Whether it’s a full-plant system or a standalone device, an SEL solution can help you meet the highest standards for reliability and security—while also reducing lifetime cost of ownership.

With an SEL solution, you can:

  • Standardize on a single relay model to protect your entire fleet. SEL products support the full range of hydro generation sizes, configurations, and voltages.
  • Reduce errors and training costs. Use two identical SEL relays, or combine two different SEL relay models, and achieve high-quality primary and backup protection from a single vendor.

Use SEL products for:

  • Monitoring and control of generator-to-substation connections.
  • Generator and step-up transformer protection—either standalone or combined.
  • Integration into Ethernet-based plant control systems using IEC 61850 Edition 2, DNP3, EtherNet/IP, or Modbus TCP.
  • Annunciation, precise time, and equipment monitoring systems.

Generator Protection

Utility and Continuous Generation Solutions

Protect and control entire generation units—including step-up transformers—with a solution based on the SEL-400G Advanced Generator Protection System or the SEL-700G Generator Protection Relay.

SEL-400G Advanced Generator Protection System

Advanced protection for generators, generator buses, and generator step-up (GSU) transformers, all in one package. Automatically synchronize frequency, voltage, and phase control. Detect faults faster, limit generator damage, and return to service faster.

  • Pumped storage protection—no need for additional relays
  • Comprehensive stator fault protection
  • Injection-based rotor/field winding protection (SEL-400G plus SEL-2664S Stator Ground Protection Relay and SEL-2664 Field Ground Module)
  • Synchronization to the grid
  • Metering and reporting
Learn more 

SEL-700G Generator Protection Relay

Reliable, comprehensive protection for generators of any size. The SEL-700G is a complete protection and synchronization solution with flexible I/O, advanced communications capabilities, and a variety of mounting options. It is ideal for upgrades and retrofits.

  • Current differential protection
  • Breaker wear monitoring
  • Islanding detection
  • Synchronization to the grid

Metering and reporting functions

Learn more 

Standby and Prime Generation

SEL offers protective relays perfectly suited for standby and prime generators. They can provide complete standalone protection and are ready to integrate with plant control systems.

SEL-700G Generator Protection Relay

Reliable, comprehensive protection for generators of any configuration or fuel type. The SEL-700G is a complete protection and synchronization solution with flexible I/O, advanced communications capabilities, and a variety of mounting options.

Learn more 

Monitoring, Control, and Integration

Communicate the relay status, stator temperature, and bearing temperature to the plant control system with SEL products.

Communications and Cybersecurity

SEL communications solutions help ensure that communications networks are reliable, cybersecure, and compliant with NERC CIP auditing requirements.

Engineering Services

We can partner with you to create an SEL solution that puts you in control of your own system. From modeling and planning through commissioning and training, our engineers are among the electric power industry’s foremost experts—and they’re focused on what you need.

Products and Service You Can Rely On

SEL products are designed and manufactured for the world’s most challenging environments, exceeding all industry standards for temperature, shock, and electric stress. An optional conformal coating for circuit boards adds an extra level of protection against contaminants in extreme environments.

Every SEL product comes with a ten-year warranty—the best in the industry. If any product fails under warranty, we’ll repair or replace it for free.

Questions? Contact Us!

If you have any questions about SEL products, services, solutions, or support, please contact us. Our service and support professionals are ready to provide the answers you need.

Unbeatable Support

SEL support teams are stationed in regional offices around the world and staffed with application engineers who are experts in our products and in power system applications.

Technical support for SEL-manufactured devices is always free. No matter how often you need to call or how long your SEL products have been in service, you’ll reach an SEL expert who can provide the service and support you need.

Our cybersecurity team is always ready with the information and resources needed to keep your OT networks and critical systems secure and working effectively. Cyber services support contracts can include incident response, audits, system hardening, and more, depending on your anticipated needs.

More about SEL warranty and support