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Line differential protection

ABB’s bay protection solutions are designed to ensure safe and reliable operation of line and cable feeders for distribution, sub-transmission and transmission systems.

The protection solutions for line or cable feeders are designed to accommodate different busbar arrangements across all voltage levels. The protection functions are split between two groups of hardware (main 1 and main 2) to achieve adequate dependability. 

Typical applications

Short lines/cables
Short lines and cables can be directly linked by fiber optic cable for biased differential protection. Depending on the  parameters of the system, distance protection can be applied.

Medium lines
Medium line applications can be protected by both differential and distance protection schemes when communication links are available. Such lines are commonly found in strongly meshed power grids, sometimes with multiple circuits on individual transmission towers/distribution poles, and in power grids using series capacitor compensation.

Long lines
Long line applications are normally equipped with distance protection, and the advantages of differential protection are usually offset by communication repeaters, route switching, etc. The bay protection solutions on long line applications may have decentralized busbar and breaker-failure protection schemes, which can be accommodated in line bay protection solutions.

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