Resilient and reliable solutions to reduce outages
Distribution Automation (DA) – often described as a "self-healing grid" – is technology that provides real-time monitoring and control of our distribution circuits to help us detect outages more quickly and address them faster and more effectively. While not all power interruptions can be immediately healed, per se, DA does give us a way to greatly reduce their impact on our system and for customers. It also that means PSE doesn't have to dispatch personnel nearly as often to inspect lines and locate problems.
How it works
When a power outage occurs in a DA-enabled area, the system can pinpoint the source of the problem, isolate the fault to the smallest section possible, and restore power to un-faulted sections. Given the prevalence of falling limbs and trees throughout our service area, DA offers a tangible, measurable benefit for our customers.
Here's a basic description of the process:
The location of a fault (outage) is determined based on sensors on the electric system. Once detected, DA technology uses a series of "reclosers" to automatically operate switches on both sides of the faulted equipment to isolate it from the rest of the system. This feature also can help electric crews locate the trouble spots more quickly – or even eliminate the need for a physical inspection. After the fault has been isolated, the DA system re-energizes the un-faulted sections using power from neighboring electrical lines.
How we're deploying it
Eventually, DA technology will be utilized broadly across our service area. For now, we're concentrating our installation efforts on circuits that have, historically, suffered the highest number of outages (e.g., Kenmore, Chico, and Fernwood). Since 2016, PSE has completed work on 90 circuits, more than doubling the number of completed projects from year to year. In highly populated, urban areas, we've seen this technology protect our customers from over 170 hours of outages.