Novel ideas for conventional AIS space saving to compare with other compact solutions in Tehran Regional Electric Company

Construction of sub-transmission substations in congested urban areas with dense population distribution has always been a challenging problem, thus reduction of substation footprint is a demanding need that has been considered in many countries. For responding this need, so far various techniques such as Hybrid solutions, Gas Insulated Switchgear and innovative Air Insulated Switchgear such as disconnecting circuit breaker (DCB) have been used. Although, these new technologies are responsible for this issue, but in many countries using conventional substations based on Air Insulated Switchgear have been preferred yet. In this paper a new solution to implement compact conventional AIS substations (CCAIS) is proposed. This solution is based on optimizing clearances within standard range, changing of equipment arrangement, indoor and two floor design and using a common foundation for several equipments. The CCAIS solution is proposed to Tehran Regional Electric Company (TREC) in Iran. Then we developed an algorithm based on multi-attribute decision making in MATLAB for comparing the proposed solution with other technologies to select optimal solution. The results which consist of ranking of alternatives and also sensitivity analysis on land cost parameter are illustrated in this paper.