html{display:none} Distribution | Schweitzer Engineering Laboratories

Solutions

Distribution

We ensure the reliability, resiliency, and safety of the electric distribution grid.

SEL provides solutions and services that protect, control, and optimize electric power distribution systems—helping our customers deliver safe, reliable power to people around the globe.

Distribution

Our Approach

We simplify the protection, optimization, and restoration of distribution systems.

Substation Pictogram

Our Solutions

Systems and products that protect, control, automate, and optimize electric power distribution.

Our Services

Achieve your operating goals with custom-engineered solutions and services supported by a global network of application engineers.

Our Support

We strive to be not just a vendor, but a partner you can rely on.

Reliability Is What Matters Most

Our approach to distribution solutions focuses on developing and delivering technologies that support and simplify the continuous cycle of protecting, restoring, and optimizing the power grid.

High-density coordination (HDC) makes it easier to deploy more recloser controls to improve reliability—without introducing additional complexity.

We believe automation should make systems simpler, not more complex, so we created a FLISR solution that can be deployed by simply defining your feeder topology and doesn't require complex modeling. Secure communications and intelligent controls and sensors make it easier to optimize power system efficiency.

These technologies and innovations are geared to help you minimize outages, restore power faster, and make better use of time and money when upgrading power systems—all to improve reliability.

From our knowledge base:

Reliability Is What Matters Most

Our approach to distribution solutions focuses on developing and delivering technologies that support and simplify the continuous cycle of protecting, restoring, and optimizing the power grid.

High-density coordination (HDC) makes it easier to deploy more recloser controls to improve reliability—without introducing additional complexity.

We believe automation should make systems simpler, not more complex, so we created a FLISR solution that can be deployed by simply defining your feeder topology and doesn't require complex modeling. Secure communications and intelligent controls and sensors make it easier to optimize power system efficiency.

These technologies and innovations are geared to help you minimize outages, restore power faster, and make better use of time and money when upgrading power systems—all to improve reliability.

From our knowledge base:

Reducing Complexity With Automation

At its core, automation should be simple and intuitive. There must be a foundation of trust between the human and the machine—we need to be confident that the machine will do what we intended.

To achieve that, automation should mirror our human experience. If we can’t talk to a machine the way we communicate with another human, we should at least be able to interact with it the way we interact with other tools, like a whiteboard.

Automation should enable us to answer “what if” questions for every situation—before it occurs. Since these systems are doing jobs that humans used to do, we need to know that we can trust them at least as much as we routinely trust our human colleagues.

We have created two solutions for distribution systems that reflect this philosophy: high-density coordination (HDC) and fault location, isolation, and service restoration (FLISR).

From our knowledge base

Reducing Complexity With Automation

At its core, automation should be simple and intuitive. There must be a foundation of trust between the human and the machine—we need to be confident that the machine will do what we intended.

To achieve that, automation should mirror our human experience. If we can’t talk to a machine the way we communicate with another human, we should at least be able to interact with it the way we interact with other tools, like a whiteboard.

Automation should enable us to answer “what if” questions for every situation—before it occurs. Since these systems are doing jobs that humans used to do, we need to know that we can trust them at least as much as we routinely trust our human colleagues.

We have created two solutions for distribution systems that reflect this philosophy: high-density coordination (HDC) and fault location, isolation, and service restoration (FLISR).

From our knowledge base

The Simplicity of Pre-Engineered Solutions

The diverse array of equipment, feeder topologies, applications, and more that all must reliably work together in distribution systems is not only a challenge in itself, but also a complicating factor in the process of adopting and deploying new technologies.

This is why the search for simplicity is a foundational tenet of our research and development approach.

We took a hard look at the functionality expectations and complexity of today’s protective devices. Everyone operates their system a little differently, and we want to make it easier to incorporate new technologies that can scale within a distribution system.

That’s why we’re creating design templates for what we call pre-engineered solutions.

These pre-engineered design templates can easily be adapted to match the operational expectations and philosophy of a particular system and are designed to be scaled up. The system works the same way on a single feeder and at scale. This makes it easier to initially deploy the technology in a limited capacity and quickly drive adoption at scale to improve reliability.

And when the system scales up and new functionality is added, personnel don’t have to be retrained—they have the confidence that they can quickly understand the state of the system and get the data needed to diagnose an event and restore service.

