Application Scenarios:

Consider a critical 33kV underground cable feeder connecting a wind farm to the main grid substation.A fault anywhere on this line must be isolated instantaneously to protect expensive equipment and maintain grid stability,but traditional overcurrent protection may be too slow or lack selectivity.The solution involves installing an ABB RET615E-1G​relay at each end of the cable.Using a direct fiber-optic link,the relays continuously exchange synchronized current measurements.The RET615E-1G’s differential protection algorithm instantly compares these values;any significant difference indicates an internal fault,triggering a simultaneous,ultra-fast trip at both ends within one power cycle.This application of the RET615E-1G​provides absolute selectivity,protecting the entire cable while remaining stable for external faults,ensuring maximum reliability for renewable energy integration.

Parameter:

Main Parameters

Value/Description

Product Model​

RET615E-1G​

Manufacturer​

ABB

Product Category​

Line Differential&Feeder Protection IED(Bay Controller)

Primary Protection​

High-speed line current differential,Directional/Non-directional overcurrent,Autorecloser

Measurement Inputs​

5 current(5A/1A),5 voltage inputs(100-120V)

Communication Protocols

IEC 61850​(MMS,GOOSE),IEC 60870-5-103/104,DNP3,Modbus

Differential Channel

Dedicated fiber-optic port for peer-to-peer relay communication

Binary I/O​

Configurable digital inputs&outputs for control and interlocking

Human-Machine Interface

Large graphical LCD,keypad,and LED indicators

Power Supply​

Wide-range 24-250V DC/110-240V AC

Standards&Certifications

IEC 60255,IEEE C37.94,IEC 61850 Ed.2,KEMA,UL

Technical Principles and Innovative Values:

Innovation Point 1:Peer-to-Peer Synchronized Sampling for Absolute Speed.The core innovation of the RET615E-1G​lies in its implementation of line differential protection.It uses a precise,proprietary sampling synchronization algorithm over its direct fiber link with the remote relay.This allows both relays to take current measurements at the exact same instant,enabling a true comparison.The differential element calculates a”restraint”and”operate”current;an internal fault creates a high operate current relative to restraint,triggering a trip.This method provides unit protection—it operates only for faults within the protected zone(the cable between relays)—making it inherently selective and extremely fast,clearing faults in as little as 15-20 ms.

Innovation Point 2:IEC 61850 Native Integration for Simplified Engineering.The RET615E-1G​is designed as a native IEC 61850 device.It comes with a standardized ICD(IED Capability Description)file.This allows it to be seamlessly integrated into modern digital substations using System Configuration Tools(SCT).Logical nodes,data sets,and GOOSE(Generic Object Oriented Substation Event)messages for inter-relay communication or breaker control can be configured graphically,eliminating thousands of hardwired signals and drastically reducing engineering,wiring,and commissioning time compared to traditional schemes.

Innovation Point 3:Integrated Bay Control for Reduced Footprint.Beyond pure protection,the RET615E-1G​consolidates multiple functions into one device.It acts as a full bay controller,handling not only differential and overcurrent protection but also integrating an auto-recloser for overhead lines,extensive sequence of events(SOE)recording,disturbance recording(COMTRADE),and control functions for circuit breakers,disconnectors,and earthing switches.This integration reduces the number of separate devices in the control cabinet,saving space,cost,and complexity.

Application Cases and Industry Value:

Case Study:Refinery Medium-Voltage Distribution Network Upgrade.A large oil refinery experienced recurring nuisance trips on its interconnected 13.8kV feeder rings during motor starts,causing costly process shutdowns.The existing overcurrent protection could not distinguish between a healthy inrush current and a genuine fault.

The refinery deployed the ABB RET615E-1G​in a pilot-wire differential scheme on the most critical ring main feeders.The relays’high-set differential element was set above any possible inrush current,while their directional overcurrent backup provided coordination.The result was a complete elimination of false trips during motor starting.Furthermore,when an actual cable fault occurred,the RET615E-1G​cleared it in 18ms,limiting damage.The integrated disturbance recorder provided clear fault waveforms for analysis.The project lead reported a 40%reduction in unplanned feeder outages and estimated a 2-year ROI due to avoided production losses,highlighting the relay’s value in ensuring process continuity and asset protection in critical industrial power distribution.

Related Product Combination Solutions:

The RET615E-1G​is part of a comprehensive Relion®protection ecosystem.Key related products include:

Transformer Protection:​The RET670​or REx670​relays for protecting power transformers with differential,restricted earth fault,and overcurrent protection.

Busbar Protection:​The REB670​relay for fast,selective protection of substation busbars using high-impedance or low-impedance differential principles.

Motor Protection:​The REM615​relay,designed specifically for the comprehensive protection of medium-voltage motors.

Generator Protection:​The REG670​relay for full protection of generators and generator-transformers blocks.

Communication&Gateway:​The RES670​or RED670​devices can act as communication gateways or for additional feeder/bay protection,complementing the RET615E-1G​in complex substations.

HMI&Local Control:​The REC650​bay control unit or the LOC650​local operator panel for a dedicated local control interface.

Engineering Tools:​ABB PCM600​is the universal engineering tool for configuring,setting,and monitoring all Relion®600 series devices,including the RET615E-1G.

Installation,Maintenance,and Full-Cycle Support:

Installation involves mounting the RET615E-1G​on a standard DIN rail or panel,connecting the AC current and voltage transformer circuits,the DC/AC power supply,and the binary I/O for control.The critical step is establishing the fiber-optic link between paired relays for differential protection,ensuring proper cable type and connector cleaning.Commissioning is streamlined using PCM600 software,which allows for easy setting of protection parameters,configuration of IEC 61850 communication,and functional testing via simulation.

Routine maintenance is minimal due to the relay’s solid-state design.Key activities include verifying the health status via the front HMI or remotely,checking the fiber-optic link budget,and ensuring clock synchronization(e.g.,via IRIG-B or SNTP).The device provides extensive self-diagnostics and detailed event logs.In the rare event of a failure,the modular design allows for efficient replacement.We provide end-to-end support for the RET615E-1G.Our units are sourced from certified channels and undergo a rigorous QA process including visual inspection,power-on self-test verification,and basic communication checks.We offer a comprehensive warranty and back our products with deep technical expertise to assist with configuration,integration into your system,and lifecycle management,ensuring your protection schemes remain reliable and compliant.

Looking to implement fast,selective,and modern protection for your critical feeders?Contact us for expert application support and reliable sourcing for the ABB RET615E-1G and the complete Relion®protection suite.

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