ABB RET615E_G protection relay Relion® 615 series

1. Core Identity

Series: Relion® 615

Hardware Platform: RET615E

Suffix "G": Denotes standard hardware configuration (default I/O, communication, and measurement).

Key Focus: Integrated transformer protection + distance-based teleprotection.

2. Core Functions

Protection Description

Transformer Diff. High-speed differential protection (87T) with harmonic restraint.

Distance Protection Zones 1–6 backup for lines/feeders (<1 ms operating time).

Teleprotection Communication-assisted schemes (POTT, DCB, DTT) via fiber/IEC 61850 GOOSE.

Backup Protections Overcurrent (50/51), Earth Fault (50N/51N), Breaker Failure (50BF), Voltage/Frequency (27/59, 81), Thermal Overload (49).

3. Key Features

Hardware ("G" Specific):

Standard-precision analog inputs (CTs/VTs) – suitable for most grid applications.

Default I/O: Typically 16 digital inputs / 10 digital outputs (configurable).

Communication:

Dual Ethernet ports (IEC 61850 Ed.2, DNP3.0 TCP, Modbus TCP).

Optical ports (IEC 61850-9-2 LE Sampled Values, IEEE C37.94 teleprotection).

Serial ports (IEC 60870-5-103, Modbus RTU).

Local HMI: Graphical LCD, keypad, and LED indicators for status/diagnostics.

Software: Fully configurable via ABB PCM600 (protection logic, schemes, HMI).

4. Technical Specifications

Parameter RET615E_G

Standards IEC 60255, IEEE C37.90, IEC 61000-4 (EMC)

Operating Temp -40°C to +85°C

IEC 61850 Support GOOSE, MMS, Sampled Values (SV)

Measurement Standard accuracy: ±0.5% (current), ±0.2% (voltage)

Ordering Code Typically 1MRK 504 085-BEN (verify datasheet)

5. Typical Applications

Substations: Backup protection for transformers + outgoing lines.

Grid Automation: Teleprotection for transmission lines (≤245 kV).

Industrial Plants: Main protection for critical transformers.

Renewables: Step-up transformer protection in wind/solar farms.

6. Differentiation from Other Variants

Model Key Difference

RET615E_H High-precision CTs (HCTs) for critical measurements

RET615E_V Enhanced voltage measurement (e.g., for generator)

REQ615E_* No distance protection (pure transformer focus)

Summary

The ABB RET615E_G is a versatile protection relay combining transformer differential protection, distance-based backup, and teleprotection schemes. Its "G" suffix designates a standard hardware configuration suitable for most grid and industrial applications. While lacking the ultra-high precision of the "H" variant, it delivers robust performance with full IEC 61850 compliance and flexible I/O.