ABB RET670 Transmission Transformer Protection

Application

• Transformer Differential Protection: Detects internal phase-to-phase and phase-to-earth faults in transformers.
• Local and Remote Apparatus Control: Enables control of transformer-related operations.
• Secure Interlocking: Prevents dangerous or damaging switchgear operations and ensures personnel safety.

Protection Functions

• Differential Protection: Provides fast and selective protection for internal faults.
• CT Saturation and Inrush Current Restraint: Avoids unnecessary tripping during external faults.
• 5th Harmonic Restraint: Prevents tripping due to transformer overexcitation.
• Sensitive Differential Protection: Detects low-level internal faults based on amplitude measurements.
• Temporary Desensitization: Allows differential protection to be temporarily desensitized during external faults by adding a DC component to the pickup level.

Additional Features

• IEC 61850 Communication Protocol Support: Enables interoperability and communication with other devices in the substation.