ABB SPAD346C Stabilized Differential Relay(XIONGBA)

ABB SPAD346C Stabilized Differential Relay(XIONGBA)

Brand Model: ABB SPAD346C
Product Name: Stabilized Differential Relay
Warranty: 1 year (new units); 2 years on repaired components78
Weight: 1 kg
Origin: Finland
Lead Time: Repaired units available within 4–6 weeks

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Description

ABB SPAD346C: Stabilized Differential Relay for Power Transformer and Generator Protection

Product Overview

The ABB SPAD346C is a stabilized differential relay designed for critical protection of power transformers and generator-transformer units in industrial and utility applications. Engineered to detect internal faults such as winding short circuits, interturn faults, and earth faults, the SPAD346C combines advanced protection algorithms with robust hardware to ensure reliable operation in harsh environments. While the product is no longer in active production (discontinued since 2012)6, it remains widely used in legacy systems and is supported through ABB’s repair services (e.g., REPSPAD346C)8.

Technical Specifications

Parameter Value
Product Model ABB SPAD346C
Product Type Stabilized Differential Relay (Legacy Product)
Protection Functions – Three-phase differential protection
– Overcurrent protection
– Earth fault protection
– Second harmonic restraint (inrush current blocking)
– Fifth harmonic restraint (overexcitation blocking)
Current Inputs 1A or 5A (CT secondary current)
Voltage Inputs 18–80V AC/DC (control power)
Output Relays 4x trip outputs, 4x signal outputs
Communication RS-485 (Modbus RTU) (optional)
Operating Temperature -20°C to +70°C
Enclosure Rating IP20 (indoor use)
Weight 1 kg
Compliance CE, IEC 61850-90-5 (partial), EN 61000-6-2 (EMC immunity)

Key Features and Advantages

Precision Fault Detection:

 

  • Differential Protection: Compares phase currents on both sides of the protected device to detect internal faults with high sensitivity. The relay uses stabilized characteristics to avoid 误动作 during external faults or transformer inrush currents16.
  • Harmonic Restraint:
    • Second harmonic blocking prevents tripping during transformer energization (inrush current).
    • Fifth harmonic blocking suppresses false operation during overexcitation (e.g., voltage surges)19.

 

Flexible Configuration:

 

  • Wide CT Ratio Correction: Supports digital adjustment of current transformer (CT) ratios for precise fault detection across different transformer designs16.
  • Vector Group Matching: Eliminates the need for intermediate CTs by numerically matching phase shifts in transformer windings (e.g., Y-Δ configurations)9.

 

Rugged Design:

 

  • High Immunity to EMI/EMC: Resistant to electrical and electromagnetic interference, ensuring stable performance in high-noise environments like substations16.
  • Continuous Self-Monitoring: Built-in hardware and software diagnostics for real-time health checks and fault logging6.

 

User-Friendly Interface:

 

  • Phase Current/Angle Display: Simplifies CT circuit verification and vector group alignment during commissioning16.
  • Event Logging: Records up to 10,000 events with timestamps for post-fault analysis9.

Application Areas

The SPAD346C excels in protecting critical power equipment:

 

  • Power Transformers:
    • Dual-winding transformers in substations and industrial plants.
    • Generator-transformer units in power generation facilities.
  • Motors and Generators:
    • Protection against stator winding short circuits and interturn faults.
    • Backup protection for large industrial motors9.
  • Specialized Applications:
    • Compensation reactors and short cable lines.
    • Not suitable for frequency converter-driven systems due to harmonic filtering limitations9.

Installation and Maintenance

Setup Guidelines:

 

  • CT Configuration: Connect primary and secondary CTs to the relay, ensuring proper polarity and ratio settings. Use shielded cables to minimize noise9.
  • Vector Group Adjustment: Configure the SGF1/1–8 switches to match the transformer’s vector group (e.g., Dyn11, YNd11) for accurate phase alignment9.
  • Software Tools: Use ABB’s SPACOM software for parameter setup, event logging, and remote monitoring.

 

Maintenance Recommendations:

 

  • Periodic Checks: Verify CT connections and relay settings annually. Clean dust from vents to maintain thermal stability.
  • Firmware Updates: Although the SPAD346C is legacy, ABB’s repair services (REPSPAD346C) include firmware updates and component replacement8.
  • Spare Parts: Contact ABB’s authorized distributors for refurbished units or compatible replacements like the SPAD346C3 (three-phase variant)1114.

Product Availability and Support

  • Legacy Status: The SPAD346C is no longer manufactured but remains operational in existing systems. ABB offers repair services (REPSPAD346C) with a 2-year warranty on replaced components8.
  • Alternatives: For new installations, consider ABB’s SPAD346C3 (three-phase differential relay) or modern protection relays like the REL670 series, which offer enhanced communication and integration with digital substations611.
  • Documentation: Technical manuals and configuration guides are available through ABB’s customer support portal.

Compliance and Certifications

  • Standards: Meets IEC 61850-90-5 (partial) for substation automation and EN 61000-6-2 for industrial EMC immunity.
  • Environmental Compliance: RoHS-compliant for hazardous substance restrictions10.

 

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