Product Description
🔹 Product Overview
|
Category |
Details |
|---|---|
|
Manufacturer |
ABB |
|
Model/Part Number |
RET521 |
|
Description |
Transformer Differential Protection Terminal for advanced control and protection of power transformers within distributed control systems |
|
Key Features |
Differential protection (87T), restricted earth fault (87N), overcurrent backup (50/51), fiber optic communication, robust design, event recording |
🔹 Technical Specifications
|
Specification |
Details |
|---|---|
|
Model |
RET521 |
|
Product Type |
Transformer Protection Terminal |
|
Series |
Relion (Legacy Series) |
|
Power Supply |
24–60 VDC or 110–250 VDC / 100–240 VAC |
|
Protection Functions |
87T (Differential), 87N (REF), 50/51 (Overcurrent) |
|
Inputs |
CTs, VTs, Binary Inputs |
|
Outputs |
Multiple tripping and signaling relays |
|
Communication |
Fiber optic, RS485/RS232 (optional), Modbus |
|
Operating Temperature |
-25°C to +55°C (-13°F to +131°F) |
|
Weight |
Approx. 4–5 kg (8.8–11 lbs), depending on configuration |
🔹 External Connection Options
|
Connection Type |
Details |
|---|---|
|
Supported Connections |
Fiber optic for inter-relay communication; RS485/RS232 for system interface; Terminal blocks for CT/VT and binary I/O |
🔹 Functional Features
|
Feature |
Details |
|---|---|
|
Protection |
Fast differential protection, restricted earth fault, backup overcurrent |
|
Monitoring |
Event logging, fault recording, and continuous self-diagnostics |
|
Control |
Local and remote transformer protection management |
|
Software |
Fully compatible with ABB PCM600 for configuration, firmware, and diagnostics |
🔹 Model and Configuration
|
Category |
Details |
|---|---|
|
Base Model |
RET521 |
|
Configuration |
Configurable via PCM600; variants include expanded I/Os, communication protocols |
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