Some technical developments come about by chance, some by adaption of existing applications, and some from necessity. Very Low Frequency technology was a deliberate engineering development effort to solve a problem: field testing high capacitance loads with AC voltage. Its introduction goes back to the early 60's, first used for testing motors and generators by GE, ASEA, and others. For that application, use was and is seldom. Then, wishing to abandon the traditional DC voltage cable testing methods, the need came about for testing medium voltage cables with something else: that something else was VLF AC technology. Obviously there was widespread application for cable testing that drove VLF development and use to the mainstream technology that it is today. Let's take a brief look at a little history and how the VLF technology is used today.
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