ABB REL670

ABB REL670 is an advanced **line differential protection relay** developed by ABB, part of its **RELion® protection and control product series**. Designed for medium- and high-voltage power systems, it delivers highly reliable protection, monitoring, and control functions. Below are its key features and applications:  

### **1. Key Functions**  
- **Line Differential Protection**:  
  Utilizes high-performance differential algorithms (e.g., sampled value differential) to provide fast and reliable line protection, suitable for both short lines and long-distance transmission lines.  
- **Backup Protection Functions**:  
  Includes distance protection, directional overcurrent protection, zero-sequence protection, etc., ensuring system safety in case of primary protection failure.  
- **Fault Location and Distance Measurement**:  
  Accurately identifies fault locations to minimize recovery time.  
- **Adaptive Protection**:  
  Automatically adjusts protection parameters based on system conditions (e.g., load variations, topology changes).  
- **Communication Support**:  
  Supports IEC 61850 (GOOSE, SV), IEC 60870-5-103/104, DNP3.0, and other protocols for seamless integration with SCADA or other intelligent devices.  

### **2. Technical Features**  
- **Hardware Platform**:  
  Modular design with support for multiple I/O configurations, including analog inputs, digital inputs/outputs, and fiber-optic interfaces.  
- **High Sampling Rate**:  
  High-precision AD conversion and rapid data processing ensure quick and accurate protection responses.  
- **Real-Time Monitoring and Recording**:  
  Built-in fault recording (COMTRADE format) and event logging for simplified fault analysis.  
- **Human-Machine Interface (HMI)**:  
  Equipped with an LCD display and keypad for local operation, configurable via PC software (e.g., ABB PCM600).  

### **3. Typical Applications**  
- **Transmission Line Protection**:  
  Suitable for overhead lines or cables at 110kV and above.  
- **Substation Automation**:  
  Serves as a core protection unit in smart substations, supporting IEC 61850 communication.  
- **Renewable Energy Integration**:  
  Adapts to grid connection protection requirements for distributed energy sources like wind and solar power.  

### **4. Advantages**  
- **High Reliability**: Redundant design and rigorous testing (e.g., IEC 60255 certification).  
- **Flexibility**: Supports multiple protection schemes and communication protocols for diverse grid architectures.  
- **Ease of Maintenance**: Comprehensive diagnostic tools and remote management capabilities.  

### **5. Related Models**  
- **REL670**: Focused on line differential protection.  
- **REF670**: Designed for feeder protection.  
- **RET670**: Specialized in transformer protection.  

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