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Acoustic Insulation Analyzer

Check your gas-insulated substations (GIS) without disturbing normal service operation.

The Acoustic Insulation Analyzer (AIA) gives you a unique opportunity to detect, locate, and identify most common defects in GIS, such as particles and partial discharges. Produced by Doble's TransiNor office, the AIA has unique sensitivity that enables you to classify whether a flaw is harmful or not. The acoustic technique used in AIA is widely known and accepted as a diagnostic tool for GIS, according to "Insulation Co-ordination of GIS: Return of Experience, On-site Tests and Diagnostic Techniques” (Electra 176, February 1998)

Features and Benefits

• Efficient as part of a regular maintenance program, for cost savings and increased reliability of the GIS
• Portable, battery-powered, and easy to use via menu-controlled software
• Detects particles and protrusions as small as 2 mm in-service, whereas 5 mm particles are detectable by conventional methods in the laboratory.
  

Applications

• Determine whether a flaw is present in the insulation of GIS system, such as bouncing particles or partial discharges from protrusions and/or loose shields.
• Perform condition-based monitoring of GIS during commissioning and in service.
• Use for design and factory tests during manufacturing.

AIA offers three measuring modes: continuous, pulse and phase.

Continuous mode provides:

• RMS signal during one power cycle
• Peak signal during one power cycle
• Degree of modulation with the power cycle
• Degree of modulation with twice the power cycle

Continuous mode gives initial information about the signal, indicating the type of flaw. 50 Hz (Frequency 1) or 100 Hz (Frequency 2) content suggests that a partial discharge is present. A fluctuating peak signal suggests that one or more particles are present.

Pulse mode provides:

• Peak value of impulse signal
• Time since last pulse
  

Both are plotted in an elevation time vs. amplitude plot.

Phase mode provides phase angle of pulse occurrence.

Using AIA to measure in GIS is easy. A cable connects the sensor to the front plug of the instrument, and may be held by hand or mounted to the GIS by a flexible band. Locate defects by moving the sensor to the place where the signal level is highest.