The Simplicity of Pre-Engineered Solutions

The diverse array of equipment, feeder topologies, applications, and more that all must reliably work together in distribution systems is not only a challenge in itself, but also a complicating factor in the process of adopting and deploying new technologies.

This is why the search for simplicity is a foundational tenet of our research and development approach.

We took a hard look at the functionality expectations and complexity of today’s protective devices. Everyone operates their system a little differently, and we want to make it easier to incorporate new technologies that can scale within a distribution system.

That’s why we’re creating design templates for what we call pre-engineered solutions.

These pre-engineered design templates can easily be adapted to match the operational expectations and philosophy of a particular system and are designed to be scaled up. The system works the same way on a single feeder and at scale. This makes it easier to initially deploy the technology in a limited capacity and quickly drive adoption at scale to improve reliability.

And when the system scales up and new functionality is added, personnel don’t have to be retrained—they have the confidence that they can quickly understand the state of the system and get the data needed to diagnose an event and restore service.

A Focus on Support

Our mission is not merely to sell products and systems, but to ensure that everyone has access to safe, reliable electric power.

That’s why we invest heavily in technical people—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 systems they support in the field.

An SEL solution doesn’t end with the sale, nor does it end with commissioning the system or training the operators. We will be there with you when the system goes live—and beyond. As long as your SEL products and solution remain in service—no matter how long that is—you have free access to direct technical support from SEL application engineers.

Our customer service reps and application engineers are stationed in regional offices around the world, so you can always count on reaching a friendly, knowledgeable human who can connect you with the resources you need.

From our knowledge base

A Focus on Support

Our mission is not merely to sell products and systems, but to ensure that everyone has access to safe, reliable electric power.

That’s why we invest heavily in technical people—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 systems they support in the field.

An SEL solution doesn’t end with the sale, nor does it end with commissioning the system or training the operators. We will be there with you when the system goes live—and beyond. As long as your SEL products and solution remain in service—no matter how long that is—you have free access to direct technical support from SEL application engineers.

Our customer service reps and application engineers are stationed in regional offices around the world, so you can always count on reaching a friendly, knowledgeable human who can connect you with the resources you need.

From our knowledge base

Improving Feeder Protection

Segmenting feeders by adding recloser controls is a highly effective way to reduce the number of customers exposed to permanent electrical outages.

However, in traditional time-overcurrent protection, there is a limit to how many reclosers can be deployed on a feeder before coordination margins become too tight.

SEL’s High-Density Coordination (HDC) solution solves that problem with an innovative, simplified protection scheme enabled by the SEL-651R Advanced Recloser Control.

How HDC Simplifies Protection

An HDC logic template in the SEL-651R coordinates the actions of any number of SEL-651R controls, allowing all of them to operate safely within the standard time-overcurrent protection curve. This lets you enable the full functionality of all your recloser controls and deploy as many as you need on any given feeder.

Flexible deployment options:

  • Apply HDC schemes in any feeder topology.
  • Implement with your existing communications infrastructure—or even without communications.
  • Deploy at scale or build out over time—simplified device deployment lets you add reclosers as needed.

Coordination groups keep time-overcurrent coordination simple and can be applied in any feeder topology.

The HDC scheme’s restoration logic allows you to deploy high-density coordination without an extended protection communications network. The scheme can easily be converted to take advantage of peer-to-peer communications if infrastructure is upgraded in the future.

High-density coordination (HDC) schemes also work in tandem with FLISR to provide a complete, simplified feeder protection and system restoration solution.

HDC With High-Speed Communications

Deploy an HDC scheme with protection-speed communications (IEC 61850 GOOSE protocol over Ethernet fiber) to reduce fault-clearing time, reduce flicker, improve power quality, and extend equipment life.

Faults are cleared in ten cycles or less, regardless of fault current magnitude or location. HDC restoration logic provides a fallback, resolving any potential miscoordinations if communications are lost. And the HDC scheme remains flexible and can easily accommodate additional reclosers and changes in feeder topology.

From our knowledge base

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Improving Feeder Protection

Segmenting feeders by adding recloser controls is a highly effective way to reduce the number of customers exposed to permanent electrical outages.

However, in traditional time-overcurrent protection, there is a limit to how many reclosers can be deployed on a feeder before coordination margins become too tight.

SEL’s High-Density Coordination (HDC) solution solves that problem with an innovative, simplified protection scheme enabled by the SEL-651R Advanced Recloser Control.

