key component of an intelligent electric power network.

Modern battery and electrical energy storage systems, which often achieve outputs of several hundred MWh, have stringent safety requirements. Constantly increasing outputs can cause short circuits of several 100 kA. Another challenge is the occurrence of load profiles with widely varying charge and discharge cycles, which must permanently shut off fuses in order to function properly in the event of a fault.

The ABAT15 fuses were developed for 1500 VDC applications for battery rack and section protection. They can withstand high load changes and low power losses, which improves system reliability and efficiency and makes them ideal for use with batteries and battery-related systems. ABAT15A can quench fault currents up to 3 times the rated current. ABAT15C and D are the fatest fuses of their category to protect protection against large short circuits such as those that occur in electrical energy storage systems. With current ratings from 500A up to 1600A, they have been tested up to 250 kA.

The GBAT fuse series was specially developed to protect the line when the DC/Dc converter is not next to the EES as well as the battery systems. These fuses provide protection throughout the entire range, from very small surge currents to DC fault currents up to 150kA. The series includes different ratings in 1000VDC and 1500VDC, with several sizes. They are available with bolt-on blades for direct mounting or with plain blades.

International (IEC) standards committees have drafted IEC 60269-7, a new standard for fuse links for protecting battery systems, defining the requirements for fuses. In the event of a short circuit they must limit the current substantially and be able to shut off the current very quickly. Both the ABAT product line and the GBAT fuse series conform to the new draft of the IEC 60269-7 standard for battery protection.

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