ABB REJ603 REJ603BBB10NN3XC Self Powered Feeder Protection Relay

The ABB REJ603 REJ603BBB10NN3XC is a self-powered feeder protection relay specifically developed for secondary distribution networks in medium-voltage systems. As part of ABB’s well-established Relion® 600 series, this model excels in delivering robust overcurrent protection functions without the need for an external auxiliary power supply, making it ideal for installation in environments with limited access to auxiliary voltage sources.

Designed to derive power directly from current transformers, this device is tailored for ring main units (RMUs), compact substations, and distribution automation projects. Its high reliability, compact footprint, and capability to function independently in harsh field conditions position it as a go-to protection solution in modern power distribution schemes.

Product Specifications

Product Applications

The ABB REJ603BBB10NN3XC is particularly suited for medium-voltage secondary distribution systems. Typical application scenarios include:

• Ring Main Units (RMUs) in substations where auxiliary power is unavailable

• Compact Secondary Substations in urban and rural networks

• Overhead line protection in isolated regions

• Industrial feeders with strict power independence requirements

• Smart grid modernization projects requiring decentralized and autonomous protection

• Backup protection for feeders, motors, and small transformers

Product Advantages

• True Self-Powered Operation

  No need for external auxiliary voltage—draws operating energy from the current transformer input, ensuring uninterrupted performance in isolated environments.

• Fast Fault Detection

  Incorporates high-speed trip logic to minimize fault clearance time and equipment damage.

• Simple and Robust Configuration

  DIP switches allow for on-site configuration without software or tools, ideal for utilities seeking fast commissioning.

• Compact and Durable Design

  Small footprint and rugged enclosure fit well in compact switchgear panels with high mechanical durability.

• Low Burden on CTs

  Optimized design minimizes the power drawn from CTs, preserving accuracy and reducing thermal stress.

• No Maintenance Operation

  With no batteries, moving parts, or displays to degrade, the device ensures long-term reliability in harsh field conditions.

• High Immunity to Electrical Noise

  Excellent EMC performance ensures stable operation in high-interference industrial zones.

• Cost-Effective Protection Solution

  Reduces installation and operational costs by eliminating the need for auxiliary wiring and backup power.

FAQ

1. How does the REJ603BBB10NN3XC power itself without external supply?

   It uses the energy from line current via CT inputs to internally generate the power required for protection logic and trip output.

2. What is the minimum current level required to initiate operation?

   Typically around 0.6–0.8 times In (nominal current), depending on burden and CT parameters.

3. Does the relay offer protection during cold start (zero auxiliary power)?

   Yes, the relay is designed to cold-start using fault current and perform tripping based on pre-configured settings.

4. Can the settings be modified in the field?

   Yes, using onboard DIP switches or optional PC-based configuration interface via serial port (model dependent).

5. Is there a time delay for trip function activation after energization?

   The relay performs immediate energization and operation upon reaching the startup threshold, with user-configurable time delays.

6. Can the relay handle short duration inrush currents?

   Yes, the relay includes inrush blocking features to avoid unnecessary tripping during transformer energization.

7. Is it possible to use this relay in radial as well as looped distribution networks?

   Yes, it is applicable in both configurations and especially suitable for looped networks with no central auxiliary supply.

8. Does the relay support directional earth fault protection?

   No, the REJ603BBB10NN3XC is intended for non-directional protection only.

9. What trip output contact is available in self-powered mode?

   A normally open (NO) output contact is available, energized via internally generated power during fault conditions.

10. Is it compatible with external communication or SCADA systems?

    In this base model, communication is not included. However, variants with Modbus or IEC 60870-5-103 interfaces may be available on request.