ABB SPAJ110C

Description

Product Description

The ABB SPAJ110C is a specialized combined overcurrent and earth fault protection relay from ABB’s SPAJ series, designed for the protection of medium voltage feeders in distribution networks and industrial power systems. The SPAJ series has been extensively deployed worldwide in electrical substations and industrial power distribution applications over several decades. The core function of the ABB SPAJ110C is to provide three-phase overcurrent protection and sensitive earth fault protection for radial feeders. It continuously monitors the current in all three phases and the residual current (earth fault), and trips the associated circuit breaker when fault conditions are detected. The relay provides both definite time and inverse time overcurrent characteristics, allowing coordination with other protection devices in the network. The “C” suffix typically indicates a specific revision or variant of the base SPAJ110 design. Engineered for the demanding environments of electrical substations, the ABB SPAJ110C features robust construction, reliable performance, and user-friendly operation with front-panel controls and indicators.

Product Parameters

• Model Number: ABB SPAJ110C
• Type: Combined Overcurrent and Earth Fault Protection Relay
• Series: ABB SPAJ Series
• Application: Feeder protection in medium voltage distribution networks
• Protection Functions: Three-phase overcurrent (50/51), earth fault (50N/51N)
• Characteristics: Definite time and inverse time overcurrent curves
• Current Inputs: 1A or 5A CT secondaries
• Output Relays: Multiple output relays for trip and alarm
• Indication: Front-panel LED indicators for pickup and trip
• Controls: Front-panel switches and potentiometers for setting adjustments
• Communication: Serial communication options (optional)
• Power Supply: 24/48/60/110/220 VDC or 110/230 VAC
• Mounting: Flush mount in switchgear panels
• Operating Temperature: -10°C to +55°C
• Certification: CE, UL, CSA, IEC standards

Advantages and Features

The primary advantage of the ABB SPAJ110C lies in its reliable overcurrent and earth fault protection capabilities for medium voltage feeders. Using the ABB SPAJ110C, utilities and industrial facilities can ensure proper protection of distribution feeders, isolating faults quickly to minimize equipment damage and service interruption. The relay’s combined overcurrent and earth fault functions provide comprehensive protection in a single, compact unit. Front-panel controls and indicators allow easy setting adjustment and status monitoring without requiring external tools. The ABB SPAJ110C offers both definite time and inverse time characteristics, providing flexibility for coordination with other protection devices. Its robust construction ensures reliable operation in the harsh electromagnetic environment of substations.

Application Cases in Application Fields

The ABB SPAJ110C finds essential application in medium voltage distribution systems worldwide.

• Utility Distribution Substations: In a 33/11 kV distribution substation, the ABB SPAJ110C protects outgoing 11 kV feeders, providing overcurrent and earth fault protection with coordination with downstream fuses and reclosers.
• Industrial Power Distribution: At a manufacturing facility, the ABB SPAJ110C protects feeders supplying power to plant distribution transformers and large motor control centers.
• Mining Operations: In mining power systems, the ABB SPAJ110C provides feeder protection for underground and surface distribution networks.
• Commercial Buildings: In large commercial complexes with medium-voltage distribution, the ABB SPAJ110C protects main switchgear feeders.
• Infrastructure: At water treatment plants, the ABB SPAJ110C protects feeders supplying critical pumping loads.

Comparison with Competitor Products

When compared to similar feeder protection relays from other manufacturers such as Siemens (7SJ series) or Schneider Electric (Sepam series), the ABB SPAJ110C offers specific advantages for users invested in ABB’s protection ecosystem. It provides consistent performance and familiar operation for engineers accustomed to ABB’s SPAJ series. For facilities with existing ABB protection equipment, the ABB SPAJ110C ensures compatibility with existing schemes and simplifies spare parts management. While newer numerical relays offer more advanced features, the ABB SPAJ110C remains a reliable choice for applications where basic overcurrent protection is sufficient.

Selection Suggestions and Precautions

When selecting the ABB SPAJ110C for your application, first verify that the current input rating (1A or 5A) matches your CT secondaries. Confirm that the power supply voltage matches your station battery or auxiliary supply. When installing the ABB SPAJ110C in a switchgear panel, follow all applicable safety procedures. Ensure proper CT wiring with correct polarity. Configure the relay settings according to coordination studies, setting appropriate pickup levels and time delays. Test protection functions thoroughly during commissioning using secondary injection testing. For critical applications, maintain documentation of all settings and consider keeping a spare ABB SPAJ110C relay on hand to minimize downtime in case of failure.

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