SWEEP FREQUENCY RESPONSE ANALYSIS FOR ASSESSMENT DEFORMATION CORE AT POWER TRANSFORMER
Asep Saepudin1*, Asep Dharmanto1, Wilarso1, Hilman Sholih1, Umar Tsani Abdurrahman1

Sekolah Tinggi Teknologi Muhammadiyah Cileungsi

Abstract

SFRA (Sweep Frequency Response Analysis) is a transportation test where one of the purposes of this test is to ensure that the core (core) of the power transformer does not shift due to the journey from factory to field. In the SFRA test, it is divided into 4 frequency ranges from 20 Hz to 20 MHz and this research is focused on the frequency range below 2 KHz, based on this diffraction experience to check the transformer core problems and the specific failure of the power transformer core shift. Based on the results of the comparison of the SFRA testing carried out at the power transformer factory during the FAT (Factory Assessment Test) with field testing during the first SAT (Site Assessment Test) and with the second SAT testing, there are differences in the frequency area below 2 KHz, this shows that there are problems in the region. power transformer core, before drawing a final conclusion that there is a problem or deformation of the transformer core, you must see the results of other tests carried out in the field such as ratio test, winding resistance test, tangent delta test, current excitation test, insulation resistance (megger test) winding and core-frame as well as impact recorder data during the journey from factory to field. If all other field testing results are good, the power transformer is still in good condition and ready to operate and there is a graphic difference at a frequency of less than 2 KHz in the SFRA test during SAT compared to when FAT is most likely due to residual magnetism that is still on the core side due to DC testing before or Residual magnets can occur due to the process of electrostatic phenomena due to the oil purification process or due to the induction effect of the network grounding system where the power transformer is placed

Keywords: SFRA, FAT, SAT, Residual magnet, Induction

Topic: Engineering and Technology