ABB PQF4-3 TAS.580 Arc Protection Relay / Arc‑Flash Protection Unit

Description

Hardware & Electrical Specifications

‑ Manufacturer: ABB ‑ Functional Type: Arc‑Flash Protection Relay ‑ Current Input: 3‑phase AC current inputs from current transformers ‑ Sensor Input: Multi‑channel optical fiber arc‑light sensor interfaces ‑ Operating Principle: Light‑only, current‑only, light + current dual‑condition tripping modes ‑ Trip Reaction Time: Typical 1‑7 ms total detection‑to‑trip output ‑ Auxiliary Power: 24‑250 VAC / 24‑250 VDC wide‑range auxiliary supply ‑ Output Contacts: Multiple high‑speed trip relay outputs, alarm signal contacts ‑ Local Interface: Front‑panel LCD display, push‑button keypad for parameter configuration ‑ Data Logging: Stores arc‑fault event records, fault timestamp and measured current values ‑ Communication: RS485 interface, supports Modbus‑RTU protocol for remote monitoring ‑ Connectors: Screw terminals for CT inputs, auxiliary power, trip/alarm outputs; fiber‑optic ports for arc sensors ‑ Mounting: Switchgear front panel cut‑out mounting ‑ PCB Finish: Conformal coated for harsh switchgear‑cabinet environment

Environmental Specifications

‑ Operating Temperature: ‑20 °C ~ +60 °C ‑ Storage Temperature: ‑40 °C ~ +85 °C ‑ Relative Humidity: 5%‑95 % non‑condensing ‑ EMC: Complies with power‑industry switchgear EMI and transient standards

Mechanical Data

‑ Weight: approx 1.1 kg

Core Functions

1. Arc‑flash fault detection: Combines optical arc‑light detection and over‑current condition to identify internal arc faults inside switchgear compartments.
2. Ultra‑fast tripping output: Provides high‑speed relay trip signals to upstream circuit‑breakers to limit arc‑energy release and equipment damage.
3. Flexible logic configuration: Selectable operating modes: light‑only, current‑only, light‑and‑current dual‑condition interlock trip.
4. Fault event recording: Captures fault timestamp, current magnitude and triggered sensor channel for post‑incident analysis.
5. Remote supervision: Modbus‑RTU communication uploads fault and alarm status to plant SCADA / DCS system.

Installation, Replacement & Critical Warnings

1. De‑energize auxiliary supply, CT secondary circuits and trip‑circuit wiring before replacement. Unit is non‑hot‑swappable. CT secondary circuits present dangerous open‑circuit voltage hazards.
2. Verify optical arc‑sensors are correctly routed and fixed inside each switchgear compartment; mis‑positioned sensors result in missed arc‑fault detection.
3. Configure light sensitivity threshold and over‑current pickup setting according to switchgear design; overly‑sensitive parameters cause nuisance tripping.
4. After installation, perform functional test: simulate arc‑light signal and over‑current condition to validate trip‑relay action.

5. Common failure mode: Degradation of optical‑sensor fiber, surge damage to CT input circuits. Check sensor alignment and fiber integrity when loss‑of‑sensor alarms appear.