Study of Partial Discharges between Plane – Plane/Point Electrode Configurations at Different Gap Lengths
- July 16, 2019
- Posted by: RSIS
- Category: Electrical and Electronics Engineering
International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue VII, July 2019 | ISSN 2321–2705
K.L.Ratnakar, B. Rajesh Kamath
Professors in Electrical and Electronics Engineering, Sri Siddhartha Institute of Technology, Tumkur, Karnataka, India
Abstract: Insulation between the high voltage electrodes employed in circuit breakers, Gas insulated substations plays a important role in the operation of power system. The main cause of failure of an insulation starts from partial discharge and ends up with the breakdown of insulation. Therefore its necessary to make a study of existence of partial discharges and its magnitude and measure the impact on the power system to take the remedial action. The partial discharges exist because of the defects in the insulation media. The local electrical breakdown is also called as partial discharge (PD) which occurs due to high voltage stresses. Due to this continual occurrence of PD leads to breakdown of the system. It’s the high task of the electrical engineers to monitor the PD activity of the high voltage system and take the possible preventive steps. In this paper the experimental results of the PD activity between plane – plane/pointed electrodes with and without spacers have been presented. OMICRON MPD 600 software and hardware setup has been used to capture the 3D histogram files for the evaluation of partial discharges in the system.
Keywords: Surface discharge, Corona discharge, Partial Discharge (PD), Inception Voltage and Extinction Voltage.
I. INTRODUCTION
Transmission of Electric Power at high voltages has gained a considerable prominence in recent years. It is essential to design and develop a compact, cost effective and reliable insulation system. The use of gas insulated transmission and distribution and substation equipments have gained a lot of importance because of its compactness and maintenance free, safe and reliability. All over the world the researchers have identified SF6 gas has better performance at high voltages. But its performance is adversely affected by the presence of foreign particles like metal; voids in the spacers between the electrodes which initiate the partial discharges leading to the catastrophic failure of insulation structure [1-3].
