ABB Relion ® REU615 Voltage Protection and Control Device



ABB Relion ®  REU615 Voltage Protection and Control Device

Product Overview

REU615 is ABB Relion ®  The 615 series of voltage protection and control intelligent electronic devices (IEDs) are suitable for voltage protection, automatic voltage regulation, and related control scenarios in medium voltage power grids. Its core features include:

Dual standard configuration:

Configuration A: Focused on voltage/frequency protection, synchronous inspection, and load shedding, suitable for power grids with distributed generation.

Configuration B: For automatic voltage regulation of transformers with load tap changers, it integrates overcurrent and thermal overload protection.

Hardware design: Adopting a withdrawable plug-in structure, supporting standard/wide size chassis, compatible with IEC 61850 communication protocol, supporting Rogowski current sensors and digital switch devices.

Core functions

Voltage protection function

Overvoltage/undervoltage protection: three-stage three-phase overvoltage (3U>), three-stage three-phase undervoltage (3U<), supporting positive/negative sequence voltage protection.

Residual voltage protection: three-stage residual voltage overvoltage (Uo>), used for ground fault detection.

Frequency protection: Six segment frequency protection (f>/f<), supporting frequency change rate (df/dt) monitoring, suitable for power grid stability control.

Control and regulation functions

SECRSYN: Supports synchronous grid connection of two power grids and outputs a closing permission signal.

On load tap changer control (OLATC): configured for B use, supports automatic/manual voltage regulation, and is compatible with parallel operation of multiple transformers.

Measurement and Monitoring

Disturbance Recorder (RDRE): Supports 12 analog channels (such as Uo, U1-U3) and digital input triggering to record fault waveforms.

Status monitoring: Trip circuit supervision (TCS), current/voltage circuit supervision, supporting RTD temperature measurement and motor thermal overload protection (49T).

Application scenarios

Typical Application of Configuration A

Voltage anomaly protection: used for protecting against voltage surges/dips and frequency offsets in distribution networks, such as voltage stability control in photovoltaic grid connected scenarios.

Synchronous grid connection: Synchronous inspection of substation busbar section switches to ensure grid parallel safety.

Typical Applications of Configuration B

Transformer voltage regulation: Control the tap changer through OLATC to maintain stable secondary voltage, suitable for industrial distribution transformers.

Thermal overload protection: based on RTD measurement of transformer winding temperature to prevent insulation aging.

Hardware and Interface

input configuration

Analog quantity: Configuration A supports 5 voltage inputs (U1-U3, Uo, U12B); Configuration B supports 4 currents (IL1-IL3, Io) and 3 voltages (U1-U3).

Digital quantity: Configuration A includes 12 binary inputs (BI) and 10 outputs (BO); Configuration B supports up to 14 BI and 13 BO channels.

communication interface

Supports IEC 61850-8-1 GOOSE, -9-2 LE SMV, compatible with Modbus, DNP3, IEC 60870-5-104, and supports IEEE 1588 time synchronization.

Installation and Configuration

Requirements for measuring transformers

Current Transformer (CT): The recommended CT accuracy level for non directional overcurrent protection is 5P/10P, and the actual accuracy limit coefficient F a is ≥ 20.

Voltage Transformer (VT): Residual voltage protection requires an open delta connection VT, and synchronous inspection requires a reference voltage input (U12B).

Parameter settings

Configure function blocks (such as PHxPTOV, FRPFRQ) through PCM600 tool, supporting custom logic and signal matrix mapping.

Safety and Compliance

Compliant with the EMC Directive (2004/108/EC) and the Low Voltage Directive (2006/95/EC), certified according to standards such as EN 50263 and EN 60255.

Maintenance and Service

Lifecycle support: Provide spare parts replacement, firmware upgrade, and modification services (such as replacing SPACOM relays), and manage configurations through the ABB Relays Online platform.

Synchronization check function

Function purpose: Used to achieve interconnection operation between two independent power system network parts. When conducting network interconnection, it is necessary to ensure that the voltage, frequency, phase and other parameters of the systems on both sides meet certain conditions to avoid excessive surge current and adverse effects at the moment of closing. The synchronous inspection function is precisely designed to ensure the safety of this process.

Working mode: The standard configuration defaults to working in continuous mode. In this mode, the device continuously monitors the synchronization status of the systems on both sides.

Signal connection and indication: The device monitors and analyzes the voltage and other parameters of the two systems in real time. When it is determined that the system meets the synchronization conditions, it will output a signal allowing the circuit breaker to close. This signal is connected to X100: PO2 and can be connected in series in the circuit breaker closing circuit as one of the necessary conditions for closing. At the same time, the synchronized information of the system will be connected to LED 8 to visually inform the operator of the synchronization status of the system.

Function lockout: To ensure the reliability and safety of the synchronization check function, the function will be locked when some abnormal situations occur. For example, when the primary voltage transformer fuse is detected to be blown (corresponding to X130: BI1), or a miniature circuit breaker fault is detected from the secondary voltage measurement circuit on the line or bus side (corresponding to X130: BI2 or X130: BI3), the synchronization check function (SECRSYN) will be immediately locked, prohibiting the circuit breaker closing operation, thereby avoiding network interconnection in abnormal situations and ensuring the safe and stable operation of the power system.