VLF TEST SYSTEM Operating manual
■Based on comprehensive scientific research, relevant DIN and VDE standards which we recommend to your attention, and more than 10 years of practical experience on more than 300 VLF Test Systems, we can today take it for granted that the 0.1 Hz VLF method for testing cables with plastics insulation outclasses any other test method using DC voltage or power-frequency AC voltage as used so far.
●A 0.1 Hz VLF Test System is required to meet the following demands:
■The repetition rate has to be so slow, that the power set free in any partial discharge (PD) channel that may already exist is small enough not to cause further erosion and so increase gas pressure.
■The inversion of polarity, on the one hand, must be slow enough to exclude any transients caused by travelling waves. On the other, it must be fast enough that any space charge at the tip of a PD channel from where it grows in the direction of the opposite electrode is preserved.
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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03/2014 |
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Issue: 06 |
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128312966 |
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1.6 MB |
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