How HDC Simplifies Protection

An HDC logic template in the SEL-651R coordinates the actions of any number of SEL-651R controls, allowing all of them to operate safely within the standard time-overcurrent protection curve. This lets you enable the full functionality of all your recloser controls and deploy as many as you need on any given feeder.

Flexible deployment options:

  • Apply HDC schemes in any feeder topology.
  • Implement with your existing communications infrastructure—or even without communications.
  • Deploy at scale or build out over time—simplified device deployment lets you add reclosers as needed.

Coordination groups keep time-overcurrent coordination simple and can be applied in any feeder topology.

The HDC scheme’s restoration logic allows you to deploy high-density coordination without an extended protection communications network. The scheme can easily be converted to take advantage of peer-to-peer communications if infrastructure is upgraded in the future.

High-density coordination (HDC) schemes also work in tandem with FLISR to provide a complete, simplified feeder protection and system restoration solution.

HDC With High-Speed Communications

Deploy an HDC scheme with protection-speed communications (IEC 61850 GOOSE protocol over Ethernet fiber) to reduce fault-clearing time, reduce flicker, improve power quality, and extend equipment life.

Faults are cleared in ten cycles or less, regardless of fault current magnitude or location. HDC restoration logic provides a fallback, resolving any potential miscoordinations if communications are lost. And the HDC scheme remains flexible and can easily accommodate additional reclosers and changes in feeder topology.

From our knowledge base

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Scalable Automation Solutions

With innovations born from decades of advancing the science of protection and control, the new SEL automation solutions simplify deployment and are scalable to meet future demands.

A Simpler, More Scalable FLISR Solution

The distribution management system (DMS) software suite on the SEL Blueframe automation application platform lets you deploy and scale up FLISR schemes with ease. Automate and simplify wide-area control with intelligent system restoration that reduces outage times for customers downstream of a fault from hours to minutes or seconds.

The FLISR application is pre-engineered for simplified implementation and can scale to fit any distribution system:

  • Set up and run FLISR without complicated modeling—draw your feeder topology easily on a digital canvas in the included DMS Designer application.
  • Deploy in either centralized or distributed architectures.
  • Implement in stages if desired and scale up without adding complexity.

The SEL Blueframe Automation Platform

SEL Blueframe is a secure, scalable platform for running OT software applications—such as the SEL DMS suite.

The Blueframe platform allows a seamless exchange of data between applications, minimizes the frequency of patches and upgrades, and includes integrated security to prevent unauthorized access and potential attacks.

It can be embedded in the SEL-3350, SEL-3355, and SEL-3360 rugged computing platforms or virtualized on any server-grade hardware.

From our knowledge base

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Scalable Automation Solutions

With innovations born from decades of advancing the science of protection and control, the new SEL automation solutions simplify deployment and are scalable to meet future demands.

A Simpler, More Scalable FLISR Solution

The distribution management system (DMS) software suite on the SEL Blueframe automation application platform lets you deploy and scale up FLISR schemes with ease. Automate and simplify wide-area control with intelligent system restoration that reduces outage times for customers downstream of a fault from hours to minutes or seconds.

The FLISR application is pre-engineered for simplified implementation and can scale to fit any distribution system:

  • Set up and run FLISR without complicated modeling—draw your feeder topology easily on a digital canvas in the included DMS Designer application.
  • Deploy in either centralized or distributed architectures.
  • Implement in stages if desired and scale up without adding complexity.

The SEL Blueframe Automation Platform

SEL Blueframe is a secure, scalable platform for running OT software applications—such as the SEL DMS suite.

The Blueframe platform allows a seamless exchange of data between applications, minimizes the frequency of patches and upgrades, and includes integrated security to prevent unauthorized access and potential attacks.

It can be embedded in the SEL-3350, SEL-3355, and SEL-3360 rugged computing platforms or virtualized on any server-grade hardware.

From our knowledge base

B1Source BSource AR1R2R3R5R4

Recloser Control Applications 

Recloser controls are playing an increasingly central role in distribution system protection—and SEL recloser controls lead the way with innovative solutions that make protecting and controlling your distribution system both simpler and more reliable. 

Point of Common Coupling For DERS

The SEL-651R Advanced Recloser Control, with IEEE 1547-2018 compliant protection and synchronization, is an ideal way to protect and control the points of common coupling that interconnect distributed energy resources (DERs) and microgrids with the distribution grid. 

