Is your underground system prepared for the unexpected?
Undergrounding residential distribution circuits improves grid resilience and reliability in the face of increasingly severe weather.
But underground lines are not immune to permanent faults or a loss of source. The result: prolonged customer outages that require multiple truck rolls to investigate the issue and restore power.
The EdgeRestore Underground Distribution Restoration System brings automatic restoration capabilities to underground single-phase residential transformers.
When deployed across transformers on a looped circuit, the system detects cable faults and loss-of-source events, then reconfigures the circuit to restore service. More customers stay online, and crews can work more safely and efficiently.
How Automatic Outage Restoration Works
Watch how the EdgeRestore system isolates faults and restores power from an alternative source in less than 60 seconds through intelligent switching operations.
Why Utilities Choose the EdgeRestore System to Enhance Resilience
Protects Reliability
Reduces outage minutes and helps keep more of your customers online.
Improves Operations
Automates FLISR, reducing fault-finding time and crew exposure to medium voltage.
Deploys Quickly
Installs fast and integrates into protection schemes without changes to curves.
Explore the advantages of self-healing technology for underground lateral loop circuits.
Learn MoreSee the EdgeRestore System in Action on Single-Phase URD Lateral Loops
Watch how the EdgeRestore system automatically restores power to customers when various problems occur on an underground residential distribution circuit.
View the EdgeRestore System Construction and Design
Explore key components using the 3D product viewer below. For instructions, click the Help button.
Features that Deliver Automatic Fault Detection, Isolation, and Restoration
Automated Switching
Bushing-well interrupters and the EdgeRestore control enable fault detection, isolation, and switching for power restoration.
Loadbreak Switching Levers
Levers allow crews to manually open or close interrupters, eliminating need to pull energized elbows.
Visual Status Indicators
Semaphore colors on bushing-well interrupters show open and close states, indicating the direction of the fault.
Transformer-Compatible Design
Fits into new or existing ANSI Type 1 and Type 2 transformers for easy installation.
Pre-Configured Controls
Does not require onsite software programming, settings management, or firmware updates for quick deployment.
Current Sensing
Continuously monitors primary current, signaling the EdgeRestore control if a cable fault occurs.
Peer-to-Peer Communications
Uses power line carrier communication between EdgeRestore systems for automatic restoration and return to normal operations.
LED Voltage Indicators
LEDs on the EdgeRestore control signal to crews whether voltage is detected.
Cross-Phase Detection
Closing operation uses a phase-angle voltmeter before closing to avoid cross-phasing.
Stay in the Loop with 24/7 Monitoring
Add Ubicquia’s UbiGrid® Distribution Transformer Monitor (DTM+) sensing and communications package to the EdgeRestore system for 24/7 device monitoring, enhanced situational awareness, and improved fault responses.
Take a Closer LookNeed Support?
S&C is here to help you through any stage in your grid-modernization journey, from system studies to 24/7 support. Explore more below.
Product Details
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Table 1. EdgeRestore Underground Distribution Restoration System Control
| Control Type | Programming* |
|---|---|
| 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 |
