ABB RET615E_H Relion® 615 series Digital Protection Relay

Digital Protection Relay for Transformer and Teleprotection Applications

1. Core Identity

Manufacturer: ABB (global leader in power systems and automation).

Product Line: Relion® 615 series (advanced protection and control devices).

Hardware Platform: RET615E (E-generation hardware).

Variant Suffix: H (typically denotes High-precision analog inputs for critical measurements).

2. Primary Functions

The RET615E_H is engineered for transformer protection with integrated teleprotection schemes:

Transformer Differential Protection:

High-speed detection of internal faults via current differential algorithms.

Supports harmonic restraint (2nd/5th harmonics) to block tripping during inrush conditions.

Teleprotection (Distance Protection + Communication-Assisted Schemes):

Distance Protection (Zones 1–6): Backup for transmission line faults.

Communications-Assisted Tripping:

Direct Transfer Trip (DTT)

Permissive Overreach Transfer Trip (POTT)

Blocking Schemes (e.g., DCB, POTT) via fiber/communication channels.

Integrated Backup Protections:

Overcurrent (phase/ground), thermal overload (IEC/ANSI),

Voltage/frequency protection, breaker failure, autoreclosing.

3. Key Features of the "H" Variant

High-Accuracy Analog Inputs:

Equipped with High Core Current Transformers (HCTs) for precise current sampling (critical for differential protection).

Advanced Communication:

IEC 61850 (Ed. 2: GOOSE, MMS, Sampled Values)

IEC 60870-5-103/104, DNP3.0, Modbus

IEEE C37.94 (fiber-based teleprotection signaling).

Synchrophasor Support:

Optional PMU (Phasor Measurement Unit) functionality for grid monitoring (IEEE C37.118).

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

Software: Configurable via ABB’s PCM600 engineering tool.

4. Technical Specifications

Parameter Detail

Protection Differential, distance, overcurrent, voltage, frequency, BF protection.

I/O Capacity Configurable digital I/O modules (up to 24 inputs/16 outputs).

Communication 2x Ethernet, 2x optical ports, serial ports (RS485/RS232).

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

Operating Temp -40°C to +85°C (industrial-grade robustness).

5. Typical Applications

Primary Protection:

Power transformers (2-winding/3-winding) in substations.

Teleprotection:

High-voltage transmission lines requiring communication-based schemes.

Backup Protection:

Combined transformer + line protection in grid automation systems.

Renewable Integration:

Wind/solar farm step-up transformer protection.

6. Differentiation from REQ615E_H

While both belong to the 615 series:

RET615E_H focuses on transformer protection + teleprotection/distance schemes.

REQ615E_H emphasizes pure transformer differential protection (no distance functions).

Summary

The ABB RET615E_H is a multifunctional protection relay merging transformer differential protection with advanced teleprotection capabilities. Its H suffix signifies high-accuracy measurement hardware, making it ideal for critical applications requiring precise fault detection and communication-assisted tripping. For exact configurations, consult ABB’s "RET615 Technical Manual" or datasheets (search: 1MRK 504 088-BEN).