ABB SPAD346C3 Three-Phase Stabilized Differential Relay(XIONGBA)

ABB SPAD346C3 Three-Phase Stabilized Differential Relay(XIONGBA)

Brand Model: ABB SPAD346C3
Product Name: Three-Phase Stabilized Differential Relay
Weight: 2.145 kg
Origin: Sweden
Documentation: Contact ABB’s power systems division for detailed datasheets and CAD models.

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Description

ABB SPAD346C3: Three-Phase Stabilized Differential Relay for Power System Protection

Product Overview

The ABB SPAD346C3 is a three-phase stabilized differential relay designed for critical protection of power transformers, generators, and motor-generator units in industrial and utility applications. Building on the legacy of the SPAD346C (discontinued since 2012), the SPAD346C3 enhances performance with advanced protection algorithms, broader protocol support, and rugged hardware. While no longer actively promoted by ABB, it remains a viable solution for legacy systems and is supported through repair services (e.g., REPSPAD346C3) 19.

Technical Specifications

Parameter Value
Product Model ABB SPAD346C3
Product Type Three-Phase Stabilized Differential Relay
Protection Functions – Three-phase differential protection
– Overcurrent protection
– Earth fault protection
– Second harmonic restraint (inrush blocking)
– Fifth harmonic restraint (overexcitation blocking)
Current Inputs 1A or 5A (CT secondary current)
Voltage Inputs 80–265V AC/DC (control power)
Output Relays 4x trip outputs, 4x signal outputs
Communication RS-485 (Modbus RTU), optional IEC 61850 support via SPA-ZC 400 adapter 16
Operating Temperature -25°C to +70°C (extended range compared to SPAD346C)
Enclosure Rating IP20 (indoor use)
Weight 2.145 kg
Compliance CE, IEC 60255-35 (differential protection), EN 61000-6-2 (EMC immunity)

Key Features and Advantages

Enhanced Protection Algorithms:

 

  • Stabilized Differential Protection: Compares phase currents on both sides of the protected device to detect internal faults (e.g., winding short circuits, interturn faults) while avoiding false tripping during external faults or inrush currents.
  • Harmonic Restraint:
    • Second harmonic blocking suppresses operation during transformer energization.
    • Fifth harmonic blocking prevents tripping during overexcitation (e.g., voltage surges) 69.

 

Flexible Configuration:

 

  • Vector Group Matching: Numerically adjusts for transformer phase shifts (e.g., Y-Δ configurations) without intermediate CTs, simplifying setup.
  • Wide CT Ratio Correction: Supports digital adjustment of CT ratios for precise fault detection across diverse transformer designs 6.

 

Rugged Design:

 

  • High EMI/EMC Immunity: Resistant to electrical noise in substations and industrial environments.
  • Continuous Self-Monitoring: Built-in diagnostics for real-time health checks and fault logging.

 

Modern Connectivity:

 

  • Modbus RTU for basic communication; IEC 61850 compatibility is achievable via the SPA-ZC 400 adapter, enabling integration with digital substation systems 1619.
  • Event Logging: Stores up to 10,000 events with timestamps for post-fault analysis.

Application Areas

The SPAD346C3 excels in protecting:

 

  • Power Transformers:
    • Dual-winding and three-winding transformers in substations and industrial plants.
    • Generator-transformer units in power generation facilities.
  • Motors and Generators:
    • Stator winding short circuits and interturn fault protection.
    • Backup protection for large industrial motors.
  • Specialized Systems:
    • Compensation reactors and short cable lines.
    • Not suitable for frequency converter-driven systems due to harmonic filtering limitations 6.

Installation and Maintenance

Setup Guidelines:

 

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

 

Maintenance Recommendations:

 

  • Periodic Checks: Verify CT connections and relay settings annually. Clean dust from vents to maintain thermal stability.
  • Firmware Updates: While the SPAD346C3 is legacy, ABB’s repair services (REPSPAD346C3) include firmware updates and component replacement.
  • Spare Parts: Contact ABB’s authorized distributors for refurbished units or compatible replacements like the REL670 series (modern alternative) 1112.

Product Availability and Support

  • Legacy Status: The SPAD346C3 is no longer actively manufactured but remains operational in existing systems. ABB offers repair services (REPSPAD346C3) with a 2-year warranty on replaced components.
  • Alternatives: For new installations, consider ABB’s REL670 series, which offers advanced features like IEC 61850 native support, enhanced diagnostics, and integration with digital substations 1118.
  • Documentation: Technical manuals and configuration guides are available through ABB’s customer support portal.

Compliance and Certifications

  • Standards: Meets IEC 60255-35 (differential protection) and EN 61000-6-2 (industrial EMC immunity).
  • Environmental Compliance: RoHS-compliant for hazardous substance restrictions.

Product Warranty and Lifecycle

  • Warranty: 1 year for new units; 2 years on repaired components.
  • Lifecycle: In the Limited Phase of ABB’s lifecycle management, with service support and spare parts available but no further product enhancements 24.
  • Lead Time: Repaired units available within 4–6 weeks; refurbished stock varies.

 

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