ABB SPAA 341 C2 | Numerical Feeder Protection Relay

The ABB SPAA 341 C2 (Revision A) is a legacy numerical feeder protection relay belonging to the widely utilized SPACOM series. It is specifically designed to provide selective overcurrent and earth-fault protection in medium-voltage distribution systems, offering a reliable, compact, and field-proven solution for both utility and industrial power networks.

⚙️ Product Parameters & Technical Datasheet

• Device Type: Numerical Overcurrent and Earth-Fault Relay

• Part Number: SPAA 341 C2 (Rev. A)

• Protection Functions: Low-set and high-set stages for both phase overcurrent and earth-fault protection

• Measurement: True RMS measurement of current inputs

• Communication: Integrated SPA-bus fiber-optic interface for remote monitoring and parameterization

• Auxiliary Power: Wide-range auxiliary voltage (80–265 V AC/DC)

• Dimensions: Standard SPACOM housing (approx. 135 mm x 150 mm x 230 mm)

• Weight: Approximately 2.8 kg

• Origin: Finland

🏗️ Application Areas

The SPAA 341 C2 is typically found in medium-voltage distribution switchgear. Its primary applications include:

• Distribution Feeders: Providing primary protection for underground cables and overhead lines.

• Substation Automation: Interfacing with SCADA systems for remote fault alarming and status monitoring.

• Industrial Power Distribution: Safeguarding transformer feeders and auxiliary power circuits against phase-to-phase and phase-to-earth faults.

• Legacy Systems: Often utilized in long-term infrastructure where replacing older electromechanical relays with digital standards is required without changing the physical panel layout.

🛠️ Product Usage Instructions

1. Safety First: Before installing or removing the relay, ensure all current transformer (CT) secondary circuits are short-circuited to prevent hazardous high voltages.

2. Mounting: Slide the unit into its panel cutout and secure it using the integrated locking sleeves. Ensure the panel environment is clean and free of excessive vibration.

3. Wiring: Terminate the current inputs and auxiliary power on the rear of the unit. Ensure the fiber-optic cable for the SPA-bus is clean and properly seated to maintain signal integrity for communication.

4. Configuration: Use the front panel display and push-buttons to set the trip thresholds and time-current characteristics (IDMT curves).

5. Testing: Conduct secondary injection testing to verify the trip logic. Ensure the “Trip” contacts are correctly mapped to the circuit breaker’s trip coil circuit.

6. 

❓ Frequently Asked Questions (Q&A)

What does the “C2” suffix indicate? The C2 suffix refers to the specific internal software version and hardware feature set that defines the relay’s protection curves and I/O capability.

How do I integrate this into a modern SCADA system? The relay uses the SPA-bus protocol. To connect it to modern networks (like Modbus or IEC 61850), you typically need a communication gateway or a fiber-to-serial converter.

What causes the “Self-Check” error? The internal watch-dog circuit monitors hardware health. If the self-check LED lights up, it indicates a memory, CPU, or power supply fault within the unit. Power cycle the relay; if the error persists, the unit requires professional service.

Can the settings be modified via computer? Yes, by connecting a fiber-optic link to a PC running ABB’s SPACOM configuration software, you can perform full device parametrization and event log retrieval.

📋 Similar Model Recommendations

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2. ABB REJ 601 (Modern replacement series)

3. Schneider Electric Sepam 1000+ Series

4. Siemens Siprotec 7SJ60

5. GE Multilin 750 Series

6. Alstom MiCOM P12x Series

7. VAMP 50 Series

8. SEL-501 Universal Overcurrent Relay

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