Utilities are responding to increasingly severe weather by taking proactive steps to improve grid reliability and resilience. Undergrounding residential lateral lines is a key grid-hardening strategy that limits storm exposure and minimizes the frequency of transient faults.
When a fault occurs on an underground residential distribution circuit, it always results in a permanent outage. Often, the issue takes hours to repair and requires multiple truck rolls—leaving dozens of customers without power for an extended period of time.
S&C’s EdgeRestore Underground Distribution Restoration System is an automated solution that boosts customer reliability, enhances crew safety, and seamlessly fits into your existing system.
The EdgeRestore system keeps the power on for customers when a fault occurs, eliminating an emergency truck roll and allowing crews to quickly locate the fault for repair.
Fits into existing protection philosophies with no changes to protection settings or curves.
Eliminates the need to pull energized elbows.
Automatic fault isolation
No more need for trial-and-error fault-hunting to isolate faults.
Simple communications setup requires zero onsite programming.
Closing operation uses a phase-angle voltmeter before closing to avoid cross-phasing.
Voltage indications without testing cables
Control lights show line crews whether voltage is detected.
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Table 1. EdgeRestore Underground Distribution Restoration System Control
|Normally closed (NC)||Two recloses, open transition|
|Normally open (NO)||Two recloses, open transition|
* Programming includes the number of recloses the control will operate after (two) and the return-to-normal transition (open).
Table 2. EdgeRestore Bushing Well Interrupters (50/60-Hz Ratings)
|Nom. Voltage||Maximum Voltage (Single Phase to Ground)||BIL Voltage, Line to Ground||Cont. Current||Short-Circuit, Sym. Current||Bushing Well Configuration|
|15 and 25 kV||15.2 kV||125 kV||80 amp||6300 amp||H1A|
|15 and 25 kV||15.2 kV||125 kV||80 amp||6300 amp||H1B|