Reduce Arc-Flash Hazards
SEL arc-flash detection technology significantly decreases the time it takes a relay to trip in response to an arc fault, which reduces hazardous arc‑flash incident energy. SEL combines light-sensing technology with fast overcurrent protection to provide high-speed arc-flash detection (AFD). Combining these technologies allows high‑speed tripping during arc‑flash events without overtripping for external faults.
SEL's cost‑effective arc‑flash detection technology reduces arc‑flash‑related equipment damage for standard and arc‑resistant switchgear in medium- and low-voltage applications. Arc‑flash detection comes standard in the SEL‑849 Motor Management Relay and is available as an option for the SEL-710-5 Motor Protection Relay, as well as the SEL‑751 and SEL‑751A Feeder Protection Relays.
See the Difference With and Without Arc‑Flash Detection
To validate the arc-flash detection performance, a series of tests were performed at a high‑current laboratory. This video shows the difference in arc‑flash intensity for the same test condition with and without SEL arc‑flash detection. In these tests, arc‑flash incident energy levels were reduced by 88 percent from 14.8 cal/cm2 using inverse‑time overcurrent protection to 1.7 cal/cm2 using AFD. This reduction from NFPA 70E Category 3 to Category 1 represents a significant improvement in safety.
Arc-Flash Protection Advantages
- High-Speed Detection
- Reduced Damage to Switchgear
Reduced Damage to Switchgear
With arc-flash hazard protection, equipment damage is minimized during an arc‑flash event, returning affected equipment to service faster and maximizing power system availability.
The picture on the left (1) shows an undamaged insulator before the arc-flash test. The picture in the center (2) shows the catastrophic insulator damage resulting from the 46-cycle arc flash, as shown in the "Without Protection" video. Due to the extensive damage, this circuit breaker will have to be completely replaced.
The picture on the right (3) shows the relatively minor damage to the switchgear "With Protection." This circuit breaker can be repaired.
- Coordinated Protection
- Flexible Installation
- Viewable Arc-Flash Test Videos
- Substation Ethernet
The SEL‑751A withstands electrostatic air discharge of 15 kV and communicates via Modbus® TCP, DNP3 LAN/WAN, Telnet, FTP, and IEC 61850.
- Quality, Reliability, and Service
- APP 751A: Feeder Protection Relays
This course provides complete application training for the SEL‑751A Feeder Protection Relay, an extremely versatile protective relay used worldwide for industrial and utility feeder protection.
- APP 849: SEL‑849 Motor Management Relay
Will your motors perform safely and reliably in today’s 24‑7 process-integrated world? Increase your motor protection knowledge as you set and apply SEL-849 Motor Management Relays in a simulated low-voltage motor control center. In our hands‑on lab environment, you will configure basic overload settings and test relay responses, including arc-flash detection. Learn to use the relay’s simple web server interface and Ethernet communications for real-world control operations. Predict potential problems by analyzing load reports, starting trends, and motor operating statistics to ensure safe, continuous motor function. Sign up now to learn how the SEL-849 can help protect your plant, your processes, and your personnel.
- SYS 403: Practical IEC 61850 Application
The international standard IEC 61850 was designed to standardize communications and integration methods and to support systems built from multivendor intelligent electronic devices (IEDs) that are networked to perform protection, monitoring, automation, metering, and control functions. SYS 403 is designed to be interactive and activity based. During this course, you will configure and implement a realistic IEC 61850 communications and automation scheme. Each unit of this course will guide you, step-by-step, through configuring this comprehensive communications and automation scheme.
Arc-Flash Protection Products
Protect asynchronous (induction) and synchronous motors with one SEL-710-5 Motor Protection Relay. New features include broken rotor bar detection and variable-frequency drive (VFD) support as well as options for arc-flash detection, differential protection, and synchronous motor protection.
Learn more about the SEL-710-5
The SEL‑751 Feeder Protection Relay is ideal for directional overcurrent, fault location, arc-flash detection, and high-impedance fault detection applications. Flexible I/O options, easy mounting, and fast settings make the SEL‑751 the right solution for industrial and utility feeder protection.
Learn more about the SEL‑751
The SEL-751A Feeder Protection Relay is the right solution for industrial and utility feeder protection, with flexible I/O options, easy mounting, and fast settings.
Learn more about the SEL‑751A
The SEL-849 Relay offers current-, voltage-, and thermal-based motor protection; arc-flash detection; and power metering. It also provides all basic motor protection features, including short-circuit, load loss, load jam, and frequent-starting protection as well as imbalance-current and phase-reversal protection.
Learn more about the SEL‑849
The SEL-4520 Arc-Flash Test Module provides a convenient way to test the operation of arc-flash detection relays installed in metal‑clad and metal‑enclosed switchgear. The SEL‑4520 is used to test the SEL‑751 and SEL‑751A Feeder Protection Relays and other arc-flash detection relays that use light and overcurrent to sense an arc-flash event.
Learn more about the SEL‑4520