Overview

The ABB RK638007-BA Comparator Unit, designated as RLHE 103, is a critical component within ABB’s REB103 busbar protection architecture. Engineered for high-voltage applications, this unit performs real-time analog current comparison across multiple busbar sections. Moreover, it enhances fault detection accuracy and supports fast tripping logic, ensuring minimal disruption during fault events.

Manufactured in Sweden, the RK638007-BA is built to meet the rigorous demands of utility-grade substations. Its robust enclosure and precision circuitry allow for stable operation in environments with high electromagnetic interference. In addition, the unit integrates seamlessly with ABB’s legacy protection systems, making it ideal for retrofit projects and long-term infrastructure support.

Technical Data

Typical Applications

• 500 kV and 220 kV Substations: Used in high-voltage substations for precise fault discrimination and current comparison.

• REB103 Protection Systems: Integral to ABB’s REB103 relay system, enabling differential protection across multiple busbar zones.

• Utility Grid Infrastructure: Deployed by utilities to enhance fault response and reduce outage durations.

• Industrial Power Distribution: Suitable for large industrial facilities with complex switchgear configurations.

• Legacy System Support: Ideal for maintaining and upgrading existing ABB protection schemes with minimal disruption.

For example, the RK638007-BA has been widely adopted in European transmission networks to improve fault detection speed and reliability. Additionally, its analog comparison method ensures low-latency response, which is critical for high-speed protection systems.

FAQ

Q: What is the role of the RK638007-BA in REB103 systems?
A: It performs analog current comparison to detect differential faults across busbar sections.

Q: Is this unit compatible with modern SCADA systems?
A: Yes, when integrated with REB103, it supports protocols like SPA and IEC 60870-5-103.

Q: Can it operate in outdoor substations?
A: Absolutely. Its IP54 rating and wide temperature range make it suitable for harsh environments.

Q: Is RK638007-BA still available for purchase?
A: Yes, it is stocked by multiple suppliers and supported by ABB’s legacy product services.

Q: What makes this unit suitable for high-voltage applications?
A: Its precision analog circuitry and fast response time ensure reliable fault detection in 220–500 kV systems.