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As a combination of advanced detection electronics and ultra-fast primary switching elements, the UFES system is engineered to trigger a three-phase short-circuit to ground the instant a fault is detected, thereby eliminating the hazardous arc. This active approach limits the pressure rise inside the switchgear to a minimum, preventing the devastating thermal and mechanical damage typically associated with such events. This innovative arc quenching system provides the highest level of safety for personnel and equipment against the hazardous impacts of internal arc faults.

The serves as the authoritative technical reference for deploying the electrical industry's leading active arc flash mitigation technology . According to documentation in the ABB Library , the UFES functions by channeling the uncontrolled energy of an internal arc fault into a solid, three-phase metal ground connection within less than 4 milliseconds of detection . This specialized manual covers critical data on engineering, installation parameters, and system testing. It provides electrical engineers, panel builders, and plant operators with the technical blueprints required to drastically reduce arc flash incident energy and minimize facility downtime. Core Functional Elements of the UFES System

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Connect the trip lines from the QRU to the micro-gas generators using the specialized, shielded cables provided by ABB. Commissioning and Testing abb+ufes+manual

The technical performance of the UFES system is defined by key speed and power ratings.

+-------------------------------------------------------+ | UFES Electronic Control Unit | | [Type QRU1 (DTU)] OR [Type QRU100 (TU)] | +-------------------------------------------------------+ │ │ Dedicated High-Speed │ Tripping Cables ▼ +-------------------------------------------------------+ | Primary Switching Elements (PSE) Type U1 | | (Phase A) (Phase B) (Phase C) | +-------------------------------------------------------+ Primary Switching Elements (PSE) Type U1

ABB's Ultra-Fast Earthing Switch (UFES) provides active arc flash protection for medium and low-voltage switchgear by creating a controlled 3-phase short-circuit to earth, extinguishing arcs in less than 4 ms. The system uses electronic tripping units and primary switching elements (PSEs) to significantly reduce incident energy and damage, enhancing safety and reducing downtime compared to passive systems. For the full technical documentation, visit ABB Library UFES™ – Ultra-Fast Earthing Switch - ABB As a combination of advanced detection electronics and

This comprehensive guide serves as an essential companion to the official . It covers core technical specifications, components, operating principles, installation workflows, and maintenance requirements. 1. What is the ABB UFES?

Perform megger/insulation resistance tests on the primary circuit before connecting the QRU trip cables to the U1 elements to avoid damaging the electronics.

+-------------------------------------------------------+ | Arc Flash Sensing Network | | (Optical Sensors / Rogowski Coils / CT Summaries) | +---------------------------+---------------------------+ | v +-------------------------------------------------------+ | ABB UFES Electronic Unit | | [Type QRU1] OR [Type QRU100] | | (Internal Light/Current) (External Arc System) | +---------------------------+---------------------------+ | | Trip Signal (< 1.5 ms) v +-------------------------------------------------------+ | Primary Switching Elements (PSE) | | (3x Phase-to-Earth Micro-Gas Generators) | +---------------------------+---------------------------+ | v +-------------------------------------------------------+ | Solid 3-Phase Metallic Earth Fault | | (Arc Extinguished via Voltage Commutation) | +-------------------------------------------------------+ 1.1 Electronic Detection and Tripping Units The serves as the authoritative technical reference for

This section outlines the physical installation of the device units. It includes guidelines on:

The official ABB manual outlines specific installation requirements and configurations to ensure safe and effective operation. Installation must always be carried out by qualified personnel following the local safety regulations and the detailed instructions provided with the system.

: PSEs can be installed in cable connection compartments or on busbar sections.

Why choose ABB UFES over standard protection? The key differentiator is speed. Traditional arc protection might take tens of milliseconds to clear a fault—time enough for an arc to vaporize copper and burst enclosures. The ABB UFES extinguishes an internal arc fault in less than 4 milliseconds after detection. This blazing speed results in a 98% reduction in downtime and repair costs.

ABB UFES Manual: Complete Engineering Guide to Ultra-Fast Earthing Switches