Bay Control and Substation Integration
Bay Control and Substation Protection Products
SEL bay control and protection solutions monitor and control your substation’s mission-critical equipment and functions—including double breakers, reclosing, breaker failure, and auxiliaries such as air break switches, grounding switches, and more.
SEL-451 Protection, Automation, and Bay Control System
Complete substation bay control with high-speed breaker protection and simplified settings in one economical system. Flexible bus configurations provide easy status and control of up to 20 disconnect switches and two breakers.
SEL-2240 Axion
A fully integrated, modular I/O and control solution. Choose a 4-slot or 10-slot base, and add communications and control modules to suit your needs. Whether your application calls for a remote terminal unit (RTU) or an ultra-rugged programmable logic controller (PLC), the SEL-2240 will be a good match.
Digital Secondary System (Digital Substation) Solutions
When your substation’s secondary system—the low-voltage equipment that controls and protects the substation’s high-voltage primary equipment—uses digital technology instead of analog circuits to transmit data between the instrument transformers and protective relays, it’s easier to install and your substation becomes safer.
To help you achieve these benefits, SEL offers two digital secondary system approaches: our innovative Time-Domain Link (TiDL) technology and an IEC 61850-9-2 Sampled Values (SV) solution.
Build an SEL TiDL Solution
SEL TiDL technology uses a point-to-point architecture to deliver a simple, secure solution. It is protection-centric, with no network engineering, no switched network, no external time source for protection, and minimum training requirements. TiDL is easy to implement and offers strong cybersecurity.
An SEL digital secondary system solution offers many advantages. You can:
- Increase safety by moving high-energy copper cables out of the control house and away from where people work.
- Reduce costs by decreasing the materials and labor required for wiring installation, commissioning, and documentation.
- Minimize misoperations due to wiring errors by reducing the number of physical routing paths and connections.
SEL-TMU
The SEL-TMU is a remote data acquisition device designed for use in an SEL Time-Domain Link (TiDL) technology system. Placed in the substation yard, the SEL-TMU digitizes analog signals from primary equipment and then transmits them via fiber-optic cable to SEL TiDL relays in the control house.
SEL-411L Advanced Line Differential Protection, Automation, and Control System
Apply the SEL-411L for complete protection and control of any transmission line. The SEL-411L provides differential protection with both phase- and sequence-based operating elements for sensitivity and high-speed operation.
SEL-421 Protection, Automation, and Control System
High-speed distance and directional protection and complete control of a two-breaker bay—plus advanced automation and monitoring capability. Use it in a TiDL solution by connecting it to an SEL-TMU TiDL Merging Unit.
SEL-451 Protection, Automation, and Bay Control System
Complete substation bay control with high-speed breaker protection and simplified settings in one economical system. Flexible bus configurations for easy status and control of up to 20 disconnect switches and two breakers. Use it in a TiDL solution by connecting it to an SEL-TMU TiDL Merging Unit.
SEL-487B Bus Differential and Breaker Failure Relay
Low-impedance bus differential fault detection, dynamic zone configuration, backup overcurrent protection, and integrated circuit breaker failure detection with station automation features. Use it in a TiDL solution by connecting it to an SEL-TMU TiDL Merging Unit.
SEL-487E Transformer Protection Relay
Comprehensive protection, metering, monitoring, and automation for power transformer applications. Use it in a TiDL solution by connecting it to an SEL-TMU TiDL Merging Unit.
Build an IEC 61850-9-2 SV Solution
The SEL SV solution is a communications-centric, interoperable IEC 61850-9-2 option for modernizing your substation’s secondary systems that includes merging units with built-in protection.
SEL-401 Protection, Automation, and Control Merging Unit
Publish SV data to the process bus network, and use the built-in phase-overcurrent and breaker failure protection to provide backup protection in case of communications system failures.
SEL-421 Protection, Automation, and Control Merging Unit
Publish SV data to the process bus network, and use the built-in line protection to increase speed and reliability as well as duplicate the data streams for redundant protection.
SEL-411L Advanced Line Differential Protection, Automation, and Control System
Apply the SEL-411L for complete protection and control of any transmission line. The SEL-411L provides differential protection with both phase- and sequence-based operating elements for sensitivity and high-speed operation.
SEL-421 Protection, Automation, and Control System
Protect any transmission line using a combination of five zones of phase- and ground-distance and directional overcurrent elements.
SEL-451 Protection, Automation, and Bay Control System
Use this relay with an SV merging unit to provide complete substation bay control with high-speed breaker protection and simplified settings in one economical system. Flexible bus configurations provide easy status and control of up to 20 disconnect switches and two breakers.
SEL-487B Bus Differential and Breaker Failure Relay
Use this relay with an SV merging unit to provide low-impedance bus differential fault detection, dynamic zone configuration, backup overcurrent protection, and integrated circuit breaker failure detection with station automation features.
SEL-487E Transformer Protection Relay
Use this relay with an SV merging unit to provide comprehensive protection, metering, monitoring, and automation for power transformer applications.
SEL-2740S Software-Defined Network Switch
The industry’s first field-hardened software-defined networking (SDN)-enabled switch. High-speed failover maintains your IEC 61850 protection systems, even during equipment failures. Use it in an SV solution to provide centralized traffic engineering and improve Ethernet performance.
SEL-2488 Satellite-Synchronized Network Clock
Receive Global Navigation Satellite System (GNSS) time signals, and distribute precise time via multiple output protocols, including IRIG-B and the Network Time Protocol (NTP).
Engineering Services
Let us partner with you to create an SEL solution for your system. From engineering studies and system design through commissioning and training, SEL engineers bring inventiveness and a deep understanding of the fundamental principles of electric power systems to every project. No matter how complex or sophisticated the system, we can help you protect, simplify, and control it.
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!
We’re happy to answer all your questions and help develop the best solution for your needs.
Unbeatable Support
Every SEL solution comes with lifetime technical support, free of charge.
There are no service contracts, time limits, or expiration dates. No matter how often you call or how long your SEL products have been in service, you’ll reach a friendly human who can provide the service and support you need.
Our 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. We’re always ready with the information and resources needed to keep your SEL solution working effectively.