This test replicates the factory test performed on the new cable. Very low frequency vlf withstand testing is the application of an ac sinusoidal waveform generally at 0 01 0 1 hz to assess the quality of electrical insulation in high capacitive loads such as cables. The ideal test would be a frequency 50hz 60hz test but the test equipment is size and weight restrictive especially on long lengths of cable because of the charging current required.
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