Description

The ABB REJ603BB401NN31E is a compact and versatile single-phase voltage protection relay, part of ABB’s Relion® 603 series. This dedicated voltage relay is designed to provide reliable and fast protection against various voltage anomalies in utility and industrial power systems, ensuring the integrity and stability of the electrical network.

Application Scenarios

Consider a remote distribution substation supplying power to a critical industrial facility. Fluctuations or failures in the voltage supply can severely impact sensitive equipment and processes. The ABB REJ603BB401NN31E acts as a crucial monitoring and protection device in such scenarios. Installed on the single-phase AC voltage supply, it continuously monitors the voltage level. If the voltage deviates outside predefined limits, such as during an undervoltage or overvoltage condition, the REJ603BB401NN31E quickly detects the anomaly and initiates a tripping signal to the appropriate circuit breaker. This rapid response prevents damage to connected equipment and ensures the stability of the power supply to the industrial facility, minimizing potential downtime and economic losses.

Parameter

Main Parameters Value/Description Product Model REJ603BB401NN31E Manufacturer ABB Product Category Single-Phase Voltage Protection Relay Rated Voltage (Un) 100-130 V AC Configurable within this range to match the system voltage. Operating Voltage Range 0.8 to 1.15 x Un Wide operating range to accommodate voltage variations. Rated Frequency (fn) 50/60 Hz Selectable to suit different power system frequencies. Voltage Input 1 x Phase-to-Neutral Provides single-phase voltage measurement. Protection Functions Overvoltage (V>), Undervoltage (V<) Essential protection against voltage deviations. Trip Characteristics Definite time, Inverse time Flexible settings for various application requirements. Binary Inputs 2 Configurable for external blocking or other control functions. Binary Outputs 2 Programmable for tripping and alarm indications. Mounting Type Flush mounting Standardized for easy panel integration.

Technical Principles and Innovative Values

• Innovation Point 1: Precise Voltage Measurement. The REJ603BB401NN31E utilizes high-accuracy voltage measurement circuitry to ensure reliable detection of even small voltage deviations, minimizing the risk of false tripping while providing effective protection. This precision is crucial for sensitive loads.
• Innovation Point 2: Flexible Setting Groups. The relay offers multiple setting groups, allowing users to adapt the protection characteristics to different operating conditions or network configurations. For example, different voltage thresholds and time delays can be activated based on the time of day or the status of other equipment.
• Innovation Point 3: Integrated Event Recording. The REJ603BB401NN31E records events such as trips and setting changes with timestamps, facilitating post-fault analysis and system diagnostics. This historical data is invaluable for understanding system behavior and optimizing protection settings.
• Innovation Point 4: Compact and Robust Design. The REJ603BB401NN31E features a compact design, saving valuable panel space. Its robust construction ensures reliable operation in demanding industrial environments, contributing to a longer service life and reduced maintenance needs.

Application Cases and Industry Value

In a solar power plant, the ABB REJ603BB401NN31E is used to protect the grid connection point from overvoltage conditions that can occur due to fluctuations in solar generation or grid disturbances. When the grid voltage exceeds a safe threshold, the REJ603BB401NN31E quickly disconnects the solar plant from the grid, preventing damage to the inverters and ensuring the stability of the local distribution network. Plant operators have praised the fast response time and reliable operation of the REJ603BB401NN31E, which has helped them comply with grid connection requirements and protect their valuable equipment. The clear indication of voltage faults provided by the relay also simplifies troubleshooting and reduces downtime.