This electromechanical protection device features split-phase line differential protection with reliable single-phase, two-phase or three-phase tripping and automatic reclosing, with synchronisation and synchronism check. This protection has excellent sensitivity to high-resistance faults and provides safe phase selection for up to 5 line terminals.

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　　Other names of RED521:

　　Transmission line differential protection device RED521

　　RED521 Line differential protection relay

　　Voltage protection device RED521

　　RED521 is an electromechanical protection device produced by ABB (now Hitachi Energy), mainly used for protection, monitoring and control of overhead lines and cables. It is suitable for the needs of various complex application scenarios and provides a strong guarantee for the stable operation of the power system.

　　Main functions

　　Line differential protection: RED521 has a phase-separated line differential protection function, which can reliably realize single-phase, two-phase or three-phase tripping and automatic reclosing, and has synchronization and synchronization check functions. This protection has excellent sensitivity to high-resistance faults and provides safe phase selection for up to 5 line terminals.

　　Backup distance protection: When the communication channel is interrupted, the distance protection function of RED521 can be used as selective backup protection to ensure the safe operation of the line.

　　Current protection: RED521 is equipped with current protection function, which can effectively detect fault current in the line and take timely measures to prevent equipment damage.

　　Voltage protection: RED521 also has voltage protection function, which can monitor voltage changes on the line to ensure that the voltage fluctuates within the set range and protect the equipment from voltage anomalies.

　　Power system monitoring: RED521 can monitor the power system, including secondary system monitoring and frequency protection functions, to ensure the stable operation of the power system.

　　Integrated protection, control and monitoring: RED521 integrates multiple functions, including line differential protection, backup distance protection, current protection, voltage protection, etc., which can fully meet the protection needs of the power system.

　　High reliability: RED521 adopts advanced technology and design to ensure its high reliability and stability. Its split-phase line differential protection can reliably achieve single-phase/two-phase/three-phase tripping and automatic reclosing, and has synchronization and synchronism check functions.

　　Application features

　　Multi-purpose protection: RED521 has multi-purpose protection functions and can be customized according to the specific requirements of users to meet the needs of various complex application scenarios.

　　Easy to configure and debug: RED521 is pre-configured, type-tested, and set with default parameters at the time of delivery for fast and efficient debugging. At the same time, it provides a wide range of functions and scalable hardware to meet the specific requirements of users.

　　Wide application flexibility: RED521 is suitable for single circuit breaker or multi-circuit breaker arrangements, with single-phase or three-phase tripping functions. It can be easily adjusted to meet the specific requirements of the power system, making it an excellent choice for new and retrofit installations.

　　Protection functions

　　Line differential protection: RED521 has phase-isolated current differential protection with excellent sensitivity to high-resistance faults. It can provide safe phase selection for up to 5 line terminals and is suitable for single circuit breaker or multi-circuit breaker arrangements.

　　Backup distance protection: When the communication channel is interrupted, the distance protection of RED521 can be used as selective backup protection to ensure the stable operation of the power system.

　　Current protection: RED521 is equipped with current protection function, which can effectively detect the fault current in the line and take timely measures for protection.

　　Voltage protection: RED521 can monitor the voltage changes on the line and can provide timely protection when the voltage is abnormal.

　　Other functions

　　Power system monitoring: RED521 can monitor the power system, including secondary system monitoring and frequency protection functions, to ensure the normal operation of the power system.

　　Multi-purpose protection function: RED521 also has multi-purpose protection functions, which can be customized according to the specific requirements of users, such as full-process control, local and remote, directional ground fault, out-of-step protection, frequency conversion protection and other functions.

　　Technical specifications

　　The technical specifications of RED521 include but are not limited to the following aspects:

　　Hardware platform: RED521 adopts advanced hardware platform with high-performance processor and large-capacity storage space to ensure the stable operation and data processing capabilities of the device.

　　Communication interface: RED521 is equipped with a variety of communication interfaces, including Ethernet, serial communication, etc., which facilitates data exchange and remote monitoring with other devices.

　　Software configuration: RED521 provides a variety of software configuration options, and users can choose the appropriate software version and function module according to actual needs.

　　Phase-isolated current differential protection: RED521 has phase-isolated current differential protection function, providing safe phase selection for up to 5 line terminals. This protection method is of great significance to improving the reliability and safety of the line.

　　Support IEC 61850 standard: RED521 complies with the core value of IEC 61850 standard, ensuring the interoperability and future-proof capability of the solution. This enables RED521 to seamlessly integrate and communicate with other devices that comply with IEC 61850 standard.

　　New version of IED connection package: The new version of IED connection package for Relion 670 series realizes the interaction between Relion 670 series version 2.2 IED and protection and control IED manager PCM600 version 2.10 or higher. This provides users with more flexible and efficient configuration and management tools.

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　　Specific quotation is subject to customer service, because the product is new, the price is not real,

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