Acoustic Imaging
Electrical Discharge Detection & Assessment
Acoustic imaging provides a non-contact method of detecting and locating electrical discharge activity in energized electrical equipment. Using specialized ultrasonic imaging equipment, RATTLIR identifies acoustic signatures associated with partial discharge, including corona, surface discharge and floating discharge.
Electrical discharge activity can occur without visible damage or abnormal heating, making it difficult to identify through conventional visual and thermal inspections alone.
RATTLIR incorporates acoustic imaging into comprehensive switchyard assessments to identify potential insulation and electrical connection concerns. Findings are evaluated based on the observed discharge characteristics, equipment involved, and operating conditions to help determine the need for further investigation or planned maintenance.
Understanding Electrical Discharge
Partial discharge can occur in several forms, including corona around energized components, surface and internal discharge along insulating materials, and floating discharge associated with electrically isolated conductive hardware.
Acoustic imaging allows RATTLIR to detect and locate ultrasonic signatures associated with these conditions. Each finding is evaluated based on the discharge characteristics, equipment involved, and potential impact on equipment reliability.
The following examples illustrate different types of electrical discharge identified during RATTLIR inspections, along with their associated acoustic signatures.
Corona Discharge
Corona occurs when the electrical field surrounding an energized conductor or component becomes strong enough to ionize the surrounding air. It is commonly associated with sharp edges, damaged conductors, and hardware where electrical stress is concentrated.
Sustained corona activity can contribute to insulation deterioration and damage to nearby components.
Surface and Internal Discharge
Surface discharge occurs along the surface of an insulating material, often where moisture, contamination, or deterioration reduces its insulating properties.
Internal Discharge occurs within the insulation itself, typically in voids or areas where the insulating material has deterioriated.
Both conditions can contribute to progressive insulation damage and, if left unaddressed, may lead to insulation failure.
Discuss Your Acoustic Inspection Needs
Whether you're planning a comprehensive switchyard assessment or investigating suspected electrical discharge activity, RATTLIR can develop an inspection scope tailored to your facility and operating conditions.
Contact RATTLIR to Discuss and Inspection.
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