ABB REX521 REX521BBHGLB01C Feeder Protection Relay
Delivery time 3 days
Product origin New/used
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The ABB REX521 is a multifunctional feeder protection relay suitable for protect
The ABB REX521 is a multifunctional feeder protection relay suitable for protecting, controlling, measuring, and monitoring medium-voltage networks and motors. The following is an introduction:
Features
Diverse Protection Functions: It offers a variety of protection functions, including overcurrent protection (such as 3I>, 3I>>, and 3I>>>) and ground fault protection (Io>). It effectively addresses various feeder faults, such as overload, short circuit, and ground fault, ensuring stable power system operation.
Excellent Communication Capabilities: It supports multiple serial communication protocols, such as SPA, IEC, Modbus, and Lon, facilitating data exchange with other devices or systems and enabling remote monitoring, parameter setting, and fault diagnosis, improving system manageability and operational efficiency.
Measurement and Monitoring: It provides real-time measurement and monitoring of key electrical parameters, such as voltage, current, and power, providing data support for system analysis, troubleshooting, and operational optimization, helping operators and maintenance personnel to understand the operating status of the power system. Self-Monitoring Function: Equipped with an automatic diagnostic circuit, it monitors its operating status in real time, ensuring high reliability and preventing false operation. Upon detecting a fault, it promptly issues an alarm signal, alerting maintenance personnel to address the issue.
Convenient Display and Operation: A 6×16 character display facilitates local operation and monitoring, visually displaying various operating parameters and alarm information, making it easier for maintenance personnel to perform on-site equipment commissioning, maintenance, and troubleshooting.
Technical Parameters
Rated Voltage: Typically common medium voltage levels such as 10kV and 35kV, depending on the application scenario and configuration.
Rated Current: Different rated current specifications can be selected based on actual application requirements to accommodate feeder protection with varying load currents.
Power Consumption: Under normal operating conditions, power consumption is low, ensuring energy conservation and system efficiency.
Operation Time: The protection operates quickly, detecting faults and tripping quickly, minimizing the impact on equipment and systems. Typical overcurrent protection operation times range from tens of milliseconds to several seconds, depending on the protection settings and fault type. Application Areas
Substations: Used to protect incoming and outgoing feeders within a substation, ensuring reliable connections between the substation and the external grid and preventing faults from impacting the entire substation's operation.
Industrial Power Distribution Systems: Within industrial enterprises' power distribution systems, these devices can protect feeders to workshops and production lines, ensuring a stable power supply during industrial production and minimizing production interruptions caused by feeder failures.
Backup Protection: These devices can serve as backup protection for power transformers and high-voltage line protection relays, providing additional protection in the event that the primary protection device fails or fails to operate promptly, thereby enhancing the safety and reliability of the power system.
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