Partial discharge PD measurements

partial discharge measurements have become a well-established method for type and routine testing as a non-destructive material test and quality control [23], [26], [53]. Apart from optical and acoustical detection methods of partial discharges, the high frequency detection and measuring method preferably covers a wide range of applications. It will be considered in more detail in the following. 

The basic principle of partial discharge measurement may be explained with a rather simple model (Fig. 8.4). A coaxial cable with an intact dielectric 

With increasing U, the partial discharge in Cl is ignited, showing a constant low voltage on Cl. As a model, a switch S across Cl may be closed. So, the total capacitance of the cable is  

1 Broadband equipment lower frequency limit upper frequency limit bandwidth 

2 Narrow band equipment frequency range bandwidth 

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Partial discharge (PD) measurements applied to components or apparatus subject to electrical stresses, e.g. components according to encapsulation - m or complying with increased safety - e - ... 

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