REF620 NBFNAANNNDA1BBN1XF Premium Transformer Protection Relay

Description

The REF620 NBFNAANNNDA1BBN1XF functions as a premium numerical protection relay specifically designed for power and distribution transformers. It occupies a critical position in substation automation stacks, combining specialized protection algorithms, comprehensive monitoring, and advanced communication capabilities in a single device.

This relay connects to current transformers on both primary and secondary sides of the transformer, enabling differential protection—a key feature for detecting internal faults that may not be visible to traditional overcurrent relays. It continuously analyzes electrical parameters including current, voltage, power, and temperature, applying transformer-specific logic to identify conditions like overexcitation, overload, and winding faults. The REF620 NBFNAANNNDA1BBN1XF integrates seamlessly with digital substations through IEC 61850 communication, supporting sampled values and GOOSE messaging for interoperability with other intelligent devices. Its modular design allows customization with optional function blocks, adapting to various transformer types including two-winding, three-winding, and autotransformers.

Main features and advantages:

Engineered for the most demanding transformer protection applications, the REF620 NBFNAANNNDA1BBN1XF delivers exceptional reliability and precision. Its robust hardware design withstands extreme environmental conditions, including wide temperature variations, voltage transients, and electromagnetic interference common in substation environments. The relay’s advanced signal processing algorithms filter out noise and transients, ensuring accurate fault detection even in complex networks with high harmonic content or variable load conditions.

The REF620 NBFNAANNNDA1BBN1XF offers significant value through its transformer-specific feature set. Differential protection with adaptive restraint ensures reliable detection of internal faults while remaining stable during external faults and through-fault conditions. Built-in thermal modeling tracks transformer winding temperature, preventing insulation damage from prolonged overloads. Advanced diagnostics provide detailed insights into transformer health, including insulation condition monitoring and load profile analysis, enabling predictive maintenance that extends equipment lifespan. For utilities and industrial facilities, this translates to reduced downtime, lower maintenance costs, and enhanced protection of critical transformer assets.

Application areas:

The REF620 NBFNAANNNDA1BBN1XF is ideally suited for protecting transformers in critical power infrastructure. In utility substations, it safeguards distribution and power transformers, ensuring reliable electricity delivery to residential, commercial, and industrial customers. Its differential protection capabilities quickly isolate internal faults, preventing catastrophic transformer failure and minimizing service disruptions.

In industrial plants with on-site transformers, such as chemical facilities and manufacturing complexes, the relay protects essential power conversion equipment, supporting uninterrupted production. Its thermal monitoring features prevent overload-related damage to transformers serving critical processes, while advanced communication allows integration with plant-wide automation systems for centralized monitoring.

Related products:

In renewable energy installations, including wind farms and solar parks, the REF620 NBFNAANNNDA1BBN1XF protects step-up transformers connecting generation assets to the grid. Its ability to handle variable load conditions and integrate with smart grid systems makes it essential for maintaining grid stability with increasing renewable penetration.

REF615C_C HCFFAEAGANB2BAN1XC – Feeder protection relay for companion use in transformer feeder circuits.

REF620-ADV – Advanced version with additional arc flash protection and busbar protection features.

REF650 – Feeder protection relay with smart grid capabilities for transformer secondary circuits.

RET670 – Substation automation controller that integrates with REF620 for comprehensive substation management.

REF620-LT – Light version with reduced features for less critical transformer applications.

REL670 – Legacy transformer protection relay, upgrade path to REF620 for modernization projects.

REF542plus – Older generation relay compatible with REF620 in mixed installations during upgrades.

REF620-COMM – Communication expansion module for enhanced protocol support in complex networks.

Installation and maintenance:

Before installing the REF620 NBFNAANNNDA1BBN1XF, verify that current transformer ratios and connection configurations match the transformer’s winding arrangement (delta/wye) to ensure accurate differential protection. Confirm control power compatibility and ensure proper isolation from high-voltage components. For digital substation integration, validate IEC 61850 configuration, including data set definitions and GOOSE message mappings with other substation devices.

For ongoing maintenance, utilize the relay’s advanced diagnostic capabilities by scheduling monthly reviews of transformer health metrics and fault records. Perform quarterly inspections of connections and terminal blocks to check for corrosion or tightness. Calibrate current transformer inputs annually using certified test equipment to maintain differential protection accuracy. Regularly backup configuration files and apply firmware updates approved for the REF620 NBFNAANNNDA1BBN1XF to ensure compatibility with the latest protection algorithms and security enhancements.

Other ABB product models:

ABB 745745
ABB 746376
ABB 07AC91
ABB 07KR31 FPR36000227R1202-O
ABB 07KT92
ABB 07KT92 GJR5250500R0202
ABB 07KT93
ABB 07KT93
ABB 07KT93 GJR5251300R0101
ABB 07KT94 GJR5252100R3261
ABB 07kt94g   GJR5252100R0261
ABB 07KT94-S H3 GJR5252100R2201
ABB 07KT98 GJR5253100r0272
ABB 07KT98 GJR5253100R0272
ABB 07KT98 GJR5253100R0272
ABB 07MK92 GJR5253300R1161
ABB 086318-002
ABB 086329-004
ABB 086329-004
ABB 086329-004 includes SMI board (806339-001)
ABB 086339-501
ABB 086345-504
ABB 086348-001
ABB 086348-001
ABB 086348-001
ABB 086351-003
ABB 086351-004-C
ABB 086362-001
ABB 086362-001
ABB 086370-001
ABB 086370-001
ABB 086444-005
ABB 086444-005
ABB 086444-005
ABB 128057-204 086345-504 frame
ABB 129740-002
ABB 129740-002
ABB 129740-002
ABB 1336-BDB-SP79D
ABB 16NG63A HESG441635R1 HESG216879/K
ABB 1756-L72
ABB 1KHL178016R0001F PSM03
ABB 1KHL178016R0001F PSM03
ABB 1KHL178016R0001F PSM03
ABB 1KHL178025R0102P COM02
ABB 1KHL178025R0102P COM02
ABB 1KHL178025R0102P COM02
ABB 1MRB150005R1/P
ABB 1MRK000005-380 REG670
ABB 1MRK000508-BD
ABB 1MRK000508-CDr09
ABB 1MRK002122-ABR02
ABB 1MRK002238-CA
ABB 1MRK002311-AAR02
ABB 1MRK002311-AAR02
ABB 1MRK002816-AC
ABB 1MRK004810   RED670
ABB 1MRK004816-AB RET670
ABB 1SAJ520000R0101 1SAJ520000R0101 UMC100-FBP.0 A4
ABB 1SCA022079R9050
ABB 1SCA022079R9050 OETL-ZT80A220AC
ABB 1SDA-051116-R1
ABB 1SDA060537R1
ABB 1SDA071666R1
ABB 1SFA619550R1071
ABB 1SVR730830R0400
ABB 1SVR730840R0300
ABB 1TGB302004R5003