Underground Transformer Hazard Mitigation Case – Elbow Connector Risk Averted

Customer

Duke Energy

Location

Matthews, NC

Highlights

  • Arc Flash Risk Prevented by Fast, Safe Action
  • Procedural Weakness Prompted Immediate Review
  • Zero Downtime and Reinforced Safety Protocols

Unsecured Elbow Found During UG Transformer Inspection

The Challenge

During a routine service call for a "no power to meter" issue, a lineman discovered that the underground transformer was not energized. As part of his diagnostic process, the lineman inspected nearby transformers and identified the root cause: an elbow connector had backed off the primary bushing and was floating loose inside the transformer. This posed a significant risk of arc flash or electrocution had the component become live during inspection. Although no incident occurred, the situation exposed a critical weakness in elbow installation procedures and inspection protocols.

The Solution

The lineman immediately contacted the Distribution Control Center (DCC), secured the proper equipment, and used a shotgun stick to safely reseat the elbow onto the primary bushing. Fortunately, the event concluded without injury or service delay.

Key Benefits

  • Incident Avoided Through Proper Procedure: The lineman used proper tools and safety procedures to prevent escalation.
  • Hazard Identification Improved: The discovery prompted a review of recent installations and emphasized the need for final connection checks.
  • Client Continuity Maintained: The issue was resolved with minimal downtime for the customer.

The Results

  • Risk Contained: No injuries or equipment damage occurred.
  • Lessons Captured: The event prompted reminders to crews to double-check elbow seating and to avoid overusing silicone, which may impair proper contact.
  • PPE Reinforcement: The importance of wearing full PPE during UG transformer access was reiterated across teams.

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