Performance of 420 kV Instrument Transformers under Earthquake

Seismic performance of substation equipment during past earthquakes is poor. In addition, requirement electric power post-earthquake led to an increased focus on the earthquake survivability equipment. Equipment installed in vulnerable by virtue its geometry and configuration. Interconnection between further aggravates problem. Failure results financial loss considerable time required repair/replace restore supply. Earthquake vibration level can be evaluated based site/location but predicting occurrence not possible. High voltage shall designed for seismic loading. Foundation, anchoring, installation interconnection also need engineered according load location qualification various as per National International standard performed using tri-axial shake table facility Engineering Vibration Research Centre. Performance 420kV instrument transformers under environment presented this paper.