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ABB 1MRK004816-AC

Overview

The RET670 1MRK004816-AC provides fast and selective protection for two- and three-winding transformers, autotransformers, generator-transformer blocks, phase-shifting transformers, railway transformers, and shunt reactors.

It is widely used in:

• Power generation plants
• Transmission & distribution substations
• Industrial power systems (oil & gas, mining, petrochemical)

Key Features

Advanced Differential Protection

• Low-impedance transformer differential protection
• Works reliably across wide frequency variations
• Supports multi-breaker arrangements with up to six restraint CT inputs
• Harmonic restraint to avoid unwanted trips:
  • 2nd harmonic → inrush blocking
  • 5th harmonic → overexcitation blocking

Sensitive Fault Detection

• High sensitivity for internal faults using negative-sequence directional comparison
• Restricted earth-fault protection for winding faults
• High-impedance differential protection option

Monitoring & Control

• Integrated control and monitoring functions
• Supports communication with SCADA and substation automation systems
• Programmable and configurable for application-specific protection schemes

Typical Technical Data (General)

(Configuration-dependent)

• Supply options: 24 VDC or 230 VAC
• Operating temperature: −20°C to +55°C
• Designed for harsh industrial environments
• Supports IEC 61850 and modern substation communication (series capability)

Main Functions in Substations

The RET670 is often used as the primary protection relay for:

• Transformer differential protection
• Overcurrent & overload protection
• Earth-fault protection
• Monitoring and control of breakers and switches
• Event recording and disturbance analysis

Summary

ABB 1MRK004816-AC (RET670) is a high-end transformer protection relay combining protection, control, monitoring, and communication in one device. It is designed for critical power system reliability, offering fast fault detection, advanced filtering against false trips, and full integration into digital substations.