+86 18030182217
+86 18030182217
sandydcsplc@gmail.com
Description
ABB SPAJ140C Combined Overcurrent and Earth-Fault Relay
Product Overview
The ABB SPAJ140C is a high-performance numerical protection relay designed for selective short-circuit and earth-fault protection in radial feeders across solidly earthed, resistance-earthed, or impedance-earthed power systems. As part of ABB’s SP AJ series, the ABB SPAJ140C combines advanced overcurrent and earth-fault protection functions in a compact form factor, making it ideal for industrial automation, power distribution, and critical infrastructure applications. It supports both definite time and inverse definite minimum time (IDMT) characteristics for flexible fault response, ensuring precise coordination with upstream and downstream protection devices.
Featuring three-phase low-set and high-set overcurrent units, the ABB SPAJ140C delivers dual-stage protection against overloads and short circuits. The low-set phase overcurrent unit operates with adjustable time delays (0.05–300 seconds) or IDMT curves, while the high-set unit provides instantaneous or time-delayed tripping for severe faults. The earth-fault protection includes both low-set (sensitive) and high-set units, addressing both low-level leakage currents and high-magnitude ground faults. Built-in circuit breaker failure protection enhances system reliability by triggering backup protection in the event of breaker malfunction.
The ABB SPAJ140C incorporates a self-diagnostic system that continuously monitors internal components and communication integrity, reducing downtime through early fault detection. Its front-panel display allows local configuration of settings, real-time monitoring of measured values, and review of fault records. With support for serial communication (e.g., RS-485) and fiber optic bus modules (e.g., SPA-ZC 17 BB/MM), the relay integrates seamlessly with SCADA systems and digital substations, enabling remote control and diagnostics. Designed for harsh industrial environments, the ABB SPAJ140C withstands wide temperature ranges (-25°C to +70°C) and offers robust EMI/RFI protection, ensuring consistent performance in demanding conditions.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | SPAJ140C |
| Manufacturer | ABB |
| Product Type | Combined Overcurrent and Earth-Fault Relay |
| Rated Input Current | 1A or 5A (selectable via terminal block) |
| Rated Frequency | 50/60 Hz |
| Auxiliary Voltage | 80–265 V AC/DC |
| Protection Functions | Three-phase overcurrent (low/high-set), earth-fault (low/high-set), circuit breaker failure protection |
| Time Current Characteristics | Definite time, IDMT (IEC 60255-3 compliant) |
| Communication Interfaces | RS-485 (Modbus RTU), fiber optic bus (optional modules) |
| Output Relays | 2 heavy-duty (5A) + 4 light-duty (2A) relays, field-selectable |
| Accuracy | ±1% of set value |
| Operating Temperature | -25°C to +70°C |
| Physical Dimensions | 150 mm x 240 mm x 350 mm (varies by mounting configuration) |
| Weight | 1.9 kg |
| Safety Certification | IEC 61508 (SIL 2 capable), CE |
Key Features and Advantages
Dual-Stage Overcurrent Protection: The ABB SPAJ140C provides low-set and high-set overcurrent units, allowing precise differentiation between overloads and short circuits. The IDMT characteristic ensures faster tripping for higher fault currents, optimizing coordination with upstream devices.
Comprehensive Earth-Fault Protection: The relay’s low-set earth-fault unit detects low-level leakage currents with IDMT or definite time characteristics, while the high-set unit offers instantaneous tripping for severe ground faults, minimizing damage to equipment and personnel.
Circuit Breaker Failure Protection: In the event of a breaker failure to clear a fault, the ABB SPAJ140C initiates backup protection by tripping adjacent breakers, preventing cascading failures.
Flexible Configuration: Users can adjust settings via the front-panel keypad or remote software, tailoring protection parameters (e.g., pickup current, time delays) to specific application requirements. The relay supports split-range signaling and multiple tripping schemes for diverse system layouts.
Robust Communication Capabilities: With built-in RS-485 and optional fiber optic interfaces, the ABB SPAJ140C enables seamless integration with modern power management systems, facilitating real-time data exchange and remote diagnostics.
Self-Diagnostic System: Continuous monitoring of internal components and communication links ensures early detection of faults, reducing maintenance efforts and improving system availability. Fault records are stored locally for detailed analysis.
Applications
The ABB SPAJ140C is widely used in industries requiring reliable protection for medium-voltage power systems:
- Power Distribution: Protects radial feeders in substations and industrial plants, ensuring selective fault isolation to maintain continuity of supply.
- Oil and Gas: Safeguards critical equipment such as pumps, compressors, and offshore platforms from overcurrent and earth-fault conditions.
- Mining: Provides robust protection for conveyor systems, crushers, and ventilation equipment in harsh underground and surface environments.
- Water/Wastewater: Monitors pumps and motors in treatment facilities, preventing damage from motor overloads and ground faults.
- Renewable Energy: Integrates with solar and wind farm inverters to protect against fault currents and ensure grid stability.
Related Products
- ABB SPAJ141C: Enhanced version with advanced metering and harmonic analysis capabilities, suitable for modern smart grids.
- ABB SPAJ142C: Includes additional voltage protection functions, ideal for applications requiring combined overcurrent and voltage monitoring.
- SPA-ZC 17 BB/MM: Fiber optic bus modules enabling high-speed communication with other ABB relays and control systems.
- ABB REF542Plus: High-end protection relay with advanced diagnostic features, serving as a scalable alternative for complex networks.
- ABB UNITROL 6800: Motor control center protection device complementary to the ABB SPAJ140C in motor-driven systems.
Installation and Maintenance
Installation Preparation:
Ensure the relay is mounted in a dry, well-ventilated enclosure. Connect CT secondary circuits (1A/5A) and auxiliary power (80–265 V AC/DC) according to the wiring diagram. Use the front-panel keypad or ABB’s Relay Toolbox software to configure protection settings, including pickup currents, time delays, and communication parameters. Verify proper grounding and secure connections to prevent electromagnetic interference.
Ensure the relay is mounted in a dry, well-ventilated enclosure. Connect CT secondary circuits (1A/5A) and auxiliary power (80–265 V AC/DC) according to the wiring diagram. Use the front-panel keypad or ABB’s Relay Toolbox software to configure protection settings, including pickup currents, time delays, and communication parameters. Verify proper grounding and secure connections to prevent electromagnetic interference.
Maintenance Recommendations:
Regularly inspect the ABB SPAJ140C for loose connections or physical damage. Clean dust from the enclosure to maintain optimal thermal performance. Perform periodic functional tests to validate protection responses and update firmware to address security vulnerabilities. Replace faulty modules promptly using hot-swap procedures (if applicable) to minimize downtime.
Regularly inspect the ABB SPAJ140C for loose connections or physical damage. Clean dust from the enclosure to maintain optimal thermal performance. Perform periodic functional tests to validate protection responses and update firmware to address security vulnerabilities. Replace faulty modules promptly using hot-swap procedures (if applicable) to minimize downtime.
Product Warranty and Support
The ABB SPAJ140C is backed by a 1-year warranty covering defects in materials and workmanship. ABB’s global support network offers 24/7 technical assistance, including remote diagnostics, firmware updates, and field service. Certified partners provide rapid replacement and repair services, ensuring minimal disruption to operations. All relays undergo rigorous testing to meet ISO 9001 and IEC standards, guaranteeing long-term reliability in critical applications.
HS:8471800000
Contact info
- WhatsApp: +86 18030182217
- Email: sandydcsplc@gmail.com
- Phone: +86 18030182217
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