Partial Discharge Pattern Detected by New Design Partial Discharge Sensors

This research discusses the design and testing of the bowtie antenna as a partial discharge sensor (PD). In this design, there are three types of bowtie antennas which are simulated with high frequency structure simulator (HFSS) software with various shapes and sizes, namely double layer bowtie antenna with edge modification, doube layer bowtie antenna with middle slice modification and single layer bowtie antenna with edge modification. The three bowtie antennas are designed to get the frequency of response according to the frequency of PD appearance. The three of bowtie antenna is designed with FR4_epoxy substrate which has dimensions of length and width of the substrate is 160 mm and 54 mm, thickness of 1.6 mm which then process the bowtie antenna will be implemented on printed cicuit board (PCB) material. Antenna characteristics which include return loss (RL), bandwidth and voltage standing wave ratio (VSWR) will be seen from the results based on simulation and measurement results using a vector network analyzer (VNA). Testing of the three bowtie antennas is done using needle-plane electrodes. Then the antenna is connected to the oscilloscope so that the signal captured by the antenna can be detected. The measurement of the three bowtie antennas was carried out at three voltage levels namely 6 kV, 6.5 kV and 7 kV. So, it can be known the PD pattern detected by new design antenna as PD sensor. It can also be known sensitivity of the three antennas as the best in detecting PD signals on each antenna with increasing voltage levels that have been determined and reviewed from the side of the antenna characteristic parameters obtained based on the simulation results and antenna measurement results using VNA.