Connect DERs to the Grid With the SEL-651R

Sectionalizing Feeders and Coordinating Protection

Sectionalizing feeders by adding recloser controls is one of the best ways to improve reliability metrics.  

The High-Density Coordination logic template in the SEL-651R Advanced Recloser Controls allows you to deploy virtually any number of reclosers on a feeder—and use the advanced functions of every control—without adding complexity to the protection scheme.

High-Impedance Fault (HIF) Detection

With optional SEL Arc Sense Technology (AST), the SEL-651R and SEL-651RA recloser controls can help you keep your customers safe by securely detecting and clearing more high-impedance faults. 

Patented AST logic makes HIF detection easy to set and test.

More About HIF Detection

High-speed Load Transfer

Use SEL recloser controls to apply automatic source transfer schemes for critical loads that require dual feeder service.  

With communications in place, the recloser controls communicate securely to share status and protection logic, allowing transfer to occur only on non-faulted loads and ensuring safe return-to-normal action.

Intelligent Tripping and Reclosing with Fault Transmitters 

Combine SEL Wireless Protection System components with recloser controls for more intelligent protection.

The fault transmitters and repeaters—located as needed on branches, laterals, and the main line—wirelessly communicate to the receiver and the SEL-651R within 6 ms. This allows both fast tripping for main-line faults and fuse-saving and fuse-blowing schemes to be applied on the same feeder.

From our knowledge base

Recloser Control Applications 

Recloser controls are playing an increasingly central role in distribution system protection—and SEL recloser controls lead the way with innovative solutions that make protecting and controlling your distribution system both simpler and more reliable. 

Point of Common Coupling For DERS

The SEL-651R Advanced Recloser Control, with IEEE 1547-2018 compliant protection and synchronization, is an ideal way to protect and control the points of common coupling that interconnect distributed energy resources (DERs) and microgrids with the distribution grid. 

Connect DERs to the Grid With the SEL-651R

Sectionalizing Feeders and Coordinating Protection

Sectionalizing feeders by adding recloser controls is one of the best ways to improve reliability metrics.  

The High-Density Coordination logic template in the SEL-651R Advanced Recloser Controls allows you to deploy virtually any number of reclosers on a feeder—and use the advanced functions of every control—without adding complexity to the protection scheme.

High-Impedance Fault (HIF) Detection

With optional SEL Arc Sense Technology (AST), the SEL-651R and SEL-651RA recloser controls can help you keep your customers safe by securely detecting and clearing more high-impedance faults. 

Patented AST logic makes HIF detection easy to set and test.

More About HIF Detection

High-speed Load Transfer

Use SEL recloser controls to apply automatic source transfer schemes for critical loads that require dual feeder service.  

With communications in place, the recloser controls communicate securely to share status and protection logic, allowing transfer to occur only on non-faulted loads and ensuring safe return-to-normal action.

Intelligent Tripping and Reclosing with Fault Transmitters 

Combine SEL Wireless Protection System components with recloser controls for more intelligent protection.

The fault transmitters and repeaters—located as needed on branches, laterals, and the main line—wirelessly communicate to the receiver and the SEL-651R within 6 ms. This allows both fast tripping for main-line faults and fuse-saving and fuse-blowing schemes to be applied on the same feeder.

From our knowledge base

Communications and Cybersecurity

There are many benefits to incorporating communications into your distribution systems—not only substation LAN, but also wide-area communications. With secure communications throughout the distribution system, you can:

  • Locate faults and start fixing outages immediately.
  • Meter and manage power quality.
  • Balance loads better.
  • Improve protection speed and coordination with high-speed communications.
  • Implement advanced data collection and improve your system’s efficiency.

MACSEC: Secure Encryption for Recloser Controls

To answer the need for comprehensive security not only in recloser controls, but also in existing cabinets, SEL incorporates the IEEE MACsec encryption standard in the SEL-651R and SEL-651RA recloser controls. It is also available as a firmware upgrade for existing SEL-651R controls.

To secure communications, a security gateway and recloser control are deployed together in the recloser cabinet. This provides secure communications both inside the cabinet and at every hop outside it, regardless of distance.

MACsec security requires minimal configuration and reduces complexity within the recloser control. And because the MACsec standard requires fewer updates than protocols such as Transport Layer Security (TLS) or IPsec), the recloser control needs fewer firmware updates—which reduces operation expenditures throughout the life cycle of the device.

