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The electronic unit (QRU1) monitors for light (via arc sensors) or current surges.
Conduct a full commissioning test sequence before putting the switchgear back into service. 6. Technical Specifications Summary
: The QRU relies on internal storage capacitors to deliver the firing pulse. The manual prescribes functional tests to ensure these components hold their required charge. Post-Trip Procedure (One-Time Use)
Proper installation is critical to ensure the ultra-fast operation of the UFES system. Always refer to the specific engineering drawings provided in your ABB UFES manual, but the standard workflow includes the following phases: Mechanical Mounting abb+ufes+manual
This guide provides a comprehensive overview of the ABB UFES system. For the most detailed and specific instructions, always refer to the official ABB manuals and technical documentation for your specific equipment and project requirements.
Reduces downtime compared to traditional arc mitigation systems. 2. Key Components of the UFES System
. It functions by initiating a 3-phase short-circuit to earth, which rapidly drops the arc voltage and extinguishes the fault before significant pressure or thermal damage occurs. System Components The electronic unit (QRU1) monitors for light (via
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 electronic components require minimal maintenance, but the system must be inspected annually. Routine Maintenance Checklist
The electronic tripping unit is designed for speed and reliability, supporting both light and current sensors. 3. Installation and Commissioning (Manual Guidelines) Technical Specifications Summary : The QRU relies on
Proper installation ensures the system operates reliably without accidental tripping. Primary Element Placement
The feeder circuit-breaker finally shuts down the resulting controlled earth fault current. Technical Specifications UFES | ABB - Core components