Recent Trends In Design Of Extra High Voltage Substation

Abstract

With increase in power demand, more generation of power is required. To transmit bulk power, more Extra High Voltage transmission lines and substations are required. Extra High Voltage Substation is an important part of large power system for reliable operation. Reliability, Security and Operational safety are main concerns for the design of Extra High Voltage substations. In this project, Extra High Voltage substation of 400/220/132 kV voltage level is designed with recent technologies. At Extra High Voltage level, higher reliability and protection is a must. In this project work, 400 kV side of substation is designed with One and a half breaker bus scheme. One and a half breaker scheme is more reliable as compared to Two main and a transfer scheme which is used in existing substation and still being used at 400 kV. It has also got an advantage that during maintenance or failure of circuit breaker, supply will not be interrupted. 220 kV is designed with Two main and a transfer bus scheme as in existing scheme. Reliability of this EHV substation is further increased by designing 132 kV side with Double bus single breaker bus scheme against Single bus with sectionalizer as in existing scheme. Substation design drawings are prepared with AutoCAD(2009) software and design calculations are performed. Comparison of proposed and existing substation schemes is done.