ABB REX521BBHGLB01C

Description

Detailed parameter table

ABB REX521BBHGLB01C

Product introduction

The REX521BBHGLB01C is a highly versatile feeder protection relay from ABB, meticulously engineered to ensure reliable protection, control, measurement, and supervision within medium – voltage networks. This model is also well – equipped to safeguard large or medium – sized three – phase AC motors in circuit – breaker – controlled motor drive systems. As part of ABB’s comprehensive range of protection solutions, the REX521BBHGLB01C serves as a crucial component in maintaining the integrity and efficiency of electrical distribution systems.

It offers a comprehensive suite of protection functions, making it suitable for a wide array of applications. Whether it’s protecting incoming and outgoing feeders, motor feeders, or providing backup protection for power transformers and high – voltage line – protection relays, the REX521BBHGLB01C has been designed to meet the demands of modern power distribution setups. With its ability to interface with both conventional current and voltage transformers, as well as having a version compatible with current and voltage sensors, it provides flexibility in system integration.

Core advantages and technical highlights

Comprehensive protection functions: The REX521BBHGLB01C comes with a rich set of protection features. Its 3 – phase non – directional overcurrent protection, with 3 stages, can effectively detect and respond to abnormal current levels in the power system. The non – directional earth – fault protection, also in 3 stages, is vital for ensuring the safety of personnel and equipment by quickly identifying earth faults. The phase discontinuity protection guards against situations where one or more phases are interrupted, preventing damage to connected equipment. The 3 – phase thermal protection monitors the temperature – related stress on the system, providing early warnings of potential overheating issues. Additionally, its ability to detect transformer inrush and motor start – up currents helps in smooth operation during these transient events. In comparison to more basic relays, these multiple layers of protection ensure a higher level of system security.

Efficient communication capabilities: By supporting communication protocols like SPA, IEC, Modbus, and Lon, the REX521BBHGLB01C enables seamless integration with various control and monitoring systems. This allows for real – time data transfer, remote control, and system – wide coordination. For example, in a large industrial complex, the relay can communicate with the central control room via Modbus, providing up – to – date information on feeder status, fault events, and power quality parameters. This connectivity is a significant advantage over relays with limited communication options, enabling better – informed decision – making and more efficient system management.

User – friendly interface: The 6 x 16 character display on the REX521BBHGLB01C simplifies local operation and monitoring. Technicians can easily view important information such as current values, voltage levels, and fault indications directly on the relay’s display. This intuitive interface reduces the learning curve for operators and allows for quick identification of issues, leading to faster troubleshooting and reduced downtime.

Self – supervision and high reliability: Equipped with autodiagnostic circuits, the REX521BBHGLB01C constantly monitors its own performance. This self – supervision feature ensures high reliability by detecting any internal malfunctions or impending failures. In the event of an issue, it can take appropriate actions to avoid false operations, maintaining the integrity of the power system. This is a crucial aspect in applications where continuous and accurate operation is essential, such as in utility substations.

Typical application scenarios

In a medium – voltage distribution substation, the REX521BBHGLB01C can be used to protect incoming and outgoing feeders. For incoming feeders, it monitors the power supply from the grid, ensuring that any overcurrent or earth – fault conditions are detected and addressed promptly. If a sudden increase in current occurs due to a fault in the upstream grid, the relay’s overcurrent protection will quickly trip the circuit breaker, preventing damage to the substation equipment. For outgoing feeders supplying power to industrial or commercial customers, the relay provides protection against faults within the customer’s premises. In case of a short – circuit in a factory’s electrical system, the REX521BBHGLB01C will detect the fault and isolate the affected feeder, minimizing the impact on other customers.

In an industrial plant with numerous three – phase AC motors, the REX521BBHGLB01C can be deployed to protect motor feeders. During motor start – up, the relay’s ability to detect inrush currents ensures that the motor is not mis – tripped due to the high starting currents. Once the motor is running, the 3 – phase thermal protection monitors the motor’s temperature. If the motor starts to overheat due to mechanical issues or excessive load, the relay will take appropriate action, such as sending an alarm or tripping the motor to prevent damage.

ABB REX521BBHGLB01C

Related model recommendations

ABB RED521 1MRK002003 – BA: A more advanced numerical line protection relay. While the REX521BBHGLB01C focuses on feeder and motor protection in medium – voltage networks, the RED521 is designed for high – voltage transmission and distribution lines, offering features like distance protection which is more suitable for long – distance line protection. However, in some complex power systems, they can complement each other, with the REX521BBHGLB01C handling the lower – level feeder protection and the RED521 protecting the main transmission lines.

ABB REL551 1MRK002480 – AE: A cost – effective overcurrent relay. It can be used in secondary protection roles in systems where the REX521BBHGLB01C is the primary feeder protection. The REL551 is simpler and more basic in its functionality compared to the REX521BBHGLB01C, but it can still provide an additional layer of protection in case of certain types of faults.

ABB PCS6000: A substation automation system that can integrate data from the REX521BBHGLB01C. This system allows for centralized monitoring and control of multiple relays and other substation equipment, enhancing the overall management of the power distribution system.

ABB CT600/VT600: High – accuracy current and voltage transformers are optimized for use with the REX521BBHGLB01C. These transformers ensure accurate measurement of current and voltage values, which is crucial for the relay’s protection and monitoring functions.

Installation, commissioning and maintenance instructions

Installation preparation: Mount the REX521BBHGLB01C in a suitable panel location, ensuring proper ventilation and accessibility. Connect the current and voltage transformers to the relay’s designated input terminals, carefully verifying the wiring connections and ensuring correct polarity. For power supply, connect the appropriate power module (PS_87H or PS_87L depending on the system requirements) using the recommended cable size. When connecting communication cables for protocols like Modbus or Lon, use shielded cables to minimize interference. Before powering on the system, double – check all connections and ensure that all safety procedures are followed.

Commissioning: After installation, perform a series of tests to verify the proper functioning of the REX521BBHGLB01C. Check the display to ensure that it is showing correct values for current, voltage, and other parameters. Test the protection functions by simulating various fault conditions, such as overcurrent and earth – fault scenarios, and verify that the relay responds correctly by tripping the associated circuit breakers. Configure the communication settings according to the requirements of the overall control system, and test the data transfer between the relay and other devices. Calibrate the relay if necessary to ensure accurate measurement of electrical parameters.

Maintenance suggestions: Regularly inspect the REX521BBHGLB01C for any signs of physical damage, loose connections, or abnormal operation. Clean the relay’s enclosure and display to prevent dust accumulation, which could affect its performance. Check the communication status periodically to ensure that data is being transmitted correctly. Annually, verify the protection settings to ensure they are still appropriate for the current power system conditions. Test the relay’s trip functionality using a suitable test equipment to ensure that it will operate as expected in case of a real – world fault. If any issues are detected, refer to the manufacturer’s documentation for troubleshooting and repair procedures.

Service and guarantee commitment

ABB provides a reliable service and guarantee for the REX521BBHGLB01C. The product typically comes with a standard warranty period, which covers manufacturing defects and ensures that the relay meets the specified performance standards. ABB’s technical support team is available to assist customers with any questions or issues related to installation, commissioning, or maintenance. They can provide remote support for troubleshooting, as well as on – site service if required. In addition, ABB offers regular firmware updates to enhance the relay’s functionality and address any potential security vulnerabilities. Extended service contracts can be availed for more comprehensive maintenance and support, including preventive maintenance services, which can help in maximizing the lifespan and performance of the REX521BBHGLB01C.