The piston closes the grounding contacts, establishing a solid 3-phase-to-earth short circuit.
The Ultimate Guide to ABB UFES: Ultra-Fast Earthing Switch Technical Manual and Applications Introduction to Arc Flash Mitigation abb+ufes+manual
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Before integration, verify that your specific switchgear parameters match the UFES ratings outlined in the official ABB technical manual: Specification Range Up to 17.5 kV or 40.5 kV (depending on kit model) Rated Frequency ( ) 50 / 60 Hz Rated Short-Time Withstand Current ( Ikcap I sub k ) Up to 50 kA (1 s) or 40 kA (3 s) Rated Peak Withstand Current ( Ipcap I sub p ) Up to 130 kA Total Extinguishing Time (typically around 1.5 to 2.5 ms for the switch itself) Control Voltage 110–240 V AC / DC 3. Installation Requirements and Mechanical Assembly : Type U1 units that use a micro
Because the UHEV relies on a fast-acting pyrotechnic charge and vacuum welding principles, Once the system trips to save your switchgear, you must perform a rebuild sequence.
: Type U1 units that use a micro gas generator and vacuum interrupter to achieve a closing time of less than 1.5 ms . Functional Overview