ABB RET670 1MRK004816-AB Transformer Protection Relay

The ABB RET670 1MRK004816-AB is a comprehensive transformer protection intelligent electronic device (IED) designed for high-end power system applications. It provides fast and accurate protection, control, and monitoring for power transformers, including autotransformers, phase-shifting transformers, generator-transformer units, and shunt reactors.

Product Applications

• Two- and three-winding power transformers

• Autotransformers with complex breaker arrangements

• Generator-transformer blocks and phase-shifting transformers

• Special railway transformers and shunt reactors

• Transformer bays in HV substations and small busbar systems

Key Advantages

• Differential protection with high sensitivity and fast response

• Built-in CT ratio matching and vector group compensation

• Supports restricted earth fault (REF), high impedance REF, and overexcitation protection

• Integrated synchrocheck, synchronizing, and auto-reclose functions

• Full distance protection for backup applications

• Extensive communication support (IEC 61850, SPA, LON, DNP3, etc.)

• Advanced logic and automation with graphical configuration tool

• Disturbance and event recording for post-fault analysis

• Suitable for both greenfield installations and retrofits

Technical Specifications

Frequently Asked Questions (FAQ)

Q1: What type of transformers can RET670 protect?

A1: RET670 is suitable for two- and three-winding transformers, autotransformers, phase-shifting transformers, shunt reactors, and generator-transformer units.

Q2: Does RET670 support high-speed tripping for internal faults?

A2: Yes, it includes fast differential protection and unrestrained high-set differential protection for high-speed fault clearing.

Q3: Can RET670 be used in a multi-breaker arrangement?

A3: Yes, it supports complex configurations with up to six CT inputs, suitable for multi-breaker and multi-terminal setups.

Q4: Is REF protection included in RET670?

A4: Yes, both low impedance and high impedance restricted earth fault (REF) protection are available.

Q5: Does RET670 support remote communication?

A5: Yes, it supports several communication protocols including IEC 61850, SPA, LON, DNP3, and IEC 60870-5-103.

Q6: Can it be used for backup distance protection?

A6: Yes, RET670 offers distance protection functions with mho or quadrilateral characteristics for backup purposes.

Q7: What are the synchronization capabilities?

A7: RET670 includes synchrocheck, synchronizing, and dead-line check functions with support for asynchronous network synchronization.

Q8: What monitoring features are available?

A8: It has built-in disturbance and event recorders for up to 40 analog and 96 binary signals, as well as metering and supervision functions.

Q9: Is RET670 suitable for retrofitting existing substations?

A9: Yes, its modular design and communication flexibility make it ideal for both new installations and retrofit projects.

Q10: How is local operation managed?

A10: A graphical local human-machine interface (HMI) with LED indicators, function keys, and LCD is provided for on-site control and monitoring.