ABB REQ615E_G digital protection relay Relion® product family 615 series

This is a protection relay manufactured by ABB, a global leader in power and automation technologies. It belongs to the Relion® product family and is part of the 615 series, specifically designed for electrical system protection.

Key Information:

Hardware Platform: REQ615E

The REQ615E denotes the hardware generation/platform of this relay within the 615 series.

The suffix G typically indicates a specific hardware variant or configuration within the REQ615E platform. While exact details require consulting the official manual or datasheet, the G generally signifies:

A standard or common configuration of the REQ615E hardware.

Specific factory-set options for I/O modules (number/types of inputs/outputs).

Specific standard communication interfaces (e.g., combination of Ethernet, optical, or serial ports).

A specific power supply voltage range.

(Unlike the H suffix often associated with High-precision CT inputs for differential protection, the G is generally a more standard variant).

Core Functionality (Typical for REQ615 Platform):

The primary design purpose of the REQ615 series is Transformer Differential Protection. The REQ615E_G is fundamentally a Transformer Protection Relay.

It provides fast and reliable differential protection for power transformers (especially small to medium-sized units) by comparing the vector sum of currents entering and leaving the protected zone.

Integrated Backup Protection: Alongside the core differential function, it usually incorporates comprehensive backup protection features, such as:

Phase Overcurrent Protection (I>, I>>)

Earth Fault / Zero-Sequence Overcurrent Protection (I0>, I0>>)

Overload Protection / Alarm (Thermal replica based on IEC 60255-8 / ANSI 49)

Under/Overvoltage Protection (U<, U>)

Under/Overfrequency Protection (f<, f>)

Breaker Failure Protection (BFP)

Inrush Restraint / Harmonic Blocking (for transformer energization)

Key Features & Advantages:

High Reliability: Engineered for critical protection, meeting international standards (IEC 60255, IEEE C37.90).

Multifunction Integration: Combines primary differential protection and essential backup functions in a single device, optimizing panel space and cost.

Flexibility: Configurable protection functions, control logic, and signal routing.

Advanced Communication: Supports key industrial protocols for seamless integration into substation automation (SA) systems:

IEC 61850 (GOOSE, MMS, Sampled Values - typically Edition 1 or 2 depending on firmware)

IEC 60870-5-103

Modbus® (RTU over serial or TCP/IP over Ethernet)

DNP3.0 (Serial or TCP/IP)

User Interface: Equipped with a graphical LCD display and keypad for local control, monitoring, and settings. Compatible with ABB's PCM600 engineering tool for configuration, testing, and diagnostics.

Robust Design: Built for demanding substation environments (high EMC immunity, wide operating temperature range).

Typical Applications:

Primary and backup protection for two-winding and three-winding power transformers.

Protection of industrial power distribution systems.

Applications in substations, power plants, and renewable energy integration points requiring integrated transformer protection.

Summary:

The ABB REQ615E_G is a digital protection relay based on the REQ615E hardware platform, primarily designed for transformer differential protection of small to medium-sized units. The G suffix denotes a specific standard hardware configuration variant within this platform. It integrates differential protection with essential backup functions and offers robust communication capabilities, making it a versatile solution for protecting transformers in various power system applications.