Mitigation of transient over-voltages with intelligent optimization technique and VFTO effects on gas insulated sub-station

• Main Authors: Sharma, Sasanka Sekhor, Vyas, Shripati, Vyas, Megha, Kumar, Sujit
• Format: Conference Proceeding
• Language: English
• Subjects: Circuit breakers; Controllability; Damping; Deformation; Earth faults; Insulation; Optimization; Optimization techniques; RC circuits; Substations; Switching; Transformers; Waveforms; Winding
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0207525

Generation of very fast transient over voltages (VFTOs) is very common during switching operations in gas insulated substations (GIS) and it is extremely harmful for substation equipment like transformers as it becomes a reason of insulation damage due to its less arising time. Sometimes, the VFTOs magnitude may be very near to the basic insulation level (BIL). Improvement and investigation of such transients in power transformer is of crucial importance in GIS as transformers are vital components of power system network. Generation of transient issues considers the generation and propagation of VFTOs while switching of circuit breakers or disconnector switches or earth faults. In this research, the investigation is on VFTO by putting intelligible models for a GIS of a capacity 400 KV. This paper presents a modeling guideline for VFTO analysis in GIS and, further mitigation techniques such as Nano-crystalline Rings, RC Filter, Ferrite Rings, Damping Resistance etc. have been studied using MATLAB simulation. Using an intelligent optimization technique like PSO, VFTO waveforms can be scaled down further to controllable limits so that substation components can be saved from impending failures. Further VFTO effect on GIS such as stress on substation Transformer leading to winding deformation has been discussed in this paper and localization of deformation and type of deformation in transformer winding is also carried out using intelligent classifier.