This is the technical manual for the ABB Relion® 650 series transformer protection device, model RET650.
The document serves as a comprehensive technical guide for the ABB Relion® 650 Series Transformer Protection device, specifically the RET650 model. It details the product's functions, operating principles, and safety information.
The manual covers various protection schemes including differential protection (for two-winding and three-winding transformers), low-impedance earth fault protection, and current-based protections such as phase overcurrent and zero-sequence overcurrent. It also describes local human-machine interface (LHMI) features, control functions, and communication capabilities. This manual is written in Chinese.
| Accuracy for differential current < Ir | ± 1.0% Ir |
|---|---|
| Return coefficient | > 95% |
| Operating time for differential protection (with restraint) | 20 ms typical |
The accuracy is ± 1.0% Ir.
The typical operating time is 20 ms.