Engineering Services


Take advantage of SEL’s expertise in protection systems and hardware by having our engineers specify, design, implement, test, and commission your protection systems.

No matter where you are in the world, SEL will deliver the industry’s most reliable protection solutions—backed by the industry’s best product warranty and customer support.

We provide all the design documentation, testing procedures, and settings reports needed to operate and maintain your SEL solution.

Key Offerings

  • Protection scheme designs
  • Relaying standards development
  • Arc-flash studies
  • Testing, commissioning, and on-site training
  • Generator synchronizing systems
  • NERC Protection and Control (PRC) compliance
  • CT sizing
  • Fault, coordination, and selectivity studies

System Modeling and Studies

SEL engineering teams have the software and equipment necessary to model any power system and operating scenario. We can systematically test a multitude of faults and adverse scenarios, resulting in fewer risks in planning and commissioning, better reliability, and a lower lifetime operating cost.

We own and operate the largest for-lease controller hardware-in-the-loop (HIL) testing facility in North America. We have also developed the electric power industry’s largest library of verified models, which allows us to test protection and control systems under realistic conditions.

These models are used for arc-flash, feasibility, volt/VAR optimization, equipment sizing, scheme design, and stability studies and for verifying the functionality and reliability of the solutions we provide for you.

Protection System Testing

Improve power system performance in critical applications, validate protective relay performance, and optimize relay settings.

SEL will create a Real Time Digital Simulator (RTDS) model of your power system, distributed energy resources, and loads. Protective relays are then physically wired to the RTDS to simulate realistic conditions. We then compare model results and calculated values against the equipment’s ratings to verify that the system is safe and protected.

NERC PRC Compliance for North American Utilities

Let North America’s leading electric power experts help your transmission and generation protection comply with NERC Protection and Control (PRC) standards.

SEL Engineering Services can provide a full range of audit-ready compliance deliverables—from data collection to mitigation plans and audit documentation—for both new and existing systems.

Industry-Leading Protection Technologies

Substation Solutions

SEL offers a secure, simple solution for digitizing the secondary systems that protect your substation’s primary equipment. Our Time-Domain Link (TiDL) substation solution requires no network engineering, no external time source, and no Ethernet switch. With TiDL, all you need is one direct fiber connection between each of the field modules and the relay in your control house.

Substation Engineering Services

Our experienced project management team provides cost estimates, permitting, scheduling, reporting, and procurement services for power and substation design projects. Our licensed professional engineers will walk your team through the budgeting, design, construction, and testing process.

Key Offerings:

  • Studies
  • Design
  • Procurement
  • Demolition
  • Project management
  • Construction management

SEL has licensed engineers with expertise in electrical, power, protection, automation, control, networking, cybersecurity, mechanical, and civil applications.

Our Support

Quality and Security You Can Rely On

All of our products are designed, tested, and manufactured in SEL-owned and -operated facilities in North America.

The SEL Engineering Services team follows rigorous engineering procedures for design, development, testing, and commissioning of electric power systems. We continually identify, monitor, and improve best practices to ensure your satisfaction.

We practice secure supply chain management, including verified chains of custody, responsible sourcing, and keeping quantities of critical parts in reserve. Our quality management system is certified to ISO 9001 Quality Management System requirements.

Unbeatable Support

When you choose SEL, you get more than products and services—you get a partnership. Our customer support teams are experts in power system products and applications, and they’re available for the entire life of your SEL solution.

Engineering Services project engineers are ready to assist you in various project stages from planning through final commissioning of the system. Afterward, you have access to technical support from SEL application engineers, at no charge, as long as SEL products remain in service.

Questions? Contact Us!

An SEL representative will follow up with you directly. We’re happy to answer all your questions and help you find the best solution for your needs.