REDwire How to decrease the chance of a premature failure in your insulation system

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Megger's Ultrasonic Leak and Corona Detector is a low-cost, portable system that receives airborne ultrasonic signals.

Partial discharges occur when minor defects are present in electrical insulation systems. When partial discharges occur repetitively in solid insulation material, the destructive energy released deteriorates the material at that site. Over time, this deterioration spreads and can completely penetrate the insulation material, creating a total breakdown.

Premature failure of insulation systems has been attributed to the action of partial discharges. For this reason, testing for partial discharges in an insulation system has been adopted as a quality control measure for applications where high reliability is a concern. 

The requirement for partial-discharge testing is found in power delivery products such as power cable, terminations and joints; generators and motors; bushings; circuit breakers and switchgear; instrument transformers (CTs and PTs); capacitors; transformers (power and epoxy cast coil); and lightning arresters and fuses.

In addition, electronic devices found in aerospace and defence applications have thin insulation systems that are subject to high stress and harsh operating environments. 

Partial-discharge testing helps ensure components, such as rectifiers, connectors, wiring harnesses, test capacitors, diodes, transformers and DC power supplies, operate reliably.

Megger, a Markham, Ont.-based company that designs and manufactures portable electrical test equipment, has a full lineup of products for industrial and facility maintenance, including leak and corona detectors.   

The company’s Ultrasonic Leak and Corona Detector is a low-cost, portable system that receives airborne ultrasonic signals, converts them to the audible range, amplifies them and displays the output visibly on a meter and audibly through a speaker or headset. The system is designed for locating gas leaks and electrical corona sources, all of which emit strong ultrasonic signals that are inaudible to the unaided human ear. 

Megger applications engineers are very experienced in solving test and measurement problems in industrial processes. Contact the company for more information on its products and services. 

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Megger Limited

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