Battery Energy Storage Systems (BESS) are large-scale battery systems for storing electrical energy. BESS has become an increasingly important component to maintain stability in the electrical grid as more distributed energy resources (DER) are integrated. Distributed energy resources often are sources of electrical energy such as photovoltaic systems or wind turbines which do not have steady and controllable energy production. A BESS allows energy from an intermittent energy source to be stored when production capability is high and demand is low and then later be used in times of high demand or as a backup for critical systems.
The benefits of utilizing battery-supported distributed energy resources include cost savings, clean energy, and reduced downtime. It is vital that the electrical integrity of the systems is properly monitored to maintain the benefits as there are some safety hazards associated with battery systems when not properly maintained and monitored. Li-Ion fire is one such hazard that can occur due to ground faults or poorly maintained battery management systems.
BESS most commonly operate as ungrounded systems, which means all line conductors are intentionally isolated from ground. Ungrounded systems are capable of operating under a ground fault condition, making them especially useful for mission-critical electrical systems where unplanned downtime is particularly dangerous or expensive. Although these systems can continue to operate with a single ground fault, it is vital to indicate and clear the first fault as quickly as possible. If the fault is not cleared, a second fault will eventually develop, and a line-to-line short will occur. Our insulation monitoring devices (IMDs) will give advanced notice of a first fault condition which allows for time to properly identify and clear the fault before a catastrophic issue arises. Bender offers a wide range of IMDs for virtually all sizes BESS, from small-scale deployments to large-scale, utility-grade systems.
Most BESS operate via an ungrounded system design, however, there are some grounded installations in use. Grounded systems must also have proper ground fault protection to operate safely and minimize downtime. It is critical to monitor for ground faults at low leakage current levels to detect and clear issues before they trip a protection device (such as a breaker) and/or damage the batteries. Our residual current monitors (RCM) are able to detect low-level AC and DC ground faults to indicate minor issues before they become major issues, such as equipment fires or system shutdowns.
Minimize System Downtime
Electrical issues can be detected and located while keeping the installation fully energized.
Automatically Locate Faults
Automatic fault location provides remote diagnostic tools which eliminates the need to have technicians on site during the fault.
Ground-fault location at packs and modules minimizes battery fire risk (with quick repair).
Reduce Maintenance Costs
Significant decrease in maintenance costs due to the accuracy of detection and decreased need for human interaction with the system.
|Product Overview ISOMETER®/ISOSCAN®
|Product Overview - Residual Current Monitoring
|Electrical Safety in Control and Auxiliary Circuits
|Battery Energy Storage Systems Flyer
|Insulation Fault Location