REJ603BBB10NN3XC | ABB Self-Powered Numerical Relay

Overview

The ABB REJ603BBB10NN3XC is a self-powered numerical relay designed for use in distribution networks, focusing on protective functions against overcurrent and earth faults. It is essential to ensure that individual load or branch circuit protections comply with local electricity authority regulations before implementing settings and coordination for overcurrent and earth fault protection.

Features

• Type: Self-powered feeder protection relay
• Application: Selective short-circuit and earth-fault protection in secondary distribution networks, particularly for small transformers in utilities and industries
• Power Source: Powered by current transformers, suitable for remote locations without auxiliary power

Protection Functions

• Non-Directional Overcurrent Protection: Detects overcurrent conditions without regard to current direction
• Earth-Fault Protection: Monitors for earth faults, providing necessary trip functions
• Thermal Overload Protection: Protects against thermal damage due to prolonged overcurrent
• Inrush Current Detection: Identifies inrush currents during equipment start-up
• Remote Trip Capabilities: Allows remote disconnection of circuits for safety
• Measurement Functions: Provides insights into current and fault conditions

Operating Characteristics

• Start Current: The minimum current level at which the relay begins to operate, set as I>, I>>, Io>, or Io>>. The relay should start when the current exceeds 1.3 times the set start current.

• Definite Minimum Time Characteristic (DMT): After starting under fault conditions, the relay operates only after a set minimum time, regardless of fault current magnitude (time settings: t>, t>>, to>, to>>).

• Inverse Definite Minimum Time Characteristic (IDMT): Once started, the relay’s operating time varies inversely with the magnitude of the fault current. Higher fault currents result in shorter operating times. This characteristic can be adjusted using a time multiplier setting (k, ko).

Additional Features

• Low-Energy Trip Output: Allows for bi-stable outputs to trip circuit breakers efficiently
• Hand-Reset Electromechanical Flag: Provides a manual reset feature for the relay
• USB Port: Enables powering up the relay and accessing event/fault information when CT power is unavailable
• Extensive Self-Supervision: Monitors relay hardware and software to ensure reliability