: Optical sensors detect the sudden flash of light, while current transformers detect the accompanying overcurrent. To prevent nuisance tripping, the UFES manual dictates that both criteria (light AND current) must typically be met simultaneously.
Because the UFES operates using an irreversible chemical process in its micro gas generator, specific maintenance steps are required: Ultra-Fast Earthing Switch - Type UFES - ABB
The UFES primary switching elements are . Once triggered, they must be replaced. Isolate the System: Ensure the switchgear is safe to enter.
: Verify that the QRU "Ready" LED is active, indicating that the internal capacitors are charged, the firing circuits are intact, and no internal faults are present. 5. Maintenance, Lifespan, and Resetting After a Trip
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. abb+ufes+manual
ABB offers a two-day training course structured as 40% theory and 60% hands-on practice, with a maximum of 5 participants per session. The course covers UFES technology, component functions, operation elements, installation, commissioning, and maintenance concepts. Upon completion, participants understand the constructional design, installation procedures, and safety rules.
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The ABB UFES manual provides a comprehensive resource for understanding and operating the UFES system. The manual covers topics such as:
The heart of the UFES is the U1 type primary switching element. When a fault is detected, the PSE executes the physical closure. It is a vacuum-based interrupter designed for extreme reliability. When triggered, the UFES closes all three phases to ground simultaneously, effectively eliminating the arc voltage. Each PSE is similar in size to a 24 kV rod insulator, measuring approximately 137 mm in diameter and 210 mm in height. : Optical sensors detect the sudden flash of
Guidelines for replacing the device unit after it has been operated (fired). 4. Safety Precautions (As Per Technical Manual)
Elias rubbed his eyes, the grit of thirty hours without sleep grinding against his eyelids. Before him sat the relic: an , a yellowed giant of industrial steel dating back to the late 90s. It was a donation from a decommissioned steel plant, intended for the robotics lab, but it had arrived dead on arrival.
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The UFES consists of two primary parts that work together to provide active protection: Electronic Unit (TU/DTU) : Available as the (tripping unit for external systems) or Once triggered, they must be replaced
: These are the vacuum-based quenching units that initiate a three-phase short-circuit to earth. They feature an extremely short mechanical closing time of less than 1.5 ms. 2. Key Technical Specifications Medium Voltage (MV) Low Voltage (LV) Max Rated Voltage ( cap U sub r Up to 40.5 kV Up to 1.4 kV Short-Time Current ( cap I sub k 50 kA (3s) / 63 kA (1s) 100 kA (0.5s) Extinguishing Time < 4 ms (after detection) < 4 ms (after detection) PSE Dimensions Ø 137 mm x 210 mm Ø 137 mm x 210 mm 3. Installation and Configuration The UFES system can be integrated into new UniGear ZS1 switchgear
: Indicates a broken or severely bent fiber optic cable, or a dirty sensor lens. Inspect the entire run of the affected sensor path.
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Three units that create the metallic short-circuit in less than 1.5 ms.
If you are looking for specific troubleshooting or troubleshooting assistance, always refer to the specific version of the manual corresponding to your UFES model.