Model of substation economic evaluation based on LCC theory

LIU Tian1， CHEN Guang1， DAI Pan1， LI Long2， SUN Ke3， ZHOU Hao1
（1. College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China；
2. Jinan Municipal Electrical Power Company， Jinan 250012， China；
3. Zhejiang Electric Power Corporation， Hangzhou 310007， China）

Abstract： Aiming at the problems of making scientific and rational decisions in the selection of high voltage electrical switchgear in the substation's design and renovation process，a model of substation economic evaluation based on the assets life cycle cost（LCC）theory was proposed. Annual value was used in the economic evaluation process regarding the difference in life cycles and sensitivity analysis was made on the most significant factors. Taking the 500 kV substations for instance，the LCC annual value of gas insulated switchgear（GIS）substation and air insulated switchgear（AIS）substation were calculated. Based on the calculation results，economic evaluation on GIS substation and AIS substation was made accordingly. Then，sensitivity analysis was made on the most significant factors，land price and the equipment price. The results indicate that AIS substation is more economical in remote areas under the current situation. Meanwhile，as the price of GIS equipments decreases or the price of land increases，GIS is highly cost efficient and more economical in urban substations.
Key words： substation；high voltage electrical switchgear；life cycle cost（LCC）；model of economic evaluation；gas insulated switchgear（GIS）；air insulated switchgear（AIS）