Software-Defined Networking (SDN) For OT Communications

SEL’s operational technology (OT) software-defined networking (SDN) solution is the only networking solution on the market that is purpose-engineered for critical infrastructure.

A true deny-by-default solution, OT SDN allows the operator to define all communication flows and specify exactly what type of traffic and devices are allowed on the network. This offers significant advantages:

  • Stronger cybersecurity than traditional Ethernet architectures.
  • Transparent situational awareness of all authorized devices and conversations.
  • Simplified configuration and lower maintenance costs.
  • Assurance that critical OT devices such as protective relays will remain available and responsive.

Perimeter Security and Access Control

Every “smart” device added to the system has the potential to increase vulnerability to cyber-attacks. Security gateways help reduce vulnerabilities by establishing an electronic security perimeter, providing secure remote access, and centrally managing passwords.

SEL security gateways and other secure access products are specifically designed to create cybersecure OT networks that function seamlessly with the IEDs that protect your systems. The robust cybersecurity features integrated into these products have been proven in substations around the world.

From our knowledge base

 cSecurity gateway SEL-651RIPsecMACsec

Communications and Cybersecurity

There are many benefits to incorporating communications into your distribution systems—not only substation LAN, but also wide-area communications. With secure communications throughout the distribution system, you can:

  • Locate faults and start fixing outages immediately.
  • Meter and manage power quality.
  • Balance loads better.
  • Improve protection speed and coordination with high-speed communications.
  • Implement advanced data collection and improve your system’s efficiency.

MACSEC: Secure Encryption for Recloser Controls

To answer the need for comprehensive security not only in recloser controls, but also in existing cabinets, SEL incorporates the IEEE MACsec encryption standard in the SEL-651R and SEL-651RA recloser controls. It is also available as a firmware upgrade for existing SEL-651R controls.

To secure communications, a security gateway and recloser control are deployed together in the recloser cabinet. This provides secure communications both inside the cabinet and at every hop outside it, regardless of distance.

MACsec security requires minimal configuration and reduces complexity within the recloser control. And because the MACsec standard requires fewer updates than protocols such as Transport Layer Security (TLS) or IPsec), the recloser control needs fewer firmware updates—which reduces operation expenditures throughout the life cycle of the device.

Software-Defined Networking (SDN) For OT Communications

SEL’s operational technology (OT) software-defined networking (SDN) solution is the only networking solution on the market that is purpose-engineered for critical infrastructure.

A true deny-by-default solution, OT SDN allows the operator to define all communication flows and specify exactly what type of traffic and devices are allowed on the network. This offers significant advantages:

  • Stronger cybersecurity than traditional Ethernet architectures.
  • Transparent situational awareness of all authorized devices and conversations.
  • Simplified configuration and lower maintenance costs.
  • Assurance that critical OT devices such as protective relays will remain available and responsive.

Perimeter Security and Access Control

Every “smart” device added to the system has the potential to increase vulnerability to cyber-attacks. Security gateways help reduce vulnerabilities by establishing an electronic security perimeter, providing secure remote access, and centrally managing passwords.

SEL security gateways and other secure access products are specifically designed to create cybersecure OT networks that function seamlessly with the IEDs that protect your systems. The robust cybersecurity features integrated into these products have been proven in substations around the world.

From our knowledge base

 cSecurity gateway SEL-651RIPsecMACsec

Distribution Automation 

SEL Engineering Services provides turnkey distribution automation control solutions.

Our engineers will install and configure the SEL DMS Suite, including scalable FLISR systems and data management and automation (DMA) solutions.

In addition to DMS solutions, SEL Engineering Services teams also:

  • Install reclosers and set up High Density Coordination schemes that improve feeder protection.
  • Design and implement complete substation automation solutions.
  • Mitigate public safety hazards with solutions for high-impedance fault (HIF) and falling-conductor detection.

Distribution Automation 

SEL Engineering Services provides turnkey distribution automation control solutions.

Our engineers will install and configure the SEL DMS Suite, including scalable FLISR systems and data management and automation (DMA) solutions.

In addition to DMS solutions, SEL Engineering Services teams also:

  • Install reclosers and set up High Density Coordination schemes that improve feeder protection.
  • Design and implement complete substation automation solutions.
  • Mitigate public safety hazards with solutions for high-impedance fault (HIF) and falling-conductor detection.

Networking and Cybersecurity 

SEL provides services and solutions that incorporate cybersecurity best practices and keep your critical electric power infrastructure secure.

