Generation solutions from SEL help increase power system resiliency.

Our Approach

We help protect, control, and monitor critical infrastructure starting at the generation source.
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Our Solutions

Products and systems that work together to securely and reliably integrate into new or existing plant control systems.
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Our Services

Strengthen your defenses and streamline maintenance and compliance.
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Our Support

We support everything from traditional generation sources to renewables to full microgrid control systems.
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Our Approach

Generation is the beginning of everything in the electrical world. It is where mechanical energy gets converted to electrical energy through a complex system of prime movers, generators, transformers, inverters, sensors, and more. Without generation there is no transmission, distribution, or industrials.

Fundamentally, we need to generate electric power to meet the demand the moment it’s needed. That energy conversion starts at the generation source. The addition of renewables, retirement of traditional generation sources, and the sheer expanse of increasing power demands create a need for more reliable, efficient, and simple generation solutions.

Building Blocks of Generation Protection

As the starting point of the power grid, generation systems require a strong foundation built on protection. Properly protecting generators requires a wide variety of protection functions as they may suffer different faults and other abnormal operating conditions. Generation system protection needs to be reliable, which implies being both dependable and secure. Dependability means detecting any abnormality (such as faults or other abnormal conditions) which could damage the generator, exciter, prime mover, or auxiliary system when something goes wrong. The protection system must disconnect the generation unit before it suffers any damage.

Security means allowing the generator to stay online during any conditions that don’t compromise its normal operation—like external faults with CT saturation, for example. Protection system security increases the generation continuity of service.

The faster your protection system responds the faster you protect your people and equipment. Through protection innovations like advanced stator ground fault detection and universal differential elements, we're now able to get ahead of a fault and identify it faster than previously ever thought possible.

From our knowledge base

Our Solutions

SEL continues to innovate in the space of generation. We were the first to reimplement analog protection functions into digital relays, and then added in new features—like auto synchronization—to reduce cost and complexity of installation. We also added a loss-of-field element based on the generator capability curve in our generator protection relays, allowing the user to set multiple zones to prevent generator damage. We have designed new protection approaches that allow for redundant stator protection.

Our solutions are designed to protect the pieces you already have in place and add in more elements as your needs grow.


Power system stability is key to a successful generation solution. You’re not just protecting the generator, you’re making sure that generator protection response doesn’t negatively impact the power grid while also meeting NERC PRC requirements. If the protection isn’t reliable, then you risk the loss of a generator, or worse, a widespread blackout. You can’t prevent a fault from happening, but when equipped with the tools to respond quickly, you minimize damage and ultimately keep the power on for everyone.

Our generation protection solutions provide both primary and backup protection for generators, transformers, and bus bars, as well as motors, feeders, and other equipment through technologies and features such as advanced stator and rotor fault protection, innovative protection against abnormal operating conditions, and autosynchronization.

Employing these SEL protection solutions helps customers enhance generation system performance and health and increase availability while avoiding potential equipment damage or failure. They also provide safe power system interconnections with renewable energy sources.

From our knowledge base


Protect and synchronize generators and their connection to the transmission grid. Steam/thermal plants have some of the largest generators in the power system and require comprehensive protection.

Combined Cycle

Reliable solutions to protect and control gas turbines and power plant systems. These units often operate during peak periods, requiring frequent starts and stops that may have unique protection requirements during starting.


Upgrade your protection system and implement automation and control schemes to improve efficiency, reliability, and safety. Hydro generators can vary greatly in size. Small hydro units may share a common bus which complicates the application of ground fault protection.


Monitor and coordinate wind turbine networks, maximize efficiency of output, and integrate generation with the utility grid.


Track and control solar installations and safely interconnect them with the utility grid.

Industrial Generators and Electrical Plant Balance

Protect your generation assets and increase the reliability, safety, and efficiency of your plant’s power system with an SEL solution.


Optimize the resiliency and cost of any generation source or energy storage solution. Our microgrid control systems are designed to reduce capital expenditure, simplify integration and commissioning, and improve overall system resilience.


Modernize and upgrade the systems that protect and control nuclear power generation with advanced digital relays qualified for safety-related applications.

Our Services

SEL is your partner in implementing generation solutions and tailoring them to your system priorities and requirements. We support new and existing plants as well as the integration of renewables and microgrids.

Consulting Services

Industry-leading expertise on electric power system dynamics, protection, automation, and control.
Capabilities range from design-stage consulting and hardware-in-the-loop (HIL) testing to delivering turnkey power management systems. SEL employs hundreds of power system engineers around the globe who have designed complex power systems in industries such as mining, data centers, and oil and gas.

Protection Services

All forms of electric power system modeling and studies.
These services include load-flow, short-circuit, and stability studies for equipment sizing, scheme design, protection coordination, and arc-flash protection. Our teams also provide HIL testing for both protection and control systems.

Synchronization Systems

Both custom and pre-engineered synchronization systems.
These systems automatically reduce voltage differences, phase angles, and slip before automatically closing a circuit breaker. The systems send control set points to any number of generators or inverters, and an SEL relay at each point of coupling automatically closes the circuit breaker once acceptable voltage differences, phase angles, and slip are detected.

Automation and SCADA Systems

We design, develop, test, and deploy complete SCADA systems to monitor and control.
Our engineers can work with legacy equipment, provide new SEL equipment, or integrate both to create an economical, high-quality system.

Select from multiple designs for asset optimization, load shedding, load restoration, outage management, predictive maintenance, access control, cybersecurity, and more.

Our Support

We believe you should never have to worry about whether your protection and control systems will be working when you need them most. SEL products are designed and manufactured for the world’s most challenging environments, exceeding all industry standards for temperature, shock, and electric stress, which has led to one of the highest MTBF ratings in the industry.

However, sometimes the unexpected happens. That’s why you always have access to SEL engineers—and every device we manufacture comes with a ten-year warranty and no-cost technical support.

After your systems are commissioned, our application engineers provide technical support for SEL products at no cost.

As long as your SEL products remain in service, you have access to direct technical support from SEL engineers—not just a handful of customer-facing product engineers, but a large corps of application engineers who are intimately familiar with the way our devices are deployed and the functions they typically perform in the field.

No matter how often you need to call or how long your SEL products have been in service, our customer service and technical support professionals are ready to help.

Customer support staff and application engineers are stationed in regional offices across North America and around the world.

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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