Introduction to the New SEL-851 Feedline Protection Relay Product in the United States

SEL-851 feeder protection relay

Protect the feeder with overcurrent components

SEL-851 provides various phase, negative sequence, residual, and neutral overcurrent components.

Prevent equipment damage through voltage protection

The voltage input options provide voltage, frequency, directional power, potential loss, and power factor elements.

Improve safety through arc flash detection

The SEL-851 combines light sensing technology and high-speed overcurrent protection to quickly detect arc flash events within 1 millisecond, reducing equipment damage and improving personnel safety.

Simplify integration

Serial, USB-C, and Ethernet ports, as well as DNP3, Modbus, and IEC 61850 protocols, provide communication options for improving system integration.

Simplify inventory

The universal power supply of the relay (24-250 Vdc, 110-240 Vac), selectable universal current input (1 A/5 A), and software selectable contact input (24-250 Vac/VDC) allow for reduced inventory and maintenance costs.

Reduce debugging time

The easy-to-use SEL Grid Configurator software features a spreadsheet style editor, * protection visualization, comprehensive reports, custom filters, and multi device settings management.

Improve message transmission speed

The deterministic timing and ease of programming, as well as the flexibility of fixed GOOSE message passing and multi device communication, ensure that outgoing messages are processed every 4 milliseconds.

Gain greater system visibility

High resolution current and voltage (sampled at 10 kHz) help to quickly identify issues such as harmonics generated by switches or damaged cables, in order to avoid serious interruptions.

Protecting feeders and equipment - The SEL-851 includes four current inputs and three optional voltage inputs for comprehensive current, voltage, and frequency protection. Protect medium and low voltage three-phase feeders through current imbalance, over/under frequency, circuit breaker/contactor faults, phase, negative sequence, and neutral instantaneous/time overcurrent components, as well as automatic reclosing function. The voltage input options provide voltage, directional power, potential loss, and power factor elements.

Improving safety through arc flash mitigation - enhancing safety and preventing equipment damage through the four optional arc flash detection (AFD) inputs of the relay. The SEL-851 combines light sensing technology and high-speed overcurrent protection to detect arc flash events within 1 millisecond.

Improve system visibility - The SEL-851 provides a 10 kHz current and voltage sampling rate to enable you to better understand the system. Identify issues, such as harmonics generated by switching or damaging cables, to prevent serious interruptions.

Improve system reliability - By coordinating the SEL-851 and its reclosing control function with downstream reclosers to achieve a complete recovery plan, improve your system reliability.

Reduce debugging time - Use SEL Grid Configurator software to configure SEL-851 settings, which is a new tool that can improve efficiency and insight into settings. It has a spreadsheet style editor, * protection visualization, comprehensive reports, custom filters, and multi device settings management.

Simplified Integration - The Ethernet, serial, and USB-C ports of the SEL-851 relay and its various communication protocols, including Mirrored Bits communication and IEC 61850 2nd edition, can be easily integrated into your existing system. Choose multiple sessions of Modbus TCP, Modbus serial, DNP3 LAN/WAN, or DNP3 serial to customize the configuration of your application.

Application of feeder protection

The overcurrent function of SEL-851 relay can protect power system circuits or equipment, including lines, feeders, transformers, and capacitor banks. Overfrequency and underfrequency, as well as overvoltage and undervoltage components, are highly suitable for applications in distributed power generation sites. The directional power components of the relay also make the SEL-851 suitable for utility or customer interface protection in the presence of customer generated electricity. In addition, you can use the SELogic control equations of relays * to provide custom protection and control applications.

Simplified design

The SEL-851 is built with high reliability hardware and equipped with a universal power supply, optional universal current input (1A/5A), and optional software optional binary input (24-250 Vac/VDC). Its simplified design helps reduce costs.

Fast and deterministic relay to

Relay communication uses fixed GOOSE messages to achieve fast and deterministic relay to relay communication. It is easy to program and provides flexibility for multi device communication of digital and analog signals at a fixed 4 ms rate.

Integrated network server

The built-in network server enables secure remote access to relays through password protection. You can remotely download status reports or view metering and relay information. You can also safely read, edit, save, and download relay settings. This helps to reduce the distance to the relay position to a certain extent, thereby saving time and money. The web server also supports firmware upgrades.

Operator control

Use the local/remote button controls on the front panel of the relay to enhance operator safety during debugging and testing. Use the trip and close button controls to perform circuit breaker control.

Measurement and monitoring

The built-in metering function of the SEL-851 relay eliminates the need for you to install a separate metering device. Analyze sequential event recorder (SER) reports and oscilloscope event reports for rapid debugging, testing, and post fault diagnosis.

Signal profile

Signal profile monitoring provides up to 16 selectable analog periodic snapshots (with selectable rates every 5, 10, 15, 30, or 60 minutes). Relays maintain signal configuration file information in non-volatile buffer memory, which can store up to 4000 entries with timestamps.

Relay management and diagnosis

The SEL Blueframe platform is designed on the Data Management and Automation (DMA) application suite to automatically collect, store, and manage device specific information, and support simplified daily management of compliance systems. The DMA diagnostic application provides SEL-851 status updates and detailed logs to help you monitor the health of relays and quickly identify communication issues.

The SEL-5601-2 synchroWAVe event software can help you diagnose the behavior of protective relays during power system faults. It is a functional and easy-to-use solution for displaying and analyzing SEL relay event reports and COMTRADE files.

Durable and sturdy hardware

Believe in the industry's widest operating temperature range, from -40 ° C to+85 ° C (-40 ° C to+185 ° F). The plastic chassis SEL-851 can withstand vibrations, surges, rapid transients, and temperatures, meeting strict industry standards. The conformal coating option for printed circuit boards provides additional barriers to pollutants in the air, such as hydrogen sulfide, chlorine, salts, and moisture.

The company mainly produces European and American brands. We have companies in Germany and the United States, and can purchase brands from any European country. For example, Germany's advantageous brands include: Germany's Baode BURKERT, Germany's DEMAG, Germany's HAWE Hawei, Germany's REXROTH Rexroth, Germany's HYDAC Hedec, Germany's PILZ relay, Germany's FESTO Festo, Germany's IFM Yifu door sensor, Germany's E+H Endershausen, Germany's Heidenhain HEIDENHAIN, Germany's P+F Beckhoff sensor, Germany's SICK, Germany's TURCK Turck, Germany's HIRSCHMANN industrial switch. Germany's Henschel, Germany's MURR, Germany's SCHMERSAL, Germany's SAMSON, Germany's EPRO under Emerson

MOOG, ASCO solenoid valve, MAC solenoid valve, NUMATIC, PARKER pneumatic hydraulic, VICKERS, ROSS

Norgren, UK

Italy OMAL, Italy ATOS, Italy CAMOZZI, Italy UNIVER, Italy CAMOZZI