REX521BBHGLB01C Feeder Protection Relay

ABB REX521BBHGLB01C is a feeder protection relay, mainly used for the protection, control, measurement and monitoring of feeders in the power system to ensure the stability and safety of the power system. Main Features Comprehensive Protection Functions: It has functions such as overcurrent protection (including short-circuit protection and overload protection), undervoltage protection, overvoltage protection, and negative sequence current protection. These functions can effectively deal with various faults during the operation of the feeder. Real-time Monitoring and Control: It can collect parameters such as the current, voltage and power of the feeder in real time. At the same time, it provides functions for starting and stopping control and remote operation of the feeder, which is convenient for operation and maintenance personnel to grasp the operation status of the feeder in real time and carry out remote control. Communication Interfaces: It supports standard communication protocols such as IEC 61850, Modbus, and DNP3, and has a network interface, making it easy to integrate with other systems to achieve centralized monitoring and remote management. Alarm and Fault Recording: It has an audible and visual alarm function, which can promptly notify operators of problems in the system. In addition, it can record protection events, fault logs and operation history, providing a basis for fault analysis and improvement. User Interface: It is equipped with a graphical display interface and supports touch screen operation. The interface is user-friendly, simplifying the system setting and monitoring process, and facilitating users to configure equipment and view data. Reliability and Durability: It is designed to adapt to various industrial environments, has good anti-interference ability and durability. After strict testing, it can ensure long-term stable operation and reduce maintenance requirements.

Technical Specifications Input Voltage: It supports a variety of input voltage ranges, which specifically depend on the model and configuration. Protection Functions: Including overcurrent protection, undervoltage protection, overvoltage protection, negative sequence current protection, etc. Communication Protocols: Supporting protocols such as IEC 61850, Modbus, and DNP3. Data Acquisition: It has a high-precision data acquisition function and supports the input of various sensors. Operation Interface: Graphical display interface, supporting touch screen operation. Working Environment: It is adapted to the industrial environment and can work stably within a wide temperature range, usually from -40°C to 70°C, with good anti-interference ability and durability.

General Installation Steps of ABB REX521BBHGLB01C Feeder Protection Relay: Preparation Work: Confirm that the installers possess relevant electrical knowledge and skills and are familiar with the equipment installation requirements and safety codes. Prepare the tools required for installation, such as screwdrivers, wrenches, multimeters, etc. Check whether the equipment and its accessories are complete, in good condition, and free from damage or shortage. At the same time, confirm that the model and specifications of the equipment are in line with the actual application requirements. Determine the installation location. It should be in a dry, well-ventilated environment without strong electromagnetic interference and be convenient for operation and maintenance. Ensure that there is enough space at the installation location to accommodate the equipment and that it meets the heat dissipation requirements of the equipment. Installation of the Enclosure: If the equipment has an independent enclosure, first fix the enclosure at the selected installation location. Drill holes on the installation surface according to the positions of the mounting holes of the enclosure, and use suitable screws and washers to firmly fix the enclosure. Installation of the Relay Body: Carefully place the ABB REX521BBHGLB01C relay into the already fixed enclosure and align it with the mounting holes. Use a screwdriver or other suitable tools to fix the relay inside the enclosure through the mounting holes on the enclosure. Ensure that the relay is installed firmly and will not shake or loosen during operation.

Electrical Connection: Power Supply Connection: According to the rated voltage requirements of the equipment, connect the appropriate AC or DC power supply to the power terminals of the relay. When connecting, pay attention to the correct polarity and phase sequence of the power supply, use wires of suitable specifications, and ensure a firm connection to avoid loosening or short circuits. After the connection is completed, you can use a multimeter to measure the power supply voltage to confirm that the voltage is normal. Connection of Current and Voltage Transformers: Connect the secondary outputs of the current transformer (CT) and the voltage transformer (VT) to the corresponding input terminals of the relay. Ensure that the wiring methods of the CT and VT meet the requirements of the relay and that the wiring is firm. Note that the secondary side of the current transformer cannot be open-circuited, and the secondary side of the voltage transformer cannot be short-circuited. Control and Signal Connection: According to the actual application requirements, connect the control input terminals of the relay (such as digital input, remote control command input, etc.) and the signal output terminals (such as alarm output, trip output, etc.). These connections are usually made using control cables. Ensure that the specifications of the cables are appropriate and the connections are firm and reliable. For cables that require shielding, ensure that the shielding layer is correctly grounded to reduce electromagnetic interference. Communication Connection: If it is necessary to communicate the relay with other devices or systems (such as through protocols like IEC 61850, Modbus, etc.), connect the corresponding communication cable to the communication interface of the relay. Set the communication parameters (such as baud rate, data bits, stop bits, parity bits, etc.) according to the requirements of the communication protocol. Inspection and Testing: After all electrical connections are completed, carefully check whether the wiring is correct and firm, and whether there are any situations of loosening or short circuits. Ensure that the screws of all terminals are tightened and that the insulation layer of the cables is not damaged. Use tools such as a multimeter to measure the power supply voltage, the input signals of the current and voltage transformers, etc., and confirm that the input signals are normal. Power on the relay and observe the status of the indicator lights of the relay. Under normal circumstances, the power indicator light should be on, and other indicator lights should display the corresponding status according to the initial state of the equipment. Carry out some simple tests, such as simulating the input of fault signals, to check whether the protection function of the relay operates normally and whether the control and signal outputs are correct. For the communication function, test whether the communication with other devices or systems is normal and whether data can be transmitted correctly. If any problems are found during the testing process, disconnect the power immediately, check the wiring and settings, eliminate the faults, and then retest until the equipment operates normally.

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