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Comparison of The Characteristics and Mechanism of Surface Discharge Occurence on The Acrylic Surface in Air and Oil Insulation With Circular Plane-Plane Electrodes

The existence of partial discharge (PD) in an electrical component is something that is feared. But this partial discharge is also an advantage because it is a sign of initial damage to an insulation before it become breakdown. The characteristics of PD that arise can be a measure of the amount of damage that occurs even can determine the location of the PD itself in some cases. Therefore, it is very important to know the characteristics and categories of PD that occur in an insulation so we can take some precautionary step to prevent the damage from getting worse. Surface discharge is one type of partial discharge that has a medium level of damage to the insulation. It is below internal PD (void), and above corona PD. This surface discharge cannot occur if only using one type of insulation. It takes two types of insulation that have different permittivity, so that there is a difference in ionizing voltage between the two types of insulation used. In this experiment, the properties of surface PD that arise on an object of solid insulation in air and in liquid insulation in the form of mineral oil are being analyze and compared. The experimental standard used is the IEC 60270 as a PD experimental standard that are often used for. The PD detection sensor used is a detecting impedance (RC) sensor to detecting the surface PD that occurs and measure the characteristics of it. As an electric field generator used is a circular plane-plane electrode to produce a homogeneous electric field. From the experiments it was found that PD properties between surface PD in air and in oil no too different in its respond to increase of voltage source. But the phase patterns show that the mechanism of surface discharge that occurs in the object has different progress in how it is can be happen.