Our communications and cybersecurity solutions and services include:

  • Remote access configuration and IED password management
  • Centralized enterprise management integration  
  • System-specific training in security awareness, security operations, and configuration of select SEL devices
  • Firmware and software patch management
  • Supply chain risk management

We can also test, design, and implement complete OT networking solutions that comply with any cybersecurity standards that may apply to you.

Networking and Cybersecurity 

SEL provides services and solutions that incorporate cybersecurity best practices and keep your critical electric power infrastructure secure.

Our communications and cybersecurity solutions and services include:

  • Remote access configuration and IED password management
  • Centralized enterprise management integration  
  • System-specific training in security awareness, security operations, and configuration of select SEL devices
  • Firmware and software patch management
  • Supply chain risk management

We can also test, design, and implement complete OT networking solutions that comply with any cybersecurity standards that may apply to you.

Our experienced engineering teams work closely with you throughout the design, testing, and commissioning process. We work to understand your operational goals—and deliver solutions that let you achieve them.

System Modeling and Design

We use advanced modeling and simulation, informed by decades of power engineering experience, to analyze system requirements, validate power system designs, and optimize the performance of the system through the devices that protect and control it.

Factory Acceptance Testing

Our factory acceptance tests use advanced hardware-in-the-loop (HIL) control system testing to verify that protection and control functions will perform exactly as designed.

With the actual protection and control hardware that will be installed in your system wired into our Real Time Digital Simulator (RTDS) test bed, we use our extensive library of validated software models to test the system’s response to thousands of faults and adverse scenarios.

This provides data equivalent to years of operational history in only a few days and helps us ensure that commissioning of the system goes smoothly.

Commissioning and Training

SEL-engineered solutions include commissioning, training, and technical support.

We train your engineers and operators, ensuring that they’re comfortable and confident with your new system. And afterward, whenever you need technical support, our worldwide network of application engineers is ready to assist, free of charge.

Our experienced engineering teams work closely with you throughout the design, testing, and commissioning process. We work to understand your operational goals—and deliver solutions that let you achieve them.

System Modeling and Design

We use advanced modeling and simulation, informed by decades of power engineering experience, to analyze system requirements, validate power system designs, and optimize the performance of the system through the devices that protect and control it.

Factory Acceptance Testing

Our factory acceptance tests use advanced hardware-in-the-loop (HIL) control system testing to verify that protection and control functions will perform exactly as designed.

With the actual protection and control hardware that will be installed in your system wired into our Real Time Digital Simulator (RTDS) test bed, we use our extensive library of validated software models to test the system’s response to thousands of faults and adverse scenarios.

This provides data equivalent to years of operational history in only a few days and helps us ensure that commissioning of the system goes smoothly.

Commissioning and Training

SEL-engineered solutions include commissioning, training, and technical support.

We train your engineers and operators, ensuring that they’re comfortable and confident with your new system. And afterward, whenever you need technical support, our worldwide network of application engineers is ready to assist, free of charge.

The Industry’s Best Warranty

SEL devices are designed for a working life of at least 20 years, and every SEL-manufactured device comes with a ten-year warranty—the best in the electric power industry. If it fails under warranty, repair and replacement are free.

We always do all that we can to repair any returned product, whether it meets our warranty or not.

Rugged and Reliable – Guaranteed

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.

Our products have a mean time between returns for repair (MTBR) of more than 250 years, based on observed field performance. This means that if you have 250 SEL products installed in your systems, you can expect to have less than one unscheduled removal from service per year for any reason, whether it’s a defect or an external factor such as overvoltage, overcurrent, wildlife damage, or environmental exposure.

The Industry’s Best Warranty

SEL devices are designed for a working life of at least 20 years, and every SEL-manufactured device comes with a ten-year warranty—the best in the electric power industry. If it fails under warranty, repair and replacement are free.

We always do all that we can to repair any returned product, whether it meets our warranty or not.

Rugged and Reliable – Guaranteed

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.

Our products have a mean time between returns for repair (MTBR) of more than 250 years, based on observed field performance. This means that if you have 250 SEL products installed in your systems, you can expect to have less than one unscheduled removal from service per year for any reason, whether it’s a defect or an external factor such as overvoltage, overcurrent, wildlife damage, or environmental exposure.

Lifetime Product Support

Every device we manufacture comes with free lifetime technical 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.

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. 

