ALSTOM V4555724-0100 Voltage Protection Relay

Overview

The V4555724-0100 monitors single-phase or three-phase voltages and compares them against programmable thresholds. It can be configured for definite time or inverse time characteristics, making it suitable for a wide range of applications. The relay features a robust design, user-friendly interface, and multiple communication options for integration into modern substation automation systems.

Key Features

• Voltage Protection Functions: Overvoltage (59), Undervoltage (27), residual overvoltage (59N), and voltage unbalance (47).

• Programmable Characteristics: Definite time or inverse time curves (IEC/ANSI).

• Measurement Accuracy: High accuracy over wide temperature range.

• User Interface: Local LCD display and keypad for settings and monitoring.

• Communication: RS485 with Modbus RTU protocol; optional Ethernet module.

• Digital I/O: Multiple digital inputs and output relays for alarm and trip signals.

• Event Recorder: Time-stamped event log for post-fault analysis.

• Self-Diagnostics: Continuous monitoring of internal health with watchdog output.

Technical Specifications

• Nominal Voltage: 100-240 VAC / 110-250 VDC (auxiliary supply).

• Voltage Measuring Inputs: 0-120 VAC (phase-to-neutral), 0-240 VAC (phase-to-phase).

• Frequency Range: 50/60 Hz (auto-sensing).

• Overvoltage Setpoint Range: 50-150% Un.

• Undervoltage Setpoint Range: 20-100% Un.

• Time Delay Range: 0.05-300 s (definite time) or inverse curves.

• Output Contacts: 4 form-C (rated 8A / 250 VAC).

• Digital Inputs: 4 (wet/dry selectable).

• Operating Temperature: -25°C to +70°C.

• Enclosure: 19" rack mount or panel mount options.

• Certifications: IEC 60255, CE, UL (pending).

Applications

The V4555724-0100 is widely used in utility substations, industrial power distribution, and critical infrastructure. Typical applications include:

• Generator voltage protection.

• Transformer overexcitation protection.

• Feeder undervoltage load shedding.

• Motor voltage supervision.

• Automatic transfer schemes (ATS) voltage sensing.

Configuration and Integration

The relay can be configured locally via the front panel or remotely using ALSTOM’s configuration software. It supports Modbus RTU over RS485, allowing easy integration with SCADA systems, PLCs, and substation automation controllers. The event recorder and fault records provide valuable data for post-event analysis. Multiple V4555724-0100 relays can be daisy-chained for multi-feeder applications.

In summary, the ALSTOM V4555724-0100 voltage protection relay delivers reliable and accurate voltage monitoring and protection, contributing to the safety and reliability of electrical networks.