The ABB UFE series (specifically the and UFE800 feeder terminals) are protection and control relays designed for Medium Voltage (MV) networks. They are widely used as the core control unit for the UFES (Ultra-Fast Earthing Switch) system.
The ABB UFES manual highlights several benefits that engineers and project managers can expect from using this platform: abb+ufes+manual
Once an arc is identified, the UFES electronics trigger the PSEs in less than 1 ms . The ABB UFE series (specifically the and UFE800
The ABB UFES is an active protection device rather than a passive safety feature. It actively creates a safe condition in just a few milliseconds by short-circuiting the fault to ground. From the simple "Service Box" installation to complex digital retrofits with Relion relays, the UFES adapts to a wide range of low- and medium-voltage environments. The ABB UFES is an active protection device
The ABB UFES is a low-maintenance system, but it is not completely "set-and-forget." Routine checks guarantee functional readiness. LED Status Indicators on the QRU
The UFES operates on a "detect and short" logic. The process consists of: