For older switchgear that does not have an internal‑arc classification (non‑IAC), UFES is particularly valuable because it provides active protection where passive pressure‑relief systems are either absent or ineffective. The manual includes case studies showing how a UFES retrofit can reduce repair costs from a total panel replacement to simply cleaning and replacing the PSEs and fuses.
Disclaimer: This guide is a technical synthesis of publicly available ABB literature. For specific documentation such as "ABB+Ufes+Manual" PDFs, wiring diagrams, or factory-specific firmware instructions, always consult the original manufacturer documentation provided with your specific device.
If you are using ABB equipment at UFES or any Brazilian facility, you must comply with local regulations. The ABB manual alone is not enough—you must also follow: abb+ufes+manual
A typical UFES system controlled by a UFE relay consists of:
: 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 For older switchgear that does not have an
What is the of your QRU (e.g., QRU100 or QRU200)?
The QRU100 does not include its own light or current detection. Instead, it relies on an external arc‑detection system – most commonly ABB’s REA arc‑flash relay. The QRU100 accepts a closing command from the REA and then fires the PSEs. This combination is used when a more complex protection zone is needed (e.g., a long bus section with many light sensors). The QRU100 manual shows: They feature an extremely short mechanical closing time
Proper installation ensures the system operates reliably without accidental tripping. Primary Element Placement
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Using specialized ABB testing software and injection kits, simulate an overcurrent and light signal simultaneously to verify that the QRU processes the logic correctly. Note: Disconnect the UHEV ignition leads before this test to avoid accidental deployment. 6. Post-Trip Procedure: Resetting the System