Product Overview
The ABB SPAU 341 C1 is a legacy SPACOM‑family microprocessor‑based voltage regulator unit, purpose‑built for distribution‑substation power transformers equipped with on‑load tap‑changers. It maintains stable secondary‑side voltage by sending tap‑raise / tap‑lower control commands to the tap‑changer mechanism. It supports standalone single‑transformer operation as well as parallel‑running of multiple transformers with selectable parallel‑control algorithms. Built‑in line‑drop compensation compensates voltage loss across long distribution feeders. Continuous hardware‑and‑software self‑supervision detects internal faults and triggers IRF alarm output. Widely used as spare replacement for existing substation retrofit and maintenance projects for legacy ABB SPACOM‑based installationsABB Group.
Series
SPAU 341 C belongs to ABB SPACOM legacy protection‑and‑control relay portfolio. SPAU‑series devices focus on transformer tap‑changer voltage regulation. SPAU 341 C1 covers different auxiliary‑supply and frequency variants (AA, CA, DA, FA order suffixes) for global grid requirements. This product line has been superseded by modern ABB REX series protection relays for new‑build projectsABB Group.
Product Features
‑ Automatic and manual tap‑changer voltage regulation for OLTC‑equipped power transformers ‑ Supports multiple parallel‑operation control modes for multi‑transformer substations ‑ Line‑drop compensation function for feeder voltage‑loss correction ‑ 1 A / 5 A selectable phase‑current input; 100 V / 110 V / 120 V selectable voltage measuring input ‑ Three‑phase over‑current and under‑voltage blocking logic ‑ Tap‑changer position measurement and local front‑panel indication ‑ Built‑in continuous self‑supervision; IRF fault‑alarm relay for hardware‑software failures ‑ RS‑488 serial communication interface for remote monitoring and parameter setting ‑ Front‑panel push‑buttons for manual tap‑raise / tap‑lower, reset and parameter adjustment ‑ Panel‑mount metal housing for standard substation cabinet installation ‑ Direct drop‑in spare replacement for original SPAU 341 C1 hardware
Product Parameters
‑ Measuring Voltage Input: 100 V / 110 V / 120 V phase‑to‑phase, configurable ‑ Current Input: 1 A or 5 A nominal ‑ Rated Frequency: 50 Hz / 60 Hz (order‑code dependent) ‑ Auxiliary Supply Range: 80‑265 V AC / DC or 18‑80 V DC (variant‑dependent) ‑ Communication: RS‑488 serial interface ‑ Fault Output: IRF self‑supervision alarm relay ‑ Operating Temperature: ‑5 °C ~ +55 °C ‑ Storage Temperature: ‑25 °C ~ +70 °C ‑ Relative Humidity: 5‑95 %, non‑condensing ‑ Front‑panel Protection Rating: IP42 ‑ Mounting: Cabinet panel‑mount ‑ Approvals: CE compliant
Product Specifications
‑ Form Factor: Panel‑mount metal‑cased regulator relay ‑ Control Outputs: Relay outputs for tap‑raise and tap‑lower tap‑changer drive ‑ Parallel‑Operation Modes: Minimized circulating‑current, master‑slave, negative‑reactance principle ‑ Local Operation: Front‑panel push‑buttons, status LED indicators, fault‑code display ‑ Termination: Detachable screw terminal blocks for field wiring ‑ Cooling: Natural convection ‑ Compatibility: On‑load tap‑changer equipped power transformers in distribution substations ‑ Weight: Approx 5.65 kgABB Group ‑ Maintenance: Direct swap‑out spare unit for substation‑site repair
Function
SPAU 341 C1 measures transformer secondary‑side voltage and feeder‑line current. It compares measured voltage against set‑point values and outputs tap‑raise or tap‑lower relay commands to the on‑load tap‑changer to stabilize output voltage. Line‑drop compensation calculates and offsets voltage drop on downstream distribution feeders. It supports multiple parallel‑transformer control strategies to limit circulating currents. The unit monitors hardware and firmware status continuously; upon internal failure, it activates the IRF fault‑alarm relay. Operators can perform manual tap‑position adjustment via front‑panel push‑buttons, and read device status via RS‑488 serial link from remote control systemsABB Group.
Purpose
Regulate secondary‑side voltage for OLTC‑fitted power transformers inside distribution substations. Replace defective SPAU 341 C1 units to restore automatic tap‑changer voltage‑control function. Deployed for spare‑part stocking and maintenance of legacy SPACOM‑system‑based substations.
Application Fields
Medium‑voltage distribution substations, power‑plant auxiliary transformer control, industrial‑plant power‑distribution systems, legacy ABB SPACOM‑relay‑based substation maintenance and retrofit projects.
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