Hitachi Energy RED670 Line Differential Protection IED Unit

Module Feature

RED670 belongs to Hitachi Energy Relion 670 protection control series.

It adopts phase-segregated differential algorithm, supports high-resistance fault detection, suitable for two-terminal to five-terminal line application. It integrates distance, overcurrent, breaker failure and earth fault backup protection, supports IEC61850, GOOSE, DNP3 and IEC104. It has built-in disturbance recorder and fault locator, widely used in power grid substation and industrial power plant transmission line protection.

Working principle

The IED exchanges synchronized current phasor data with remote-end relay via communication channel.

When internal line fault is detected, differential element issues trip signal to open circuit breaker. It records COMTRADE fault waveform, fault time and fault type for post-fault analysis, and uploads running data to substation SCADA system.

Onboard components

Main processing board, analog CT/VT sampling module, Ethernet communication module, graphic HMI panel, binary input/output relay matrix, DC power supply circuit.

LED indicators

Front LEDs display power status, run state, trip indication and communication channel alarm.

Hardware self‑diagnosis

Continuous online monitoring detects CT circuit failure, communication channel degradation, hardware anomaly and power supply fault, alarm information is displayed on local panel and uploaded to station control system.

Programming software

PCM600 Engineering Tool, used for protection setting, logic configuration, disturbance record reading and firmware upgrade.

Electrical & Process Parameters

Model:RED670 Brand:Hitachi Energy (Former ABB) Device type:Line differential protection IED Aux supply:90–250V DC CT input:1A / 5A Function:Transmission line differential, distance and backup protection, fault recording and remote monitoring

Mechanical & Structure

Mounting:Panel cutout or 19-inch rack mounting

Protection class:IP20

Housing:Metal relay enclosure

Environmental

Operating temperature:-25℃ ~ +55℃

Storage temperature:-40℃ ~ +85℃

Ambient humidity:5~95% non‑condensing

Certification:CE, IEC, UL

Status:Original Hitachi Energy substation protection spare

Installation

Install the relay inside protection panel, connect CT, DC auxiliary power and communication link.

Complete channel delay calibration, protection setting and trip logic test before energizing. Verify synchronization status between local and remote relay.

Interface

CT/VT analog terminals, binary I/O terminals, Ethernet port, fiber communication interface.

Diagnostic

Differential unstable: Incorrect CT polarity, channel delay mismatch or communication interruption.

Breaker failure alarm: Breaker fails to open after trip command.

Disturbance record missing: Trigger logic not configured properly.

Product Brief

Hitachi Energy RED670 Relion 670 line differential IED, multi-terminal transmission line protection relay for substation automation replacement.