When discussing power grid safety, relay protection devices are an indispensable core component—they continuously monitor equipment operating conditions and, upon detecting a fault, respond instantaneously, eliminating risks at the earliest possible stage. Today, we will introduce the ABB REX640 product: a "versatile protection expert" capable of adapting to a wide range of applications, which reliably fulfills its protective role at every stage of medium-and low-voltage power grids.
I. All-in-one coverage: one device meets your protection needs across multiple scenarios
The REX640 is a truly versatile relay protection device whose applications encompass virtually every aspect of the power system. Whether applied to generators in power plants, transformers in substations, or equipment such as distribution lines, motors, and capacitor banks, it provides precise and reliable protection.
For transformer protection, the REX640 is equipped with comprehensive differential protection, overcurrent protection, overtemperature protection, and other functions. It continuously monitors the transformer's "condition"; once an abnormal condition—such as a winding short circuit, overload, or excessive oil temperature—is detected, it can respond instantaneously, interrupt the fault circuit, and prevent the transformer from suffering more severe damage.
In terms of motor protection, the REX640 delivers particularly outstanding performance. It offers multiple protection functions, including locked-rotor protection, phase-loss protection, and overtemperature protection, enabling it to effectively respond to various faults that may occur during motor startup and operation. For example, when a motor experiences a locked-rotor condition, the device can detect it rapidly and act promptly, preventing the motor from being damaged by overheating and significantly extending its service life.
In addition, REX640 provides specialized protection for equipment such as feeders/lines, busbars, and parallel capacitor banks. It is like a versatile solution: regardless of the type of power equipment it encounters, it can deliver the most suitable protection scheme.
II. Modular design enables flexible customization to meet diverse requirements
The REX640 features a fully modular hardware and software design, providing unparalleled flexibility and scalability. Users can freely select and combine various functional modules according to their actual needs, thereby customizing the protection solution that best suits their requirements.
In terms of hardware, the REX640 modules can be easily plugged in and removed and replaced; users can therefore add or remove measurement channels, control loops, and other components at any time according to their needs.
In terms of software, it offers a comprehensive suite of applications, allowing users to select the appropriate application package based on their specific use cases and thereby achieve different protection functions. Moreover, these application packages can be flexibly combined to meet users' unique protection needs.
This modular design not only facilitates user customization but also enables the REX640 to readily adapt to the evolving requirements of power grids. Whether during grid upgrades and retrofits or when new equipment is integrated, the REX640 can quickly adapt to new operating conditions through module replacement and software upgrades, providing users with continuous and reliable protection.
III. Intelligent human-machine interface for convenient and efficient operation
The REX640 features an intuitive and user-friendly human-machine interface (HMI), enabling users to operate and manage the equipment with ease. Its 7-inch color touchscreen incorporates a brand-new visual design that displays power distribution process information in an intuitive manner, providing users with a clear overview of the power grid's operating status.
Ready-made LHMI pages based on applications save users considerable time and effort. Without the need for complex configuration or programming, users can simply select the appropriate application to quickly access the corresponding operation interface. Moreover, these pages can be customized according to user needs, further enhancing operational convenience.
In addition, the REX640 offers users the choice between a web-based HMI (WHMI) and a cost-effective switchgear HMI (SHMI). SHMI can cover up to 20 REX640 relays and clearly displays the operating status of the switchgear; users need to select only one panel/aisle at a time to access all LHMI functions, thereby significantly improving operational efficiency.
IV. Digital Empowerment: Facilitating the Intelligent Development of the Power Grid
Driven by the digital transformation wave, the REX640 keeps pace with the times and features robust digital capabilities, providing comprehensive support for the digitalization needs of substations.
It supports the integration of signals from conventional instrument transformers and sensors, and receives multiple sets of sampled measurement values via an IEC 61850-9-2 LE sampling Ethernet interface, enabling efficient data acquisition and transmission. Additionally, the REX640 supports communication protocols such as IEC 61850-8-1 GOOSE, enabling seamless integration with other smart devices and the establishment of an intelligent power network.
By connecting to the power grid dispatching system and the O&M management platform, the REX640 enables real-time transmission of equipment operating data, as well as remote monitoring and remote control. O&M personnel can monitor equipment operating conditions from the monitoring center and perform operations such as parameter adjustment and fault diagnosis, thereby significantly improving O&M efficiency and reducing O&M costs.
V. Reliable Quality, Proven Through Rigorous Testing
As a global leader in the power industry, ABB consistently places product quality at the forefront. From R&D and design to manufacturing, every stage of the REX640's development adheres to stringent quality standards and undergoes rigorous testing.
It incorporates high-quality components and advanced manufacturing processes, providing excellent immunity to interference and strong environmental adaptability. Whether in outdoor environments characterized by high temperature, high humidity, or high altitude, or in industrial sites subject to strong electromagnetic interference, the REX640 operates stably without its protection performance being compromised by environmental factors.
In addition, the REX640 features a comprehensive self-diagnostic function that enables real-time monitoring of its operating status; once a fault is detected, it promptly issues an alarm signal, ensuring the reliability of its protection functions.
As a distributor for ABB, we not only provide users with high-quality products but also offer comprehensive professional services. From product selection and installation and commissioning to subsequent operation, maintenance, and servicing, our professional team provides full-cycle support, delivering the most attentive service to our users.
All of our technical staff have undergone rigorous training and possess extensive experience and specialized knowledge, enabling them to provide users with personalized solutions. Whether providing product operation training or troubleshooting and resolving faults, we respond promptly to ensure that users' equipment operates normally.
With its comprehensive protection capabilities, flexible modular design, user-friendly human-machine interface, robust digital functionality, and reliable quality, the ABB REX640 relay protection device has become a leader in the field of power system protection. If you are seeking a high-performance, high-reliability relay protection device, the REX640 is undoubtedly your ideal choice.
