Detection of partial discharges (Corona) in electrical apparatus

Preliminary Experimental Work on Nanocomposite Polymers: Small Partial Discharges at Inception Voltage, The Existence of Possible Charging Mechanisms Below Inception Voltage and the Problem of Definitions

“…This may be due to the nature of nanomaterials. The very structure of them, ie the existence of interfacial regions and the close packing between nanoparticles and matrix may not allow phenomena, such as those described in [8,9,11,19] to take place.…”

“…It is well known that partial discharges consist a danger to the insulating materials in general. They degrade their performance and they lead on many occasions to their ultimate failure [6][7][8]. Although a great number of people performed research on PD, their mechanisms, the parameters that influence them and their effect on insulting materials, relatively little is known on the possible effects of charging phenomena below the inception voltage.…”

Comparative Analysis of Thermography Studies and Electrical Measurement of Partial Discharges in Underground Power Cables

“…The PD type depends on the defective localization, and it could be either internal or on the surface. Figure 1 shows the electrical model for (a) a PD on internal defect insulation and (b) a PD on the insulation surface [6].…”

Instrumentation System for Location of Partial Discharges Using Acoustic Detection With Piezoelectric Transducers and Optical Fiber Sensors

“…), acoustic detection has major advantages regarding electromagnetic interference immunity, it provides information for locating the source of acoustic emission (AE) and it is easy to install in f eld [1]- [3]. Most acoustic detection systems are focused on corona PD [4], [5]; these discharges are of higher intensity and they have a high signal to noise ratio. However, the internal PD and surface PD are less intense and their detection is greatly affected by the noise level.…”