Security Bulletins and Updates

We notify product owners of updates and security patches for the full life of the product. Software and firmware updates are distributed directly to our customers via secure file transfer, and their authenticity and integrity are verifiable through digital signatures and cryptographic hashes. 

More About Security Notifications

SEL Process for Disclosing Security Vulnerabilities

Lifetime Product Support

Every device we manufacture comes with free lifetime technical 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.

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. 

Security Bulletins and Updates

We notify product owners of updates and security patches for the full life of the product. Software and firmware updates are distributed directly to our customers via secure file transfer, and their authenticity and integrity are verifiable through digital signatures and cryptographic hashes. 

More About Security Notifications

SEL Process for Disclosing Security Vulnerabilities

Cybersecurity

SEL offers complete cybersecurity support for every solution, system, and product we provide.

We also practice secure supply chain management and help our customers comply with applicable supply chain and cybersecurity standards (for instance, NERC CIP-013 for certain North American utilities).

Security Bulletins and Updates

We thoroughly review and test the code in our products, which allows us greater control over their quality, security, and functionality. Customers are notified of updates and security patches for the full life of every SEL product.

Cyber Attack Mitigation

We freely provide a broad set of cybersecurity best practices that you and your team can begin using immediately to improve the security of your systems and mitigate the risk of a damaging cyber attack. 

And if you need to meet regulatory requirements or need expert help implementing cybersecurity solutions, SEL Cyber Services professionals are ready to partner with you to get it done.

Cybersecurity Services and Support

From system assessment and baselining to cyber-defense solution development and ongoing system management, our full suite of security services can help strengthen your defenses and streamline the demands of maintenance and compliance.

Cyber services support contracts can include incident response, audits, system hardening, patch/update management, and more, depending on your anticipated needs.

Contact SEL Cyber Services

Cybersecurity

SEL offers complete cybersecurity support for every solution, system, and product we provide.

We also practice secure supply chain management and help our customers comply with applicable supply chain and cybersecurity standards (for instance, NERC CIP-013 for certain North American utilities).

Security Bulletins and Updates

We thoroughly review and test the code in our products, which allows us greater control over their quality, security, and functionality. Customers are notified of updates and security patches for the full life of every SEL product.

Cyber Attack Mitigation

We freely provide a broad set of cybersecurity best practices that you and your team can begin using immediately to improve the security of your systems and mitigate the risk of a damaging cyber attack. 

And if you need to meet regulatory requirements or need expert help implementing cybersecurity solutions, SEL Cyber Services professionals are ready to partner with you to get it done.

Cybersecurity Services and Support

From system assessment and baselining to cyber-defense solution development and ongoing system management, our full suite of security services can help strengthen your defenses and streamline the demands of maintenance and compliance.

Cyber services support contracts can include incident response, audits, system hardening, patch/update management, and more, depending on your anticipated needs.

Contact SEL Cyber Services

Training and Education

SEL meets your workforce training and continuing-education needs through seminars, conference and tradeshow presentations, and SEL University courses.

SEL University—an IACET-accredited provider—offers continuing education units (CEUs) that meet the internationally recognized ANSI/IACET Continuing Education and Training Standard.

SELU courses and many of our seminars provide professional development hours (PDHs) for maintaining Professional Engineering (P.E.) licenses. Courses and seminars can be delivered in various formats, including self-paced online learning, virtual classrooms, live and recorded webinars, and in person.

We can also work with you to develop training that is customized to the specific needs of your workforce.

Training and Education Offerings

Training and Education

SEL meets your workforce training and continuing-education needs through seminars, conference and tradeshow presentations, and SEL University courses.

SEL University—an IACET-accredited provider—offers continuing education units (CEUs) that meet the internationally recognized ANSI/IACET Continuing Education and Training Standard.

SELU courses and many of our seminars provide professional development hours (PDHs) for maintaining Professional Engineering (P.E.) licenses. Courses and seminars can be delivered in various formats, including self-paced online learning, virtual classrooms, live and recorded webinars, and in person.

We can also work with you to develop training that is customized to the specific needs of your workforce.

Training and Education Offerings

Customer Highlights

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Distribution Modernization in Kentucky

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Pend Oreille Utility Benefits From Innovative RTU Upgrade Strategy

Mississippi Power - Featured

Self-Healing Network Restores Power Fast

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Distribution Automation Controller (DAC) Helps AEP Advance Customer Service

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Distribution Automation: Westar Improves Reliability, Conserves Energy

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