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Local defect when measuring dissipation factor
For assessing the dissipation factor (tg d) only the absolute measured value is often used. But if it is possible to divide the measured object in more parts (in practice it is almost always possible, except for measuring liquid dielectric) the result may be incorrect. The text shows an example of a dielectric internally divided into two parts. In so defined circuit the measured value does not have to correspond with the actual state of dielectric, but is given by plain ratio of capacities of these two parts. The capacity ratio of the damaged and undamaged parts limits also the maximum possible measured value. The mentioned ratios are evident in the graphs.
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