www.megger.comMPAC – Professional Accoustic Imaging Camera4A key part of an acoustic imager is an array of microphones. The Megger acoustic imaging cameras have 128 microphones. The microphones pick up audible and ultrasonic sounds from a gas leak or partial discharge, using signal processing to suppress unwanted sounds so that the imager responds only to sounds from the fault.Additional processing of the signals from the microphone array allows the instrument to determine the fault’s precise direction and the fault’s approximate physical size. This information is used to produce a coloured ‘map’ representing the fault, which is displayed on top of an ordinary digital image of the equipment that the acoustic imager is being used to examine. Colours are used to show the varying sound pressure or ‘volume’.This method of detecting and locating faults has several advantages, the most important of which is that it involves no contact with the equipment or installation being examined. In fact, with the Megger equipment, faults can be detected at distances of up to 120 m. This has important safety implications. When inspecting overhead power lines for possible PD, for example, there is no requirement for working at height and no need to approach energised conductors. Remote fault detection also saves time; a large section of plant can be surveyed for leaks in just a few minutes, whereas manual inspection to find leaks could take hours.
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