EVALUATION AND IMPROVEMENT OF CONTROL AND PROTECTION SYSTEM FOR 110KV SAM SON 1 SUBSTATION

Abstract

This paper presents a comprehensive assessment of the current status and proposes technical solutions to enhance the control and protection system of the 110kV Sam Son 1 substation, located in Thanh Hoa province, Vietnam. Through on-site inspections and operational data analysis, several major limitations were identified, including incomplete SCADA signal acquisition, non-uniformity in protection relays, and the lack of standardized communication protocols such as IEC 61850. To overcome these issues, the study recommends an integrated modernization approach involving SCADA system expansion, deployment of IEC 61850-compliant digital relays, standardization of the substation communication network, and implementation of GPS-based time synchronization and remote control capabilities. The proposed solutions were quantitatively evaluated, showing a substantial improvement: relay response time was reduced from 250 ms to 85 ms, while SCADA signal coverage increased from 65% to 98%, thus meeting the technical criteria for unmanned substation operation. This research contributes a practical reference model for upgrading 110kV substations towards smart grid development and digital transformation