SEL is a leader in delivering scalable, modular distribution automation systems that meet your specific requirements and offers comprehensive turnkey solutions or provides individual components for utilities that want to build their own systems. SEL DNA systems combine fast protection with flexible automation control and communications for a distribution automation solution that makes your system safer, more reliable, and more economical.
Maintaining the safe operation of the power system is a top priority for every utility. All DNA systems are built with the philosophy that protection is the top priority and includes preserving coordination with reconfiguration. DNA systems also use new methods, such as Arc Sense technology (AST), allowing detection of more faults than ever before. AST-equipped substation relays and recloser controls can detect high-impedance faults that cannot be detected with conventional distribution protection, reducing the risk of electrocution or fires from downed conductors.
Keeping the lights on and having a high level of reliability is not just a desire, but a necessity for many utility customers. DNA systems include automated reconfiguration schemes and provide the highest level of reliability by sectionalizing the smallest portion of the system when a fault occurs and maintaining service elsewhere. Automatic network reconfiguration allows the distribution system to “self-heal,” keeping the lights on for most consumers and rerouting power automatically around one or more faulted areas. Additionally, fault location technology quickly guides crews to the fault point so repairs can be made and service restored more quickly.
Improving the efficient operation of the distribution system is one of the most cost-effective ways to meet the ever-changing demands on the grid. The amount of load on the distribution system is constantly changing, and the stresses this puts on the system will likely intensify with new loads and sources, like plug-in electric vehicles (PEVs) and distributed generation (DG). Volt/VAR control is one of the most cost-effective means to improve distribution efficiency and reduce system losses. SEL DNA systems can include capacitor and voltage regulator controls to flatten the voltage profile along feeders. This improves power factor and reduces system losses, thus improving the customer experience and reducing your energy costs.
DNA systems offer a comprehensive set of capabilities that improve reliability, increase system operational efficiency, and reduce operating costs. Systems may include a broad set of functionalities or a subset that address your specific needs. The scalable, modular approach allows capabilities to be added over time, growing with your distribution automation needs. A distribution automation controller (DAC) provides centralized or distributed intelligence and control. Larger systems use one or more DACs and exchange information for optimal system control.
In addition to providing outstanding protection for your distribution system and equipment, DNA systems use SEL relays as one of the fundamental building blocks. This allows DNA systems to be economically added to existing distribution protection systems. Common relays used in DNA systems include the SEL-351 Protection System; SEL-451 Protection, Automation, and Bay Control System; SEL-751 Feeder Protection Relay; SEL-700GW Wind Generator Relay; and others.
DNA systems can use programming and logic in individual reclosers or relays, or use comprehensive programming implemented in distributed or centralized automation controllers that include real-time monitoring, graphical human-machine interfaces (HMIs), centralized event collection, etc. Using ruggedized real-time automation controllers, such as the SEL-3530 Real-Time Automation Controller (RTAC) or substation-rated computers, such as the SEL-3355 Computer, provides a powerful and reliable distribution automation system.
Both overhead and underground FCIs, such as the WSO—Wireless Sensor for Overhead Lines and the AR-URD—Underground AutoRANGER, can be added to an SEL DNA system. SEL offers both standalone and wireless FCIs that can greatly speed up locating the fault and reduce outage times.
SEL offers a variety of recloser controls that work with most of the popular recloser systems. Whether you use the SEL-651R or SEL-651RA Recloser Controls, or our SEL-351RS Single-Phase Recloser Control, a SEL DNA system will reliably sectionalize and reconfigure the system.
In addition to using feeder relays and recloser controls, DNA systems can incorporate capacitor bank control and monitoring using the SEL-734B Advanced Monitoring and Control Systems, SEL-2431 Voltage Regulator Controls, and SEL2411 Programmable Automation Controllers for motor-operated switch control. Including these devices provides a more capable system.
SEL DNA systems implement pragmatic and effective cybersecurity measures that ensure access for authorized utility engineers while preventing unauthorized access, and fit into a larger NERC CIP compliant system.
Cybersecurity cannot be achieved by one person, product, or technology. Real system-wide protection starts with the understanding that it takes teamwork to achieve success. SEL believes that combining layered security protections with the efforts of protection engineers, information technology (IT) personnel, and compliance engineers leads to a secure and compliant solution. Power engineers demand the most reliable systems and services for their control and protection settings. Settings cannot be disturbed, cables cannot be switched, and significant latency cannot be tolerated. Engineers must have full access to control their equipment 24 hours a day, 365 days a year. SEL cybersecurity implementation in our DNA solutions protects these assets, satisfies IT needs, and assists in NERC CIP compliance while enabling power engineers to work efficiently.