Cost Effective Resilient Time Synchronization for Rural Electric Substation Applications
Faculty Mentor Information
Dr. John Shovic, University of Idaho
Presentation Date
7-15-2026
Abstract
Rural electric substations require Stratum-1, IEEE C37.238-compliant time synchronization to prevent false relay trip conditions, but industrial GPS-disciplined oscillators carry costs that limit deployment at scale. This research evaluates whether commodity Raspberry Pi hardware running Chrony NTP with GPS-PPS discipline can meet substation-grade timing accuracy at a fraction of that cost, as a foundation for a resilient, fault-tolerant timing architecture.
An air-gapped baseline testbed achieved 0.549 µs RMS offset, a 182× margin against the IEEE standard. Extending the testbed onto a Zero Trust network confirmed Stratum-1 compliance under real network routing conditions and ruled out network path as a timing bottleneck across sustained load testing.
The current phase deploys a GPS-disciplined grandmaster clock on Raspberry Pi 5 hardware. Initial convergence testing confirms Stratum-1 lock with sub-100-nanosecond offset stability and reacquisition within seconds of a power cycle. A seven-day continuous holdover characterization is underway to quantify long-duration timing stability under network-connected operating conditions.
These findings establish a low-cost, GPS-disciplined timing baseline; planned work will harden the system against operational anomalies to ensure correct time reporting under fault conditions, extending this architecture toward field-deployable resilience for rural substation applications.
Cost Effective Resilient Time Synchronization for Rural Electric Substation Applications
Rural electric substations require Stratum-1, IEEE C37.238-compliant time synchronization to prevent false relay trip conditions, but industrial GPS-disciplined oscillators carry costs that limit deployment at scale. This research evaluates whether commodity Raspberry Pi hardware running Chrony NTP with GPS-PPS discipline can meet substation-grade timing accuracy at a fraction of that cost, as a foundation for a resilient, fault-tolerant timing architecture.
An air-gapped baseline testbed achieved 0.549 µs RMS offset, a 182× margin against the IEEE standard. Extending the testbed onto a Zero Trust network confirmed Stratum-1 compliance under real network routing conditions and ruled out network path as a timing bottleneck across sustained load testing.
The current phase deploys a GPS-disciplined grandmaster clock on Raspberry Pi 5 hardware. Initial convergence testing confirms Stratum-1 lock with sub-100-nanosecond offset stability and reacquisition within seconds of a power cycle. A seven-day continuous holdover characterization is underway to quantify long-duration timing stability under network-connected operating conditions.
These findings establish a low-cost, GPS-disciplined timing baseline; planned work will harden the system against operational anomalies to ensure correct time reporting under fault conditions, extending this architecture toward field-deployable resilience for rural substation applications.