ABB SPAJ110C Microprocessor-Based Earth-Fault Protection Relay

Description

Technical Specifications

• Product Type
  • Non-directional earth-fault protection relay (secondary relay)
• Protected System
  • Applicable System: Solidly earthed or low-resistance earthed power systemsABB Group
  • Rated Frequency: 50 Hz / 60 Hz
• Current Input
  • Rated Current (In): 1 A or 5 A (configurable)
  • Low-set Stage (I₀>): 0.1 ~ 0.8 × In
  • High-set Stage (I₀>>): 0.1 ~ 4.0 × In (or disabled)
  • Thermal Withstand: 4 A continuous (1 A In) / 20 A continuous (5 A In)
  • Dynamic Withstand: 250 A (1 A In) / 1250 A (5 A In)
• Time Characteristics
  • Low-set Stage: Definite time (0.05 ~ 100 s) or Inverse Time (IDMT)
  • Inverse Time Curves: Normal inverse, Very inverse, Extremely inverse, Long-time inverse (per IEC 60255-4, BS 142)
  • High-set Stage: Definite time (0.05 ~ 100 s)
  • Operating Time Accuracy: ±2% of set value or ±25 ms
• Auxiliary Power Supply
  • SPTU 240S1: 80 ~ 265 V AC/DC
  • SPTU 48S1: 18 ~ 80 V DC
  • Power Consumption: Approx. 4 W (standby), 6 W (operating)
• Output Contacts
  • Trip Contacts: 250 V AC/DC, 5 A continuous, 30 A for 0.5 s
  • Signal Contacts: 250 V AC/DC, 5 A continuous
  • Quantity: 3 ~ 4 configurable relay outputs
• Physical & Mechanical Data
  • Dimensions: 170 mm (H) × 100 mm (W) × 85 mm (D)
  • Weight: Approx. 1.2 kg
  • Mounting: Panel mounting (flush/semi-flush)
  • Protection Class: IP54 (front), IP20 (rear)
• Environmental Ratings
  • Operating Temperature: -10 °C to +55 °C
  • Storage Temperature: -40 °C to +85 °C
  • Relative Humidity: 5 – 95% RH (Non-condensing)
  • Vibration/Shock: Complies with IEC 61131-2
• Compliance & Certifications
  • Standards: IEC 60255, IEC 61000-6-2, IEC 61000-6-4
  • Certifications: CE, UL, cUL

Key Features

• Dual-Stage Earth-Fault Protection
  • Independent Dual Stages: Integrates low-set (I₀>) and high-set (I₀>>) protection stages for comprehensive fault coverageABB Group.
  • Flexible Time Curves: Low-set stage supports both definite-time and four selectable inverse-time characteristics for optimal coordination.
  • High-Set Instantaneous: High-set stage provides fast, definite-time clearance for severe fault conditionsABB Group.
  • Wide Setting Ranges: Extensive current and time settings ensure adaptability to diverse system conditions.
• Advanced Measurement & Monitoring
  • Precise Sensing: Accurately measures zero-sequence current via residual connection or core-balance CT.
  • Digital Display: Front-panel digital display for real-time parameters, settings, and fault data.
  • Fault Recording: Logs fault values, operating times, and event codes for post-fault analysis.
  • Continuous Sampling: High-speed signal sampling ensures fast and accurate fault detection.
• Self-Supervision & Diagnostics
  • Built-in Self-Test: Continuous hardware and software self-supervision with auto-diagnosticsABB Group.
  • Fault Alarm: Triggers internal alarm and indicates faults via front-panel LEDs upon detecting internal failures.
  • Event Logging: Stores and reports detailed event codes for system and relay diagnostics.
  • High Reliability: Minimizes relay failure risk and supports predictive maintenance.
• Flexible Configuration & Integration
  • Configurable Outputs: Output relay functions are freely configurable to meet specific application logicABB Group.
  • External Blocking: Supports blocking/deblocking via external residual voltage relays or remote signals.
  • Serial Communication: Equipped with a serial port for connection to fiber-optic SPA-bus and SCADA systems.
  • System Compatibility: Fully compatible with ABB’s Distribution Automation systemsABB Group.
• Robust Industrial Design
  • Conformal Coating: PCB protected against dust, humidity, and corrosive industrial atmospheres.
  • EMC Immunity: High immunity to electromagnetic interference per IEC 61000 standards.
  • Wide Temperature Range: Stable operation across extreme industrial temperature variations.
  • Long Service Life: Industrial-grade components ensure reliable long-term operation.

Application Scenarios

• Power Distribution Networks
  • Feeder Lines: Primary/backup earth-fault protection for outgoing feeders in distribution substationsABB Group.
  • Distribution Transformers: Protects distribution transformers against winding earth faultsABB Group.
  • Ring Main Units (RMUs): Integrated protection for compact secondary distribution systemsABB Group.
  • Cable Networks: Reliable earth-fault detection for underground power cable systemsABB Group.
• Industrial Power Systems
  • Large Motors: Earth-fault protection for high-voltage industrial motorsABB Group.
  • Generators: Backup earth-fault protection for synchronous and asynchronous generatorsABB Group.
  • MCCs: Protection for motor control centers in manufacturing plants.
  • Auxiliary Systems: Protects auxiliary transformers and drives in power plantsABB Group.
• Mining & Metals Industry
  • Mine Power Supply: Protection for underground and surface mine distribution networks.
  • Smelting Plants: Reliable operation in high-temperature, high-dust metallurgical environments.
  • Rolling Mills: Protects drive systems and auxiliary power suppliesABB Group.
• Oil & Gas Industry
  • Onshore/Offshore Platforms: Earth-fault protection for drilling and processing equipment.
  • Pumping Stations: Protects long-distance pipeline pump motors.
  • Refineries: Safe operation in hazardous and corrosive process areas.
• Water & Wastewater Treatment
  • Pump Stations: Protects large water supply and drainage pump motors.
  • Treatment Plants: Reliable protection for process equipment and distribution systems.
• Marine & Offshore
  • Shipboard Power: Earth-fault protection for marine electrical distribution systems.
  • FPSO Vessels: Robust performance under marine vibration and humidity conditions.