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Research Article

JCR. 2020; 7(14): 3379-3392


INTELLIGENT TECHNIQUES FOR MITIGATION OF TRANSIENT OVER-VOLTAGES IN GAS INSULATED SUB-STATION AND EFFECTS OF VFTO.

Sasanka Sekhor Sharma, R.R.Joshi, Raunak Jangid3, Shripati Vyas.

Abstract
Gas Insulated Substations (GIS)are being used very much due to their numerous advantages such as the versatility of prevention from pollution, compact size, less maintenance, high reliability etc.Apart from all these advantages, there is a also a particular problem ofrise of very fast transient over-voltage (VFTO) at the time ofswitching breaker or disconnector and due to line to ground faults .VFTOs rise time is very short ranging from 5 to 100 ns which is followed by high frequency oscillations ranging from 100 KHz to 100 MHz and further, this voltage being a travelling wave gets reflected at open ends and thereby multiplied. More than hundreds of strikes or pre strikes may initiateinto opening orclosing of a 400mS cycle. 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 Damping Resistance, Ferrite Rings etc. have been studied by MATLAB Software.VFTO effect on GIS such as stress on substation Transformer leading to winding deformation has been discussed in this paper. Localization of deformation in transformer winding is also carried out using intelligent classifier.

Key words: Switching Transients, Gas Insulated Substation, Very Fast Transient Over-voltage, Winding Deformation.



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