AAB RET521 Transformer Protection Terminal

Description

The AAB RET521 is a transformer protection terminal designed for fast, selective, and reliable protection of power transformers in utility and industrial networks.

Specifications

• Application: Transformer differential and backup protection
• Rated Voltage: Supports common medium‑ and high‑voltage transformer applications
• Current Inputs: Multiple CT channels for differential and overcurrent functions
• Voltage Inputs: VT channels for voltage‑based protection and supervision
• Communication: IEC 61850, Modbus, and other standard protocols
• I/O Capacity: Configurable digital inputs and outputs for flexible integration
• Power Supply: Wide‑range auxiliary supply for stable operation
• Operating Environment: Designed for harsh substation conditions

Features

• Differential Protection: High‑speed, secure transformer differential algorithm
• Backup Protection: Overcurrent, earth‑fault, and voltage‑based protection functions
• Fault Recording: Event logs, disturbance records, and oscillography
• Self‑Supervision: Continuous internal diagnostics for reliability
• Flexible Configuration: Customizable logic and parameter settings
• Communication Support: Full IEC 61850 interoperability for modern substations